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WO2012026064A1 - Circuit de détection, module de batterie, système de batterie, véhicule électrique, corps mobile, dispositif de stockage électrique, et dispositif d'alimentation électrique - Google Patents

Circuit de détection, module de batterie, système de batterie, véhicule électrique, corps mobile, dispositif de stockage électrique, et dispositif d'alimentation électrique Download PDF

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Publication number
WO2012026064A1
WO2012026064A1 PCT/JP2011/004060 JP2011004060W WO2012026064A1 WO 2012026064 A1 WO2012026064 A1 WO 2012026064A1 JP 2011004060 W JP2011004060 W JP 2011004060W WO 2012026064 A1 WO2012026064 A1 WO 2012026064A1
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WO
WIPO (PCT)
Prior art keywords
voltage
battery
battery module
detection circuit
analog
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2011/004060
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English (en)
Japanese (ja)
Inventor
計美 大倉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
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Filing date
Publication date
Application filed by Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Publication of WO2012026064A1 publication Critical patent/WO2012026064A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/14—Preventing excessive discharging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/15—Preventing overcharging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/005—Testing of electric installations on transport means
    • G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the present invention relates to a detection circuit and a battery module, a battery system, an electric vehicle, a moving body, a power storage device, and a power supply device including the detection circuit.
  • a chargeable / dischargeable battery module is used as a drive source for a moving body such as an electric vehicle.
  • a battery module has a configuration in which, for example, a plurality of batteries (battery cells) are connected in series.
  • the battery module is provided with a voltage detection circuit that measures the voltage of each battery cell.
  • the battery module is provided with a current detection circuit that measures the current flowing through the battery module.
  • a current detection circuit capable of measuring the current flowing in both directions.
  • a shunt resistor is connected to a charge / discharge circuit connected to a secondary battery.
  • a polarity inversion circuit is interposed between the charge / discharge circuit and the measurement circuit.
  • the input side of the isolation amplifier is connected to a measurement circuit, and the output side is connected to a voltage measuring device.
  • the arithmetic unit is connected to the output side of the voltage measuring device.
  • the polarity inversion circuit is switched via the control device by an external command from the charge / discharge switching device.
  • the current in the different direction flowing in the charge / discharge circuit is unified in either the positive or negative direction by polarity reversal and measured in a state converted to voltage. Input to the circuit.
  • the input voltage of the measurement circuit is insulated and converted into a predetermined measurement range by an insulation amplifier and measured by a voltage measuring device. Moreover, the voltage measurement value of a voltage measuring device is converted into an absolute current value by an arithmetic unit. At this time, the absolute value of the current is switched between the positive direction and the negative direction according to the charging and discharging conditions under the control of the control device.
  • JP-A-8-17478 JP-A-8-17478
  • An object of the present invention is to provide a detection circuit, a battery module, a battery system, an electric vehicle, and a moving body that can detect a terminal voltage of each battery cell and a current flowing through the battery module while suppressing an increase in circuit scale and cost. It is to provide a power storage device and a power supply device.
  • a detection circuit is a detection circuit connected to a plurality of battery cells and an element that generates a voltage corresponding to a current flowing through the plurality of battery cells, and is a unipolar that converts a voltage into a digital value
  • An analog-to-digital converter, and an input processing unit that selectively inputs the voltage of each battery cell and the voltage generated in the element to the analog-to-digital converter, and the input processing unit has a negative voltage generated in the element. In some cases, a negative voltage is converted to a positive voltage and input to an analog-digital converter.
  • the terminal voltage of each battery cell and the current flowing through the battery module can be detected while suppressing an increase in circuit scale and cost.
  • FIG. 1 is a block diagram showing the configuration of the detection circuit of FIG.
  • FIG. 2 is a block diagram showing a configuration of a detection circuit according to the third embodiment.
  • FIG. 3 is a block diagram showing the configuration of the detection unit of the detection circuit according to the fourth embodiment.
  • FIG. 4 is a block diagram showing the configuration of the detection unit of the detection circuit according to the fifth embodiment.
  • FIG. 5 is a block diagram illustrating a configuration of a detection unit of a detection circuit according to the sixth embodiment.
  • FIG. 6 is a block diagram showing the configuration of the detection unit of the detection circuit according to the seventh embodiment.
  • FIG. 7 is a circuit diagram showing an example of the configuration of the offset unit.
  • FIG. 8 is a block diagram showing the configuration of the detection unit of the detection circuit according to the eighth embodiment.
  • FIG. 1 is a block diagram showing the configuration of the detection circuit of FIG.
  • FIG. 2 is a block diagram showing a configuration of a detection circuit according to the third embodiment.
  • FIG. 3 is
  • FIG. 9 is a circuit diagram showing an example of the configuration of the rectifying unit.
  • FIG. 10 is a circuit diagram illustrating another example of the configuration of the rectifying unit.
  • FIG. 11 is an external perspective view of the battery module.
  • FIG. 12 is a plan view of the battery module.
  • FIG. 13 is a side view of the battery module.
  • FIG. 14 is an external perspective view of the bus bar.
  • FIG. 15 is an external perspective view showing a state where a plurality of bus bars and a plurality of PTC elements are attached to the FPC board.
  • FIG. 16 is a schematic plan view for explaining the connection between the bus bar and the detection circuit.
  • FIG. 17 is an external perspective view showing the configuration of the battery module according to the first modification.
  • FIG. 18 is an exploded perspective view showing a configuration of a battery module according to a second modification.
  • FIG. 19 is a perspective view of the lid member of FIG. 18 as viewed obliquely from below.
  • FIG. 20 is a perspective view of the lid member of FIG. 18 as viewed obliquely from above.
  • FIG. 21 is a view of a plurality of bus bars and two FPC boards in the second modification as viewed from above.
  • FIG. 22 is a view of the printed circuit board according to the second modification as viewed from above.
  • FIG. 23 is a schematic cross-sectional view showing a connection structure between an FPC board and a printed circuit board in a second modification.
  • FIG. 24 is an exploded perspective view showing a configuration of a battery module according to a third modification.
  • FIG. 19 is a perspective view of the lid member of FIG. 18 as viewed obliquely from below.
  • FIG. 20 is a perspective view of the lid member of FIG. 18 as viewed
  • FIG. 25 is a perspective view of the lid member of FIG. 24 viewed obliquely from below.
  • FIG. 26 is a perspective view of the lid member of FIG. 24 as viewed obliquely from above.
  • FIG. 27 is a block diagram showing electrical connection of main parts of the battery system.
  • FIG. 28 is a schematic plan view showing a first example of the arrangement of the battery system.
  • FIG. 29 is a schematic plan view showing a second example of the arrangement of the battery system.
  • FIG. 30 is a block diagram illustrating a configuration of an electric vehicle including a battery system.
  • FIG. 31 is a block diagram illustrating a configuration of a power supply device including a battery system.
  • a detection circuit is a detection circuit connected to a plurality of battery cells and an element that generates a voltage corresponding to a current flowing through the plurality of battery cells, and converts the voltage into a digital value.
  • a unipolar analog-to-digital converter and an input processing unit that selectively inputs the voltage of each battery cell and the voltage generated in the element to the analog-to-digital converter.
  • the input processing unit has a negative voltage generated in the element. The negative voltage is converted into a positive voltage and input to the analog-digital converter.
  • the voltage of each battery cell and the voltage generated in the element are selectively input to the analog / digital converter and converted into a digital value by the analog / digital converter. In this way, the voltage of each battery cell and the voltage generated in the element can be converted into a digital value using a common analog-digital converter.
  • the input processing unit converts the negative voltage into a positive voltage and inputs it to the analog-digital converter. Since the voltage generated in the element is proportional to the current flowing in the plurality of battery cells, the current flowing in the plurality of battery cells can be calculated based on the voltage generated in the element. Therefore, it is possible to detect the current flowing through the plurality of battery cells using the unipolar analog-digital converter when charging and discharging the plurality of battery cells.
  • the input processing unit converts the negative voltage to a positive voltage by inverting the polarity of the negative voltage, and the converted positive voltage is converted from analog to digital.
  • the digital value converted by the analog-digital converter may be given a negative sign.
  • the voltage generated in the element is a negative voltage
  • the negative voltage is inverted into a positive voltage by reversing the polarity of the negative voltage.
  • produces in an element can be detected using a unipolar analog-digital converter.
  • a negative sign is given to the digital value converted by the analog-digital converter.
  • the voltage generated in the element can be detected as a negative voltage. Therefore, it is possible to detect the direction of the current flowing through the plurality of battery cells.
  • the input processing unit converts the voltage generated in the element into a positive voltage by adding an offset voltage, inputs the converted positive voltage to the analog-to-digital converter, and from the digital value converted by the analog-to-digital converter. A value corresponding to the offset voltage may be subtracted.
  • the voltage generated in the element When the voltage generated in the element is negative, the negative voltage is converted to a positive voltage by adding an offset voltage. Thereby, the voltage which generate
  • the value obtained by subtracting the value corresponding to the offset voltage from the digital value converted by the analog-digital converter is negative. Thereby, the voltage generated in the element can be detected as a negative value. Therefore, it is possible to detect the direction of the current flowing through the plurality of battery cells.
  • the input processing unit rectifies the voltage generated in the element to convert it to a positive voltage, inputs the converted positive voltage to the analog-to-digital converter, and adds the positive / negative to the digital value converted by the analog-to-digital converter. You may give the code
  • the negative voltage is converted into an absolute value by rectification.
  • produces in an element can be detected using a unipolar analog-digital converter.
  • a negative sign is given to the digital value converted by the analog-digital converter.
  • the voltage generated in the element can be detected as a negative value. Therefore, it is possible to detect the direction of the current flowing through the plurality of battery cells.
  • a detection circuit is a detection circuit connected to a plurality of battery cells and an element that generates a voltage corresponding to a current flowing through the plurality of battery cells, and converts the voltage into a digital value.
  • a single-polarity analog-to-digital converter, and an input processing unit that selectively inputs the voltage of each battery cell and the voltage generated in the element to the analog-to-digital converter, and the input processing unit determines the polarity of the selected voltage.
  • a first operation that is input to the analog-to-digital converter without being inverted and a second operation that is input to the analog-to-digital converter by inverting the polarity of the selected voltage are performed during the first and second operations.
  • the larger digital value is determined as the voltage of each battery cell or the value of the voltage generated in the element.
  • the voltage of each battery cell and the voltage generated in the element are selectively input to the analog / digital converter and converted into a digital value by the analog / digital converter.
  • the input / output processing unit performs a first operation for inputting the selected voltage to the analog-to-digital converter without inverting the polarity of the selected voltage, and a second operation for inverting the polarity of the selected voltage and inputting the selected voltage to the analog-to-digital converter. And perform the operation. Since the analog-digital converter has a single polarity, when the input voltage is positive, the digital value converted by the analog-digital converter is positive, and when the input voltage is negative, the analog-digital converter The converted digital value is zero.
  • the digital value converted by the analog-to-digital converter during the first operation of the input processing unit is positive. Since the polarity of the voltage generated in the element is inverted during the second operation of the input processing unit, the digital value converted by the analog-digital converter is zero.
  • the digital value converted by the analog-to-digital converter during the first operation of the input processing unit is zero. Since the polarity of the voltage generated in the element is inverted during the second operation of the input processing unit, the digital value converted by the analog-digital converter is positive.
  • the larger digital value of the digital values converted by the analog-digital converter during the first and second operations of the input processing unit becomes the digital value of the voltage of the element.
  • the voltage generated in the element is proportional to the current flowing in the plurality of battery cells
  • the current flowing in the plurality of battery cells can be calculated based on the voltage generated in the element. Therefore, it is possible to detect the current flowing through the plurality of battery cells using the unipolar analog-digital converter when charging and discharging the plurality of battery cells.
  • the voltage of each battery cell and the voltage generated in the element can be converted into a digital value using a common analog-digital converter.
  • the input processing unit converts the digital value converted in the first operation
  • the second operation A negative sign may be added to the converted digital value.
  • the voltage generated in the element When the voltage generated in the element is a positive voltage, a positive sign is added to the digital value converted during the first operation. Further, when the voltage generated in the element is a negative voltage, a negative sign is given to the digital value converted in the second operation. Thereby, the voltage generated in the element can be detected as a negative voltage. Therefore, it is possible to detect the direction of the current flowing through the plurality of battery cells.
  • a battery module includes a plurality of battery cells, an element that generates a voltage corresponding to a current flowing through the plurality of battery cells, and the detection that is connected to the plurality of battery cells and the element. And a circuit.
  • the detection circuit according to the above invention is provided. Thereby, the increase in the cost of a battery module can be suppressed. Moreover, the increase in the circuit scale of a battery module can be suppressed.
  • a battery system is a battery system connected to an external device, and transmits information related to the battery module and a voltage detected by a detection circuit of the battery module to the external device.
  • a communication unit and a terminal unit that supplies power of the battery module to an external device are provided.
  • An electric vehicle includes the battery system, a motor driven by electric power from the battery system, and drive wheels that rotate by the rotational force of the motor.
  • the motor is driven by the electric power from the battery system.
  • the drive wheel is rotated by the rotational force of the motor, so that the electric vehicle moves.
  • the battery system according to the above invention is used for this electric vehicle, an increase in the cost of the electric vehicle can be suppressed. Moreover, the increase in the circuit scale of an electric vehicle can be suppressed.
  • a moving body includes a battery source, a moving main body, a power source that converts electric power from a battery module of the battery system into power for moving the moving main body, And a drive unit that moves the moving main body by the power converted by the power source.
  • the electric power from the battery system is converted into motive power by the power source, and the driving unit moves the moving main body by the motive power.
  • a power storage device includes the battery system and a system control unit that performs control related to charging or discharging of a battery module of the battery system.
  • control related to charging or discharging of the battery module is performed by the system control unit. Thereby, deterioration, overdischarge, and overcharge of the battery module can be prevented.
  • the battery system is used for the power storage device, an increase in the cost of the power storage device can be suppressed. Moreover, the increase in the circuit scale of an electric power storage apparatus can be suppressed.
