WO2023106099A1 - Batterie - Google Patents

Batterie Download PDF

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Publication number
WO2023106099A1
WO2023106099A1 PCT/JP2022/043280 JP2022043280W WO2023106099A1 WO 2023106099 A1 WO2023106099 A1 WO 2023106099A1 JP 2022043280 W JP2022043280 W JP 2022043280W WO 2023106099 A1 WO2023106099 A1 WO 2023106099A1
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WO
WIPO (PCT)
Prior art keywords
negative electrode
positive electrode
insulator
exterior body
length
Prior art date
Application number
PCT/JP2022/043280
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English (en)
Japanese (ja)
Inventor
真也 渡辺
恒司 西下
幸子 平林
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Tdk株式会社
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Filing date
Publication date
Application filed by Tdk株式会社 filed Critical Tdk株式会社
Publication of WO2023106099A1 publication Critical patent/WO2023106099A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—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
    • 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
    • H01M50/109—Primary casings; Jackets or wrappings characterised by their shape or physical structure of button or coin 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/153—Lids or covers characterised by their shape for button or coin 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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
    • H01M50/543—Terminals
    • H01M50/545—Terminals formed by the casing of 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • 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
    • H01M50/543—Terminals
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/567—Terminals characterised by their manufacturing process by fixing means, e.g. screws, rivets or bolts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H01M6/02—Details
    • 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

Definitions

  • the present invention relates to batteries. This application claims priority based on Japanese Patent Application No. 2021-197911 filed in Japan on December 6, 2021, the contents of which are incorporated herein.
  • Batteries are also widely used as power sources for mobile devices such as mobile phones and laptop computers, and hybrid cars.
  • Patent Document 1 Coin-type or button-type batteries (for example, Patent Document 1) are used in various devices such as watches and earphones.
  • Patent Literature 1 describes a coin-type battery in which a roll core is arranged at the center of a wound body.
  • the positive terminal and negative terminal are welded to the outer can to obtain electrical connection with the outside. If there is a gap between the positive electrode terminal or the negative electrode terminal and the outer can, welding defects may occur during welding, resulting in insufficient connection therebetween.
  • the present disclosure has been made in view of the above problems, and aims to provide a battery that can reduce poor contact.
  • a battery includes a power generation element including a positive electrode to which a positive electrode terminal is connected, a negative electrode to which a negative electrode terminal is connected, and a separator sandwiched between the positive electrode and the negative electrode;
  • An insulator that penetrates the power generation element in the first direction, and a first exterior body and a second exterior body that sandwich the power generation element in the first direction are provided.
  • the length of the insulator in the first direction is greater than or equal to the length of the negative electrode in the first direction. The insulator presses the positive electrode terminal against the first exterior body and presses the negative electrode terminal against the second exterior body.
  • the insulator may be a cylinder having an upper surface and a lower surface at both ends in the first direction.
  • the insulator may have therein a space extending in the first direction.
  • the length of the insulator in the first direction may be greater than the length of the negative electrode in the first direction.
  • the wound body may have the insulator at the center of the axis.
  • the insulator may contain a resin having a tensile elastic modulus of 3000 MPa or more.
  • a battery according to a second aspect includes a power generation element including a positive electrode to which a positive electrode terminal is connected, a negative electrode to which a negative electrode terminal is connected, and a separator sandwiched between the positive electrode and the negative electrode;
  • An insulator that penetrates the power generation element in the first direction, and a first exterior body and a second exterior body that sandwich the power generation element in the first direction are provided.
  • the length of the insulator in the first direction is equal to or greater than the length of the power generation element in the first direction. The insulator presses the positive electrode terminal against the first exterior body and presses the negative electrode terminal against the second exterior body.
  • the battery according to the above aspect can reduce poor contact.
  • FIG. 1 is a cross-sectional view of a battery according to a first embodiment
  • FIG. 3 is an exploded view of the power generation element of the battery according to the first embodiment
  • FIG. FIG. 5 is a cross-sectional view of a battery according to a first modified example
  • FIG. 4 is a cross-sectional view of a battery according to a second embodiment
  • FIG. 11 is a cross-sectional view of a battery according to a second modified example
  • the direction in which the insulator 20 or the insulator 21 penetrates any one of the power generation element 10, the power generation element 11, and the power generation element 12 is defined as the z direction.
