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WO2013113236A1 - Dispositif de charge d'une batterie rechargeable - Google Patents

Dispositif de charge d'une batterie rechargeable Download PDF

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Publication number
WO2013113236A1
WO2013113236A1 PCT/CN2012/086825 CN2012086825W WO2013113236A1 WO 2013113236 A1 WO2013113236 A1 WO 2013113236A1 CN 2012086825 W CN2012086825 W CN 2012086825W WO 2013113236 A1 WO2013113236 A1 WO 2013113236A1
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WO
WIPO (PCT)
Prior art keywords
charging
mos transistor
module
current
charging device
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/CN2012/086825
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English (en)
Chinese (zh)
Inventor
樊晓微
周湘鲁
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.)
CSMC Technologies Fab1 Co Ltd
CSMC Technologies Fab2 Co Ltd
Original Assignee
CSMC Technologies Fab1 Co Ltd
CSMC Technologies Fab2 Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by CSMC Technologies Fab1 Co Ltd, CSMC Technologies Fab2 Co Ltd filed Critical CSMC Technologies Fab1 Co Ltd
Publication of WO2013113236A1 publication Critical patent/WO2013113236A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • H01M10/44—Methods for charging or discharging
    • H01M10/443—Methods for charging or discharging in response to temperature
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • H02J7/00718—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current in response to charge current gradient
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
    • 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

Definitions

  • the invention belongs to the technical field of secondary battery charging, and relates to a charging device for a secondary battery, and more particularly to a charging device with a constant temperature charging module and/or a constant current charging module.
  • Secondary batteries are widely used in various portable electronic devices (for example, notebook computers, mobile phones, digital music players, etc.), for example, various rechargeable nickel-cadmium (Ni-Cd) batteries, nickel-hydrogen (Ni- H) Battery, lithium-ion battery, nickel metal hydride (Nickel Metal-Hydride, Ni-H) batteries, etc., therefore, generally, corresponding secondary batteries are provided with corresponding charging devices.
  • Ni-Cd nickel-cadmium
  • Ni- H nickel-hydrogen
  • Li-ion battery lithium-ion battery
  • Ni-H nickel metal hydride
  • Ni-H nickel metal hydride batteries
  • the control drive portion of the charging device is typically implemented by an integrated circuit (IC) chip that is used to control the charging process.
  • IC integrated circuit
  • one of the objects of the present invention is to substantially achieve constant temperature charging control of the secondary battery to improve the service life of the secondary battery and the charging device, and to improve the charging efficiency.
  • Still another object of the present invention is to improve the safety and reliability of a charging device and a secondary battery.
  • the present invention provides a charging device for a secondary battery, comprising a main module of a charging control circuit and a main module of a logic control circuit, characterized in that it further comprises: a constant temperature charging module and/or a constant current charging module. ;
  • the thermostatic charging module is coupled to the main control module of the charging control circuit, and after the temperature of the charging device exceeds a predetermined temperature value during charging, the thermostatic charging module is configured to adjust and control the charging current to enable The charging device is substantially maintained at a predetermined temperature value;
  • the constant current charging module is coupled to the charging control circuit main module, and after the charging current exceeds a predetermined current value during charging, the constant current charging module is configured to adjust a control charging current to make it basic The ground is maintained at a predetermined current value.
  • the secondary battery is a secondary battery used in a mobile phone
  • the charging device is a universal charger adapted to charge a secondary battery used in a plurality of mobile phones.
  • a charging device includes a charging circuit of the secondary battery, and a driving MOS transistor for controlling a charging current of the secondary battery is disposed in the charging circuit;
  • the constant temperature charging module includes:
  • a first strobe transistor is controlled by an output of the first operational amplifier to selectively output a temperature feedback signal to a gate of the drive MOS transistor.
  • the triode is a PNP type triode, and an emitter of the triode is connected to a constant current source, and a base and a collector of the triode are grounded and have a negative
  • the emitter base voltage of the transistor of temperature coefficient is input to the first input of the first operational amplifier.
  • the second input terminal of the first operational amplifier is connected to the first reference voltage, and the size of the first reference voltage is set to determine the The predetermined temperature value.
