WO2021006171A1 - Batterie - Google Patents

Batterie Download PDF

Info

Publication number
WO2021006171A1
WO2021006171A1 PCT/JP2020/025973 JP2020025973W WO2021006171A1 WO 2021006171 A1 WO2021006171 A1 WO 2021006171A1 JP 2020025973 W JP2020025973 W JP 2020025973W WO 2021006171 A1 WO2021006171 A1 WO 2021006171A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
electrode body
negative electrode
lead
electrode plate
Prior art date
Application number
PCT/JP2020/025973
Other languages
English (en)
Japanese (ja)
Inventor
吉一 堀越
大貴 西家
徳川　秀昭
Original Assignee
株式会社村田製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2021006171A1 publication Critical patent/WO2021006171A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a battery.
  • a non-aqueous electrolyte secondary battery (for example, a lithium ion secondary battery) is used as a portable power source for these electronic devices.
  • a secondary battery a configuration in which a positive electrode and a negative electrode are laminated via a separator is known.
  • Patent Document 1 describes a secondary battery in which an electrode tab (electrode lead) is provided on the outermost periphery of an electrode body having a flat wound structure.
  • Patent Document 1 since the electrode leads are welded and attached to the outermost outer surface of the electrode body, the electrode leads are exposed on the outer surface of the electrode body, and unevenness is generated according to the thickness of the electrode leads. When such an electrode body is housed in the case, the unevenness appears on the case according to the unevenness of the electrode body, so that the appearance of the battery is impaired. In addition, since the shape of the battery becomes distorted, there arises a problem that it hinders the battery from being closely attached to the battery housing portion of the electronic device.
  • an electrode lead to the inner surface of the electrode plate located on the outermost circumference of the electrode body.
  • the electrode leads are not exposed on the outermost periphery of the electrode body, so that the occurrence of irregularities on the electrode body can be suppressed.
  • the electrode lead is attached to the electrode plate by a method such as welding, but from the viewpoint of workability and the like, welding or the like is performed from the electrode lead side to the electrode plate side. Therefore, mounting marks are generated on the surface of the electrode body facing the mounting portion of the electrode lead. Since the portion where the mounting mark is generated is roughened, metal powder may be generated and an internal short circuit may occur due to the contact between the mounting mark and the case.
  • an object of the present invention is to provide a battery that suppresses the occurrence of an internal short circuit.
  • an electrode body in which a first electrode plate and a second electrode plate face each other via a separator is used. Electrode reeds that are electrically connected to the electrode body, Equipped with a case for storing the electrode body
  • the electrode lead is attached to the inner surface of the electrode body in either the first electrode plate or the second electrode plate located on the outermost surface of the electrode body.
  • the attachment portion between the electrode lead and the electrode plate is attached with a part of the electrode lead protruding toward the outside of the electrode body.
  • the battery is provided with a protective layer containing a resin between the case and the region of the outermost surface of the electrode body facing the mounting portion.
  • the effects described here are not necessarily limited, and may be any of the effects described in the present invention or an effect different from them.
  • FIG. 1 is an exploded perspective view showing an example of the configuration of a non-aqueous electrolyte secondary battery according to the first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along the line II-II of FIG.
  • FIG. 3 is a plan view showing the configuration of the electrode body of the first embodiment of the secondary battery according to the present invention.
  • FIG. 4 is a cross-sectional view showing the configuration of the electrode body of the second embodiment of the secondary battery according to the present invention.
  • FIG. 5 is a cross-sectional view showing the configuration of the electrode body of the third embodiment of the secondary battery according to the present invention.
  • FIG. 6 is a cross-sectional view showing the configuration of an electrode body of a secondary battery as a comparative example.
  • FIG. 7 is a block diagram for explaining an application example of the present invention.
  • the battery has a flat shape.
