WO2024161950A1 - 非水電解質二次電池 - Google Patents

非水電解質二次電池 Download PDF

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Publication number
WO2024161950A1
WO2024161950A1 PCT/JP2024/000641 JP2024000641W WO2024161950A1 WO 2024161950 A1 WO2024161950 A1 WO 2024161950A1 JP 2024000641 W JP2024000641 W JP 2024000641W WO 2024161950 A1 WO2024161950 A1 WO 2024161950A1
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Prior art keywords
insulating plate
electrolyte secondary
secondary battery
negative electrode
nonaqueous electrolyte
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PCT/JP2024/000641
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English (en)
French (fr)
Japanese (ja)
Inventor
薫 井上
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Priority to CN202480008604.2A priority Critical patent/CN120569837A/zh
Priority to JP2024574377A priority patent/JPWO2024161950A1/ja
Priority to EP24749905.6A priority patent/EP4661146A1/en
Priority to US19/150,021 priority patent/US20260031484A1/en
Publication of WO2024161950A1 publication Critical patent/WO2024161950A1/ja
Anticipated expiration legal-status Critical
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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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H01M4/386—Silicon or alloys based on silicon
    • 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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/317—Re-sealable arrangements
    • H01M50/325—Re-sealable arrangements comprising deformable valve members, e.g. elastic or flexible valve members
    • 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/342—Non-re-sealable arrangements
    • 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/342—Non-re-sealable arrangements
    • H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/474—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their position inside the 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/477—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their shape
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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
    • H01M2004/027—Negative electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary 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
    • 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 a non-aqueous electrolyte secondary battery.
  • Non-aqueous electrolyte secondary batteries such as lithium ion secondary batteries have been known that include an electrode assembly (wound body) in which a positive electrode and a negative electrode are wound with a separator interposed therebetween, and an outer can that contains the electrode assembly and an electrolyte.
  • Patent Documents 1 and 2 disclose non-aqueous electrolyte secondary batteries in which a space is provided in the lower part of the battery by forming a step in the lower part of the outer can.
  • the nonaqueous electrolyte secondary batteries disclosed in Patent Documents 1 and 2 have a space at the bottom of the battery.
  • the object of this disclosure is to provide a nonaqueous electrolyte secondary battery that can smoothly vent high-temperature gas inside the battery to the outside of the battery when the battery generates abnormal heat, while suppressing internal short circuits.
  • a nonaqueous electrolyte secondary battery comprises an electrode assembly in which a positive electrode and a negative electrode are wound with a separator interposed therebetween, a bottomed cylindrical outer can housing the electrode assembly, a sealing body that closes the opening of the outer can, an insulating plate located between the electrode assembly and the bottom of the outer can, and a spacer located between the insulating plate and the bottom of the outer can, the sealing body having a safety valve that releases the internal pressure of the outer can when the internal pressure rises to or exceeds a predetermined level, and the spacer has a plurality of grooves on the surface facing the insulating plate that extend in one direction, and the plurality of grooves are spaced apart from one another in another direction perpendicular to the one direction.
  • a nonaqueous electrolyte secondary battery includes an electrode assembly in which a positive electrode and a negative electrode are wound with a separator interposed therebetween, a bottomed cylindrical outer can housing the electrode assembly, a sealing body that closes the opening of the outer can, and an insulating plate located between the electrode assembly and the bottom of the outer can, the sealing body having a safety valve that releases the internal pressure of the outer can when the internal pressure of the outer can rises to a predetermined level or higher, and at least one of the surface of the insulating plate facing the bottom of the outer can and the inner surface of the bottom of the outer can has multiple grooves extending in one direction, and the multiple grooves are spaced apart from one another in another direction perpendicular to the one direction.
  • the nonaqueous electrolyte secondary battery disclosed herein can smoothly vent high-temperature gases inside the battery to the outside when the battery generates abnormal heat while suppressing internal short circuits.
  • FIG. 1 is a cross-sectional view of a nonaqueous electrolyte secondary battery according to an embodiment
  • 2 is a plan view of an insulating plate included in the nonaqueous electrolyte secondary battery of FIG. 1 .
  • FIG. 4 is a plan view of an insulating plate according to another embodiment.
  • FIG. 4 is a plan view of an insulating plate according to another embodiment.
  • 2 is a plan view of a spacer included in the nonaqueous electrolyte secondary battery of FIG. 1 .
  • 2 is an enlarged perspective view of a groove formed in a spacer included in the nonaqueous electrolyte secondary battery of FIG. 1 .
  • FIG. 2 is a cross-sectional view of a nonaqueous electrolyte secondary battery according to another embodiment.
  • FIG. 2 is a cross-sectional view of a nonaqueous electrolyte secondary battery according to another embodiment.
  • a cylindrical battery in which a wound electrode body is housed in a cylindrical exterior can with a bottom is exemplified, but the exterior can of the battery is not limited to a cylindrical exterior can and may be, for example, a rectangular exterior can (rectangular battery) or a coin-shaped exterior can (coin battery), or may be an exterior can made of a laminate sheet including a metal layer and a resin layer (laminated battery).
  • FIG. 1 is a schematic diagram showing a cross section of a non-aqueous electrolyte secondary battery (hereinafter, simply referred to as a battery) 10 according to an embodiment.
  • the battery 10 includes an electrode body 14, a non-aqueous electrolyte (not shown), and an exterior can 20 that contains the electrode body 14 and the non-aqueous electrolyte.