  • the first strobe is a PMOS/NMOS transistor, and a gate and a drain of the PMOS/NMOS transistor are coupled to the first operational amplifier.
  • the output of the PMOS/NMOS transistor is coupled to the gate of the driving MOS transistor.
  • a charging device includes a charging circuit of the secondary battery, and a driving MOS transistor for controlling a charging current of the secondary battery is disposed in the charging circuit;
  • the constant current charging module includes:
  • a sampling MOS transistor for sampling a charging current in the charging circuit
  • a second strobe transistor is controlled by an output of the second operational amplifier to selectively output a charging current feedback signal to a gate of the driving MOS transistor and the sampling MOS transistor.
  • the constant current charging module further includes:
  • drain of the driving MOS transistor is connected to the first input end of the third operational amplifier, and the drain of the sampling MOS transistor is simultaneously connected to the second input end of the third operational amplifier and the third MOS a source of the transistor, an output of the third operational amplifier being coupled to a gate of the third MOS transistor.
  • the sampling MOS transistor is a MOS transistor that is scaled down relative to the driving MOS transistor.
  • the sampling MOS transistor and the driving MOS transistor are both PMOS transistors.
  • the voltage signal across the resistor is fed back to the two inputs of the second operational amplifier, and the first input of the second operational amplifier is A second reference voltage is input, and the predetermined current value is determined by setting a magnitude of the second reference voltage.
  • the second strobe is a PMOS/NMOS transistor, and a gate and a drain of the PMOS/NMOS transistor are coupled to the second operational amplifier.
  • the output of the PMOS/NMOS transistor is coupled to the gates of the driving MOS transistor and the sampling MOS transistor.
  • a charging device according to still another embodiment of the present invention, wherein the charging device further comprises:
  • Short circuit protection module and / or
  • the predetermined temperature value is about 120 °C.
  • the predetermined current value is about 500 mA.
  • the technical effect of the present invention is that, when the temperature of the charging device is too high, the charging current can be reduced in real time through the feedback loop in the thermostatic charging module, so that the charging device does not have repeated over-temperature phenomenon when the temperature is high, and The charging process is not interrupted, so that the subsequent charging process can be maintained at a predetermined temperature value for charging. Therefore, the charging efficiency is high, the life of the charged secondary battery is small, and the life of the charging device is long.
  • the "high current" constant current charging can be realized by the constant current charging module, so that the charging current is controlled at a safer predetermined current value in the subsequent charging process, thereby greatly improving the charging device and The safety and reliability of the secondary battery.
  • FIG. 1 is a schematic structural diagram of a functional module of an embodiment of a charging device of the prior art.
  • FIG. 2 is a block diagram showing the structure of a charging device in accordance with an embodiment of the present invention.
  • FIG. 3 is a schematic view showing a circuit configuration of a constant temperature charging module and a constant current charging module used in the charging device shown in FIG. 2.
  • FIG. 4 is a block diagram showing the structure of a charging device according to still another embodiment of the present invention.
  • FIG. 5 is a schematic diagram showing a circuit configuration of a constant temperature charging module used in the charging device shown in FIG. 4.
  • FIG. 5 is a schematic diagram showing a circuit configuration of a constant temperature charging module used in the charging device shown in FIG. 4.
  • FIG. 6 is a block diagram showing the structure of a charging device in accordance with still another embodiment of the present invention.
  • Fig. 7 is a view showing a circuit configuration of a constant current charging module used in the charging device shown in Fig. 6.
  • FIG. 1 is a schematic structural diagram of a functional module of a prior art charging device embodiment.
  • the charging device 10 is used to charge a secondary battery, and the secondary battery may specifically be a lithium battery used in a mobile phone terminal.
  • the drive control portion of the charging device 10 includes a plurality of functional module implementations, which can generally be implemented by an integrated circuit (IC).
  • the functional modules of the charging device 10 include a charging control circuit main module 110 and a logic control circuit main module 120.
  • the charging control circuit main module 110 is generally realized in the form of an analog circuit, and the output end thereof can be externally connected to the positive and negative electrodes of the secondary battery.
