WO2021153291A1 - 非水電解質二次電池及び二次電池モジュール - Google Patents

非水電解質二次電池及び二次電池モジュール Download PDF

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Publication number
WO2021153291A1
WO2021153291A1 PCT/JP2021/001387 JP2021001387W WO2021153291A1 WO 2021153291 A1 WO2021153291 A1 WO 2021153291A1 JP 2021001387 W JP2021001387 W JP 2021001387W WO 2021153291 A1 WO2021153291 A1 WO 2021153291A1
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WIPO (PCT)
Prior art keywords
positive electrode
secondary battery
current collector
electrolyte secondary
aqueous electrolyte
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/001387
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English (en)
French (fr)
Japanese (ja)
Inventor
太久哉 浅利
島村　治成
康平 続木
柳田　勝功
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Panasonic Corp
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Panasonic Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Corp filed Critical Panasonic Corp
Priority to JP2021574637A priority Critical patent/JP7645202B2/ja
Priority to CN202510207679.XA priority patent/CN120149688A/zh
Priority to CN202180010923.3A priority patent/CN115023851A/zh
Priority to US17/795,350 priority patent/US20230104739A1/en
Publication of WO2021153291A1 publication Critical patent/WO2021153291A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
    • 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
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M10/60—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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • H01M4/662—Alloys
    • 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
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
    • 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/028—Positive electrodes
    • 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

  • This disclosure relates to the technology of a non-aqueous electrolyte secondary battery and a secondary battery module.
  • a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery typically has an electrode body in which a positive electrode having a positive electrode active material layer and a negative electrode having a negative electrode active material layer are laminated via a separator. It is provided with an electrolytic solution.
  • a non-aqueous electrolyte secondary battery is, for example, a battery in which a charge carrier (for example, lithium ion) in an electrolytic solution moves back and forth between both electrodes to charge and discharge.
  • a charge carrier for example, lithium ion
  • the charge carrier is released from the negative electrode active material, and the charge carrier is occluded into the positive electrode active material.
  • the electrode body expands and contracts.
  • the nail piercing test is, for example, a test in which a nail is pierced into a battery to generate an internal short circuit in a simulated manner, and the degree of heat generation is examined to confirm the safety of the battery.
  • Patent Document 1 describes a non-aqueous electrolytic solution secondary battery having a positive electrode that reversibly occludes lithium ions, wherein the positive electrode is a sheet-shaped current collector that supports an active material layer and the active material layer.
  • the current collector contains aluminum and at least one element other than aluminum, and is obtained by averaging the proportions of the elements constituting the current collector in the thickness direction of the current collector.
  • a non-aqueous electrolytic solution secondary battery whose average composition is equal to that of an alloy having a liquidus temperature of 630 ° C. or lower is disclosed.
  • the melting point of the positive electrode current collector is suppressed to a low level, and the time until the positive electrode current collector is melted during the nail piercing test is shortened, so that the heat generation of the battery in the nail piercing test is suppressed. ..
  • the secondary battery module is arranged together with at least one non-aqueous electrolyte secondary battery and the non-aqueous electrolyte secondary battery, and receives a load from the non-aqueous electrolyte secondary battery in the arrangement direction.
  • a secondary battery module having an elastic body wherein the non-aqueous electrolyte secondary battery includes an electrode body in which a positive electrode, a negative electrode, and a separator arranged between the positive electrode and the negative electrode are laminated, and the electrode body.
  • a housing for accommodating an electrode body is provided, and the compressive elasticity of the elastic body is 5 MPa to 120 MPa.
  • the positive electrode has a positive electrode current collector containing elements other than Al and Al, and the positive electrode current collector.
  • the thermal conductivity of the body is 65 W / (m ⁇ K) to 150 W / (m ⁇ K).
  • the non-aqueous electrolyte secondary battery includes an electrode body in which a positive electrode, a negative electrode, and a separator arranged between the positive electrode and the negative electrode are laminated, and the electrode body to the electrode body.
  • a non-aqueous electrolyte secondary battery comprising an elastic body that receives a load in the stacking direction of the above, an electrode body, and a housing that accommodates the elastic body, and the compressive elasticity of the elastic body is 5 MPa to 120 MPa.
  • the positive electrode has a positive electrode current collector containing elements other than Al and Al, and the thermal conductivity of the positive electrode current collector is 65 W / (m ⁇ K) to 150 W / (m ⁇ K).
  • FIG. 1 is a perspective view of the secondary battery module according to the embodiment.
  • FIG. 2 is an exploded perspective view of the secondary battery module according to the embodiment.
  • FIG. 3 is a cross-sectional view schematically showing how the non-aqueous electrolyte secondary battery expands.
  • FIG. 4 is a schematic cross-sectional view showing the state of the electrode body at the time of the nail piercing test.
  • FIG. 5 is a schematic cross-sectional view showing a state in which the elastic body is arranged in the housing.
  • FIG. 6 is a schematic perspective view of a cylindrically wound electrode body.
  • FIG. 7 is a schematic perspective view showing an example of an elastic body.
  • FIG. 8 is a partial schematic cross-sectional view of an elastic body sandwiched between the electrode body and the housing.
  • FIG. 1 is a perspective view of the secondary battery module according to the embodiment.
  • FIG. 2 is an exploded perspective view of the secondary battery module according to the embodiment.
  • the secondary battery module 1 includes a laminate 2, a pair of restraint members 6, and a cooling plate 8.
  • the laminate 2 has a plurality of non-aqueous electrolyte secondary batteries 10, a plurality of insulating spacers 12, a plurality of elastic bodies 40, and a pair of end plates 4.