  • the electrode body 14 includes a positive electrode 11, a negative electrode 12, and a separator 13, and has a structure in which the positive electrode 11 and the negative electrode 12 are spirally wound with the separator 13 interposed therebetween.
  • the exterior can 20 is a cylindrical metal container with a bottom that is open on one axial side, and the opening of the exterior can 20 is closed by a sealing body 19.
  • the sealing body 19 has a safety valve that releases the internal pressure when the internal pressure of the exterior can 20 rises to a predetermined level or higher.
  • the sealing body 19 side in the axial direction (height direction) of the battery 10 is referred to as the "upper” side
  • the bottom 21 side of the exterior can 20 in the axial direction is referred to as the "lower” side.
  • the non-aqueous electrolyte has lithium ion conductivity.
  • the non-aqueous electrolyte may be a liquid electrolyte (electrolytic solution) or a solid electrolyte.
  • the liquid electrolyte includes a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent.
  • a non-aqueous solvent for example, esters, ethers, nitriles, amides, and mixed solvents of two or more of these are used as the non-aqueous solvent.
  • the non-aqueous solvent include ethylene carbonate (EC), ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), diethyl carbonate (DEC), and mixed solvents of these.
  • the non-aqueous solvent may contain a halogen-substituted product (e.g., fluoroethylene carbonate, etc.) in which at least a part of the hydrogen of these solvents is replaced with a halogen atom such as fluorine.
  • a halogen-substituted product e.g., fluoroethylene carbonate, etc.
  • a lithium salt such as LiPF6 is used as the electrolyte salt.
  • the solid electrolyte for example, a solid or gel-like polymer electrolyte, an inorganic solid electrolyte, etc. can be used.
  • the inorganic solid electrolyte a material known in all-solid-state lithium ion secondary batteries, etc. (for example, an oxide-based solid electrolyte, a sulfide-based solid electrolyte, a halogen-based solid electrolyte, etc.) can be used.
  • the polymer electrolyte includes, for example, a lithium salt and a matrix polymer, or a non-aqueous solvent, a lithium salt, and a matrix polymer.
  • the matrix polymer for example, a polymer material that absorbs a non-aqueous solvent and gels is used.
  • the polymer material for example, a fluororesin, an acrylic resin, a polyether resin, etc. can be used.
  • the positive electrode 11, negative electrode 12, and separator 13 that make up the electrode body 14 are all long, strip-like bodies that are wound in a spiral shape and stacked alternately in the radial direction of the electrode body 14.
  • the negative electrode 12 is formed to be slightly larger than the positive electrode 11 in order to prevent lithium precipitation. That is, the negative electrode 12 is formed to be longer in the longitudinal direction and width direction (short direction) than the positive electrode 11.
  • the separator 13 is formed to be at least slightly larger than the positive electrode 11, and two of them are arranged to sandwich the positive electrode 11.
  • the battery 10 includes a first insulating plate 15 and a second insulating plate 16 that are arranged above and below the electrode body 14, respectively.
  • the positive electrode 11 has a positive electrode core 40 and a positive electrode mixture layer 41 formed on the positive electrode core 40.
  • a foil of a metal that is stable in the potential range of the positive electrode 11, such as aluminum or an aluminum alloy, or a film with the metal disposed on the surface layer can be used.
  • the positive electrode mixture layer 41 contains a positive electrode active material, a conductive agent, and a binder.
  • the positive electrode 11 can be produced, for example, by applying a positive electrode mixture slurry containing a positive electrode active material, a conductive agent, and a binder, onto the positive electrode core 40, drying the coating, and then compressing it to form the positive electrode mixture layer 41 on both sides of the positive electrode core 40.
  • the positive electrode mixture layer 41 contains particulate lithium metal composite oxide as a positive electrode active material.
  • the lithium metal composite oxide is a composite oxide containing metal elements such as Co, Mn, Ni, and Al in addition to Li.
  • the metal elements constituting the lithium metal composite oxide are, for example, at least one selected from Mg, Al, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Y, Zr, Sn, Sb, W, Pb, and Bi. Among them, it is preferable to contain at least one selected from Co, Ni, Al, and Mn.
  • suitable composite oxides include lithium metal composite oxides containing Ni, Co, and Mn, and lithium metal composite oxides containing Ni, Co, and Al.
  • Examples of the conductive agent contained in the positive electrode mixture layer 41 include carbon black such as acetylene black and ketjen black, graphite, carbon nanotubes (CNT), carbon nanofibers, graphene, and other carbon materials.
  • Examples of the binder contained in the positive electrode mixture layer 41 include fluorine-containing resins such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF), polyacrylonitrile (PAN), polyimide, acrylic resin, polyolefin, and the like. These resins may also be used in combination with carboxymethylcellulose (CMC) or a salt thereof, polyethylene oxide (PEO), and the like.
  • the negative electrode 12 has a negative electrode core 50 and a negative electrode mixture layer 51 formed on the negative electrode core 50.
  • a foil of a metal such as copper or a copper alloy that is stable in the potential range of the negative electrode 12, or a film with the metal disposed on the surface layer, can be used.
  • the negative electrode mixture layer 51 contains a negative electrode active material, a binder, and, if necessary, a conductive agent.