  • the charging control circuit main module 110 can realize the control of charging and stopping charging of the secondary battery, including battery positive charging, reverse charging, trickle charging when the battery voltage is too low, and output short circuit.
  • the control of the function such as charging is stopped;
  • the logic control circuit main module 120 is generally implemented in the form of a digital circuit for displaying various charging and protection states through the LED for the user to judge the state of charge of the battery.
  • the charging device 10 further includes the following functional modules:
  • a reference current and reference voltage module 111 for supplying a reference voltage and a reference current to the circuit.
  • a battery polarity detecting module 112 which is connected to the charging control circuit main module 110, through which the polarity of the charged secondary battery can be automatically recognized, and further controlled so that the secondary battery is in Whether the polarity is positive or reverse can enter the charging state.
  • the power-on power-on detection module 114 detects whether the power supply is correctly powered up to the secondary battery. When (V DD -V BAT ) is greater than a predetermined value (for example, 40 mV), it is considered that the power is correctly turned on, and there is a corresponding Indicator lights (such as LEDs) indicate.
  • a predetermined value for example, 40 mV
  • trickle charge detection module 117 when the power source is connected and the secondary battery is connected, if the secondary battery voltage is less than the precharge threshold voltage V MIN of the trickle charge (for example, about 2.5 V), for the secondary battery A small precharge current I PCHA (about 25 mA) is precharged (or called a trickle charge phase), and normal charging starts when the voltage of the secondary battery reaches V MIN ; therefore, the trickle charge detection module 117 uses It is detected whether the voltage of the secondary battery is less than the pre-charge threshold voltage, and outputs a control signal to the logic control circuit main module 120 to further control the pre-charging process.
  • V MIN the precharge threshold voltage
  • I PCHA about 25 mA
  • the charging saturation detecting module 116 when the power source is connected and the secondary battery is not full and the battery voltage is greater than V MIN , the power supply starts to normally charge the battery through the control of the chip, and the voltage across the secondary battery will gradually decrease. Raise, when the battery voltage rises to a voltage V S (about 4.20V) indicating that the battery is full, enters the constant voltage charging phase, the charging current gradually decreases, and when the charging current is less than the saturation off current I FULL , the battery is considered to be saturated and charged.
  • V S about 4.20V
  • the charge saturation detection module 116 is configured to detect whether the charging current is less than the saturation off current I FULL after the normal charging process (relative to the pre-charging process definition), and output a control signal to the logic control circuit main module 120 to further terminate Charging process.
  • the short circuit protection module 118 if a secondary battery short circuit occurs after the power source is connected, the charging device and the secondary battery may be burnt out; the short circuit protection module 118 is configured to detect whether the secondary battery is short-circuited, and The signal is output to the logic control circuit main module 120 to automatically reduce the charging current while giving a short circuit status indication.
  • An internal oscillator 115 which is coupled to the logic control circuit main module 120 for providing timing signals.
  • the over temperature protection module 113 if the temperature of the charging device (for example, the junction temperature of a certain junction in the chip) exceeds the over temperature protection threshold T O (for example, about 140 ° C), the over temperature protection module 113 outputs a control signal.
  • the normal charging state is resumed by automatically cutting off the charging current until the junction temperature drops to the over-temperature recovery threshold T R (eg, about 120 ° C).
  • the charging current is not limited until the secondary battery voltage reaches V s , and therefore, the large current of the charging process cannot be obtained. Effective current limiting, if an abnormality occurs during charging, it may cause excessive current, which affects the life and safety of the charging device and the secondary battery.
  • the charging process of the secondary battery can be generally divided into a pre-charging process and a normal charging process, and enters a normal charging process after the pre-charging process ends; in the pre-charging process, generally a smaller pre-charging current is used for charging; During the charging process, if the voltage difference between the power-on voltage (such as V DD shown in Figure 3) and the secondary battery is too large, or if an abnormality occurs, the charging current may be very large.
  • FIG. 2 is a block diagram showing the structure of a charging device according to an embodiment of the invention.
  • the charging device 70 is for charging a secondary battery (for example, a lithium battery) used in a mobile phone.
