WO2012102128A1 - 電池パック及び電力消費機器 - Google Patents
電池パック及び電力消費機器 Download PDFInfo
- Publication number
- WO2012102128A1 WO2012102128A1 PCT/JP2012/050814 JP2012050814W WO2012102128A1 WO 2012102128 A1 WO2012102128 A1 WO 2012102128A1 JP 2012050814 W JP2012050814 W JP 2012050814W WO 2012102128 A1 WO2012102128 A1 WO 2012102128A1
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- WIPO (PCT)
- Prior art keywords
- secondary battery
- battery cell
- battery cells
- voltage
- control circuit
- Prior art date
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Classifications
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- 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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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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
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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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
- H01M10/48—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
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- 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
- H02J7/0024—Parallel/serial switching of connection of batteries to charge or load circuit
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- 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
- This disclosure relates to a battery pack and a power consuming device.
- the state of charge (SOC, State Of Charge) is different for each secondary battery cell due to temperature distribution and self-discharge bias. There is a case.
- SOC State Of Charge
- Such a state is referred to as “loss of cell balance”.
- the cell balance is lost, for example, a certain secondary battery cell is fully charged while another secondary battery cell is not fully charged. If the charging is continued in such a state, the fully charged secondary battery cell is overcharged, and there is a possibility that liquid leakage or heat generation may occur. Therefore, control is performed such that the fully charged secondary battery cell is not charged any more, but the capacity of the secondary battery cell that is not fully charged cannot be utilized to the maximum extent.
- the connection of each secondary battery cell is switched in parallel except during discharging so that the state of charge does not shift. I have to.
- the secondary battery cells are connected in series at the time of discharging, and the secondary battery cells are first connected in series at the time of charging, and then switched to the parallel connection.
- the connection in order to prevent a long charging time when connected in parallel, the connection is kept in series during CC charging and switched to parallel connection when shifting to CV charging.
- an object of the present disclosure is to have a configuration in which a plurality of secondary battery cells are connected in series at the time of discharge and connected in parallel at the time of charge, and even if there is a secondary battery cell in which an abnormality has occurred, charging is possible.
- the object is to provide a battery pack having a configuration and structure capable of discharging without hindrance, and a power consuming device including the battery pack.
- the battery pack according to the first aspect of the present disclosure for achieving the above object is A plurality of secondary battery cells and a control circuit are provided, Under the control of the control circuit, the plurality of secondary battery cells are battery packs that are connected in series when discharged, and connected in parallel when charged, Before charging, the control circuit measures the voltage of each secondary battery cell, and the measured value of the voltage is a predetermined value or less. In the disconnected state, the other secondary battery cells are charged as a parallel connection.
- the battery pack according to the second aspect of the present disclosure for achieving the above object is as follows: A plurality of secondary battery cells and a control circuit are provided, Under the control of the control circuit, the plurality of secondary battery cells are battery packs that are connected in series when discharged, and connected in parallel when charged, The control circuit measures the voltage of each secondary battery cell each time the discharge is interrupted, and stores it in a storage device provided in the control circuit, The control circuit is configured such that the secondary battery cell whose measured value of the stored voltage is not more than a predetermined value is electrically disconnected from the other secondary battery cell as an abnormal secondary battery cell. Are charged as a parallel connection.
- the battery pack according to the third aspect of the present disclosure for achieving the above-described object, A plurality of secondary battery cells and a control circuit are provided, Under the control of the control circuit, the plurality of secondary battery cells are battery packs that are connected in series when discharged, and connected in parallel when charged, The control circuit After the secondary battery cells are connected in series, after charging to a predetermined amount of power, the voltage of the secondary battery cells connected in series is measured, When the voltage measurement value of the secondary battery cells connected in series exceeds the first predetermined value, the secondary battery cells are switched to the parallel connection to charge the secondary battery cells, and the charging is completed.
- the voltage measurement value of the secondary battery cells connected in series is less than or equal to the first predetermined value
- the voltage of each secondary battery cell is measured, and the secondary battery cell whose voltage measurement value is less than or equal to the second predetermined value
- the other secondary battery cell is charged in parallel connection to complete the charging.
- a power consuming device for achieving the above object includes the battery pack according to the first to third aspects of the present disclosure.
- the secondary battery cells are connected in series at the time of discharging, while the battery pack is abnormal at the time of charging.
- the other secondary battery cell In a state where the generated secondary battery cell is electrically disconnected from the other secondary battery cell, the other secondary battery cell is connected in parallel. Therefore, the occurrence of cell balance can be prevented and the performance of the secondary battery cell can be fully exerted.
- the secondary battery cells are connected in parallel during charging, the secondary battery with an abnormality is generated. A large current can be prevented from flowing into the cell from other normal secondary battery cells all at once.
- the state of charge (SOC) in other normal secondary battery cells can be made equal, and the collapse of the state of charge due to the self-discharge of the secondary battery cell and the variation in temperature distribution in the battery pack is corrected. Therefore, a correction circuit called a cell balance circuit is unnecessary. Furthermore, since the secondary battery cells including the secondary battery cell in which an abnormality has occurred are connected in series at the time of discharge, the total voltage is reduced by an amount corresponding to the secondary battery cell in which an abnormality has occurred compared to the normal time. If heat is generated when the abnormal secondary battery cell is energized, it is detected before charging and the battery pack cannot be used, which is not a significant problem.
- FIG. 1 is a conceptual diagram for explaining the operation of the battery pack according to the first embodiment.
- FIG. 2 is a conceptual diagram for explaining the operation of the battery pack of Example 1 following FIG.
- FIG. 3 is a conceptual diagram for explaining the operation of the battery pack of Example 1 following FIG. 2.
- FIG. 4 is a conceptual diagram for explaining the operation of the battery pack of Example 1 following FIG. 3.
- FIG. 5 is a conceptual diagram for explaining the operation of the battery pack according to the second embodiment.
- FIG. 6 is a conceptual diagram for explaining the operation of the battery pack of Example 2 following FIG. 5.
- FIG. 7 is a conceptual diagram for explaining the operation of the battery pack of Example 2 following FIG. 6.
- FIG. 8 is a conceptual diagram for explaining the operation of the battery pack of Example 2 following FIG. 7.
- FIG. 9 shows a charging switch, a first parallel-series switching device, and a second parallel-series switching device when the first secondary battery cell is an abnormal secondary battery cell in the battery pack of the second embodiment.
- FIG. 10 shows a charging switch, a first parallel-series switching device, and a second parallel-series switching device when the second secondary battery cell is an abnormal secondary battery cell in the battery pack of Example 2.
- FIG. 11 shows a charging switch, a first parallel-series switching device, and a second parallel-series switching device when the third secondary battery cell is an abnormal secondary battery cell in the battery pack of the second embodiment. It is a conceptual diagram which shows the state of.