  • An arbitrary direction of a plane orthogonal to the z-direction is defined as the x-direction, and a direction orthogonal to the x-direction and the z-direction is defined as the y-direction.
  • the z-direction is an example of a first direction.
  • the +z direction is sometimes expressed as “up” and the ⁇ z direction as “down”. Up and down do not necessarily match the direction in which gravity is applied.
  • FIG. 1 is a cross-sectional view of the battery according to the first embodiment.
  • FIG. 1 is a cross section cut along a line segment passing through the center of the top and bottom surfaces of the coin cell.
  • a battery 100 includes a power generating element 10 , an insulator 20 and an exterior body 30 .
  • the shape of the battery 100 is, for example, coin-shaped or button-shaped.
  • the type of the battery 100 does not matter, but the battery 100 is, for example, a lithium ion secondary battery, a magnesium ion secondary battery, a nickel hydrogen battery, a nickel cadmium battery, or an all-solid battery.
  • a power generation element 10 includes a positive electrode 1 , a negative electrode 2 and a separator 3 .
  • a positive electrode terminal 4 is connected to the positive electrode 1 and a negative electrode terminal 5 is connected to the negative electrode 2 .
  • At least a part of the positive electrode 1, the negative electrode 2 and the separator 3 may be covered with an insulating tape 6 or the like.
  • the insulating tape 6 is, for example, a polyimide tape.
  • FIG. 2 is an exploded view of the power generation element 10.
  • the power generation element 10 is, for example, a wound body.
  • the wound body is obtained by winding a positive electrode 1, a separator 3, a negative electrode 2, and a separator 3 as one unit.
  • the power generating element 10 is obtained by stacking the positive electrode 1, the separator 3, the negative electrode 2, and the separator 3 in this order and winding them around the left end.
  • the length L1 of the positive electrode 1, the length L2 of the negative electrode 2, and the length L3 of the separator 3 may be different.
  • the lengths L1, L2, and L3 are the widths of the deployable body and the height of the power generating element 10 in the z direction.
  • the length L3 of the separator 3 is often longer than the length L1 of the positive electrode 1 and the length L2 of the negative electrode 2 to prevent short circuits.
  • the length L2 of the negative electrode 2 is often longer than the length L1 of the positive electrode 1 .
  • the height of the power generation element 10 in the z direction substantially matches the length L2 of the negative electrode 2 .
  • the separator 3 often wrinkles or shrinks, and even if the length L3 of the separator 3 is greater than the length L2 of the negative electrode 2, it is difficult to define the length L3 of the separator 3 in the wound state. .
  • the positive electrode 1 has, for example, a positive electrode current collector 1A and a positive electrode active material layer 1B.
  • the positive electrode active material layer 1B is present on at least one surface of the positive electrode current collector 1A.
  • the positive electrode active material layer 1B is formed, for example, on both sides of the positive electrode current collector 1A.
  • the positive electrode current collector 1A is, for example, a conductive plate.
  • the positive electrode current collector 1A is, for example, a metal thin plate of aluminum, copper, nickel, titanium, stainless steel, or the like. Aluminum, which is light in weight, is suitably used for the positive electrode current collector 1A.
  • the average thickness of the positive electrode current collector 1A is, for example, 10 ⁇ m or more and 30 ⁇ m or less.
  • a positive electrode terminal 4 is connected to the positive electrode current collector 1A.
  • the positive electrode terminal 4 is connected to one end of the positive electrode current collector 1A, for example.
  • the positive electrode terminal 4 contains conductive materials, such as aluminum, nickel, and copper, for example.
  • the positive electrode terminal 4 is connected to the positive electrode current collector 1A by welding, screwing, or the like, for example. In order to prevent a short circuit, the surface of the positive electrode terminal 4 may be protected with an insulating tape.
  • the positive electrode terminal 4 extends, for example, on the first surface of the power generation element 10 in the z direction. A portion of the positive electrode terminal 4 is sandwiched between the insulator 20 and the first exterior body 31 .
  • the positive electrode active material layer 1B contains, for example, a positive electrode active material.
  • the positive electrode active material layer 1B may contain a conductive aid and a binder as needed.
  • the positive electrode active material includes an electrode active material capable of reversibly occluding and releasing cations, desorbing and inserting cations (intercalation), or doping and dedoping cations and counteranions.