  • the battery is attached with a positive electrode lead 31 (positive electrode tab) and a negative electrode lead (negative electrode tab) 32, and has a flat wound electrode body 20, an electrolytic solution as an electrolyte (not shown), and these electrodes. It includes a body 20 and a case 10 for accommodating an electrolytic solution.
  • the battery When the battery is viewed in a plane from the direction perpendicular to its main surface, the battery has a rectangular shape.
  • the case 10 is a metal can, which is made of, for example, iron (Fe) or stainless steel, and has conductivity. By having conductivity, the case 10 can also be used as an electrode terminal, which is preferable.
  • the surface of the metal can may be plated with nickel (Ni) or the like.
  • the case 10 includes a housing portion 11 and a lid portion 12.
  • the accommodating portion 11 includes a main surface portion 11A and a wall portion 11B provided on the peripheral edge of the main surface portion 11A.
  • the main surface portion 11A covers the main surface of the electrode body 20, and the wall portion 11B covers the side surface and the end surface of the electrode body 20.
  • a positive electrode terminal 13 is provided on a portion of the wall portion 11B facing one end surface of the electrode body 20 (the end surface on the side from which the positive electrode lead 31 and the negative electrode lead 32 are taken out).
  • the positive electrode lead 31 is connected to the positive electrode terminal 13.
  • the negative electrode lead 32 is connected to the inner surface of the case 10.
  • the lid portion 12 covers the opening of the accommodating portion 11. The top of the wall portion 11B of the accommodating portion 11 and the peripheral edge portion of the lid portion 12 are joined by welding or an adhesive or the like.
  • the positive electrode lead 31 and the negative electrode lead 32 are derived from one end face of the electrode body 20.
  • the positive electrode lead 31 and the negative electrode lead 32 are each made of a metal material such as Al, Cu, Ni, or stainless steel, and each has a thin plate shape or the like.
  • Sealants 31A and 32A for preventing the intrusion of outside air are inserted between the case 10 and the positive electrode lead 31 and between the case 10 and the negative electrode lead 32, respectively.
  • the sealants 31A and 32A are made of a material having adhesion to the positive electrode lead 31 and the negative electrode lead 32, for example, a polyolefin resin such as polyethylene, polypropylene, modified polyethylene or modified polypropylene.
  • the electrode body 20 has a pair of flat portions 20A facing each other and a pair of curved portions 20B provided between the pair of flat portions 20A and facing each other.
  • the electrode body 20 includes a strip-shaped positive electrode plate 21, a strip-shaped negative electrode plate 22, two strip-shaped separators 23A and 23B, resin layers 25B1 and 25B2 provided on the positive electrode plate 21, and a negative electrode plate 22.
  • the resin layers 26B1 and 26B2 provided in the above are provided.
  • the electrode body 20 has a structure in which a positive electrode plate 21 and a negative electrode plate 22 are laminated via a separator 23A or a separator 23B and wound in the longitudinal direction so as to be flat and spiral.
  • the electrode body 20 is wound so that the positive electrode plate 21 serves as the innermost electrode and the negative electrode plate 22 serves as the outermost electrode.
  • the negative electrode plate 22, which is the outermost electrode, is fixed by an insulating tape 24 as an insulating layer.
  • the insulating tape 24 also has a function as a winding stop tape.
  • the positive electrode plate 21, the negative electrode plate 22, and the separators 23A and 23B are impregnated with the electrolytic solution.
  • the positive electrode plate 21 has a positive electrode current collector 21A having an inner side surface (first surface) 21S1 and an outer surface (second surface) 21S2, and a positive electrode active material layer provided on the inner side surface 21S1 of the positive electrode current collector 21A.
  • 21B1 and a positive electrode active material layer 21B2 provided on the outer surface 21S2 of the positive electrode current collector 21A are provided.
  • the "inner surface” means a surface located on the center side of the electrode body 20
  • the “outer surface” means a surface located on the side opposite to the center of the electrode body 20.
  • the center of the electrode body 20 and the winding center of the electrode body 20 are substantially the same.