  • a power supply device is a power supply device that can be connected to the outside, and is controlled by the power storage device and a system control unit of the power storage device.
  • a power conversion device that performs power conversion between the battery module and the outside is provided.
  • this power supply device power conversion is performed between the battery module and the outside by the power conversion device.
  • Control related to charging or discharging of the battery module is performed by controlling the power conversion device by the system control unit of the power storage device. Thereby, deterioration, overdischarge, and overcharge of the battery module can be prevented.
  • the battery module according to the present embodiment is mounted on an electric vehicle (for example, an electric vehicle) that uses electric power as a drive source.
  • FIG. 1 is a block diagram showing a configuration of the battery module 100 according to the first embodiment.
  • the battery module 100 includes a plurality of battery cells 10 and a plurality of PTCs (Positive Temperature Coefficient: a positive temperature coefficient) element 60, shunt resistor RS, and detection circuit 30 are included.
  • the plurality of battery cells 10 are connected in series.
  • Each battery cell 10 is a secondary battery such as a lithium ion battery or a nickel metal hydride battery.
  • the detection circuit 30 includes a detection unit 20, a processing unit 31, an A / D (analog / digital) converter 32, and a plurality of switching elements M10 to M29.
  • the detection unit 20 includes a polarity switching unit 20a, a polarity determination unit 20b, a capacitor C1, and switching elements S11 and S12.
  • the battery cell 10 from the highest potential side to the battery cell 10 at the lowest potential side are referred to as battery cells C01 to C09, respectively.
  • the negative electrode of the battery cell C09 is connected to the node N0 through the current detection shunt resistor RS.
  • Node N0 is held at a reference potential (ground potential).
  • Switching element M10 is connected between PTC element 60 connected to the positive electrode of battery cell C01 and node N1.
  • switching elements M11 to M18 are connected between PTC element 60 connected to the positive electrodes of battery cells C02 to C09 and node N1, respectively.
  • Switching element M19 is connected between PTC element 60 connected to the negative electrode of battery cell C09 and node N1.
  • the switching elements M20 to M28 are connected between the PTC element 60 connected to the negative electrodes of the battery cells C01 to C09 and the node N2, respectively.
  • Switching element M29 is connected between nodes N0 and N2.
  • the switching element S11 is connected between the node N1 and the node N3, and the switching element S12 is connected between the node N2 and the node N4.
  • Capacitor C1 is connected between nodes N3 and N4.
  • the polarity switching unit 20a includes four switching elements S21, S22, S23, and S24.
  • Switching element S21 is connected between nodes N3 and N5.
  • Switching element S22 is connected between nodes N3 and N6.
  • Node N6 is held at a reference potential (ground potential).
  • Switching element S23 is connected between nodes N4 and N5.
  • Switching element S24 is connected between nodes N4 and N6.
  • the polarity determination unit 20b determines the polarity of the voltage between the node N3 and the node N4 by comparing the voltage V1 of the node N3 and the voltage V2 of the node N4, and gives a signal indicating the determination result to the processing unit 31.
  • the A / D converter 32 converts the voltage at the node N5 of the detection unit 20 into a digital value.
  • the A / D converter 32 has a single polarity. Therefore, when a positive voltage is input, the A / D converter 32 converts the voltage into a digital value and outputs the digital value.
  • the A / D converter 32 outputs 0 when 0 or a negative voltage is input.
  • the processing unit 31 is configured by hardware such as a logic circuit and a memory. Further, the processing unit 31 controls on / off of the switching elements M10 to M29, S11, S12 and on / off of switching elements S25, S26 (see FIGS. 6 and 8 described later) of the switching unit 20f. Further, the processing unit 31 controls on and off of the switching elements S21 to S24 of the polarity switching unit 20a based on a signal given from the polarity determination unit 20b.
  • the processing unit 31 communicates with the battery ECU 101 via a bus 103 in FIG. 27 described later.
  • the processing unit 31 is connected to the plurality of thermistors 11 shown in FIG. Thereby, the processing unit 31 detects the temperature of the battery module 100.
  • the detection circuit 30 serves as both a voltage detection circuit that detects terminal voltages of the battery cells C01 to C09 and a current detection circuit that detects current flowing in the battery module 100.
  • the operation of the detection circuit 30 will be described with reference to FIG. In the initial state, the switching elements M10 to M29, S11, S12, and S21 to S24 are turned off.
  • the switching elements M10 and M20 When detecting the terminal voltage of the battery cell C01, the switching elements M10 and M20 are turned on. Thereby, the terminal voltage of the battery cell C01 is applied between the nodes N1 and N2. Next, the switching elements S11 and S12 are turned on. Thereby, the capacitor C1 is charged to the terminal voltage of the battery cell C01. Subsequently, the switching elements S11 and S12 are turned off. Thereby, the capacitor C1 is disconnected from the battery cell C01. As a result, the voltage of the capacitor C1 is held at the terminal voltage of the battery cell C01.
  • the switching elements S21 and S24 are turned on.
  • the voltage of the capacitor C1 is applied between the nodes N5 and N6.
  • a positive voltage is input to the A / D converter 32.
  • the A / D converter 32 converts the input voltage into a digital value and supplies it to the processing unit 31.
  • the processing unit 31 gives a positive sign to the digital value given by the A / D converter 32.
  • the processing unit 31 detects the terminal voltage of the battery cell C01 as a positive digital value.
  • switching elements S21 and S24 and switching elements M10 and M20 are turned off.
  • the switching elements M11 to M18 and the switching elements M21 to M28 are turned on and off instead of the switching elements M10 and M20 being turned on and off, respectively. Subsequent operations of the switching elements S11 and S12 and the switching elements S21 to S24 are the same as when the terminal voltage of the battery cell C01 is detected.
  • the switching elements M19 and M29 are turned on. As a result, the voltage across the shunt resistor RS is applied between the nodes N1 and N2. Next, the switching elements S11 and S12 are turned on. As a result, the capacitor C1 is charged to the voltage across the shunt resistor RS. Subsequently, the switching elements S11 and S12 are turned off. Thereby, the capacitor C1 is disconnected from the shunt resistor RS. As a result, the voltage of the capacitor C1 is held at the voltage across the shunt resistor RS.
  • the polarity determination unit 20b compares the voltage V1 at the node N3 with the voltage V2 at the node N4. When the voltage V1 is equal to or higher than the voltage V2, the polarity determination unit 20b provides a signal indicating that the voltage of the capacitor C1 is positive to the processing unit 31. When the voltage V1 is lower than the voltage V2, the polarity determination unit 20b gives a signal indicating that the voltage of the capacitor C1 is negative to the processing unit 31.
  • the switching elements S21 and S24 are turned on. As a result, the voltage of the capacitor C1 is applied between the nodes N5 and N6. In this case, a positive voltage is input to the A / D converter 32.
  • the A / D converter 32 converts the input voltage into a digital value and supplies it to the processing unit 31.
  • the processing unit 31 gives a positive sign to the digital value given by the A / D converter 32. Thereby, in the processing unit 31, a voltage proportional to the current flowing through the battery module 100 is detected as a positive digital value.
  • the switching elements S22 and S23 are turned on. Thereby, the negative voltage of the capacitor C1 is applied between the nodes N6 and N5.
  • a positive voltage is input to the A / D converter 32.
  • the A / D converter 32 converts the input voltage into a digital value and supplies it to the processing unit 31.
  • the processing unit 31 gives a negative sign to the digital value given by the A / D converter 32.
  • the processing unit 31 detects a voltage proportional to the current flowing through the battery module 100 as a negative digital value.
  • the processing unit 31 stores a resistance value of the shunt resistor RS in advance.
  • the processing unit 31 calculates the current value by dividing the detected positive or negative digital value by the resistance value of the shunt resistor RS. Thereby, in the process part 31, the electric current which flows into the battery module 100 is detected as a positive or negative digital value. Finally, switching elements S21 to S24 and switching elements M19 and M29 are turned off.
  • the terminal voltage of each battery cell 10 and the voltage across the shunt resistor RS are selectively input to the A / D converter 32, and the A / D converter 32. Is converted into a digital value.
  • the common A / D converter 32 can be used to convert the terminal voltage of each battery cell 10 and the voltage across the shunt resistor RS into digital values.
  • the processing unit 31 converts the negative voltage into a positive voltage by inverting the polarity of the negative voltage via the polarity switching unit 20a.
  • the voltage across the shunt resistor RS can be detected using the unipolar A / D converter 32 when the battery module 100 is charged and discharged. Since the voltage across the shunt resistor RS is proportional to the current flowing through the battery module 100, the current flowing through the battery module 100 can be calculated based on the voltage across the shunt resistor RS.
  • the processing unit 31 gives a negative sign to the digital value converted by the A / D converter 32. Thereby, the voltage across the shunt resistor RS can be detected as a negative voltage. Therefore, the direction of the current flowing through the battery module 100 can be detected.
  • the terminal voltage of each battery cell 10 and the current flowing through the battery module 100 can be easily detected at an arbitrary timing by controlling the switching elements M10 to M20. .
  • the switching elements M10 and M20 are turned on. Thereafter, the switching elements M10 and M20 are turned off, and the switching elements M11 and M21 are turned on. Thereafter, the switching elements M11 and M21 are turned off, and the switching elements M12 and M22 are turned on. The same procedure is repeated to turn off the switching elements M18 and M28 and turn on the switching elements M19 and M29.
  • the voltages at both ends of the battery cells C01 to C09 and the shunt resistor RS can be detected in order without using another synchronization configuration.
  • the switching elements M10 and M20 are turned on. Subsequently, the switching elements M10 and M20 are turned off, and the switching elements M19 and M29 are turned on. Thereby, the terminal voltage of the battery cell C01 and the current flowing through the battery module 100 are detected almost simultaneously.
  • the switching elements M19 and M29 are turned off and the switching elements M11 and M21 are turned on. Subsequently, the switching elements M11 and M21 are turned off, and the switching elements M19 and M29 are turned on. Thereby, the terminal voltage of the battery cell C02 and the current flowing through the battery module 100 are detected almost simultaneously.
  • the detection circuit 30 can control the detection timing of the terminal voltage of each battery cell 10 and the current flowing through the battery module 100 with a simple configuration without depending on an external control unit.
  • the internal resistance of each battery cell 10 can be easily calculated with high accuracy.
  • the charge rate (SOC) of each battery cell 10 can be calculated with high accuracy by using the value of the voltage of each battery cell 10 and the value of the current flowing through the battery module 100 at substantially the same point.
  • FIG. 1 A battery module according to a second embodiment will be described while referring to differences from the battery module 100 according to the first embodiment.
  • the battery module 100 according to the second embodiment has the same configuration as the battery module 100 according to the first embodiment of FIG.
  • the operation of the detection circuit 30 is different from the operation of the detection circuit 30 of the battery module 100 according to the first embodiment.
  • the operation of the detection circuit 30 according to the second embodiment will be described with reference to FIG.
  • the switching elements M10 and M20 are turned on when the terminal voltage of the battery cell C01 is detected. Thereby, the terminal voltage of the battery cell C01 is applied between the nodes N1 and N2. Next, the switching elements S11 and S12 are turned on. Thereby, the capacitor C1 is charged to the terminal voltage of the battery cell C01. Subsequently, the switching elements S11 and S12 are turned off. Thereby, the capacitor C1 is disconnected from the battery cell C01. As a result, the voltage of the capacitor C1 is held at the terminal voltage of the battery cell C01.
  • the polarity determination unit 20b compares the voltage V1 of the node N3 with the voltage V2 of the node N4. When the voltage V1 is equal to or higher than the voltage V2, the polarity determination unit 20b provides a signal indicating that the voltage of the capacitor C1 is positive to the processing unit 31. When the voltage V1 is lower than the voltage V2, the polarity determination unit 20b gives a signal indicating that the voltage of the capacitor C1 is negative to the processing unit 31.
  • the switching elements S21 and S24 are turned on. As a result, the voltage of the capacitor C1 is applied between the nodes N5 and N6. In this case, a positive voltage is input to the A / D converter 32.
  • the A / D converter 32 converts the input voltage into a digital value and supplies it to the processing unit 31.
  • the processing unit 31 gives a positive sign to the digital value given by the A / D converter 32. As a result, the processing unit 31 detects the terminal voltage of the battery cell C01 as a positive digital value.
  • the switching elements S22 and S23 are turned on.
  • the voltage of the capacitor C1 is applied between the nodes N6 and N5.
  • a positive voltage is input to the A / D converter 32.
  • the A / D converter 32 converts the input voltage into a digital value and supplies it to the processing unit 31.
  • the processing unit 31 gives a negative sign to the digital value given by the A / D converter 32. Actually, the voltage of the capacitor C1 never becomes negative.
  • the switching elements M11 to M18 and the switching elements M21 to M28 are turned on and off instead of the switching elements M10 and M20 being turned on and off, respectively. Subsequent operations of the switching elements S11 and S12 and the switching elements S21 to S24 are the same as when the terminal voltage of the battery cell C01 is detected.
  • the procedure for detecting the current flowing through the battery module 100 is the same as the procedure for detecting the current flowing through the battery module 100 in the first embodiment.
  • the direction of the current flowing through the shunt resistor RS is reversed when the battery module 100 is charged and discharged. Therefore, the voltage of the capacitor C1 becomes positive during charging, and the voltage of the capacitor C1 becomes negative during discharging.
  • the processing unit 31 detects the current flowing through the battery module 100 as a positive or negative digital value.
  • the processing unit 31 assigns a sign to the terminal voltages of the battery cells C01 to C09 based on the comparison result between the voltage V1 at the node N3 and the voltage V2 at the node N4.
  • the terminal voltage of the battery cells C01 to C09 and the voltage across the shunt resistor RS can be detected by the same algorithm.
  • the process of detecting the terminal voltages of the battery cells C01 to C09 and the current flowing through the battery module 100 can be simplified.
  • FIG. 2 is a block diagram showing a configuration of the battery module 100 according to the third embodiment.
