WO2019049485A1 - Batterie secondaire - Google Patents

Batterie secondaire Download PDF

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Publication number
WO2019049485A1
WO2019049485A1 PCT/JP2018/024997 JP2018024997W WO2019049485A1 WO 2019049485 A1 WO2019049485 A1 WO 2019049485A1 JP 2018024997 W JP2018024997 W JP 2018024997W WO 2019049485 A1 WO2019049485 A1 WO 2019049485A1
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WIPO (PCT)
Prior art keywords
layer
positive electrode
negative electrode
insulating tape
secondary battery
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PCT/JP2018/024997
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English (en)
Japanese (ja)
Inventor
一洋 吉井
貴夫 佐藤
Original Assignee
パナソニックＩｐマネジメント株式会社
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Publication of WO2019049485A1 publication Critical patent/WO2019049485A1/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
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/643—Cylindrical cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/651—Means for temperature control structurally associated with the cells characterised by parameters specified by a numeric value or mathematical formula, e.g. ratios, sizes or concentrations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6553—Terminals or leads
    • 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
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • 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
    • H01M50/572—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
    • H01M50/595—Tapes
    • 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 disclosure relates to a secondary battery.
  • a lithium secondary battery has been proposed in which the insulation properties of the positive electrode or the negative electrode are improved by using an insulating tape.
  • Patent Document 1 discloses a non-aqueous electrolyte secondary battery including an insulating tape having a multilayer structure including an organic material layer mainly composed of an organic material and a composite material layer containing an organic material and an inorganic material. ing.
  • the secondary battery according to one aspect of the present disclosure is a secondary battery including an electrode body in which a positive electrode and a negative electrode are stacked via a separator, wherein the positive electrode and the negative electrode are a current collector, and the current collector.
  • the insulating tape includes an insulating tape attached to at least one side, and the insulating tape is interposed between a substrate layer made of an insulating organic material, an adhesive layer, the substrate layer, and the adhesive layer.
  • a thermally conductive layer containing at least one of a carbonaceous filler and a metallic filler as the thermally conductive filler.
  • the secondary battery according to another aspect of the present disclosure is a secondary battery including an electrode body in which a positive electrode and a negative electrode are stacked via a separator, wherein the positive electrode and the negative electrode are a current collector, and the collector is A composite material layer formed on a current collector, and an electrode lead connected to an exposed portion where the surface of the current collector is exposed, wherein at least one of the positive electrode and the negative electrode, the electrode lead and the exposure Between the base material layer made of an insulating organic material, an adhesive layer, the base material layer, and the adhesive layer. And a thermally conductive layer made of metal foil.
  • internal short circuit can be suppressed while maintaining good battery performance. Further, even if an internal short circuit occurs, the rise in battery temperature can be suppressed.
  • the secondary battery according to the present disclosure uses a thermally conductive layer containing at least one of a carbon-based filler and a metal filler or an insulating tape having a thermally conductive layer composed of a metal foil to maintain good battery performance while maintaining good battery performance.
  • the heat generation due to the short circuit can be highly suppressed. Since the carbon-based filler, the metal filler, and the metal foil hardly adsorb moisture, the insulating tape does not increase the amount of moisture in the battery. For this reason, in the secondary battery according to the present disclosure, a failure due to the intrusion of moisture is unlikely to occur, and good battery performance is maintained. In addition, the fall of the discharge capacity when it preserve
  • the battery case is, for example, a resin made of a square metal case (square battery) and a resin film. It may be a case (laminated battery) or the like.
  • FIG. 1 is a cross-sectional view of a secondary battery 10 which is an example of the embodiment.
  • the secondary battery 10 includes an electrode body 14, an electrolyte (not shown), and a battery case that accommodates the electrode body 14 and the electrolyte.
  • a preferred example of the secondary battery 10 is a lithium ion battery.
  • the electrode body 14 has a wound structure in which the positive electrode 11 and the negative electrode 12 are wound via the separator 13.
  • the battery case is configured of a bottomed cylindrical case main body 15 and a sealing body 16 that closes the opening of the main body.
  • the electrolyte comprises a solvent and an electrolyte salt dissolved in the solvent.
  • the solvent for example, nonaqueous solvents such as esters, ethers, nitriles, amides, and mixed solvents of two or more of them, and water may be used.