  • Cations are, for example, lithium ions and magnesium ions.
  • the positive electrode active material is, for example, a composite metal oxide.
  • the positive electrode active material may be a cation-free material.
  • Cation-free materials are, for example, FeF 3 , conjugated polymers containing organic conductive materials, Chevrell phase compounds, transition metal chalcogenides, vanadium oxides, niobium oxides, and the like.
  • the cation-free material may be used alone or in combination.
  • discharge is first performed. Cations are inserted into the positive electrode active material by discharging.
  • cations may be chemically or electrochemically pre-doped into a cation-free material for the positive electrode active material.
  • the conductive aid enhances the electronic conductivity between the positive electrode active materials.
  • conductive aids include carbon powder, carbon nanotubes, carbon materials, metal fine powders, mixtures of carbon materials and metal fine powders, and conductive oxides.
  • carbon powder include carbon black, acetylene black, and ketjen black.
  • Metal fine powder is, for example, powder of copper, nickel, stainless steel, iron, or the like.
  • the binder in the positive electrode active material layer 1B binds the positive electrode active materials together.
  • a known binder can be used.
  • the binder is preferably insoluble in the electrolytic solution, has oxidation resistance, and has adhesiveness.
  • the binder is, for example, fluororesin.
  • Binders include, for example, polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyamide (PA), polyimide (PI), polyamideimide (PAI), polybenzimidazole (PBI), polyethersulfone (PES), Polyacrylic acid and its copolymers, metal ion crosslinked polyacrylic acid and its copolymers, maleic anhydride-grafted polypropylene (PP) or polyethylene (PE), and mixtures thereof. PVDF is particularly preferable as the binder used for the positive electrode active material layer 1B.
  • the negative electrode 2 has, for example, a negative electrode current collector 2A and a negative electrode active material layer 2B.
  • the negative electrode active material layer 2B is present on at least one surface of the negative electrode current collector 2A.
  • the negative electrode active material layer 2B is formed, for example, on both sides of the negative electrode current collector 2A.
  • the negative electrode current collector 2A is, for example, a conductive plate.
  • the negative electrode current collector 2A can be the same as the positive electrode current collector 1A.
  • a negative electrode terminal 5 is connected to the negative electrode current collector 2A.
  • the negative electrode terminal 5 is connected to one end of the negative electrode current collector 2A, for example.
  • the negative electrode terminal 5 contains, for example, a conductive material such as aluminum, nickel, or copper.
  • the negative electrode terminal 5 is connected to the negative electrode current collector 2A by welding, screwing, or the like, for example.
  • the surface of the negative terminal 5 may be protected with an insulating tape.
  • the negative terminal 5 extends, for example, on the second surface of the power generating element 10 in the z direction. The second surface is the surface opposite to the surface where the positive electrode terminal 4 is exposed. A portion of the negative electrode terminal 5 is sandwiched between the insulator 20 and the second exterior body 32 .
  • the negative electrode active material layer 2B contains, for example, a negative electrode active material.
  • the negative electrode active material layer 2B may contain a conductive aid and a binder as needed.
  • the negative electrode active material may be any compound that can occlude and release ions, and known negative electrode active materials can be used.
  • the negative electrode active material is, for example, metallic lithium, metallic magnesium, lithium alloys, magnesium alloys, carbon materials, and substances that can be alloyed with cations.
  • Carbon materials include, for example, graphite that can occlude and release ions (natural graphite, artificial graphite), carbon nanotubes, non-graphitizable carbon, easily graphitizable carbon, low-temperature fired carbon, and the like.
  • Materials that can be alloyed with cations include, for example, silicon, tin, zinc, lead, and antimony. Substances that can be alloyed with cations may be, for example, these elemental metals, or alloys or oxides containing these elements.
  • the same conductive aid and binder as those of the positive electrode 1 can be used.
  • the binder in the negative electrode 2 may be, for example, cellulose, styrene/butadiene rubber, ethylene/propylene rubber, polyimide resin, polyamideimide resin, acrylic resin, etc., in addition to those listed for the positive electrode 1 .
  • the cellulose may be, for example, carboxymethylcellulose (CMC).
  • a separator 3 is sandwiched between the positive electrode 1 and the negative electrode 2 .