  • the negative electrode 12 can be produced by applying a negative electrode mixture slurry containing a negative electrode active material and a binder, etc., to the surface of the negative electrode core 50, drying the coating, and then compressing it to form the negative electrode mixture layer 51 on both sides of the negative electrode core 50.
  • the negative electrode mixture layer 51 preferably contains a carbon material and a silicon-containing material as the negative electrode active material. By including a silicon-containing material, it becomes easier to achieve both high capacity and excellent cycle characteristics.
  • the negative electrode mixture layer 51 may use a material containing at least one of an element that alloys with Li, such as Sn, and a material that contains the element, as the negative electrode active material.
  • the content of the silicon-containing material is preferably 10% by mass or more, more preferably 12% by mass or more, and even more preferably 15% by mass or more of the total mass of the negative electrode active material.
  • silicon-containing materials have a larger expansion rate during charging and discharging than carbon materials, so that repeated charging and discharging causes the electrode body 14 to expand in the vertical direction of the battery, making it easier for the exhaust path for high-temperature gas at the bottom of the battery to become clogged.
  • a spacer 28 having multiple grooves 29 formed therein is provided, so that an exhaust path for high-temperature gas is secured at the bottom of the battery. Therefore, when a silicon-containing material is included as the negative electrode active material, the effect of the present disclosure becomes more pronounced.
  • the carbon material that functions as the negative electrode active material is, for example, at least one selected from the group consisting of natural graphite, artificial graphite, soft carbon, and hard carbon. Among them, it is preferable to use, as the carbon material, at least artificial graphite such as massive artificial graphite (MAG) and graphitized mesophase carbon microbeads (MCMB), natural graphite such as flake graphite, massive graphite, and earthy graphite, or a mixture of these.
  • the volume-based D50 of the carbon material is, for example, 1 ⁇ m or more and 30 ⁇ m or less, and preferably 5 ⁇ m or more and 25 ⁇ m or less.
  • the content of the silicon-containing material is preferably 5% by mass or more, more preferably 8% by mass or more, and even more preferably 10% by mass or more of the total mass of the negative electrode active material.
  • silicon-containing materials undergo a larger volume change during charging and discharging than carbon materials. Therefore, when a silicon-containing material is included as the negative electrode active material, repeated charging and discharging causes the electrode body 14 to expand in the vertical direction of the battery, making the exhaust path for high-temperature gas more likely to become clogged.
  • a spacer 28 having multiple grooves 29 formed therein is provided at the bottom of the battery, thereby ensuring an exhaust path for high-temperature gas. Therefore, when a silicon-containing material is included as the negative electrode active material, the effect of the present disclosure becomes more pronounced.
  • a suitable silicon-containing material is a composite particle that includes an ion-conducting phase, a Si phase dispersed in the ion-conducting phase, and a conductive layer that covers the surface of the ion-conducting phase.
  • the ion-conducting phase is, for example, at least one selected from the group consisting of a silicate phase, an amorphous carbon phase, a silicide phase, and a silicon oxide phase.
  • the Si phase is formed by dispersing Si in the form of fine particles.
  • the ion-conducting phase is a continuous phase composed of a collection of particles finer than the Si phase.
  • the conductive layer is composed of a material that is more conductive than the ion-conducting phase, and forms a good conductive path in the negative electrode mixture layer 51.
  • An example of a suitable composite material containing Si is a composite particle having a sea-island structure in which fine Si particles are approximately uniformly dispersed in an amorphous silicon oxide phase, and which is generally represented by the general formula SiO x (0 ⁇ x ⁇ 2).
  • the main component of the silicon oxide may be silicon dioxide.
  • the content ratio (x) of oxygen to Si is, for example, 0.5 ⁇ x ⁇ 2.0, and preferably 0.8 ⁇ x ⁇ 1.5.
  • the binder contained in the negative electrode mixture layer 51 can be fluorine-containing resin, PAN, polyimide, acrylic resin, polyolefin, etc., but styrene butadiene rubber (SBR) is preferably used.
  • the negative electrode mixture layer 51 also preferably contains CMC or a salt thereof, polyacrylic acid (PAA) or a salt thereof, polyvinyl alcohol (PVA), etc. Among these, it is preferable to use SBR in combination with CMC or a salt thereof, PAA or a salt thereof, etc.
  • the negative electrode mixture layer 51 may also contain a conductive agent such as CNT.
  • a porous sheet having ion permeability and insulating properties is used.
  • the porous sheet include a microporous thin film, a woven fabric, and a nonwoven fabric.
  • Suitable materials for the separator 13 include polyolefins such as polyethylene and polypropylene, and cellulose.
  • the separator 13 may have a single-layer structure or a multi-layer structure.
  • a highly heat-resistant resin layer such as an aramid resin may be formed on the surface of the separator 13.
  • a filler layer containing an inorganic filler may be formed on the interface between the separator 13 and at least one of the positive electrode 11 and the negative electrode 12.
  • a positive electrode lead 17 is connected to the positive electrode 11, and a negative electrode lead 18 is connected to the winding end side of the negative electrode 12.
  • the positive electrode lead 17 passes through a through hole in the first insulating plate 15 and extends toward the sealing body 19, and the negative electrode lead 18 passes outside the second insulating plate 16 and extends toward the bottom 21 of the outer can 20.
  • the positive electrode lead 17 is connected to the underside of the internal terminal plate 24 of the sealing body 19 by welding or the like, and the sealing body 19 becomes the positive electrode terminal.