  • the positive electrode active material layer 21B1 is not provided on the inner side surface 21S1 of the outer peripheral end of the positive electrode plate 21, and the positive electrode current collector exposed portion 21D1 in which the inner side surface 21S1 of the positive electrode current collector 21A is exposed is provided. ..
  • the outer surface 21S2 of the outer peripheral end of the positive electrode plate 21 is not provided with the positive electrode active material layer 21B2, but is provided with the positive electrode current collector exposed portion 21D2 in which the outer surface 21S2 of the positive electrode current collector 21A is exposed. ..
  • a positive electrode lead 31 is connected to a portion of the positive electrode current collector exposed portion 21D2 facing the flat portion 20A.
  • the positive electrode lead 31 is provided at the outer peripheral end of the positive electrode plate 21 in this way, the positive electrode lead 31 can be linearly led out from the inside to the outside of the case 10 as described above.
  • the length of the positive electrode current collector exposed portion 21D1 in the winding direction is, for example, substantially the same as the length of the positive electrode current collector exposed portion 21D2 in the winding direction.
  • the positive electrode current collector 21A is made of, for example, a metal foil such as an aluminum foil, a nickel foil, or a stainless steel foil.
  • the positive electrode active material layers 21B1 and 21B2 contain a positive electrode active material capable of occluding and releasing lithium.
  • the positive electrode active material layers 21B1 and 21B2 may further contain at least one of a binder and a conductive agent, if necessary.
  • a lithium-containing compound such as a lithium oxide, a lithium phosphorus oxide, a lithium sulfide, or an interlayer compound containing lithium is suitable, and two or more of these may be mixed and used.
  • a lithium-containing compound containing lithium, a transition metal element, and oxygen is preferable.
  • the lithium-containing compound is more preferably one containing at least one selected from the group consisting of Co, Ni, Mn and Fe as a transition metal element.
  • LiNi 0.50 Co 0.20 Mn 0.30 O 2 LiCoO 2 , LiNiO 2 , LiNi a Co 1-a O 2 (0 ⁇ a ⁇ 1), LiMn 2 O 4 or LiFePO 4 and the like. There is.
  • lithium-free inorganic compounds such as MnO 2 , V 2 O 5 , V 6 O 13 , NiS, and MoS can be used as the positive electrode active material capable of occluding and releasing lithium. it can.
  • the positive electrode active material capable of occluding and releasing lithium may be other than the above.
  • two or more kinds of positive electrode active materials exemplified above may be mixed in any combination.
  • the binder is, for example, at least one selected from the group consisting of polyvinylidene fluoride, polytetrafluoroethylene, polyacrylonitrile, styrene butadiene rubber, carboxymethyl cellulose, and a copolymer mainly composed of one of these resin materials. Seeds can be used.
  • the conductive agent for example, at least one carbon material selected from the group consisting of graphite, carbon fiber, carbon black, acetylene black, ketjen black, carbon nanotubes, graphene and the like can be used.
  • the conductive agent may be any material having conductivity, and is not limited to the carbon material.
  • a metal material, a conductive polymer material, or the like may be used as the conductive agent.
  • the shape of the conductive agent includes, for example, granular, scaly, hollow, needle-shaped, tubular, and the like, but is not particularly limited to these shapes.
  • the negative electrode plate 22 has a negative electrode current collector 22A having an inner side surface (first surface) 22S1 and an outer surface (second surface) 22S2, and a negative electrode active material layer provided on the inner side surface 22S1 of the negative electrode current collector 22A. 22B1 and a negative electrode active material layer 22B2 provided on the outer surface 22S2 of the negative electrode current collector 22A are provided.
  • the negative electrode active material layer 22B1 is not provided on the inner side surface 22S1 of the outer peripheral end of the negative electrode plate 22, and the negative electrode current collector exposed portion 22D1 in which the inner side surface 22S1 of the positive electrode current collector 21A is exposed is provided. ..
  • the negative electrode active material layer 22B2 is not provided on the outer surface 22S2 of the outer peripheral end of the negative electrode plate 22, and the negative electrode current collector exposed portion 22D2 in which the outer surface 22S2 of the negative electrode current collector 22A is exposed is provided. ..
  • a negative electrode lead 32 is connected to a portion of the negative electrode current collector exposed portion 22D1 facing the flat portion 20A.
