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WO2025089078A1 - Dispositif de stockage d'électricité, système de stockage d'électricité, procédé de commande et programme - Google Patents

Dispositif de stockage d'électricité, système de stockage d'électricité, procédé de commande et programme Download PDF

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Publication number
WO2025089078A1
WO2025089078A1 PCT/JP2024/036194 JP2024036194W WO2025089078A1 WO 2025089078 A1 WO2025089078 A1 WO 2025089078A1 JP 2024036194 W JP2024036194 W JP 2024036194W WO 2025089078 A1 WO2025089078 A1 WO 2025089078A1
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Prior art keywords
storage battery
circuit
storage
discharge
power
Prior art date
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Pending
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PCT/JP2024/036194
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English (en)
Japanese (ja)
Inventor
一 岩井
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Omron Corp
Original Assignee
Omron Corp
Omron Tateisi Electronics Co
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Publication of WO2025089078A1 publication Critical patent/WO2025089078A1/fr
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • 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
    • H02J1/00—Circuit arrangements for DC mains or DC distribution networks
    • 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
    • H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
    • 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 present invention relates to a power storage device in which multiple storage batteries are connected in parallel, a power storage system, and a control method and program for the power storage device.
  • Patent Documents 1 and 2 there are technologies that switch between a battery among a plurality of storage batteries to be discharged (e.g., Patent Documents 1 and 2, etc.), technologies that provide power conversion units (inverters and converters) corresponding to each of a plurality of storage batteries within a power conversion device (PCS: Power Conditioning System) (e.g., Patent Document 3, etc.), and technologies that provide DC/DC converters corresponding to each of a plurality of storage batteries (e.g., Patent Documents 4 to 6, etc.).
  • PCS Power Conditioning System
  • Patent Documents 1 and 2 have the problem that when switching between storage batteries, there are times when none of the storage batteries are connected, resulting in periods when the power supply from the storage batteries is cut off (discontinuous discharging). Also, when charging, it is necessary to create a state in which none of the storage batteries are connected to the PCS, and then switch to the storage battery to be charged. For this reason, if a power outage or the like occurs when switching between storage batteries for charging, it is not possible to immediately transition from charging to discharging, and if a power outage or the like occurs during charging, only the storage capacity remaining in the storage battery being charged can be used (or discharging must be stopped temporarily and switched to another storage battery).
  • Patent Document 3 requires a power conversion unit to be provided for each storage battery (i.e., according to the number of storage batteries), which causes the problem of increasing the size and cost of the PCS.
  • the technologies described in Patent Documents 4 to 6 also require a DC/DC converter to be provided for each storage battery, which causes problems such as increasing the size and cost of the power storage device, and requiring simultaneous and appropriate control of multiple DC/DC converters, which makes the control extremely complicated.
  • the present invention was made in consideration of the above situation, and its purpose is to provide a technology that prevents increases in product size and cost and eliminates the need for complex control in a power storage device that connects multiple storage batteries in parallel.
  • the present invention adopts the following configuration.
  • a power storage device in which a plurality of storage batteries are detachably connected in parallel,
  • Each of the discharge circuits is an electrical storage device configured to prevent reverse flow of electrical power to the corresponding battery.
  • the storage device may also be configured to prevent reverse flow of power to the corresponding storage battery by providing a diode in each of the discharge circuits.
  • the discharge circuit and the charge circuit are each provided with a switching element
  • the control means When discharging from the storage battery, control is performed so that the switching elements of all the discharging circuits are in a short-circuit state and the switching elements of all the charging circuits are in an open state; When charging the storage batteries, control may be performed so that the switching element of the charging circuit corresponding to any one of the storage batteries is short-circuited, and the switching element of the charging circuit corresponding to the other storage batteries is open.
  • the switching element provided in the discharge circuit may be of a normally closed type
  • the switching element provided in the charge circuit may be of a normally open type.