  • Each non-aqueous electrolyte secondary battery 10 is a rechargeable secondary battery such as a lithium ion secondary battery.
  • the non-aqueous electrolyte secondary battery 10 of the present embodiment is a so-called square battery, and includes an electrode body 38 (see FIG. 3), an electrolytic solution, and a flat rectangular parallelepiped housing 13.
  • the housing 13 is composed of an outer can 14 and a sealing plate 16.
  • the outer can 14 has a substantially rectangular opening on one surface, and the electrode body 38, the electrolytic solution, and the like are housed in the outer can 14 through the opening. It is desirable that the outer can 14 is covered with an insulating film such as a shrink tube.
  • the opening of the outer can 14 is provided with a sealing plate 16 that closes the opening and seals the outer can 14.
  • the sealing plate 16 constitutes the first surface 13a of the housing 13.
  • the sealing plate 16 and the outer can 14 are joined by, for example, laser, friction stir welding, brazing, or the like.
  • the housing 13 may be, for example, a cylindrical case, or may be an exterior body made of a laminated sheet containing a metal layer and a resin layer.
  • the electrode body 38 has a structure in which a plurality of sheet-shaped positive electrodes 38a and a plurality of sheet-shaped negative electrodes 38b are alternately laminated via a separator 38d (see FIG. 3).
  • the positive electrode 38a, the negative electrode 38b, and the separator 38d are laminated along the first direction X. That is, the first direction X is the stacking direction of the electrode body 38.
  • the electrodes located at both ends in this stacking direction face the long side surfaces of the housing 13, which will be described later.
  • the first direction X, the second direction Y, and the third direction Z shown in the figure are directions orthogonal to each other.
  • the electrode body 38 is a cylindrical winding type electrode body in which a band-shaped positive electrode and a band-shaped negative electrode are laminated via a separator, and a flat winding type electrode body in which a cylindrical winding type electrode body is formed into a flat shape. It may be a type electrode body. In the case of a flat winding type electrode body, a rectangular parallelepiped outer can can be applied, but in the case of a cylindrical winding type electrode body, a cylindrical outer can is applied.
  • the sealing plate 16 that is, the first surface 13a of the housing 13, is provided with an output terminal 18 electrically connected to the positive electrode 38a of the electrode body 38 from one end in the longitudinal direction, and the electrode body 38 is provided from the other end.
  • An output terminal 18 electrically connected to the negative electrode 38b is provided.
  • the output terminal 18 connected to the positive electrode 38a will be referred to as a positive electrode terminal 18a
  • the output terminal 18 connected to the negative electrode 38b will be referred to as a negative electrode terminal 18b.
  • the positive electrode terminal 18a and the negative electrode terminal 18b are collectively referred to as an output terminal 18.
  • the outer can 14 has a bottom surface facing the sealing plate 16. Further, the outer can 14 has four side surfaces connecting the opening and the bottom surface. Two of the four sides are a pair of long sides connected to the two opposite long sides of the opening. Each long side surface is the surface having the largest area among the surfaces of the outer can 14, that is, the main surface. Further, each long side surface is a side surface extending in a direction intersecting (for example, orthogonal to) the first direction X. The remaining two sides, excluding the two long sides, are a pair of short sides connected to the opening of the outer can 14 and the short side of the bottom surface. The bottom surface, long side surface, and short side surface of the outer can 14 correspond to the bottom surface, long side surface, and short side surface of the housing 13, respectively.
  • the first surface 13a of the housing 13 is the upper surface of the non-aqueous electrolyte secondary battery 10.
  • the bottom surface of the housing 13 is the bottom surface of the non-aqueous electrolyte secondary battery 10
  • the long side surface of the housing 13 is the long side surface of the non-aqueous electrolyte secondary battery 10
  • the short side surface of the housing 13 is the non-aqueous electrolyte secondary battery.
  • the short side of the battery 10 is the surface on the upper surface side of the non-aqueous electrolyte secondary battery 10 in the secondary battery module 1
  • the surface on the bottom surface side of the non-aqueous electrolyte secondary battery 10 is the surface of the secondary battery module 1.
  • the bottom surface is defined as the short side surface of the non-aqueous electrolyte secondary battery 10, and the surface on the short side surface is defined as the side surface of the secondary battery module 1. Further, the upper surface side of the secondary battery module 1 is upward in the vertical direction, and the bottom surface side of the secondary battery module 1 is downward in the vertical direction.
  • the plurality of non-aqueous electrolyte secondary batteries 10 are arranged side by side at predetermined intervals so that the long sides of the adjacent non-aqueous electrolyte secondary batteries 10 face each other. Further, in the present embodiment, the output terminals 18 of the non-aqueous electrolyte secondary batteries 10 are arranged so as to face the same direction as each other, but may be arranged so as to face different directions.
  • the two adjacent non-aqueous electrolyte secondary batteries 10 are arranged (laminated) so that the positive electrode terminal 18a of one non-aqueous electrolyte secondary battery 10 and the negative electrode terminal 18b of the other non-aqueous electrolyte secondary battery 10 are adjacent to each other. Will be done.
  • the positive electrode terminal 18a and the negative electrode terminal 18b are connected in series via a bus bar.
  • the output terminals 18 having the same polarity in the plurality of adjacent non-aqueous electrolyte secondary batteries 10 are connected in parallel by a bus bar to form a non-aqueous electrolyte secondary battery block, and the non-aqueous electrolyte secondary battery blocks are connected to each other. It may be connected in series.