  • the solvent may contain a halogen substitute wherein at least a part of hydrogen of these solvents is substituted with a halogen atom such as fluorine.
  • the electrolyte is not limited to the liquid electrolyte, and may be a solid electrolyte using a gel polymer or the like.
  • a lithium salt such as LiPF 6 is used for example.
  • the secondary battery 10 includes insulating plates 17 and 18 disposed above and below the electrode body 14.
  • the positive electrode lead 19 extends through the through hole of the insulating plate 17 toward the sealing body 16
  • the negative electrode lead 20 extends through the outside of the insulating plate 18 toward the bottom of the case body 15.
  • the positive electrode lead 19 is connected to the lower surface of the filter 22 which is a bottom plate of the sealing member 16 by welding or the like, and a cap 26 which is a top plate of the sealing member 16 electrically connected to the filter 22 serves as a positive electrode terminal.
  • the negative electrode lead 20 is connected to the inner surface of the bottom of the case main body 15 by welding or the like, and the case main body 15 becomes a negative electrode terminal.
  • the case main body 15 is, for example, a metal container with a bottomed cylindrical shape.
  • a gasket 27 is provided between the case main body 15 and the sealing body 16 to ensure the airtightness inside the battery case.
  • the case main body 15 has an overhanging portion 21 for supporting the sealing body 16 which is formed, for example, by pressing the side surface portion from the outside.
  • the projecting portion 21 is preferably formed in an annular shape along the circumferential direction of the case main body 15, and the sealing member 16 is supported on the upper surface thereof.
  • the sealing body 16 has a structure in which the filter 22, the lower valve body 23, the insulating member 24, the upper valve body 25, and the cap 26 are sequentially stacked from the electrode body 14 side.
  • Each member which comprises the sealing body 16 has disk shape or ring shape, for example, and each member except the insulation member 24 is electrically connected mutually.
  • the lower valve body 23 and the upper valve body 25 are connected to each other at their central portions, and an insulating member 24 is interposed between the respective peripheral edge portions. Since the lower valve body 23 is provided with a vent, if the internal pressure of the battery rises due to abnormal heat generation, the upper valve body 25 bulges to the cap 26 side and separates from the lower valve body 23 so that the electrical connection between them is achieved. It is cut off. When the internal pressure further increases, the upper valve body 25 is broken, and the gas is discharged from the opening of the cap 26.
  • FIG. 2 is a front view of the positive electrode 11 and the negative electrode 12 constituting the electrode assembly 14, and the right side of the drawing is the core side.
  • the negative electrode 12 is formed larger than the positive electrode 11 in order to prevent deposition of lithium on the negative electrode 12, and the negative electrode current collector 35 of the negative electrode 12 A current collector longer in width and wider than the positive electrode current collector 30 is used. Then, at least a portion where the positive electrode mixture layer 31 of the positive electrode 11 is formed is opposed to a portion where the negative electrode mixture layer 36 of the negative electrode 12 is formed via the separator 13.
  • the positive electrode 11 includes a positive electrode current collector 30, a positive electrode mixture layer 31 formed on the positive electrode current collector 30, and a positive electrode lead 19 connected to the exposed portion 32 where the surface of the positive electrode current collector 30 is exposed.
  • the positive electrode mixture layer 31 is formed on both surfaces of the strip-shaped positive electrode current collector 30.
  • a foil of a metal such as aluminum, a film in which the metal is disposed on the surface, or the like is used.
  • the thickness of the positive electrode current collector 30 is, for example, 5 ⁇ m to 30 ⁇ m.
  • the positive electrode mixture layer 31 is preferably formed on the entire surface of the positive electrode current collector 30 except for the exposed portion 32.
  • the positive electrode mixture layer 31 contains a positive electrode active material, a conductive material such as carbon black or acetylene black, and a binder such as polyvinylidene fluoride (PVdF).
  • a positive electrode active material lithium metal complex oxide containing metallic elements, such as Co, Mn, Ni, and Al, can be illustrated.
  • the positive electrode 11 applies a positive electrode mixture slurry containing a positive electrode active material, a conductive material, a binder, and a dispersion medium such as N-methyl-2-pyrrolidone (NMP) on both sides of the positive electrode current collector 30, and the coating is compressed.