- FIG. 10 shows a charging switch, a first parallel-series switching device, and a second parallel-series switching device when the second secondary battery cell is an abnormal secondary battery cell in the battery pack of Example 2.
- FIG. 11 shows a charging switch, a first parallel-series switching device, and a second parallel-series switching device when the third secondary battery cell is an abnormal
- FIG. 12 shows a charging switch, a first parallel-series switching device, and a second parallel-series switching device when the fifth secondary battery cell is an abnormal secondary battery cell in the battery pack of Example 2.
- FIG. 13 shows a charging switch, a first parallel-series switching device, and a second parallel-series switching device when the sixth secondary battery cell is an abnormal secondary battery cell in the battery pack of Example 2.
- FIG. 14 shows a charging switch, a first parallel-series switching device, and a second parallel-series switching device when the fourth secondary battery cell is an abnormal secondary battery cell in the battery pack of Example 2. It is a conceptual diagram which shows the state of this modification.
- Example 1 battery pack and power consuming device according to the first aspect of the present disclosure
- Example 2 Modification of Example 1 4
- Example 3 battery pack and power consuming device according to the second aspect of the present disclosure
- Example 4 battery pack and power consuming device according to the third aspect of the present disclosure
- the control circuit includes a voltage measurement device for measuring the voltage of the secondary battery cell, and is not limited, but when the number of secondary battery cells is an even number, the number of voltage measurement devices is Given the quotient obtained by dividing the number of battery cells by 2, when the number of secondary battery cells is an odd number, the number of voltage measuring devices is obtained by dividing the number of secondary battery cells by 2. It is possible to use a form obtained by adding 1 to the quotient.
- a predetermined value is not limited.
- the predetermined voltage value in the battery pack or the like according to the second aspect of the above is a nominal voltage, or a voltage equal to or lower than the nominal voltage (for example, a value obtained by subtracting 0.05 to 0.2 volts from the nominal voltage). can do.
- the control circuit preferably discharges the abnormal secondary battery cells in a state of being connected in series with the other secondary battery cells, whereby all the secondary battery cells are normal. As compared with the above, the total voltage is reduced by the number of abnormal secondary battery cells. If the abnormal secondary battery cell generates heat when it is energized, it is detected before charging and the battery pack cannot be used, and this is not a big problem in actual use.
- the battery pack according to the first aspect of the present disclosure including the above-described preferred form and the power consuming device according to the present disclosure including the battery pack according to the first aspect of the present disclosure are generically named.
- the battery pack according to the second aspect of the present disclosure including the above-described preferred form, and the battery according to the second aspect of the present disclosure are referred to as “battery pack and the like according to the first aspect of the present disclosure”.
- the power consuming devices of the present disclosure including the pack are collectively referred to as “battery packs and the like according to the second aspect of the present disclosure”, and the battery pack according to the third aspect of the present disclosure including the above-described preferable mode And the power consuming devices of the present disclosure including the battery pack according to the third aspect of the present disclosure are collectively referred to as “battery packs and the like according to the third aspect of the present disclosure”, and The battery pack according to the first aspect to the battery pack according to the third aspect of the present disclosure Collectively, simply it may be referred to as "battery pack of the present disclosure". Furthermore, the battery pack and the like according to the first aspect of the present disclosure to the battery pack and the like according to the third aspect of the present disclosure may be collectively referred to simply as “the present disclosure”.
- the configuration and structure of the secondary battery cell itself can be a known configuration and structure, and the shape of the secondary battery cell can be a known cylindrical shape or a square shape including a laminate type.
- the number (N) of secondary battery cells constituting the battery pack of the present disclosure may be determined as appropriate based on the specifications of the battery pack and the specifications of the power consuming device. Specifically, the secondary battery cell in which an internal short circuit has occurred can be illustrated as an abnormal secondary battery cell in the present disclosure, and the value of current flowing from a normal secondary battery cell during charging is higher.
- the control circuit can be configured from a known circuit including an MPU and a storage device (for example, a nonvolatile memory such as an EEPROM, a RAM, and a register). Further, in the present disclosure, a charge / discharge control circuit for controlling charging and discharging of the secondary battery cell is provided, and this charge / discharge control circuit includes an MPU and a storage device (for example, a nonvolatile memory such as an EEPROM, a RAM, It can be configured from a known circuit having a register.
- the charge / discharge control circuit may be provided with a well-known battery protection circuit, and the battery protection circuit may be activated to stop the function of the battery pack as necessary.
- a charge / discharge control circuit may be incorporated in the control circuit.
- an appropriate switch device for example, a MOSFET may be disposed between the control circuit and the secondary battery cell. Further, in order to electrically separate from the other secondary battery cells as the secondary battery cell in which an abnormality has occurred, an appropriate switch device, for example, a MOSFET may be arranged, but depending on the configuration and structure of the battery pack, Such a switch device is unnecessary.
- a voltage measuring device for measuring the voltage of the secondary battery cell can also be configured from a known circuit.
- the power source of the control circuit, the charge / discharge control circuit and the voltage measuring device may be a secondary battery cell constituting the battery pack.
- the battery pack of the present disclosure when a plurality of secondary battery cells that are connected in series at the time of discharging and are connected in parallel at the time of charging are used as secondary battery cell units, the battery pack of the present disclosure includes one secondary battery cell unit. May be provided, or two or more may be provided.
- the control circuit measures the voltage of each secondary battery cell before charging.
- the open circuit voltage OCV, Open Circuit Voltage. Secondary battery
- OCV Open Circuit Voltage. Secondary battery
- the predetermined value in the battery pack or the like according to the first aspect of the present disclosure is not limited, but is determined from the discharge end voltage. A value obtained by subtracting the voltage value of (for example, 0.1 volts) can be exemplified.
- the control circuit measures the voltage of each secondary battery cell every time the discharge is interrupted. In this case, for example, the open circuit voltage is measured. Just do it.
- the measured voltage value is stored in a storage device provided in the control circuit, but the latest measured voltage value may be stored in the storage device.
- a storage device provided in the control circuit a known nonvolatile memory can be given.
- the predetermined value in the battery pack or the like according to the second aspect of the present disclosure is not limited. A value obtained by subtracting 05 volts to 0.2 volts can be exemplified.
- 0.05 to 0.2 volts is obtained from the product of the value obtained by adding a voltage measurement error (for example, 0.01 volts) to the nominal voltage and the number of series.
- the reduced value can be exemplified.
- the voltage measurement value of the secondary battery cells connected in series is equal to or less than the first predetermined value, the voltage of each secondary battery cell is measured. In this case, for example, the open circuit voltage of the secondary battery cell is measured. Just do it.