  • the insulating spacer 12 is arranged between two adjacent non-aqueous electrolyte secondary batteries 10 to electrically insulate the two non-aqueous electrolyte secondary batteries 10.
  • the insulating spacer 12 is made of, for example, a resin having an insulating property. Examples of the resin constituting the insulating spacer 12 include polypropylene, polybutylene terephthalate, and polycarbonate.
  • the plurality of non-aqueous electrolyte secondary batteries 10 and the plurality of insulating spacers 12 are alternately laminated.
  • the insulating spacer 12 is also arranged between the non-aqueous electrolyte secondary battery 10 and the end plate 4.
  • the insulating spacer 12 has a flat surface portion 20 and a wall portion 22.
  • the flat surface portion 20 is interposed between the long side surfaces of the two adjacent non-aqueous electrolyte secondary batteries 10 that face each other. As a result, insulation between the outer cans 14 of the adjacent non-aqueous electrolyte secondary batteries 10 is ensured.
  • the wall portion 22 extends from the outer edge portion of the flat surface portion 20 in the direction in which the non-aqueous electrolyte secondary batteries 10 are lined up, and covers a part of the upper surface, side surfaces, and a part of the bottom surface of the non-aqueous electrolyte secondary battery 10. Thereby, for example, it is possible to secure a side distance between the adjacent non-aqueous electrolyte secondary batteries 10 or between the non-aqueous electrolyte secondary batteries 10 and the end plate 4.
  • the wall portion 22 has a notch 24 that exposes the bottom surface of the non-aqueous electrolyte secondary battery 10.
  • the insulating spacer 12 has upward urging receiving portions 26 at both ends in the second direction Y.
  • the elastic body 40 is arranged along the first direction X together with the plurality of non-aqueous electrolyte secondary batteries 10. That is, the first direction X is also the stacking direction of the electrode body 38 as described above, but is also the arrangement direction of the non-aqueous electrolyte secondary battery 10 and the elastic body 40.
  • the elastic body 40 has a sheet shape, and is interposed between the long side surface of each non-aqueous electrolyte secondary battery 10 and the flat surface portion 20 of each insulating spacer 12, for example.
  • the elastic body 40 arranged between two adjacent non-aqueous electrolyte secondary batteries 10 may be a single sheet or a laminated body in which a plurality of sheets are laminated.
  • the elastic body 40 may be fixed to the surface of the flat surface portion 20 by adhesion or the like.
  • the flat surface portion 20 may be provided with a recess, and the elastic body 40 may be fitted into the recess.
  • the elastic body 40 and the insulating spacer 12 may be integrally molded.
  • the elastic body 40 may also serve as the flat surface portion 20.
  • a plurality of non-aqueous electrolyte secondary batteries 10, a plurality of insulating spacers 12, and a plurality of elastic bodies 40 arranged side by side are sandwiched by a pair of end plates 4 in the first direction X.
  • the end plate 4 is made of, for example, a metal plate or a resin plate.
  • the end plate 4 is provided with a screw hole 4a through which the end plate 4 is penetrated in the first direction X and the screw 28 is screwed.
  • the pair of restraint members 6 are elongated members having the first direction X as the longitudinal direction.
  • the pair of restraint members 6 are arranged so as to face each other in the second direction Y.
  • a laminated body 2 is interposed between the pair of restraint members 6.
  • Each restraint member 6 includes a main body portion 30, a support portion 32, a plurality of urging portions 34, and a pair of fixing portions 36.
  • the main body portion 30 is a rectangular portion extending in the first direction X.
  • the main body 30 extends parallel to the side surface of each non-aqueous electrolyte secondary battery 10.
  • the support portion 32 extends in the first direction X and projects in the second direction Y from the lower end of the main body portion 30.
  • the support portion 32 is a plate-like body continuous in the first direction X, and supports the laminated body 2.
  • the plurality of urging portions 34 are connected to the upper ends of the main body portion 30 and project in the second direction Y.
  • the support portion 32 and the urging portion 34 face each other in the third direction Z.
  • the plurality of urging portions 34 are arranged in the first direction X at predetermined intervals.
  • Each urging portion 34 has, for example, a leaf spring shape, and urges each non-aqueous electrolyte secondary battery 10 toward the support portion 32.
  • the pair of fixing portions 36 are plate-like bodies protruding in the second direction Y from both ends of the main body portion 30 in the first direction X.
  • the pair of fixing portions 36 face each other in the first direction X.
  • Each fixing portion 36 is provided with a through hole 36a through which a screw 28 is inserted.
  • the restraint member 6 is fixed to the laminated body 2 by the pair of fixing portions 36.
  • the cooling plate 8 is a mechanism for cooling a plurality of non-aqueous electrolyte secondary batteries 10.
  • the laminated body 2 is placed on the main surface of the cooling plate 8 in a state of being restrained by a pair of restraining members 6, and a fastening member such as a screw is formed in the through hole 32a of the support portion 32 and the through hole 8a of the cooling plate 8. Is inserted and fixed to the cooling plate 8.
  • FIG. 3 is a cross-sectional view schematically showing how the non-aqueous electrolyte secondary battery expands.
  • the number of non-aqueous electrolyte secondary batteries 10 is thinned out. Further, the illustration of the internal structure of the non-aqueous electrolyte secondary battery 10 is simplified, and the illustration of the insulating spacer 12 is omitted.
  • an electrode body 38 (positive electrode 38a, negative electrode 38b, separator 38d) is housed inside each non-aqueous electrolyte secondary battery 10.