  • the negative electrode lead 32 is provided at the outer peripheral end of the negative electrode plate 22 in this way, the negative electrode lead 32 can be linearly led out from the inside to the outside of the case 10 as described above.
  • the positive electrode lead 31 and the negative electrode lead 32 are provided on the same flat portion 20A side.
  • the length of the negative electrode current collector exposed portion 22D1 in the winding direction is about one turn longer than the length of the negative electrode current collector exposed portion 22D2 in the winding direction. That is, the negative electrode plate 22 is provided with, for example, about one single-sided electrode portion in which only the negative electrode active material layer 22B1 is provided on the negative electrode current collector 22A among the negative electrode active material layer 22B1 and the negative electrode active material layer 22B2. ing.
  • both the inner side surface 22S1 and the outer side surface 22S2 of the negative electrode current collector 22A are exposed (that is, the negative electrode current collector exposed portion 22D1 and the negative electrode current collector exposed portion on both sides of the positive electrode plate 21).
  • the portion where 22D2 is provided) is provided, for example, over about one round. That is, the negative electrode current collector exposed portion 22D2 and the inner side surface of the case 10 come into contact with each other and come into electrical contact with each other.
  • the case 10 can also be used as an electrode terminal, and the resistance between the negative electrode plate 22 and the case 10 can be reduced.
  • the negative electrode current collector 22A is made of, for example, a metal foil such as a copper foil, a nickel foil, or a stainless steel foil.
  • the negative electrode active material layers 22B1 and 22B2 contain a negative electrode active material capable of storing and releasing lithium.
  • the negative electrode active material layers 22B1 and 22B2 may further contain at least one of a binder and a conductive agent, if necessary.
  • Negative electrode active material examples include carbon materials such as non-graphitizable carbon, graphitizable carbon, graphite, pyrolytic carbon, coke, glassy carbon, calcined organic polymer compound, carbon fiber or activated carbon.
  • cokes include pitch coke, needle coke, petroleum coke and the like.
  • a calcined organic polymer compound is a material obtained by calcining a polymer material such as phenol resin or furan resin at an appropriate temperature to carbonize it, and some of it is graphitizable carbon or graphitizable carbon. Some are classified as.
  • These carbon materials are preferable because the change in crystal structure that occurs during charging / discharging is very small, a high charging / discharging capacity can be obtained, and good cycle characteristics can be obtained.
  • graphite is preferable because it has a large electrochemical equivalent and can obtain a high energy density.
  • graphitizable carbon is preferable because excellent cycle characteristics can be obtained.
  • those having a low charge / discharge potential, specifically those having a charge / discharge potential close to that of lithium metal are preferable because high energy density of the battery can be easily realized.
  • binder As the binder, the same binders as those of the positive electrode active material layers 21B1 and 21B2 can be used.
  • Conducting agent As the conductive agent, the same ones as those of the positive electrode active material layers 21B1 and 21B2 can be used.
  • the electrolytic solution is a so-called non-aqueous electrolytic solution, and contains an organic solvent (non-aqueous solvent) and an electrolyte salt dissolved in the organic solvent.
  • the electrolyte may contain known additives in order to improve battery characteristics.
  • an electrolyte layer containing an electrolytic solution and a polymer compound serving as a retainer for holding the electrolytic solution may be used.
  • the electrolyte layer may be in the form of a gel.
  • a cyclic carbonate ester such as ethylene carbonate or propylene carbonate can be used, and it is preferable to use one of ethylene carbonate and propylene carbonate, particularly both. This is because the cycle characteristics can be further improved.
  • organic solvent in addition to these cyclic carbonate esters, it is preferable to mix and use a chain carbonate ester such as diethyl carbonate, dimethyl carbonate, ethyl methyl carbonate or methyl propyl carbonate. This is because high ionic conductivity can be obtained.
