WO2021241560A1 - 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 PDFInfo
- Publication number
- WO2021241560A1 WO2021241560A1 PCT/JP2021/019758 JP2021019758W WO2021241560A1 WO 2021241560 A1 WO2021241560 A1 WO 2021241560A1 JP 2021019758 W JP2021019758 W JP 2021019758W WO 2021241560 A1 WO2021241560 A1 WO 2021241560A1
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- WO
- WIPO (PCT)
- Prior art keywords
- adhesive layer
- sealing film
- lead wire
- electrode lead
- base material
- Prior art date
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- 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
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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
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
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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
- H01M50/543—Terminals
- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
- H01M50/557—Plate-shaped terminals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/06—Coating on the layer surface on metal layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/20—Inorganic coating
- B32B2255/205—Metallic coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
- B32B2307/737—Dimensions, e.g. volume or area
- B32B2307/7375—Linear, e.g. length, distance or width
- B32B2307/7376—Thickness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/10—Batteries
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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
- 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
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/12—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
- 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
- C09J2301/1242—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 the opposite adhesive layers being different
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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
- C09J2423/00—Presence of polyolefin
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- 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.
- the storage 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 by 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 (hereinafter referred to as a sealing film) preferably has high adhesive strength to the electrode lead wire and the container. Further, since the sealing film may come into contact with the electrolytic solution in the container, resistance to the electrolytic solution is required. That is, the sealing film is required to have the following three characteristics. (I) Adhesive strength to the electrode lead wire (first substrate). (Ii) Adhesive strength to the container (second substrate). (Iii) Resistance to electrolytic solution.
- One aspect of the present invention is to provide a sealing film, an electrode lead wire member, and a battery having high adhesive strength to the first substrate and the second substrate and having resistance to an electrolytic solution.
- 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 has 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 base material layer provided between the first adhesive layer and the second adhesive layer are provided, and the thickness of the first adhesive layer is provided. Is 25 or more and 70 or less, where the total thickness of the sealing film is 100, and the thickness of the base material layer is 25 or more and 70 or less, where the total thickness of the sealing film is 100.
- the thickness of the second adhesive layer is 5 or more and 50 or less, assuming that the total thickness of the sealing film is 100.
- the melting point of the resin constituting the base material layer is 150 ° C. or higher and 170 ° C. or lower, and the melting point of the resin constituting the second adhesive layer is 110 ° C. or higher and 150 ° C. or lower, [1] to The sealing film according to any one of [3].
- 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.
- a sealing film, an electrode lead wire member, and a battery having high adhesive strength to the first substrate and the second substrate and having resistance to an electrolytic solution it is possible to provide a sealing film, an electrode lead wire member, and a battery having high adhesive strength to the first substrate and the second substrate and having resistance to an electrolytic solution.
- 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.
- 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 made of 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, copolymerizing an acid functional group-containing monomer with olefins, or the like.
- 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.
- 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 melting point of the resin constituting the first adhesive layer 2 is preferably 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 is 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 is 25% or more and 70% or less of the total thickness of the sealing film 1.
- 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 25 or more, 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 70 or less, sufficient thickness can be imparted to the second adhesive layer 3 and the base material layer 4. Therefore, it is possible to increase the adhesive strength between the second adhesive layer 3 and the container without lowering the electrolytic solution resistance of the sealing film 1.
- the "electrolyte solution resistance" is resistance to the electrolytic solution.
- the second adhesive layer 3 is a layer that is fused (adhered) to the container by heating or pressurizing, for example.
- 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 made of 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.
- the 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 a polymer obtained by acid-modifying a random copolymer of propylene and ethylene is preferable because of its excellent flexibility. By using the acid-modified polyolefin, the adhesiveness of the second adhesive layer 3 to the container can be enhanced.
- 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, deterioration of the first adhesive layer 2 can be suppressed.
- the melting point of the resin constituting the second adhesive layer 3 is preferably 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 is 5 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 is 5% or more and 50% or less of the total thickness of the sealing film 1.
- the thickness ratio of the second adhesive layer 3 is 5 or more, the adhesive strength between the second adhesive layer 3 and the storage container can be sufficiently secured.
- the thickness ratio of the second adhesive layer 3 is 50 or less, sufficient thickness can be imparted to the first adhesive layer 2 and the base material layer 4. Therefore, it is possible to increase the adhesive strength between the first adhesive layer 2 and the electrode lead wire 11 without lowering the electrolytic solution resistance of the sealing film 1.
