Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
  • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
  • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
  • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
  • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
  • B60L58/14—Preventing excessive discharging
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
  • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
  • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
  • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
  • B60L58/15—Preventing overcharging
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
  • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
  • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
  • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
  • B60L58/22—Balancing the charge of battery modules
• • 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
  • H01M10/04—Construction or manufacture in general
  • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
  • H01M10/44—Methods for charging or discharging
  • H01M10/443—Methods for charging or discharging in response to temperature
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
  • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
  • H02J7/50—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries acting upon multiple batteries simultaneously or sequentially
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
  • B60L2210/00—Converter types
  • B60L2210/10—DC to DC converters
• • 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
• • 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
  • Y02T10/72—Electric energy management in electromobility
• • 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
  • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
  • Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

Definitions

• the present invention relates to a power storage device including a battery module including a plurality of single cells (single cells), and in particular, includes a DC-DC converter for converting an output voltage of the battery module into a desired voltage.
• the present invention relates to a power storage device.
• a power storage device mounted on a vehicle that obtains driving force from a motor such as an electric vehicle or a hybrid vehicle a power storage device having a large capacity and voltage is required to drive a high-output motor.
• a power storage device that realizes large capacity and high voltage a power supply device that includes a battery module in which a plurality of single cells are connected in series is described in Japanese Patent Application Laid-Open No. 7-131902 (hereinafter referred to as Patent Document 1). .
• Patent Document 1 Japanese Patent Application Laid-Open No. 7-131902
• a single cell uses a lithium ion secondary battery having a high energy density.
• the power storage device has a structure that can convert the output voltage to a desired voltage in order to be applied to various types of vehicles.
• the power storage device described in Patent Document 1 in order to change the output voltage, it is necessary to change the number of single cells connected in series, so that a desired voltage can be easily obtained. Absent. As described above, when the power storage device described in Patent Document 1 is applied to various types of vehicles having different motor driving voltages, it lacks flexibility from the viewpoint.
• FIG. 1 shows the schematic configuration of this power storage device.
• the power storage device includes a battery module 100 composed of a plurality of single cells connected in parallel, and a booster circuit 200 for boosting the output voltage of the battery module 100 to a desired voltage. Since the booster circuit 200 can boost the output voltage of the battery module 100 to a desired output voltage, it can be applied to various types of vehicles.
• a power storage device including a battery module in which a plurality of single cells are connected in series as described in Patent Document 1
• a battery module using a lithium ion secondary battery for a single cell charging and discharging are performed. If the operation is repeated continuously, the capacity between the cells changes, and as a result, some cells are overcharged or overdischarged.
• a cell balance circuit is usually provided for adjusting the capacity balance between cells connected in series.
• Known cell balance circuits include those described in JP-A-2001-178008 (hereinafter referred to as Patent Document 3) or JP-A-7-50172 (hereinafter referred to as Patent Document 4). .
• FIG. 2 shows a configuration of a battery module having a cell balance circuit.
• the battery module includes a plurality of single cells 100 to 100 (n is a natural number) connected in series,
• the cell balance circuit 200 includes a switch circuit 201 having a plurality of switches 201 to 201, and a plurality of switch circuits 201 to 201.
• the lines connecting the single cells 100 to 100 are respectively connected to the switches 201 to 201.
• I n 1 n-1 is commonly connected to one terminal of the voltage holding circuit 203 and the switches 202 to 2
• the other terminal of the voltage holding circuit 203 is connected in common through 02.
• the line connected to the negative terminal of the single cell 100 is connected to one terminal of the voltage holding circuit 203 via the switch 201.
• a power storage device including a battery module in which a plurality of single cells are connected in series as described in Patent Document 1 has a structure in which a desired voltage can be easily obtained.
• a cell balance circuit as shown in FIG. 2 the switches constituting each of the switch circuits 201 and 202 are required as many as the number of single cells 100 to 100 connected in series.
• the output voltage of the single cells connected in parallel is, for example, about 2.5V.
• the wiring on the input side of the booster circuit 200 and the wiring in the battery module 100 have 10 About double current (for example, 1 000A) flows.
• a large current flows in the wiring section between the battery and the booster circuit in this way, a large amount of heat is generated in the wiring section, and the generated heat passes through the terminals of the wiring force single cell to the inside of the single cell.
• the electrolyte in the single cell may deteriorate due to heat and the charge / discharge performance of the single cell may deteriorate.
• lithium ion secondary batteries which are generally used as single cells, have a structure that does not easily release heat (a structure that is difficult to cool). Become.
• a first object of the present invention is to provide a power storage device that can solve the first problem and can suppress deterioration in charge / discharge performance of a single cell due to the influence of heat generated during boosting. .