  • organic solvent it is preferable to further contain 2,4-difluoroanisole or vinylene carbonate. This is because 2,4-difluoroanisole can further improve the discharge capacity, and vinylene carbonate can further improve the cycle characteristics. Therefore, it is preferable to mix and use these because the discharge capacity and the cycle characteristics can be further improved.
  • organic solvents butylene carbonate, ⁇ -butyrolactone, ⁇ -valerolactone, 1,2-dimethoxyethane, tetrahydrofuran, 2-methylnitrile, 1,3-dioxolane, 4-methyl-1,3 -Dioxolane, methyl acetate, methyl propionate, acetonitrile, glutaronitrile, adiponitrile, methoxyacetonitrile, 3-methoxypropionitrile, N, N-dimethylformamide, N-methylpyrrolidinone, N-methyloxazolidinone, N, N- Examples thereof include dimethylimidazolidinone, nitromethane, nitroethane, sulfolane, dimethylsulfoxide, trimethyl phosphate and the like.
  • a compound in which at least a part of hydrogen of these organic solvents is replaced with fluorine may be preferable because the reversibility of the electrode reaction may be improved depending on the type of electrode to be combined.
  • Examples of the electrolyte salt include lithium salts, and one type may be used alone or two or more types may be mixed and used.
  • Lithium salts include LiPF 6 , LiBF 4 , LiAsF 6 , LiClO 4 , LiB (C 6 H 5 ) 4 , LiCH 3 SO 3 , LiCF 3 SO 3 , LiN (SO 2 CF 3 ) 2 , LiC (SO 2 CF). 3 ) 3 , LiAlCl 4 , LiSiF 6 , LiCl, difluoro [oxorat-O, O'] lithium borate, lithium bisoxalate volate, LiBr and the like can be mentioned.
  • LiPF 6 is preferable because it can obtain high ionic conductivity and further improve the cycle characteristics.
  • the resin layers 25A1, 25A2, 25B1 and 25B2 are resin layers provided on the positive electrode.
  • the resin layers 26B1 and 26B2 are resin layers provided on the negative electrode.
  • the resin layers 25A1, 25A2, 25B1, 25B2, 26B1, and 26B2 may be, for example, a resin film or a resin tape having an adhesive surface.
  • the resin layer may have an insulating property.
  • the insulating resin layer in the present specification means that the resin layer does not contain a conductive carbon material, metal, or the like, so that the resin layer has insulating properties.
  • an insulating resin may be used as the base material of the resin layer, or the resin may further contain insulating ceramics.
  • the insulating resin include polyethylene, polypropylene, polystyrene, PET, and polyimide.
  • the resin layers 25A1, 25A2, 25B1, 25B2, 26B1 and 26B2 are insulating resin tapes including a base material and an adhesive layer provided on the base material. It is preferable to use a resin tape for the resin layer because it is easy to handle in the assembling process of the electrode body 20 and therefore a battery can be easily manufactured.
  • the negative electrode lead 32 is attached by welding, for example.
  • a general welding method can be used, and for example, resistance welding, ultrasonic welding, laser welding and the like can be used. Laser welding is used in this embodiment. From the viewpoint of workability, the negative electrode lead 32 is welded from the negative electrode lead 32 side toward the negative electrode current collector 22A side.
  • the welded portion of the negative electrode lead 32 is welded so that the negative electrode lead 32 and the negative electrode current collector 22A are deformed into a shape protruding outward from the electrode body 20.
  • a part of the negative electrode lead 32 may break through the negative electrode current collector 22A and project outward of the electrode body 20. Since the negative electrode current collector 22A may be in a state in which at least one of the negative electrode active material layers 22B1 and 22B2 is provided (that is, the negative electrode plate 22), the negative electrode lead 32 and the negative electrode plate 22 are directed toward the outside of the electrode body 20. It may be eluted so as to be deformed into a protruding shape.
  • the electrode body 20 is housed in the case 10 with the mounting marks covered with a protective layer.
  • the protective layer contains a resin.
  • the region of the outer surface (attachment mark) facing the region of the inner surface to which the negative electrode lead 32 is attached is covered near one end of the insulating tape 24 (protective layer).
  • the width of the insulating tape 24 is set to be substantially equal to the portion of the negative electrode lead 32 inserted inside the electrode body 20.
  • the insulating tape 24 is provided so as to cover the negative electrode current collector exposed portion 22S2 of the curved portion 20B on one side and the flat portion (flat portion on the lower side of FIG. 2) 20A of the electrode body 20. That is, in the pair of opposite flat portions of the electrode body 20, the resin layer is also provided on the flat portion 20A on the opposite surface of the outermost flat portion 20A to which the negative electrode lead 32 is attached.