  • the power storage device further includes an ammeter for each of the storage batteries that measures a charge/discharge current of the storage batteries,
  • the control means When charging of the storage batteries is started, the presence or absence of an abnormality in the normally closed switching element corresponding to the storage batteries other than the one being charged may be determined based on the current values output by each of the ammeters.
  • the storage battery device further includes a voltmeter that measures a voltage of a circuit to which the plurality of storage batteries are connected,
  • the control means When charging of the storage battery is completed, the presence or absence of an abnormality in the normally open switching element corresponding to the storage battery to be charged may be determined based on the voltage value output by the voltmeter.
  • the switching element provided in the discharge circuit may be a semiconductor switching element.
  • a soft start may be performed by PWM controlling the semiconductor switching element.
  • a high-speed switching element such as an IGBT (Insulated Gate Bipolar Transistor) can be used. In this way, it is possible to reduce the rush current to the PCS internal capacitor that occurs due to the voltage difference between the batteries when the switching element of the discharge circuit is short-circuited after or during charging.
  • IGBT Insulated Gate Bipolar Transistor
  • the storage device may also be configured to include a main body having the control means, and a plurality of storage battery modules having the storage batteries and the corresponding discharge circuits and charge circuits, and configured to be detachable from the main body.
  • a reactance may be provided on the main circuit to which the multiple storage batteries are connected. This makes it possible to reduce the rush current to the PCS internal capacitor that occurs when the discharge circuit switching element is short-circuited.
  • the present invention also provides a method for controlling an electricity storage device in which a plurality of storage batteries are connected in parallel, a discharge circuit and a charge circuit corresponding to each of the storage batteries are provided, and the discharge circuit and the charge circuit are each provided with an opening/closing element, and the discharge circuit is provided with a diode for preventing a reverse flow of power to the storage batteries, a first step of opening the switching elements of all the charging circuits and shorting the switching elements of all the discharging circuits; A second step of selecting one storage battery to be charged from the plurality of storage batteries; a third step of opening the switching element of the discharge circuit corresponding to at least one storage battery other than the one storage battery selected in the second step; a fourth step of shorting the switching element of the charging circuit corresponding to one of the storage batteries selected in the second step; A fifth step of supplying power to one of the storage batteries selected in the second step; a sixth step of opening the switching element of the charging circuit corresponding to one of the storage batteries selected in the second step after the fifth step;
  • the power storage device includes an ammeter for each of the storage batteries that measures a value of a charge/discharge current of the storage battery,
  • the switching element provided in the discharge circuit is a normally closed type
  • the switching element provided in the charging circuit is a normally open type
  • the storage device includes a voltmeter that measures a voltage of a main circuit to which the plurality of storage batteries are connected,
  • the switching element provided in the discharge circuit is a normally closed type
  • the switching element provided in the charging circuit is a normally open type
  • the present invention can also be seen as a program for causing a computer to execute each of the above methods, or as a computer-readable recording medium on which such a program is non-temporarily recorded.
  • the present invention provides technology that prevents increases in product size and cost and eliminates the need for complex control in a power storage device that connects multiple storage batteries in parallel.
  • FIG. 1 is a diagram showing a schematic configuration of a power storage system according to an embodiment.
  • FIG. 2 is a diagram showing a transition of an output voltage from each storage battery during discharging of the power storage system according to the embodiment.
  • FIG. 3 is a first flowchart illustrating an example of a flow of a process performed by the BMS during a charging operation according to the embodiment.
  • FIG. 4 is a second flowchart illustrating an example of the flow of processing performed by the BMS during a charging operation according to the embodiment.
  • FIG. 5 is a schematic diagram showing a first modified example of the embodiment.
  • FIG. 6 is a schematic diagram showing a second modified example of the embodiment.
  • FIG. 7 is a schematic diagram showing a third modified example of the embodiment.
  • FIG. 1 is a diagram showing a schematic configuration of a power storage system according to an embodiment.
  • FIG. 2 is a diagram showing a transition of an output voltage from each storage battery during discharging of the power storage system according to the embodiment.