  • NMP N-methyl-2-pyrrolidone
  • the exposed portion 32 is a portion in which the surface of the positive electrode current collector 30 is not covered by the positive electrode mixture layer 31.
  • the exposed portion 32 is formed wider than the positive electrode lead 19, for example, across the entire width of the positive electrode 11.
  • the exposed portions 32 are preferably provided on both sides of the positive electrode 11 so as to overlap in the thickness direction of the positive electrode 11. In the example shown in FIG. 2, one exposed portion 32 is provided on one side of the positive electrode 11 at the central portion in the longitudinal direction of the positive electrode 11.
  • the negative electrode 12 includes a negative electrode current collector 35, a negative electrode mixture layer 36 formed on the negative electrode current collector 35, and a negative electrode lead 20 connected to the exposed portion 37 where the surface of the negative electrode current collector 35 is exposed.
  • the negative electrode mixture layer 36 is formed on both sides of the strip-like negative electrode current collector 35.
  • a foil of a metal such as copper, a film in which the metal is disposed on the surface, or the like is used.
  • the thickness of the negative electrode current collector 35 is, for example, 5 ⁇ m to 30 ⁇ m.
  • the negative electrode mixture layer 36 is preferably formed on the entire surface of the negative electrode current collector 35 except for the exposed portion 37.
  • the negative electrode mixture layer 36 contains a negative electrode active material and a binder such as styrene-butadiene rubber (SBR).
  • SBR styrene-butadiene rubber
  • the negative electrode active material is not particularly limited as long as it can occlude and release lithium ions reversibly, for example, carbon materials such as natural graphite and artificial graphite, metals alloyed with lithium such as Si and Sn, or these Alloys, complex oxides, etc. can be used.
  • the negative electrode 12 can be prepared by applying a negative electrode mixture slurry containing a negative electrode active material, a binder, water, and the like on both sides of the negative electrode current collector 35 and compressing the coating film.
  • the exposed portion 37 is a portion where the surface of the negative electrode current collector 35 is not covered by the negative electrode mixture layer 36.
  • the exposed portion 37 is formed wider than the negative electrode lead 20, for example, across the entire width of the negative electrode 12.
  • one exposed portion 37 is provided on one side of the negative electrode 12 at one end in the longitudinal direction of the negative electrode 12 and located on the winding outer side of the electrode body 14.
  • the exposed portion 37 may be provided at the end of the negative electrode 12 (the other end in the longitudinal direction of the negative electrode 12) located on the winding core side of the electrode body 14 and provided at both longitudinal ends of the negative electrode 12 May be
  • the positive electrode lead 19 and the negative electrode lead 20 are strip-like conductive members that are thicker than the current collector and the mixture layer.
  • the thickness of the lead is, for example, 50 ⁇ m to 500 ⁇ m.
  • the constituent material of each lead is not particularly limited, but it is preferable that the positive electrode lead 19 be made of a metal whose main component is aluminum, and the negative electrode lead 20 be a metal whose main component is nickel or copper.
  • the number, arrangement, and the like of the leads are not particularly limited.
  • the secondary battery 10 includes an insulating tape 40 attached to at least one of the electrode lead and the exposed portion in at least one of the positive electrode 11 and the negative electrode 12.
  • the insulating tape 40 is preferably attached to at least a part of a portion (hereinafter, may be referred to as a “base”) located on the current collector among the electrode leads.
  • the base of the electrode lead is generally welded to the exposed portions 32, 37, but the whole may not be welded.
  • a part of the positive electrode lead 19 extends from the upper end of the positive electrode current collector 30 and is connected to the sealing member 16, and a part of the negative electrode lead 20 extends from the lower end of the negative electrode current collector 35 and the bottom of the case main body 15 It is connected to the inner surface (hereinafter, a part of the part may be referred to as an “extension part”).
  • the insulating tape 40 is attached to both the positive electrode 11 and the negative electrode 12, and at least a part of the base of each electrode lead is covered with the insulating tape 40.
  • the insulating tape 40 may be attached only to the positive electrode 11, and a conventionally known insulating tape not having a heat conductive layer 43 described later may be attached to the negative electrode 12. Further, instead of the insulating tape 40, an insulating tape 50 described later may be used.
  • the insulating tape 40 has, for example, a rectangular shape (strip shape) in a front view wider than the electrode leads.