  • the coefficient of friction between the electrode body 20 and the inner surface of the case 10 can be increased to reliably prevent slippage, and the electrode body 20 can be stably held inside the case 10, so that the battery resistance can be increased. It is preferable because the vibration property can be improved.
  • the insulating tape 24 can be configuring the insulating tape 24 to cover the opposing flat portion 20A via the curved portion 20B, the insulating tape 24 can be made into a single tape, which facilitates production.
  • the outermost surface of the electrode body 20 has an exposed electrode plate portion in the flat portion 20A to the curved portion 20B in which the insulating tape 24 is not provided.
  • the exposed electrode plate portion makes it possible to dissipate heat from the exposed portion, and it is possible to suppress a temperature rise of the electrode body 20 due to charging / discharging of the battery, which is preferable.
  • the exposed electrode plate portion is provided so as to include the central portion of the flat portion 20A facing the main surface portion 11A to the lid portion 12 of the case 10. As a result, heat can be dissipated in the vicinity of the central portion of the electrode body 20 where the temperature rise is large, and the temperature rise of the electrode body 20 can be suppressed more efficiently, which is preferable.
  • the central portion refers to a portion having an area of 50% including the central portion with respect to the total area of the flat portion 20A.
  • the material of the protective layer is preferably insulating.
  • the case 10 When the case 10 has conductivity, the case 10 can also be used as an electrode terminal of the battery, but when the unevenness and the case 10 are electrically connected, the contact resistance varies depending on the shape of the unevenness. Since the protective layer has an insulating property, it is possible to suppress variations in battery resistance.
  • the same material as the resin layer can be applied as the material of the protective layer.
  • the tape may be the same as the resin layer, or may be different. In this embodiment, PET tape is used as the insulating tape 24.
  • FIG. 3 shows a state in which the insulating tape 24 is adhered to the electrode body 20 of the first embodiment.
  • the insulating tape 24 substantially covers the entire flat portion 20A on the opposite side to the flat portion to which the leads are attached from the region of the outer surface of the negative electrode current collector 22A facing the inner side surface to which the negative electrode leads 32 are attached.
  • a concavo-convex pattern 33 is added to the flat portion on the opposite side. Having the uneven pattern 33 is preferable because the friction coefficient of the insulating tape 24 is further increased, the electrode body 20 can be more reliably fixed in the case 10, and the vibration resistance of the battery is improved.
  • the uneven pattern 33 can be created by laser processing as an example.
  • the uneven pattern 33 can be a one-dimensional or two-dimensional barcode.
  • the insulating tape 24A covers the region of the outer surface facing the region of the inner surface of the negative electrode current collector to which the negative electrode lead 32 is attached.
  • the width of the insulating tape 24A is equal to or slightly larger than the width of this outer surface region.
  • the insulating tape 24B is adhered so as to cover the exposed portion of the negative electrode current collector of the flat portion (flat portion on the lower side of FIG. 4) 20A on the opposite side of the electrode body 20.
  • An uneven pattern is formed on the surface of the insulating tape 24B by laser processing.
  • the configurations other than the insulating tapes 24A and 24B are the same as those in the first embodiment.
  • the second embodiment also produces the same effect as the first embodiment described above. That is, the welding marks generated on the outer surface of the negative electrode plate 22 can be covered with the insulating tape 24A. As a result, the risk of internal short circuit due to the metal powder generated by welding falling off can be reduced. Further, since the insulating tapes 24A and 24B are provided on the flat portions 20A on both sides of the electrode body 20, the friction coefficient between the flat portions 20A and the case 10 can be increased to prevent slippage.
  • the insulating tape 24 covers the region of the outer surface facing the region of the inner surface of the negative electrode current collector to which the negative electrode lead 32 is attached.