  • the separator 3 separates the positive electrode 1 and the negative electrode 2 and prevents a short circuit between the positive electrode 1 and the negative electrode 2 .
  • the separator 3 extends in-plane along the positive electrode 1 and the negative electrode 2 . Cations can pass through the separator 3 .
  • the separator 3 is, for example, a porous film having an electrically insulating porous structure.
  • the separator 3 is, for example, a monolayer or laminate of polyolefin films.
  • the separator 3 may be a stretched film of a mixture of polyethylene, polypropylene, or the like.
  • the separator 3 may be a fibrous nonwoven fabric made of at least one constituent material selected from the group consisting of cellulose, polyester, polyacrylonitrile, polyamide, polyethylene and polypropylene.
  • Separator 3 may be, for example, a solid electrolyte.
  • Solid electrolytes are polymer solid electrolytes, oxide-based solid electrolytes, and sulfide-based solid electrolytes, for example.
  • the separator 3 may be an inorganic coated separator.
  • the inorganic coated separator is obtained by coating the surface of the above film with a mixture of a resin such as PVDF or CMC and an inorganic material such as alumina or silica.
  • the inorganic coated separator has excellent heat resistance and suppresses deposition of transition metals eluted from the positive electrode onto the surface of the negative electrode.
  • the power generating element 10 is impregnated with the electrolytic solution.
  • the electrolyte is impregnated in the cathode active material layer 1B and the anode active material layer 2B.
  • the electrolyte varies depending on the type of battery, a known electrolyte can be used. If the battery 100 is an all-solid battery, no electrolytic solution is required.
  • the electrolyte contains a non-aqueous solvent and an electrolyte salt.
  • the electrolyte salt is, for example, a lithium salt.
  • the electrolyte salt is, for example, LiPF 6 , lithium borofluoride (LiBF 4 ), LiClO 4 , LiCF 3 SO 3 , LiCF 3 CF 2 SO 3 , LiC(CF 3 SO 2 ) 3 , LiN(SO 2 F) 2 , LiN ( CF3SO2 ) 2 , LiN( CF3CF2SO2 ) 2 , LiN( CF3SO2 ) ( C4F9SO2 ) , LiN ( CF3CF2CO ) 2 , LiBOB , LiN(FSO 2 ) 2nd prize.
  • the non-aqueous solvent contains, for example, a cyclic carbonate and a chain carbonate.
  • Cyclic carbonates solvate electrolytes. Cyclic carbonates are, for example, ethylene carbonate, propylene carbonate and butylene carbonate.
  • the cyclic carbonate preferably contains at least propylene carbonate.
  • Chain carbonates reduce the viscosity of cyclic carbonates. Chain carbonates are, for example, diethyl carbonate, dimethyl carbonate, ethylmethyl carbonate.
  • Non-aqueous solvents may also include methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, propyl propionate, ⁇ -butyrolactone, 1,2-dimethoxyethane, 1,2-diethoxyethane, and the like.
  • the insulator 20 penetrates the power generating element 10 in the z direction.
  • the insulator 20 is a columnar body.
  • the insulator 20 is, for example, a cylinder having an upper surface and a lower surface at both ends in the z direction.
  • the insulator 20 is at the center of the axis of the power generating element 10 to be wound.
  • the length L20 of the insulator 20 in the z direction is, for example, equal to or greater than the length L2 of the negative electrode 2 in the z direction.
  • the length L20 of the insulator 20 in the z direction is preferably longer than the length L2 of the negative electrode 2 in the z direction, more preferably 1.04 times or more the length L2 of the negative electrode 2 in the z direction.
  • the length L20 of the insulator 20 in the z direction is preferably 1.08 times or less the length L2 of the negative electrode 2 in the z direction.
  • the length L20 of the insulator 20 in the z direction is, for example, preferably longer than the length L2 of the negative electrode 2 in the z direction by 2 mm or more, and preferably 4 mm or less than the length L2 of the negative electrode 2 in the z direction.
  • the insulator 20 protrudes from each of the upper and lower surfaces of the power generation element 10 in the z direction.
  • the upper end of the insulator 20 protrudes from the upper surface of the power generation element 10 .
  • a lower end of the insulator 20 protrudes from the lower surface of the power generation element 10 .