- the base material layer 4 is provided between the first adhesive layer 2 and the second adhesive layer 3.
- the base material layer 4 is made of resin.
- the base material layer 4 mainly contains, for example, polyolefin.
- the phrase "mainly containing polyolefin" in the base material layer 4 means that the content of polyolefin is the highest among the resins constituting the base material layer 4.
- the base material layer 4 preferably contains 50% by mass or more of polyolefin with respect to the total amount of the base material layer 4 (preferably, contains more than 50% by mass of polyolefin with respect to the total amount of the base material layer 4).
- the base material layer 4 preferably contains 80% by mass or more of polyolefin with respect to the total amount of the base material layer 4.
- the base material layer 4 may contain 100% by mass of the acid-modified polyolefin with respect to the total amount of the base material layer 4.
- “the base material layer 4 mainly contains acid-modified polyolefin” means that the base material layer 4 contains 80% by mass or more and 100% by mass of the acid-modified polyolefin with respect to the total amount of the base material layer 4.
- Examples of the polyolefin constituting the base material layer 4 include polypropylene (PP), polyethylene, poly-1-butene, polyisobutylene and the like. Among them, PP is preferable because it has excellent flexibility.
- the polyolefin constituting the base material layer 4 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.
- the ICP (impact copolymer) is preferable as the polyolefin constituting the base material layer 4.
- 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).
- EPR ethylene propylene rubber
- 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 called a heterophasic copolymer, or block copolymer.
- the constituent material of the base material layer is not particularly limited, and a resin other than polyolefin (for example, a fluororesin such as polychlorotrifluoroethylene) may be used.
- a resin other than polyolefin for example, a fluororesin such as polychlorotrifluoroethylene
- the thickness (thickness ratio) of the base material layer 4 is 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 is 25 or more and 70 or less of the total thickness of the sealing film 1.
- the electrolytic solution resistance of the sealing film 1 can be sufficiently ensured. Further, when the thickness ratio of the base material layer 4 is 25 or more, the resin does not flow too much, and it becomes easy to develop the fluidity required for crimping.
- the thickness ratio of the base material layer 4 is 70 or less, sufficient thickness can be imparted to the first adhesive layer 2 and the second adhesive layer 3. 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. Further, when the thickness ratio of the base material layer 4 is 70 or less, the fluidity of the resin does not decrease, and the fluidity of the resin at the time of thermocompression bonding can be suppressed to an appropriate range.
- the melting point of the resin constituting the base material layer 4 is preferably 150 ° C. or higher and 170 ° C. or lower.
- the melting point of the resin constituting the base material layer 4 is 150 ° C. or higher, it is easy to secure the electrolytic solution resistance of the sealing film 1. Further, 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 container and the sealing film 1.
- the melting point M4 of the resin constituting the base material layer 4 is 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 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.
- the melting point M4 When the melting point M4 is higher than the melting point M2, it becomes easy to secure the electrolytic solution resistance of the sealing film 1 without lowering the adhesive strength between the first adhesive layer 2 and the electrode lead wire 11. When the melting point M4 is higher than the melting point M3, it becomes easy to secure the electrolytic solution resistance of the sealing film 1 without lowering the adhesive strength between the second adhesive layer 3 and the container. When the melting point M4 is higher than either one or both of the melting point M2 and the melting point M3, there is also an advantage that heat resistance can be easily imparted to the sealing film 1.
- 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 thickness ratio of the first adhesive layer 2, the base material layer 4 and the second adhesive layer 3 of the sealing film 1 is within the above range, the adhesive strength to the electrode lead wire 11 and the storage container is good, and the sealing film 1 has good adhesive strength. Has resistance to electrolytes. Since the sealing film 1 has good adhesive strength to the electrode lead wire 11 and the container, it is possible to prevent water from entering the container from the outside. Since the sealing film 1 has resistance to an electrolytic solution, it is possible to realize a highly reliable battery 100 that does not easily deteriorate.
- 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
- the first film base material 201, the second film base material 202, the metal foil 203, and the sealant layer 204 are 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 100 ⁇ m).
- first adhesive layer Maleic anhydride-modified polypropylene (melting point 140 ° C)
- Base material layer Polypropylene ICP (melting point 161 ° C)
- Second adhesive layer Random copolymer of propylene and ethylene (melting point 140 ° 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 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 grasped by the gripping part of the testing machine, and the sealing film was peeled from the electrode lead wire so as to be peeled 180 degrees.
- the peeling speed was 50 mm / min.