  • FIG. 8 is a schematic diagram showing a fourth modified example of the embodiment.
  • FIG. 9 is a schematic diagram showing a fifth modified example of the embodiment.
  • FIG. 10 is a flowchart showing a part of a flow of a process performed by the BMS when diagnosing a discharge circuit relay according to the sixth modified example of the embodiment.
  • FIG. 11 is a flowchart illustrating a part of a flow of a process performed by the BMS when diagnosing a charging circuit relay according to the seventh modified example of the embodiment.
  • Fig. 1 is a schematic diagram showing a power storage system 100 that has a storage battery unit 101, a PCS 90, and a solar power generation panel 3, and is interconnected with a commercial power system (hereinafter simply referred to as a system) 2.
  • a system commercial power system
  • the storage battery unit 101 is a power storage device including a main body 10 and storage battery modules 20a, 20b, and 20c, each of which is configured to be detachable from the main body 10. Note that, although this specification describes three storage battery modules 20a, 20b, and 20c connected to the main body 10, the number of storage battery modules actually connected to the main body 10 may be two or less, or four or more.
  • the main body 10 includes a BMS (Battery Management System) 11 as a control means for controlling each of the connected storage battery modules 20a, 20b, and 20c, a power supply circuit 12 for supplying power to the BMS 11, a main body circuit relay 13, a reactance 14 for reducing rush current to a capacitor (not shown) inside the PCS 90, a circuit breaker 15, and a connection terminal for connecting to the PCS 90.
  • BMS Battery Management System
  • the battery module 20a is configured to house, in a housing (not shown), a battery 1a, such as a lithium ion battery, a discharge circuit 21a through which a discharge current from the battery 1a flows, a charge circuit 22a through which a charge current flows to the battery 1a, a voltmeter V1 that measures the output voltage of the battery 1a, an ammeter A1 that measures the current flowing in the battery module 20, and a fuse.
  • the discharge circuit 21a is provided with a diode 23a that prevents reverse flow of power to the battery 1a, and a normally closed discharge circuit relay 24a.
  • the charge circuit 22a is provided with a normally open charge circuit relay 25a.
  • the diode 23a and the discharge circuit relay 24a of the discharge circuit 21a are configured to be in parallel with the part of the charge circuit 22a where the charge circuit relay 25a is provided.
  • Battery modules 20b and 20c are configured similarly to battery module 20a, and each includes a battery (1b, 1c), a discharge circuit (21b, 21c), a charge circuit (22b, 22c), a diode (23b, 23c), a discharge circuit relay (24b, 24c), and a charge circuit relay (25b, 25c).
  • a battery 1b, 1c
  • a discharge circuit 21b, 21c
  • a charge circuit 22b, 22c
  • a diode 23b, 23c
  • a discharge circuit relay 24b, 24c
  • charge circuit relay 25b, 25c
  • the BMS 11 acquires information on the voltage and current values of each storage battery 1, and outputs control signals to open and close the discharge circuit relays 24 and charge circuit relays 25 of each storage battery module 20.
  • the control circuit 91 of the PCS 90 to which the storage battery unit 101 is connected controls the DC/DC converter 93 based on commands from the BMS 11, and appropriate charging and discharging operations of the storage battery unit 101 are performed.
  • the above-described configuration of the storage battery unit 11 makes it possible to connect multiple storage batteries 1 (storage battery modules 20) in parallel and use them without providing a DC/DC circuit for each storage battery 1.
  • FIG. 1 is a schematic diagram showing a schematic configuration of a power storage system 100 according to this embodiment.
  • the power storage system 100 is a grid-connected system that has a storage battery unit 101, a PCS 90, and a photovoltaic power generation panel 3 similar to those described in the application example, and is connected to a grid 2 and a load (not shown). Note that the configuration of the storage battery unit 101 has already been described in the application example, so a repeated description will be omitted.
  • the energy storage system 100 receives (purchases) power from the grid 2 during times when electricity rates are low, such as at night, converts the power from AC to DC in the PCS 90, outputs it to the storage battery unit 101, and charges the storage battery 1.
