WO2021261478A1 - 封止フィルム、電極リード線部材および電池 - Google Patents

封止フィルム、電極リード線部材および電池 Download PDF

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Publication number
WO2021261478A1
WO2021261478A1 PCT/JP2021/023561 JP2021023561W WO2021261478A1 WO 2021261478 A1 WO2021261478 A1 WO 2021261478A1 JP 2021023561 W JP2021023561 W JP 2021023561W WO 2021261478 A1 WO2021261478 A1 WO 2021261478A1
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WO
WIPO (PCT)
Prior art keywords
adhesive layer
component
sealing film
lead wire
electrode lead
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/023561
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
俊輔 竹山
喬規 櫻木
敦史 目黒
崇 清水
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zacros Corp
Original Assignee
Fujimori Kogyo Co Ltd
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 Fujimori Kogyo Co Ltd filed Critical Fujimori Kogyo Co Ltd
Priority to KR1020227044576A priority Critical patent/KR20230012614A/ko
Priority to JP2022531997A priority patent/JP7801219B2/ja
Priority to US18/002,742 priority patent/US20230235198A1/en
Priority to CN202180044090.2A priority patent/CN115997318A/zh
Priority to EP21828577.3A priority patent/EP4170786A4/en
Priority to CA3183387A priority patent/CA3183387A1/en
Publication of WO2021261478A1 publication Critical patent/WO2021261478A1/ja
Anticipated expiration legal-status Critical
Priority to JP2025284110A priority patent/JP2026040755A/ja
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
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    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/197—Sealing members characterised by the material having a layered structure
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C09J123/10—Homopolymers or copolymers of propene
    • C—CHEMISTRY; METALLURGY
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    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C09J123/10—Homopolymers or copolymers of propene
    • C09J123/14—Copolymers of propene
    • C—CHEMISTRY; METALLURGY
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    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/26—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers modified by chemical after-treatment
    • C09J123/30—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers modified by chemical after-treatment by oxidation
    • C—CHEMISTRY; METALLURGY
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    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
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    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/74—Terminals, e.g. extensions of current collectors
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    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
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    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
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    • H—ELECTRICITY
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    • H01M50/10—Primary casings; Jackets or wrappings
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    • H01M50/129—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers with two or more layers of only organic material
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    • 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
    • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
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    • 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
    • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
    • H01M50/133—Thickness
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    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
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    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
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    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
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    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/571—Methods or arrangements for affording protection against corrosion; Selection of materials therefor
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/33—Applications of adhesives in processes or use of adhesives in the form of films or foils for batteries or fuel cells
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
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    • C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/414—Additional features of adhesives in the form of films or foils characterized by the presence of essential components presence of a copolymer
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/006—Presence of polyolefin in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
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    • C09J2423/00—Presence of polyolefin
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    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/16—Presence of ethen-propene or ethene-propene-diene copolymers
    • 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 a sealing film, an electrode lead wire member, and a battery.
  • Such a battery includes, for example, a battery body, a storage container for accommodating the battery body, and an electrode lead wire connected to the battery body.
  • the storage container is manufactured using a battery exterior laminate having excellent waterproof and light-shielding properties.
  • the battery exterior laminate is, for example, a laminate in which a base material layer made of polyamide or the like and an aluminum foil are laminated.
  • the electrode lead wire is sealed in the storage container in a state where the portion including one end is pulled out from the storage container.
  • the sealing film adheres the electrode lead wire and the container to prevent the formation of a gap between the container and the electrode lead wire. This prevents water from entering the inside of the storage container from the outside through the gap.
  • the sealing film (hereinafter referred to as a sealing film) has high adhesive strength to the electrode lead wire. Further, the sealing film is required to maintain the adhesive strength between the resin layers constituting the sealing film and suppress the peeling between the resin layers.
  • the present invention has been made in view of the above circumstances, and has high adhesive strength to the electrode lead wires, maintains the adhesive strength between the resin layers constituting the sealing film, and suppresses peeling between the resin layers. It is an object of the present invention to provide a sealing film, an electrode lead wire member, and a battery which can be used.
  • one aspect of the present invention includes the following aspects.
  • a sealing film for sealing between a first metal substrate and a second substrate which mainly contains an acid-modified polyolefin and contains a first adhesive layer to be adhered to the first substrate and a polyolefin.
