WO2018198895A1 - Batterie secondaire, bloc-batterie, véhicule électrique, système de stockage d'électricité, outil électrique, et appareil électronique - Google Patents

Batterie secondaire, bloc-batterie, véhicule électrique, système de stockage d'électricité, outil électrique, et appareil électronique Download PDF

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Publication number
WO2018198895A1
WO2018198895A1 PCT/JP2018/015957 JP2018015957W WO2018198895A1 WO 2018198895 A1 WO2018198895 A1 WO 2018198895A1 JP 2018015957 W JP2018015957 W JP 2018015957W WO 2018198895 A1 WO2018198895 A1 WO 2018198895A1
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Prior art keywords
secondary battery
negative electrode
heat
heat conduction
stacked
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PCT/JP2018/015957
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English (en)
Japanese (ja)
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水野　守
元気 遠藤
高木　良介
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株式会社村田製作所
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Publication of WO2018198895A1 publication Critical patent/WO2018198895A1/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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • 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
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/623—Portable devices, e.g. mobile telephones, cameras or pacemakers
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/623—Portable devices, e.g. mobile telephones, cameras or pacemakers
    • H01M10/6235—Power tools
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/627—Stationary installations, e.g. power plant buffering or backup power supplies
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/647—Prismatic or flat cells, e.g. pouch cells
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/651—Means for temperature control structurally associated with the cells characterised by parameters specified by a numeric value or mathematical formula, e.g. ratios, sizes or concentrations
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/654—Means for temperature control structurally associated with the cells located inside the innermost case of the cells, e.g. mandrels, electrodes or electrolytes
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6561—Gases
    • H01M10/6562—Gases with free flow by convection only
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
    • H01M50/103—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/227—Organic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/231—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks having a layered structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/284—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with incorporated circuit boards, e.g. printed circuit boards [PCB]
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present technology relates to a secondary battery including a positive electrode and a negative electrode that are alternately stacked via separators, and a battery pack, an electric vehicle, an electric power storage system, an electric tool, and an electronic device using the secondary battery.
  • Secondary batteries are not limited to the electronic devices described above, but are also being considered for other uses.
  • a battery pack detachably mounted on an electronic device, an electric vehicle such as an electric vehicle, an electric power storage system such as a household electric power server, and an electric tool such as an electric drill.
  • a stacked secondary battery As a secondary battery, a stacked secondary battery is known. This stacked secondary battery includes positive and negative electrodes that are alternately stacked via separators. Various studies have been made on the structure of a stacked secondary battery.
  • a heat radiating member is provided between layers of the multilayer structure constituting the electrode assembly (for example, see Patent Document 1).
  • the present technology has been made in view of such problems, and an object thereof is to provide a secondary battery, a battery pack, an electric vehicle, an electric power storage system, an electric tool, and an electronic device that can improve safety. It is in.
  • a secondary battery includes a stacked unit including positive and negative electrodes that are alternately stacked via separators, and a stacked unit that is provided in the stacked unit so as to extend in the stacking direction of the positive and negative electrodes. And a heat conducting part that conducts heat generated in the stacking direction.
  • Each of the battery pack, the electric vehicle, the power storage system, the electric tool, and the electronic device according to the embodiment of the present technology includes a secondary battery, and the secondary battery includes the secondary battery according to the embodiment of the present technology described above. It has the same configuration.
  • the laminated portion is provided with a heat conducting portion that extends in the lamination direction of the positive electrode and the negative electrode and conducts heat in the lamination direction, thereby improving safety. Can be made.
  • similar effects can be obtained in each of the battery pack, the electric vehicle, the power storage system, the electric tool, and the electronic device according to the embodiment of the present technology.
  • effect described here is not necessarily limited, and may be any effect described in the present technology.
  • FIG. 2 is a cross-sectional view illustrating a configuration of a secondary battery along the line AA illustrated in FIG. 1.
  • FIG. 2 is a cross-sectional view illustrating a configuration of a secondary battery along the line BB illustrated in FIG. 1.
  • FIG. 11 is a cross-sectional view illustrating a configuration of a secondary battery along the line AA illustrated in FIG. 10. It is a perspective view showing the 1st modification regarding the structure of the secondary battery of 2nd Embodiment. It is another perspective view showing the 1st modification regarding the structure of the secondary battery of 2nd Embodiment. It is sectional drawing showing the 2nd modification regarding the structure of the secondary battery of 2nd Embodiment.
  • FIG. 17 is a cross-sectional view illustrating a configuration of a secondary battery along the line AA illustrated in FIG. 16. It is a perspective view showing the structure of the secondary battery of 3rd Embodiment of this technique.
  • FIG. 19 is a cross-sectional view illustrating a configuration of a secondary battery along line AA illustrated in FIG. 18. It is sectional drawing showing the 1st modification regarding the structure of the secondary battery of 3rd Embodiment. It is sectional drawing showing the 2nd modification regarding the structure of the secondary battery of 3rd Embodiment.
  • FIG. 1 It is a perspective view showing the structure of the application example (battery pack: single cell) of a secondary battery. It is a block diagram showing the structure of the battery pack shown in FIG. It is a block diagram showing the structure of the application example (battery pack: assembled battery) of a secondary battery. It is a block diagram showing the structure of the application example (electric vehicle) of a secondary battery. It is a block diagram showing the structure of the application example (electric power storage system) of a secondary battery. It is a block diagram showing the structure of the application example (electric tool) of a secondary battery.
  • Secondary battery (first embodiment) 1-1. Overall configuration 1-2. Configuration of laminated part 1-3. Configuration of heat conduction section 1-4. Operation 1-5. Manufacturing method 1-6. Action and Effect 1-7. Modification 2 Secondary battery (second embodiment) 2-1. Configuration 2-2. Operation 2-3. Manufacturing method 2-4. Action and effect 2-5. Modified example 2. Secondary battery (third embodiment) 3-1. Configuration 3-2. Operation 3-3. Manufacturing method 3-4. Action and Effect 3-5. Modified example 4. 4. Combination of a series of configurations and a series of modifications Applications of secondary batteries 5-1. Battery pack (single cell) 5-2. Battery pack (assembled battery) 5-3. Electric vehicle 5-4. Electric power storage system 5-5. Electric tool
  • the secondary battery described here is a so-called stacked secondary battery.
  • the type of the secondary battery is not particularly limited, and is, for example, a lithium ion secondary battery that can obtain a battery capacity by utilizing a lithium absorption phenomenon and a lithium release phenomenon.
  • FIG. 1 shows a perspective configuration of the secondary battery.
  • 2 shows a cross-sectional configuration of the secondary battery along the line AA shown in FIG. 1
  • FIG. 3 shows a cross-sectional configuration of the secondary battery along the line BB shown in FIG. Represents.
  • the cross section shown in each of FIG. 2 and FIG. 3 is a cross section along the XZ plane.
  • This secondary battery includes, for example, a battery element 20 inside an exterior member 10 as shown in FIGS.
  • the battery element 20 is impregnated with an electrolytic solution that is a liquid electrolyte, and is connected to a positive electrode lead 50 and a negative electrode lead 60.
  • the exterior member 10 is a storage member that stores the battery element 20.
  • the exterior member 10 is, for example, a laminate film.
  • the configuration of the laminate film is not particularly limited, for example, it has a multilayer structure in which a fusion layer, a metal layer, and a surface protective layer are laminated in this order.
  • the fusion layer is, for example, any one kind or two or more kinds of films such as polyethylene and polypropylene.
  • the metal layer is, for example, any one or more of metal foils such as aluminum foil.
  • the surface protective layer is, for example, one or more of films such as nylon and polyethylene terephthalate.
  • an aluminum laminated film in which a polyethylene film, an aluminum foil, and a nylon film are laminated in this order is preferable.
  • the exterior member 10 may be a laminate film having another multilayer structure, for example.
  • the exterior member 10 may be a film such as polypropylene or a metal foil such as an aluminum foil.
  • the exterior member 10 is folded so that the fusion layers face each other via the battery element 20, the outer peripheral edges of the fusion layers are fused to each other.
  • the exterior member 10 is sealed.
  • the two exterior members 10 are stacked so that the fusion layers face each other via the battery element 20, the outer peripheral edges of the fusion layers are fused to each other.
  • the exterior member 10 is sealed.
  • the fusion layers may be bonded to each other through an adhesive or the like, for example.
  • the battery element 20 is an element that causes a charge / discharge reaction to proceed, and includes a positive electrode 31, a negative electrode 32, a separator 33, an electrolytic solution, and the like.
  • the battery element 20 includes a laminated part 30 and a heat conducting part 40 provided in the laminated part 30, and the laminated part 30 includes a positive electrode 31, a negative electrode 32, a separator 33, and an electrolytic solution.
  • the electrolytic solution is mainly impregnated in the positive electrode 31, the negative electrode 32, the separator 33, and the like that constitute the laminated portion 30.
  • the positive electrode lead 50 is one wiring for energizing the battery element 20.
  • One end of the positive electrode lead 50 is connected to, for example, a positive electrode 31 (a positive electrode current collector 31A described later) of the battery element 20, and the other end of the positive electrode lead 50 is connected to, for example, the exterior member 10 Derived from inside to outside.
  • the positive electrode lead 50 includes one or more of conductive materials such as aluminum.
  • the negative electrode lead 60 is the other wiring for energizing the battery element 20.