  • the insulating tape 40 is preferably attached to cover the entire base of the electrode lead. In the example shown in FIG. 2, the entire base of the positive electrode lead 19 and the entire exposed portion 32 are covered with the insulating tape 40.
  • a part of the insulating tape 40 is attached also on the positive electrode mixture layer 31 formed on both sides of the exposed portion 32.
  • the insulating tape 40 is preferably further adhered to the other exposed portion 32 formed on the opposite side of the exposed portion 32 to which the positive electrode lead 19 is welded. That is, the insulating tape 40 is adhered to both surfaces of the positive electrode 11 so as to cover the exposed portions 32.
  • the insulating tape 40 may be attached to the base of the extension of the positive electrode lead 19 beyond the range of the positive electrode current collector 30.
  • the base portion of the extended portion of the positive electrode lead 19 faces the negative electrode 12 through the separator 13, so there is a concern that the internal short circuit may occur due to the melting of the separator 13. Therefore, it is preferable that the insulating tape 40 be stuck also to the said root part.
  • the insulating tape 40 is attached to the negative electrode lead 20 and the exposed portion 37 as in the case of the positive electrode 11, but in the example shown in FIG. 2, the entire base of the negative electrode lead 20 and a part of the exposed portion 37 It is covered and stuck.
  • FIG. 3 is a view showing the electrode 60 to which the insulating tape 40 is attached, where (a) is a front view and (b) is a cross-sectional view taken along line AA in (a).
  • the electrode 60 may be either a positive electrode or a negative electrode.
  • the insulating tape 40 may be attached to the electrode 60 along the boundary between the mixture layer 62 and the exposed portion 63 of the current collector 61 so as to cover the boundary. Good.
  • the insulating tape 40 is attached across the end of the mixture layer 62 and the exposed portion 63.
  • the insulating tape 40 may be attached to only one side of the electrode 60 or may be attached to both sides.
  • FIG. 4 is a cross-sectional view of an insulating tape 40 which is an example of the embodiment.
  • the insulating tape 40 is interposed between the base layer 41 made of an insulating organic material, the adhesive layer 42, and the base layer 41 and the adhesive layer 42,
  • a thermally conductive layer 43 containing at least one of a carbon-based filler and a metal filler is provided as the thermally conductive filler.
  • the content of the thermally conductive filler is preferably 25% by volume or more with respect to the volume of the thermally conductive layer 43.
  • the insulating tape 40 suppresses an internal short circuit without affecting the battery performance.
  • the thickness of the insulating tape 40 is, for example, 10 to 60 ⁇ m, and preferably 15 to 40 ⁇ m.
  • the thickness of the insulating tape 40 and each layer can be measured by cross-sectional observation using a scanning electron microscope (SEM).
  • SEM scanning electron microscope
  • the insulating tape 40 may have a layer structure of four or more layers.
  • the base material layer 41 is not limited to a single layer structure, and may be constituted by two or more layers of the same or different laminated films.
  • the base layer 41 is preferably substantially made of only an organic material.
  • the ratio of the organic material to the constituent material of the base material layer 41 is, for example, 90% by weight or more, preferably 95% by weight or more, or 100% by weight.
  • the main component of the organic material is preferably a resin which is excellent in insulation, electrolyte resistance, heat resistance, puncture strength and the like.
  • the thickness of the base layer 41 is, for example, 5 to 50 ⁇ m, preferably 15 to 35 ⁇ m.
  • polyesters such as a polyethylene terephthalate (PET), a polypropylene (PP), a polyimide (PI), polyphenylene sulfide (PPS), a polyether imide (PEI), a polyamide etc.
  • PET polyethylene terephthalate
  • PP polypropylene
  • PI polyimide
  • PPS polyphenylene sulfide
  • PEI polyether imide
  • a polyamide a polyamide
  • One of these may be used alone, or two or more of these may be used in combination.
  • polyimide having high mechanical strength (piercing strength) is particularly preferable.
  • a resin film made of polyimide can be used for example.
  • the adhesive layer 42 is a layer for providing the insulating tape 40 with adhesiveness to the positive electrode lead 19.
  • the adhesive layer 42 is formed, for example, by applying an adhesive on one surface of the base layer 41 on which the heat conductive layer 43 is formed.
  • the adhesive layer 42 is preferably configured using an adhesive (resin) that is excellent in insulation properties, electrolytic solution resistance, and the like.