  • a secondary battery for example, a lithium battery
  • the structural parameters of the secondary battery are also different due to differences in various types of mobile phones; in order to achieve compatibility with charging of secondary batteries of various mobile phone models, the charging device 70 may preferably be a universal charger.
  • the charging device 70 also includes a charging control circuit main module 110 and a logic control circuit main module 120 of the embodiment shown in FIG. 1.
  • the charging device 70 is provided with a constant temperature charging module 330.
  • the constant temperature charging module 330 can output a signal to the charging control circuit main module 110, which is different from the working principle of the over-temperature protection module 113 shown in FIG. 1 , when the ambient temperature of the charging device 70 is too high or the charging current is too large.
  • the constant temperature charging module 330 can thereafter feedback the temperature signal and reduce the charging current in real time, thereby
  • the temperature of the charging device 70 can be made substantially constant at the predetermined temperature value (e.g., 120 ° C), thereby achieving a constant temperature charging process thereafter, and does not frequently occur beyond the predetermined temperature value. Therefore, the constant temperature charging module 330 does not interrupt the charging process because the temperature is too high during the charging process, but adjusts the charging current according to the temperature feedback in real time, and then the temperature of the charging process is substantially constant at the safe predetermined temperature value.
  • the lifespan of the charging device and the secondary battery are not interrupted, the life is long, and the charging efficiency is high.
  • the charging device 70 is further provided with a constant current charging module 540, and the constant current charging module 540 can also output a signal to the charging control circuit main module 110; during the normal charging process, if the power is turned on (for example, as shown in FIG. 3) The voltage difference between the V DD ) and the secondary battery is too large, or if an abnormality occurs, the charging current may be very large; by the constant current charging module 540, a predetermined current value that makes the charging device and the secondary battery relatively safe may be set.
  • the predetermined current value is generally relative to the current greater than the normal charging process and is therefore also referred to as "high current.”
  • the constant current charging module 540 starts operating to reduce the charging current and substantially maintain the constant current charging, that is, "high current” constant current charging.
  • the magnitude of "high current” i.e., predetermined current value
  • the magnitude of the predetermined current value is in the order of magnitude of 100 mA to 1000 mA, for example, “high current” is substantially set to 500 mA. It should be understood by those skilled in the art that the magnitude of the predetermined current value may be set according to a specific situation.
  • the charging device and the charged secondary battery should be relatively safe;
  • the "flow" is also a relative concept, and the error range of the current magnitude is well known to those skilled in the art, and may continue to narrow the error range as the charging technology develops.
  • the constant current charging module 330 is provided with a constant current source Ib , and the current of the constant current source Ib is input to the emitter (E) of the series connected transistor Q1, and the base and the emitter of the transistor Q1 are simultaneously grounded.
  • the transistor Q1 is a PNP type transistor, and the emitter base voltage Vbe of the transistor Q1 has a negative temperature coefficient. Therefore, it can be used to sample the temperature signal of the chip where the feedback transistor Q1 is located, that is, the sampling charging device. Temperature signal. As the chip temperature changes, Vbe changes with temperature.
  • V be (ie, point B voltage) is input to the negative ("-") input terminal of the operational amplifier OA1 of the constant temperature charging module 330, and the positive ("+") input terminal of the operational amplifier OA1 is connected to the reference voltage V ref1 . Therefore, when V ref1 of the input terminal of the operational amplifier OA1 is greater than V be , OA1 outputs a positive voltage; otherwise, OA1 outputs a negative voltage.
  • the output of the operational amplifier OA1 is used to control the on and off of the MOS transistor M3 to selectively output a temperature feedback signal.
  • the MOS transistor M3 is an NMOS transistor whose drain (D) and gate (G) are simultaneously connected to the output terminal of the operational amplifier OA1, and therefore, the MOS transistor M3 is connected in the form of a diode.
  • the source of the MOS transistor M3 is further connected to the gate of the driving MOS transistor M1 (in this example, M1 is a PMOS transistor) of the charging circuit of the charging device, so that the charging current I 1 in the charging circuit can be controlled.