  • One end of the negative electrode lead 60 is connected to, for example, the negative electrode 32 (negative electrode current collector 32A described later) of the battery element 20, and the other end of the negative electrode lead 60 is connected to, for example, the exterior member 10 Derived from inside to outside.
  • the direction in which the negative electrode lead 60 is led out from the exterior member 10 is, for example, the same direction as the direction in which the positive electrode lead 50 is led out from the exterior member 10.
  • the negative electrode lead 60 includes any one type or two or more types of conductive materials such as copper.
  • the positive electrodes 31 and the negative electrodes 32 are alternately stacked via separators 33. That is, the positive electrode 31 and the negative electrode 32 are alternately arranged in the stacking direction of the positive electrode 31 and the negative electrode 32 (Z-axis direction shown in FIGS. 1 to 3), and between the positive electrode 31 and the negative electrode 32 adjacent to each other. A separator 33 is interposed. For this reason, the positive electrode 31 and the negative electrode 32 are separated from each other via the separator 33.
  • the number of positive electrodes 31 and the number of negative electrodes 32 are not particularly limited. For this reason, the number of the positive electrodes 31 may be one, or two or more. Further, the number of the negative electrodes 32 may be one, or two or more. In each of FIGS. 2 and 3, for example, the number of positive electrodes 31 and the number of negative electrodes 32 are three in order to simplify the illustration.
  • the positive electrode 31 includes, for example, a positive electrode current collector 31A and a positive electrode active material layer 31B provided on both surfaces of the positive electrode current collector 31A.
  • the positive electrode active material layer 31B may be provided on only one surface of the positive electrode current collector 31A, for example.
  • the positive electrode current collector 31A includes, for example, any one or more of conductive materials such as aluminum.
  • the positive electrode active material layer 31B includes, for example, any one type or two or more types of positive electrode active materials capable of inserting and extracting lithium. However, the positive electrode active material layer 31B may further include any one kind or two or more kinds of other materials such as a positive electrode binder and a positive electrode conductive agent.
  • the positive electrode active material includes, for example, a lithium-containing compound, and the lithium-containing compound includes, for example, a lithium-containing composite oxide and a lithium-containing phosphate compound.
  • the lithium-containing composite oxide is an oxide containing lithium and one or more transition metal elements as constituent elements.
  • the transition metal element include nickel, cobalt, manganese, and iron.
  • the crystal structure of the lithium-containing composite oxide is, for example, a layered rock salt type or a spinel type.
  • the lithium-containing composite oxide is, for example, LiNiO 2 , LiCoO 2 and LiMn 2 O 4 .
  • the lithium-containing phosphate compound is a phosphate compound containing lithium and one or more kinds of transition metal elements as constituent elements, and details regarding the transition metal element have been described with respect to, for example, a lithium-containing composite oxide. Same as the case.
  • the crystal structure of the lithium-containing phosphate compound is, for example, an olivine type.
  • the lithium phosphate compound is, for example, LiFePO 4 and LiMnPO 4 .
  • the positive electrode active material may contain, for example, oxides, disulfides, chalcogenides, and conductive polymers.
  • oxides include titanium oxide, vanadium oxide, and manganese dioxide.
  • disulfide include titanium disulfide and molybdenum sulfide.
  • chalcogenide is niobium selenide.
  • conductive polymer include sulfur, polyaniline, and polythiophene.
  • the positive electrode binder contains, for example, any one or more of synthetic rubber and polymer compound.
  • synthetic rubber include styrene butadiene rubber, fluorine rubber, and ethylene propylene diene.
  • polymer compound include polyvinylidene fluoride and polyimide.
  • the positive electrode conductive agent includes, for example, one or more of carbon materials.
  • the carbon material include graphite, carbon black, acetylene black, and ketjen black.
  • the positive electrode conductive agent may be, for example, a metal material and a conductive polymer.
  • the negative electrode 32 includes, for example, a negative electrode current collector 32A and a negative electrode active material layer 32B provided on both surfaces of the negative electrode current collector 32A.
  • the negative electrode active material layer 32B may be provided on only one surface of the negative electrode current collector 32A, for example.
  • the negative electrode current collector 32A includes, for example, any one or more of conductive materials such as copper.
  • the negative electrode active material layer 32B includes, for example, any one type or two or more types of negative electrode active materials capable of inserting and extracting lithium. However, the negative electrode active material layer 32B may further include any one kind or two or more kinds of other materials such as a negative electrode binder and a negative electrode conductive agent.
  • the capacity of the negative electrode active material that can be charged is, for example, higher than the discharge capacity of the positive electrode 31. It is set to be large. That is, the electrochemical equivalent of the negative electrode active material capable of inserting and extracting lithium is set to be larger than the electrochemical equivalent of the positive electrode 31, for example.
  • the negative electrode active material includes, for example, a carbon material.
  • examples of the carbon material include graphitizable carbon, non-graphitizable carbon, and graphite.
  • the negative electrode active material includes, for example, a metal-based material.
  • This metal-based material is a generic name for materials containing one or more of metal elements and metalloid elements as constituent elements.
  • the metal-based material may be, for example, a simple substance, an alloy, a compound, two or more of them, or a material containing one or more of these phases. But you can.
  • This alloy may be, for example, an alloy containing two or more kinds of metal elements, an alloy containing one or more kinds of metal elements and one or more kinds of metalloid elements, or one kind together with one or more kinds of metal elements.
  • An alloy containing the above nonmetallic elements may be used.
  • metal element and metalloid element examples include magnesium, boron, aluminum, gallium, indium, silicon, germanium, tin, lead, bismuth, cadmium, silver, zinc, hafnium, zirconium, yttrium, palladium and platinum. Among these, one or both of silicon and tin is preferable.
  • the negative electrode active material may include, for example, both a carbon material and a metal-based material.
  • the separator 33 allows lithium ions to pass between the positive electrode 31 and the negative electrode 32 while preventing a short circuit of current due to contact between the positive electrode 31 and the negative electrode 32.
  • the separator 33 is, for example, a porous film including any one kind or two kinds or more of synthetic resin and ceramic, and may be a laminated film in which two or more kinds of porous films are laminated.
  • the synthetic resin include polytetrafluoroethylene, polypropylene, and polyethylene.
  • the electrolytic solution contains, for example, a nonaqueous solvent and an electrolyte salt. Only one type of nonaqueous solvent may be used, or two or more types may be used. Only one type of electrolyte salt may be used, or two or more types may be used. However, the electrolytic solution may further include any one or more of other materials such as various additives.
  • the non-aqueous solvent contains, for example, a cyclic carbonate ester, a chain carbonate ester, a lactone, a chain carboxylate ester and the like.
  • the cyclic carbonate is, for example, ethylene carbonate, propylene carbonate, butylene carbonate, or the like.
  • the chain ester carbonate include dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, and methyl propyl carbonate.
  • the lactone include ⁇ -butyrolactone and ⁇ -valerolactone.
  • chain carboxylic acid ester examples include methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, methyl isobutyrate, methyl trimethyl acetate, and ethyl trimethyl acetate.
  • the non-aqueous solvent may contain, for example, an unsaturated cyclic carbonate, a halogenated carbonate, a dinitrile compound, a diisocyanate compound, a sulfonate ester, and an acid anhydride.
  • unsaturated cyclic carbonate include vinylene carbonate, vinyl ethylene carbonate, and methylene ethylene carbonate.
  • Halogenated carbonates include, for example, 4-fluoro-1,3-dioxolan-2-one, 4,5-difluoro-1,3-dioxolan-2-one, fluoromethyl methyl carbonate, bis (fluoromethyl) carbonate and Such as difluoromethyl methyl carbonate.
  • Examples of the dinitrile compound include succinonitrile, glutaronitrile, adiponitrile, sebaconitrile, phthalonitrile, and the like.
  • Examples of the diisocyanate compound include OCN—C 6 H 12 —NCO.
  • Examples of the sulfonic acid ester include 1,3-propane sultone and 1,3-propene sultone.
  • Examples of the acid anhydride include succinic anhydride, glutaric anhydride, maleic anhydride, ethanedisulfonic anhydride, propane disulfonic anhydride, sulfobenzoic anhydride, sulfopropionic anhydride, and sulfobutyric anhydride.
  • the electrolyte salt is, for example, a lithium salt.
  • the lithium salt includes, for example, lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ), lithium bis (fluorosulfonyl) imide (LiN (SO 2 F) 2 ), Bis (trifluoromethanesulfonyl) imidolithium (LiN (CF 3 SO 2 ) 2 ), lithium difluorophosphate (LiPF 2 O 2 ), lithium fluorophosphate (Li 2 PFO 3 ) and the like.
  • the content of the electrolyte salt is not particularly limited, but among them, it is preferably 0.3 mol / kg to 3.0 mol / kg with respect to the non-aqueous solvent.
  • the positive electrode lead 50 is connected to each of the two or more positive electrode current collectors 31A.
  • the secondary battery includes, for example, two or more positive electrode leads 50. Since two or more positive electrode leads 50 are stacked on each other, for example, they are combined into one lead as a whole.
  • the positive electrode lead 50 is the same for the negative electrode lead 60, for example. That is, when the stacked unit 30 includes two or more negative electrodes 32 (negative electrode current collector 32A), for example, the negative electrode lead 60 is connected to each of the two or more negative electrode current collectors 32A.
  • the secondary battery includes, for example, two or more negative electrode leads 60. Since two or more negative electrode leads 60 are stacked on each other, for example, they are combined so as to form one lead as a whole.