- a value obtained by subtracting 0.05 volts to 0.5 volts from the nominal voltage can be exemplified.
- the battery pack of the present disclosure includes, for example, an electric vehicle (including a hybrid vehicle), a golf cart, an electric cart, an electric motorcycle, an electric assist bicycle, a railway vehicle, an electric tool such as an electric drill, a power supply unit, or a home energy server (household).
- an electric vehicle including a hybrid vehicle
- a golf cart including a golf cart
- an electric cart including a golf cart
- an electric motorcycle including a golf cart
- an electric assist bicycle such as an electric drill, a power supply unit, or a home energy server (household).
- a home energy server household
- Power storage device personal computer, mobile phone, PDA (personal digital assistant), digital still camera and video camera, camcorder, electronic book, electronic dictionary, music player, radio, headphone, cordless telephone handset, electric shaver, refrigerator, Air conditioners, television receivers and image display devices, monitors, stereo devices, water heaters, microwave ovens, dishwashers, washing machines, dryers, indoor lighting and other lighting equipment, game machines, navigation systems, memory cards, pacemakers, Hearing aid, medical device , Toys, robots, can be applied load conditioner, a variety of power consumption devices such as traffic lights or the like, may be the driving power source or auxiliary power source for these power devices.
- the power consuming device of the present disclosure includes the battery pack according to the first to third aspects of the present disclosure including the various preferable modes and configurations described above.
- the battery pack of the present disclosure can be applied to devices such as a power storage power source for a building such as a house or a power generation facility, and for supplying power to these devices. It can also be used as a power storage device in a so-called smart grid. Note that such a power storage device can store power not only by supplying power but also by receiving power supply from another power source.
- the battery pack of the present disclosure may be incorporated into a home energy management (management) system (HEMS, Home Energy Management System) or a building energy management system (BEMS, Building Energy Management System).
- HEMS home energy management
- BEMS Building Energy Management System
- a power source for charging the secondary battery cells constituting the battery pack not only a commercial power source, but also various solar cells, fuel cells, thermal power generation facilities, nuclear power generation facilities, hydroelectric power generation facilities, wind power generation devices, micro hydropower generation A device, a geothermal power generation device, and the like can be exemplified, and the regenerative energy generated by the power consuming device can be exemplified, but is not limited thereto.
- Example 1 relates to a battery pack according to a first aspect of the present disclosure and a power consuming device including the battery pack.
- the battery packs of Example 1 or Examples 2 to 4 to be described later include a plurality (N) of secondary battery cells 21 and a control circuit 11, and a plurality of secondary battery cells under the control of the control circuit 11. 21 is connected in series at the time of discharging, and is connected in parallel at the time of charging.
- the control circuit 11 incorporates a charge / discharge control circuit.
- the value of N is not limited to 6.
- the secondary battery cell 21 is composed of a lithium ion secondary battery.
- the charge end voltage of the secondary battery cell 21 is 4.2 volts
- the discharge end voltage is 2.5 volts
- the nominal voltage is 3.7 volts.
- switch devices (separation switch devices) 31 1 to 31 6 comprising MOSFETs for separating the abnormality secondary battery cells from other secondary battery cells are arranged.
- the switch devices 31 1 to 31 6 arranged in the vicinity of one end (positive electrode) of the secondary battery cell, switch devices (second parallel-series switching switch devices) 33 1 to 33 5 made of MOSFETs, and Switch devices (first parallel series switching switch devices) 32 1 to 32 5 made of MOSFETs are arranged.
- the secondary battery cell 21 1 positioned at one end when the secondary battery cells 21 are connected in series is connected to one input / output terminal 34.
- the secondary battery cell 21 6 located at the other end when the secondary battery cells 21 connected in series is connected to the other 35 of the input and output terminals.
- the input / output terminals 34 and 35 are connected to a power consuming device (not shown) to which power is supplied by a changeover switch (not shown), or alternatively to a device (circuit) (not shown) for charging the secondary battery cell.
- the first parallel / serial changeover switch devices 32 1 to 32 5 and the second parallel / serial changeover switch devices 33 1 to 33 5 are switch devices having three terminal portions.
- first parallel-serial switching devices 32 1, 31 3, 32 5 each of the first terminal portion of the second parallel-serial switching device 33 1, 32 3, 33 5, the voltage measuring device 12 1, 12 2 and 12 3 are connected.
- the second terminal portions of the first parallel / serial changeover switch devices 32 1 to 32 5 and the second parallel / serial changeover switch devices 33 1 to 33 5 are connected to one end (positive electrode) of the secondary battery cell 21, the other end of the secondary battery cell 21 adjacent to the secondary battery cells 21 and a (negative), a switching terminal portion of the "serial mode" that connects via a trip switch device 31 1 to 31 6.
- the third terminal portions of the first parallel / serial changeover switch devices 32 1 to 32 5 and the second parallel / serial changeover switch devices 33 1 to 33 5 are connected to one end (positive electrode) of the secondary battery cell 21, respectively.
- One end (positive electrode) of the secondary battery cell 21 adjacent to the secondary battery cell 21 is connected, and the other end (negative electrode) of the secondary battery cell 21 and the secondary battery cell 21 adjacent to the secondary battery cell 21 are connected.
- the secondary battery cells 21 are connected in series and are in a discharged state. Specifically, disconnection switch device 31 1 to 31 6 are in the "closed state”. Further, the first parallel / serial changeover switch devices 32 1 to 32 5 and the second parallel / serial changeover switch devices 33 1 to 32 5 are in the “series mode”, and the plurality of secondary battery cells 21 are connected in series.
- the control circuit 11 When receiving a charging start signal from an external circuit (not shown), the control circuit 11 starts preparation for starting charging. Further, the voltage at both ends of the secondary battery cell unit 20 is measured, and preparation for starting charging is also started when the value of the measured voltage becomes a discharge end voltage or a voltage lower than that. That is, the control circuit 11 measures the voltage of each secondary battery cell 21 before charging. Specifically, as shown in a conceptual diagram in FIG. 2, for example, odd-numbered secondary battery cells 21 1 , 21 3 , and 21 5 in the secondary battery cell unit 20 are connected to the control circuit 11. That is, switches while the disconnecting switch unit 31 1 to 31 6 as "closed state", the first parallel-serial switching devices 32 1, 32 3, 32 5 to "parallel mode".
- the open voltage of the odd-numbered secondary battery cells 21 1 , 21 3 , 21 5 can be measured by the voltage measuring devices 12 1 to 12 3 provided in the control circuit 11.
- the measured open-circuit voltages of the odd-numbered secondary battery cells 21 1 , 21 3 , 21 5 are stored in a storage device provided in the control circuit 11.