  • the energy storage system 100 includes a solar power generation panel 3, solar-generated power is also transmitted to the PCS 90 via the DC/DC converter 4, and this power can also be used to charge the storage battery 1.
  • the storage battery 1 has a remaining power capacity equal to or greater than a predetermined value, it can discharge power from the storage battery 1 and supply it to a load (not shown) connected to the grid via the PCS 90.
  • the PCS 90 is a so-called hybrid power conditioner, and is connected to the storage battery unit 101 and the photovoltaic power generation panel 3 (via the DC/DC converter 4).
  • the PCS 90 has a control circuit 91 that controls the entire PCS 90, a power supply circuit 92 that supplies power to the control circuit 91, a DC/DC converter 93, and an inverter 94.
  • the charge and discharge operation (current value and charge/discharge time) of the storage battery unit 101 is determined by the control circuit 91 controlling the DC/DC converter 93.
  • the PCS 90 in this embodiment corresponds to the power conversion device according to the present invention.
  • Fig. 2 is a graph showing the transition of the output voltage of each storage battery 1 connected to the storage battery unit 101 when discharging from the storage battery unit 101.
  • the charging circuit relays 25 of all connected storage battery modules 20 are opened, and the discharging circuit relays 24 are shorted.
  • each storage battery module 20 is connected in parallel, when discharging operation is started under the control of the PCS 90, even if the OCVs of the storage batteries 1 are different, only the storage battery 1 with the highest OCV will supply power to the PCS 90 first.
  • FIG. 2 an example will be described in which, at the start of discharging, storage battery 1a has the highest OCV, followed by storage battery 1b with storage battery 1c having the lowest OCV.
  • Fig. 3 and Fig. 4 are flowcharts showing a process flow when charging the storage battery 1 connected to the storage battery unit 101 according to the present embodiment.
  • the BMS 11 determines whether the open/closed state of each discharge circuit relay 24 and each charge circuit relay 25 of each storage battery module 20 is in a discharge standby state, i.e., whether all discharge circuit relays 24 are shorted and all charge circuit relays 25 are open (S101). If it is determined that they are not in a standby state, the BMS 11 opens all discharge circuit relays 24 and charge circuit relays 25 to enter a discharge standby state (S102), and proceeds to step S103. On the other hand, if it is determined in step S101 that they are in a discharge standby state, the BMS 11 proceeds directly to step S103.
  • step S103 the BMS 11 selects the storage battery 1 with the lowest SOC from among the connected storage batteries 1 (S103).
  • the storage battery 1a of the storage battery module 20a is the storage battery with the lowest SOC.
  • the discharge circuit relays 24b, 24c corresponding to all storage batteries 1b, 1c other than the selected storage battery 1a are opened (S104).
  • the PCS 90 controls the DC/DC converter 93 to match the supply voltage to the OCV (output value of V1) of the storage battery 1a to be charged (S105). After that, the BMS 11 shorts the charging circuit relay 25a corresponding to the selected storage battery 1a (S106).
  • the BMS 11 monitors the voltage value (output value of V1) and current value (output value of A1) of the storage battery 1a to be charged, and based on a command from the BMS 11, the control circuit 91 of the PCS 90 controls the DC/DC converter 93 to control the charging current while charging the storage battery 1a (S107).
  • the PCS 90 monitors whether a reason to interrupt charging (such as a power outage) occurs during charging of the storage battery 1a (S108), and if it determines that a reason to interrupt charging has occurred, the PCS 90 controls the storage battery 1a, which had been charging up until that point (i.e., the charging circuit relay 25a is short-circuited), to start discharging (s109).
  • the BMS 11 then opens the charging circuit relay 25a (S110), switching the discharge from the storage battery 1a to discharging via the discharge circuit relay 24a, which has been maintained in a short-circuited state. That is, at the timing of step S109, discharging via the charging circuit relay 25a may occur instantaneously, but since the charging circuit relay 25a is immediately opened, discharging from the storage battery 1a occurs seamlessly.