  • the battery module 100 according to the present embodiment has the same configuration as the battery module 100 according to the first embodiment of FIG. 1 except that the detection unit 20 of the detection circuit 30 does not have the polarity determination unit 20b.
  • the switching elements M10 and M20 When detecting the terminal voltage of the battery cell C01, the switching elements M10 and M20 are turned on. Thereby, the terminal voltage of the battery cell C01 is applied between the nodes N1 and N2. Next, the switching elements S11 and S12 are turned on. Thereby, the capacitor C1 is charged to the terminal voltage of the battery cell C01. Subsequently, the switching elements S11 and S12 are turned off. Thereby, the capacitor C1 is disconnected from the battery cell C01. As a result, the voltage of the capacitor C1 is held at the terminal voltage of the battery cell C01.
  • the switching elements S21 and S24 are turned on.
  • the voltage of the capacitor C1 is applied between the nodes N5 and N6.
  • a positive voltage is input to the A / D converter 32.
  • the A / D converter 32 converts the input voltage into a digital value and gives it to the processing unit 31 as a first value.
  • the switching elements S21 and S24 are turned off, and the switching elements S22 and S23 are turned on.
  • the voltage of the capacitor C1 is applied between the nodes N6 and N5.
  • a negative voltage is input to the A / D converter 32. Since the A / D converter 32 is unipolar, when a negative voltage is input, the A / D converter 32 gives a value of 0 to the processing unit 31 as a second value.
  • the processing unit 31 compares the first value with the second value. When the first value is higher than the second value, the voltage of the capacitor C1 is positive, and when the first value is lower than the second value, the voltage of the capacitor C1 is negative. When the voltage of the capacitor C1 is positive, the processing unit 31 determines that the first value given by the A / D converter 32 is the terminal voltage of the battery cell C01, and gives a positive sign to the first value. To do. As a result, the processing unit 31 detects the terminal voltage of the battery cell C01 as a positive digital value. When the voltage of the capacitor C1 is negative, the processing unit 31 determines that the second value given by the A / D converter 32 is the terminal voltage of the battery cell C01, and gives a negative sign to the second value. To do. Actually, the voltage of the capacitor C1 never becomes negative.
  • the switching elements M11 to M18 and the switching elements M21 to M28 are turned on and off instead of the switching elements M10 and M20 being turned on and off, respectively. Subsequent operations of the switching elements S11 and S12 and the switching elements S21 to S24 are the same as when the terminal voltage of the battery cell C01 is detected.
  • the switching elements M19 and M29 are turned on. As a result, the voltage across the shunt resistor RS is applied between the nodes N1 and N2. Next, the switching elements S11 and S12 are turned on. As a result, the capacitor C1 is charged to the voltage across the shunt resistor RS. Subsequently, the switching elements S11 and S12 are turned off. Thereby, the capacitor C1 is disconnected from the shunt resistor RS. As a result, the voltage of the capacitor C1 is held at the voltage across the shunt resistor RS.
  • the switching elements S21 and S24 are turned on. As a result, the voltage of the capacitor C1 is applied between the nodes N5 and N6.
  • a positive or negative voltage is input to the A / D converter 32.
  • the A / D converter 32 converts the input voltage into a digital value and supplies the digital value to the processing unit 31 as a first value.
  • the A / D converter 32 gives the value of 0 to the processing unit 31 as the first value.
  • the switching elements S21 and S24 are turned off, and the switching elements S22 and S23 are turned on.
  • the voltage of the capacitor C1 is applied between the nodes N6 and N5.
  • a positive or negative voltage is input to the A / D converter 32.
  • the A / D converter 32 converts the input voltage into a digital value and provides the digital value to the processing unit 31.
  • the A / D converter 32 gives the value of 0 to the processing unit 31 as the second value.
  • the processing unit 31 compares the first value with the second value. When the first value is higher than the second value, the voltage of the capacitor C1 is positive, and when the first value is lower than the second value, the voltage of the capacitor C1 is negative. When the voltage of the capacitor C1 is positive, the processing unit 31 determines that the first value given by the A / D converter 32 is the voltage across the shunt resistor RS, and adds a positive sign to the first value. Give. Thereby, in the processing unit 31, a voltage proportional to the current flowing through the battery module 100 is detected as a positive digital value.
  • the processing unit 31 determines that the second value given by the A / D converter 32 is the voltage across the shunt resistor RS, and assigns a negative sign to the second value. Give. As a result, the processing unit 31 detects a voltage proportional to the current flowing through the battery module 100 as a negative digital value.
  • the processing unit 31 calculates the current value by dividing the detected positive or negative digital value by the resistance value of the shunt resistor RS. Thereby, in the process part 31, the electric current which flows into the battery module 100 is detected as a positive or negative digital value. Finally, switching elements S21 to S24 and switching elements M19 and M29 are turned off.
  • the detection unit 20 of the present embodiment is not provided in the detection unit 20 of the present embodiment. Thereby, the structure of the detection part 20 can be simplified.
  • FIG. 3 is a block diagram illustrating a configuration of the detection unit 20 of the detection circuit 30 according to the fourth embodiment.
  • the detection unit 20 in the present embodiment further includes a differential amplifier 20c.
  • the differential amplifier 20c has two input terminals and an output terminal. One input terminal of differential amplifier 20c is connected to node N5, and the other input terminal is connected to node N6.
  • the differential amplifier 20c differentially amplifies the voltages input to the two input terminals, and outputs the amplified voltage from the output terminal.
  • the voltage output from the output terminal of the differential amplifier 20 c is input to the A / D converter 32.
  • the procedure for detecting the terminal voltage of battery cell 10 and the current flowing in battery module 100 in the present embodiment is the same as the procedure for detecting the terminal voltage of battery cell 10 and the current flowing in battery module 100 in the first embodiment. It is.
  • the terminal voltage of the battery cell 10 when the terminal voltage of the battery cell 10 is detected, the terminal voltage of the battery cell 10 is held in the capacitor C1.
  • the voltage held in the capacitor C1 is differentially amplified by the differential amplifier 20c and input to the A / D converter 32.
  • the voltage across the shunt resistor RS of FIGS. 1 and 2 is held in the capacitor C1.
  • the voltage held in the capacitor C1 is differentially amplified by the differential amplifier 20c and input to the A / D converter 32.
  • the processing unit 31 can detect the terminal voltage of the battery cell 10 and the current flowing through the battery module 100 with sufficient accuracy. Become.
  • FIG. 4 is a block diagram illustrating a configuration of the detection unit 20 of the detection circuit 30 according to the fifth embodiment.
  • the detection unit 20 in the present embodiment further includes a switching element S31.
  • the switching element S31 has terminals t1, t2, and t3.
  • the terminal t1 of the switching element S31 is connected to the node N5.
  • the terminal t2 of the switching element S31 is connected to the output terminal of the differential amplifier 20c.
  • the voltage at the terminal t3 of the switching element S31 is input to the A / D converter 32.
  • the switching element S31 is switched by the processing unit 31 so that either the terminal t1 or the terminal t2 is selectively connected to the terminal t3.
  • the procedure for detecting the terminal voltage of the battery cell 10 and the current flowing through the battery module 100 in the present embodiment is the same as that of the battery cell 10 in the first and fourth embodiments except for switching of the switching element S31. This is the same as the procedure for detecting the current flowing through the module 100.
  • the processing unit 31 can detect the terminal voltage of the battery cell 10. Further, when detecting the current flowing through the battery module 100, the voltage across the shunt resistor RS of FIGS. 1 and 2 is held in the capacitor C1. The switching element S31 is switched by the processing unit 31 so that the terminal t2 is connected to the terminal t3. In this case, the voltage held in the capacitor C1 is differentially amplified by the differential amplifier 20c and input to the A / D converter 32.
  • the processing unit 31 can detect the current flowing through the battery module 100 with sufficient accuracy.
  • FIG. 5 is a block diagram illustrating a configuration of the detection unit 20 of the detection circuit 30 according to the sixth embodiment.
  • the detection unit 20 in the present embodiment further includes a differential amplifier 20c. Further, a switching element S11a is provided instead of the switching element S11 of FIG.
  • the switching element S11a has terminals t4, t5, and t6.
  • One input terminal of the differential amplifier 20c is connected to the node N1, and the other input terminal is connected to the node N2.
  • a terminal t4 of the switching element S11a is connected to the node N1.
  • the terminal t5 of the switching element S11a is connected to the output terminal of the differential amplifier 20c.
  • Terminal t6 of switching element S11a is connected to node N3.
  • the switching element S11a is switched by the processing unit 31 so that either the terminal t4 or the terminal t5 is selectively connected to the terminal t6.
  • the procedure for detecting the terminal voltage of the battery cell 10 and the current flowing through the battery module 100 in the present embodiment is the same as that of the terminal voltage of the battery cell 10 and the battery module 100 in the first embodiment except for switching of the switching element S11a. This is the same as the procedure for detecting the flowing current.
  • the switching element S11a is switched by the processing unit 31 so that the terminal t4 is connected to the terminal t6.
  • the terminal voltage of the battery cell 10 is held in the capacitor C1.
  • the voltage held in the capacitor C1 is input to the A / D converter 32.
  • the switching element S11a is switched by the processing unit 31 so that the terminal t5 is connected to the terminal t6.
  • the voltage across the shunt resistor RS of FIGS. 1 and 2 is differentially amplified by the differential amplifier 20c and held in the capacitor C1.
  • the voltage held in the capacitor C1 is input to the A / D converter 32.
  • the processing unit 31 can detect the current flowing through the battery module 100 with sufficient accuracy.
  • FIG. 6 is a block diagram illustrating a configuration of the detection unit 20 of the detection circuit 30 according to the seventh embodiment.
  • the detection unit 20 includes a switching unit 20f, an offset unit 20g, a capacitor C1, and switching elements S11A and S12A.
  • the switching element S11A has terminals t11, t12, and t13.
  • the switching element S12A has terminals t21, t22, and t23.
  • the offset unit 20g has two input terminals and an output terminal. One input terminal of the offset unit 20g is connected to the node N1. The other input terminal of the offset unit 20g is connected to the node N2. The configuration of the offset unit 20g will be described later.
  • the terminal t11 of the switching element S11A is connected to the node N1.
  • the terminal t12 of the switching element S11A is connected to the output terminal of the offset unit 20g.
  • Terminal t13 of switching element S11A is connected to node N3.
  • the switching element S11A is switched by the processing unit 31 so that either the terminal t11 or the terminal t12 is selectively connected to the terminal t13.
  • a terminal t21 of the switching element S12A is connected to a reference potential (ground potential).
  • Terminal t22 of switching element S12A is connected to node N2.
  • Terminal t23 of switching element S12A is connected to node N4.
  • the switching element S12A is switched by the processing unit 31 so that either the terminal t21 or the terminal t22 is selectively connected to the terminal t23.
  • Capacitor C1 is connected between nodes N3 and N4.
  • the switching unit 20f includes two switching elements S25 and S26.
  • Switching element S25 is connected between nodes N3 and N5.
  • Switching element S26 is connected between nodes N4 and N6.
  • Node N6 is held at a reference potential (ground potential).
  • FIG. 7 is a circuit diagram showing an example of the configuration of the offset unit 20g.
  • the offset unit 20g in FIG. 7 includes an operational amplifier 20d, a DC power supply E1, and four resistors R1, R2, R3, and R4. In the present embodiment, the resistance values of the resistors R1 to R4 are equal.
  • the non-inverting input terminal IN1 of the operational amplifier 20d is connected to the node N1 through the resistor R1.
  • the non-inverting input terminal IN1 of the operational amplifier 20d is connected to the positive electrode of the DC power supply E1 through the resistor R3.
  • the inverting input terminal IN2 of the operational amplifier 20d is connected to the node N2 via the resistor R2.
  • a resistor R4 is connected between the inverting input terminal IN2 and the output terminal OUT of the operational amplifier 20d.
  • the output terminal OUT of the operational amplifier 20d is connected to the terminal t12.
  • the operational amplifier 20d outputs a voltage obtained by adding the offset voltage from the DC power source E1 to the voltage between the nodes N1 and N2 (hereinafter referred to as an addition voltage).
  • the offset voltage by the DC power supply E1 is set so that the added voltage becomes positive. Therefore, even when the voltage between the nodes N1 and N2 is negative, the offset unit 20g converts the negative voltage into a positive voltage by adding the offset voltage, and outputs the positive voltage to the terminals t12 and t21. .
  • the procedure for detecting the terminal voltage of the battery cell 10 and the current flowing through the battery module 100 in the present embodiment will be described with reference to FIGS. 1 and 6.
  • the switching elements M10 to M29, S11A, S12A, S25, and S26 are turned off.
  • the switching elements M10 and M20 When detecting the terminal voltage of the battery cell C01, the switching elements M10 and M20 are turned on. Thereby, the terminal voltage of the battery cell C01 is applied between the nodes N1 and N2. Next, the switching element S11A is switched by the processing unit 31 so that the terminal t11 is connected to the terminal t13, and the switching element S12A is switched so that the terminal t22 is connected to the terminal t23. Thereby, the capacitor C1 is charged to the terminal voltage of the battery cell C01. Subsequently, the switching elements S11A and S12A are turned off. Thereby, the capacitor C1 is disconnected from the battery cell C01. As a result, the voltage of the capacitor C1 is held at the terminal voltage of the battery cell C01.
  • the switching elements S25 and S26 are turned on.
  • the voltage of the capacitor C1 is applied between the nodes N5 and N6.
  • a positive voltage is input to the A / D converter 32.
  • the A / D converter 32 converts the input voltage into a digital value and supplies it to the processing unit 31.
  • the processing unit 31 gives a positive sign to the digital value given by the A / D converter 32.
  • the processing unit 31 detects the terminal voltage of the battery cell C01 as a positive digital value.
  • switching elements S21 and S24 and switching elements M10 and M20 are turned off.
  • the switching elements M11 to M18 and the switching elements M21 to M28 are turned on and off instead of the switching elements M10 and M20 being turned on and off, respectively. Subsequent operations of the switching elements S11A, S12A and the switching elements S25, S26 are the same as when the terminal voltage of the battery cell C01 is detected.