  • the basic working principle of the constant temperature charging module 330 is as follows:
  • the charging current I 1 of the charging circuit is too large, relatively large heat is generated to cause the temperature of the entire chip to rise (that is, the temperature of the charging device is increased), and the junction temperature of the transistor Q1 is increased synchronously, V. Be decreases; when V be decreases to less than the reference voltage V ref1 , OA1 outputs a positive voltage, the MOS transistor M3 connected in the form of a diode is turned on, and the on current of the driving MOS transistor M1 is decreased, that is, the charging current is reduced. 1 , so that the negative feedback loop formed by the thermostatic charging module 330 can work normally.
  • the specific predetermined temperature value may be set by the value of the V ref1 value.
  • the predetermined temperature value may be selected to be about 120 ° C.
  • V be when the whole chip temperature does not exceed the predetermined temperature value, V be will be greater than the reference voltage V ref1 , OA1 outputs a negative voltage, the diode-connected MOS transistor M3 is turned off, and the constant temperature charging module 330 cannot achieve the negative feedback loop operation.
  • the charging current I 1 continues to remain constant or continues to rise. At this time, the constant temperature charging module 330 does not operate, and the charging device can perform normal charging at a temperature below the predetermined temperature value.
  • control principle process of the circuit shown in FIG. 3 can be implemented by other conversion forms of the circuit.
  • the MOS transistor M3 is replaced by a diode, and other devices having the function of sampling the temperature signal can also be used instead of the triode;
  • the skilled person can make various modifications and equivalent replacements according to the principle of the circuit structure of the constant temperature charging module 330 shown in FIG. 2 above.
  • the constant current charging module 540 is provided with a sampling MOS transistor M2, which is the same type of transistor as the driving MOS transistor M1.
  • both are PMOS transistors; and, the sampling MOS transistor M2 is structurally a MOS transistor scaled down relative to the driving MOS transistor M1.
  • the source (S) is connected to the voltage V dd , and the gate (G) is connected to the same potential (that is, the voltage at point B). Therefore, the sampling MOS
  • the drain (D) of transistor M2 outputs current I 2 to enable sampling of charging current I 1 .
  • the constant current charging module 540 is further provided with an operational amplifier OA3 and a MOS transistor M4; the positive ("+") input terminal of the operational amplifier OA3 is connected to the drain of the driving MOS transistor M1, and the negative ("-") input terminal of the operational amplifier OA3 is connected.
  • the drain of the sampling MOS transistor M2 is connected; at the same time, the drain of the sampling MOS transistor M2 is connected to the source of the MOS transistor M4, and the gate of the MOS transistor M4 is controlled by the output terminal of the operational amplifier OA3.
  • the operational amplifier OA3 and the MOS transistor M4 can together form a negative feedback regulator circuit
  • the drain of the sampling MOS transistor M2 is exactly equal to the driving voltage of the drain of the MOS transistor M1 charging circuit of the charging device
  • the charging current I 2 is implemented the current I 1 accurate sampling . Therefore, I 2 can be calculated by the following relation (1):
  • N is the current sampling scale factor
  • the drain of the MOS transistor M4 is connected in series with the resistor R, and the point C is located between the resistor R and the MOS transistor M4, so the voltage V c at the point C is calculated by the following relation (2):
  • the voltage V c at point C is further input to the positive ("+") input terminal of the operational amplifier OA2, and the negative ("-") input terminal of the operational amplifier OA2 is input with the reference voltage V ref2 ; therefore, when the input terminal of the operational amplifier OA2 is V When c is greater than V ref 2 , the operational amplifier OA2 outputs a positive voltage; otherwise, the operational amplifier OA2 outputs a negative voltage.
  • the output of the operational amplifier OA2 is used to control the turn-on and turn-off of the MOS transistor M5.
  • the MOS transistor M5 is an NMOS transistor, and the drain (D) and the gate (G) are simultaneously connected to the output of the operational amplifier OA2. Therefore, the MOS transistor M5 is connected in the form of a diode.
  • the source of the MOS transistor M5 outputs a feedback signal based on the charging current to the gates of the driving MOS transistor M1 and the sampling MOS transistor M2, that is, point B.