  • the negative electrode lead 18 is connected to the inner surface of the bottom 21 of the metal outer can 20 by welding or the like, and the outer can 20 becomes the negative electrode terminal.
  • the outer can 20 is a cylindrical metal container with a bottom that is open on one side in the vertical direction.
  • the outer can 20 has a bottom 21 and a side wall 22.
  • the side wall 22 is the part of the outer can 20 excluding the bottom 21, and is formed with a grooved portion 23, which will be described later.
  • a gasket 27 is provided between the exterior can 20 and the sealing body 19 to ensure sealing inside the battery and insulation between the exterior can 20 and the sealing body 19.
  • the exterior can 20 has a grooved portion 23 formed by part of the side wall portion 22 protruding inward to support the sealing body 19.
  • the grooved portion 23 is preferably formed in an annular shape along the circumferential direction of the exterior can 20, and supports the sealing body 19 on its upper surface.
  • the sealing body 19 is fixed to the top of the exterior can 20 by the grooved portion 23 and the open end of the exterior can 20 which is crimped against the sealing body 19.
  • the sealing body 19 is a disk-shaped member equipped with a safety valve.
  • the sealing body 19 has a structure in which, from the electrode body 14 side, an internal terminal plate 24, an insulating member 25, and a rupture plate 26 are stacked.
  • the internal terminal plate 24 is a metal plate including a thick outer peripheral portion 24A to which the positive electrode lead 17 is connected, and a thin central portion 24B that is cut off from the outer peripheral portion 24A when the internal pressure of the battery exceeds a predetermined threshold value.
  • a number of air vents 24C are formed in the outer peripheral portion 24A.
  • the rupture plate 26 is disposed opposite the internal terminal plate 24 with the insulating member 25 sandwiched therebetween.
  • the insulating member 25 has an opening 25A formed in the radial center, and an air vent 25B formed in the portion overlapping with the air vent 24C of the internal terminal plate 24.
  • the rupture plate 26 has a valve portion 26A that breaks when the internal pressure of the battery 10 exceeds a predetermined threshold, and the valve portion 26A is connected to the central portion 24B of the internal terminal plate 24 by welding or the like.
  • the insulating member 25 insulates the portions other than the connection portion between the central portion 24B and the valve portion 26A.
  • the outer peripheral portion surrounding the valve portion 26A of the rupture plate 26 is held between the crimp portion formed by bending the opening of the exterior can 20 inward via the gasket 27 and the grooved portion 23.
  • the valve portion 26A is formed in the radial center of the rupture plate 26, including a joint portion provided in the radial center and protruding toward the inside of the battery, and a thin portion formed around the joint portion.
  • the joint portion of the valve portion 26A passes through the opening 25A of the insulating member 25 and is joined to the center portion 24B.
  • the structure of the sealing body 19 is not limited to the structure shown in FIG. 1.
  • the sealing body 19 may have a laminated structure including two valve bodies, or may have a convex sealing body cap that covers the valve bodies.
  • the battery 10 further includes a first insulating plate 15 disposed between the electrode body 14 and the sealing body 19, a second insulating plate 16 disposed between the electrode body 14 and the bottom 21, and a spacer 28 located between the second insulating plate 16 and the bottom 21.
  • a plurality of grooves 29 are formed on the upper surface of the spacer 28, as will be described in more detail below.
  • the first insulating plate 15 prevents electrical conduction between the negative electrode 12 and the sealing body 19.
  • the shape of the first insulating plate 15 is not particularly limited, and may be the same as or different from the shape of the second insulating plate 16 described below.
  • the second insulating plate 16 prevents electrical conduction between the positive electrode 11 and the exterior can 20. Furthermore, the second insulating plate 16 plays a role in ensuring an exhaust path when gas generated inside the battery is exhausted to the outside via a safety valve.
  • the second insulating plate 16 has a disk shape.
  • the diameter of the second insulating plate 16 is, for example, slightly smaller than the diameter of the inner surface of the bottom 21. Note that the second insulating plate 16 is not limited to a disk shape, and the outer periphery of the second insulating plate 16 may have a polygonal shape. Also, a notch may be formed in part of the outer periphery of the second insulating plate 16.
  • the second insulating plate 16 has an opening.
  • the opening ratio which is the ratio of the area of the opening to the total area of the second insulating plate 16, is preferably 10% or more, and more preferably 15% or more. In this case, it is easy to ensure an exhaust path when high-temperature gas generated inside the battery is exhausted to the outside of the battery.
  • the opening ratio of the second insulating plate 16 is preferably 50% or less, and more preferably 40% or less. In this case, the strength of the second insulating plate 16 is ensured, and deformation and breakage of the second insulating plate 16 due to expansion of the electrode body 14 accompanying charging and discharging can be suppressed. Therefore, an example of a suitable range of the opening ratio of the second insulating plate 16 is 10% or more and 50% or less, and more preferably 15% or more and 40% or less.
  • the thickness of the second insulating plate 16 may be, for example, 0.1 mm or more and 1.0 mm or less. By making the thickness of the second insulating plate 16 0.1 mm or more, deformation of the second insulating plate 16 can be suppressed, and high-temperature gas in the lower part of the battery can be smoothly exhausted. By making the thickness of the second insulating plate 16 1.0 mm or less, stress concentration on the electrode body 14 due to steps in the second insulating plate 16 can be suppressed, and high-temperature gas in the lower part of the battery can be smoothly exhausted.