- the voltage measuring device 12 1 is connected to the first parallel / serial switching device 32 1
- the voltage measuring device 12 2 is connected to the first parallel / serial switching device 32 3
- the voltage measuring device 12 3 is connected to the first parallel / serial switching device 32 1. It is connected in serial switching device 32 5.
- the first parallel-series changeover switch devices 32 1 , 32 3 , and 32 5 are set to the “series mode” while the separation switch devices 31 1 to 31 6 are in the “closed state”.
- the second parallel series changeover switch devices 33 1 , 33 3 , and 33 5 are switched to the “parallel mode”.
- the open voltage of the even-numbered secondary battery cells 21 2 , 21 4 , 21 6 can be measured by the voltage measuring devices 12 1 to 12 3 provided in the control circuit 11.
- the measured open circuit voltages of the odd-numbered secondary battery cells 21 2 , 21 4 , 21 6 are stored in a storage device provided in the control circuit 11.
- the control circuit 11 includes a voltage measurement device for measuring the voltage of the secondary battery cell 21.
- the number (N) of the secondary battery cells 21 is an even number ( In the above example, 6)
- the number of voltage measuring devices is given by the quotient obtained by dividing the number of secondary battery cells by 2 (3 in the above example).
- the number (N) of secondary battery cells is an odd number
- the number of voltage measuring devices is given by a value obtained by adding 1 to the quotient obtained by dividing the number of secondary battery cells by 2.
- the control circuit 11 determines that the voltage measurement value is a predetermined value (a predetermined voltage value in the battery pack or the like according to the first aspect of the present disclosure. A value obtained by subtracting 0.1 volts from the voltage, more specifically, a secondary battery cell having a discharge end voltage of 2.5 volts and subtracting 0.1 volts (2.4 volts) or less. It is determined as a cell.
- control circuit 11 has a discharge curve table in advance, and a circuit for measuring the flowing current is provided. It is provided, and the expected voltage can be derived by accumulating the flowing current values and comparing them with the table.
- the fourth secondary battery cell 21 4 is an abnormal secondary battery cell.
- the trip switch device 31 1 to 31 3, 315 to 31 6 while a "closed", the trip switch 31 4 is "opened state", together, the first parallel
- the series changeover switch devices 32 1 to 32 5 and the second parallel series changeover switch devices 33 1 to 33 5 to the “parallel mode” the abnormal secondary battery cell 21 4 is electrically connected to another secondary battery cell. And disconnect. Then, the secondary battery cells 21 1 to 21 3 and 21 5 to 21 6 are charged based on a known method.
- the charging / discharging method of the battery pack using the battery pack 10 of Example 1 is as follows.
- a plurality of secondary battery cells and a control circuit are provided, Under the control of the control circuit, the plurality of secondary battery cells are connected in series at the time of discharging, and a charging / discharging method of the battery pack that is connected in parallel at the time of charging, Under the control of the control circuit, before charging, the voltage of each secondary battery cell is measured, and the secondary battery cell whose measured voltage value is not more than a predetermined value is electrically used as the secondary battery cell in which an abnormality has occurred. In the state of being disconnected, the other secondary battery cells are charged as a parallel connection.
- battery packs are used for electric power such as, for example, electric cars (including hybrid cars), golf carts, electric carts, electric motorcycles, electric assist bicycles, and railway vehicles. It can be applied to consumer equipment. That is, the power consuming device includes a battery pack having a plurality of secondary battery cells 21. The battery pack is discharged for driving a conversion device (specifically, for example, a motor) that converts electric power into driving force by supplying electric power. The battery pack can be charged using regenerative energy.
- these power consuming devices include, for example, a control device including a battery remaining amount display and a control device that performs information processing related to the control of the power consuming device based on information related to the secondary battery cell 21.
- the control circuit measures the voltage of each secondary battery cell before charging, At the time of charging, the other secondary battery cells are connected in parallel with the abnormal secondary battery cells being electrically disconnected from the other secondary battery cells. Therefore, when the secondary battery cells are connected in parallel at the time of charging, it is possible to prevent large currents from flowing from other normal secondary battery cells to the abnormal secondary battery cells all at once. Further, since the secondary battery cells including the secondary battery cell in which an abnormality has occurred are connected in series at the time of discharge, the total voltage is reduced by an amount corresponding to the secondary battery cell in which the abnormality has occurred compared to the normal time. If heat is generated when the abnormal secondary battery cell is energized, it is detected before charging and the battery pack cannot be used, which is not a significant problem.
- Example 1 the voltages of the N secondary battery cells 21 were measured by N / 2 voltage measuring devices, but the first parallel-series switching devices 32 1 to 32 5 , By measuring the voltage of N secondary battery cells 21 by a number of voltage measuring devices less than N / 2, for example, at least one voltage measuring device, by appropriate switching of the parallel-series changeover switch devices 33 1 to 33 5. Can do.
- the second embodiment is a modification of the first embodiment.
- the disconnect switch devices 31 1 to 31 6 are omitted.
- the other end (negative electrode) of the second secondary battery cell 21 2 and the other end (negative electrode) of the Nth secondary battery cell 21 N are connected via a charging wire 42.
- the charging wire 42 is provided with second charging switches 43 1 and 43 2 , and the charging wire 42 is used for charging the secondary battery cell via the other 45 of the input terminal portion. It is connected to a device (circuit) (not shown).
- the output terminals 34 and 35 are connected to a power consuming device (not shown) to which power is to be supplied.
- the secondary battery cells 21 are connected in series and are in a discharged state. Specifically, the charging switches 41 1 , 41 2 , 43 1 , 43 2 are in the “open state”. Further, the first parallel / serial changeover switch devices 32 1 to 32 5 and the second parallel / serial changeover switch devices 33 1 to 32 5 are in the “series mode”, and the plurality of secondary battery cells 21 are connected in series.
- control circuit 11 when the control circuit 11 receives a charge start signal from an external circuit (not shown), the control circuit 11 starts preparation for starting the charge. Further, the voltage at both ends of the secondary battery cell unit 20 is measured, and preparation for starting charging is also started when the value of the measured voltage becomes a discharge end voltage or a voltage lower than that. That is, the control circuit 11 measures the voltage of each secondary battery cell 21 before charging. Specifically, as shown in a conceptual diagram in FIG. 6, for example, odd-numbered secondary battery cells 21 1 , 21 3 , and 21 5 in the secondary battery cell unit 20 are connected to the control circuit 11.
- the charging switches 41 1 , 41 2 , 43 1 , and 43 2 are in the “open state”
- the first parallel / serial switching devices 32 1 , 32 3 , and 32 5 are switched to the “parallel mode”.
- the open voltage of the odd-numbered secondary battery cells 21 1 , 21 3 , 21 5 can be measured by the voltage measuring devices 12 1 to 12 3 provided in the control circuit 11.