  • the adhesive constituting the adhesive layer 42 may be a hot melt type which exhibits adhesiveness by heating or a thermosetting type which cures by heating, but from the viewpoint of productivity etc. It is preferable to have.
  • An example of the adhesive constituting the adhesive layer 42 is an acrylic adhesive or a synthetic rubber adhesive.
  • the adhesive layer 42 has a thickness of, for example, 3 to 20 ⁇ m.
  • the heat conductive layer 43 is a layer containing at least one of a carbon-based filler and a metal filler as a heat conductive filler as described above.
  • the thermally conductive layer 43 is a composite layer composed of a thermally conductive filler and an organic material, and has a layer structure in which the thermally conductive filler is dispersed in a matrix made of an organic material, or a thermally conductive filler is an organic material. Have a layered structure formed by bonding.
  • the heat conductive layer 43 is formed, for example, by dispersing a heat conductive filler in an organic material, applying it to the surface of the resin film constituting the base layer 41, and curing the coating film. Alternatively, it is formed by dispersing a thermally conductive filler in a solution of an organic material, applying the solution to the surface of a resin film, evaporating off the solvent, and drying the coating.
  • the preferred thickness of the heat conduction layer 43 is 1 to 10 ⁇ m. In this case, it becomes easy to secure sufficient heat dissipation and heat resistance.
  • the content of the thermally conductive filler is preferably 25 to 70% by volume, more preferably 25 to 50% by volume, with respect to the volume of the thermally conductive layer 43. If the content of the thermally conductive filler is within the above range, a good heat transfer path is formed, and the thermally conductive layer 43 excellent in thermal conductivity is formed.
  • the base layer 41 is provided, and the thermally conductive layer 43 is interposed between the base layer 41 and the adhesive layer 42, whereby the amount of the thermally conductive filler added to the thermally conductive layer 43 is increased. However, good stab strength can be secured.
  • a suitable carbonaceous filler which constitutes heat conduction layer 43 it is at least one sort chosen from diamond, graphite, and carbon fiber. These have high thermal conductivity and improve the heat dissipation function of the thermal conductive layer 43. When a particulate carbon-based filler is used, the average particle size is preferably 1 ⁇ m or less.
  • the heat conduction layer 43 may contain one or more carbon-based fillers, and may contain metal fillers in addition to the carbon-based fillers.
  • Preferred metal fillers are composed of metals based on at least one selected from aluminum, titanium, silicon, magnesium, and stainless steel. These have good chemical stability in the electrolyte and are also excellent in thermal conductivity.
  • the main component means a component having the largest weight among the metal components constituting the metal filler (the same applies to metal foil described later).
  • the metal filler may be made of, for example, an alloy such as an aluminum alloy, or may be made of only one metal such as aluminum.
  • the shape of the metal filler is not particularly limited, and may be granular, needle-like, plate-like or fibrous.
  • the heat conduction layer 43 may contain one or more metal fillers.
  • the organic material (resin) constituting the heat conduction layer 43 is excellent in insulation, electrolyte resistance, etc., and has good adhesion to the base material layer 41.
  • suitable resins include acrylic resins, epoxy resins, urethane resins, and fluorine resins such as PVdF. One of these may be used alone, or two or more of these may be used in combination.
  • FIG. 5 is a cross-sectional view of an insulating tape 50 which is another example of the embodiment.
  • the same components as those of the insulating tape 40 shown in FIG. 4 are denoted by the same reference numerals.
  • the insulating tape 50 includes a base layer 41, an adhesive layer 42, and a thermally conductive layer 53 made of metal foil interposed between the base layer 41 and the adhesive layer 42.
  • the configuration of the insulating tape 50 differs from the configuration of the insulating tape 40 in that the heat conductive layer 53 is provided instead of the heat conductive layer 43. Even when the insulating tape 50 is used, the same function and effect as the case where the insulating tape 40 is used can be obtained.
  • the preferred thickness of the heat conduction layer 53 is 1 to 10 ⁇ m.
  • the heat conduction layer 53 is formed using a metal foil having a thickness of 1 to 10 ⁇ m.
  • the insulating tape 50 is formed, for example, by applying a solution of the resin forming the base layer 41 on the metal foil forming the heat conductive layer 53 and drying the coating film.