  • the insulating tape 24 is extended so as to cover the curved portion 20B on one side of the electrode body 20.
  • the third embodiment also produces the same effects as those of the first and second embodiments described above.
  • the insulating tape 24 does not cover the flat portion 20A on the opposite side, the uneven pattern cannot be provided as in other embodiments.
  • the electronic device 100 includes an electronic circuit 110 of the main body of the electronic device and a battery pack 120.
  • the battery pack 120 is electrically connected to the electronic circuit 110 via the positive electrode terminal 123a and the negative electrode terminal 123b.
  • the electronic device 100 may have a structure in which the battery pack 120 can be attached and detached.
  • Examples of the electronic device 100 include a notebook personal computer, a tablet computer, a mobile phone (for example, a smartphone), a personal digital assistant (PDA), a display device (LCD (Liquid Crystal Display), and an EL (Electro Luminescence).
  • a notebook personal computer for example, a smartphone
  • a tablet computer for example, a mobile phone (for example, a smartphone), a personal digital assistant (PDA), a display device (LCD (Liquid Crystal Display), and an EL (Electro Luminescence).
  • PDA personal digital assistant
  • LCD Liquid Crystal Display
  • EL Electro Luminescence
  • Display electronic paper, etc.
  • imaging device for example, digital still camera, digital video camera, etc.
  • audio equipment for example, portable audio player
  • game equipment cordless phone handset, electronic book, electronic dictionary, radio, headphones, navigation System, memory card, pacemaker, hearing aid, power tool, electric shaver, refrigerator, air conditioner, TV, stereo, water heater, microwave oven, dishwasher, washing machine, dryer, lighting equipment, toys, medical equipment, robot, road conditioner
  • a signal device and the like can be mentioned, but the present invention is not limited to these.
  • the electronic circuit 110 includes, for example, a CPU (Central Processing Unit), a peripheral logic unit, an interface unit, a storage unit, and the like, and controls the entire electronic device 100.
  • a CPU Central Processing Unit
  • the battery pack 120 includes an assembled battery 121 and a charge / discharge circuit 122.
  • the battery pack 120 may further include an exterior material (not shown) that houses the assembled battery 121 and the charge / discharge circuit 122, if necessary.
  • the assembled battery 121 is configured by connecting a plurality of secondary batteries 121a in series and / or in parallel.
  • the plurality of secondary batteries 121a are connected, for example, in n parallel m series (n and m are positive integers).
  • FIG. 7 shows an example in which six secondary batteries 121a are connected in two parallels and three series (2P3S).
  • the secondary battery 121a the secondary battery is used in the present invention described above.
  • the battery pack 120 includes an assembled battery 121 composed of a plurality of secondary batteries 121a.
  • the battery pack 120 includes one secondary battery 121a instead of the assembled battery 121. It may be adopted.
  • the charge / discharge circuit 122 is a control unit that controls the charge / discharge of the assembled battery 121. Specifically, at the time of charging, the charging / discharging circuit 122 controls charging of the assembled battery 121. On the other hand, at the time of discharge (that is, when the electronic device 100 is used), the charge / discharge circuit 122 controls the discharge to the electronic device 100.
  • the exterior material for example, a case made of a metal, a polymer resin, a composite material thereof, or the like can be used.
  • the composite material include a laminate in which a metal layer and a polymer resin layer are laminated.
  • the configurations, methods, processes, shapes, materials, numerical values, etc. given in the above-described embodiments and examples are merely examples, and if necessary, different configurations, methods, processes, shapes, materials, numerical values, etc. May be used.
  • the configurations, methods, processes, shapes, materials, numerical values, etc. of the above-described embodiments and examples can be combined with each other as long as they do not deviate from the gist of the present invention.
  • the present invention may be applied to the negative electrode 22.
  • the positive electrode 21, the negative electrode 22, and the separators 23A and 23B are wound so that the negative electrode 22 becomes the innermost electrode.
  • the insulating tape may be an insulating sheet.