  • high current ie, a predetermined current value
  • the predetermined current value is determined by the input voltage V ref2 of the input terminal of the negative ("-") input terminal of the operational amplifier OA2, and the predetermined current can be set by setting V ref2 . Value (for example, 500 mA).
  • the reference voltages V ref1 , V ref2 and the constant current source I b may be specifically provided by the reference voltage and reference current module 111 shown in FIG. 2.
  • Point B is also connected to the charging control circuit main module 110.
  • the charging device 70 further includes the following functional modules:
  • a reference current and reference voltage module 111 for supplying a reference voltage and a reference current to the circuit.
  • a battery polarity detecting module 112 which is connected to the charging control circuit main module 110, through which the polarity of the charged secondary battery can be automatically recognized, and further controlled so that the secondary battery is in Whether the polarity is positive or reverse can enter the charging state.
  • the power-on power-on detection module 114 detects whether the power supply is correctly powered up to the secondary battery. When (V DD -V BAT ) is greater than a predetermined value (for example, 40 mV), it is considered that the power is correctly turned on, and there is a corresponding Indicator lights (such as LEDs) indicate.
  • a predetermined value for example, 40 mV
  • trickle charge detection module 117 when the power source is connected and the secondary battery is connected, if the secondary battery voltage is less than the precharge threshold voltage V MIN of the trickle charge (for example, about 2.5 V), for the secondary battery A small current precharge current I PCHA (about 25 mA) is precharged (or called a trickle charge phase), and normal charging begins when the voltage of the secondary battery reaches V MIN . Therefore, the trickle charge detection module 117 is configured to detect whether the voltage of the secondary battery is less than the precharge threshold voltage, and output a control signal to the logic control circuit main module 120 to further control the precharge process.
  • V MIN the precharge threshold voltage
  • I PCHA about 25 mA
  • the charging saturation detecting module 116 when the power source is connected and the secondary battery is not full and the battery voltage is greater than V MIN , the power supply starts to normally charge the battery through the control of the chip, and the voltage across the secondary battery will gradually decrease. Raise, when the battery voltage rises to a voltage V S (about 4.20V) indicating that the battery is full, enters the constant voltage charging phase, the charging current gradually decreases, and when the charging current is less than the saturation off current I FULL , the battery is considered to be saturated and charged. End.
  • V S about 4.20V
  • the charge saturation detection module 116 is configured to detect whether the charging current is less than the saturation off current I FULL after the normal charging process (relative to the precharge process definition), and output a control signal to the logic control circuit main module 120 to further terminate the charging process. .
  • the short circuit protection module 118 if a secondary battery short circuit occurs after the power source is connected, the charging device and the secondary battery may be burnt out; the short circuit protection module 118 is configured to detect whether the secondary battery is short-circuited, and The signal is output to the logic control circuit main module 120 to automatically reduce the charging current while giving a short circuit status indication.
  • An internal oscillator 115 which is coupled to the logic control circuit main module 120 for providing timing signals.
  • FIG. 4 is a block diagram showing the structure of a charging device according to still another embodiment of the present invention
  • FIG. 5 is a schematic view showing a circuit configuration of a constant temperature charging module used in the charging device shown in FIG. 4. 4 and 2, the charging device 30 is opposite to the charging device 70, in which the constant current charging module 540 is not provided, and therefore, the charging device 30 does not have a "high current" constant current charging function.
  • the charging device 30 has a constant temperature charging function compared to the charging device 10 of the embodiment shown in FIG. 1, avoiding the phenomenon of repeated over-temperature during charging, and can adjust the charging current according to the temperature in real time, the charging device and The service life of the secondary battery is not interrupted, the life is long, and the charging efficiency is high.
  • the functions of the constant temperature charging module 330 are basically the same.
  • the circuit structure of the constant temperature charging module shown in FIG. 5 is basically the same as that of the constant temperature charging module shown in FIG. 3, and the working principle is basically the same. I will not repeat them here.