- the resistance of the sealing film to the electrolytic solution was evaluated as follows.
- the adhesive strength of the sealing film to the container was measured as follows.
- the electrode lead wire whose sealing film was heat-sealed and the battery exterior laminate were superposed and adhered by heat-sealing to obtain a sample for measurement.
- the conditions for heat sealing were 200 ° C., 0.3 MPa, and 3.5 seconds.
- the end of the battery outer layer laminate and the end of the electrode lead wire are grasped by the gripping portion of the testing machine, and the battery outer layer laminate is peeled from the electrode lead wire so as to be peeled 180 degrees. rice field.
- the peeling speed was 50 mm / min.
- Comparative Example 1 As shown in Table 1, in Comparative Example 1, it is considered that the adhesive strength to the storage container was low because the second adhesive layer was thin. In Comparative Examples 2, 4 and 5, it is considered that the adhesive strength to the electrode lead wire was low because the first adhesive layer was thin. In Comparative Examples 3 and 6, it is considered that the electrolytic solution resistance was lowered because the base material layer was thin.
- 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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Abstract
Description
本願は、2020年5月25日に、日本に出願された特願2020-90651号に基づき優先権を主張し、その内容をここに援用する。
封止用のフィルムは、電極リード線と収容容器とを接着し、収容容器と電極リード線との間に隙間ができるのを抑える。これにより、外部から前記隙間を通して収容容器内部へ水が浸入しにくくなる。
(i)電極リード線(第1基体)に対する接着強度。
(ii)収容容器(第2基体)に対する接着強度。
(iii)電解液に対する耐性。
図1は、実施形態の封止フィルム1を示す概略断面図である。図2は、実施形態の電極リード線部材10を示す概略斜視図である。
図1に示すように、封止フィルム1は、第1接着層2と、第2接着層3と、基材層4とを備える。
第1接着層2は、加熱又は加圧によって電極リード線11(図2参照)に融着(接着)する層である。第1接着層2の表面は、封止フィルム1の一方の表面1aである。第1接着層2は、樹脂で構成される。
本発明の一実施形態において、第1接着層2が「酸変性ポリオレフィンを主として含む」とは、第1接着層2は、第1接着層2の全量に対して酸変性ポリオレフィンを80質量%以上100質量%以下含む態様がある。
酸変性PPの酸基は、無水マレイン酸基が好ましい。すなわち、酸変性PPとしては、無水マレイン酸変性PPが好ましい。
第1接着層2を構成する樹脂の融点が110℃以上であると、熱圧着時に第1接着層2が過度に薄くなりにくく、接着強度を確保しやすい。第1接着層2を構成する樹脂の融点が150℃以下であると、熱圧着時に樹脂が流動しやすくなるため、電極リード線11の周囲に樹脂が十分に回り込み、電極リード線11の全周を封止しやすい。
第2接着層3は、例えば、加熱又は加圧によって収容容器と融着(接着)する層である。収容容器については後述する。第2接着層3の表面は、封止フィルム1の他方の表面1bである。第2接着層3は、樹脂で構成される。
本発明の一実施形態において、第2接着層3が「酸変性ポリオレフィンを主として含む」とは、第2接着層3は、第2接着層3の全量に対して酸変性ポリオレフィンを80質量%以上100質量%以下含む態様がある。
第2接着層3を構成する樹脂の融点が110℃以上であると、熱圧着時に第2接着層3が過度に薄くなりにくく、接着強度を確保しやすい。第2接着層3を構成する樹脂の融点が150℃以下であると、熱圧着時に樹脂が流動しやすくなるため、収容容器と電極リード線11との間を封止しやすい。
基材層4は、第1接着層2と第2接着層3との間に介在して設けられている。基材層4は、樹脂で構成される。
本発明の一実施形態において、基材層4が「酸変性ポリオレフィンを主として含む」とは、基材層4は、基材層4の全量に対して酸変性ポリオレフィンを80質量%以上100質量%以下含む態様がある。