- the measured odd-numbered secondary battery cells 21 1 , 21 3 , 21 5 are stored in a storage device provided in the control circuit 11.
- the voltage measuring device 12 1 is connected to the first parallel / serial switching device 32 1
- the voltage measuring device 12 2 is connected to the first parallel / serial switching device 32 3
- the voltage measuring device 12 3 is connected to the first parallel / serial switching device 32 1. It is connected in serial switching device 32 5.
- the open voltage of the even-numbered secondary battery cells 21 2 , 21 4 , 21 6 can be measured by the voltage measuring devices 12 1 to 12 3 provided in the control circuit 11.
- the measured even-numbered secondary battery cells 21 2 , 21 4 and 21 6 are stored in a storage device provided in the control circuit 11.
- the control circuit 11 has a voltage measurement value of a predetermined value (a predetermined voltage value in the battery pack or the like according to the first aspect of the present disclosure, a value obtained by subtracting 0.1 volts from the discharge end voltage, More specifically, a secondary battery cell of 2.4 volts or less obtained by subtracting 0.1 volts from an end-of-discharge voltage of 2.5 volts is determined as an abnormal secondary battery cell. And this abnormal secondary battery cell is electrically disconnected from other secondary battery cells, and these other secondary battery cells are charged as a parallel connection.
- a predetermined value a predetermined voltage value in the battery pack or the like according to the first aspect of the present disclosure, a value obtained by subtracting 0.1 volts from the discharge end voltage, More specifically, a secondary battery cell of 2.4 volts or less obtained by subtracting 0.1 volts from an end-of-discharge voltage of 2.5 volts is determined as an abnormal secondary battery cell.
- this abnormal secondary battery cell is electrically disconnected from other secondary battery cells, and these other secondary
- the fourth secondary battery cell 21 4 is an abnormal secondary battery cell.
- the charging switches 41 1 , 41 2 , 43 1 , 43 2 are switched to the “closed state”.
- the first parallel / serial changeover switch devices 32 3 and 32 4 remain in “series mode”
- the first parallel / serial changeover switch devices 32 1 , 32 2 , and 32 5 change to “parallel mode”
- the second parallel The series changeover switch devices 33 1 to 33 5 are switched to the “parallel mode”.
- abnormal-state secondary battery cell 21 4 may be a disconnect the electrical other secondary battery cells.
- the secondary battery cells 21 1 to 21 3 and 21 5 to 21 6 are charged based on a known method.
- FIG. 9 shows the state of the second parallel / serial changeover switch devices 33 1 to 33 5 .
- FIG. 10 shows the state of the second parallel / serial changeover switch devices 33 1 to 33 5 .
- charging switches 41 1 , 41 2 , 43 1 , 43 2 , first parallel / series switching devices 32 1 to 32 are provided.
- charging switches 41 1 , 41 2 , 43 1 , 43 2 , first parallel / series switching devices 32 1 to 32 5 are provided.
- FIG. 12 shows the state of the second parallel / serial changeover switch devices 33 1 to 33 5 .
- charging switches 41 1 , 41 2 , 43 1 , 43 2 , and first parallel / series switching devices 32 1 to 32 are provided. 5, the state of the second parallel-serial switching device 33 1-33 5, shown in Figure 13.
- Example 3 relates to a battery pack according to the second aspect of the present disclosure and a power consuming device including the battery pack.
- the control circuit 11 measures the voltage of each secondary battery cell 21 each time the discharge is interrupted, and stores the voltage in the storage device provided in the control circuit 11. The latest measured voltage value is stored in the storage device.
- the measurement of the voltage of each secondary battery cell 21 may be performed based on substantially the same operation as [Operation-100] described in the first embodiment.
- the control circuit 11 is in a state where the secondary battery cell whose measured value of the stored voltage is not more than a predetermined value is electrically disconnected from other secondary battery cells as an abnormal secondary battery cell.
- the secondary battery cells are charged as a parallel connection. That is, the control circuit 11 reads the voltage measurement value stored in the storage device, and the voltage measurement value is a predetermined value (a predetermined voltage value in the battery pack or the like according to the second aspect of the present disclosure, specifically, A secondary battery cell having a nominal voltage of 3.7 volts, which is a value obtained by subtracting 0.2 volts from 3.5 volts, is determined as an abnormal secondary battery cell.
- the abnormal secondary battery cell is electrically connected to another secondary battery cell. Disconnect from the battery cell. And these other secondary battery cells are charged as parallel connection.
- the predetermined voltage value in the battery pack or the like may be employed as the predetermined voltage value from the discharge end voltage (specifically, from the discharge end voltage of 2.5 volts to, for example, 0.1 volts). 2.4 volts) may be employed.
- the control circuit 11 keeps the secondary battery cell in which the abnormality has occurred in series with other secondary battery cells. Discharge.
- the charging / discharging method of the battery pack using the battery pack of Example 3 is as follows: A plurality of secondary battery cells and a control circuit are provided, Under the control of the control circuit, the plurality of secondary battery cells are connected in series at the time of discharging, and a charging / discharging method of the battery pack that is connected in parallel at the time of charging, Under the control of the control circuit, each time the discharge is interrupted, the voltage of each secondary battery cell is measured and stored in a storage device provided in the control circuit, and the stored voltage measurement value is a predetermined value or less. In a state where the battery cell is electrically disconnected from the other secondary battery cell as an abnormal secondary battery cell, the other secondary battery cell is charged in parallel connection.
- the control circuit sets the voltage of each secondary battery cell every time the discharge is interrupted. Measured, stored in a storage device provided in the control circuit, and during charging, a secondary battery cell whose measured value of the stored voltage is not more than a predetermined value is electrically used as an abnormal secondary battery cell, and another secondary battery Other secondary battery cells are connected in parallel in a state separated from the cells. Therefore, when the secondary battery cells are connected in parallel at the time of charging, it is possible to prevent large currents from flowing from other normal secondary battery cells to the abnormal secondary battery cells all at once.
- the secondary battery cells including the secondary battery cell in which an abnormality has occurred are connected in series at the time of discharge, the total voltage is reduced by an amount corresponding to the secondary battery cell in which the abnormality has occurred compared to the normal time. If heat is generated when the abnormal secondary battery cell is energized, it is detected before charging and the battery pack cannot be used, which is not a significant problem.
- Example 4 relates to a battery pack according to a third aspect of the present disclosure and a power consuming device including the battery pack.
- the battery pack in which an abnormality has occurred maintains a certain open circuit voltage, it may be difficult to detect an abnormality in the secondary battery cell in the first to third embodiments. That is, when the remaining capacity of each secondary battery cell is decreased, the open circuit voltage is decreased, and therefore, it may be impossible to distinguish between the secondary battery cell in which an abnormality has occurred and the normal secondary battery cell.