  • the switching elements M19 and M29 are turned on. As a result, the voltage across the shunt resistor RS is applied between the nodes N1 and N2.
  • the switching element S11A is switched so that the terminal t12 is connected to the terminal t13, and the switching element S12A is switched so that the terminal t21 is connected to the terminal t23.
  • the voltage between the nodes N1 and N2 is input to the offset unit 20g.
  • the offset unit 20g adds the offset voltage to the input voltage and outputs a positive added voltage between the terminals t12 and t21.
  • Capacitor C1 is charged to the added voltage.
  • the switching elements S11A and S12A are turned off. Thereby, the capacitor C1 is disconnected from the shunt resistor RS. As a result, the voltage of the capacitor C1 is held at the added voltage.
  • the switching elements S25 and S26 are turned on.
  • the voltage of the capacitor C1 is applied between the nodes N5 and N6.
  • a positive voltage is input to the A / D converter 32.
  • the A / D converter 32 converts the input voltage into a digital value and supplies it to the processing unit 31.
  • the processing unit 31 subtracts a value corresponding to the offset voltage by the offset unit 20g from the digital value.
  • the processing unit 31 detects a voltage proportional to the current flowing through the battery module 100 as a positive or negative digital value.
  • the processing unit 31 calculates the current value by dividing the detected positive or negative digital value by the resistance values at both ends of the shunt resistor RS. Thereby, the processing unit 31 detects the current flowing through the battery module 100 as a positive or negative value. Finally, switching elements S25 and S26 and switching elements M19 and M29 are turned off.
  • the offset voltage by the offset unit 20g is added to the voltage, so that the positive added voltage is A / D converted. Is input to the device 32. Thereby, the electric current which flows into the battery module 100 is detectable using the unipolar A / D converter 32 at the time of charge or discharge.
  • the voltage across the shunt resistor RS when the voltage across the shunt resistor RS is negative, a value obtained by subtracting a value corresponding to the offset voltage by the offset unit 20g from the digital value converted by the A / D converter 32 is negative. Thereby, the voltage across the shunt resistor RS can be detected as a negative value. Therefore, the direction of the current flowing through the battery module 100 can be detected.
  • FIG. 8 is a block diagram illustrating a configuration of the detection unit 20 of the detection circuit 30 according to the eighth embodiment.
  • the detection unit 20 includes a polarity determination unit 20b, a rectification unit 20e, a switching unit 20f, a capacitor C1, and switching elements S11A and S12A.
  • the switching element S11A has terminals t11, t12, and t13.
  • the switching element S12A has terminals t21, t22, and t23.
  • the rectifying unit 20e has two input terminals and two output terminals. One input terminal of the rectifying unit 20e is connected to the node N1. The other input terminal of the rectifying unit 20e is connected to the node N2. The configuration of the rectifying unit 20e will be described later.
  • the terminal t11 of the switching element S11A is connected to the node N1.
  • a terminal t12 of the switching element S11A is connected to one output terminal of the rectifying unit 20e.
  • Terminal t13 of switching element S11A is connected to node N3.
  • the switching element S11A is switched by the processing unit 31 so that either the terminal t11 or the terminal t12 is selectively connected to the terminal t13.
  • the terminal t21 of the switching element S12A is connected to the other output terminal of the rectifying unit 20e.
  • Terminal t22 of switching element S12A is connected to node N2.
  • Terminal t23 of switching element S12A is connected to node N4.
  • the switching element S12A is switched by the processing unit 31 so that either the terminal t21 or the terminal t22 is selectively connected to the terminal t23.
  • Capacitor C1 is connected between nodes N3 and N4.
  • the switching unit 20f includes two switching elements S25 and S26.
  • Switching element S25 is connected between nodes N3 and N5.
  • Switching element S26 is connected between nodes N4 and N6.
  • Node N6 is held at a reference potential (ground potential).
  • the polarity determination unit 20b determines the polarity of the voltage between the node N1 and the node N2 by comparing the voltage V3 of the node N1 and the voltage V4 of the node N2, and gives a signal indicating the determination result to the processing unit 31.
  • FIG. 9 is a circuit diagram showing an example of the configuration of the rectifying unit 20e.
  • the rectifying unit 20e in FIG. 9 includes four diodes D1, D2, D3, and D4.
  • the cathode of the diode D1 and the anode of the diode D2 are connected to the node N1.
  • the cathode of diode D3 and the anode of diode D4 are connected to node N2.
  • the cathode of the diode D2 and the cathode of the diode D4 are connected to the terminal t12.
  • the anode of the diode D1 and the anode of the diode D3 are connected to the terminal t21.
  • the diodes D2 and D3 are turned on and the diodes D1 and D4 are turned off.
  • the voltage between the node N1 and the node N2 is output between the terminal t12 and the terminal t21. Therefore, the voltage between the terminals t12 and t21 is positive.
  • the diodes D1 and D4 are turned on and the diodes D2 and D3 are turned off.
  • the voltage between the node N1 and the node N2 is output between the terminal t12 and the terminal t21. Therefore, the voltage between the terminals t12 and t21 is positive.
  • the voltage between the terminals t12 and t21 is the absolute value of the voltage between the nodes N1 and N2.
  • FIG. 10 is a circuit diagram showing another example of the configuration of the rectifying unit 20e. 10 includes two operational amplifiers OP1 and OP2, five resistors R5, R6, R7, R8, and R9, and two diodes D5 and D6. In the present embodiment, the resistance values of the resistors R5 and R6 are equal. The resistance values of the resistors R7 and R9 are equal. The resistance value of the resistor R8 is half of the resistance values of the resistors R7 and R9.
  • the inverting input terminal IN2 of the operational amplifier OP1 is connected to the node N1 through the resistor R5.
  • the non-inverting input terminal IN1 of the operational amplifier OP1 is connected to the node N2.
  • the cathode of the diode D5 is connected to the output terminal OUT of the operational amplifier OP1.
  • the anode of the diode D5 is connected to the node N7.
  • the cathode of the diode D6 is connected to the inverting input terminal IN2 of the operational amplifier OP1.
  • the anode of the diode D6 is connected to the output terminal OUT of the operational amplifier OP1.
  • a resistor R6 is connected between the inverting input terminal IN2 of the operational amplifier OP1 and the node N7.
  • the inverting input terminal IN2 of the operational amplifier OP2 is connected to the node N1 through the resistor R7. Further, the inverting input terminal IN2 of the operational amplifier OP2 is connected to the node N7 via the resistor R8. The non-inverting input terminal IN1 of the operational amplifier OP2 is connected to the node N2. A resistor R9 is connected between the inverting input terminal IN2 and the output terminal OUT of the operational amplifier OP2. Terminal t12 is connected to output terminal OUT of operational amplifier OP2. Terminal t21 is connected to node N2.
  • the voltage (V3-V4) between the nodes N1 and N2 is set as the input voltage Vi.
  • the input voltage Vi is input to the inverting input terminal IN2 of the operational amplifier OP1.
  • the input voltage Vi is positive.
  • the input voltage Vi is inverted by the operational amplifier OP1, and the voltage at the node N7 becomes ⁇ Vi.
  • the voltage ⁇ Vi and the input voltage Vi of the node N7 are input to the inverting input terminal IN2 of the operational amplifier OP2.
  • the voltage ⁇ Vi at the node N7 is multiplied by ⁇ 2 by the operational amplifier OP2 to become 2Vi, and the input voltage Vi is inverted by the operational amplifier OP2 to become ⁇ Vi.
  • the voltage 2Vi and the voltage ⁇ Vi are added by the operational amplifier OP2, and the voltage Vi is output from the output terminal OUT of the operational amplifier OP2.
  • the input voltage Vi is negative.
  • the gain of the operational amplifier OP1 is zero.
  • the voltage at the node N7 becomes zero.
  • the zero voltage and the input voltage Vi at the node N7 are input to the inverting input terminal IN2 of the operational amplifier OP2.
  • the voltage at the node N7 remains 0, and the input voltage Vi is inverted by the operational amplifier OP2 to become -Vi.
  • the voltage 0 and the voltage ⁇ Vi are added by the operational amplifier OP2, and the voltage ⁇ Vi is output from the output terminal OUT of the operational amplifier OP2. Since the voltage Vi is negative, the voltage ⁇ Vi is positive.
  • the voltage between the terminals t12 and t21 is the absolute value of the voltage between the nodes N1 and N2.
  • the procedure for detecting the terminal voltages of the battery cells C01 to C09 and the current flowing through the battery module 100 in the present embodiment will be described with reference to FIGS.
  • the switching elements M10 to M29, S11A, S12A, S25, and S26 are turned off.
  • the switching elements M10 and M20 When detecting the terminal voltage of the battery cell C01, the switching elements M10 and M20 are turned on. Thereby, the terminal voltage of battery cell C01 is applied between nodes N1 and N2. Next, the switching element S11A is switched by the processing unit 31 so that the terminal t11 is connected to the terminal t13, and the switching element S12A is switched so that the terminal t22 is connected to the terminal t23. Thereby, the capacitor C1 is charged to the terminal voltage of the battery cell C01. Subsequently, the switching elements S11A and S12A are turned off. Thereby, the capacitor C1 is disconnected from the battery cell C01. As a result, the voltage of the capacitor C1 is held at the terminal voltage of the battery cell C01.
  • the switching elements S25 and S26 are turned on.
  • the voltage of the capacitor C1 is applied between the nodes N5 and N6.
  • a positive voltage is input to the A / D converter 32.
  • the A / D converter 32 converts the input voltage into a digital value and supplies it to the processing unit 31.
  • the processing unit 31 gives a positive sign to the digital value given by the A / D converter 32.
  • the processing unit 31 detects the terminal voltage of the battery cell C01 as a positive digital value.
  • switching elements S25 and S26 and switching elements M10 and M20 are turned off.
  • the switching elements M11 to M18 and the switching elements M21 to M28 are turned on and off instead of the switching elements M10 and M20 being turned on and off, respectively. Subsequent operations of the switching elements S11A, S12A and the switching elements S25, S26 are the same as when the terminal voltage of the battery cell C01 is detected.
  • the switching elements M19 and M29 are turned on. As a result, the voltage across the shunt resistor RS is applied between the nodes N1 and N2. In this case, the voltage between the nodes N1 and N2 is input to the rectifying unit 20e.
  • the rectifier 20e converts the input voltage into an absolute value (positive voltage) and outputs the voltage between the terminals t12 and t21.
  • the polarity determination unit 20b compares the voltage V3 at the node N1 with the voltage V4 at the node N2. When the voltage V3 is equal to or higher than the voltage V4, the polarity determination unit 20b provides the processing unit 31 with a signal indicating that the voltage input to the rectification unit 20e is positive. When the voltage V3 is lower than the voltage V4, the polarity determination unit 20b provides the processing unit 31 with a signal indicating that the voltage input to the rectification unit 20e is negative.
  • the switching element S11A is switched so that the terminal t12 is connected to the terminal t13, and the switching element S12A is switched so that the terminal t21 is connected to the terminal t23.
  • the capacitor C1 is charged to the absolute value of the voltage across the shunt resistor RS.
  • the switching elements S11A and S12A are turned off.
  • the capacitor C1 is disconnected from the shunt resistor RS.
  • the voltage of the capacitor C1 is held at the absolute value of the voltage across the shunt resistor RS.
  • the switching elements S25 and S26 are turned on.
  • a positive voltage is input to the A / D converter 32.
  • the A / D converter 32 converts the input voltage into a digital value and supplies it to the processing unit 31.
  • the processing unit 31 gives a positive sign to the digital value provided by the A / D converter 32.
  • a voltage proportional to the current flowing through the battery module 100 is detected as a positive digital value.
  • the processing unit 31 gives a negative sign to the digital value provided by the A / D converter 32.
  • the processing unit 31 detects a voltage proportional to the current flowing through the battery module 100 as a negative digital value.
  • the processing unit 31 calculates a current value by dividing the detected positive or negative digital value by the resistance value of the shunt resistor RS. Thereby, the processing unit 31 detects the current flowing through the battery module 100 as a positive or negative value. Finally, switching elements S25 and S26 and switching elements M19 and M29 are turned off.
  • the absolute value of the voltage across the shunt resistor RS is input to the A / D converter 32 by the rectifier 20e. The Thereby, the electric current which flows into the battery module 100 is detectable using the unipolar A / D converter 32 at the time of charge or discharge.
  • the processing unit 31 gives a negative sign to the digital value converted by the A / D converter 32. Thereby, the voltage across the shunt resistor RS can be detected as a negative value. Therefore, the direction of the current flowing through the battery module 100 can be detected.
  • FIG. 11 is an external perspective view of the battery module 100
  • FIG. 12 is a plan view of the battery module 100
  • FIG. 13 is a side view of the battery module 100.
  • FIGS. 11 to 13 and FIGS. 15 to 26 described later three directions orthogonal to each other are defined as an X direction, a Y direction, and a Z direction, as indicated by arrows X, Y, and Z.
  • the X direction and the Y direction are directions parallel to the horizontal plane
  • the Z direction is a direction orthogonal to the horizontal plane.
  • the upward direction is the direction in which the arrow Z faces.
  • a plurality of battery cells 10 having a flat, substantially rectangular parallelepiped shape are arranged in the X direction.
  • the plurality of battery cells 10 are integrally fixed by a pair of end face frames 92, a pair of upper end frames 93 and a pair of lower end frames 94.
  • the plurality of battery cells 10, the pair of end face frames 92, the pair of upper end frames 93, and the pair of lower end frames 94 constitute a substantially rectangular parallelepiped battery block 10B.
  • the battery block 10B has an upper surface parallel to the XY plane.
  • the battery module 100 includes nine battery cells 10, whereas in the examples of FIGS. 11 to 13, the battery module 100 includes eighteen battery cells 10.
  • the battery module 100 includes one detection circuit 30 (see FIG. 1), and one detection circuit 30 detects the terminal voltages of the 18 battery cells 10.
  • the battery module 100 may include two detection circuits 30, and each detection circuit 30 may detect the terminal voltage of nine battery cells 10.