• a second object of the present invention is to provide a low-cost and small battery module that can also solve the second problem.
• the first aspect of the present invention provides an automobile power storage device including at least one battery and a DC-DC converter that boosts the output voltage of the battery to a desired voltage.
• the battery is composed of a laminated lithium ion battery.
• Laminated lithium-ion batteries are superior in heat dissipation compared to lithium-ion secondary batteries that are generally used as single cells, and are less susceptible to heat from the wiring section.
• the battery when the output voltage of the battery is boosted to a large voltage of 300 V by a DC-DC converter by utilizing the excellent heat dissipation of this laminated lithium ion battery, the battery If the charge / discharge performance of the battery deteriorates due to the effect of heat generated in the wiring section (wiring that connects the battery and the DC-DC converter, etc.), it solves a new problem that has never been a problem. .
• the first aspect of the present invention by using a laminated lithium ion battery, even if the heat generated in the wiring section at the time of boosting is transferred to the battery, it is dissipated by the battery. Therefore, deterioration of the charge / discharge performance of the battery due to the influence of heat can be suppressed.
• the deterioration of the charge / discharge performance of the single cell due to the influence of heat generated at the time of boosting can be suppressed. It is possible to provide a power storage device that can stably supply the battery and that has a long battery life.
• the second aspect of the present invention is connected in series in the automobile power storage device of the first aspect.
• the cell balance circuit adjusts the capacity balance between the cell blocks connected in series. Therefore, when the charge and discharge are continuously repeated, some of the cell blocks Will not be overcharged or overdischarged.
• the cell block in which a plurality of batteries are connected in parallel, a voltage is equally supplied to each battery, and a current is also supplied to each battery power equally. In this way, the cell block itself can be configured to adjust the capacity balance between the batteries.
• the scale of the cell balance circuit is determined by the number of cell blocks connected in series.
• the DC-DC converter since the DC-DC converter is provided, the voltage can be lowered on the input side, and therefore the number of cell blocks is much smaller than that in the case of not using the DC-DC converter. Therefore, the scale of the cell balance circuit can be made smaller than that of the conventional battery module.
• conventional battery modules When 100 single cells are connected in series in Joule, the cell balance circuit will adjust the capacity balance between the 100 single cells connected in series.
• the cell balance circuit can reduce the capacity noise of 50 cell blocks connected in series. Will be adjusted. In this case, the scale of the cell balance circuit is reduced by half.
• the scale of the cell balance circuit can be significantly reduced, it is possible to provide a battery module that is smaller and less expensive than the conventional one.
• a plurality of the batteries are connected in series, and the capacity balance between the batteries is It further has a Senore balance circuit for adjusting.
• a single cell having N times the capacity instead of a cell block in which N single cells are connected in parallel, a single cell having N times the capacity may be used.
• the voltage on the input side is set to 1ZN with respect to the desired voltage, and a single cell having N times the capacity is used.
• the number of single cells connected in series can be reduced as compared with the prior art, and the scale of the cell balance circuit can be reduced accordingly.
• the effect of heat due to the increase in current can be kept low because it is a laminated battery with good heat dissipation.
• FIG. 1 is a block diagram showing a configuration of a conventional power storage device.
• FIG. 2 is a block diagram showing a configuration of a conventional battery module having a cell balance circuit.
• FIG. 3 is a block diagram showing a configuration of a power storage device according to the first embodiment of the present invention.
• FIG. 4 is an exploded perspective view of a film-clad battery that is a laminated battery applied to the single cell shown in FIG.
• FIG. 5 is a perspective view showing the configuration of the battery module shown in FIG.
• FIG. 6 is a schematic cross-sectional view near the opening of the support member shown in FIG.
• FIG. 7 is a block diagram showing a configuration of a power storage device according to a second embodiment of the present invention. Explanation of symbols [0025] 10 battery module
• FIG. 3 is a block diagram showing a configuration of the power storage device according to the first embodiment of the present invention.
• the power storage device includes a battery module 10 composed of a plurality of single cells 30 connected in parallel, and a D for converting the output voltage of the battery module 10 into a desired voltage.
• the DC-DC converter 20 can be an existing boost type DC-DC converter.
• the single cell 30 is composed of a laminated battery.
• FIG. 4 is an exploded perspective view of a film-clad battery that is a laminated battery.
• a film-clad battery 1 shown in FIG. 4 includes an electrode laminate 2 having a structure in which a plurality of positive plates and a plurality of negative plates are laminated via a separator, and the electrode laminate 2 is sealed together with an electrolytic solution.