- the battery pack having the configuration and structure of Example 4 may be employed.
- the control circuit 11 charges the secondary battery cells 21 to a predetermined amount of power by connecting the secondary battery cells 21 in series. That is, the battery is charged to a capacity that is expected to reach a certain voltage (voltage exceeding the first predetermined value).
- the first The amount of electric power that can be expected to exceed a predetermined value is charged.
- the voltage of the secondary battery cells 21 connected in series (specifically, for example, an open circuit voltage) is measured, and the control circuit 11 determines that the voltage measurement value of the secondary battery cells 21 connected in series has the first predetermined value.
- the predetermined amount of power was 1.8 watts / hour, and the first predetermined value was 3.5 volts.
- control circuit 11 sets the disconnection switch devices 31 1 to 31 6 to the “closed state”, and the first parallel / serial switching device 32 1 to 32 5 and the second parallel / serial switching device 33 1 to 33 5.
- the voltage at both ends of the secondary battery cell unit 20 that is the voltage at both ends of the secondary battery cell unit 20 that is the measured value of the voltage of the secondary battery cells 21 in series connection (open voltage) Measure.
- the control circuit 11 determines that no abnormality occurs in the secondary battery cells 21, the trip switch device 31 1 to 31 6 as "closed”
- the first parallel / serial changeover switch devices 32 1 to 32 5 and the second parallel / serial changeover switch devices 33 1 to 33 5 are switched from the “series mode” to the “parallel mode”.
- the secondary battery cells 21 1 to 21 6 are charged based on a known method.
- the control circuit 11 determines that an abnormality has occurred in any of the secondary battery cells, and each secondary battery cell 21 In the state where the secondary battery cell 21 whose voltage measurement value is equal to or less than the second predetermined value is electrically separated from the other secondary battery cells 21 as an abnormal secondary battery cell.
- the other secondary battery cells 21 are charged in parallel connection to complete the charging.
- the abnormal secondary battery cell is electrically connected to the other. Separate from the secondary battery cell. And these other secondary battery cells are charged as parallel connection.
- the second predetermined value was 3.3 volts.
- the control circuit 11 keeps the secondary battery cell in which the abnormality has occurred in series with other secondary battery cells. Discharge.
- the charging / discharging method of the battery pack using the battery pack of Example 4 is as follows: A plurality of secondary battery cells and a control circuit are provided, Under the control of the control circuit, the plurality of secondary battery cells are connected in series at the time of discharging, and a charging / discharging method of the battery pack that is connected in parallel at the time of charging, Under the control of the control circuit, the secondary battery cells are connected in series, and after charging to a predetermined amount of power, the voltage of the secondary battery cells connected in series is measured, When the voltage measurement value of the secondary battery cells connected in series exceeds the first predetermined value, the secondary battery cells are switched to the parallel connection to charge the secondary battery cells, and the charging is completed.
- the voltage measurement value of the secondary battery cells connected in series is less than or equal to the first predetermined value
- the voltage of each secondary battery cell is measured, and the secondary battery cell whose voltage measurement value is less than or equal to the second predetermined value
- the other secondary battery cell is charged in parallel connection to complete the charging.
- the control circuit In the battery pack of Example 4 or the power consuming device including such a battery pack, while being discharged, the control circuit is connected in series, while the control circuit electrically connects the abnormal secondary battery cell to the other during charging.
- Other secondary battery cells are connected in parallel in a state separated from the secondary battery cells. Therefore, when the secondary battery cells are connected in parallel at the time of charging, it is possible to prevent large currents from flowing from other normal secondary battery cells to the abnormal secondary battery cells all at once. Further, since the secondary battery cells including the secondary battery cell in which an abnormality has occurred are connected in series at the time of discharge, the total voltage is reduced by an amount corresponding to the secondary battery cell in which the abnormality has occurred compared to the normal time.
- the battery pack configuration, structure, and battery pack charge / discharge method described in the fourth embodiment may be combined with the battery pack configuration, structure, and battery pack charge / discharge method described in the first to third embodiments. it can.
- the control by the control circuit 11 of the disconnection switch devices 31 1 to 31 6 , the first parallel / serial changeover switch devices 32 1 to 32 5 , and the second parallel / serial changeover switch devices 33 1 to 33 5 may be performed based on wires. It may be performed based on radio.
- the secondary battery cell and the voltage measuring device are connected by wiring.
- an IC chip including a wireless device and a voltage measuring device is arranged in the secondary battery cell, and the secondary battery cell is wirelessly connected. The voltage measurement result in the battery cell may be sent to the control circuit 11.
- an abnormality detection circuit for example, an abnormality detection circuit constituted by a resistor and an analog / digital converter (ADC) that detects an abnormality of the secondary battery cell may be provided in the control circuit 11.
- An abnormality detection circuit is connected to the secondary battery cell 21. When an abnormality occurs in the current flowing through the abnormality detection circuit, it can be known that an abnormality has occurred in the secondary battery cell.
- an abnormal secondary battery cell in which an internal short circuit has occurred generates a lot of heat. Therefore, it is possible to detect the presence or absence of abnormality of the secondary battery cell based on the measurement result of the temperature of the secondary battery cell.
- an IC chip including temperature detection means for example, a temperature detection means that has a pn junction and measures temperature based on the temperature dependence of the electrical resistance value of the pn junction
- a method may be employed in which temperature information measured by an IC chip is sent to the control circuit 11 by wire or wireless, for example, by being attached to the outer surface of the battery cell or disposed inside the secondary battery cell.