  • the battery element 20 mainly includes a heat conducting unit 40 for conducting (dissipating) heat generated in the stacked unit 30.
  • the heat conducting unit 40 is provided in the stacked unit 30 as described above.
  • the heat conducting unit 40 extends in the stacking direction (Z-axis direction) of the positive electrode 31 and the negative electrode 32, and conducts heat in the stacking direction. That is, in the case where the positive electrodes 31 and the negative electrodes 32 are alternately stacked via the separators 33, the heat conducting unit 40 has a direction along the respective surfaces (XY plane) of the positive electrodes 31 and the negative electrodes 32 (X-axis direction or It does not extend in the (Y-axis direction), but extends in the direction intersecting the surface (Z-axis direction).
  • stacking direction Z-axis direction
  • stacking direction Z-axis direction
  • the reason why the heat conducting portion 40 extending in the laminating direction is provided in the laminated portion 30 is that the heat conducting portion 40 exhibits an excellent heat dissipation function. Thereby, compared with the case where the heat conduction part 40 is not provided in the lamination
  • the configuration of the heat conduction unit 40 is not particularly limited as long as the heat generated in the lamination unit 30 can be conducted in the lamination direction.
  • a through hole 30 ⁇ / b> K extending in the stacking direction is provided in the stacked portion 30, and the heat conductor 41 is embedded in the through hole 30 ⁇ / b> K.
  • the heat conductive part 40 consists of the heat conductor 41 extended in the lamination direction.
  • the heat conductor 41 is adjacent to, for example, the exposed surface of the stacked portion 30 exposed inside the through-hole 30K, that is, the inner wall surface 30M of the stacked portion 30 inside the opening 40K. Thereby, the heat conductor 41 is thermally coupled to the stacked portion 30.
  • the heat conductor 41 embedded in the through hole 30K is covered with, for example, the exterior member 10.
  • the heat conductor 41 includes, for example, any one kind or two or more kinds of highly heat conductive materials.
  • the “high thermal conductivity material” is a material having a thermal conductivity higher than that of the laminated portion 30. That is, the thermal conductivity of the thermal conductor 41 in the stacking direction is higher than, for example, the thermal conductivity of the stacked unit 30 in the stacking direction.
  • the thermal conductivity of the high thermal conductivity material is not particularly limited, but is, for example, 1 W / m ⁇ K to 500 W / m ⁇ K.
  • the type of the high thermal conductivity material is not particularly limited, and examples thereof include a metal material, a polymer (resin) material, and a gel material.
  • the metal material is, for example, aluminum or copper.
  • polymer material examples include polycarbonate, polybutylene terephthalate, and polyamide.
  • the polymer material may be a derivative such as the above-described polycarbonate, or may be a composite material including two or more of the polycarbonates.
  • the gel material is, for example, a composite material including an electrolytic solution, a polymer material, and a ceramic material.
  • the details regarding the electrolytic solution are as described above, for example.
  • the kind of polymer material is not specifically limited, For example, it is a polyvinylidene fluoride etc.
  • the kind of ceramic material is not specifically limited, For example, it is aluminum oxide (alumina) etc.
  • the number of the heat conduction parts 40 (heat conductors 41) is not particularly limited.
  • the number of the heat conductive parts 40 may be only one, and may be two or more. This is because if only one heat conduction part 40 is provided in the laminated part 30, it is easier to dissipate heat compared to the case where the heat conduction part 40 is not provided in the laminated part 30.
  • the number of heat conducting portions 40 can be arbitrarily set according to conditions such as the amount of heat generated in the laminated portion 30, for example. In FIG. 1 and FIG. 2, for example, the case where the number of the heat conducting units 40 is one is shown.
  • the position of the heat conduction unit 40 (heat conductor 41) is not particularly limited.
  • the position of the heat conduction part 40 may be near the center in the plane (in the XY plane) of the laminated part 30, in the vicinity of the edge, or may be other than that. If the heat conduction part 40 is provided in the laminated part 30, it is easy to radiate heat without depending on the position of the heat conduction part 40 as compared with the case where the heat conduction part 40 is not provided in the laminated part 30. Because it becomes.
  • the position of the heat conducting unit 40 can be arbitrarily set according to conditions such as a heat generation distribution and a heat storage distribution in the plane of the stacked unit 30, for example. Especially, it is preferable that the position of the heat conductive part 40 is near the center in the plane of the laminated part 30. This is because heat tends to concentrate naturally in the vicinity of the center in the plane of the laminated portion 30, and heat is effectively radiated by disposing the heat conducting portion 40 in the vicinity of the center. In FIG. 1 and FIG. 2, for example, a case where the heat conducting unit 40 is arranged near the center in the plane of the stacked unit 30 is shown.
  • the three-dimensional shape of the heat conductor 41 is not particularly limited, and examples thereof include a prism and a cylinder.
  • the prism include a triangular prism, a quadrangular prism, and a pentagonal prism.
  • the cylinder is, for example, a true cylinder or an ellipse.
  • the opening shape of the through-hole 30K is not particularly limited, but is a shape corresponding to the three-dimensional shape of the heat conductor 41, for example. 1 and 2 show, for example, a case where the three-dimensional shape of the heat conductor 41 is a quadrangular prism and the opening shape of the through-hole 30K is a quadrangle.
  • the dimensions of the heat conductor 41 are not particularly limited.
  • the “dimension” is a dimension (width) in the X-axis direction, a dimension (length) in the Y-axis direction, and a dimension (thickness) in the Z-axis direction.
  • the dimensions of the heat conductor 41 can be arbitrarily set according to conditions such as the amount of heat generated in the stacked portion 30 and the dimensions of the battery element 20, for example.
  • the charge / discharge reaction proceeds in the stacked portion 30. Specifically, at the time of charging, for example, lithium ions are released from the positive electrode 31, and the lithium ions are occluded in the negative electrode 32 through the electrolytic solution. On the other hand, at the time of discharging, for example, lithium ions are released from the negative electrode 32 and the lithium ions are occluded in the positive electrode 31 through the electrolytic solution.
  • the stacked portion 30 since the stacked portion 30 generates heat as the charge / discharge reaction proceeds, heat is generated in the stacked portion 30.
  • This heat is conducted from the laminated part 30 to the heat conducting part 40 (thermal conductor 41), and further conducted inside the thermal conductor 41 in the extending direction (lamination direction). Thereby, the heat generated in the laminated part 30 is diffused (heat dissipated) in the heat conducting part 40.
  • a laminated body that is a precursor of the laminated part 30 is produced.
  • a positive electrode active material and, if necessary, a positive electrode binder and a positive electrode conductive agent are mixed to obtain a positive electrode mixture.
  • a positive electrode mixture slurry is obtained by dispersing the positive electrode mixture in an organic solvent or the like.
  • the positive electrode mixture slurry is dried to form the positive electrode active material layer 31B.
  • the positive electrode active material layer 31B is compression-molded using a roll press machine or the like. In this case, the positive electrode active material layer 31B may be heated, or compression molding may be repeated a plurality of times. Thereby, the positive electrode 31 is formed.
  • the positive electrode lead 50 is connected to the positive electrode current collector 31A using a welding method or the like.
  • the negative electrode active material layer 32B is formed on both surfaces of the negative electrode current collector 32A by the same procedure as that of the positive electrode 31 described above. Specifically, by mixing a negative electrode active material and, if necessary, a negative electrode binder and a negative electrode conductive agent, to make a negative electrode mixture, by dispersing the negative electrode mixture in an organic solvent or the like, A paste-like negative electrode mixture slurry is obtained. Subsequently, after applying the negative electrode mixture slurry to both surfaces of the negative electrode current collector 32A, the negative electrode mixture slurry is dried to form the negative electrode active material layer 32B. Finally, the negative electrode active material layer 32B is compression molded using a roll press machine or the like.
  • the negative electrode active material layer 32B may be heated, or compression molding may be repeated a plurality of times. Thereby, the negative electrode 32 is formed. After that, the negative electrode lead 60 is connected to the negative electrode current collector 32A using a welding method or the like.
  • the positive electrode 31 in which the positive electrode lead 50 is connected to the positive electrode current collector 31A and the negative electrode 32 in which the negative electrode lead 60 is connected to the negative electrode current collector 32A are alternately stacked via the separator 33. Thereby, a laminated body is formed.
  • the through-hole 30K extended in the lamination direction is formed by processing a laminated body using punches, such as a punch.
  • the heat conductor 41 is formed inside the through hole 30K.
  • the heat conductor 41 may be prepared separately, and the heat conductor 41 may be inserted into the opening 30K. Or you may form the heat conductor 41 so that the inside of the opening part 30K may be embed
  • the heat conductor 41 is adjacent to the inner wall surface 30M of the stacked portion 30 inside the through hole 30K.
  • each of the positive electrode lead 50 and the negative electrode lead 60 is led out from the inside of the exterior member 10 to the outside.
  • the laminate has a plurality of positive electrode leads 50 and a plurality of negative electrode leads 60, the plurality of positive electrode leads 50 are stacked on each other and the plurality of negative electrode leads 60 are stacked on each other.
  • the outer peripheral edge portions of one non-adhered side of the exterior member 10 are bonded to each other using a thermal fusion method or the like,
  • the exterior member 10 is sealed.
  • an electrolyte salt or the like is dissolved or dispersed in a non-aqueous solvent.