  • a second adhesive layer mainly contained and adhered to the second substrate, and a substrate layer provided between the first adhesive layer and the second adhesive layer are provided, and the substrate layer includes the following ( A) component, (B) component and (C) component are included, and the ratio of the total amount of the (B) component and the (C) component to the (A) component [(A) / (B) + ( C)] is 90/10 to 20/80, and the content ratio of the component (B) to the total amount of the component (A), the component (B) and the component (C) is 5% by mass or more and 70% by mass.
  • the sealing film as follows, wherein the content ratio of the component (C) to the total amount of the component (A), the component (B) and the component (C) is 5% by mass or more and 70% by mass or less.
  • the sealing film according to [1] or [2], wherein the polyolefin constituting the second adhesive layer contains an acid-modified polyolefin.
  • the component (A) contains a polypropylene resin having a melting point of 150 ° C. or higher and 170 ° C. or lower, and the resin constituting the second adhesive layer is polypyrropylene or acid-modified polypropylene having a melting point of 110 ° C. or higher and 150 ° C. or lower.
  • An electrode lead wire member comprising the sealing film according to any one of [1] to [5] and the first substrate which is an electrode lead wire extending in one direction.
  • a battery comprising the electrode lead wire member according to [6], a battery main body to which the electrode lead wire is connected, and the second substrate which is a storage container for accommodating the battery main body.
  • the sealing film and the electrode lead wire have high adhesive strength to the electrode lead wire, maintain the adhesive strength between the resin layers constituting the sealing film, and suppress the peeling between the resin layers.
  • Members and batteries can be provided.
  • FIG. 3 is a cross-sectional view taken along the arrow in line segment I-I of FIG.
  • FIGS. 1 to 4 the sealing film, the electrode lead wire member, and the battery according to the embodiment will be described with reference to FIGS. 1 to 4.
  • the dimensions, ratios, etc. of the components may differ from the actual ones.
  • FIG. 1 is a schematic cross-sectional view showing the sealing film 1 of the embodiment.
  • FIG. 2 is a schematic perspective view showing the electrode lead wire member 10 of the embodiment.
  • the electrode lead wire member 10 includes an electrode lead wire 11 and a sealing film 1.
  • the electrode lead wire 11 is an example of a “first substrate”.
  • the sealing film 1 includes a first adhesive layer 2, a second adhesive layer 3, and a base material layer 4. Any layer other than the first adhesive layer 2, the second adhesive layer 3, and the base material layer 4 may be included as long as the effect of the present invention is not impaired.
  • the first adhesive layer 2 is a layer that is fused (adhered) to the electrode lead wire 11 (see FIG. 2) by heating or pressurizing.
  • the surface of the first adhesive layer 2 is one surface 1a of the sealing film 1.
  • the first adhesive layer 2 is a resin layer containing a resin.
  • the first adhesive layer 2 mainly contains acid-modified polyolefin.
  • the phrase "mainly containing acid-modified polyolefin" in the first adhesive layer 2 means that the content of the acid-modified polyolefin is the highest among the resins constituting the first adhesive layer 2.
  • the first adhesive layer 2 preferably contains 50% by mass or more of the acid-modified polyolefin (preferably, more than 50% by mass of the acid-modified polyolefin) with respect to the total amount of the first adhesive layer 2.
  • the first adhesive layer 2 preferably contains 80% by mass or more of the acid-modified polyolefin with respect to the total amount of the first adhesive layer 2.
  • the first adhesive layer 2 may contain 100% by mass of the acid-modified polyolefin with respect to the total amount of the first adhesive layer 2.
  • the first adhesive layer 2 "mainly contains acid-modified polyolefin" means that the first adhesive layer 2 contains 80% by mass or more of the acid-modified polyolefin with respect to the total amount of the first adhesive layer 2. There is an embodiment containing 100% by mass or less.
  • polystyrene examples include polypropylene, polyethylene, poly-1-butene, polyisobutylene and the like. Of these, polypropylene is preferable because it has excellent flexibility.
  • polypropylene may be abbreviated as "PP”.
  • the polyolefin may be a copolymer of propylene and ethylene (propylene-ethylene copolymer). Of these, a random copolymer of propylene and ethylene is preferable.