• Two outer films 4, 5 and a positive electrode tab 3a and a negative electrode tab 3b respectively connected to the positive electrode plate and the negative electrode plate of the electrode laminate 2 in a state where the front end portions are extended from the outer film 4, 5 Have
• the exterior films 4 and 5 enclose and sandwich the electrode laminate 2 from both sides in the thickness direction (lamination direction), and thus have a planar dimension larger than the planar dimension of the electrode laminate 2.
• the electrode laminate 2 is sealed by heat-sealing the opposing surfaces that overlap each other around the electrode laminate 2.
• the heat-sealed region of the exterior films 4 and 5 is indicated by hatching as the heat-sealed portion 6.
• Each exterior film 4, 5 has cup portions 4 a, 5 a in the central region in order to form a space surrounding the electrode laminate 2.
• the heat-sealing part 6 is formed over the entire circumference of the cup parts 4a, 5a.
• the cups 4a and 5a can be processed by deep drawing. In the example shown in FIG. 2, the force that forms the cup parts 4a and 5a on each of the exterior films 4 and 5 may be formed only on one of the exterior films, or the cup part may be formed. Alternatively, the electrode laminate 2 may be surrounded using the flexibility of the exterior films 4 and 5.
• a laminate film can be preferably used.
• a film having flexibility and capable of sealing the electrode laminate 2 by heat fusion so that the electrolyte does not leak is used.
• a heat-bonded resin layer made of heat-bondable resin, a non-breathable layer made of metal, such as a metal thin film, and a protective layer made of a film made of polyester or nylon, such as polyethylene terephthalate are laminated in this order. The thing which was done is mentioned.
• a protective layer is provided as necessary.
• the metal thin film constituting the non-breathing layer for example, a foil of Al, Ti, Ti alloy, Fe, stainless steel, Mg alloy or the like having a thickness of 10 to: LOO / zm can be used.
• the resin constituting the heat-bonded resin layer include polypropylene, polyethylene, these acid-modified products, polyester such as polyethylene sulfide and polyethylene terephthalate, polyamide, and ethylene vinyl acetate copolymer. Can be used.
• the thickness of the heat-fusible resin layer is preferably 10 ⁇ m to 200 ⁇ m, more preferably 30 ⁇ m to 100 ⁇ m.
• the above-described film-clad battery has a structure with a high power density and is difficult to generate heat, and can supply a large current as compared with a nickel-hydrogen battery or the like that is currently popular.
• a typical example of this film-clad battery is a laminated manganese-based lithium ion battery.
• the battery module 10 having a structure easy to cool is realized by using the film-clad battery shown in FIG. Specifically, as shown in FIG. 5, the battery module 10 has a plurality of film-clad batteries 1 in a state where they are arranged at intervals so that their surfaces (the surfaces of the cup portions 4a and 5a) face each other.
• the structure is supported by the support member 7.
• the support member 7 is formed with an opening 7 a that communicates with a gap formed between the film-clad batteries 1.
• a material that can sufficiently obtain electrical insulation from the positive electrode tab 3a and the negative electrode tab 3b for example, a resin is used.
• FIG. 6 schematically shows a schematic cross-sectional structure in the vicinity of the opening 7 a of the support member 7.
• the supporting member 7 has a structure in which a plurality of pairs of frame members 71 and 72 that support the film-covered battery 1 are sandwiched by sandwiching the peripheral portions of the exterior films 4 and 5 from above and below. Openings 7a are formed on the contact surfaces of the frame member 72 that supports the film-clad battery 1 and the frame member 71 that is placed underneath and supports another film-clad battery 1. A notch is provided. By arranging the frame member 72 and the frame member 71 so as to overlap each other, the opening 7a is formed by the notches formed in the respective contact surfaces.
• Air can be sent into the gap formed between the external force film-clad batteries 1 through the opening 7a.
• the arrows in Fig. 6 indicate the air flow. When the air flowing in from the outside hits the surface of the film external battery 1, the film exterior battery 1 is cooled.
• the power storage device of the present embodiment for example, when the output voltage of the battery module 10 is boosted to about 300V by the DC-DC converter 20, a current of about 1000A is supplied to the wiring in the battery module 10. Even if a large amount of heat is generated in the wiring part and the generated heat is transmitted to the single cell 30, the single cell 30 is cooled by the air that has also flowed in external force through the opening 7a. It is possible to suppress the deterioration of single cell performance due to the influence.
• the film-clad battery 1 itself which is a single cell 30, is generally used as a single cell and has better heat dissipation than a lithium ion secondary battery. Not easily affected.
• the power storage device according to the present embodiment has a battery module structure with excellent heat dissipation. Therefore, the power storage device is less affected by the heat generated at the time of boosting than the conventional one and can supply more stable power. It is.
• the battery module of the present embodiment described above is an example of the present invention, and the configuration thereof can be changed as appropriate.