  • the BMS 11 shorts the discharge circuit relays 24b, 24c corresponding to the storage batteries 1b, 1c that were not being charged (S111), and transitions to normal discharge operation in which all discharge circuit relays 24 are shorted and all charge circuit relays 25 are open.
  • step S108 storage battery 1a is charged to an SOC of 100%, and then BMS 11 opens charging circuit relay 25a (S112).
  • BMS 11 determines whether to charge another storage battery (1b or 1c) based on the SOC of each storage battery 1 and predetermined rules (S113). If it determines to charge another storage battery (1b or 1c), it selects the storage battery 1 with the lowest SOC and shorts the discharge circuit relay 24 corresponding to that storage battery 1 (S114), and then returns to step S104 to repeat the subsequent processes.
  • step S113 determines whether other rechargeable batteries are to be charged. If it is determined in step S113 that no other rechargeable batteries are to be charged, the discharge circuit relays 24 corresponding to all storage batteries 1 are short-circuited to transition to a discharge standby state (S115), and the series of routines is terminated.
  • the storage battery unit 101 configured as described above and the control method for the storage battery unit 101 make it possible to perform continuous discharge operation for the remaining capacity of all connected storage batteries 1 based on the OCV of each storage battery 1 connected in parallel, without the need for complex control. Also, even during charging, one of the storage batteries 1 is always connected to the PCS 90 via the diode 23, so that even if charging is suddenly stopped and a discharge operation is started, for example, during a power outage, a discharge operation can be started immediately without loss of switching time.
  • the storage capacity can theoretically be increased as much as desired by adding more storage battery modules 20, and since the SOH and OCV of the storage batteries 1 used in the storage battery modules 20 do not need to be the same, it is possible to add new storage batteries 1 or, conversely, use second-hand storage batteries 1, which contributes to resource conservation.
  • the storage battery unit 101 and the energy storage system 100 according to the above-mentioned embodiment 1 are merely examples of embodiments of the present invention, and various modified examples can be adopted as described below. Note that, below, the same reference numerals are used for configurations and processes similar to those of the energy storage system 100 according to embodiment 1, and repeated explanations will be omitted.
  • ⁇ Modification 1> 5 is a schematic diagram showing a power storage system 200 according to a first modified example.
  • the internal configuration of the storage battery modules 30a, 30b, and 30c in a storage battery unit 201 is different from that of the first embodiment.
  • the other configurations are the same as those of the power storage system of the first embodiment.
  • the discharge circuit 31a and the charge circuit 32a partially share a circuit, but the charge circuit relay 25a of the charge circuit 32a is configured to be in parallel with the portion of the discharge circuit 31a where the diode 23a is provided.
  • the diode 23 and the discharge circuit relay 24 of the discharge circuit 21 and the charge circuit relay 25 of the charge circuit 22 are configured to be provided in the storage battery module 20, but this is not necessarily required.
  • FIG. 6 is a schematic diagram showing the schematic configuration of the storage system 300 according to this modification.
  • the configuration of the storage battery unit 301 is different from that of the first embodiment.
  • the diodes (23a, 23b, 23c) and discharge circuit relays (24a, 24b, 24c) of the discharge circuits (41a, 41b, 41c), the charge circuit relays (25a, 25b, 25c) of the charge circuits (42a, 42b, 42c), and the ammeters (A1, A2, A3) are provided in the main body 302, not in the storage battery modules (40a, 40b, 40c).
  • each storage battery module (40a, 40b, 40c) that is detachable from the main body 302 is provided with storage batteries (1a, 1b, 1c), voltmeters (V1, V2, V3), and fuses.
  • each storage battery module 40 has a simple configuration, the versatility of the storage battery module 40 can be improved.
  • FIG. 7 is a schematic diagram showing a schematic configuration of a power storage system 400 according to such a modified example. As shown in FIG. 7, in a storage battery unit 401 according to this modified example, each power storage module (40a, 40b, 40c) has a configuration similar to that of the modified example 2.