基材層4を構成する樹脂の融点が150℃以上であると、封止フィルム1の電解液耐性を確保しやすい。また、封止フィルム1に耐熱性を付与することができる。
基材層4を構成する樹脂の融点が170℃以下であると、封止フィルム1に柔軟性を与えることができる。そのため、電極リード線11および収容容器と、封止フィルム1との間に隙間が生じにくくなる。
融点M4が融点M2または融点M3のいずれか一方又は両方より高いと、封止フィルム1に耐熱性を付与しやすいという利点もある。
図2に示すように、電極リード線部材10は、電極リード線11と、一対の封止フィルム1とを有する。
一対の封止フィルム1は、第1接着層2が向かい合って配置される。一対の封止フィルム1は、電極リード線11を挟持する。一対の封止フィルム1は、それぞれ電極リード線11の一方の面および他方の面に相当する領域に接する。そのため、一対の封止フィルム1は、全体として電極リード線11の全周に接している。
リード線本体111の材料としては、例えば、アルミニウム、銅、ニッケル、鉄、金、白金、各種合金など、公知の金属を用いることができる。なかでも、導電性に優れ、コスト的にも有利なことから、アルミニウム又は銅が好ましい。
リード線本体111は、アルミニウム板またはニッケルめっき銅板が好ましい。
図3は、実施形態の電池100を示す概略斜視図である。
図3に示すように、電池100は、上述した電極リード線部材10と、収容容器20と、リチウムイオン電池30(電池本体)とを有する。
容器本体21は、リチウムイオン電池30を収容する凹部を形成する成形部21aを有する。容器本体21は、電池外装用積層体を絞り成形して得られる。蓋22は、電池外装用積層体で構成され、容器本体21と同等の平面視面積を有する。電池外装用積層体については後述する。
収容容器20は、容器本体21と蓋22とを重ね合わせ、周縁部25をヒートシールして形成される。
図4に示すように、容器本体21と蓋22との構成材料である電池外装用積層体は、第1フィルム基材201、第2フィルム基材202、金属箔203、シーラント層204がこの順で積層された積層体である。
金属箔203としては、アルミニウム箔、ステンレス箔、銅箔、鉄箔などが好ましい。
第1接着層、基材層、および第2接着層がこの順に積層された封止フィルムを、次のようにして作製した。各層の原料となる樹脂をそれぞれ別々に加熱溶融し、同時多層押出成形が可能な押出機を用いて同時多層製膜を行うことで積層体を得た。この積層体を所定の大きさに切断することで、各実施例、比較例の封止フィルムを得た。封止フィルムは、帯状(幅15mm、厚さ100μm)に形成した。
第1接着層:無水マレイン酸変性ポリプロピレン(融点140℃)
基材層:ポリプロピレンICP(融点161℃)
第2接着層:プロピレンとエチレンとのランダム共重合体(融点140℃)
ポリプロピレンICPは、第1相のなかに第2相が分散する構造(海島構造)を有する。第1相は、ホモPPで構成される。第2相は、エチレンプロピレンラバーとポリエチレンとを含む。ポリプロピレンICPは、PPとエチレンプロピレンラバーとポリエチレンとを含む混合物である。
リード線本体と、リード線本体の表面に形成された表面処理層とを有する電極リード線を作製した。リード線本体としては、幅45mm×長さ52mmの矩形状のニッケルめっき銅箔を用いた。
厚さ12μmのPETフィルム、厚さ15μmのナイロンフィルム、厚さ40μmのアルミニウム箔、厚さ80μmのPPフィルムをドライラミネートで積層し、電池外装用積層体を得た。
電極リード線に対する封止フィルムの接着強度を次のようにして測定した。
封止フィルムと電極リード線とを重ね合わせ、ヒートシールにより接着して得られた積層体を帯状(幅10mm×長さ120mm)に切断して測定用検体を得た。ヒートシールの条件は、180℃、0.5MPa、10秒間とした。
電解液に対する封止フィルムの耐性を次のようにして評価した。
電池外装用積層体を用いて包装袋を作製し、その中に、LiPF6を1.0mol/リットル含む電解液(DMC:EMC:EC=4:3:3)を入れた。電解液には、純水を0.2質量%(2000ppm)添加した。
収容容器に対する封止フィルムの接着強度を次のようにして測定した。
封止フィルムがヒートシールされた電極リード線と、電池外装用積層体とを重ね合わせ、ヒートシールにより接着し、測定用検体を得た。ヒートシールの条件は、200℃、0.3MPa、3.5秒間とした。
Claims (7)
- 金属製の第1基体と、第2基体との間を封止する封止フィルムであって、
酸変性ポリオレフィンを主として含み、前記第1基体に接着する第1接着層と、
ポリオレフィンを主として含み、前記第2基体に接着する第2接着層と、
前記第1接着層と前記第2接着層との間に設けられた基材層と、を備え、
前記第1接着層の厚さは、前記封止フィルムの全体の厚さを100として、25以上70以下であり、
前記基材層の厚さは、前記封止フィルムの全体の厚さを100として、25以上70以下であり、
前記第2接着層の厚さは、前記封止フィルムの全体の厚さを100として、5以上50以下である、封止フィルム。 - 前記基材層を構成する樹脂の融点は、前記第1接着層または第2接着層を構成する樹脂の融点より高い、請求項1記載の封止フィルム。
- 前記第2接着層を構成する前記ポリオレフィンは、酸変性ポリオレフィンである、請求項1または2に記載の封止フィルム。
- 前記基材層を構成する樹脂の融点は、150℃以上170℃以下であり、
前記第2接着層を構成する樹脂の融点は、110℃以上150℃以下である、請求項1~3のうちいずれか1項に記載の封止フィルム。 - 前記第1接着層を構成する樹脂の融点は、110℃以上150℃以下である、請求項1~4のうちいずれか1項に記載の封止フィルム。