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Abstract
Description
複数の二次電池セル、及び、制御回路を備え、
制御回路の制御下、複数の二次電池セルは、放電時、直列接続とされ、充電時、並列接続とされる電池パックであって、
制御回路は、充電前、各二次電池セルの電圧を測定し、電圧の測定値が所定値を以下の二次電池セルを異常発生二次電池セルとして電気的に他の二次電池セルと切り離した状態で、該他の二次電池セルを並列接続として充電する。
複数の二次電池セル、及び、制御回路を備え、
制御回路の制御下、複数の二次電池セルは、放電時、直列接続とされ、充電時、並列接続とされる電池パックであって、
制御回路は、放電が中断される毎に各二次電池セルの電圧を測定し、制御回路に備えられた記憶装置に記憶し、
制御回路は、記憶された電圧の測定値が所定値以下の二次電池セルを異常発生二次電池セルとして電気的に他の二次電池セルと切り離した状態で、該他の二次電池セルを並列接続として充電する。
複数の二次電池セル、及び、制御回路を備え、
制御回路の制御下、複数の二次電池セルは、放電時、直列接続とされ、充電時、並列接続とされる電池パックであって、
制御回路は、
二次電池セルを直列接続として、所定の電力量まで充電した後、直列接続の二次電池セルの電圧を測定し、
直列接続の二次電池セルの電圧測定値が第1所定値を越える場合、二次電池セルを並列接続に切り替えて二次電池セルの充電を行い、充電を完了させ、
直列接続の二次電池セルの電圧測定値が第1所定値以下の場合、各二次電池セルの電圧を測定し、電圧測定値が第2所定値以下の二次電池セルを異常発生二次電池セルとして電気的に他の二次電池セルと切り離した状態で、該他の二次電池セルを並列接続として充電を行い、充電を完了させる。
1.本開示の第1の態様~第3の態様に係る電池パック及び電力消費機器、全般に関する説明
2.実施例1(本開示の第1の態様に係る電池パック及び電力消費機器)
3.実施例2(実施例1の変形)
4.実施例3(本開示の第2の態様に係る電池パック及び電力消費機器)
5.実施例4(本開示の第3の態様に係る電池パック及び電力消費機器)、その他
本開示の第1の態様~第3の態様に係る電池パック、あるいは、本開示の第1の態様~第3の態様に係る電池パックを備えた本開示の電力消費機器において、
制御回路は、二次電池セルの電圧を測定するための電圧測定装置を備えており、限定するものではないが、二次電池セルの数が偶数の場合、電圧測定装置の数は、二次電池セルの数を2で除して得られた商で与えられ、二次電池セルの数が奇数の場合、電圧測定装置の数は、二次電池セルの数を2で除して得られた商に1を加えた値で与えられる形態とすることができる。
制御回路11は、外部の回路(図示せず)から充電開始の信号を受け取ったとき、充電を開始するための準備を開始する。また、二次電池セルユニット20の両端の電圧を測定し、測定された電圧の値が放電終止電圧あるいはそれ以下の電圧となった場合にも、充電を開始するための準備を開始する。即ち、制御回路11は、充電前、各二次電池セル21の電圧を測定する。具体的には、図2に概念図を示すように、例えば、二次電池セルユニット20における奇数番目の二次電池セル211,213,215を制御回路11に接続する。即ち、切離しスイッチ装置311~316を「閉状態」としたまま、第1並直列切換えスイッチ装置321,323,325を「並列モード」に切り替える。これによって、奇数番目の二次電池セル211,213,215の開放電圧を、制御回路11に備えられた電圧測定装置121~123によって測定することができる。測定された奇数番目の二次電池セル211,213,215の開放電圧は、制御回路11に備えられた記憶装置に記憶される。ここで、電圧測定装置121は第1並直列切換えスイッチ装置321に接続され、電圧測定装置122は第1並直列切換えスイッチ装置323に接続され、電圧測定装置123は第1並直列切換えスイッチ装置325に接続されている。
の数は、二次電池セルの数を2で除して得られた商に1を加えた値で与えられる。
そして、図4に概念図を示すように、電圧の測定値が所定値以下の二次電池セルを異常発生二次電池セルとして電気的に他の二次電池セルと切り離した状態で、これらの他の二次電池セルを並列接続として、入出力端子34,35を介して充電する。具体的には、制御回路11は、電圧測定値が所定値(本開示の第1の態様に係る電池パック等における所定の電圧値であり、例えば完全放電状態からの充電であるなら、放電終止電圧から0.1ボルトを減じた値、より具体的には、放電終止電圧2.5ボルトから0.1ボルトを減じた2.4ボルト)以下の二次電池セルを、異常発生二次電池セルと判定する。そして、この異常発生二次電池セルを電気的に他の二次電池セルと切り離し、これらの他の二次電池セルを並列接続として充電する。尚、完全放電状態ではない状態からの充電である場合、期待される電圧を算出する必要があるが、制御回路11は予め放電カーブのテーブルを有しており、流れた電流を測定する回路を備えており、流れた電流値を積算してテーブルと照らし合わせることで期待される電圧を導くことができる。
次いで、図1に概念図を示したと同様に、二次電池セル21の充電完了後、制御回路11は、切離しスイッチ装置314を「閉状態」に戻し、第1並直列切換えスイッチ装置321~325、第2並直列切換えスイッチ装置331~335を「直列モード」に切り替える。こうして、異常発生二次電池セル214を他の二次電池セル211~213,215~216と直列接続した状態で、入出力端子34,35を介して放電させる。
複数の二次電池セル、及び、制御回路を備え、
制御回路の制御下、複数の二次電池セルは、放電時、直列接続とされ、充電時、並列接続とされる電池パックの充放電方法であって、
制御回路の制御下、充電前、各二次電池セルの電圧を測定し、電圧の測定値が所定値以下の二次電池セルを異常発生二次電池セルとして電気的に他の二次電池セルと切り離した状態で、該他の二次電池セルを並列接続として充電する。
実施例2にあっては、実施例1と同様に、制御回路11は、外部の回路(図示せず)から充電開始の信号を受け取ったとき、充電を開始するための準備を開始する。また、二次電池セルユニット20の両端の電圧を測定し、測定された電圧の値が放電終止電圧あるいはそれ以下の電圧となった場合にも、充電を開始するための準備を開始する。即ち、制御回路11は、充電前、各二次電池セル21の電圧を測定する。具体的には、図6に概念図を示すように、例えば、二次電池セルユニット20における奇数番目の二次電池セル211,213,215を制御回路11に接続する。即ち、充電用スイッチ411,412,431,432を「開状態」としたまま、第1並直列切換えスイッチ装置321,323,325を「並列モード」に切り替える。これによって、奇数番目の二次電池セル211,213,215の開放電圧を、制御回路11に備えられた電圧測定装置121~123によって測定することができる。測定された奇数番目の二次電池セル211,213,215は、制御回路11に備えられた記憶装置に記憶される。ここで、電圧測定装置121は第1並直列切換えスイッチ装置321に接続され、電圧測定装置122は第1並直列切換えスイッチ装置323に接続され、電圧測定装置123は第1並直列切換えスイッチ装置325に接続されている。