  • the base layer 41 may be formed by applying an uncured resin on a metal foil and curing the coating.
  • the metal foil constituting the heat conduction layer 53 and the resin film constituting the base layer 41 may be bonded using an adhesive.
  • a preferred metal foil constituting the heat conduction layer 53 is composed of a metal whose main component is at least one selected from aluminum, titanium, silicon, magnesium and stainless steel. These have good chemical stability in the electrolyte and are also excellent in thermal conductivity.
  • the metal foil may be made of, for example, an alloy foil such as an aluminum alloy, or may be made of only one kind of metal foil such as aluminum.
  • Example 1 [Create positive electrode] 100 parts by weight of lithium nickel cobalt aluminum complex oxide represented by LiNi 0.88 Co 0.09 Al 0.03 O 2 as a positive electrode active material, 1 part by weight of acetylene black (AB), and 1 part by weight of polyvinylidene fluoride (PVdF) And a proper amount of N-methyl-2-pyrrolidone (NMP) to prepare a positive electrode mixture slurry. Next, the positive electrode mixture slurry was applied to both sides of a positive electrode current collector made of aluminum foil, and the coating was dried.
  • LiNi 0.88 Co 0.09 Al 0.03 O 2 a positive electrode active material
  • PVdF polyvinylidene fluoride
  • NMP N-methyl-2-pyrrolidone
  • the current collector on which the coating film was formed was compressed using a roller, and then cut into a predetermined electrode size to prepare a positive electrode in which a positive electrode mixture layer was formed on both sides of the positive electrode current collector.
  • An exposed portion in which the mixture layer was not formed at the central portion in the longitudinal direction of the positive electrode and the current collector surface was exposed was provided, and a positive electrode lead made of aluminum was ultrasonically welded to the exposed portion.
  • An insulating tape was attached to the positive electrode so as to cover the base of the positive electrode lead, the base of the extension, and each exposed portion.
  • the layer configuration of the insulating tape is as follows.
  • Base material layer 25 ⁇ m thick polyimide film
  • Adhesive layer 7 ⁇ m thick acrylic adhesive layer
  • Thermal conductive layer 1 ⁇ m thick composite layer composed of 25 volume% of diamond filler and 75 volume% of acrylic resin Creation of] Mix 98 parts by weight of graphite powder, 1 part by weight of sodium carboxymethylcellulose (CMC-Na), and 1 part by weight of styrene-butadiene rubber (SBR), add an appropriate amount of water, and mix the negative electrode slurry Prepared. Next, the negative electrode mixture slurry was applied to both sides of a negative electrode current collector made of copper foil, and the coating was dried.
  • CMC-Na sodium carboxymethylcellulose
  • SBR styrene-butadiene rubber
  • the current collector on which the coating film was formed was compressed using a roller, and then cut into a predetermined electrode size to prepare a negative electrode in which a negative electrode mixture layer was formed on both sides of the negative electrode current collector.
  • An exposed portion in which the mixture layer was not formed at one longitudinal end portion (portion to be the winding outer end portion) of the negative electrode and the current collector surface was exposed was provided, and a nickel negative electrode lead was ultrasonically welded to the exposed portion.
  • the above-mentioned insulating tape was stuck to the negative electrode so as to cover the base of the negative electrode lead, the root portion of the extending portion, and each exposed portion.
  • Ethylene carbonate (EC), ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC) were mixed in a volume ratio of 3: 3: 4.
  • LiPF 6 was dissolved at a concentration of 1 mol / L to prepare a non-aqueous electrolyte.
  • a winding type electrode body is formed by spirally winding the positive electrode and the negative electrode through a separator made of a porous film made of polyethylene having a heat resistant layer in which fillers of polyamide and alumina are dispersed on one side. did.
  • the extension of the positive electrode lead is used as a filter of the sealing body and the extension of the negative electrode lead is Each was welded to the bottom inner surface. Then, the non-aqueous electrolyte was injected into the case main body, and the opening of the case main body was closed with a sealing member, to prepare a 18650 type cylindrical battery.
  • Example 2 A cylindrical battery was produced in the same manner as in Example 1 except that the heat conduction layer of the insulating tape used in Example 1 was as shown in Table 1.
  • Example 7 A cylindrical battery was produced in the same manner as in Example 1, except that the insulating tape used in Example 1 was replaced by an insulating tape having the following layer structure.