  • the polyolefin may be a copolymer of propylene and an olefin-based monomer. Examples of the olefin-based monomer include 1-butene, isobutylene, 1-hexene and the like.
  • the acid-modified polyolefin is a polyolefin-based resin modified with an unsaturated carboxylic acid or a derivative thereof, and is a resin having an acid functional group such as a carboxy group or an anhydrous carboxylic acid group in the polyolefin-based resin.
  • the acid-modified polyolefin can be obtained by modifying a polyolefin resin with an unsaturated carboxylic acid or a derivative thereof, or copolymerizing an acid functional group-containing monomer with olefins.
  • the adhesiveness of the first adhesive layer 2 to the electrode lead wire 11 can be enhanced.
  • acid-modified polypropylene As the acid-modified polyolefin, acid-modified polypropylene (acid-modified PP) is preferable because it has excellent heat resistance.
  • the acid-modified PP is, for example, a polymer obtained by graft-copolymerizing a monomer having a carboxy group with a polypropylene or propylene-ethylene copolymer.
  • Examples of the monomer having a carboxy group include unsaturated carboxylic acids such as acrylic acid and methacrylic acid; unsaturated carboxylic acid esters such as ethyl acrylate; and acid anhydrides such as maleic anhydride.
  • the acid-modified PP contains an ionomer in which the carboxylic acid group of the acid-modified polymer of polypropylene or the acid-modified polymer of propylene-ethylene copolymer is neutralized with a metal hydroxide, an alkoxide, a lower fatty acid salt or the like.
  • the acid group of the acid-modified PP is preferably a maleic anhydride group. That is, as the acid-modified PP, maleic anhydride-modified PP is preferable.
  • the resin constituting the first adhesive layer is preferably acid-modified polypropylene having a melting point of 110 ° C. or higher and 150 ° C. or lower.
  • the melting point of the resin constituting the first adhesive layer 2 is 110 ° C. or higher, the first adhesive layer 2 is less likely to become excessively thin during thermocompression bonding, and it is easy to secure the adhesive strength.
  • the melting point of the resin constituting the first adhesive layer 2 is 150 ° C. or lower, the resin easily flows during thermocompression bonding, so that the resin sufficiently wraps around the electrode lead wire 11 and the entire circumference of the electrode lead wire 11 Easy to seal.
  • the "melting point of the resin constituting the first adhesive layer 2" is the polymer alloy constituting the first adhesive layer 2. Means melting point.
  • Examples of the optional component other than the polyolefin in the first adhesive layer 2 include known additives such as stabilizers, antistatic agents, and colorants.
  • the thickness of the first adhesive layer 2 can be 5 or more and 90 or less, preferably 25 or more and 70 or less, assuming that the total thickness of the sealing film 1 is 100. That is, the thickness of the first adhesive layer 2 can be 5% or more and 90% or less of the total thickness of the sealing film 1, and is preferably 25% or more and 70% or less.
  • the ratio of the layer thickness when the total thickness of the sealing film 1 is 100 is called "thickness ratio".
  • the thickness ratio of the first adhesive layer 2 is at least the above lower limit value, the adhesive strength between the first adhesive layer 2 and the electrode lead wire 11 can be sufficiently secured.
  • the thickness ratio of the first adhesive layer 2 is not more than the above upper limit value, a sufficient thickness can be imparted to the second adhesive layer 3 and the base material layer 4.
  • the second adhesive layer 3 is a layer that is fused (adhered) to the container by heating or pressurizing, for example.
  • the containment container is an example of a second substrate.
  • the storage container will be described later.
  • the surface of the second adhesive layer 3 is the other surface 1b of the sealing film 1.
  • the second adhesive layer 3 is a resin layer containing a resin.
  • the second adhesive layer 3 mainly contains polyolefin.
  • the phrase "mainly containing polyolefin" in the second adhesive layer 3 means that the content of polyolefin is the highest among the resins constituting the second adhesive layer 3.
  • the second adhesive layer 3 preferably contains 50% by mass or more of polyolefin (preferably, more than 50% by mass of polyolefin) with respect to the total amount of the second adhesive layer 3.
  • the second adhesive layer 3 preferably contains 80% by mass or more of polyolefin with respect to the total amount of the second adhesive layer 3.
  • the second adhesive layer 3 may contain 100% by mass of the acid-modified polyolefin with respect to the total amount of the second adhesive layer 3.