  • the upper end of the insulator 20 presses the positive electrode terminal 4 against the first exterior body 31 .
  • the lower end of the insulator 20 presses the negative terminal 5 against the second exterior body 32 .
  • the insulator 20 is made of resin, for example.
  • the insulator 20 is, for example, polyethylene terephthalate (PET), polyacetal (POM), polyphenylene sulfide (PPS), polyetheretherketone (PEEK), polypropylene (PP), polyethylene (PE), polytetrafluoroethylene (PTFE). is.
  • the tensile modulus of elasticity of the insulator 20 is preferably, for example, 3000 MPa or more.
  • the insulator 20 is preferably made of polyethylene terephthalate (PET), polyacetal (POM), polyphenylene sulfide (PPS), polyetheretherketone (PEEK), for example.
  • PET polyethylene terephthalate
  • POM polyacetal
  • PPS polyphenylene sulfide
  • PEEK polyetheretherketone
  • the exterior body 30 accommodates the power generating element 10 inside.
  • the exterior body 30 prevents leakage of the electrolytic solution to the outside and entry of moisture into the inside of the battery 100 from the outside.
  • the exterior body 30 has a first exterior body 31 , a second exterior body 32 and a gasket 33 .
  • the first exterior body 31 and the second exterior body 32 sandwich the power generating element 10 in the z direction.
  • the gasket 33 seals between the first exterior body 31 and the second exterior body 32 .
  • the first armor 31 and the second armor 32 are conductors.
  • the first exterior body 31 and the second exterior body 32 are made of metal, for example.
  • the first exterior body 31 is connected to the positive electrode terminal 4 .
  • the second exterior body 32 is connected to the negative terminal 5 .
  • the first exterior body 31 and the positive terminal 4 and the second exterior body 32 and the negative terminal 5 are welded together, for example.
  • the battery 100 includes a manufacturing process of the power generating element 10 and a housing process of the power generating element 10 .
  • the manufacturing process of the power generation element 10 includes, for example, a preparation process and a winding process.
  • a preparation process and a winding process In the preparation step, each of the positive electrode 1, the negative electrode 2, and the separator 3 shown in FIG. 2 is prepared.
  • the positive electrode 1 is manufactured by, for example, sequentially performing a slurry preparation process, an electrode application process, a drying process, a rolling process, and a terminal connection process.
  • the slurry preparation process is a process of mixing a positive electrode active material, a binder, a conductive aid and a solvent to prepare a slurry.
  • Solvents are, for example, water, N-methyl-2-pyrrolidone, and the like.
  • the composition ratio of the positive electrode active material, the conductive aid, and the binder is preferably 70 wt % to 100 wt %:0 wt % to 10 wt %:0 wt % to 20 wt % in mass ratio. These mass ratios are adjusted so that the total is 100 wt %.
  • the electrode application step is a step of applying slurry to the surface of the positive electrode current collector 1A.
  • the slurry application method is not particularly limited.
  • a slit die coating method and a doctor blade method can be used as a slurry coating method.
  • the drying process is the process of removing the solvent from the slurry.
  • the positive electrode current collector 1A coated with the slurry is dried in an atmosphere of 80.degree. C. to 150.degree.
  • the cathode active material layer 1B is formed on the cathode current collector 1A.
  • the rolling process is performed as needed.
  • the rolling step is a step of applying pressure to the positive electrode active material layer 1B to adjust the density of the positive electrode active material layer 1B.
  • the rolling process is performed by, for example, a roll press device.
  • the terminal connection step is a step of connecting the positive electrode terminal 4 to the positive electrode current collector 1A.
  • the positive electrode terminal 4 is connected to the uncoated portion or the removed portion of the positive electrode active material layer 1B.
  • the positive terminal 4 is connected to the positive current collector 1A by, for example, welding or screwing.
  • the negative electrode 2 can be produced in the same procedure as the positive electrode 1.
  • the negative electrode 2 is manufactured by forming the negative electrode active material layer 2B on the surface of the negative electrode current collector 2A and connecting the negative electrode terminal 5 to the negative electrode current collector 2A.
  • a commercially available separator 3 can be used.
  • An insulator 20 is adhered to one end of the separator 3 located on the innermost circumference.
  • the separator 3, the positive electrode 1, the separator 3, and the negative electrode 2 are laminated in order, and these are wound using the insulator 20 as the winding core.