  • the voltage value at both ends of the shunt resistor RS is detected by one detection circuit 30.
  • the detection circuit 30 has the configuration in any one of the first to eighth embodiments.
  • the pair of end face frames 92 have a substantially plate shape and are arranged in parallel to the YZ plane.
  • the pair of upper end frames 93 and the pair of lower end frames 94 are arranged so as to extend in the X direction. Connection portions for connecting the pair of upper end frames 93 and the pair of lower end frames 94 are formed at the four corners of the pair of end surface frames 92.
  • the pair of upper end frames 93 are attached to the upper connection portions of the pair of end surface frames 92, and the lower connection of the pair of end surface frames 92 is performed.
  • a pair of lower end frames 94 are attached to the part.
  • the some battery cell 10 is fixed integrally in the state arrange
  • a rigid printed circuit board (hereinafter abbreviated as a printed circuit board) 21 is attached to one end face frame 92 with an interval on the outer surface.
  • a detection circuit 30 is provided on the printed circuit board 21.
  • each battery cell 10 has a plus electrode 10a and a minus electrode 10b on the upper surface portion so as to be arranged along the Y direction.
  • Each electrode 10a, 10b is inclined and provided so as to protrude upward (see FIG. 13).
  • the plurality of battery cells 10 have a gas vent valve 10v at the center of the upper surface portion.
  • the gas inside the battery cell 10 is discharged from the gas vent valve 10v. Thereby, the excessive pressure rise inside the battery cell 10 is prevented.
  • each battery cell 10 is arranged so that the positional relationship between the plus electrode 10 a and the minus electrode 10 b in the Y direction is opposite between the adjacent battery cells 10. Further, one electrode 10a, 10b of the plurality of battery cells 10 is arranged in a line along the X direction, and the other electrode 10a, 10b of the plurality of battery cells 10 is arranged in a line along the X direction. Thereby, between two adjacent battery cells 10, the plus electrode 10a of one battery cell 10 and the minus electrode 10b of the other battery cell 10 are adjacent to each other, and the minus electrode 10b of one battery cell 10 and the other The positive electrode 10a of the battery cell 10 is adjacent. In this state, the bus bar 40 is attached to two adjacent electrodes. Thereby, the some battery cell 10 is connected in series.
  • a common bus bar 40 is attached to the negative electrode 10b of the first battery cell 10 and the positive electrode 10a of the second battery cell 10.
  • a common bus bar 40 is attached to the negative electrode 10b of the second battery cell 10 and the positive electrode 10a of the third battery cell 10.
  • a common bus bar 40 is attached to the minus electrode 10b of each odd-numbered battery cell 10 and the plus electrode 10a of the even-numbered battery cell 10 adjacent thereto.
  • a common bus bar 40 is attached to the minus electrode 10b of each even-numbered battery cell 10 and the plus electrode 10a of the odd-numbered battery cell 10 adjacent thereto.
  • a bus bar 40a for connecting a power line 501 (see FIG. 27 described later) from the outside is attached to the plus electrode 10a of the first battery cell 10 and the minus electrode 10b of the 18th battery cell 10, respectively.
  • a long flexible printed circuit board (hereinafter abbreviated as FPC board) 50 extending in the X direction is commonly connected to the plurality of bus bars 40 and 40a on one end side of the plurality of battery cells 10 in the Y direction. ing. Similarly, a long FPC board 50 extending in the X direction is commonly connected to the plurality of bus bars 40 on the other end side of the plurality of battery cells 10 in the Y direction.
  • the FPC board 50 has a configuration in which a plurality of conductor wires 51 and 52 (see FIG. 16 described later) are mainly formed on an insulating layer, and has flexibility and flexibility.
  • a plurality of conductor wires 51 and 52 are mainly formed on an insulating layer, and has flexibility and flexibility.
  • polyimide is used as the material of the insulating layer constituting the FPC board 50
  • copper is used as the material of the conductor wires 51 and 52 (see FIG. 16 described later).
  • a plurality of PTC elements 60 are attached to each FPC board 50.
  • Each PTC element 60 is disposed in the vicinity of each bus bar 40, 40a. Details of the FPC board 50 and the PTC element 60 will be described later.
  • Each FPC board 50 is folded at a right angle toward the inside at the upper end portion of the end face frame 92 (the end face frame 92 to which the printed circuit board 21 is attached (see FIG. 11)), and is further folded back downward. 21 is connected.
  • bus bar 40 for connecting the plus electrode 10a and the minus electrode 10b of two adjacent battery cells 10 is referred to as a bus bar 40 for two electrodes, and the plus electrode 10a or the minus electrode 10b of one battery cell 10 and the power source
  • the bus bar 40a for connecting the line 501 is called a one-electrode bus bar 40a.
  • FIG. 14A is an external perspective view of the bus bar 40 for two electrodes
  • FIG. 14B is an external perspective view of the bus bar 40a for one electrode.
  • the two-electrode bus bar 40 includes a base portion 41 having a substantially rectangular shape and a pair of attachment pieces 42 that bend and extend from one side of the base portion 41 to one surface thereof.
  • a pair of electrode connection holes 43 are formed in the base portion 41.
  • the one-electrode bus bar 40a includes a base portion 45 having a substantially square shape and a mounting piece 46 that is bent and extends from one side of the base portion 45 to one surface thereof.
  • An electrode connection hole 47 is formed in the base portion 45.
  • the bus bars 40, 40a have a configuration in which, for example, nickel plating is applied to the surface of tough pitch copper.
  • FIG. 15 is an external perspective view showing a state in which a plurality of bus bars 40, 40a and a plurality of PTC elements 60 are attached to the FPC board 50.
  • FIG. 15 mounting pieces 42 and 46 of a plurality of bus bars 40 and 40a are attached to the two FPC boards 50 at predetermined intervals along the X direction. Further, the plurality of PTC elements 60 are respectively attached to the two FPC boards 50 at the same interval as the interval between the plurality of bus bars 40, 40a.
  • a member in which the FPC board 50 and the plurality of bus bars 40, 40a are integrally coupled in this manner is hereinafter referred to as a wiring member 70.
  • the plurality of bus bars 40, 40a and the plurality of bus bars 40, 40a and the plurality of battery cells 10 integrally fixed by the end face frame 92, the upper end frame 93, and the lower end frame 94 of FIG.
  • Two FPC boards 50 to which a plurality of PTC elements 60 are attached are attached.
  • the plus electrode 10a and the minus electrode 10b of the adjacent battery cells 10 are the electrodes of each bus bar 40. It is fitted in the connection hole 43. Further, the plus electrode 10a of the first battery cell 10 and the minus electrode 10b of the 18th battery cell 10 are fitted into the electrode connection holes 47 of the bus bar 40a, respectively. Male screws are formed on the plus electrode 10a and the minus electrode 10b. In a state where the bus bars 40 and 40a are fitted into the plus electrode 10a and the minus electrode 10b of the battery cell 10, a nut (not shown) is screwed into the male threads of the plus electrode 10a and the minus electrode 10b.
  • the plurality of bus bars 40, 40a are attached to the plurality of battery cells 10, and the FPC board 50 is held in a substantially horizontal posture by the plurality of bus bars 40, 40a.
  • FIG. 16 is a schematic plan view for explaining the connection between the bus bars 40, 40 a and the detection circuit 30.
  • the FPC board 50 is provided with a plurality of conductor wires 51 and 52 so as to correspond to the plurality of bus bars 40 and 40a, respectively.
  • Each conductor wire 51 is provided so as to extend in parallel in the Y direction between the mounting pieces 42 and 46 of the bus bars 40 and 40a and the PTC element 60 disposed in the vicinity of the bus bars 40 and 40a.
  • each conductor wire 51 is provided so as to be exposed on the lower surface side of the FPC board 50.
  • One end of each conductor wire 51 exposed on the lower surface side is electrically connected to the mounting pieces 42 and 46 of each bus bar 40 and 40a, for example, by soldering or welding. Thereby, the FPC board 50 is fixed to each bus bar 40, 40a.
  • each conductor line 51 and one end of each conductor line 52 are provided so as to be exposed on the upper surface side of the FPC board 50.
  • a pair of terminals (not shown) of the PTC element 60 are connected to the other end of each conductor wire 51 and one end of each conductor wire 52 by, for example, soldering.
  • the PTC element 60 has a resistance temperature characteristic in which the resistance value rapidly increases when the temperature exceeds a certain value.
  • the temperature of the PTC element 60 may increase due to a current flowing through the short circuit path. In that case, the resistance value of the PTC element 60 increases. This prevents a large current from flowing through the short circuit path including the PTC element 60.
  • Each PTC element 60 is preferably arranged in a region between both ends of the corresponding bus bar 40, 40a in the X direction.
  • the area of the FPC board 50 between the adjacent bus bars 40, 40a is easily bent, but the area of the FPC board 50 between both ends of each bus bar 40, 40a is fixed to the bus bars 40, 40a. Therefore, it is kept relatively flat. Therefore, each PTC element 60 is disposed in the region of the FPC board 50 between both ends of each bus bar 40, 40a, so that the connectivity between the PTC element 60 and the conductor wires 51, 52 is sufficiently ensured. Moreover, the influence (for example, change of the resistance value of the PTC element 60) on each PTC element 60 by the bending of the FPC board 50 is suppressed.
  • the printed circuit board 21 is provided with a plurality of connection terminals 22 corresponding to the plurality of conductor lines 52 of the FPC board 50.
  • the plurality of connection terminals 22 and the detection circuit 30 are electrically connected on the printed circuit board 21.
  • the other end of each conductor wire 52 of the FPC board 50 is connected to the corresponding connection terminal 22 by, for example, soldering or welding.
  • the connection between the printed circuit board 21 and the FPC board 50 is not limited to soldering or welding, and may be performed using a connector.
  • each bus bar 40, 40a is electrically connected to the detection circuit 30 via the PTC element 60. Thereby, the terminal voltage of each battery cell 10 is detected.
  • FIG. 17 is an external perspective view showing the configuration of the battery module 100 according to the first modified example.
  • the battery module 100 further includes a gas duct 71.
  • the gas duct 71 is provided on the upper surface of the battery block 10B so as to cover the gas vent valves 10v (see FIG. 11) of the plurality of battery cells 10. Thereby, the gas discharged from the gas vent valve 10v of the battery cell 10 can be efficiently discharged to the outside through the gas duct 71.
  • FIG. 18 is an exploded perspective view showing the configuration of the battery module 100 according to the second modified example.
  • the battery module 100 according to the second modification is disposed in a casing (housing) CA having an open top.
  • the battery module 100 further includes a gas duct 71 and a lid member 80.
  • the printed circuit board 21 of FIG. 17 is not attached to the end face frame 92.
  • the lid member 80 is made of an insulating material such as resin and has a rectangular plate shape.
  • the gas duct 71, the wiring member 70, the lid member 80, and the printed circuit board 21 are sequentially arranged on the upper surface of the battery block 10B.
  • the wiring member 70 and the gas duct 71 are attached to the lower surface of the lid member 80, and the printed circuit board 21 is attached to the upper surface of the lid member 80.
  • Battery block 10B is housed in casing CA, and lid member 80 is fitted to casing CA so as to close the opening of casing CA. Thereby, the battery box BB that houses the battery module 100 is formed.
  • FIG. 19 is a perspective view of the lid member 80 of FIG. 18 as viewed obliquely from below.
  • FIG. 20 is a perspective view of the lid member 80 of FIG. 18 as viewed obliquely from above.
  • the side 80a of the lid member 80 is along a side E1 (see FIG. 18) in one direction of the battery block 10B (see FIG. 18), and the side 80b of the lid 80 is a side E2 in the other direction of the battery block 10B (see FIG. 18). See).
  • the surface of the lid member 80 facing the battery block 10B is called a back surface
  • the surface of the lid member 80 on the opposite side is called a front surface. In this example, the surface of the lid member 80 is directed upward.
  • FPC fitting portions 84 are formed on the back surface of the lid member 80 so as to extend along the side sides 80a and the side sides 80b of the lid member 80, respectively.
  • the FPC board 50 of the wiring member 70 is fitted into the FPC fitting portion 84.
  • the FPC fitting portions 84 provided along the side 80a and the side 80b of the lid member 80 are referred to as the FPC fitting 84 on the side 80a side and the side 80b side, respectively.
  • a plurality of concave portions 81 and 82 are provided along the FPC fitting portions 84 on the side 80a side and the side 80b side.
  • nine concave portions 81 are provided along the FPC fitting portion 84 on the side 80a side.
  • One recess 82, eight recesses 81, and another one recess 82 are provided along the side 80 b of the lid member 80.
  • the concave portions 81 and 82 have a substantially rectangular shape, and the length of the concave portion 81 in the X direction is larger than the length of the concave portion 82 in the X direction.
  • the shape and length of the recess 81 are substantially equal to the shape and length of the bus bar 40, and the shape and length of the recess 82 are substantially equal to the shape and length of the bus bar 40a.
  • a plurality of openings 83 are formed so as to penetrate from the bottom surfaces of the plurality of recesses 81 and 82 to the surface of the lid member 80 (see FIG. 20). Two openings 83 (see FIG. 20) are formed in each recess 81, and one opening 83 (see FIG. 20) is formed in each recess 82.
  • the recess 81 and the opening 83 provided along the side 80a of the lid member 80 are referred to as the recess 81 on the side 80a and the opening 83 on the side 80a, respectively, and along the side 80b of the lid 80.
  • the recesses 81 and 82 and the opening 83 thus provided are referred to as the recesses 81 and 82 on the side 80b side and the opening 83 on the side 80b side, respectively.
  • the bus bar 40 of the wiring member 70 is fitted into the recess 81 of the lid member 80, and the bus bar 40 a of the wiring member 70 is fitted into the recess 82.
  • the electrode connection hole 43 of the bus bar 40 is exposed to the surface side of the lid member 80 in the opening 83.
  • the electrode connection hole 47 of the bus bar 40 a is exposed to the surface side of the lid member 80 in the opening 83 in a state where the bus bar 40 a is fitted in the recess 82.