  • the second adhesive layer 3 "mainly contains acid-modified polyolefin" means that the second adhesive layer 3 contains 80% by mass or more of the acid-modified polyolefin with respect to the total amount of the second adhesive layer 3. There is an embodiment containing 100% by mass or less.
  • Examples of the polyolefin constituting the second adhesive layer 3 include polypropylene (PP), polyethylene, poly-1-butene, polyisobutylene and the like. Among them, PP is preferable because it has excellent flexibility.
  • the polyolefin may be a copolymer of propylene and ethylene (propylene-ethylene copolymer). Of these, a random copolymer of propylene and ethylene is preferable.
  • the polyolefin may be a copolymer of propylene and an olefin-based monomer (for example, a random copolymer). Examples of the olefin-based monomer include 1-butene, isobutylene, 1-hexene and the like.
  • the polyolefin constituting the second adhesive layer 3 may be an acid-modified polyolefin.
  • acid-modified polyolefin acid-modified PP is preferable because it has excellent heat resistance.
  • acid-modified PP the acid-modified PP exemplified as the material of the first adhesive layer 2 described above is preferably used.
  • the acid-modified PP constituting the second adhesive layer 3 a polymer obtained by acid-modifying a random copolymer of propylene and ethylene is preferable because of its excellent flexibility.
  • the use of the acid-modified polyolefin makes it easy to enhance the adhesiveness of the second adhesive layer 3 to the storage container which is the second substrate.
  • the second adhesive layer 3 may contain both acid-modified PP and acid-modified polyethylene.
  • the melting point of the second adhesive layer 3 can be lowered and the heating temperature at the time of fusing the second adhesive layer 3 can be lowered. .. Therefore, it is possible to prevent the first adhesive layer 2 from deteriorating due to high temperature heating.
  • the resin constituting the second adhesive layer is preferably polypyrropylene or acid-modified polypropylene having a melting point of 110 ° C. or higher and 150 ° C. or lower.
  • the melting point of the resin constituting the second adhesive layer 3 is 110 ° C. or higher, the second adhesive layer 3 is less likely to become excessively thin during thermocompression bonding, and it is easy to secure the adhesive strength.
  • the melting point of the resin constituting the second adhesive layer 3 is 150 ° C. or lower, the resin tends to flow during thermocompression bonding, so that it is easy to seal between the container and the electrode lead wire 11.
  • the "melting point of the resin constituting the second adhesive layer 3" is the polymer alloy constituting the second adhesive layer 3. Means melting point.
  • Examples of the optional component other than the acid-modified polyolefin in the second adhesive layer 3 include known additives such as stabilizers, antistatic agents, and colorants.
  • the thickness (thickness ratio) of the second adhesive layer 3 can be 5 or more and 90 or less, preferably 10 or more and 50 or less, assuming that the total thickness of the sealing film 1 is 100. That is, the thickness of the second adhesive layer 3 can be 5% or more and 90% or less of the total thickness of the sealing film 1, and is preferably 10% or more and 50% or less.
  • the thickness ratio of the second adhesive layer 3 is at least the above lower limit value, it becomes easy to sufficiently secure the adhesive strength between the second adhesive layer 3 and the storage container which is the second substrate.
  • the thickness ratio of the second adhesive layer 3 is not more than the above upper limit value, sufficient thickness can be imparted to the first adhesive layer 2 and the base material layer 4. Therefore, it becomes easy to increase the adhesive strength between the first adhesive layer 2 and the electrode lead wire 11.
  • the base material layer 4 is provided between the first adhesive layer 2 and the second adhesive layer 3.
  • the base material layer 4 contains the following components (A), (B) and (C).
  • (B) Component Resin constituting the first adhesive layer.
  • (C) Component Resin constituting the second adhesive layer.
  • (A) component A resin different from the (B) component and the (C) component.
  • the ratio [(A) / (B) + (C)] of the total amount of the component (B) and the component (C) to the component (A) is 90/10 to 20/80.
  • the content ratio of the component (A) is at least the above lower limit value, a sufficient thickness can be imparted to the base material layer 4. Therefore, both the adhesive strength between the first adhesive layer 2 and the electrode lead wire 11 and the adhesive strength between the second adhesive layer 3 and the container can be increased.