  • the outer can 14 expands and contracts due to the expansion and contraction of the electrode body 38 due to charging and discharging.
  • a load G1 toward the outside in the first direction X is generated in the laminated body 2. That is, the elastic body 40 arranged together with the non-aqueous electrolyte secondary battery 10 is the electrode in the first direction X (the arrangement direction of the non-aqueous electrolyte secondary battery 10 and the elastic body 40) from the non-aqueous electrolyte secondary battery 10. The load is received in the stacking direction of the body 38). On the other hand, a load G2 corresponding to the load G1 is applied to the laminated body 2 by the restraint member 6.
  • FIG. 4 is a schematic cross-sectional view showing the state of the electrode body at the time of the nail piercing test.
  • the positive electrode 38a includes a positive electrode current collector 50 and a positive electrode active material layer 52 formed on the positive electrode current collector 50
  • the negative electrode 38b is a negative electrode current collector 54 and a negative electrode current collector 54.
  • the negative electrode active material layer 56 formed above is provided. Then, the nail pierces the non-aqueous electrolyte secondary battery by the nail piercing test, and as shown in FIG.
  • the nail 58 penetrates the positive electrode 38a and the separator 38d and reaches the negative electrode 38b, and the positive electrode current collector 50 and the negative electrode collection
  • the electric body 54 comes into direct contact with the nail 58, an internal short circuit occurs, a short circuit current flows, and the non-aqueous electrolyte secondary battery generates heat.
  • the positive electrode current collector 50 of the present embodiment contains elements other than Al and Al, and has a low thermal conductivity Al-containing positive electrode having a thermal conductivity of 65 W / (m ⁇ K) to 150 W / (m ⁇ K). It is a current collector.
  • a positive electrode current collector containing low thermal conductivity Al heat tends to concentrate on the short-circuited portion (the portion of the positive electrode current collector that is in direct contact with the nail), so that the positive electrode current collector 50 is melted at the short-circuited portion. Is accelerated. That is, in the nail piercing test, the time from the occurrence of the internal short circuit to the melting of the positive electrode current collector 50 is shortened.
  • the elastic body 40 of the present embodiment is an elastic body having a compressive elastic modulus of 5 MPa to 120 MPa. Then, the elastic body having a compressive elastic modulus of 5 MPa to 120 MPa relaxes the load G1 toward the outside in the first direction X and the load G2 corresponding to the load G1, so that an excess between the positive electrode 38a and the negative electrode 38b is obtained. Proximity is suppressed. As a result, the above-mentioned low thermal conductivity Al-containing positive electrode current collector is used, but an elastic body having a compressive elastic modulus of 5 MPa to 120 MPa is not arranged, or an elastic body exceeding 120 MPa is arranged.
  • FIG. 5 is a schematic cross-sectional view showing a state in which the elastic body is arranged in the housing.
  • the elastic body 40 is not limited to the case where it is arranged together with the non-aqueous electrolyte secondary battery 10 as described above, that is, when it is arranged outside the housing 13, and may be arranged inside the housing 13.
  • the elastic bodies 40 shown in FIG. 5 are arranged at both ends of the electrode body 38 in the stacking direction (first direction X) of the electrode bodies 38. Further, the elastic body 40 is sandwiched between the inner wall of the housing 13 and the electrode body 38.
  • the elastic body 40 When the electrode body 38 expands due to charging / discharging of the non-aqueous electrolyte secondary battery 10, a load is generated on the electrode body 38 toward the outside in the first direction X. That is, the elastic body 40 arranged in the housing 13 receives a load from the electrode body 38 in the first direction X (the stacking direction of the electrode bodies 38).
  • the elastic body 40 has a compressive elastic modulus of 5 MPa to 120 MPa
  • the positive electrode current collector 50 contains elements other than Al and Al
  • the thermal conductivity is 65 W / (m ⁇ K) to 150 W / (m ⁇ . If it is a positive electrode current collector containing Al-containing low thermal conductivity Al of K), the same action and effect as described above can be obtained.
  • the elastic body 40 in the housing 13 may be arranged anywhere as long as it can receive a load from the electrode body 38 in the stacking direction of the electrode body 38.
  • the elastic body 40 may be arranged at the winding core portion 39 of the cylindrical winding type electrode body 38.
  • the stacking direction of the cylindrically wound electrode body 38 is the radial direction (R) of the electrode body 38.
  • R the radial direction of the electrode body 38.
  • the elastic body 40 may be arranged between the adjacent electrode bodies 38. Further, in the case of the flat winding type, the elastic body may be similarly arranged at the center of the electrode body.
  • the positive electrode 38a, the negative electrode 38b, the separator 38d, the elastic body 40, and the electrolytic solution will be described in detail below.
  • the positive electrode 38a has a positive electrode current collector 50 and a positive electrode active material layer 52 formed on the positive electrode current collector 50.
  • the positive electrode current collector 50 may contain elements other than Al and Al and may have a thermal conductivity in the range of 65 W / (m ⁇ K) to 150 W / (m ⁇ K). Elements other than Al and Al may or may not be alloyed.
  • the content of Al in the positive electrode current collector 50 is preferably more than 50% by mass, preferably 75% by mass or more, in terms of suppressing an increase in the resistance value of the positive electrode current collector 50, for example. More preferably, it is more preferably 90% by mass or more.
  • the upper limit of the Al content in the positive electrode current collector 50 is, for example, 98% by mass or less.