  • a duct fitting portion 87 is formed so as to extend in the X direction between the plurality of recesses 81 on the side 80a side and the plurality of recesses 81, 82 on the side 80b side.
  • a gas duct 71 is fitted into the duct fitting portion 87.
  • a plurality of pairs of connection grooves 85 are formed so as to extend from the plurality of recesses 81 on the side 80a side to the FPC fitting portion 84 on the side 80a side.
  • a plurality of pairs of connection grooves 85 are formed so as to extend from the plurality of recesses 81 on the side 80b side to the FPC fitting portion 84 on the side 80b side.
  • a plurality of connection grooves 86 are formed to extend from the plurality of recesses 82 on the side 80b side to the FPC fitting portion 84 on the side 80b side.
  • a pair of attachment pieces 42 of the plurality of bus bars 40 are respectively disposed in the plurality of pairs of connection grooves 85. In the plurality of connection grooves 86, the attachment pieces 46 of the plurality of bus bars 40a are respectively arranged.
  • FIG. 21 is a view of the plurality of bus bars 40, 40a and the two FPC boards 50 in the second modification as viewed from above.
  • the FPC board 50 of FIG. 21 has the same configuration as the FPC board 50 of FIG. 16 except for the following points.
  • each FPC board 50 further includes a plurality of connection terminals 22 a corresponding to the plurality of conductor lines 52.
  • the plurality of connection terminals 22a are arranged so as to be aligned in the X direction along one side of each FPC board 50.
  • Each conductor line 52 is provided to extend parallel to the Y direction between the corresponding PTC element 60 and the connection terminal 22a.
  • the connection terminals 22a and the bus bars 40, 40a are electrically connected by the conductor wires 51, 52 and the PTC element 60.
  • FIG. 22 is a view of the printed circuit board 21 in the second modification as viewed from above.
  • the printed circuit board 21 in FIG. 22 has the same configuration as the printed circuit board 21 in FIG. 16 except for the following points.
  • the printed circuit board 21 has a rectangular plate shape.
  • the plurality of connection terminals 22 of the printed circuit board 21 are arranged along the one side and the other side of the printed circuit board 21 in the X direction.
  • the plurality of connection terminals 22 correspond to the plurality of connection terminals 22a (see FIG. 21) of the FPC board 50.
  • FIG. 23 is a schematic cross-sectional view showing a connection structure between the FPC board 50 and the printed circuit board 21 in the second modified example.
  • FIG. 23 shows a connection structure between one connection terminal 22 a of the FPC board 50 and one connection terminal 22 of the printed circuit board 21.
  • a hole 53 is formed in each connection terminal 22a of the FPC board 50, and a hole 23 is formed in each connection terminal 22 of the printed circuit board 21.
  • a hole 88 is formed in a portion of the lid member 80 between each connection terminal 22a and each connection terminal 22.
  • a connection member PH is attached between each connection terminal 22 a and each connection terminal 22.
  • a pin header is used as the connection member PH.
  • the connection member PH has a pin PN1 protruding downward and a pin PN2 protruding upward.
  • the pins PN1 and PN2 are formed of one pin integrally with each other. Note that the pins PN1 and PN2 may be separate if the pins PN1 and PN2 are electrically connected.
  • the pin PN1 of the connecting member PH is inserted into the hole 53 of the FPC board 50 from above the FPC board 50, and the pin PN2 of the connecting member PH is inserted into the hole 88 of the lid member 80 and the printed circuit board 21 from below the lid member 80. It is inserted into the hole 23.
  • connection terminal 22a of the FPC is connected to the connection terminal 22a of the FPC by the solder SO, and the pin PN2 is connected to the connection terminal 22 of the printed circuit board 21.
  • each connection terminal 22 a of the FPC board 50 is electrically connected to the corresponding connection terminal 22 of the printed circuit board 21.
  • the gas duct 71, the wiring member 70, and the printed circuit board 21 are attached to the lid member 80.
  • the lid member 80 is attached to the upper surface of the battery block 10B.
  • the positive electrodes 10a (see FIG. 18) and the negative electrodes 10b (see FIG. 18) of the plurality of battery cells 10 are fitted into the electrode connection holes 43 of the plurality of bus bars 40.
  • the positive electrodes 10a or the negative electrodes 10b of the plurality of battery cells 10 are inserted into the electrode connection holes 47 of the plurality of bus bars 40a.
  • the gas duct 71 is disposed on the upper surface of the battery block 10B so as to cover the gas vent valves 10v of the plurality of battery cells 10.
  • a nut (not shown) is screwed into the male threads of the plus electrode 10a and the minus electrode 10b. Thereby, adjacent battery cells 10 are electrically connected via the bus bar 40. As a result, the plurality of battery cells 10 are connected in series.
  • a plurality of bus bars 40, 40a are connected to the detection circuit 30 (see FIG. 22) on the printed circuit board 21 via the FPC board 50.
  • the gas duct 71, the wiring member 70, and the printed circuit board 21 are integrally provided on the lid member 80. Therefore, the battery module 100 can be easily assembled by attaching the lid member 80 to the battery block 10B. Further, the gas discharged from the gas vent valve 10v of the battery cell 10 can be efficiently discharged to the outside through the gas duct 71.
  • the area of the upper surface of the battery block 10B is larger than the area of the end face frame 92 (see FIG. 18). Therefore, a printed circuit board 21 larger than the printed circuit board 21 in FIG. 11 can be disposed on the upper surface of the battery block 10B in FIG. Therefore, a larger number of circuits can be mounted on the printed circuit board 21.
  • the battery box BB that houses the battery module 100 is formed, whereby the strength of the battery module 100 is improved. Further, since the battery block 10B of the battery module 100 is fixed to the casing CA of the battery box BB and the lid member 80 is fitted to the casing CA, the battery block 10B and the lid member 80 can be reliably fixed. .
  • the opening of the casing CA is closed by the lid member 80. Therefore, the inside of the battery box BB may be molded with resin. In this case, condensation of the battery cell 10 can be prevented. Further, the resin molded in the battery box BB can affect the heat conduction characteristics of the battery module 100. For example, by molding the inside of the battery box BB with a resin having a higher thermal conductivity than air, the heat in the battery box BB can be released to the outside. On the other hand, by molding the inside of the battery box BB with a resin having a thermal conductivity lower than that of air, the inflow of heat from the outside into the battery box BB can be blocked.
  • the inside of the battery box BB can be exhausted by providing a hole in at least one of the casing CA and the lid member 80.
  • the gas duct 71 may not be provided in the battery module 100.
  • FIG. 24 is an exploded perspective view showing the configuration of the battery module 100 according to the third modification. Differences of the battery module 100 according to the third modification from the battery module 100 according to the second modification will be described.
  • the gas duct 71, the lid member 80, the wiring member 70, and the printed circuit board 21 are sequentially arranged on the upper surface of the battery block 10B.
  • the battery module 100 according to the third modification and the battery module 100 according to the second modification have different positional relationships between the lid member 80 and the FPC board 50.
  • the gas duct 71 is attached to the lower surface of the lid member 80, and the wiring member 70 and the printed circuit board 21 are attached to the upper surface of the lid member 80.
  • FIG. 25 is a perspective view of the lid member 80 of FIG. 24 as viewed obliquely from below.
  • FIG. 26 is a perspective view of the lid member 80 of FIG. 24 as viewed obliquely from above.
  • the back surface of the lid member 80 has the same configuration as the surface of the lid member 80 of FIG. 20 except that a duct fitting portion 87 is formed.
  • the surface of the lid member 80 has the same configuration as the back surface of the lid member 80 of FIG. 19 except that the duct fitting portion 87 is not formed.
  • connection between the FPC board 50 and the printed circuit board 21 is the same as the connection between the FPC board 50 and the printed circuit board 21 in the second modification.
  • the lid member 80 since the lid member 80 is not disposed between the FPC board 50 and the printed circuit board 21, the hole 88 of FIG. 23 is not provided in the lid member 80.
  • the gas duct 71, the wiring member 70, and the printed circuit board 21 are attached to the lid member 80.
  • the bus bars 40, 40 a of the wiring member 70 are attached to the surface of the lid member 80.
  • the plurality of bus bars 40, 40a are connected to the plus electrode 10a and the minus electrode 10b of the plurality of battery cells 10 in the same manner as the battery module 100 according to the second modification.
  • the gas duct 71, the wiring member 70, and the printed circuit board 21 are integrally provided on the lid member 80. Therefore, the battery module 100 can be easily assembled by attaching the lid member 80 to the battery block 10B. Further, the gas discharged from the gas vent valve 10v of the battery cell 10 can be efficiently discharged to the outside through the gas duct 71.
  • the area of the upper surface of the battery block 10B is larger than the area of the end face frame 92 (see FIG. 24). Therefore, the printed circuit board 21 larger than the printed circuit board 21 of FIG. 11 can be disposed on the upper surface of the battery block 10B of FIG. Therefore, a larger number of circuits can be mounted on the printed circuit board 21.
  • the FPC board 50 is provided on the upper surface of the battery block 10B.
  • the FPC board 50 has the battery block 10B. It may be provided in a state of being separated from the upper surface.
  • the FPC board 50 is disposed on the lower surface of the lid member 80, so that the FPC board 50 is provided in a state of being separated from the upper surface of the battery block 10B.
  • the FPC board 50 is disposed on the upper surface of the lid member 80, whereby the FPC board 50 is provided in a state of being separated from the upper surface of the battery block 10B.
  • the FPC board 50 may be provided in a state of being separated from the upper surface of the battery block 10B by fitting the FPC board 50 into the lid member 80.
  • FIG. 27 is a block diagram showing electrical connection of main parts of the battery system.
  • the battery system 500 is mainly composed of a plurality (four in this example) of battery modules 100, a battery ECU (Electronic Control unit (electronic control unit) 101 and contactor 102 are connected to main control unit 300 of the electric vehicle via bus 104.
  • Each battery module 100 has the structure shown in FIGS.
  • the plurality of battery modules 100 of the battery system 500 are connected to each other through the power line 501.
  • Each battery module 100 further includes a plurality (five in this example) of thermistors 11.
  • the battery cells 10 arranged at both ends are connected to the power line 501 through the bus bar 40a. Thereby, in the battery system 500, all the battery cells 10 of the plurality of battery modules 100 are connected in series.
  • the detection circuit 30 is electrically connected to each thermistor 11.
  • the detection circuit 30 detects the temperature of the battery module 100 together with the terminal voltage of each battery cell 10 and the current flowing through the battery module 100.
  • the temperature of the battery module 100, the terminal voltage of each battery cell 10, and the current flowing through the battery module 100 are referred to as cell information.
  • the detection circuit 30 of each battery module 100 is communicably connected to the battery ECU 101.
  • the detection circuit 30 of each battery module 100 is connected to the battery ECU 101 via the bus 103.
  • the processing unit 31 of the detection circuit 30 in FIG. 1 transmits the detected cell information to the battery ECU 101 via the bus 103.
  • Battery ECU 101 calculates the charge amount of each battery cell 10 based on the cell information given from each detection circuit 30. Further, the battery ECU 101 detects an abnormality of each battery module 100 based on the cell information given from each detection circuit 30.
  • the abnormality of the battery module 100 is, for example, overdischarge, overcharge, or temperature abnormality of the battery cell 10.
  • the power supply line 501 connected to the highest potential positive electrode and the power supply line 501 connected to the lowest potential negative electrode of the plurality of battery modules 100 are connected via a contactor 102 to a load such as a motor of an electric vehicle.
  • a contactor 102 to a load such as a motor of an electric vehicle.
  • the battery ECU 101 is connected to the main control unit 300 via the bus 104.
  • a charge amount of each battery module 100 (a charge amount of the battery cell 10) is given from each battery ECU 101 to the main control unit 300.
  • the main control unit 300 controls the power of the electric vehicle (for example, the rotational speed of the motor) based on the amount of charge.
  • the main control unit 300 controls each power generation device (not shown) connected to the power line 501 to charge each battery module 100.
  • FIG. 28 is a schematic plan view showing a first example of the arrangement of the battery system 500.
  • the battery system 500 includes four battery modules 100, a battery ECU 101, a contactor 102, an HV (High A high voltage connector 520 and a service plug 530 are provided.
  • the four battery modules 100 are referred to as battery modules 100a, 100b, 100c, and 100d, respectively.
  • the end face frame 92 to which the printed circuit board 21 (see FIG. 11) is attached is called an end face frame 92a, and the end face to which the printed circuit board 21 is not attached.
  • the frame 92 is referred to as an end face frame 92b.
  • the end face frame 92a is hatched.
  • the battery modules 100a to 100d, the battery ECU 101, the contactor 102, the HV connector 520, and the service plug 530 are accommodated in a box-shaped casing 550.
  • Casing 550 has side portions 550a, 550b, 550c, and 550d.
  • the side surface portions 550a and 550c are parallel to each other, and the side surface portions 550b and 550d are parallel to each other and perpendicular to the side surface portions 550a and 550c.
  • the battery modules 100a and 100b are arranged so as to be arranged at a predetermined interval.
  • the battery modules 100a and 100b are arranged so that the end face frame 92b of the battery module 100a and the end face frame 92a of the battery module 100b face each other.
  • the battery modules 100c and 100d are arranged to line up at a predetermined interval.
  • the battery modules 100a and 100b are arranged so that the end face frame 92a of the battery module 100c and the end face frame 92b of the battery module 100d face each other.
  • the battery modules 100a and 100b arranged so as to be aligned with each other are referred to as a module row T1
  • the battery modules 100c and 100d arranged so as to be aligned with each other are referred to as a module row T2.
  • the module row T1 is arranged along the side surface portion 550a, and the module row T2 is arranged in parallel with the module row T1.
  • the end surface frame 92a of the battery module 100a in the module row T1 is directed to the side surface portion 550d, and the end surface frame 92b of the battery module 100b is directed to the side surface portion 550b.
  • the end surface frame 92b of the battery module 100c in the module row T2 is directed to the side surface portion 550d, and the end surface frame 92a of the battery module 100d is directed to the side surface portion 550b.