  • the content ratio of the component (B) to the total amount of the component (A), the component (B) and the component (C) is 5% by mass or more and 70% by mass or less. Further, the content ratio of the component (C) with respect to the total amount of the component (A), the component (B) and the component (C) is 5% by mass or more and 70% by mass or less.
  • Examples of the component (B) include acid-modified polyolefins constituting the first adhesive layer.
  • Examples of the component (C) include polyolefins constituting the second adhesive layer.
  • the resin constituting the base material layer 4 contains a component (A), a component (B) and a component (C). Any component other than the component (A), the component (B) and the component (C) may be contained as long as the effect of the present embodiment is not impaired.
  • the resin constituting the base material layer 4 is preferably composed of the component (A), the component (B) and the component (C).
  • the resin constituting the base material layer 4 contains the component (B), the affinity between the base material layer 4 and the first adhesive layer 2 is likely to be improved. Therefore, the adhesive strength between the base material layer 4 and the first adhesive layer 2 can be easily maintained, and the peeling of the resins can be suppressed.
  • the resin constituting the base material layer 4 contains the component (C)
  • the affinity between the base material layer 4 and the second adhesive layer 3 can be easily improved. Therefore, the adhesive strength between the base material layer 4 and the second adhesive layer 3 can be easily maintained, and the peeling of the resins can be suppressed.
  • the content ratios of the component (B) and the component (C) in the resin constituting the base material layer 4 may be the same or different.
  • the component (B) and the component (C) are maintained from the viewpoint of maintaining the adhesive strength between the first adhesive layer and the base material layer and the adhesive strength between the second adhesive layer and the base material layer at the same level. It is preferable that the content ratios of the components are the same. Further, it does not prevent the component (B) and the component (C) from being the same.
  • polystyrene resin examples include polypropylene (PP), polyethylene, poly-1-butene, and polyisobutylene, which are different from the components (B) and (C).
  • PP is preferable because it has excellent flexibility.
  • the polyolefin as the component (A) may be a homopolymer of one kind of olefin or a copolymer of two or more kinds of olefins.
  • the homopolymer include a homopolymer containing only propylene (homogeneous PP).
  • the copolymer include a copolymer of propylene and an olefin-based monomer (ethylene, 1-butene, isobutylene, 1-hexene, etc.), for example, a propylene-ethylene copolymer.
  • ICP impact copolymer
  • the ICP has a phase-separated structure having a first phase and a second phase, for example, a sea-island structure.
  • the sea-island structure is a structure in which a plurality of second phases corresponding to "islands" are dispersed in a first phase corresponding to "sea”.
  • the first phase is composed of a homopolymer of an olefin-based monomer such as propylene or ethylene.
  • the second phase is composed of a polymer different from the homopolymer constituting the first phase.
  • the second phase contains, for example, a polymer of an olefinic monomer such as propylene or ethylene, for example, ethylene propylene rubber (EPR).
  • the second phase is composed of, for example, a main phase and a surface layer covering the surface of the main phase.
  • the main phase is composed of, for example, polyethylene.
  • the surface layer is composed of, for example, EPR.
  • ICP in which the homopolymer constituting the first phase is homoPP is called polypropylene ICP or polypropylene dispersion.
  • ICP in which the homopolymer constituting the first phase is homoPP is so-called block PP.
  • ICP is also referred to as a heterophasic copolymer, or block copolymer.
  • the thickness (thickness ratio) of the base material layer 4 can be 5 or more and 90 or less, preferably 25 or more and 70 or less, assuming that the total thickness of the sealing film 1 is 100. That is, the thickness of the base material layer 4 can be 5% or more and 90% or less of the total thickness of the sealing film 1, preferably 25% or more and 70% or less. When the thickness ratio of the base material layer 4 is at least the above lower limit value, the resin does not flow too much, and the fluidity required for crimping is likely to be exhibited.
  • the thickness ratio of the base material layer 4 is not more than the above upper limit value, a sufficient thickness can be imparted to the first adhesive layer 2. Therefore, the adhesive strength between the first adhesive layer 2 and the electrode lead wire 11 can be increased. Further, when the thickness ratio of the base material layer 4 is 90 or less, the fluidity of the resin does not decrease, and the fluidity of the resin at the time of thermocompression bonding can be controlled in an appropriate range.