  • the elements other than Al contained in the positive electrode current collector 50 are not particularly limited as long as the thermal conductivity can be adjusted within the above range, and examples thereof include Mg, Si, Sn, Cu, Zn, and Ge. Can be mentioned. Among these, Mg is preferable because it is easy to adjust the thermal conductivity of the positive electrode current collector 50.
  • the content of Mg in the positive electrode current collector 50 is preferably 1.5% by mass or more in terms of adjusting the thermal conductivity of the positive electrode current collector 50 to 150 W / (m ⁇ K) or less. It is preferably mass% or more. As the content of Mg in the positive electrode current collector 50 increases, the positive electrode current collector 50 becomes harder.
  • the flat winding type electrode body when the positive electrode current collector becomes hard, for example, in a non-aqueous electrolyte secondary battery adopting a flat winding type electrode body, the flat winding type electrode body is expanded and contracted by charging and discharging. Stress may be applied to the corners (where the electrodes and separators are curved), and the positive electrode current collector at the corners of the electrode may break. However, in the present embodiment, the stress applied to the corners of the flat winding type electrode body is also relaxed by the elastic body 40 of 5 MPa to 120 MPa, so that even if the content of Mg in the positive electrode current collector 50 is increased. , The breakage of the positive electrode current collector 50 is suppressed.
  • the content of Mg in the positive electrode current collector 50 is, for example, less than 50% by mass, and considering the resistance value of the positive electrode current collector 50, it is preferably 10% by mass or less, more preferably 6% by mass or less.
  • the thermal conductivity of the positive electrode current collector 50 may be in the range of 65 W / (m ⁇ K) to 150 W / (m ⁇ K), but in terms of further suppressing the amount of heat generated by the battery during the nail piercing test.
  • the range of 85 W / (m ⁇ K) to 130 W / (m ⁇ K) is preferable, and the range of 95 W / (m ⁇ K) to 120 W / (m ⁇ K) is more preferable.
  • the thermal diffusivity (W / m ⁇ K) of the positive electrode current collector 50 is obtained by substituting into the following formula (1).
  • -Thermal diffusivity Measured at 25 ° C. using a xenon flash analyzer (registered trademark: LFA 467HT HyperFlash, manufactured by Netch Japan Co., Ltd.).
  • -Specific heat Measured by comparison with a sapphire standard material using a differential scanning calorimeter (DSC).
  • DSC differential scanning calorimeter
  • -Density Measured using Archimedes' principle.
  • Thermal conductivity (thermal diffusivity) x (specific heat) x (density) (1)
  • the cathode current collector 50 for example, by charging and discharging, from the viewpoint of suppressing the breakage of the positive electrode current collector 50 at the corner portion of the flat wound electrode body, Young 45kN / mm 2 ⁇ 73.5kN / mm 2 It is preferable to have a rate. Young's modulus is measured by a tensile test (for example, manufactured by MinebeaMitsumi, a tensile compression tester Technograph TG-2kN) under a temperature condition of 25 ° C.
  • the positive electrode current collector 50 preferably has a liquidus temperature of 650 ° C. or lower in that it melts quickly during a nail piercing test and effectively suppresses the calorific value of the battery.
  • the lower limit of the liquidus temperature of the positive electrode current collector 50 is, for example, 450 ° C. or higher.
  • the liquidus line temperature is a temperature at which a solid phase begins to form from the liquid phase.
  • the liquidus temperature is obtained by differential scanning calorimetry (DSC).
  • the positive electrode active material layer 52 contains a positive electrode active material.
  • the positive electrode active material layer 52 preferably contains a conductive material or a binder in addition to the positive electrode active material.
  • the positive electrode active material layer 52 is preferably provided on both sides of the positive electrode current collector 50.
  • a lithium transition metal composite oxide or the like is used as the positive electrode active material.
  • Metallic elements contained in the lithium transition metal composite oxide include Ni, Co, Mn, Al, B, Mg, Ti, V, Cr, Fe, Cu, Zn, Ga, Sr, Zr, Nb, In and Sn. , Ta, W and the like. Above all, it is preferable to contain at least one of Ni, Co and Mn.
  • suitable composite oxides include lithium transition metal composite oxides containing Ni, Co and Mn, and lithium transition metal composite oxides containing Ni, Co and Al.
  • Examples of the conductive material include carbon materials such as carbon black, acetylene black, ketjen black, and graphite.
  • Examples of the binder include fluororesins such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVdF), polyacrylonitrile (PAN), polyimide resins, acrylic resins, and polyolefin resins. Further, these resins may be used in combination with a cellulose derivative such as carboxymethyl cellulose (CMC) or a salt thereof, polyethylene oxide (PEO), or the like.
  • CMC carboxymethyl cellulose
  • PEO polyethylene oxide
  • a positive electrode mixture slurry containing a positive electrode active material, a conductive material, a binder, and the like is applied onto the positive electrode current collector 50, the coating film is dried, and then rolled to obtain a positive electrode active material layer. It can be produced by forming 52 on the positive electrode current collector 50.
  • the negative electrode 38b has a negative electrode current collector 54 and a negative electrode active material layer 56 formed on the negative electrode current collector 54.
  • a metal foil stable in the potential range of the negative electrode 38b, a film in which the metal is arranged on the surface layer, or the like is used, and examples thereof include copper and the like.
  • the negative electrode active material layer 56 contains a negative electrode active material.
  • the negative electrode active material layer 56 preferably contains a binder or the like. Examples of the binder include the same binders contained in the positive electrode active material layer 52.
  • the negative electrode active material layer 56 is preferably formed on both surfaces of the negative electrode current collector 54.