  • FIG. 6 is a block diagram showing a structure of a charging device according to still another embodiment of the present invention
  • FIG. 7 is a schematic view showing a circuit configuration of a constant current charging module used in the charging device shown in FIG. 6. 6 and FIG. 2, the charging device 50 is opposite to the charging device 70, wherein the thermostatic charging module 330 is not provided, and therefore, the charging device 50 does not have a constant temperature charging function.
  • the charging device 50 is provided with a constant current charging module 540, which can perform "high current" constant current charging during normal charging, and the charging current is set at A safe predetermined value improves the safety and reliability of the secondary battery and its charging device.
  • the functions of the constant current charging module 540 are basically the same.
  • the circuit structure of the constant current charging module shown in FIG. 7 is basically the same as the circuit structure of the constant current charging module shown in FIG. They are basically the same, and will not be repeated here.
  • the respective functional modules included therein can be implemented on one IC chip.
  • connection mentioned in the above embodiments may refer to a direct connection between the two, but those skilled in the art should understand that, without affecting the basic functions of the circuit, “ Elements or components that are “connected” may also be inserted between other components or components (the components or components that are inserted into the connection do not alter the signal transmission between the "connected” components or components). Therefore, “coupled” herein may refer to either a direct connection or an indirect coupling connection.
  • the above examples mainly illustrate the charging device of the secondary battery of the present invention.
  • the NMOS transistor is replaced with a PMOS.
  • the transistor and the PMOS transistor are replaced by NMOS transistors, and the signals at the input terminals of the operational amplifiers are exchanged accordingly.
  • the present invention is to be construed as illustrative and not restrictive, and the invention may cover various modifications without departing from the spirit and scope of the invention as defined by the appended claims With replacement.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
PCT/CN2012/086825 2012-02-03 2012-12-18 Dispositif de charge d'une batterie rechargeable Ceased WO2013113236A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201210024001.0 2012-02-03
CN201210024001.0A CN103248074B (zh) 2012-02-03 2012-02-03 一种二次电池的充电装置

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CN108001246A (zh) * 2016-11-01 2018-05-08 郑州宇通客车股份有限公司 一种电动汽车直流充电系统及其充电控制方法
CN109038741A (zh) * 2018-08-16 2018-12-18 上海艾为电子技术股份有限公司 一种充电电路和开关充电芯片及其充电电流采样电路
CN110890775A (zh) * 2019-12-26 2020-03-17 上海派能能源科技股份有限公司 一种隔离型可设置限流模块
CN115864604A (zh) * 2023-01-31 2023-03-28 深圳市思远半导体有限公司 充电电路、电源提供设备、被充电设备及充电系统

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CN108110854B (zh) * 2018-01-16 2021-06-22 北京小米移动软件有限公司 充电方法、装置及计算机可读存储介质
CN109378873B (zh) * 2018-11-02 2022-05-31 上海芯凌微电子有限公司 一种电池充电系统及充电方法
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CN107465217A (zh) * 2016-06-03 2017-12-12 深圳市富满电子集团股份有限公司 一种无需电流采样电阻的开关型锂电池充电电路及芯片
CN107465217B (zh) * 2016-06-03 2023-03-21 富满微电子集团股份有限公司 一种无需电流采样电阻的开关型锂电池充电电路及芯片
CN108001246A (zh) * 2016-11-01 2018-05-08 郑州宇通客车股份有限公司 一种电动汽车直流充电系统及其充电控制方法
CN108001246B (zh) * 2016-11-01 2023-08-01 宇通客车股份有限公司 一种电动汽车直流充电系统及其充电控制方法
CN109038741A (zh) * 2018-08-16 2018-12-18 上海艾为电子技术股份有限公司 一种充电电路和开关充电芯片及其充电电流采样电路
CN109038741B (zh) * 2018-08-16 2023-11-28 上海艾为电子技术股份有限公司 一种充电电路和开关充电芯片及其充电电流采样电路
CN110890775A (zh) * 2019-12-26 2020-03-17 上海派能能源科技股份有限公司 一种隔离型可设置限流模块
CN115864604A (zh) * 2023-01-31 2023-03-28 深圳市思远半导体有限公司 充电电路、电源提供设备、被充电设备及充电系统

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