  • the main body 402 is similar to the modified example in that diodes (23a, 23b, 23c) and discharge circuit relays (24a, 24b, 24c) of a discharge circuit (51a, 51b, 51c), charging circuit relays (25a, 25b, 25c) of a charge circuit (52a, 52b, 52c), and ammeters (A1, A2, A3) are provided.
  • this modification differs from the modification 2 in that the charging circuit relays (25a, 25b, 25c) of the respective charging circuits (52a, 52b, 52c) are connected in parallel only to the diodes (23a, 23b, 23c) of the respective discharge circuits (51a, 51b, 51c), and has the same configuration as the modification 1. That is, in this modification, a current flows through the discharge circuit relay 24a not only during discharging but also during charging.
  • Fig. 8 shows a schematic diagram of a power storage system 500 which is a modified example of such a case.
  • the storage battery unit 501 of this modified example differs from the storage battery unit 101 of embodiment 1 in that the discharge circuit relays (64a, 64b, 64c) in the discharge circuits (61a, 61b, 61c) of the storage battery units (60a, 60b, 60c) are normally open relays, and that no main body relay is provided in the main body 502.
  • both the discharge circuit relay 64 and the charge circuit relay 25 normally open relays, even if the power supply in the energy storage system 500 suddenly disappears for some reason (if an abnormal condition occurs), it is possible to cut off the circuit between the PCS 90 and each storage battery 1 even if the main body 502 does not have a normally open relay.
  • FIG. 9 shows a schematic diagram of a storage battery system 600 as a modification of such a case.
  • a storage battery unit 601 according to this modification differs from the first embodiment in that semiconductor switching elements (e.g., those including high-speed switching elements such as IGBTs) are used as the discharge circuit relays (74a, 74b, 74c) of the discharge circuits (71a, 71b, 71c).
  • semiconductor switching elements e.g., those including high-speed switching elements such as IGBTs
  • the PCS 90 operates the DC/DC converter 93 to perform a light discharge with a current of about several amperes (S201). Then, the BMS 11 obtains the current values from the ammeters A2 and A3 corresponding to the storage batteries 1b and 1c other than the storage battery 1a selected in step S103, and calculates the total value (CToff) (S202). The BMS 11 further obtains the current value (CTon) from the ammeter A1 corresponding to the selected storage battery 1a (S203).
  • the BMS 11 uses the total value calculated in step S202 and the value acquired in step S203 to determine whether or not contact welding has occurred in the discharge circuit relays 24b, 24c corresponding to the storage batteries 1b, 1c other than the selected one (S204). More specifically, in step S204, it determines whether or not the condition that CToff is less than a first threshold value and CTon exceeds a second threshold value is satisfied. If it is determined that the condition is not satisfied, it is determined that contact welding has occurred in either of the discharge circuit relays 24b, 24c, and a predetermined abnormality occurrence process is executed (S205).
  • the abnormality occurrence process may, for example, stop charging and discharging (circuit interruption) or issue an error alarm.
  • step S204 determines in step S204 that the conditions are met
  • the process proceeds to step S105, and thereafter executes the same charging control as described in embodiment 1.
  • step S108 the BMS 11 acquires the value of the voltmeter V4 (V4on) when the charging circuit relay 25a corresponding to the storage battery 1a to be charged is in a short-circuited state (step S301). After that, the BMS 11 opens the charging circuit relay 25a of the storage battery 1a that has been charged (S112), and in this state, further acquires the value of the voltmeter V4 (V4off).
  • the BMS 11 performs a process to determine whether or not the condition that V4on is equal to or greater than V4off plus a predetermined value is satisfied (S303). If the condition is not satisfied (i.e., there is no predetermined difference between the voltage during short-circuit control and during open control of the charging circuit relay 25a), it determines that the contacts of the charging circuit relay 25a are welded, and performs a predetermined abnormality occurrence process (S304). On the other hand, if the BMS 11 determines in step S303 that the condition is satisfied, it proceeds to step S113, and thereafter performs the same charging control as described in embodiment 1.