  • the thickness of the second insulating plate 16 is preferably 50% or more and 500% or less of the depth of the groove 29 formed in the spacer 28 described later, and more preferably 150% or more and 400% or less.
  • the Young's modulus of the second insulating plate 16 at 25°C is preferably 10 GPa or more, and preferably 20 GPa or more.
  • the upper limit of the Young's modulus of the second insulating plate 16 at 25°C is, for example, 200 GPa.
  • the Young's modulus is measured by a compression method (for example, a Tensilon universal material testing machine manufactured by Orientec) at a temperature condition of 25°C.
  • a sample for measuring the Young's modulus may be prepared by cutting the second insulating plate 16 to a specified dimension, or may be prepared separately using the same material as the constituent material of the second insulating plate 16.
  • the material of the second insulating plate 16 is not particularly limited, but is preferably a resin, such as polypropylene (PP), polyethylene (PE), or nylon (PA).
  • PP polypropylene
  • PE polyethylene
  • PA nylon
  • the second insulating plate 16 shown in Fig. 2 has a first opening 16A formed in a range including the center ⁇ of the second insulating plate 16, and no openings other than the first opening 16A are formed.
  • the first opening 16A has a substantially perfect circular shape.
  • the diameter D16A of the first opening 16A is, for example, 20% of the diameter D16 of the second insulating plate 16.
  • the first opening 16A may have, for example, a substantially polygonal shape.
  • the first opening 16A is formed in a range including the center ⁇ of the second insulating plate 16, for example, one in the center of the second insulating plate 16.
  • the first opening 16A is a passage for high-temperature gas and is also used as a hole for passing a welding rod when welding the negative electrode lead 18 to the inner surface of the bottom 21.
  • the center of the first opening 16A coincides with the center of the second insulating plate 16.
  • the second insulating plate 16 shown in FIG. 3 has a first opening 16A formed in a range including the center ⁇ of the second insulating plate 16, and multiple second openings 16B formed around the first opening 16A.
  • the second insulating plate 16 has six second openings 16B with a smaller diameter than the first openings 16A.
  • the number of second openings 16B is not particularly limited and may be less than six.
  • the second openings 16B may be formed randomly around the first opening 16A, but from the viewpoint of increasing the strength of the second insulating plate 16 and improving the flow of high-temperature gas, it is preferable to form them at equal intervals in a single concentric circle centered on the first opening 16A.
  • six second openings 16B having the same shape and dimensions are formed on an imaginary circle ⁇ centered on the center ⁇ of the second insulating plate 16.
  • the first openings 16A and the second openings 16B have an approximately perfect circular shape, but are not limited to this.
  • the first openings 16A and the second openings 16B may have, for example, an approximately polygonal shape.
  • the second insulating plate 16 shown in Fig. 4 has a first opening 16A formed in a range including the center ⁇ of the second insulating plate 16, and a plurality of elongated third openings 16C formed radially outward from the center of the first opening 16A.
  • first opening 16A formed in a range including the center ⁇ of the second insulating plate 16, and a plurality of elongated third openings 16C formed radially outward from the center of the first opening 16A.
  • six third openings 16C are formed in the second insulating plate 16.
  • the number of third openings 16C is not particularly limited and may be less than six.
  • the width W 16C of the third openings 16C is not particularly limited, but is, for example, 5% or more and 20% or less of the diameter D 16A of the first opening 16A.
  • Figure 5 is a plan view showing the top side of the spacer 28, and Figure 6 is an enlarged perspective view showing the grooves formed on the top side of the spacer 28. Note that in Figure 5, the area where the grooves 29 are formed is shown with dot hatching.
  • the spacer 28 is disposed between the second insulating plate 16 and the bottom 21.
  • the spacer 28 is disposed so as to sandwich the negative electrode lead 18 with the bottom 21, but it may be disposed below the negative electrode lead 18.
  • the negative electrode lead 18 is welded to the spacer 28.
  • the spacer 28 and the bottom 21 are not fixed to each other, but the lower surface of the spacer 28 and the bottom 21 may be fixed to each other by adhesion, welding, etc.
  • the spacer 28 may be made of a resin such as polypropylene (PP) or polyethylene (PE), but from the standpoint of ensuring the strength of the spacer 28, it is preferable to make it of a metal such as aluminum or stainless steel.
  • PP polypropylene
  • PE polyethylene
  • the spacer 28 has a disk shape.
  • the diameter of the spacer 28 is, for example, slightly smaller than the diameter of the inner surface of the bottom 21.
  • the spacer 28 is not limited to a disk shape, and the outer periphery of the spacer 28 may have a polygonal shape. Also, a notch may be formed in part of the outer periphery of the spacer 28.
  • One opening 28A is formed at the center ⁇ of the spacer 28.
  • the opening 28A is used as a hole through which a welding rod passes when welding the negative electrode lead 18 to the inner surface of the bottom 21.
  • the center of the opening 28A coincides with the center ⁇ of the spacer 28.
  • the number of openings 28A formed in the spacer 28 is not limited to one, and two or more openings may be formed.
  • the spacer 28 does not need to have an opening 28A formed therein.
  • the size of the opening 28A is not particularly limited, and for example, the diameter of the opening 28A is 30% of the diameter of the spacer 28.
  • the shape of the opening 28A is substantially the same as the first opening 16A formed in the second insulating plate 16.