  • the component (A) contained in the base material layer 4 preferably contains a polypropylene resin having a melting point of 150 ° C. or higher and 170 ° C. or lower.
  • a polypropylene resin having a melting point of 150 ° C. or higher and 170 ° C. or lower.
  • heat resistance can be imparted to the sealing film 1.
  • the sealing film 1 can be given flexibility. Therefore, a gap is less likely to occur between the electrode lead wire 11 and the sealing film 1.
  • the melting point M4 of the component (A) contained in the base material layer 4 is preferably higher than the melting point M2 of the resin constituting the first adhesive layer 2 or the melting point M3 of the resin constituting the second adhesive layer 3. That is, the melting point M4 is preferably higher than the melting point M2 or the melting point M3. It is desirable that the melting point M4 is higher than either the melting point M2 or the melting point M3. In one aspect of the invention, it is desirable that the melting point M4 is higher than at least one of the melting point M2 and the melting point M3.
  • Examples of the method for obtaining the resin film constituting the base material layer 4 include a method in which the components (A), (B) and (C) are melt-kneaded at a predetermined ratio and then extruded.
  • the electrode lead wire member 10 has an electrode lead wire 11 and a pair of sealing films 1.
  • the first adhesive layers 2 are arranged so as to face each other.
  • the pair of sealing films 1 sandwich the electrode lead wire 11.
  • the pair of sealing films 1 are in contact with one surface of the electrode lead wire 11 and a region corresponding to the other surface, respectively. Therefore, the pair of sealing films 1 are in contact with the entire circumference of the electrode lead wire 11 as a whole.
  • the electrode lead wire 11 has a lead wire main body 111 and a surface treatment layer 112.
  • the electrode lead wire 11 extends linearly in one direction.
  • the electrode lead wire 11 is made of metal.
  • the electrode lead wire 11 has conductivity.
  • the electrode lead wire 11 is electrically connected to the lithium ion battery 30 (see FIG. 3).
  • the electrode lead wire 11 energizes the lithium ion battery 30 and an external device.
  • known metals such as aluminum, copper, nickel, iron, gold, platinum, and various alloys can be used. Of these, aluminum or copper is preferable because it has excellent conductivity and is advantageous in terms of cost.
  • the surface of the lead wire body 111 may be nickel-plated.
  • the nickel plating of the lead wire main body 111 may be formed by electroplating using a watt bath containing nickel sulfate, nickel chloride, boric acid or the like as main components.
  • the nickel plating of the lead wire main body 111 is preferably performed using a nickel sulfamate plating bath containing nickel sulfamate and boric acid as main components. Since the plating film formed by this method has excellent flexibility, the plating film is less likely to crack.
  • the lead wire body 111 is preferably an aluminum plate or a nickel-plated copper plate.
  • the surface treatment layer 112 is formed on the surface of the lead wire main body 111.
  • the surface treatment layer 112 has corrosion resistance. "Corrosion resistance” refers to the property of being less susceptible to corrosion by the electrolytic solution inside the battery.
  • Examples of the surface treatment layer 112 include an acid-resistant film made of a phosphate, a chromate, a fluoride, a triazinethiol compound, or the like as a forming material.
  • the acid-resistant film can be formed by subjecting the lead wire body 111 to a chemical conversion treatment.
  • the surface-treated layer 112 is formed on a part of the surface of the lead wire main body 111, but the surface-treated layer 112 may be formed on the entire surface of the lead wire main body 111.
  • the electrode lead wire may not have a surface treatment layer formed.
  • the sealing film 1 Since the first adhesive layer 2, the base material layer 4, and the second adhesive layer 3 of the sealing film 1 have the above-mentioned structure, the adhesive strength to the electrode lead wire 11 is good. Further, the sealing film 1 can maintain the adhesive strength between the resin layers constituting the sealing film and suppress the peeling between the resin layers.
  • the sealing film 1 Since the sealing film 1 has good adhesive strength to the electrode lead wire 11, it is possible to prevent water from entering the inside of the container from the outside. Since the sealing film 1 can maintain the adhesive strength between the resin layers constituting the sealing film and suppress the peeling between the resin layers, it is possible to realize the battery 100 which is hard to deteriorate and has high reliability.