  • the laminated part 30 is formed by impregnating the laminated body (the positive electrode 31, the negative electrode 32, and the separator 33) with the electrolytic solution. Therefore, the battery element 20 including the stacked unit 30 and the heat conducting unit 40 (thermal conductor 41) is formed.
  • FIG. 4 shows a cross-sectional configuration of the secondary battery of the first comparative example, and corresponds to FIG.
  • FIG. 5 shows a cross-sectional configuration of the secondary battery of the second comparative example, and corresponds to FIG.
  • the secondary battery of the first comparative example is, for example, as shown in FIG. 4 except that it includes a heat conducting unit 70 instead of the heat conducting unit 40 (see FIG. 2). Reference)).
  • This heat conducting part 70 is replaced with the heat conductor 41 extending in the laminating direction (Z-axis direction), and one heat conducting layer extending in the in-plane direction (X-axis direction) intersecting the laminating direction. 71.
  • the heat conductive layer 71 is provided, for example, in the middle of the stacked structure of the stacked unit 30, and more specifically, is inserted between the separator 33 adjacent to the positive electrode 31 and the separator 33 adjacent to the negative electrode 32.
  • the material for forming the heat conductive layer 71 is the same as the material for forming the heat conductor 41, for example. For this reason, the heat conductive layer 71 can exhibit a heat dissipation function in the same manner as the heat conductor 41.
  • the secondary battery of the second comparative example is the secondary battery of the above-described first comparative example (except for the fact that the heat conducting portion 70 is composed of five heat conducting layers 71 as shown in FIG. (See FIG. 4).
  • the stacked portion 30 when the secondary battery is used, the stacked portion 30 generates heat during the charge / discharge reaction, and thus heat is easily stored in the stacked portion 30.
  • the tendency to store heat in the stacked portion 30 becomes particularly prominent in the vicinity of the center in the plane of the stacked portion 30. This is because the charge / discharge reaction is likely to proceed smoothly and sufficiently near the center in the plane of the stacked portion 30.
  • the heat conduction part 70 (one heat conduction layer 71) is provided in the laminated part 30, the heat generated in the laminated part 30 is the one heat conduction. Heat is dissipated using the layer 71.
  • the heat conductive layer 71 does not extend in the stacking direction, the heat generated in the stacked portion 30 is not easily dissipated even if the heat conductive layer 71 is used. This is because the heat conduction layer 71 is provided in the middle of the laminated structure of the laminated portion 30, and therefore, heat radiation is easily performed in a place near the heat conductive layer 71 inside the laminated portion 30, but is far from the heat conductive layer 71. This is because it is difficult to radiate heat at the place. In this case, the amount of heat dissipation (or heat dissipation efficiency) becomes non-uniform in the stacking direction, so that heat is partially stored easily in the stacked portion 30. Thereby, since it becomes difficult to dissipate heat enough as the whole laminated part 30, the temperature of the laminated part 30 tends to rise excessively locally. Therefore, it is difficult to improve the safety of the secondary battery.
  • the heat conduction part 70 (five heat conduction layers 71) is provided in the laminated part 30, so that the heat generated in the laminated part 30 is the five heat conductions. Heat is dissipated using the layer 71.
  • each of the heat conductive layers 71 extends in a direction intersecting with the stacking direction, but the five heat conductive layers 71 are arranged in the stacking direction. Unlike the secondary battery, the heat dissipation amount is almost uniform in the stacking direction.
  • the heat conductive layer 71 serving as a heat dissipation path is provided in the stacked structure of the stacked unit 30, the heat conducted to the heat conductive layer 71 still remains in the stacked unit 30. Become. In this case, since the heat generated in the stacked unit 30 is only dispersed inside the stacked unit 30, heat is still easily stored in a part of the stacked unit 30 depending on the amount of heat generated. As a result, the entire laminated portion 30 is also not easily dissipated sufficiently, and the temperature of the laminated portion 30 still tends to rise excessively locally. Therefore, it is difficult to improve the safety of the secondary battery.
  • the heat conductor 41 extends in the stacking direction. Therefore, the heat generated in the stacked portion 30 is sufficiently radiated using the heat conductor 41. This is because the heat conductor 41 is proximate to all the positive electrodes 31 and all the negative electrodes 32, and thus is easily radiated without depending on the heat generation location in the stacking direction. In this case, since the amount of heat radiation becomes substantially uniform in the stacking direction, the entire stacked portion 30 is easily radiated sufficiently.
  • the heat generated in the stacked unit 30 is conducted to the outside of the stacked unit 30 (thermal conductor 41), and therefore does not stay inside the stacked unit 30. Thereby, since it becomes difficult to store heat in the laminated portion 30 without depending on the amount of heat generated, the entire laminated portion 30 is more easily dissipated.
  • the temperature of the stacked portion 30 is hardly increased excessively as a whole. Therefore, the safety of the secondary battery can be improved.
  • the through hole 30K extending in the laminating direction is provided in the laminated portion 30, and the heat conductor 41 is embedded in the opening 30K, the inner wall surface of the laminated portion 30 inside the opening 30K.
  • the heat conductor 41 is adjacent to 30M. Therefore, since the heat generated in the stacked portion 30 is sufficiently dissipated using the heat conductor 41 without depending on the position in the stacking direction, a higher effect can be obtained.
  • the heat conductor 41 includes a highly heat conductive material, that is, if the heat conductivity of the heat conductor 41 in the stacking direction is higher than the heat conductivity of the stacked portion 30 in the stacking direction, the heat conduction is performed. Since heat is more easily conducted in the body 41, a higher effect can be obtained.
  • the number of the heat conducting portions 40 (heat conductors 41) is one.
  • the number of the heat conducting portions 40 is not particularly limited and can be arbitrarily changed.
  • the position of the heat conducting unit 40 is not particularly limited, and can be arbitrarily changed.
  • the number of the heat conducting portions 40 may be two or more.
  • the dimensions (for example, width and length) of the heat conductor 41 may be changed as appropriate.
  • the number of the heat conduction portions 40 is four, and four heat conduction portions 40 are arranged in the vicinity of the four corners in the plane of the stacked portion 30.
  • the four heat conductors 41 have the same volume so that the volume of one heat conductor 41 shown in FIG. 1 is equal to the total volume of the four heat conductors 41 shown in FIG. The dimensions (width and length) of the body 41 are adjusted.
  • the number of the heat conduction parts 40 is six, and the six heat conduction parts 40 are arranged so as to be arranged in a matrix of 2 rows ⁇ 3 columns.
  • the heat conduction of the six heat conductors 41 shown in FIG. 1 is equal to the total volume of the six heat conductors 41 shown in FIG. The dimensions (width and length) of the body 41 are adjusted.
  • the secondary battery includes, for example, one heat conduction unit 40 (two heat conductors 41).
  • the depressions 30U are provided on both surfaces (upper surface and lower surface) of the laminated portion 30, and the heat conductors 41 are embedded in the respective depressions 30U.
  • the secondary battery includes, for example, two heat conduction units 40 (two heat conductors 41).
  • the temperature of the stacked unit 30 is hardly increased excessively by using the heat conducting unit 40, so that the same effect can be obtained.
  • the penetration term 30K and the depression 30U may be used in combination.
  • FIG. 10 shows a perspective configuration of the secondary battery, and corresponds to FIG.
  • FIG. 11 shows a cross-sectional configuration of the secondary battery along the line AA shown in FIG. 10, and corresponds to FIG.
  • the secondary battery is the secondary battery according to the first embodiment except that the heat conducting unit 40 includes a heat conducting path 42 instead of the heat conducting body 41. (See FIGS. 1 to 3).
  • the through hole 30K extending in the stacking direction is provided in the stacked portion 30, but the heat conductor 41 is not embedded in the through hole 30K.
  • the exterior member 10 is provided with a through-hole 10K in a region corresponding to the through-hole 30K, for example.
  • this through-hole 30K functions as a flow path for air flowing through the stacked portion 30, it functions as a heat conduction path 42 that conducts heat generated in the stacked portion 30 in the stacking direction.
  • the heat conducting unit 40 includes a heat conducting path 42 extending in the stacking direction.
  • a part of the exterior member 10 is provided, for example, along the inner wall surface 30M of the stacked portion 30 inside the through-hole 30K. That is, the inner wall surface 30 ⁇ / b> M of the laminated portion 30 is covered with a part of the exterior member 10 without being exposed, for example.
  • heat conducting section 40 Details regarding the number, position, three-dimensional shape, and dimensions of the heat conducting section 40 (heat conducting path 42) are, for example, details regarding the number, position, three-dimensional shape, and dimensions of the heat conducting section 40 (thermal conductor 41). It is the same.
  • the charge / discharge reaction proceeds in the stacked unit 30 as in the secondary battery of the first embodiment. That is, lithium ions are occluded and released in each of the positive electrode 31 and the negative electrode 32.
  • the heat generated in the stacked unit 30 according to the progress of the charge / discharge reaction is conducted from the stacked unit 30 to the heat conducting unit 40 (heat conducting path 42), and then further inside the heat conducting path 42. Conducted in the extending direction (stacking direction). Since the temperature of the air flowing through the heat conduction path 42 (through hole 30K) is lower than the temperature of the heat generated in the stacked portion 30, the heat is diffused (heat radiation) in the heat conduction path 42.
  • the heat conductor 41 is not embedded in the through-hole 30K, and the inner wall surface 30M of the laminated portion 30 is covered with a part of the outer member 10 so as to cover the bag-shaped outer member 10. Except that the battery element 20 is encapsulated in the same manner as the secondary battery manufacturing method of the first embodiment.