  • Example 8 A cylindrical battery was produced in the same manner as in Example 7 except that the heat conduction layer of the insulating tape used in Example 7 was changed to that shown in Table 1.
  • Comparative Example 1 A cylindrical battery was produced in the same manner as in Example 1, except that the insulating tape used in Example 1 was replaced by an insulating tape having the following layer structure.
  • the amount of water contained in the insulating tape used for each battery was measured using the Karl Fischer method.
  • the heating temperature was 150.degree.
  • the battery temperature at the time of the foreign matter short circuit was lower than that of the battery of the comparative example.
  • the heat generated in the short circuit can be diffused quickly by the function of the heat conduction layer of the insulating tape, which leads to the suppression of the rise of the battery temperature. That is, the heat dissipating function of the heat conduction layer can suppress the deformation and deterioration of the base material layer and the separator, and can suppress the increase in battery temperature due to the expansion of the short circuit portion.

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Abstract

L'invention concerne une batterie secondaire comportant : un corps d'électrode qui est obtenu par stratification d'une électrode positive et d'une électrode négative, un séparateur étant intercalé entre elles ; un électrolyte ; et une bande isolante qui est liée à l'électrode positive et/ou à l'électrode négative. La bande isolante comprend : une couche de matériau de base qui est configurée à partir d'un matériau organique isolant ; une couche adhésive ; et une couche de conduction thermique qui est intercalée entre la couche de matériau de base et la couche adhésive et qui contient, en tant que charge thermoconductrice, une charge à base de carbone et/ou une charge métallique.
PCT/JP2018/024997 2017-09-11 2018-07-02 Batterie secondaire WO2019049485A1 (fr)

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JP2017-173887 2017-09-11

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021251121A1 (fr) * 2020-06-09 2021-12-16 株式会社村田製作所 Batterie secondaire, dispositif électronique et outil électrique
JP2022553025A (ja) * 2019-10-28 2022-12-21 エルジー エナジー ソリューション リミテッド 電極組立体およびそれを含む二次電池

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0313964Y2 (fr) * 1986-05-13 1991-03-28
JP2010003697A (ja) * 2008-06-23 2010-01-07 Samsung Sdi Co Ltd 電極組立体及びこれを用いたリチウム二次電池
JP2010055906A (ja) * 2008-08-28 2010-03-11 Sanyo Electric Co Ltd 非水電解質二次電池
JP2012156093A (ja) * 2011-01-28 2012-08-16 Sanyo Electric Co Ltd 非水電解液二次電池
WO2016121339A1 (fr) * 2015-01-29 2016-08-04 三洋電機株式会社 Batterie rechargeable à électrolyte non aqueux
WO2017038010A1 (fr) * 2015-08-31 2017-03-09 パナソニックＩｐマネジメント株式会社 Batterie rechargeable à électrolyte non aqueux

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0313964Y2 (fr) * 1986-05-13 1991-03-28
JP2010003697A (ja) * 2008-06-23 2010-01-07 Samsung Sdi Co Ltd 電極組立体及びこれを用いたリチウム二次電池
JP2010055906A (ja) * 2008-08-28 2010-03-11 Sanyo Electric Co Ltd 非水電解質二次電池
JP2012156093A (ja) * 2011-01-28 2012-08-16 Sanyo Electric Co Ltd 非水電解液二次電池
WO2016121339A1 (fr) * 2015-01-29 2016-08-04 三洋電機株式会社 Batterie rechargeable à électrolyte non aqueux
WO2017038010A1 (fr) * 2015-08-31 2017-03-09 パナソニックＩｐマネジメント株式会社 Batterie rechargeable à électrolyte non aqueux

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022553025A (ja) * 2019-10-28 2022-12-21 エルジー エナジー ソリューション リミテッド 電極組立体およびそれを含む二次電池
JP7387977B2 (ja) 2019-10-28 2023-11-29 エルジー エナジー ソリューション リミテッド 電極組立体およびそれを含む二次電池
WO2021251121A1 (fr) * 2020-06-09 2021-12-16 株式会社村田製作所 Batterie secondaire, dispositif électronique et outil électrique
JP7396481B2 (ja) 2020-06-09 2023-12-12 株式会社村田製作所 二次電池、電子機器及び電動工具

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