- 請求項1~5のうちいずれか1項に記載の封止フィルムと、
一方向に延在する電極リード線である第1基体と、を備える電極リード線部材。 - 請求項6に記載の電極リード線部材と、
前記電極リード線部材が接続される電池本体と、
前記電池本体を収容する収容容器である第2基体と、を備える電池。
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JP2022526573A JPWO2021241560A1 (ja) | 2020-05-25 | 2021-05-25 | |
CN202180037094.8A CN115668602A (zh) | 2020-05-25 | 2021-05-25 | 封装膜、电极引线部件及电池 |
KR1020227040453A KR20230005889A (ko) | 2020-05-25 | 2021-05-25 | 봉지 필름, 전극 리드선 부재, 및 전지 |
US17/926,982 US20230207936A1 (en) | 2020-05-25 | 2021-05-25 | Sealing Film, Electrode Lead Member, And Battery |
EP21812564.9A EP4160635A1 (en) | 2020-05-25 | 2021-05-25 | Sealing film, electrode lead member, and battery |
CA3179464A CA3179464A1 (en) | 2020-05-25 | 2021-05-25 | Sealing film, electrode lead member, and battery |
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JP2014225378A (ja) * | 2013-05-16 | 2014-12-04 | 株式会社日立製作所 | タブリード用シール材、タブリードおよびリチウムイオン二次電池 |
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JP2017073200A (ja) | 2015-10-05 | 2017-04-13 | 住友電気工業株式会社 | リード部材 |
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JP2020090651A (ja) | 2018-11-27 | 2020-06-11 | 太陽ホールディングス株式会社 | ポリフェニレンエーテル、硬化性組成物、ドライフィルム、硬化物、および電子部品 |
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2021
- 2021-05-25 JP JP2022526573A patent/JPWO2021241560A1/ja active Pending
- 2021-05-25 US US17/926,982 patent/US20230207936A1/en active Pending
- 2021-05-25 KR KR1020227040453A patent/KR20230005889A/ko unknown
- 2021-05-25 CN CN202180037094.8A patent/CN115668602A/zh active Pending
- 2021-05-25 CA CA3179464A patent/CA3179464A1/en active Pending
- 2021-05-25 EP EP21812564.9A patent/EP4160635A1/en active Pending
- 2021-05-25 WO PCT/JP2021/019758 patent/WO2021241560A1/ja unknown
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JP2014225378A (ja) * | 2013-05-16 | 2014-12-04 | 株式会社日立製作所 | タブリード用シール材、タブリードおよびリチウムイオン二次電池 |
JP2016091939A (ja) * | 2014-11-10 | 2016-05-23 | 凸版印刷株式会社 | 端子用樹脂フィルム、それを用いたタブ及び蓄電デバイス |
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JP2017073200A (ja) | 2015-10-05 | 2017-04-13 | 住友電気工業株式会社 | リード部材 |
JP2019220295A (ja) * | 2018-06-18 | 2019-12-26 | 大倉工業株式会社 | タブリード用フィルム、及びこれを用いたタブリード |
JP2020090651A (ja) | 2018-11-27 | 2020-06-11 | 太陽ホールディングス株式会社 | ポリフェニレンエーテル、硬化性組成物、ドライフィルム、硬化物、および電子部品 |
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JPWO2021241560A1 (ja) | 2021-12-02 |
EP4160635A1 (en) | 2023-04-05 |
KR20230005889A (ko) | 2023-01-10 |
CN115668602A (zh) | 2023-01-31 |
CA3179464A1 (en) | 2021-12-02 |
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