  • the sealing film 1 contains an acid-modified polyolefin as a material for forming the first adhesive layer 2. Therefore, the first adhesive layer 2 is easily heat-sealed with the electrode lead wire 11 and can seal the interface between the electrode lead wire 11 and the sealing film 1. Therefore, it is possible to prevent water from entering the inside of the storage container from the outside.
  • the sealing film 1 contains an acid-modified polyolefin as a material for forming the second adhesive layer 3. Therefore, the second adhesive layer 3 is easily heat-sealed with the resin material constituting the battery storage container, and the interface between the storage container and the sealing film 1 is easily sealed.
  • the electrode lead wire member 10 includes the sealing film 1, it is possible to prevent water from entering the container from the outside.
  • FIG. 3 is a schematic perspective view showing the battery 100 of the embodiment.
  • the battery 100 includes the electrode lead wire member 10 described above, a storage container 20, and a lithium ion battery 30 (battery body).
  • the storage container 20 has a container body 21 and a lid 22.
  • the storage container 20 is an example of a “second substrate”.
  • the container body 21 has a molded portion 21a that forms a recess for accommodating the lithium ion battery 30.
  • the container body 21 is obtained by drawing and molding a battery exterior laminate.
  • the lid 22 is made of a laminated body for battery exterior, and has a plan view area equivalent to that of the container body 21.
  • the battery exterior laminate will be described later.
  • the storage container 20 is formed by superimposing the container body 21 and the lid 22 and heat-sealing the peripheral edge portion 25.
  • FIG. 4 is a cross-sectional view taken along the line I-I of FIG.
  • the battery exterior laminate which is a constituent material of the container body 21 and the lid 22, has a first film base material 201, a second film base material 202, a metal foil 203, and a sealant layer 204 in this order. It is a laminated body laminated with.
  • the resin constituting the first film base material 201 and the second film base material 202 is not particularly limited, but polyamide, polyethylene terephthalate (PET), phenol resin, polypropylene and the like are suitable.
  • PET polyethylene terephthalate
  • metal foil 203 aluminum foil, stainless steel foil, copper foil, iron foil and the like are preferable.
  • the sealant layer 204 is in contact with the second adhesive layer 3 of the sealing film 1 and is heat-sealed.
  • a resin that can be fused with the sealing film 1 is selected.
  • the resin constituting the sealant layer 204 include polypropylene-based resin and polyethylene-based resin.
  • the polypropylene-based resin a polypropylene homopolymer, a propylene / ethylene copolymer, or the like can be used.
  • polyethylene-based resin low-density polyethylene, linear low-density polyethylene, or the like may be used.
  • the electrode lead wire 11 is drawn out from the lithium ion battery 30 inside the container 20 (inside the molded portion 21a) to the outside of the container 20.
  • the electrode lead wire 11 is fused with the sealant layer 204 of the container 20 via the sealing film 1.
  • the electrode lead wire member 10 since the electrode lead wire member 10 has the above-mentioned sealing film 1, it is possible to prevent water from entering the inside of the container from the outside. Therefore, it is possible to realize a battery 100 that is less likely to deteriorate and has high reliability.
  • the present invention is not limited to these examples.
  • the various shapes and combinations of the constituent members shown in the above-mentioned example are examples, and can be variously changed based on design requirements and the like within a range not deviating from the gist of the present invention.
  • the first adhesive layer and the second adhesive layer may contain a resin other than polyolefin.
  • a sealing film in which the first adhesive layer, the base material layer, and the second adhesive layer were laminated in this order was produced as follows.
  • the resin used as the raw material for each layer was separately heated and melted, and a laminated body was obtained by performing simultaneous multi-layer film formation using an extruder capable of simultaneous multi-layer extrusion molding. By cutting this laminate to a predetermined size, sealing films of each Example and Comparative Example were obtained.
  • the sealing film was formed in a strip shape (width 15 mm, thickness 150 ⁇ m).
  • the constituent materials of the first adhesive layer, the base material layer, and the second adhesive layer are as follows.
  • First adhesive layer maleic anhydride-modified polypropylene (melting point 140 ° C.). In Table 1, it is described as (B).
  • Second adhesive layer Random copolymer of propylene and ethylene (melting point 140 ° C.). In Table 1, it is described as (C).
  • Base material layer A resin composed of the above (B), the above (C) and (A).
  • (A) is polypropylene ICP (melting point 161 ° C.).