Landscapes

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

Abstract

L'invention concerne une batterie équipée : d'un corps d'électrode dans lequel une première plaque d'électrode et une seconde plaque d'électrode se font face l'une à l'autre avec un séparateur entre elles; un fil d'électrode électriquement connecté au corps d'électrode; et un boîtier logeant le corps d'électrode, le fil d'électrode étant fixé à une surface dirigée vers l'intérieur du corps d'électrode dans la première plaque d'électrode ou la seconde plaque d'électrode située au niveau de la surface la plus à l'extérieur du corps d'électrode, une partie de fixation du fil d'électrode est fixée dans un état dans lequel une partie du fil d'électrode fait saillie vers l'extérieur du corps d'électrode, la partie de fixation du fil d'électrode est disposée dans un état dans lequel une partie du fil d'électrode fait saillie vers la surface la plus à l'extérieur du corps d'électrode, et une couche de protection comprenant la résine est disposée entre une région faisant face à la partie de fixation dans la surface la plus à l'extérieur du corps d'électrode et du boîtier.
PCT/JP2020/025973 2019-07-05 2020-07-02 Batterie WO2021006171A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019125878 2019-07-05
JP2019-125878 2019-07-05

Publications (1)

Publication Number Publication Date
WO2021006171A1 true WO2021006171A1 (fr) 2021-01-14

Family

ID=74115255

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/025973 WO2021006171A1 (fr) 2019-07-05 2020-07-02 Batterie

Country Status (1)

Country Link
WO (1) WO2021006171A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003086233A (ja) * 2001-09-07 2003-03-20 Mitsubishi Electric Corp 平板型電池およびその製法
JP2003109669A (ja) * 2001-09-28 2003-04-11 Sanyo Electric Co Ltd 薄型電池
JP2003272598A (ja) * 2002-03-13 2003-09-26 Matsushita Electric Ind Co Ltd 非水電解液電池およびその製造方法
JP2004127599A (ja) * 2002-09-30 2004-04-22 Hitachi Maxell Ltd 非水電解質二次電池
JP2005209531A (ja) * 2004-01-23 2005-08-04 Toshiba Corp 非水電解質二次電池
JP2017126487A (ja) * 2016-01-14 2017-07-20 トヨタ自動車株式会社 電池

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003086233A (ja) * 2001-09-07 2003-03-20 Mitsubishi Electric Corp 平板型電池およびその製法
JP2003109669A (ja) * 2001-09-28 2003-04-11 Sanyo Electric Co Ltd 薄型電池
JP2003272598A (ja) * 2002-03-13 2003-09-26 Matsushita Electric Ind Co Ltd 非水電解液電池およびその製造方法
JP2004127599A (ja) * 2002-09-30 2004-04-22 Hitachi Maxell Ltd 非水電解質二次電池
JP2005209531A (ja) * 2004-01-23 2005-08-04 Toshiba Corp 非水電解質二次電池
JP2017126487A (ja) * 2016-01-14 2017-07-20 トヨタ自動車株式会社 電池

Similar Documents

Publication Publication Date Title
JP4165586B2 (ja) 電池パック
JP2007280617A (ja) 電池パック
US20120155001A1 (en) Secondary battery and portable electronic device
JP2013219027A (ja) 非水電解質二次電池
JP4797385B2 (ja) 電池パック
US11916207B2 (en) Battery cell including sealing tape for accelerating heat conduction
JP2012049089A (ja) 非水電解質二次電池
JP2014035897A (ja) 非水電解質二次電池
JP5119665B2 (ja) 電池パック
JP4639818B2 (ja) 電池パック
WO2021006171A1 (fr) Batterie
US20220045367A1 (en) Battery
WO2023283830A1 (fr) Appareil électrochimique et appareil électronique le comprenant
CN112335091B (zh) 锂离子二次电池
WO2020203038A1 (fr) Batterie
JP7306069B2 (ja) 電池
JP2007317668A (ja) 表示機能搭載型電子機器
CN112335092B (zh) 锂离子二次电池
JP6303780B2 (ja) 電池および電子機器
JP7459944B2 (ja) 二次電池
JP2009295489A (ja) 電池
JP5609949B2 (ja) 電池パック
WO2018168386A1 (fr) Batterie scellée, bloc-batterie et batterie pour allumage de moteur
JP2014035896A (ja) 非水電解質二次電池
KR20060095364A (ko) 음극 활물질층 및 이를 포함하는 리튬 이차 전지

Legal Events

Date Code Title Description
NENP Non-entry into the national phase

Ref country code: JP

122 Ep: pct application non-entry in european phase

Ref document number: 20837698

Country of ref document: EP

Kind code of ref document: A1