  • Examples of the negative electrode active material include those capable of reversibly storing and releasing lithium ions, and specifically, carbon materials such as natural graphite, artificial graphite, carbon-resistant carbon, and easily graphitized carbon, and the above-mentioned carbon materials.
  • a surface-modified carbon material whose surface is covered with an amorphous carbon film, a metal that alloys with lithium such as silicon (Si) and tin (Sn), or an alloy containing a metal element such as Si and Sn, Si, Sn and the like. Examples thereof include oxides containing the metal elements of. These may be used alone or in combination of two or more.
  • a negative electrode mixture slurry containing a negative electrode active material, a binder, and the like is applied onto a negative electrode current collector 54, the coating film is dried, and then rolled to roll the negative electrode active material layer 56 into a negative electrode current collector. It can be produced by forming it on the body 54.
  • a porous sheet having ion permeability and insulating property is used for the separator 38d.
  • the porous sheet include a microporous thin film, a woven fabric, and a non-woven fabric.
  • an olefin resin such as polyethylene or polypropylene, cellulose or the like is preferable.
  • the separator 38d may be a laminate having a cellulose fiber layer and a thermoplastic resin fiber layer such as an olefin resin. Further, a multilayer separator containing a polyethylene layer and a polypropylene layer may be used, or a separator 38d coated with a material such as an aramid resin or ceramic may be used.
  • the material constituting the elastic body 40 examples include thermosetting elastomers such as natural rubber, urethane rubber, silicone rubber, and fluororubber, and thermoplastic elastomers such as polystyrene, olefin, polyurethane, polyester, and polyamide. .. In addition, these materials may be foamed. Further, a heat insulating material on which a porous material such as silica xerogel is supported is also exemplified.
  • the compressive elastic modulus of the negative electrode active material layer 56, the separator 38d, and the elastic body 40 as follows. It is preferable that the compressive elastic modulus of the separator 38d is smaller than the compressive elastic modulus of the negative electrode active material layer 56, and the compressive elastic modulus of the elastic body 40 is smaller than the compressive elastic modulus of the separator 38d. That is, the compressive elastic modulus is in the order of negative electrode active material layer 56> separator 38d> elastic body 40. Therefore, among the above, the negative electrode active material layer 56 is the most difficult to deform, and the elastic body 40 is the most easily deformed.
  • the compressive elastic modulus of the separator 38d may be 0.3 to 0.7 times the compressive elastic modulus of the negative electrode active material layer 56, for example, in terms of effectively suppressing an increase in resistance during high-rate charging / discharging. It is preferably 0.4 times to 0.6 times, and more preferably 0.4 times to 0.6 times.
  • the compressive elastic modulus of the elastic body 40 may be in the range of 5 MPa to 120 MPa, but is preferably in the range of 25 MPa to 100 MPa.
  • MPa load (N) / compression area (mm 2 ) ⁇ (sample deformation amount (mm) / sample thickness (mm)).
  • the compressive elastic modulus of the negative electrode active material layer 56 is calculated based on the compressive elastic modulus of the negative electrode current collector 54 and the negative electrode 38b. Further, when the compressive elastic modulus of the negative electrode active material layer 56 is obtained from the produced negative electrode 38b, the compressive elastic modulus of the negative electrode 38b is measured, and the negative electrode current collector 54 obtained by scraping the negative electrode active material layer 56 from the negative electrode 38b is compressed. The elastic modulus is measured, and the compressive elastic modulus of the negative electrode active material layer 56 is calculated based on these measured compressive elastic moduli.
  • Examples of the method of adjusting the compressive elastic modulus of the negative electrode active material layer 56 include a method of adjusting the rolling force applied to the negative electrode mixture slurry formed on the negative electrode current collector 54. Further, for example, the compressive elastic modulus of the negative electrode active material layer 56 can be adjusted by changing the material and physical properties of the negative electrode active material. The adjustment of the pressure elastic modulus of the negative electrode active material layer 56 is not limited to the above.
  • the compressive elastic modulus of the separator 38d is adjusted, for example, by controlling the selection of the material, the porosity, the pore diameter, and the like.
  • the compressive elastic modulus of the elastic body 40 is adjusted by, for example, the selection of the material, the shape, and the like.
  • the elastic body 40 may exhibit a uniform compressive elastic modulus on one surface, but may have a structure having different easiness of deformation in the surface as described below.
  • FIG. 7 is a schematic perspective view showing an example of an elastic body.
  • the elastic body 40 shown in FIG. 7 has a soft portion 44 and a hard portion 42.
  • the hard portion 42 is located closer to the outer edge portion of the elastic body 40 than the soft portion 44.
  • the elastic body 40 shown in FIG. 7 has a structure in which hard portions 42 are arranged on both ends in the second direction Y and soft portions 44 are arranged between the two hard portions 42.
  • the soft portion 44 is preferably arranged so as to overlap the center of the long side surface of the housing 13 and to overlap the center of the electrode body 38 when viewed from the first direction X. Further, it is preferable that the hard portion 42 is arranged so as to overlap the outer edge of the long side surface of the housing 13 when viewed from the first direction X, and is arranged so as to overlap the outer edge of the electrode body 38.
  • the expansion of the non-aqueous electrolyte secondary battery 10 is mainly caused by the expansion of the electrode body 38. Then, the electrode body 38 expands more as it gets closer to the center. That is, the electrode body 38 is largely displaced in the first direction X as it is closer to the center, and is displaced as it is smaller toward the outer edge from the center. Further, with the displacement of the electrode body 38, the non-aqueous electrolyte secondary battery 10 is displaced more in the first direction X toward the portion closer to the center of the long side surface of the housing 13, and is centered on the long side surface of the housing 13. The displacement is smaller toward the outer edge. Therefore, when the elastic body 40 shown in FIG.