  • the power generation element 10 is immersed in the electrolytic solution.
  • An insulating tape 6 may be attached to the upper and lower surfaces of the power generation element 10 .
  • the housing process of the power generating element 10 includes a welding process and a sealing process.
  • the power generation element 10 and the gasket 33 are inserted into the first exterior body 31 .
  • the first exterior body 31 and the positive electrode terminal 4 are welded together. Welding is performed, for example, by resistance welding or laser welding.
  • the second armor 32 is inserted into the first armor 31 .
  • the insulator 20 protruding from the power generation element 10 presses the positive terminal 4 against the first exterior body 31 and presses the negative terminal 5 against the second exterior body 32 .
  • the second exterior body 32 and the negative electrode terminal 5 are welded together.
  • the side surface of the first exterior body 31 is tightened, and the gasket 33 seals the first exterior body 31 and the second exterior body 32 .
  • the insulator 20 presses the positive electrode terminal 4 against the first package 31 and presses the negative electrode terminal 5 against the second package 32 . Therefore, it is possible to suppress the generation of a space between the positive electrode terminal 4 and the first exterior body 31 and between the negative electrode terminal 5 and the second exterior body 32 during welding. Spaces between them cause poor welding. Poor welding causes an increase in the internal resistance of battery 100 .
  • FIG. 3 is a cross-sectional view of a battery 101 according to a first modified example.
  • Battery 101 differs from insulator 20 in insulator 21 .
  • the insulator 21 has a space 22 inside. Space 22 extends, for example, in the z-direction.
  • the space 22 is a through hole penetrating the insulator 21 in the z direction.
  • Space 22 may be a groove extending in the z-direction along the side surface of insulator 21 .
  • the insulator 21 is made of the same material as the insulator 20 .
  • the length L21 of the insulator 21 in the z direction is equal to or greater than the length L2 of the negative electrode 2, and preferably longer than the length L2 of the negative electrode 2.
  • the battery 101 according to the first modification exhibits the same effects as the battery 100.
  • the production of the wound body is facilitated.
  • FIG. 4 is a cross-sectional view of the battery 102 according to the second embodiment.
  • the battery 102 differs from the battery 100 in that the power generation element 11 is a laminate.
  • the same components as in the battery 100 are denoted by the same reference numerals, and the description thereof is omitted.
  • the positive electrode 1 and the negative electrode 2 are alternately laminated with the separator 3 interposed therebetween.
  • the power generation element 11 has a positive electrode 1, a negative electrode 2, and a separator 3 stacked in the z direction.
  • the positive terminal 4 is connected to each of the positive electrodes 1, for example.
  • the negative terminal 5 is connected to each of the negative electrodes 2, for example.
  • the insulator 20 penetrates the power generation element 11 in the z direction.
  • the length L20 of the insulator 20 in the z direction is, for example, equal to or greater than the length L11 of the power generation element 11 in the z direction.
  • the length of the power generation element 11 in the z direction is the thickness of the laminate in the lamination direction.
  • the length L20 of the insulator 20 in the z direction is preferably longer than the length L11 of the power generating element 11 in the z direction, more preferably 1.04 times or more the length L11 of the power generating element 11 in the z direction.
  • the z-direction length L20 of the insulator 20 is preferably 1.08 times or less the z-direction length L11 of the power generation element 11 .
  • the z-direction length L20 of the insulator 20 is, for example, preferably longer than the z-direction length L11 of the power generation element 11 by 2 mm or more, and preferably 4 mm or less of the z-direction length L11 of the power generation element 11. .
  • the insulator 20 protrudes from each of the upper and lower surfaces of the power generation element 11 in the z direction.
  • the upper end of the insulator 20 protrudes from the upper surface of the power generation element 11 .
  • a lower end of the insulator 20 protrudes from the lower surface of the power generation element 11 .
  • the insulator 20 presses the positive electrode terminal 4 against the first package 31 and presses the negative electrode terminal 5 against the second package 32 . Therefore, the battery 102 according to the second embodiment has the same effects as the battery 100 according to the first embodiment.
  • the insulator 20 may be the insulator 21 having the space 22 as in FIG.
  • FIG. 5 is a cross-sectional view of a battery 103 according to a second modified example.