  • the thickness of the spacer 28 is preferably 0.3 mm or more, and more preferably 0.5 mm or more. In this case, the strength of the spacer 28 is ensured, and deformation and breakage of the spacer 28 due to expansion of the electrode body 14 accompanying charging and discharging can be suppressed. Furthermore, the thickness of the spacer 28 is preferably 2.5 mm or less, and more preferably 2.0 mm or less. In this case, a decrease in battery capacity due to a decrease in the volume of the electrode body 14 can be suppressed. Thus, an example of a suitable range for the thickness of the spacer 28 is 0.3 mm or more and 2.5 mm or less, and more preferably 0.5 mm or more and 2.0 mm or less.
  • a plurality of grooves extending in one direction are arranged on the upper surface of the spacer 28 at intervals in another direction perpendicular to the one direction.
  • the grooves 29 are preferably disposed at equal intervals from each other in the other direction perpendicular to the one extending direction. In this case, high-temperature gas can be more smoothly exhausted to the outside of the battery, and stress acting on the electrode body 14 is more easily dispersed when the electrode body 14 expands in the vertical direction.
  • the interval L 29 of the grooves 29 is not particularly limited, but is, for example, 30% or more and 120% or less of the width W 29 of the grooves 29.
  • An example of the interval L 29 of the grooves 29 is 0.4 mm or more and 1.2 mm or less.
  • the grooves 29 may be arranged in only a partial area of the top surface of the spacer 28 in a plan view, but from the viewpoint of achieving the most significant effects of the present disclosure, it is preferable that the grooves 29 be arranged over the entire top surface of the spacer 28.
  • the total area of the grooves 29 is preferably 30% or more, and more preferably 40% or more, of the area of the inner surface of the bottom 21 in a plan view. In this case, the stress acting on the electrode body 14 is more dispersed when the electrode body 14 expands in the vertical direction.
  • the total area of the grooves 29 is preferably 70% or less, and more preferably 60% or less, of the area of the inner surface of the bottom 21. In this case, it becomes easier to ensure an exhaust path for high-temperature gas, and high-temperature gas inside the battery can be exhausted more smoothly. Therefore, an example of a suitable range for the total area of the grooves 29 is 30% or more and 70% or less of the area of the inner surface of the bottom 21, and more preferably 40% or more and 60% or less of the area of the inner surface of the bottom 21.
  • the number of protrusions 30 between adjacent grooves 29 is preferably 5 or more, and more preferably 10 or more, per 1 cm in the other direction perpendicular to the one direction in a plan view. In this case, it is easier to ensure an exhaust path for high-temperature gas, and high-temperature gas inside the battery can be exhausted more smoothly.
  • the number of protrusions 30 is preferably 25 or less, and more preferably 20 or less, per 1 cm in the other direction. In this case, when the electrode body 14 expands in the vertical direction, the stress applied to the electrode body 14 is more easily dispersed. Therefore, an example of a suitable range for the number of protrusions 30 per cm in the other direction is 5 or more and 25 or less, and more preferably 10 or more and 20 or less.
  • the width of the groove 29 is approximately constant throughout the depth direction of the groove 29.
  • the side surface 32 of the groove 29 is formed perpendicular to the surface of the spacer 28. Note that the shape of the groove 29 is not limited to this, and the side surface 32 may be inclined so that the width of the groove 29 narrows toward the bottom in the depth direction.
  • the depth of the groove 29 is uniform across the surface, but is not limited to this.
  • the groove 29 may be made deeper as it approaches the center ⁇ of the spacer 28 (see FIG. 5).
  • the electrode body 14 tends to expand more at the start of the winding than at the end of the winding. Therefore, by making the groove 29 deeper as it approaches the center ⁇ of the spacer 28, gaps are more likely to form at the start of the winding of the electrode body 14, allowing high-temperature gas inside the battery 10 to be exhausted smoothly.
  • the depth of the groove 29 is preferably 0.2 mm or more, and more preferably 0.3 mm or more. In this case, it becomes easier to secure an exhaust path for high-temperature gas, and the high-temperature gas inside the battery can be exhausted more smoothly.
  • the depth of the groove 29 is preferably 0.7 mm or less, and more preferably 0.6 mm or less. In this case, it is possible to suppress a decrease in battery capacity due to a decrease in the volume of the electrode body 14. Therefore, an example of a suitable range for the depth of the groove 29 is 0.2 mm or more and 0.7 mm or less, and more preferably 0.3 mm or more and 0.6 mm or less.
  • FIG. 7 is a cross-sectional view of a nonaqueous electrolyte secondary battery 10X, which is another example of an embodiment. Note that the same components as those of the nonaqueous electrolyte secondary battery 10 are given the same reference numbers as those of the nonaqueous electrolyte secondary battery 10, and descriptions thereof will be omitted.
  • the nonaqueous electrolyte secondary battery 10X differs from the nonaqueous electrolyte secondary battery 10 in that a spacer 28 is not provided. Furthermore, in the nonaqueous electrolyte secondary battery 10X, a plurality of grooves 29 are formed on the inner surface of the bottom 21 of the outer can 20. By forming the grooves 29 on the bottom 21 without providing the spacer 28, it is possible to achieve the effects of the present disclosure while suppressing increases in manufacturing costs.
  • the depth of the groove 29 is preferably 60% or less of the thickness of the bottom 21, and more preferably 50% or less.