  • the discharge circuit relay corresponding to the storage battery to be charged is short-circuited during charging control, but it may be opened.
  • a configuration may be adopted in which a normally open relay is used as the discharge circuit relay of the storage battery unit of variants 2 and 3, such as the discharge circuit relay 64 in variant 4 above.
  • a configuration may be adopted in which the reactance 14 is not provided in the main body 10.
  • the criterion for selecting the storage battery to be charged was the storage battery with the lowest SOC, but the storage battery to be charged may be selected based on different criteria.
  • the selection criterion for charging may be "the storage battery with an SOC less than 100% and the highest SOC.” This makes it possible to prevent the occurrence of a rush current when discharging begins.
  • a grid-connected system that combines a storage battery unit and a PCS (and a photovoltaic power generation system) has been described as an example, but the present invention is not limited to such systems and can be widely applied to devices that use multiple storage batteries connected in parallel, such as a dedicated energy storage system that is not connected to a PV, or an uninterruptible power supply (UPS).
  • UPS uninterruptible power supply
  • a diode (23a, 23b, 23c) is provided in each of the discharge circuits (21a, 21b, 21c) to prevent reverse flow of power to the corresponding storage battery (1a, 1b, 1c).
  • the storage device (101) according to claim 1.
  • the switching elements (24a, 24b, 24c) provided in the discharge circuits (21a, 21b, 21c) are of normally closed type, and the switching elements (25a, 25b, 25c) provided in the charging circuits (22a, 22b, 22c) are of normally open type.
  • an ammeter (A1, A2, A3) for measuring a value of a charge/discharge current of the storage batteries (1a, 1b, 1c) is provided for each of the storage batteries (1a, 1b, 1c);
  • the control means (11) When starting charging the storage batteries (1a, 1b, 1c), the presence or absence of an abnormality in the normally-closed switching elements (24a, 24b, 24c) corresponding to the storage batteries other than the one being charged is determined based on the current values output by the ammeters (A1, A2, A3).
  • the storage device (101) according to claim 4.
  • a voltmeter (V4) for measuring a voltage of a main circuit to which the plurality of storage batteries (1a, 1b, 1c) are connected;
  • the control means (11) When charging of the storage batteries (1a, 1b, 1c) is completed, the presence or absence of an abnormality in the normally open switching element (25a, 25b, 25c) corresponding to the storage battery (1a, 1b, 1c) to be charged is determined based on the voltage value output by the voltmeter (V4).
  • the storage device (101) according to claim 4.
  • the switching elements (74a, 74b, 74c) provided in the discharge circuits (71a, 71b, 71c) are composed of semiconductor elements.
  • a reactance (14) is provided on a main circuit to which the plurality of storage batteries (1a, 1b, 1c) are connected.
  • the storage device (101) according to claim 9.
  • the storage battery (101) includes ammeters (A1, A2, A3) for measuring the charge/discharge currents of the storage batteries (1a, 1b, 1c), the switching elements (24a, 24b, 24c) provided in the discharge circuits (21a, 21b, 21c) are of normally closed type, and the switching elements (25a, 25b, 25c) provided in the charging circuits (22a, 22b, 22c) are of normally open type, Between the third step (S104) and the fourth step (S106), a process is performed to determine the presence or absence of an abnormality in the normally-closed switching elements (24b, 24c) corresponding to the storage batteries (1b, 1c) other than the storage battery to be charged, based on the current values output by the ammeters (A1, A2, A3). 13.
  • the storage battery (101) includes a voltmeter (V4) that measures the voltage of a main circuit to which the plurality of storage batteries (1a, 1b, 1c) are connected, the switching elements (24a, 24b, 24c) provided in the discharge circuits (21a, 21b, 21c) are of normally closed type, and the switching elements (25a, 25b, 25c) provided in the charging circuits (22a, 22b, 22c) are of normally open type, Between the fifth step (S107) and the seventh step (S115), a process is performed to determine whether or not there is an abnormality in the normally open switching element (25a) corresponding to the storage battery (1a) to be charged, based on the voltage value output by the voltmeter (V4). 13.