  • the battery ECU 101, the service plug 530, the HV connector 520, and the contactor 102 are arranged in this order from the side surface portion 550d to the side surface portion 550b.
  • the positive electrode 10a (see FIG. 12) of the battery cell 10 adjacent to the end face frame 92a has the highest potential
  • the negative electrode 10b of the battery cell 10 adjacent to the end face frame 92b (see FIG. 12). ) Is the lowest potential.
  • the positive electrode 10a having the highest potential in each of the battery modules 100a to 100d is referred to as a high potential electrode 10A
  • the negative electrode 10b having the lowest potential in each of the battery modules 100a to 100d is referred to as a low potential electrode 10B.
  • the low potential electrode 10B of the battery module 100a and the high potential electrode 10A of the battery module 100b are connected to each other via a strip-shaped bus bar 501a as the power supply line 501 in FIG.
  • the high potential electrode 10A of the battery module 100c and the low potential electrode 10B of the battery module 100d are connected to each other via a strip-shaped bus bar 501a as the power supply line 501 in FIG.
  • the high potential electrode 10A of the battery module 100a is connected to the service plug 530 as the power supply line 501 of FIG. 27 via the power supply line Q1, and the low potential electrode 10B of the battery module 100c is connected as the power supply line 501 of FIG. To the service plug 530.
  • the service plug 530 When the service plug 530 is turned on, the battery modules 100a to 100d are connected in series. In this case, the potential of the high potential electrode 10A of the battery module 100d is the highest, and the potential of the low potential electrode 10B of the battery module 100b is the lowest.
  • the service plug 530 is turned off by an operator when the battery system 500 is maintained, for example.
  • the series circuit composed of the battery modules 100a and 100b and the series circuit composed of the battery modules 100c and 100d are electrically separated.
  • the total voltage of the series circuit including the battery modules 100a and 100b is equal to the total voltage of the series circuit including the battery modules 100c and 100d. This prevents a high voltage from being generated in the battery system 500 during maintenance.
  • the low potential electrode 10B of the battery module 100b is connected to the contactor 102 through the power supply line Q3 as the power supply line 501 in FIG. 27, and the high potential electrode 10A of the battery module 100d is connected through the power supply line Q4 as the power supply line 501 in FIG. Connected to contactor 102.
  • Contactor 102 is connected to HV connector 520 via power supply lines Q5 and Q6 as power supply line 501 in FIG.
  • the HV connector 520 is connected to a load such as a motor of an electric vehicle.
  • the battery module 100b is connected to the HV connector 520 via the power supply lines Q3 and Q5, and the battery module 100d is connected to the HV connector 520 via the power supply lines Q4 and Q6.
  • the battery module 100a to 100d is supplied to the load.
  • the contactor 102 When the contactor 102 is turned off, the connection between the battery module 100b and the HV connector 520 and the connection between the battery module 100d and the HV connector 520 are cut off.
  • the detection circuit 30 (see FIG. 1) of the battery module 100a and the detection circuit 30 of the battery module 100b are connected to each other via the communication line P1.
  • the detection circuit 30 of the battery module 100a and the detection circuit 30 of the battery module 100c are connected to each other via the communication line P2.
  • the detection circuit 30 of the battery module 100c and the detection circuit 30 of the battery module 100d are connected to each other via the communication line P3.
  • the detection circuit 30 of the battery module 100b is connected to the battery ECU 101 via the communication line P4, and the detection circuit 30 of the battery module 100d is connected to the battery ECU 101 via the communication line P5.
  • the cell information is detected by the detection circuit 30 in each of the battery modules 100a to 100d.
  • the cell information detected by the detection circuit 30 of the battery module 100a is given to the battery ECU 101 via the communication lines P2, P3, P5.
  • the cell information detected by the detection circuit 30 of the battery module 100b is given to the battery ECU 101 via the communication lines P1, P2, P3, P5.
  • the cell information detected by the detection circuit 30 of the battery module 100c is given to the battery ECU 101 via the communication lines P3 and P5.
  • the cell information detected by the detection circuit 30 of the battery module 100d is given to the battery ECU 101 via the communication line P5.
  • the battery modules 100a to 100d since the battery modules 100a to 100d are connected in series, at least one of the battery modules 100a to 100d may have a function of detecting a current flowing through the battery module 100.
  • the battery module 100a has a function of detecting current. Therefore, the battery modules 100b to 100d need not have the shunt resistor RS (FIGS. 1 and 2).
  • the detection circuits 30 of the battery modules 100b to 100d include switching elements M19 and M29 (FIGS. 1 and 2), switching elements S22 and S23 (FIGS. 1 to 5), and a polarity determination unit 20b (FIGS. 1 and 3 to 5).
  • FIG. 8) the switching element S31 (FIG. 4), the offset part 20g (FIG.
  • the detection circuit 30 of the battery modules 100b to 100d may not have the differential amplifier 20c shown in FIGS. Further, the detection circuit 30 of the battery modules 100b to 100d only needs to include the switching element S11 of FIG. 1 instead of the switching element S11a of FIG. 5, and instead of the switching elements S11A and S12A of FIGS. Switching elements S11 and S12 may be provided. Thereby, the cost of the battery modules 100b to 100d can be reduced.
  • FIG. 29 is a schematic plan view showing a second example of the arrangement of the battery system 500.
  • the battery system 500 of FIG. 29 will be described while referring to differences from the battery system 500 of FIG.
  • the detection circuit 30 (see FIG. 1) of the battery module 100a and the detection circuit 30 of the battery module 100b are connected to each other via a communication line P11.
  • the detection circuit 30 of the battery module 100a and the detection circuit 30 of the battery module 100c are connected to each other via the communication line P12.
  • the detection circuit 30 of the battery module 100c and the detection circuit 30 of the battery module 100d are connected to each other via the communication line P13.
  • the first circuit 30 of the battery module 100b is connected to the battery ECU 101 via the communication line P14.
  • a bus is configured by the communication lines P11 to P14.
  • the cell information detected by the detection circuit 30 of the battery module 100a is given to the battery ECU 101 via the communication lines P11 and P14.
  • the cell information detected by the detection circuit 30 of the battery module 100b is given to the battery ECU 101 via the communication line P14.
  • the cell information detected by the detection circuit 30 of the battery module 100c is given to the battery ECU 101 via the communication lines P12, P11, P14.
  • the cell information detected by the detection circuit 30 of the battery module 100d is given to the battery ECU 101 via the communication lines P13, P12, P11, P14.
  • the battery system 500 of FIG. 29 may have a function of detecting the current flowing in the battery module 100, at least one of the battery modules 100a to 100d as in the battery system 500 of FIG. Thereby, the cost of the battery module 100 can be reduced.
  • FIG. 30 is a block diagram illustrating a configuration of an electric vehicle including the battery system 500.
  • the electric automobile 600 includes a vehicle body 610. 27, the main control unit 300 and the battery system 500, the power conversion unit 601, the motor 602, the drive wheel 603, the accelerator device 604, the brake device 605, and the rotation speed sensor 606 are provided.
  • motor 602 is an alternating current (AC) motor
  • power conversion unit 601 includes an inverter circuit.
  • the battery system 500 is connected to the motor 602 via the power conversion unit 601 and to the main control unit 300.
  • the main control unit 300 is given the amount of charge of the plurality of battery modules 100 (see FIG. 1) and the value of the current flowing through the battery modules 100 from the battery ECU 101 (see FIG. 27) constituting the battery system 500. It is done.
  • an accelerator device 604, a brake device 605, and a rotation speed sensor 606 are connected to the main control unit 300.
  • the main control unit 300 includes, for example, a CPU and a memory, or a microcomputer.
  • the accelerator device 604 includes an accelerator pedal 604a included in the electric automobile 600 and an accelerator detection unit 604b that detects an operation amount (depression amount) of the accelerator pedal 604a.
  • the accelerator detector 604b detects the operation amount of the accelerator pedal 604a based on a state where the driver is not operated. The detected operation amount of the accelerator pedal 604a is given to the main controller 300.
  • the brake device 605 includes a brake pedal 605a included in the electric automobile 600 and a brake detection unit 605b that detects an operation amount (depression amount) of the brake pedal 605a by the driver.
  • the operation amount is detected by the brake detection unit 605b.
  • the detected operation amount of the brake pedal 605a is given to the main control unit 300.
  • Rotational speed sensor 606 detects the rotational speed of motor 602. The detected rotation speed is given to the main control unit 300.
  • the main controller 300 is given the amount of charge of the battery module 100, the value of the current flowing through the battery module 100, the amount of operation of the accelerator pedal 604a, the amount of operation of the brake pedal 605a, and the rotational speed of the motor 602. It is done.
  • the main control unit 300 performs charge / discharge control of the battery module 100 and power conversion control of the power conversion unit 601 based on these pieces of information.
  • the battery module 100 supplies power to the power conversion unit 601.
  • the main control unit 300 calculates a rotational force (command torque) to be transmitted to the drive wheels 603 based on the given operation amount of the accelerator pedal 604a, and outputs a control signal based on the command torque to the power conversion unit 601. To give.
  • the power conversion unit 601 that has received the control signal converts the power supplied from the battery system 500 into power (drive power) necessary for driving the drive wheels 603. As a result, the driving power converted by the power converter 601 is supplied to the motor 602, and the rotational force of the motor 602 based on the driving power is transmitted to the driving wheels 603.
  • the motor 602 functions as a power generator.
  • the power conversion unit 601 converts the regenerative power generated by the motor 602 into power suitable for charging the battery module 100 and supplies the power to the battery module 100. Thereby, the battery module 100 is charged.
  • the battery system 500 may be mounted on another mobile body such as a ship, an aircraft, an elevator, or a walking robot.
  • a ship equipped with the battery system 500 includes, for example, a hull instead of the vehicle body 610 in FIG. 30, a screw instead of the driving wheel 603, an acceleration input unit instead of the accelerator device 604, and a brake device 605 Instead, a deceleration input unit is provided.
  • the driver operates the acceleration input unit instead of the accelerator device 604 when accelerating the hull, and operates the deceleration input unit instead of the brake device 605 when decelerating the hull.
  • the hull corresponds to the moving main body
  • the motor corresponds to the power source
  • the screw corresponds to the drive unit.
  • the ship does not have to include a deceleration input unit.
  • the motor receives electric power from the battery system 500 and converts the electric power into power, and the hull moves by rotating the screw with the converted power.
  • an aircraft equipped with the battery system 500 includes, for example, a fuselage instead of the vehicle body 610 of FIG. 30, a propeller instead of the driving wheel 603, an acceleration input unit instead of the accelerator device 604, and a brake A deceleration input unit is provided instead of the device 605.
  • the airframe corresponds to the moving main body
  • the motor corresponds to the power source
  • the propeller corresponds to the drive unit.
  • the aircraft may not include a deceleration input unit.
  • the motor receives electric power from the battery system 500 and converts the electric power into motive power, and the propeller is rotated by the converted motive power, whereby the airframe moves.
  • the elevator equipped with the battery system 500 includes, for example, a saddle instead of the vehicle body 610 in FIG. 30, a lifting rope attached to the saddle instead of the driving wheel 603, and an acceleration input unit instead of the accelerator device 604. And a deceleration input unit instead of the brake device 605.
  • the kite corresponds to the moving main body
  • the motor corresponds to the power source
  • the lifting rope corresponds to the drive unit.
  • the motor receives electric power from the battery system 500 and converts the electric power into motive power, and the elevating rope is wound up by the converted motive power, so that the kite moves up and down.
  • a walking robot equipped with the battery system 500 includes, for example, a torso instead of the vehicle body 610 in FIG. 30, a foot instead of the driving wheel 603, an acceleration input unit instead of the accelerator device 604, and a brake device 605.
  • a deceleration input unit is provided instead of.
  • the body corresponds to the moving main body
  • the motor corresponds to the power source
  • the foot corresponds to the drive unit.
  • the motor receives electric power from the battery system 500 and converts the electric power into power, and the torso moves by driving the foot with the converted power.
  • the power source receives power from the battery system 500 and converts the power into power, and the drive unit is moved by the power converted by the power source. Move.
  • the power supply device includes a battery system 500 using the battery module 100 according to any one of the first to eighth embodiments.
  • FIG. 31 is a block diagram illustrating a configuration of a power supply device including a battery system 500.
  • the power supply device 700 includes a power storage device 710 and a power conversion device 720.
  • the power storage device 710 includes a battery system group 711 and a system controller 712.
  • the battery system group 711 includes a plurality of battery systems 500 using the battery module 100 according to any one of the first to eighth embodiments. Between the plurality of battery systems 500, the plurality of battery cells 10 may be connected to each other in parallel, or may be connected to each other in series.
  • the system controller 712 is an example of a system control unit, and includes, for example, a CPU and a memory, or a microcomputer.
  • the system controller 712 is connected to the battery ECU 101 (see FIG. 28) of each battery system 500.
  • the battery ECU 101 of each battery system 500 calculates the charge amount of each battery cell 10 based on the terminal voltage of each battery cell 10, and gives the calculated charge amount to the system controller 712.
  • the system controller 712 controls the power conversion device 720 based on the charge amount of each battery cell 10 given from each battery ECU 101, thereby controlling the discharge or charging of the plurality of battery cells 10 included in each battery system 500. I do.
  • the power converter 720 includes a DC / DC (DC / DC) converter 721 and a DC / AC (DC / AC) inverter 722.
  • the DC / DC converter 721 has input / output terminals 721a and 721b, and the DC / AC inverter 722 has input / output terminals 722a and 722b.
  • the input / output terminal 721 a of the DC / DC converter 721 is connected to the battery system group 711 of the power storage device 710.
  • the input / output terminal 721b of the DC / DC converter 721 and the input / output terminal 722a of the DC / AC inverter 722 are connected to each other and to the power output unit PU1.
  • the input / output terminal 722b of the DC / AC inverter 722 is connected to the power output unit PU2 and to another power system.
  • the power output units PU1, PU2 include, for example, outlets.
  • various loads are connected to the power output units PU1 and PU2.