  • FIG. 8 is a cross-sectional view of a nonaqueous electrolyte secondary battery 10Y, which is another example of an embodiment. Note that the same components as those of the nonaqueous electrolyte secondary battery 10 are given the same reference numbers as those of the nonaqueous electrolyte secondary battery 10, and descriptions thereof will be omitted.
  • nonaqueous electrolyte secondary battery 10Y differs from nonaqueous electrolyte secondary battery 10 in that spacers 28 are not provided. Furthermore, nonaqueous electrolyte secondary battery 10Y has multiple grooves 29 formed in the lower surface of second insulating plate 16. By forming grooves 29 in second insulating plate 16 without providing spacers 28, it is possible to achieve the effects of the present disclosure while suppressing increases in manufacturing costs, similar to nonaqueous electrolyte secondary battery 10X.
  • the depth of the groove 29 is preferably 60% or less of the thickness of the second insulating plate 16, and more preferably 50% or less.
  • Example 1 [Preparation of Positive Electrode]
  • Aluminum-containing lithium nickel cobalt oxide (LiNi 0.88 Co 0.09 Al 0.03 O 2 ) was used as the positive electrode active material.
  • 100 parts by mass of LiNi 0.88 Co 0.09 Al 0.03 O 2 as the positive electrode active material, 1.0 parts by mass of acetylene black as a conductive agent, and 0.9 parts by mass of polyvinylidene fluoride (PVDF) as a binder were mixed in a dispersion medium of N-methylpyrrolidone (NMP) to prepare a positive electrode mixture slurry.
  • NMP N-methylpyrrolidone
  • the prepared positive electrode mixture slurry was uniformly applied to both sides of a positive electrode core of aluminum foil having a thickness of 15 ⁇ m.
  • the NMP was removed in a dryer at a temperature of 100 to 150 ° C., and then compressed by a roll press to prepare a positive electrode plate.
  • Graphite powder was mixed to 70 parts by mass and Si oxide was mixed to 30 parts by mass. 100 parts by mass of the negative electrode active material, 1 part by mass of CMC as a thickener, and 1 part by mass of styrene butadiene rubber as a binder were mixed in water to prepare a negative electrode mixture slurry.
  • the negative electrode mixture slurry was applied to both sides of a negative electrode core of copper foil having a thickness of 8 ⁇ m to form a negative electrode mixture layer. Next, after drying, the negative electrode was compressed with a compression roller so that the negative electrode thickness was 0.160 mm to prepare a negative electrode.
  • a non-aqueous electrolyte was prepared by dissolving LiPF6 at a concentration of 1.2 mol/L in a mixed solvent of ethylene carbonate (EC), ethyl methyl carbonate (EMC), and dimethyl carbonate (DMC) in a volume ratio of 3:3:4 (25° C.).
  • EC ethylene carbonate
  • EMC ethyl methyl carbonate
  • DMC dimethyl carbonate
  • a spacer made of nickel steel and having a plurality of grooves was accommodated in a cylindrical outer can with a bottom surface of 21 mm in diameter, and then an insulating plate, an electrode body, and a non-aqueous electrolyte were accommodated in the outer can.
  • the outer can was then spun to form a grooved portion.
  • An internal terminal plate was placed on the grooved portion via a gasket, and a positive electrode lead was ultrasonically welded to the upper surface of the internal terminal plate. After that, degassing was performed under reduced pressure, and a rupture plate was placed on the internal terminal plate, and the rupture plate and the internal terminal plate were welded. Finally, a non-aqueous electrolyte secondary battery was obtained by crimping the upper end of the outer can.
  • the internal terminal plate, the rupture plate, and the gasket constitute a sealing body including a safety valve as shown in FIG. 1.
  • the spacer has grooves formed over the entire upper surface thereof in the manner shown in Figs. Diameter: 18 mm, thickness: 0.4 mm Groove depth: 0.2 mm Groove area: 30% of the inner surface area of the bottom of the outer can
  • the details of the insulating plate (second insulating plate) provided between the electrode body and the bottom of the exterior can are as follows:
  • the insulating plate has an opening as shown in FIG. Diameter: 28 mm, thickness: 0.2 mm
  • Shape of opening An opening with a diameter of 5 mm is formed in the center of the insulating plate.
  • Example 2 A nonaqueous electrolyte secondary battery was fabricated in the same manner as in Example 1, except that the spacer was changed to the following spacer. Diameter: 18 mm, thickness: 0.4 mm Groove area: 0.2 mm Groove area: 70% of the inner surface area of the bottom of the outer can
  • Comparative Example A nonaqueous electrolyte secondary battery was fabricated in the same manner as in Example 1, except that no spacer was provided in the fabrication of the nonaqueous electrolyte secondary battery.
  • each charged battery was placed inside a copper tube equipped with a heater, and the heater was turned on to ignite the battery. After ignition, the batteries were visually inspected to see if the side of the can had burst. The results are shown in Table 1.
  • a nonaqueous electrolyte secondary battery comprising: an electrode assembly in which a positive electrode and a negative electrode are wound with a separator interposed therebetween; a bottomed cylindrical outer can containing the electrode assembly; a sealing body that closes an opening of the outer can; an insulating plate located between the electrode assembly and a bottom of the outer can; and a spacer located between the insulating plate and the bottom of the outer can, wherein the sealing body has a safety valve that releases internal pressure when the internal pressure of the outer can rises to or exceeds a predetermined level, and the spacer has a plurality of grooves extending in one direction on at least one of the surfaces facing the insulating plate, and the plurality of grooves are arranged at intervals from one another in another direction perpendicular to the one direction.