  • V4 voltmeter
  • Appendix 15 A program for causing a computer to execute each step of the control method according to any one of appendices 12 to 14.
  • Control circuit 94 Inverter 100, 200, 300, 400, 500, 600: Power storage system 101, 201, 301, 401, 501, 601: Storage battery unit A1, A2, A3: Ammeter V1, V2, V3, V4, . . . Voltmeter

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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)
  • Secondary Cells (AREA)
  • Protection Of Static Devices (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

L'invention concerne un dispositif de stockage d'électricité dans lequel une pluralité de batteries de stockage sont respectivement connectées de manière amovible en parallèle, le dispositif de stockage d'électricité comprenant : un moyen de commande pour commander les batteries de stockage ; et, correspondant à chaque batterie de stockage, un circuit de décharge à travers lequel circule un courant de décharge provenant de chaque batterie de stockage et un circuit de charge à travers lequel circule un courant de charge vers chaque batterie de stockage. Chaque circuit de décharge est conçu de façon à empêcher le reflux de puissance vers la batterie de stockage correspondante.
PCT/JP2024/036194 2023-10-27 2024-10-09 Dispositif de stockage d'électricité, système de stockage d'électricité, procédé de commande et programme Pending WO2025089078A1 (fr)

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JP2023-184882 2023-10-27
JP2023184882A JP2025073801A (ja) 2023-10-27 2023-10-27 蓄電装置、蓄電システム、制御方法及びプログラム

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10164709A (ja) * 1996-11-27 1998-06-19 Isuzu Motors Ltd 電源装置および電気自動車用電源装置
JP2008039842A (ja) * 2006-08-01 2008-02-21 Ricoh Co Ltd 電源電圧制御装置、電源電圧制御方法、その方法をコンピュータに実行させるプログラム、および画像形成装置
JP2009106007A (ja) * 2007-10-19 2009-05-14 Panasonic Corp 電池パック、及び電池システム
JP2009254063A (ja) * 2008-04-03 2009-10-29 Nippon Telegr & Teleph Corp <Ntt> 電源システムおよび充電方法
JP2013153545A (ja) * 2010-08-06 2013-08-08 Sanyo Electric Co Ltd 電池並列処理回路及び電池システム
JP2014060878A (ja) * 2012-09-19 2014-04-03 Kazushi Yamamoto 循環電流防止装置
WO2018186496A1 (fr) * 2017-04-07 2018-10-11 株式会社村田製作所 Dispositif de commande de charge/décharge de bloc-batterie
JP2019047681A (ja) * 2017-09-05 2019-03-22 トヨタ自動車株式会社 電源装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10164709A (ja) * 1996-11-27 1998-06-19 Isuzu Motors Ltd 電源装置および電気自動車用電源装置
JP2008039842A (ja) * 2006-08-01 2008-02-21 Ricoh Co Ltd 電源電圧制御装置、電源電圧制御方法、その方法をコンピュータに実行させるプログラム、および画像形成装置
JP2009106007A (ja) * 2007-10-19 2009-05-14 Panasonic Corp 電池パック、及び電池システム
JP2009254063A (ja) * 2008-04-03 2009-10-29 Nippon Telegr & Teleph Corp <Ntt> 電源システムおよび充電方法
JP2013153545A (ja) * 2010-08-06 2013-08-08 Sanyo Electric Co Ltd 電池並列処理回路及び電池システム
JP2014060878A (ja) * 2012-09-19 2014-04-03 Kazushi Yamamoto 循環電流防止装置
WO2018186496A1 (fr) * 2017-04-07 2018-10-11 株式会社村田製作所 Dispositif de commande de charge/décharge de bloc-batterie
JP2019047681A (ja) * 2017-09-05 2019-03-22 トヨタ自動車株式会社 電源装置

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