  • the heat conduction that extends in the stacking direction and conducts heat in the stacking direction to the stacking portion 30 including the positive electrode 31 and the negative electrode 32 that are alternately stacked via the separator 33.
  • a portion 40 (heat conduction path 42) is provided.
  • the heat dissipation amount in the stacking direction is smaller than that in the case where the heat conducting unit 40 (heat conducting path 42) is not provided in the stacked unit 30.
  • the heat generated in the stacked unit 30 is conducted to the outside (the heat conduction path 42), and therefore the entire stacked unit 30 is easily radiated sufficiently. Thereby, since it becomes difficult to heat-store remarkably in the lamination
  • the through-hole 30K extending in the stacking direction is provided in the stacked unit 30 and the through-hole 30K functions as the heat conduction path 42, it occurs in the stacked unit 30 regardless of the position in the stacking direction. Since the generated heat is sufficiently dissipated in the heat conduction path 42, a higher effect can be obtained.
  • the number of the heat conducting portions 40 is one.
  • the number and positions of the heat conducting portions 40 are not particularly limited, and can be arbitrarily changed.
  • the number of the heat conducting portions 40 may be two or more.
  • the dimensions (for example, width and length) of the heat conduction path 42 may be changed as appropriate.
  • the number of the heat conducting portions 40 is four, and the four heat conducting portions 40 are arranged in the vicinity of the four corners in the plane of the stacked portion 30.
  • the four heat conduction paths 41 so that the volume of one heat conduction path 41 shown in FIG. 10 is equal to the total volume of the four heat conduction paths 42 shown in FIG. Each dimension (width and length) of the path 42 is adjusted.
  • the number of the heat conducting portions 40 is six, and the six heat conducting portions 40 are arranged so as to be arranged in a matrix of 2 rows ⁇ 3 columns.
  • the six heat conduction paths 42 shown in FIG. 10 and the six heat conduction paths 42 shown in FIG. 13 have the same volume so that the total volume is equal to each other. Each dimension (width and length) of the path 42 is adjusted.
  • the secondary battery includes, for example, one heat conducting unit 40 (heat conducting path 42).
  • the depressions 30 ⁇ / b> U are provided as heat conduction paths 42 by providing depressions 30 ⁇ / b> U on both surfaces (upper surface and lower surface) of the stacked unit 30.
  • a part of the exterior member 10 is provided, for example, along the inner wall surface 30M of the stacked portion 30 inside the recess 30U.
  • the secondary battery includes, for example, two heat conduction units 40 (heat conduction paths 42).
  • the temperature of the stacked unit 30 is hardly increased excessively by using the heat conducting unit 40, so that the same effect can be obtained.
  • the penetration term 30K and the depression 30U may be used in combination.
  • the stacked portion 30 is penetrated as shown in FIG. 10. It is preferable to provide a mouth 30K. This is because, as described above, the heat conduction path 42 is close to all the positive electrodes 31 and all the negative electrodes 32, so that the heat radiation amount becomes more uniform in the stacking direction.
  • the through hole 10 ⁇ / b> K is provided in the exterior member 10 in the region corresponding to the through hole 30 ⁇ / b> K.
  • the exterior member 10 may be provided with a non-through hole (recess 10 ⁇ / b> U) in a region corresponding to the through hole 30 ⁇ / b> K.
  • the laminated portion 30 is provided with a through-hole 30K, and a part of the exterior member 10 is along the inner wall surface 30M of the laminated portion 30 inside the through-hole 30K and a part of the through-hole 30K. It is provided so that it may block. That is, the through hole 30 ⁇ / b> K is closed by a part (part 10 ⁇ / b> P) of the exterior member 10.
  • the heat conducting unit 40 is substantially composed of a part of the heat conducting path 42 extending in the stacking direction.
  • the “part of the heat conduction path 42” is a part of the heat conduction path 42 that is not blocked by the portion 10P.
  • heat is radiated using the air flowing through the heat conduction path 42 by using the through hole 30 ⁇ / b> K provided in the laminated portion 30 as the heat conduction path 42.
  • the refrigerant may be used to dissipate heat.
  • the refrigerant may be circulated.
  • the heat conducting unit 40 includes a heat conducting path 42 extending in the stacking direction and a refrigerant supplied to the heat conducting path 42.
  • a liquid such as water may be supplied to the heat conduction path 42 instead of the refrigerant. In this case, the same effect can be obtained.
  • a refrigerant or the like may be supplied to the heat conduction path (through hole 30K), and in the case shown in FIG. A refrigerant or the like may be supplied to the conduction path 42 (the depression 30U). In these cases, similar effects can be obtained.
  • FIG. 18 shows a perspective configuration of the secondary battery, and corresponds to FIG.
  • FIG. 19 shows a cross-sectional configuration of the secondary battery along the line AA shown in FIG. 18, and corresponds to FIG.
  • this secondary battery is the first embodiment except that the heat conduction part 40 is composed of a heat conduction path 43 and a heat conductor 44 instead of the heat conductor 41.
  • This has the same configuration as that of the secondary battery (see FIGS. 1 and 2).
  • the depressions 10U are provided on both surfaces of the exterior member 10, and in the region corresponding to each depression 10U, one of the positive electrode 31 and the negative electrode 32 is entirely removed and the other Has been partially removed.
  • the positive electrode 31 is entirely removed. That is, each of the positive electrode current collector 31 ⁇ / b> A and the positive electrode active material layer 31 ⁇ / b> B is removed in a region corresponding to the depression 10 ⁇ / b> U in the stacked unit 30.
  • the negative electrode 32 is partially removed. Specifically, in a region other than the region corresponding to the depression 10U, for example, the negative electrode active material layer 32B is provided on both surfaces of the negative electrode current collector 32A, whereas in the region corresponding to the depression 10U, for example, The negative electrode active material layer 32B is not provided on both surfaces of the negative electrode current collector 32A. That is, in the negative electrode 32, for example, the negative electrode active material layer 32B is provided only on a part of the negative electrode current collector 32A.
  • the negative electrode current collector 32A is located in a region other than the region corresponding to the recess 10U, and the first negative electrode current collector portion 32AX provided with the negative electrode active material layer 32B, and the region corresponding to the recess 10U. And a second negative electrode current collecting portion 32AY that is not provided with the negative electrode active material layer 32B. Since the first negative electrode current collector portion 32AX and the second negative electrode current collector portion 32AY are connected to each other, they are electrically connected to each other.
  • the positive electrode current collector 31A, the positive electrode active material layer 31B, and the negative electrode active material layer 32B do not exist in the region corresponding to the depression 10U, and the negative electrode current collector 32A (second negative electrode current collector) A portion 32AY) exists.
  • the stacked unit 30 includes a plurality of first negative electrode current collector portions 32AX and a plurality of second negative electrode current collector portions 32AY
  • the plurality of second negative electrode current collector portions 32AY are stacked on each other, for example. . That is, the plurality of first negative electrode current collecting portions 32AX located in a region other than the region corresponding to the recess 10U are positioned in a region corresponding to the recess 10U, for example, while being separated from each other.
  • the multiple second negative electrode current collector portions 32AY are adjacent to each other, for example.
  • the hollow 30U is provided in the lamination
  • the second negative electrode current collector portion 32AY of the negative electrode current collector 32A is disposed in a region corresponding to the above-described heat conduction path 43, the heat conducted to the negative electrode current collector 32A is thermally conducted. It functions as a heat radiator 44 that is discharged to the path 43.
  • the heat conducting unit 40 includes the heat conducting path 43 extending in the stacking direction and the heat emitting body 44 disposed in a region corresponding to the heat conducting path 43.
  • a part of the exterior member 10 is provided, for example, along the surface of the second negative electrode current collecting portion 32AY disposed on the outermost side inside the recess 10U. That is, the second negative electrode current collecting portion 32AY is covered with a part of the exterior member 10 without being exposed, for example.
  • the heat conducting unit 40 (the heat conducting path 43 and the heat emitting body 44) are, for example, the number, position, three-dimensional shape of the heat conducting unit 40 (thermal conductor 41). Further, details regarding dimensions and the like are the same.
  • the heat is conducted from the stacked unit 30 to the heat conducting unit 40 (the heat conduction path 43 and the heat emitting body 44).
  • the heat conducting unit 40 heat is conducted to the heat emitting body 44, and then the heat is released from the heat emitting body 44 to the heat conducting path 43.
  • the temperature of the air flowing through the heat conduction path 43 is lower than the temperature of the heat generated in the laminated portion 30, so that the heat is diffused (heat radiation) by being released from the heat emitter 44 to the heat conduction path 43.
  • the secondary battery manufacturing method includes, for example, a positive electrode 31 in which each of the positive electrode current collector 31A and the positive electrode active material layer 32B is partially deleted, and a negative electrode current collector 32A in the first negative electrode current collector portion 32AX and the first negative electrode current collector portion 32AX.
  • the battery element 20 is formed inside the bag-like exterior member 10 so that the surface of the second negative electrode current collection portion 32AY is covered with a part of the exterior member 10 while forming the negative electrode 32 including the two negative electrode current collection portions 32AY.
  • the secondary battery manufacturing method of the first embodiment is the same as that of the first embodiment except that is enclosed.
  • the heat conduction that extends in the stacking direction and conducts heat in the stacking direction to the stacking portion 30 including the positive electrode 31 and the negative electrode 32 that are alternately stacked via the separator 33.