  • a nonaqueous electrolyte secondary battery comprising: an electrode assembly in which a positive electrode and a negative electrode are wound with a separator interposed therebetween; a bottomed, cylindrical outer can containing the electrode assembly; a sealing body that closes an opening of the outer can; and an insulating plate located between the electrode assembly and the bottom of the outer can, the sealing body having a safety valve that releases internal pressure when the internal pressure of the outer can rises to or exceeds a predetermined level, and at least one of a surface of the insulating plate facing the bottom of the outer can and an inner surface of the bottom of the outer can has a plurality of grooves extending in one direction, and the plurality of grooves are arranged at intervals from one another in another direction perpendicular to the one direction.
  • Configuration 3 The nonaqueous electrolyte secondary battery according to configuration 1 or 2, wherein the depth of the plurality of grooves is 0.2 mm or more and 0.7 mm or less.
  • Configuration 4 The nonaqueous electrolyte secondary battery according to any one of Configurations 1 to 3, wherein a total area of the plurality of grooves is 30% or more and 70% or less of an area of the inner surface of the bottom of the exterior can when viewed in a plan view looking down on the plurality of grooves from above.
  • Configuration 5 The nonaqueous electrolyte secondary battery according to any one of configurations 1 to 4, wherein, when the grooves are viewed in a plan view from above, the number of protrusions between adjacent grooves is 5 to 25 per cm in the other direction.
  • Configuration 6 The nonaqueous electrolyte secondary battery according to any one of configurations 1 to 5, wherein the plurality of grooves are disposed at equal intervals from one another in the other direction.
  • Configuration 7 The nonaqueous electrolyte secondary battery according to any one of configurations 1 to 6, wherein the insulating plate has a thickness of 0.1 mm or more and 1.0 mm or less.
  • Configuration 8 The nonaqueous electrolyte secondary battery according to any one of Configurations 1 to 7, wherein the insulating plate has openings, and an opening ratio, which is a ratio of an area of the openings to a total area of the insulating plate, is 10% or more and 50% or less.
  • Configuration 9 The nonaqueous electrolyte secondary battery according to configuration 9, wherein the openings include a first opening formed in an area including a center of the insulating plate, and a plurality of second openings formed around the first opening.
  • Configuration 10 The nonaqueous electrolyte secondary battery according to configuration 9, wherein the second openings are formed at equal intervals in a single concentric circle centered on the first opening.
  • Configuration 11 The nonaqueous electrolyte secondary battery according to configuration 8, wherein the openings include a first opening formed in an area including a center of the insulating plate, and a plurality of third openings formed radially from the center of the first opening.
  • Configuration 12 The nonaqueous electrolyte secondary battery according to any one of Configurations 1 to 11, wherein the negative electrode includes a negative electrode core and a negative electrode mixture layer formed on the negative electrode core, and the negative electrode mixture layer includes a silicon-containing material as a negative electrode active material.
  • Aspect 13 The nonaqueous electrolyte secondary battery according to aspect 12, wherein the content of the silicon-containing material is 10 mass% or more of the total mass of the negative electrode active material.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
PCT/JP2024/000641 2023-01-30 2024-01-12 非水電解質二次電池 Ceased WO2024161950A1 (ja)

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EP24749905.6A EP4661146A1 (en) 2023-01-30 2024-01-12 Nonaqueous electrolyte secondary battery
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10284046A (ja) * 1997-04-08 1998-10-23 Matsushita Electric Ind Co Ltd 非水電解液二次電池
JP2001057245A (ja) 1999-08-18 2001-02-27 Nec Corp 非水電解液二次電池
JP2004111105A (ja) * 2002-09-13 2004-04-08 Sony Corp 非水電解液電池
US20070154789A1 (en) * 2005-12-29 2007-07-05 Chang Seok-Gyun Lithium ion rechargeable battery
JP2011003527A (ja) * 2009-06-16 2011-01-06 Samsung Sdi Co Ltd 二次電池
JP2014072050A (ja) * 2012-09-28 2014-04-21 Sanyo Electric Co Ltd 非水電解質二次電池
JP2022521195A (ja) * 2019-03-20 2022-04-06 エルジー エナジー ソリューション リミテッド 二次電池用絶縁板及びその絶縁板を含む二次電池

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10284046A (ja) * 1997-04-08 1998-10-23 Matsushita Electric Ind Co Ltd 非水電解液二次電池
JP2001057245A (ja) 1999-08-18 2001-02-27 Nec Corp 非水電解液二次電池
JP2004111105A (ja) * 2002-09-13 2004-04-08 Sony Corp 非水電解液電池
JP4321027B2 (ja) 2002-09-13 2009-08-26 ソニー株式会社 非水電解液電池
US20070154789A1 (en) * 2005-12-29 2007-07-05 Chang Seok-Gyun Lithium ion rechargeable battery
JP2011003527A (ja) * 2009-06-16 2011-01-06 Samsung Sdi Co Ltd 二次電池
JP2014072050A (ja) * 2012-09-28 2014-04-21 Sanyo Electric Co Ltd 非水電解質二次電池
JP2022521195A (ja) * 2019-03-20 2022-04-06 エルジー エナジー ソリューション リミテッド 二次電池用絶縁板及びその絶縁板を含む二次電池

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4661146A1

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