  • the melting point M4 of polypropylene ICP which is a resin constituting the base material layer, is higher than the melting point M2 of the resin constituting the first adhesive layer and the melting point M3 of the resin constituting the second adhesive layer.
  • Maleic anhydride-modified polypropylene is a polymer obtained by graft-polymerizing maleic anhydride on a random copolymer of propylene and ethylene.
  • Polypropylene ICP has a structure (sea island structure) in which the second phase is dispersed in the first phase.
  • the first phase is composed of homo-PP.
  • the second phase contains ethylene propylene rubber and polyethylene.
  • Polypropylene ICP is a mixture containing PP, ethylene propylene rubber and polyethylene.
  • Electrode lead wire having a lead wire main body and a surface treatment layer formed on the surface of the lead wire main body was produced.
  • As the lead wire main body a rectangular nickel-plated copper foil having a width of 45 mm and a length of 52 mm was used.
  • a PET film having a thickness of 12 ⁇ m, a nylon film having a thickness of 15 ⁇ m, an aluminum foil having a thickness of 40 ⁇ m, and a PP film having a thickness of 80 ⁇ m were laminated by dry laminating to obtain a laminated body for battery exterior.
  • the PET film, nylon film, aluminum foil, and PP film correspond to the first film base material 201, the second film base material 202, the metal foil 203, and the sealant layer 204, respectively (see FIG. 4).
  • the peel strength of the sealing film was measured by 180 degrees using a testing machine (desktop precision universal testing machine manufactured by Shimadzu Corporation: Autograph AGS-500NX).
  • a notch (half cut) with a depth of several tens of ⁇ m was made from the first adhesive layer side of the sealing film.
  • a cutter blade was inserted between the layers of the measurement sample, which is a laminate of the sealing film and the substrate film, and a part of the layer was peeled off.
  • the edge of the sealing film and the edge of the substrate film were gripped by the gripping portion of the testing machine, and the sealing film and the substrate film were peeled off in such a manner that the peeled layers were peeled by 180 degrees.
  • the peeling speed was 50 mm / min.
  • the adhesive strength of the sealing film to the electrode lead wire was measured as follows. The sealing film and the electrode lead wire were overlapped with each other, and the laminate obtained by adhering them by heat sealing was cut into strips (width 10 mm ⁇ length 120 mm) to obtain a sample for measurement. The conditions for heat sealing were 180 ° C., 0.5 MPa, and 10 seconds.
  • the 180-degree peel strength was measured as follows using a testing machine (desktop precision universal testing machine manufactured by Shimadzu Corporation: Autograph AGS-500NX).
  • the end of the sealing film and the end of the electrode lead wire were gripped by the gripping part of the testing machine, and the sealing film was peeled from the electrode lead wire under the condition of 180 degree peeling.
  • the peeling speed was set to 300 mm / min.
  • Electrode lead wire member 11 ... Electrode lead wire (first base material), 20 ... Containment container (No. 1) 2 substrates), 30 ... Lithium-ion battery (battery body), 100 ... Battery.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Organic Chemistry (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Inorganic Chemistry (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Laminated Bodies (AREA)
  • Connection Of Batteries Or Terminals (AREA)
PCT/JP2021/023561 2020-06-23 2021-06-22 封止フィルム、電極リード線部材および電池 Ceased WO2021261478A1 (ja)

Priority Applications (7)

Application Number Priority Date Filing Date Title
KR1020227044576A KR20230012614A (ko) 2020-06-23 2021-06-22 봉지 필름, 전극 리드선 부재, 및 전지
JP2022531997A JP7801219B2 (ja) 2020-06-23 2021-06-22 封止フィルム、電極リード線部材および電池
US18/002,742 US20230235198A1 (en) 2020-06-23 2021-06-22 Sealing Film, Electrode Lead Member, And Battery
CN202180044090.2A CN115997318A (zh) 2020-06-23 2021-06-22 封装膜、电极引线部件及电池
EP21828577.3A EP4170786A4 (en) 2020-06-23 2021-06-22 SEALING FILM, ELECTRODE CONDUCTIVE ELEMENT AND BATTERY
CA3183387A CA3183387A1 (en) 2020-06-23 2021-06-22 Sealing film, electrode lead member, and battery
JP2025284110A JP2026040755A (ja) 2020-06-23 2025-12-26 封止フィルム、電極リード線部材および電池

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