  • the part 40 (the heat conduction path 43 and the heat radiator 44) is provided.
  • the laminated portion 30 is laminated as compared with the case where the heat conducting portion 40 (the heat conduction path 43 and the heat radiator 44) is not provided.
  • the amount of heat radiation becomes substantially uniform in the direction, and the heat generated in the stacked portion 30 is conducted to the outside (the heat conduction path 43 and the heat-dissipating body 44), so that the entire stacked portion 30 is easily radiated sufficiently.
  • stacking part 30 becomes difficult to rise too much as a whole. Therefore, the safety of the secondary battery can be improved.
  • the stacked unit 30 includes a plurality of second negative electrode current collector portions 32AY and the plurality of second negative electrode current collector portions 32AY are stacked on each other, the plurality of second negative electrode current collector portions 32AY are mutually connected.
  • the volume of the recess 30U increases, so the volume of the heat conduction path 43 also increases.
  • the flow rate of air inside the heat conduction path 43 the depression 30U
  • the heat generated in the stacked portion 30 is more easily radiated in the heat conduction path 43. Therefore, a higher effect can be obtained.
  • a part of the exterior member 10 is provided along the surface of the second negative electrode current collector portion 32AY inside the recess 10U, a part of the outer member 10 is a surface of the second negative electrode current collector portion 32AY.
  • the air flow path heat conduction path 43
  • the air flow path having a temperature lower than that of the stacked portion 30 during heat generation approaches the heat emitting body 44. Therefore, since heat is easily released from the heat emitting body 44 to the heat conduction path 43, a higher effect can be obtained.
  • the number of the heat conducting portions 40 (the heat conducting paths 43 and the heat emitting bodies 44) is one.
  • the number and positions of the heat conducting portions 40 are not particularly limited, and can be arbitrarily changed. The same effect can be obtained even when the number and positions of the heat conducting sections 40 (the heat conducting paths 43 and the heat emitting bodies 44) are changed as described above.
  • the plurality of second negative electrode current collecting portions 32AY are stacked on each other. However, as shown in FIG. 20 corresponding to FIG. 19, the plurality of second negative electrode current collecting portions 32AY may be separated from each other without being stacked on each other. In this case, the outer member 10 may not be provided with the recess 10U. Also in this case, since the temperature of the laminated part 30 becomes difficult to rise excessively as a whole using the heat conducting part 40, the same effect can be obtained.
  • a plurality of second negative electrodes can be used to further suppress the excessive rise in the temperature of the stacked unit 30 by sufficiently dissipating the heat generated in the stacked unit 30.
  • the current collecting portions 32AY are preferably stacked on each other. As described above, since the air flow path (heat conduction path 43) approaches the plurality of second negative electrode current collection portions 32 ⁇ / b> AY, heat is transferred from the second negative electrode current collection portion 32 ⁇ / b> AY, which is the heat emitter 44, to the heat conduction path 43. It is because it becomes easy to be released.
  • the positive electrode current collector 31A includes the first positive electrode current collector portion 31AX and the second positive electrode current collector portion 31AY.
  • the second positive current collecting portion 31AY may be used.
  • the negative electrode 32 is entirely removed. That is, each of the negative electrode current collector 32 ⁇ / b> A and the negative electrode active material layer 32 ⁇ / b> B is removed in a region corresponding to the depression 10 ⁇ / b> U in the stacked unit 30.
  • the positive electrode 31 is partially removed. Specifically, in regions other than the region corresponding to the depression 10U, for example, the positive electrode active material layer 31B is provided on both surfaces of the positive electrode current collector 31A, whereas in the region corresponding to the depression 10U, for example, The positive electrode active material layer 31B is not provided on both surfaces of the positive electrode current collector 31A. That is, in the positive electrode 31, for example, the positive electrode active material layer 31B is provided only on a part of the positive electrode current collector 31A.
  • the positive electrode current collector 31A is located in a region other than the region corresponding to the depression 10U, and the first positive electrode current collector portion 31AX provided with the positive electrode active material layer 31B, and the region corresponding to the depression 10U. And a second positive electrode current collecting portion 31AY that is not provided with the positive electrode active material layer 31B. Since the first positive electrode current collecting portion 31AX and the second positive electrode current collecting portion 31AY are connected to each other, they are electrically connected to each other.
  • the positive electrode active material layer 31B (second positive electrode current collector) is not present in the region corresponding to the depression 10U, for example, without the positive electrode active material layer 31B, the negative electrode current collector 32A, and the negative electrode active material layer 32B.
  • the stacked unit 30 includes a plurality of first negative electrode current collector portions 32AX and a plurality of second negative electrode current collector portions 32AY
  • the plurality of second positive electrode current collector portions 31AY are stacked on each other, for example. . That is, the plurality of first positive electrode current collector portions 31AX located in a region other than the region corresponding to the recess 10U are positioned in a region corresponding to the recess 10U, for example, while being separated from each other.
  • the plurality of second positive electrode current collector portions 31AY are adjacent to each other, for example.
  • the hollow 30U is provided in the lamination
  • the recess 30U functions as the heat conduction path 43 that conducts the heat generated in the stacked unit 30 in the stacking direction.
  • the second positive electrode current collecting portion 31AY of the positive electrode current collector 31A is disposed in the region corresponding to the above-described heat conduction path 43, the heat conducted to the positive electrode current collector 31A is thermally conducted. It functions as a heat radiator 44 that is discharged to the path 43.
  • the heat conducting unit 40 includes the heat conducting path 43 extending in the stacking direction and the heat emitting body 44 disposed in a region corresponding to the heat conducting path 43.
  • a part of the exterior member 10 is provided, for example, along the surface of the second positive electrode current collecting portion 31AY disposed on the outermost side in the recess 10U. That is, the second positive electrode current collecting portion 31 ⁇ / b> AY is covered with a part of the exterior member 10 without being exposed, for example.
  • the temperature of the stacked portion 30 is hardly increased excessively by using the heat conducting portion 40. Can be obtained.
  • the positive and negative electrode current collector 32A includes the first positive electrode current collector portion 31AX and the second positive electrode current collector portion 31AY, and the negative electrode current collector 32A includes the first negative electrode current collector. Since the portion 32AX and the second negative electrode current collecting portion 32AY are included, the heat-dissipating body 44 may be composed of the second positive electrode current collecting portion 31AY and the second negative electrode current collecting portion 32AY. In this case, the same effect can be obtained.
  • the stacked unit 30 includes a plurality of first positive electrode current collector portions 31AY and a plurality of second negative electrode current collector portions 32AY, a plurality of first positive electrode current collector portions 31AY and It is preferable that the plurality of second negative electrode current collecting portions 32AY are not stacked on each other. Or in order to prevent a short circuit, you may interpose an insulating layer between 1st positive electrode current collection part 31AY and 2nd negative electrode current collection part 32AY which adjoin mutually.
  • the plurality of first positive electrode current collector portions 31AY and the plurality of second negative electrode current collector portions may be stacked on each other.
  • the kind of insulating layer is not specifically limited, For example, it is the separator 33 etc.
  • the thermal conductor 41 is only applied to a part of the through-hole 30 ⁇ / b> K provided in the stacked unit 30. It may be buried. In this case, a portion of the through hole 30K where the heat conductor 41 is not embedded functions as an air flow path (heat conduction path 42).
  • the heat conducting unit 40 includes, for example, a heat conductor 41 and a heat conduction path 42.
  • the heat conduction unit 40 includes, for example, a heat conductor 41, a heat conduction path 43, and a heat radiator 44.
  • the depression 30U is provided in the lamination portion 30 and the lamination A plurality of second negative electrode current collecting portions AX may be stacked on each other in a region corresponding to the other depression 30U provided in the portion 30.
  • one depression 30U functions as an air flow path (heat conduction path 42), and the other depression 30U also functions as an air flow path (heat conduction path 43).
  • the plurality of second negative electrode current collector portions 32 ⁇ / b> AY function as the heat emitter 44.
  • the heat conducting unit 40 includes the heat conducting paths 42 and 43 and the heat emitting body 44.
  • Secondary batteries include machines, equipment, instruments, devices, and systems (aggregates of multiple equipment) that can use the secondary battery as a power source for driving and a power storage source for storing power.
  • the secondary battery used as a power source may be a main power source or an auxiliary power source.
  • the main power source is a power source that is preferentially used regardless of the presence or absence of other power sources.
  • the auxiliary power supply may be, for example, a power supply used instead of the main power supply, or a power supply that can be switched from the main power supply as necessary.
  • the type of main power source is not limited to the secondary battery.
  • the usage of the secondary battery is, for example, as follows.
  • Electronic devices including portable electronic devices
  • portable electronic devices such as video cameras, digital still cameras, mobile phones, notebook computers, cordless phones, headphone stereos, portable radios, portable televisions, and portable information terminals.
  • It is a portable living device such as an electric shaver.
  • Storage devices such as backup power supplies and memory cards.
  • Electric tools such as electric drills and electric saws.
  • It is a battery pack that is mounted on a notebook computer or the like as a detachable power source.
  • Medical electronic devices such as pacemakers and hearing aids.
  • An electric vehicle such as an electric vehicle (including a hybrid vehicle).
  • It is an electric power storage system such as a home battery system that stores electric power in case of an emergency.
  • the secondary battery may be used other than the above.
  • the battery pack is a power source using a secondary battery. As will be described later, this battery pack may use a single battery or an assembled battery.