そして、図8に概念図を示すように、電圧の測定値が所定値以下の二次電池セルを異常発生二次電池セルとして電気的に他の二次電池セルと切り離した状態で、これらの他の二次電池セルを並列接続として、入力端子44,45を介して充電する。具体的には、制御回路11は、電圧測定値が所定値(本開示の第1の態様に係る電池パック等における所定の電圧値であり、放電終止電圧から0.1ボルトを減じた値、より具体的には、放電終止電圧2.5ボルトから0.1ボルトを減じた2.4ボルト)以下の二次電池セルを、異常発生二次電池セルと判定する。そして、この異常発生二次電池セルを電気的に他の二次電池セルと切り離し、これらの他の二次電池セルを並列接続として充電する。
次いで、図5に概念図を示したと同様に、二次電池セル21の充電完了後、第1並直列切換えスイッチ装置321~325、第2並直列切換えスイッチ装置331~335を「直列モード」に切り替え、充電用スイッチ411,412,431,432を「開状態」に切り替える。こうして、異常発生二次電池セル214を他の二次電池セル211~213,215~216と直列接続した状態で、出力端子34,35を介して放電させる。
[1]第1番目の二次電池セル211が異常発生二次電池セルである場合
第1並直列切換えスイッチ装置321~32(N-1) :「並列モード」
第2並直列切換えスイッチ装置331 :「直列モード」
第2並直列切換えスイッチ装置332~33(N-1) :「並列モード」
[2]第n番目(但し、2≦n≦(N-2))の二次電池セル21nが異常発生二次電池セルである場合
第1並直列切換えスイッチ装置32(n-1)~32n :「直列モード」
その他の第1並直列切換えスイッチ装置32 :「並列モード」
第2並直列切換えスイッチ装置331~33(N-1) :「並列モード」
[3]第(N-1)番目の二次電池セル21(N-1)が異常発生二次電池セルである場合
第1並直列切換えスイッチ装置321~32(N-1) :「並列モード」
第2並直列切換えスイッチ装置331~33(N-3) :「並列モード」
第2並直列切換えスイッチ装置33(N-2)~33(N-1):「直列モード」
[4]第N番目の二次電池セル21Nが異常発生二次電池セルである場合
第1並直列切換えスイッチ装置321~32(N-2) :「並列モード」
第1並直列切換えスイッチ装置32(N-1) :「直列モード」
第2並直列切換えスイッチ装置331~33(N-1) :「並列モード」
[5]第n’番目(但し、3≦n’≦(N-2))の二次電池セル21n'が異常発生二次電池セルである場合
第1並直列切換えスイッチ装置321~32(N-1) :「並列モード」
第2並直列切換えスイッチ装置33(n'-1)~33n' :「直列モード」
その他の第2並直列切換えスイッチ装置33 :「並列モード」
とすることもできる。第4番目の二次電池セル211が異常発生二次電池セルである場合の充電用スイッチ411,412,431,432、第1並直列切換えスイッチ装置321~325、第2並直列切換えスイッチ装置331~335の状態を、図14に示す。
複数の二次電池セル、及び、制御回路を備え、
制御回路の制御下、複数の二次電池セルは、放電時、直列接続とされ、充電時、並列接続とされる電池パックの充放電方法であって、
制御回路の制御下、放電が中断される毎に各二次電池セルの電圧を測定し、制御回路に備えられた記憶装置に記憶し、記憶された電圧の測定値が所定値以下の二次電池セルを異常発生二次電池セルとして電気的に他の二次電池セルと切り離した状態で、該他の二次電池セルを並列接続として充電する。
複数の二次電池セル、及び、制御回路を備え、
制御回路の制御下、複数の二次電池セルは、放電時、直列接続とされ、充電時、並列接続とされる電池パックの充放電方法であって、
制御回路の制御下、二次電池セルを直列接続として、所定の電力量まで充電した後、直列接続の二次電池セルの電圧を測定し、
直列接続の二次電池セルの電圧測定値が第1所定値を越える場合、二次電池セルを並列接続に切り替えて二次電池セルの充電を行い、充電を完了させ、
直列接続の二次電池セルの電圧測定値が第1所定値以下の場合、各二次電池セルの電圧を測定し、電圧測定値が第2所定値以下の二次電池セルを異常発生二次電池セルとして電気的に他の二次電池セルと切り離した状態で、該他の二次電池セルを並列接続として充電を行い、充電を完了させる。
Claims (9)
- 複数の二次電池セル、及び、制御回路を備え、
制御回路の制御下、複数の二次電池セルは、放電時、直列接続とされ、充電時、並列接続とされ、
制御回路は、充電前、各二次電池セルの電圧を測定し、電圧の測定値が所定値以下の二次電池セルを異常発生二次電池セルとして電気的に他の二次電池セルと切り離した状態で、該他の二次電池セルを並列接続として充電する電池パック。 - 制御回路は、二次電池セルの電圧を測定するための電圧測定装置を備えており、
二次電池セルの数が偶数の場合、電圧測定装置の数は、二次電池セルの数を2で除して得られた商で与えられ、
二次電池セルの数が奇数の場合、電圧測定装置の数は、二次電池セルの数を2で除して得られた商に1を加えた値で与えられる請求項1に記載の電池パック。 - 制御回路は、異常発生二次電池セルを前記他の二次電池セルと直列接続した状態で放電させる請求項1又は請求項2に記載の電池パック。
- 複数の二次電池セル、及び、制御回路を備え、
制御回路の制御下、複数の二次電池セルは、放電時、直列接続とされ、充電時、並列接続とされ、
制御回路は、放電が中断される毎に各二次電池セルの電圧を測定し、制御回路に備えられた記憶装置に記憶し、
制御回路は、記憶された電圧の測定値が所定値以下の二次電池セルを異常発生二次電池セルとして電気的に他の二次電池セルと切り離した状態で、該他の二次電池セルを並列接続として充電する電池パック。 - 所定値は、公称電圧以下の電圧である請求項4に記載の電池パック。
- 制御回路は、異常発生二次電池セルを前記他の二次電池セルと直列接続した状態で放電させる請求項4又は請求項5に記載の電池パック。
- 複数の二次電池セル、及び、制御回路を備え、
制御回路の制御下、複数の二次電池セルは、放電時、直列接続とされ、充電時、並列接続とされる電池パックであって、
制御回路は、
二次電池セルを直列接続として、所定の電力量まで充電した後、直列接続の二次電池セルの電圧を測定し、
直列接続の二次電池セルの電圧測定値が第1所定値を越える場合、二次電池セルを並列接続に切り替えて二次電池セルの充電を行い、充電を完了させ、
直列接続の二次電池セルの電圧測定値が第1所定値以下の場合、各二次電池セルの電圧を測定し、電圧測定値が第2所定値以下の二次電池セルを異常発生二次電池セルとして電気的に他の二次電池セルと切り離した状態で、該他の二次電池セルを並列接続として充電を行い、充電を完了させる電池パック。 - 制御回路は、異常発生二次電池セルを前記他の二次電池セルと直列接続した状態で放電させる請求項7に記載の電池パック。
- 請求項1乃至請求項8のいずれか1項に記載の電池パックを備えている電力消費機器。
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CN201280005947.0A CN103329338B (zh) | 2011-01-26 | 2012-01-17 | 电池组和电力消耗设备 |
EP12739947.5A EP2669988A1 (en) | 2011-01-26 | 2012-01-17 | Battery pack and power consuming device |
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EP (1) | EP2669988A1 (ja) |
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TW201236244A (en) | 2012-09-01 |
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