  • the battery 103 differs from the battery 102 in that the power generating element 12 is a laminate and the stacking direction is the x direction.
  • the same components as in the battery 102 are denoted by the same reference numerals, and the description thereof is omitted.
  • the positive electrode 1 and the negative electrode 2 are alternately laminated with the separator 3 interposed therebetween.
  • the power generation element 12 has a positive electrode 1, a negative electrode 2, and a separator 3 stacked in the x direction.
  • the positive terminal 4 is connected to each of the positive electrodes 1, for example.
  • the negative terminal 5 is connected to each of the negative electrodes 2, for example.
  • the insulator 20 penetrates the power generation element 12 in the z direction. In the second modification, the length L20 of the insulator 20 in the z direction is, for example, equal to or greater than the length L2 of the negative electrode 2 in the z direction.
  • the insulator 20 protrudes from each of the upper and lower surfaces of the power generation element 12 in the z direction.
  • the upper end of the insulator 20 protrudes from the upper surface of the power generation element 12 .
  • a lower end of the insulator 20 protrudes from the lower surface of the power generation element 12 .
  • the insulator 20 presses the positive electrode terminal 4 against the first package 31 and presses the negative electrode terminal 5 against the second package 32 . Therefore, the battery 103 according to the second modification has the same effects as the battery 100 according to the first embodiment.
  • Example 1 A positive electrode slurry was applied to one surface of an aluminum foil having a thickness of 15 ⁇ m.
  • a positive electrode slurry was prepared by mixing a positive electrode active material, a conductive aid, a binder, and a solvent.
  • a ternary compound of nickel, manganese and cobalt (NCM811) was used as the positive electrode active material. Carbon black was used as the conductive aid. Polyvinylidene fluoride (PVDF) was used as the binder. N-methyl-2-pyrrolidone was used as the solvent.
  • a positive electrode slurry was prepared by mixing 90 parts by mass of a positive electrode active material, 5 parts by mass of a conductive aid, 5 parts by mass of a binder, and 70 parts by mass of a solvent. The amount of the positive electrode active material supported in the dried positive electrode active material layer was 15 mg/cm 2 .
  • a positive electrode active material layer was formed by removing the solvent from the positive electrode slurry in a drying oven. The positive electrode active material layer was pressed with a roll press. Then, a positive electrode terminal made of aluminum was attached to the positive electrode current collector.
  • a negative electrode slurry was applied to one surface of a copper foil having a thickness of 10 ⁇ m.
  • a negative electrode slurry was prepared by mixing a negative electrode active material, a conductive aid, a binder, and a solvent.
  • Graphite was used as the negative electrode active material. Carbon black was used as the conductive aid. Two types of binders, styrene-butadiene rubber (SBR) and carboxymethyl cellulose (CMC), were used. N-methyl-2-pyrrolidone was used as the solvent. 94 parts by mass of a negative electrode active material, 2 parts by mass of a conductive aid, 2.5 parts by mass of SBR, and 1.5 parts by mass of CMC are mixed with N-methyl-2-pyrrolidone to form a negative electrode. A slurry was prepared. The amount of the negative electrode active material supported on the dried negative electrode active material layer was 10.5 mg/cm 2 . A negative electrode active material layer was produced by removing the solvent from the negative electrode slurry in a drying oven. The negative electrode active material layer was formed by pressing with a roll press. A negative electrode terminal made of nickel was attached to the negative electrode current collector.
  • SBR styrene-butadiene rubber
  • CMC carboxymethyl cellulose
  • EC ethylene carbonate
  • EMC ethyl methyl carbonate
  • LiPF 6 lithium hexafluorophosphate
  • the separator, the positive electrode, the separator, and the negative electrode were laminated in this order, and wound using the pin as the winding shaft.
  • the length of the pin was 52 mm.
  • the width (length) of the negative electrode was 49 mm.
  • the pin length was 1.06 times the width of the negative electrode.
  • the wound body was housed in the first exterior body, and the positive terminal exposed from the first surface of the wound body was welded to the first exterior body.
  • the second armor was inserted into the first armor, and the negative electrode terminal exposed from the second surface of the wound body was welded to the second armor.
  • Welding between the positive terminal and the first armor was performed by resistance welding, and welding between the negative terminal and the second armor was performed by laser welding.