  • the elastic body 40 receives a large load generated by the large displacement of the electrode body 38 at the soft portion 44, and the small displacement of the electrode body 38 causes the elastic body 40 to receive a large load.
  • the generated small load can be received by the hard portion 42.
  • the elastic body 40 shown in FIG. 7 is arranged outside the housing 13, the elastic body 40 receives a large load generated by a large displacement of the non-aqueous electrolyte secondary battery 10 at the soft portion 44, and the non-aqueous electrolyte secondary battery 10.
  • the hard portion 42 can receive a small load generated by a small displacement of the secondary battery 10.
  • the elastic body 40 shown in FIG. 7 has a recess 46 recessed in the first direction X.
  • a part of the non-recessed portion adjacent to the recess 46 can be displaced toward the recess 46 when a load is received from the non-aqueous electrolyte secondary battery 10 or the electrode body 38. Therefore, by providing the recess 46, the non-recessed portion can be easily deformed.
  • the recess 46 occupies the area of the concave portion 46 in the area of the soft portion 44 when viewed from the first direction X. It is preferably larger than the area ratio.
  • the recess 46 is arranged only in the soft portion 44, but the recess 46 may be arranged in the hard portion 42.
  • the recess 46 includes a core portion 46a and a plurality of wire portions 46b.
  • the core portion 46a is circular and is arranged at the center of the elastic body 40 when viewed from the first direction X.
  • the plurality of wire portions 46b extend radially from the core portion 46a. Since the wire portion 46b spreads radially, the closer to the core portion 46a, the higher the proportion of the wire portion 46b, and the smaller the number of non-recessed portions. Therefore, the region closer to the core portion 46a is more likely to be deformed in the non-recessed portion.
  • the elastic body 40 may have a plurality of through holes penetrating the elastic body 40 in the first direction X in place of or together with the recess 46 described above. ..
  • the non-through hole forming portion can be easily deformed. Therefore, in order to make the soft portion 44 more easily deformed than the hard portion 42, the ratio of the area of the through hole to the area of the soft portion 44 is the ratio of the area of the through hole to the area of the hard portion 42 when viewed from the first direction X. It is preferable to make it larger than the ratio.
  • FIG. 8 is a partial schematic cross-sectional view of an elastic body sandwiched between the electrode body and the housing.
  • the elastic body 40 receives a load from the electrode body 38 in the stacking direction (first direction X) of the electrode body 38.
  • the elastic body 40 has a base material 42a on which a hard portion 42 having a predetermined hardness is formed, and a soft portion 44 softer than the hard portion 42.
  • the hard portion 42 is a protruding portion that protrudes from the base material 42a toward the electrode body 38, and is fractured or plastically deformed by receiving a load of a predetermined value or more.
  • the soft portion 44 has a sheet shape, and is arranged on the electrode body 38 side of the base material 42a on which the hard portion 42 is formed.
  • the soft portion 44 is separated from the electrode body 38.
  • the soft portion 44 has a through hole 44a at a position overlapping the hard portion 42 when viewed from the first direction X, the hard portion 42 is inserted into the through hole 44a, and the tip of the hard portion 42 protrudes from the soft portion 44. do.
  • the elastic body 40 shifts from the first state in which the load from the electrode body 38 is received by the hard portion 42 to the second state in which the load is received by the soft portion 44. That is, the elastic body 40 first receives a load in the stacking direction of the electrode body 38 due to the expansion of the electrode body 38 by the hard portion 42 (first state). After that, when the expansion amount of the electrode body 38 increases for some reason and a load that cannot be received by the hard portion 42 is applied to the hard portion 42, the hard portion 42 is broken or plastically deformed, and the electrode body 38 becomes the soft portion 44. They come into contact with each other and receive a load in the stacking direction of the electrode body 38 by the soft portion 44 (second state).
  • compressive elastic modulus MPa
  • the electrolytic solution is, for example, a non-aqueous electrolytic solution containing a supporting salt in an organic solvent (non-aqueous solvent).
  • a non-aqueous solvent for example, esters, ethers, nitriles, amides, and a mixed solvent of two or more of these are used.
  • the supporting salt for example, a lithium salt such as LiPF 6 is used.
  • a lithium transition metal composite oxide represented by the general formula LiNi 0.82 Co 0.15 Al 0.03 O 2 was used as the positive electrode active material.
  • This positive electrode active material, acetylene black, and polyvinylidene fluoride are mixed at a solid content mass ratio of 97: 2: 1, and N-methyl-2-pyrrolidone (NMP) is used as a dispersion medium to prepare a positive electrode mixture.
  • NMP N-methyl-2-pyrrolidone
  • Al-Mg As a positive electrode current collector, Al-Mg has a thermal conductivity of 150 W / (m ⁇ K), a Mg content of 1.5 mass%, a liquidus temperature of 651 ° C., and a Young's modulus of 68.6 kN / mm 2.
  • An alloy foil was prepared.
  • the positive electrode mixture slurry is applied to both sides of the Al—Mg alloy foil, the coating film is dried and rolled, and then cut into a predetermined electrode size to form positive electrode active material layers on both sides of the positive electrode current collector. A positive electrode was obtained.
  • Graphite particles as a negative electrode active material, SBR dispersion, and CMC-Na are mixed at a solid content mass ratio of 100: 1: 1.5, and water is used as a dispersion medium to prepare a negative electrode mixture slurry.