  • An electric vehicle is a vehicle that operates (runs) using a secondary battery as a driving power source, and may be an automobile (such as a hybrid automobile) that includes a drive source other than the secondary battery as described above.
  • the power storage system is a system that uses a secondary battery as a power storage source.
  • a secondary battery which is a power storage source
  • An electric power tool is a tool in which a movable part (for example, a drill etc.) moves using a secondary battery as a power source for driving.
  • An electronic device is a device that exhibits various functions using a secondary battery as a driving power source (power supply source).
  • FIG. 22 shows a perspective configuration of a battery pack using single cells
  • FIG. 23 shows a block configuration of the battery pack shown in FIG. FIG. 22 shows a state where the battery pack is disassembled.
  • the battery pack described here is a simple battery pack (so-called soft pack) using one secondary battery, and is mounted on, for example, an electronic device typified by a smartphone.
  • the battery pack includes a power supply 111 that is a laminate film type secondary battery, and a circuit board 116 that is connected to the power supply 111.
  • a positive electrode lead 112 and a negative electrode lead 113 are attached to the power source 111.
  • a pair of adhesive tapes 118 and 119 are attached to both side surfaces of the power source 111.
  • a protection circuit (PCM: Protection Circuit Circuit Module) is formed on the circuit board 116.
  • the circuit board 116 is connected to the positive electrode 112 through the tab 114 and is connected to the negative electrode lead 113 through the tab 115.
  • the circuit board 116 is connected to a lead wire 117 with a connector for external connection. In the state where the circuit board 116 is connected to the power source 111, the circuit board 116 is protected by the label 120 and the insulating sheet 121. By attaching the label 120, the circuit board 116, the insulating sheet 121, and the like are fixed.
  • the battery pack includes, for example, a power supply 111 and a circuit board 116 as shown in FIG.
  • the circuit board 116 includes, for example, a control unit 121, a switch unit 122, a thermal resistance element (PTC element) 123, and a temperature detection unit 124. Since the power source 111 can be connected to the outside via the positive electrode terminal 125 and the negative electrode terminal 127, the power source 111 can be charged / discharged via the positive electrode terminal 125 and the negative electrode terminal 127.
  • the temperature detector 124 detects the temperature using a temperature detection terminal (so-called T terminal) 126.
  • the controller 121 controls the operation of the entire battery pack (including the usage state of the power supply 111).
  • the control unit 121 includes, for example, a central processing unit (CPU) and a memory.
  • the control unit 121 disconnects the switch unit 122 so that the charging current does not flow in the current path of the power supply 111. Further, for example, when a large current flows during charging, the control unit 121 cuts off the charging unit by cutting the switch unit 122.
  • the control unit 121 disconnects the switch unit 122 so that the discharge current does not flow in the current path of the power supply 111. For example, when a large current flows during discharge, the control unit 121 cuts off the discharge current by cutting the switch unit 122.
  • the overcharge detection voltage is not particularly limited, but is, for example, 4.2 V ⁇ 0.05 V.
  • the overdischarge detection voltage is not particularly limited, but is, for example, 2.4V ⁇ 0.1V.
  • the switch unit 122 switches the usage state of the power source 111, that is, whether or not the power source 111 is connected to an external device, in accordance with an instruction from the control unit 121.
  • the switch unit 122 includes, for example, a charge control switch and a discharge control switch.
  • Each of the charge control switch and the discharge control switch is, for example, a semiconductor switch such as a field effect transistor (MOSFET) using a metal oxide semiconductor.
  • MOSFET field effect transistor
  • the temperature detection unit 124 measures the temperature of the power supply 111 and outputs the temperature measurement result to the control unit 121.
  • the temperature detection unit 124 includes a temperature detection element such as a thermistor, for example.
  • the temperature measurement result measured by the temperature detection unit 124 is used when the control unit 121 performs charge / discharge control during abnormal heat generation, or when the control unit 121 performs correction processing when calculating the remaining capacity. .
  • circuit board 116 may not include the PTC element 123. In this case, a PTC element may be attached to the circuit board 116 separately.
  • FIG. 24 shows a block configuration of a battery pack using an assembled battery.
  • This battery pack includes, for example, a control unit 61, a power source 62, a switch unit 63, a current measurement unit 64, a temperature detection unit 65, a voltage detection unit 66, and a switch control unit 67 inside the housing 60.
  • the housing 60 includes, for example, a plastic material.
  • the control unit 61 controls the operation of the entire battery pack (including the usage state of the power supply 62).
  • the control unit 61 includes, for example, a CPU.
  • the power source 62 is an assembled battery including two or more secondary batteries, and the connection form of the two or more secondary batteries may be in series, in parallel, or a mixture of both.
  • the power source 62 includes six secondary batteries connected in two parallel three series.
  • the switch unit 63 switches the usage state of the power source 62, that is, whether or not the power source 62 is connected to an external device, in accordance with an instruction from the control unit 61.
  • the switch unit 63 includes, for example, a charge control switch, a discharge control switch, a charging diode, a discharging diode, and the like.
  • Each of the charge control switch and the discharge control switch is, for example, a semiconductor switch such as a field effect transistor (MOSFET) using a metal oxide semiconductor.
  • MOSFET field effect transistor
  • the current measurement unit 64 measures the current using the current detection resistor 70 and outputs the measurement result of the current to the control unit 61.
  • the temperature detection unit 65 measures the temperature using the temperature detection element 69 and outputs the temperature measurement result to the control unit 61. This temperature measurement result is used, for example, when the control unit 61 performs charge / discharge control during abnormal heat generation, or when the control unit 61 performs correction processing when calculating the remaining capacity.
  • the voltage detection unit 66 measures the voltage of the secondary battery in the power source 62 and supplies the control unit 61 with the measurement result of the analog-digital converted voltage.
  • the switch control unit 67 controls the operation of the switch unit 63 according to signals input from the current measurement unit 64 and the voltage detection unit 66, respectively.
  • the switch control unit 67 disconnects the switch unit 63 (charge control switch) so that the charging current does not flow in the current path of the power source 62.
  • the power source 62 can only discharge through the discharging diode.
  • the switch control unit 67 cuts off the charging current.
  • the switch control unit 67 disconnects the switch unit 63 (discharge control switch) so that the discharge current does not flow in the current path of the power source 62.
  • the power source 62 can only be charged via the charging diode.
  • the switch control unit 67 interrupts the discharge current.
  • the overcharge detection voltage is not particularly limited, but is, for example, 4.2 V ⁇ 0.05 V.
  • the overdischarge detection voltage is not particularly limited, but is, for example, 2.4V ⁇ 0.1V.
  • the memory 68 includes, for example, an EEPROM which is a nonvolatile memory.
  • the memory 68 stores, for example, numerical values calculated by the control unit 61 and information (for example, internal resistance in the initial state) of the secondary battery measured in the manufacturing process stage. If the full charge capacity of the secondary battery is stored in the memory 68, the control unit 61 can grasp information such as the remaining capacity.
  • the temperature detection element 69 measures the temperature of the power supply 62 and outputs the temperature measurement result to the control unit 61.
  • the temperature detection element 69 includes, for example, a thermistor.
  • Each of the positive electrode terminal 71 and the negative electrode terminal 72 includes an external device (eg, a notebook personal computer) that is operated using a battery pack, an external device (eg, a charger) that is used to charge the battery pack, and the like. It is a terminal connected to.
  • the power source 62 can be charged / discharged via the positive terminal 71 and the negative terminal 72.
  • FIG. 25 illustrates a block configuration of a hybrid vehicle that is an example of an electric vehicle.
  • This electric vehicle includes, for example, a control unit 74, an engine 75, a power source 76, a driving motor 77, a differential device 78, a generator 79, and a transmission 80 inside a metal casing 73. And a clutch 81, inverters 82 and 83, and various sensors 84.
  • the electric vehicle includes, for example, a front wheel drive shaft 85 and a front wheel 86 connected to the differential device 78 and the transmission 80, and a rear wheel drive shaft 87 and a rear wheel 88.
  • This electric vehicle can travel using, for example, one of the engine 75 and the motor 77 as a drive source.
  • the engine 75 is a main power source, such as a gasoline engine.
  • the driving force (rotational force) of the engine 75 is transmitted to the front wheels 86 and the rear wheels 88 via the differential device 78, the transmission 80, and the clutch 81 which are driving units.
  • the motor 77 serving as the conversion unit is used as a power source
  • the power (DC power) supplied from the power source 76 is converted into AC power via the inverter 82, and therefore the motor is utilized using the AC power.
  • 77 is driven.
  • the driving force (rotational force) converted from the electric power by the motor 77 is transmitted to the front wheels 86 and the rear wheels 88 via, for example, a differential device 78 that is a driving unit, a transmission 80, and a clutch 81.
  • the motor 77 may generate AC power using the rotational force. Good. Since this AC power is converted into DC power via the inverter 82, it is preferable that the DC regenerative power can be stored in the power source 76.
  • the control unit 74 controls the operation of the entire electric vehicle.
  • the control unit 74 includes, for example, a CPU.
  • the power source 76 includes one or more secondary batteries.
  • the power source 76 may be connected to an external power source, and may store power by receiving power supply from the external power source.
  • the various sensors 84 are used, for example, to control the rotational speed of the engine 75 and to control the throttle valve opening (throttle opening).
  • the various sensors 84 include, for example, any one or more of speed sensors, acceleration sensors, engine speed sensors, and the like.