  • the completed battery is charged under the conditions of 25° C., CC-CV (Constant Current-Constant Voltage) charging, upper limit voltage of 4.2 V, 20 mA, and charging time of 3.5 hours.
  • CC-CV Constant Current-Constant Voltage
  • a battery with a voltage of 4.1 V or more after 28 hours from the start of charging was regarded as a good product, and a battery with a voltage of less than 4.1 V was regarded as a defective product.
  • the internal resistance of the battery was also measured. The internal resistance was obtained as an average value of the produced samples.
  • the internal resistance was obtained by using BT3563 (manufactured by Hioki Electric Co., Ltd.) and bringing the measuring terminal into contact with the tab (terminal) of the battery.
  • Example 2 Comparative Example 1, Comparative Example 2
  • Example 2 Comparative Example 1
  • Comparative Example 1 differ from Example 1 in that the pin lengths are changed.
  • Other conditions were the same as in Example 1, and the defect rate and internal resistance of tab welding were measured.
  • Example 2 the length of the pin was 51 mm.
  • the pin length was 1.04 times the width of the negative electrode.
  • Comparative Example 1 has a pin length of 48 mm. The pin length was 0.98 times the width of the negative electrode.
  • Comparative Example 2 has a pin length of 45 mm.
  • the pin length was 0.92 times the width of the negative electrode.
  • Example 1 The evaluation results of Example 1, Example 2, Comparative Example 1, and Comparative Example 2 are summarized in Table 1.
  • SYMBOLS 1... Positive electrode, 1A... Positive electrode collector, 1B... Positive electrode active material layer, 2... Negative electrode, 2A... Negative electrode collector, 2B... Negative electrode active material layer, 3... Separator, 4... Positive electrode terminal, 5... Negative electrode terminal, DESCRIPTION OF SYMBOLS 10, 11, 12... Power generation element, 20, 21... Insulator, 22... Space, 30... Exterior body, 31... First exterior body, 32... Second exterior body, 33... Gasket, 100, 101, 102, 103 ...battery

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

L'invention concerne une batterie comprenant : un élément de génération d'énergie qui comprend une électrode positive à laquelle une borne d'électrode positive est connectée, une électrode négative à laquelle une borne d'électrode négative est connectée, et un séparateur qui est intercalé entre l'électrode positive et l'électrode négative ; un isolant qui pénètre à travers l'élément de génération d'énergie dans une première direction ; et un premier corps extérieur et un second corps extérieur qui intercalent l'élément de génération d'énergie entre ceux-ci dans la première direction. La longueur de l'isolant dans la première direction est au moins la longueur de l'électrode négative dans la première direction, et l'isolant pousse la borne d'électrode positive contre le premier corps extérieur et pousse la borne d'électrode négative contre le second corps extérieur.
PCT/JP2022/043280 2021-12-06 2022-11-24 Batterie WO2023106099A1 (fr)

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JP2021197911A JP2023083913A (ja) 2021-12-06 2021-12-06 電池
JP2021-197911 2021-12-06

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011159491A (ja) * 2010-02-01 2011-08-18 Hitachi Maxell Energy Ltd 扁平形非水二次電池
JP2012530337A (ja) * 2009-06-18 2012-11-29 ヴァルタ マイクロバッテリー ゲゼルシャフト ミット ベシュレンクテル ハフツング 巻き電極を持つボタン電池及びその製造方法
CN110364676A (zh) * 2019-07-12 2019-10-22 昆山兴能能源科技有限公司 一种扣式锂二次电池
US20210057681A1 (en) * 2019-08-19 2021-02-25 Samsung Sdi Co., Ltd. Rechargeable battery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012530337A (ja) * 2009-06-18 2012-11-29 ヴァルタ マイクロバッテリー ゲゼルシャフト ミット ベシュレンクテル ハフツング 巻き電極を持つボタン電池及びその製造方法
JP2011159491A (ja) * 2010-02-01 2011-08-18 Hitachi Maxell Energy Ltd 扁平形非水二次電池
CN110364676A (zh) * 2019-07-12 2019-10-22 昆山兴能能源科技有限公司 一种扣式锂二次电池
US20210057681A1 (en) * 2019-08-19 2021-02-25 Samsung Sdi Co., Ltd. Rechargeable battery

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