  • This negative electrode mixture slurry is applied to both sides of a negative electrode current collector made of copper foil, the coating film is dried, rolled, and then cut into a predetermined electrode size to form negative electrode active material layers on both sides of the negative electrode current collector. Was formed to obtain a negative electrode.
  • the compressive elastic modulus of the negative electrode active material layer was measured at the time of producing the negative electrode, it was 660 MPa.
  • Ethylene carbonate (EC), methyl ethyl carbonate (EMC), and dimethyl carbonate (DMC) were mixed in a volume ratio of 3: 3: 4.
  • An electrolytic solution was prepared by dissolving LiPF 6 in the mixed solvent so as to have a concentration of 1.4 mol / L.
  • a negative electrode, a separator having a compressive elastic modulus of 120 MPa, and a positive electrode were laminated in this order, wound, and then molded into a flat shape to prepare a flatly wound electrode body. Then, the negative electrode and the positive electrode are connected to the positive electrode terminal and the negative electrode terminal, and the negative electrode and the positive electrode are housed in the exterior body made of aluminum laminate.
  • a water electrolyte secondary battery was manufactured.
  • the prepared non-aqueous electrolyte secondary battery was sandwiched between a pair of elastic bodies (urethane foam having a compressive elastic modulus of 60 MPa), and further sandwiched and fixed by a pair of end plates to prepare a secondary battery module. ..
  • Example 2 As a positive electrode current collector, Al-Mg has a thermal conductivity of 138 W / (m ⁇ K), an Mg content of 2.4 mass%, a liquidus temperature of 653 ° C., and a Young's modulus of 70.6 kN / mm 2.
  • a secondary battery module was produced in the same manner as in Example 1 except that the alloy foil was used.
  • Example 3 As a positive electrode current collector, Al-Mg has a thermal conductivity of 117 W / (m ⁇ K), an Mg content of 4.7 mass%, a liquidus temperature of 640 ° C., and a Young's modulus of 70.6 kN / mm 2.
  • a secondary battery module was produced in the same manner as in Example 1 except that the alloy foil was used.
  • Example 4 As the positive electrode current collector, an Al-Mg alloy foil having a thermal conductivity of 65 W / (m ⁇ K), a Mg content of 93 mass%, a liquidus temperature of 595 ° C., and a Young's modulus of 45 kN / mm 2 is used.
  • a secondary battery module was produced in the same manner as in Example 1 except for the above.
  • Example 5 The secondary battery module was used in the same manner as in Example 1 except that the Al—Mg alloy foil of Example 3 was used as the positive electrode current collector and urethane foam having a compressive elastic modulus of 5 MPa was used as the elastic body. Made.
  • Example 6 The secondary battery module was used in the same manner as in Example 1 except that the Al—Mg alloy foil of Example 3 was used as the positive electrode current collector and urethane foam having a compressive elastic modulus of 120 MPa was used as the elastic body. Made.
  • ⁇ Comparative example 1> As the positive electrode current collector, an Al foil having a thermal conductivity of 190 W / (m ⁇ K), a Mg content of 0% by mass, a liquidus temperature of 650 ° C., and a Young's modulus of 68.6 kN / mm 2 was used. A secondary battery module was produced in the same manner as in Example 1 except for the above.
  • ⁇ Comparative example 2> As the positive electrode current collector, an Al foil having a thermal conductivity of 180 W / (m ⁇ K), a Mg content of 0% by mass, a liquidus temperature of 610 ° C., and a Young's modulus of 73.5 kN / mm 2 was used. A secondary battery module was produced in the same manner as in Example 1 except for the above.
  • Example 3 The Al—Mg alloy foil of Example 3 was used as the positive electrode current collector, a separator having a compressive elastic modulus of 230 MPa was used, and urethane foam having a compressive elastic modulus of 200 MPa was used as the elastic body.
  • a secondary battery module was produced in the same manner as in Example 1 except for the above.
  • the internal battery resistance was measured under the following conditions.
  • the secondary battery module adjusted to a charge state of SOC 60% was subjected to constant current discharge at a rate of 5C for 10 seconds under a temperature condition of 25 ° C., and the voltage drop amount (V) was calculated. Then, the voltage drop value (V) was divided by the corresponding current value (I) to calculate the battery internal resistance ( ⁇ ).
  • Table 1 shows the physical characteristics of the positive electrode current collector, elastic body, separator, and negative electrode active material layer used in each Example and each Comparative Example, and the test results of each Example and each Comparative Example.
  • a positive electrode current collector having an elastic modulus of 5 MPa to 120 MPa, containing elements other than Al and Al, and having a thermal conductivity in the range of 65 W / (m ⁇ K) to 150 W / (m ⁇ K).
  • the calorific value of the battery in the nail piercing test was suppressed as compared with Comparative Examples 1 to 3 which did not satisfy the above requirements.
  • the secondary battery modules of each example and each comparative example are charged with a constant current of 0.33C at a constant current of 0.33C until the voltage becomes 4.2V under a temperature condition of 25 ° C., and then a constant current of 0.33C is obtained.
  • the constant current was discharged until the voltage became 3.0 V with the current. This charge / discharge cycle was performed 1000 cycles. Then, the secondary battery module was disassembled, a flat winding type electrode body was taken out, and it was confirmed whether or not the positive electrode current collector at the corner of the electrode body was broken. As a result, only in Comparative Example 3, the positive electrode current collector at the corner portion was broken.

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