• the support member 7 is not limited to the configuration shown in FIGS.
• the support member 7 can support a plurality of laminated single cells connected in parallel in a state of being spaced apart so that their surfaces face each other, and between the single cells. Any configuration having an opening communicating with the gap to be formed may be used.
• the number of single cells connected in parallel is not particularly limited and can be appropriately changed according to the design.
• a laminate type battery is generally used as compared with a lithium ion secondary battery. Since a large current can flow because of its good heat dissipation, instead of connecting N single cells in parallel, the battery module may be composed of one single cell having N times the capacity.
• Single cells may be connected in series! /.
• FIG. 7 is a block diagram showing a configuration of a power storage device according to the second embodiment of the present invention.
• the power storage device of this embodiment includes a battery module composed of a plurality of cell blocks 10 to 10 (n is a natural number) connected in series, and a capacity variation between these cell blocks.
• the DC-DC converter 20 boosts or lowers the output voltage of the cell blocks connected in series to a desired voltage.
• This DC-DC converter 40 can obtain a desired output voltage by stepping up or down the output of the battery module to a desired voltage.
• Each of the cell blocks 10 to 10 includes a plurality of single cells 30 connected in parallel.
• the single cell 30 is a rechargeable battery represented by a lithium ion secondary battery.
• the cell balance circuit 40 includes a switch circuit 21 having a plurality of switches 21 to 21 and a plurality of switches.
• Switch circuit 22 consisting of 22 to 22 forces, and voltage holding circuit 23 composed of capacitors,
• the other terminal of the voltage holding circuit 23 is commonly connected through 1 n.
• a line in which the negative terminal of each single cell of the cell block 10 is connected in common is connected to one terminal of the voltage holding circuit 23 via the switch 21.
• the line connected in common is connected to the other terminal of the voltage holding circuit 23 via the switch 22.
• a control circuit (not shown) controls the on / off of each switch of the switch circuits 21 and 22, so that the capacity balance between the cell blocks 10 to 10 is controlled.
• each cell block 10 to 10 a plurality of single cells 30 are connected in parallel.
• each cell block 10 ⁇ : L0 itself is
• the number of switches constituting the switch circuits 21 and 22 is reduced accordingly. Can be reduced.
• the number of switches can be greatly reduced, and the circuit scale of the cell balance circuit 40 can be reduced.
• the cell balance circuit can be a circuit using the size and number of resistance elements that use resistors or coils, and the size and number of coil elements that are used. The merit that can be reduced is obtained similarly.
• the power storage device of the present embodiment uses a cell block in which single cells are connected in parallel, the supplyable electric flow rate is larger than a conventional battery module in which all cells are connected in series. . Therefore, a laminated battery capable of supplying a large current is used for the single cell 30.
• the film-clad battery described in the first embodiment can be applied.
• This film-clad battery has a high power density and a structure that hardly generates heat, and can supply a large current as compared with the nickel hydrogen battery that is currently popular.
• a laminated manganese-based battery There are lithium ion batteries.
• a power storage device suitable for driving an electric vehicle such as an electric vehicle or a hybrid vehicle can be realized.
• the battery module of the present embodiment described above is an example of the present invention, and the configuration thereof can be changed as appropriate.
• the number of single cells constituting a cell block may be two or more.
• the number of cell blocks is not particularly limited and may be two or more.
• the configuration of the cell balance circuit is not limited to the circuit configuration shown in FIG. 1, and a cell balance circuit having another configuration may be used.
• a laminated battery is generally used and can flow a large current with better heat dissipation than a lithium ion secondary battery. Therefore, instead of a cell block in which N single cells are connected in parallel, Alternatively, a single cell having N times the capacity may be used. In this case, the number of single cells connected in series can be reduced by using single cells having N times the capacity, and the scale of the cell balance circuit can be reduced accordingly. it can.
• the single cells may be constituted by conventional lithium ion secondary batteries. Even in this configuration, the effect of reducing the scale of the cell balance circuit can be obtained as compared with the conventional power storage device.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Sustainable Development (AREA)
• Sustainable Energy (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Manufacturing & Machinery (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Battery Mounting, Suspending (AREA)
• Charge And Discharge Circuits For Batteries Or The Like (AREA)
• Secondary Cells (AREA)
• Electric Propulsion And Braking For Vehicles (AREA)
• Sealing Battery Cases Or Jackets (AREA)

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• 2006
  • 2006-12-18 WO PCT/JP2006/325196 patent/WO2007072781A1/ja not_active Ceased
  • 2006-12-18 JP JP2007551077A patent/JPWO2007072781A1/ja active Pending
• 2012
  • 2012-12-07 JP JP2012268279A patent/JP5609961B2/ja active Active

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