  • Other power systems include, for example, commercial power sources or solar cells. This is an external example in which power output units PU1, PU2 and another power system are connected to a power supply device.
  • the DC / DC converter 721 and the DC / AC inverter 722 are controlled by the system controller 712, whereby the plurality of battery cells 10 included in the battery system group 711 are discharged and charged.
  • DC / DC direct current / direct current
  • DC / AC direct current / alternating current
  • the power DC / DC converted by the DC / DC converter 721 is supplied to the power output unit PU1.
  • the power DC / AC converted by the DC / AC inverter 722 is supplied to the power output unit PU2.
  • DC power is output to the outside from the power output unit PU1, and AC power is output to the outside from the power output unit PU2.
  • the electric power converted into alternating current by the DC / AC inverter 722 may be supplied to another electric power system.
  • the system controller 712 performs the following control as an example of control related to the discharge of the plurality of battery cells 10 included in each battery system 500.
  • the system controller 712 determines whether or not to stop discharging based on the charge amount of each battery cell 10 given from each battery ECU 101 (see FIG. 28), and based on the determination result.
  • the power converter 720 is controlled. Specifically, when the charge amount of any one of the plurality of battery cells 10 (see FIG. 28) included in the battery system group 711 is smaller than a predetermined threshold value, the system controller 712
  • the DC / DC converter 721 and the DC / AC inverter 722 are controlled so that the discharge is stopped or the discharge current (or discharge power) is limited. Thereby, overdischarge of each battery cell 10 is prevented.
  • AC power supplied from another power system is AC / DC (AC / DC) converted by the DC / AC inverter 722, and further DC / DC (DC) is converted by the DC / DC converter 721. / DC) converted.
  • AC / DC AC / DC
  • DC DC / DC
  • a plurality of battery cells 10 included in the battery system group 711 are charged.
  • the system controller 712 performs the following control as an example of control related to charging of the plurality of battery cells 10 included in each battery system 500.
  • the system controller 712 determines whether or not to stop charging based on the charge amount of each battery cell 10 given from each battery ECU 101 (see FIG. 28), and based on the determination result.
  • the power converter 720 is controlled. Specifically, when the charge amount of any one of the plurality of battery cells 10 included in the battery system group 711 exceeds a predetermined threshold value, the system controller 712 stops charging. Or the DC / DC converter 721 and the DC / AC inverter 722 are controlled such that the charging current (or charging power) is limited. Thereby, overcharge of each battery cell 10 is prevented.
  • the power supply device 700 according to the present embodiment is provided with the battery system 500 using the battery module 100 according to any one of the first to eighth embodiments.
  • the reliability of the device 700 can be improved and the cost can be reduced.
  • the system controller 712 may have the same function as the battery ECU 101 instead of providing the battery ECU 101 in each battery system 500.
  • the power conversion apparatus 720 may include only one of the DC / DC converter 721 and the DC / AC inverter 722. Further, the power conversion device 720 may not be provided as long as power can be supplied between the power supply device 700 and the outside.
  • 31 is provided with a plurality of battery systems 500, but is not limited thereto, and only one battery system 500 may be provided.
  • the terminal voltage of the battery cell 10 and the voltage across the shunt resistor RS are the capacitor C1.
  • the present invention is not limited to this.
  • the terminal voltage of the battery cell 10 and the voltage across the shunt resistor RS are directly input to the A / D converter 32. Also good.
  • the capacitor C1 is unnecessary. Thereby, since it is not necessary to charge the capacitor C1, the time required to detect the terminal voltage of the battery cell 10 and the voltage across the shunt resistor RS can be shortened.
  • the switching elements S11 and S12 are not necessary.
  • the switching element S12 is not necessary.
  • the switching elements S25 and S26 are not necessary. Thereby, since it is not necessary to switch the switching element, it is possible to shorten the time required for detecting the terminal voltage of the battery cell 10 and the voltage across the shunt resistor RS.
  • the polarity determination unit 20b calculates the voltage V1 of the node N3 and the voltage V2 of the node N4.
  • the polarity of the voltage between the node N3 and the node N4 is determined by comparison and a signal indicating the determination result is given to the processing unit 31, the present invention is not limited to this.
  • the polarity of the voltage between the node N1 and the node N2 is determined by comparing the voltage of the node N1 and the voltage of the node N2, and the signal indicating the determination result May be provided to the processing unit 31.
  • the detection unit 20 does not include the differential amplifier 20c, but is not limited thereto.
  • the detection unit 20 includes a differential amplifier 20c connected to differentially amplify the terminal voltage of the battery cell 10 and the voltage across the shunt resistor RS. May be. Thereby, even when the terminal voltage of the battery cell 10 and the voltage across the shunt resistor RS are small, the processing unit 31 can detect the terminal voltage of the battery cell 10 and the current flowing through the battery module 100 with sufficient accuracy. It becomes.
  • the detection unit 20 includes a differential amplifier 20c connected to differentially amplify the voltage across the shunt resistor RS. You may have. As a result, even when the voltage across the shunt resistor RS is smaller than the terminal voltage of the battery cell 10, the processing unit 31 can detect the current flowing through the battery module 100 with sufficient accuracy.
  • the processing unit 31 determines the terminal voltage of the battery cell 10. At the time of detection, a positive sign is added to the digital value provided by the A / D converter 32 without using the determination result of the polarity determination unit 20b, but the present invention is not limited to this. Similarly to the second embodiment (see FIG. 1), the processing unit 31 adds a positive sign to the digital value provided by the A / D converter 32 based on the determination result of the polarity determination unit 20b. Good.
  • the terminal voltage of the battery cell 10 and the voltage across the shunt resistor RS can be detected by the same algorithm.
  • the process of detecting the terminal voltage of the battery cell 10 and the current flowing through the battery module 100 can be simplified. Actually, the terminal voltage of the battery cell 10 does not become negative.
  • the detection unit 20 has a polarity determination unit 20b, and the polarity determination unit 20b has a voltage V1 at the node N3 and a voltage V2 at the node N4.
  • the polarity of the voltage between the node N3 and the node N4 is determined, but the present invention is not limited to this.
  • the detection unit 20 does not have the polarity determination unit 20b, and the processing unit 31 compares the first value with the second value, thereby the node N3. And the polarity of the voltage between the node N4 and the node N4 may be determined. In this case, the configuration of the detection unit 20 can be simplified.
  • the offset voltage by the offset unit 20g is added to the voltage between the nodes N1 and N2, so that a positive added voltage is input between the nodes N3 and N4.
  • the offset voltage by the offset unit 20g is not added to the voltage between the nodes N1 and N2, and the offset voltage by the offset unit 20g is added to the voltage between the nodes N3 and N4, so that the positive added voltage is converted into an A / D converter. 32 may be input. Even in this case, the current flowing through the battery module 100 can be detected using the unipolar A / D converter 32 during charging or discharging.
  • the voltage between the nodes N1 and N2 is rectified by the rectifier 20e and input between the nodes N3 and N4, but is not limited thereto.
  • the voltage between the nodes N1 and N2 may not be rectified by the rectifier 20e, and the voltage between the nodes N3 and N4 may be rectified by the rectifier 20e and input to the A / D converter 32. Even in this case, the current flowing through the battery module 100 can be detected using the unipolar A / D converter 32 during charging or discharging.
  • the battery module 100 includes the battery cells 10 having a plurality of substantially rectangular parallelepiped shapes, but is not limited thereto.
  • the battery module 100 may be configured by a plurality of cylindrical battery cells 10.
  • a shunt resistor RS connected in series to the plurality of battery cells 10 is used as an element that generates a voltage corresponding to the current flowing through the plurality of battery cells 10.
  • the present invention is not limited to this.
  • other elements such as a Hall element that generates a voltage corresponding to the current flowing through the plurality of battery cells 10 may be used.
  • the battery module 100 is housed in the casing CA, but is not limited thereto.
  • the battery module 100 may not be stored in the casing CA.
  • the gas duct 71 and the wiring member 70 are integrally provided on the lid member 80. Therefore, the wiring member 70, the gas duct 71, and the lid member 80 can be handled integrally. As a result, the battery module 100 can be easily assembled by attaching the lid member 80 to the battery block 10B.
  • bus bars 40, 40a and the electrodes 10a, 10b of the battery cell 10 by welding or screws. Further, the connection between the conductor lines 51 and 52 of the FPC board 50 and the bus bars 40 and 40a can be performed without complicating the wiring.
  • the battery cell 10 is an example of a battery cell
  • the shunt resistor RS is an example of an element
  • the detection circuit 30 is an example of a detection circuit
  • the A / D converter 32 is an analog-digital converter. It is an example.
  • the processing unit 31, the switching elements M10 to M29, and the polarity switching unit 20a are examples of the input processing unit.
  • the processing unit 31 is used.
  • the switching elements M10 to M29 and the switching unit 20f are examples of the input processing unit.
  • the battery modules 100, 100a to 100d are examples of battery modules
  • the battery system 500 is an example of a battery system
  • the battery ECU 101 is an example of a communication unit
  • the HV connector 520 is an example of a terminal unit.
  • the motor 602 is an example of a motor
  • the driving wheel 603 is an example of a driving wheel
  • the electric automobile 600 is an example of an electric vehicle.
  • a body 610, a ship hull, an aircraft fuselage, an elevator cage, or a torso of a walking robot are examples of the moving main body.
  • a foot is an example of a power source.
  • An electric vehicle 600, a ship, an aircraft, an elevator, or a walking robot are examples of moving objects.
  • the system controller 712 is an example of a system control unit
  • the power storage device 710 is an example of a power storage device
  • the power supply device 700 is an example of a power supply device
  • the power conversion device 720 is an example of a power conversion device.
  • the present invention can be effectively used for various mobile objects that use electric power as a drive source or mobile devices.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Sustainable Energy (AREA)
  • Sustainable Development (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

L'invention concerne un circuit de détection comprenant un convertisseur analogique-numérique et une unité de traitement. Des résistances de shunt sont connectées en série à plusieurs cellules de batterie. Le convertisseur analogique-numérique possède une polarité unique qui convertit une tension 0 ou plus en valeurs numériques. L'unité de traitement envoie sélectivement la tension de borne pour chaque cellule de batterie ainsi que la tension aux deux extrémités des résistances de shunt vers le convertisseur analogique-numérique. En outre, lorsque la tension aux deux extrémités des résistances de shunt est négative, l'unité de traitement convertit les tensions négatives en tension positives et les envoie vers le convertisseur analogique-numérique, ceci en inversant la polarité des tensions négatives à l'aide d'une unité de commutation de polarité.
PCT/JP2011/004060 2010-08-25 2011-07-15 Circuit de détection, module de batterie, système de batterie, véhicule électrique, corps mobile, dispositif de stockage électrique, et dispositif d'alimentation électrique Ceased WO2012026064A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010-188557 2010-08-25
JP2010188557 2010-08-25

Publications (1)

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WO2012026064A1 true WO2012026064A1 (fr) 2012-03-01

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110797965A (zh) * 2019-10-11 2020-02-14 中国直升机设计研究所 一种转电结构及方法
WO2022122626A1 (fr) * 2020-12-07 2022-06-16 Robert Bosch Gmbh Dispositif électronique pour outil électrique portatif
US11513157B2 (en) * 2020-02-12 2022-11-29 Microchip Technology Incorporated Measuring circuit using switched capacitors for measuring voltage and related systems, methods, and devices
WO2025191034A1 (fr) * 2024-03-15 2025-09-18 Hitachi Energy Ltd Équilibrage actif de stockage d'énergie de préférence au niveau d'un module et d'un bâti

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0442075A (ja) * 1990-06-06 1992-02-12 Sanyo Electric Co Ltd 容量表示回路
JPH0817478A (ja) * 1994-04-27 1996-01-19 Ngk Insulators Ltd 電力貯蔵用二次電池の充放電電流測定方法及び残存電力量測定方法並びに測定装置
JPH08146050A (ja) * 1994-11-25 1996-06-07 Fujitsu Ltd 差動増幅器を用いる測定装置
JP2002139522A (ja) * 2000-11-02 2002-05-17 Matsushita Electric Ind Co Ltd 積層電圧計測装置
JP2005061921A (ja) * 2003-08-08 2005-03-10 Hitachi Metals Ltd 信号電圧−時間変換回路及びそれを用いたセンサ装置
JP2006197765A (ja) * 2005-01-17 2006-07-27 Toyota Motor Corp 移動体の価格設定システムおよび価格設定方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0442075A (ja) * 1990-06-06 1992-02-12 Sanyo Electric Co Ltd 容量表示回路
JPH0817478A (ja) * 1994-04-27 1996-01-19 Ngk Insulators Ltd 電力貯蔵用二次電池の充放電電流測定方法及び残存電力量測定方法並びに測定装置
JPH08146050A (ja) * 1994-11-25 1996-06-07 Fujitsu Ltd 差動増幅器を用いる測定装置
JP2002139522A (ja) * 2000-11-02 2002-05-17 Matsushita Electric Ind Co Ltd 積層電圧計測装置
JP2005061921A (ja) * 2003-08-08 2005-03-10 Hitachi Metals Ltd 信号電圧−時間変換回路及びそれを用いたセンサ装置
JP2006197765A (ja) * 2005-01-17 2006-07-27 Toyota Motor Corp 移動体の価格設定システムおよび価格設定方法

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110797965A (zh) * 2019-10-11 2020-02-14 中国直升机设计研究所 一种转电结构及方法
CN110797965B (zh) * 2019-10-11 2023-04-28 中国直升机设计研究所 一种转电结构及方法
US11513157B2 (en) * 2020-02-12 2022-11-29 Microchip Technology Incorporated Measuring circuit using switched capacitors for measuring voltage and related systems, methods, and devices
WO2022122626A1 (fr) * 2020-12-07 2022-06-16 Robert Bosch Gmbh Dispositif électronique pour outil électrique portatif
WO2025191034A1 (fr) * 2024-03-15 2025-09-18 Hitachi Energy Ltd Équilibrage actif de stockage d'énergie de préférence au niveau d'un module et d'un bâti

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