  • the electric vehicle may be a vehicle (electric vehicle) that operates using only the power source 76 and the motor 77 without using the engine 75.
  • FIG. 26 shows a block configuration of the power storage system.
  • This power storage system includes, for example, a control unit 90, a power source 91, a smart meter 92, and a power hub 93 in a house 89 such as a general house or a commercial building.
  • the power source 91 is connected to, for example, an electric device 94 installed inside the house 89 and can be connected to an electric vehicle 96 stopped outside the house 89.
  • the power source 91 is connected to, for example, a private generator 95 installed in a house 89 via a power hub 93 and can be connected to an external centralized power system 97 via a smart meter 92 and the power hub 93. is there.
  • the electric device 94 includes, for example, one or more home appliances, and the home appliances are, for example, a refrigerator, an air conditioner, a television, and a water heater.
  • the private power generator 95 includes, for example, any one type or two or more types among a solar power generator and a wind power generator.
  • the electric vehicle 96 includes, for example, any one or more of an electric vehicle, an electric motorcycle, and a hybrid vehicle.
  • the centralized power system 97 includes, for example, any one or more of a thermal power plant, a nuclear power plant, a hydroelectric power plant, and a wind power plant.
  • the control unit 90 controls the operation of the entire power storage system (including the usage state of the power supply 91).
  • the control unit 90 includes, for example, a CPU.
  • the power source 91 includes one or two or more secondary batteries.
  • the smart meter 92 is, for example, a network-compatible power meter installed in the house 89 on the power demand side, and can communicate with the power supply side. Accordingly, the smart meter 92 enables highly efficient and stable energy supply, for example, by controlling the balance between the demand and supply of power in the house 89 while communicating with the outside.
  • the power storage system for example, power is accumulated in the power source 91 from the centralized power system 97 that is an external power source via the smart meter 92 and the power hub 93, and from the private power generator 95 that is an independent power source via the power hub 93.
  • electric power is accumulated in the power source 91.
  • the electric power stored in the power supply 91 is supplied to the electric device 94 and the electric vehicle 96 in accordance with an instruction from the control unit 90, so that the electric device 94 can be operated and the electric vehicle 96 can be charged.
  • the power storage system is a system that makes it possible to store and supply power in the house 89 using the power source 91.
  • the power stored in the power source 91 can be used as necessary. For this reason, for example, power is stored in the power source 91 from the centralized power system 97 at midnight when the electricity usage fee is low, and the power stored in the power source 91 is used during the day when the electricity usage fee is high. it can.
  • the power storage system described above may be installed for each house (one household), or may be installed for each of a plurality of houses (multiple households).
  • FIG. 27 shows a block configuration of the electric power tool.
  • the electric tool described here is, for example, an electric drill.
  • This electric tool includes, for example, a control unit 99 and a power source 100 inside a tool body 98.
  • a drill portion 101 which is a movable portion is attached to the tool body 98 so as to be operable (rotatable).
  • the tool main body 98 includes, for example, a plastic material.
  • the control unit 99 controls the operation of the entire power tool (including the usage state of the power supply 100).
  • the control unit 99 includes, for example, a CPU.
  • the power supply 100 includes one or more secondary batteries.
  • the control unit 99 supplies power from the power supply 100 to the drill unit 101 in accordance with the operation of the operation switch.
  • the secondary battery four types of secondary batteries (FIG. 2 and FIGS. 4 to 6) were used. That is, one or four heat conductors 41 extending in the stacking direction are used as the heat conducting unit 40, and one or five heat conducting layers extending in the in-plane direction are used as the heat conducting unit 70. 71 was used. The position of one heat conductor 41 is in the vicinity of the center in the plane of the stacked portion 30, and the positions of the four heat conductors 41 are in the vicinity of the four corners in the plane of the stacked portion 30.
  • the material for forming the heat conductor 41 and the heat conductive layer 71 was copper having a thermal conductivity of 420 W / m ⁇ K.
  • the environmental condition (temperature) was 24 ° C.
  • Each of the heat transfer coefficient on the surface of the secondary battery (laminated part 30) and the heat transfer coefficient on the surface of the heat conductor 41 was 10 W / m 2 ⁇ K.
  • the dimensions of the heat conductor 41 and the heat conductive layer 71 were set so that the occupation ratio was 1%.
  • the results shown in Table 1 were obtained.
  • the temperature of the secondary battery elapsed temperature: ° C
  • the heat generation condition (heat generation rate) of the secondary battery was 380000 W / m 3 .
  • the difference in the rate of decrease in the elapsed temperature as described above is caused by the difference in the configuration of the heat conducting portion 40 (the heat conductor 41 and the heat conducting layer). 71). That is, when the heat conductive layer 71 extending in the in-plane direction is used, since the heat generated in the stacked portion 30 is not sufficiently dissipated using the heat conductive layer 71, the rate of decrease in elapsed temperature is small. . On the other hand, when the heat conductive layer 41 extending in the stacking direction is used, since the heat generated in the stacked portion 30 is sufficiently dissipated using the heat conductor 41, the rate of decrease in elapsed temperature. Becomes significantly larger.
  • the heat conducting unit 40 includes the heat conducting path 42 extending in the stacking direction (second embodiment)
  • the heat conducting unit 40 extends in the stacking direction.
  • the same advantageous tendency as that in the case of the heat conduction portion 40 made of the heat conductor 41 (first embodiment) is obtained. It is thought that it is obtained.
  • a lithium ion secondary battery capable of obtaining the capacity of the negative electrode by using the lithium absorption phenomenon and the lithium release phenomenon is taken as an example, it is not limited thereto.
  • the secondary battery of the present technology may be, for example, a lithium metal secondary battery in which the capacity of the negative electrode can be obtained by utilizing a lithium precipitation phenomenon and a lithium dissolution phenomenon.
  • the secondary battery of the present technology for example, by setting the capacity of the negative electrode active material capable of occluding and releasing lithium to be smaller than the capacity of the positive electrode, the lithium storage phenomenon and lithium release A secondary battery in which the capacity of the negative electrode is obtained based on the sum of the capacity resulting from the phenomenon and the capacity resulting from the lithium precipitation phenomenon and the lithium dissolution phenomenon may be used.
  • the electrode reactant used in the secondary battery of the present technology may be, for example, any other group 1 element in the long-period periodic table such as sodium and potassium, or the group 2 element in the long-period periodic table such as magnesium and calcium. It may be an element or another light metal such as aluminum.
  • the electrode reactant may be an alloy containing any one or more of the series of elements described above.
  • the laminated portion is provided with at least one of a through-hole and a depression extending in the laminating direction, The heat conduction part is a heat conductor embedded in at least one of the through hole and the depression.
  • the thermal conductivity of the thermal conductor in the stacking direction is higher than the thermal conductivity of the stacked portion in the stacking direction.
  • the heat conductor includes at least one of a metal material, a polymer material, and a gel material.
  • the laminated portion is provided with at least one of a through-hole and a depression extending in the laminating direction,
  • the heat conduction part is a heat conduction path including at least one of the through hole and the depression.
  • a storage member for storing the laminated portion is provided, A part of the storage member is provided along the inner wall surface of the stacked portion in at least one of the through-hole and the recess.
  • the heat conduction part is the heat conduction path including the through hole, A part of the storage member is provided so as to be along the inner wall surface of the laminate in the through hole and to close a part of the through hole.
  • the secondary battery as described in said (6).
  • the heat conducting part is a refrigerant further supplied to at least one of the through hole and the depression.
  • the secondary battery according to any one of (5) to (7).
  • the negative electrode includes a negative electrode current collector and a negative electrode active material layer provided on a part of the negative electrode current collector,
  • the negative electrode current collector includes a first negative electrode current collector portion provided with the negative electrode active material layer, and a second negative electrode connected to the first negative electrode current collector portion and not provided with the negative electrode active material layer.
  • the lamination portion is provided with a recess extending in the lamination direction
  • the heat conduction part is a heat conduction path composed of the depressions and the second negative electrode current collecting part disposed in a region corresponding to the depressions.
  • the stacked portion includes a plurality of the second negative electrode current collecting portions, The plurality of second negative electrode current collecting portions are stacked on each other.
  • a storage member for storing the laminated portion is provided, A part of the storage member is provided so as to be along the surface of the second negative electrode current collecting portion inside the depression.
  • a lithium ion secondary battery The secondary battery according to any one of (1) to (11) above.
  • a battery pack comprising: a switch unit that switches the operation of the secondary battery in accordance with an instruction from the control unit.
  • a conversion unit that converts electric power supplied from the secondary battery into driving force;
  • a drive unit that is driven according to the drive force;
  • An electric vehicle comprising: a control unit that controls the operation of the secondary battery.
  • An electronic device comprising the secondary battery according to any one of (1) to (12) as a power supply source.

Abstract

L'invention concerne une batterie secondaire comprenant : une section d'empilement qui comprend des électrodes positives et des électrodes négatives qui sont empilées de façon alternée par l'intermédiaire de séparateurs; et une section de conduction de chaleur qui est disposée dans la section d'empilement de façon à s'étendre dans une direction d'empilement des électrodes positives et des électrodes négatives, et qui conduit, dans la direction d'empilement, la chaleur générée dans la section d'empilement.
PCT/JP2018/015957 2017-04-24 2018-04-18 Batterie secondaire, bloc-batterie, véhicule électrique, système de stockage d'électricité, outil électrique, et appareil électronique WO2018198895A1 (fr)

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