JP2003092091A - Film for lead wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film for lead wire for a battery, and a packaging material for a battery using the same, which can tightly seal stably without causing short circuit between a barrier layer of an outer package body and the lead wire due to heat and pressure of heat seal, in inserting a battery main body into the outer package body with polyolefin resin as a sealant layer and sealing it by heat sealing its periphery edge. SOLUTION: In tightly sealing a periphery edge part of the outer package body by pinching a lead wire main body made of strip- or bar metal at a periphery seal part of the over package body containing a battery made of a laminated body having heat seal property inside, a film to be interposed between the laminated body and the lead wire main body is to be a multi-layer structure film including a heat resistant resin layer consisting of 4-methyl-1-pentene polymer graft denatured at least with unsaturated carboxylic acid.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a battery lead wire film and a battery packaging material using the same, which is a battery having a liquid or solid organic electrolyte (polymer polymer electrolyte) having moisture resistance and content resistance. Or a packaging material used for a fuel cell, a capacitor, a capacitor, etc., and a lead wire film interposed between an outer package for packaging the battery body, a lead wire portion of the battery and the outer package, and a lead wire using the same. , A battery packaging material, and a battery having the packaging material as an exterior body.

[0002]

2. Description of the Related Art The battery in the present invention means a material including an element for converting chemical energy into electric energy, such as a lithium ion battery, a lithium polymer battery, a fuel cell, etc., or a liquid, a solid ceramic, an organic material. Electrolytic capacitors such as liquid capacitors, solid capacitors, double-layer capacitors, etc. containing dielectrics such as The batteries can be used as personal computers, mobile terminal devices (mobile phones, PDAs).
Etc.), video cameras, electric vehicles, energy storage batteries, robots, satellites, etc. As the outer casing of the battery, a metal can obtained by pressing a metal into a cylindrical or rectangular parallelepiped container, or a laminate made of a composite film obtained by laminating a plastic film, a metal foil or the like into a bag shape. What was done (the following, an exterior body) was used. The battery exterior body has the following problems. In a metal can, the shape of the battery itself is determined because the outer wall of the container is rigid. Therefore, since the hardware side is designed to match the battery, the size of the hardware using the battery is determined by the battery, and the degree of freedom in shape is reduced. Therefore, there is a tendency to use the bag-shaped exterior body. The material composition of the outer package is composed of at least a base material layer, a barrier layer, an adhesive layer for adhering each layer to the sealant layer, and an intermediate layer if necessary, in view of the required physical properties, processability, economy, etc. of the battery. May be provided. A pouch is formed from the laminated body having the above-mentioned structure of the battery, or at least one surface is press-molded to form a battery housing portion for housing the battery body, and is a pouch type or an embossed type (covering the lid body). In the above, a battery is obtained by sealing necessary portions of each peripheral edge by heat sealing. The sealant layer is required to have heat sealability between the sealant layers as well as heat sealability for lead wires (metal). By using an acid-modified polyolefin resin having metal adhesiveness as the sealant layer Adhesion with the line part is secured.

However, when an acid-modified polyolefin resin is laminated as a sealant layer for an exterior body, it is inferior in processability to a general polyolefin resin, and the cost is high. A method has been adopted in which a general polyolefin resin layer is used as the layer, and a lead wire film that can be heat-bonded to both the sealant layer and the lead wire is interposed in the lead wire portion. Specifically, as shown in FIG. 8A, both the lead wire 4 ′ and the sealant layer 14 ′ of the laminated body 10 are provided between the lead wire 4 ′ and the sealant layer 14 ′ of the laminated body 10 ′. On the other hand, by interposing the lead wire film 20 ′ having heat sealability, the hermeticity at the lead wire portion was secured. As the lead wire film 20 ′, a film made of the unsaturated carboxylic graft polyolefin, metal crosslinked polyethylene, a copolymer of ethylene or propylene and acrylic acid or methacrylic acid was used.

[0004]

However, in the case where the sealant layer of the laminate constituting the battery outer package (hereinafter referred to as the outer package) is made of a polyolefin resin, the battery main body is housed in the outer package and the periphery thereof is sealed. Then, for example, a lead wire film 2 composed of an acid-modified polyolefin single layer 2
When using 0 ', in the part where the lead wire exists,
As shown in FIG. 8B, the sealant layer 14 ′ of the laminate and the lead wire film layer 20 ′ are both melted by heat and pressure for heat sealing, and the pressure of the pressurizing portion is increased by pressing. May be extruded out of area. As a result, the aluminum foil which is the barrier layer 12 ′ of the laminate 10 ′ and the lead wire 4 ′ made of a metal may come into contact (S) with each other to cause a short circuit. The object of the present invention is to insert a battery body into an outer package having a polyolefin resin as a sealant layer and heat-seal the periphery of the outer package in a battery packaging to seal the barrier of the outer package by heat and pressure of the heat seal. An object of the present invention is to provide a film for a battery lead wire that can be stably sealed without short-circuiting between the layer and the lead wire, and a battery packaging material using the film.

[0005]

The above-mentioned problems can be solved by the present invention described below. That is, claim 1
The invention described in, the peripheral edge sealing portion of the outer body housing the battery body in the outer body made of a laminate having a heat-sealing property on the inner surface, sandwiching the lead wire body made of a slender plate or rod-shaped metal, A film to be interposed between the laminate and the lead wire main body when hermetically sealing the peripheral portion of the outer package, which is a 4-methyl-1-pentene-based film graft-modified with at least an unsaturated carboxylic acid. A lead wire film, which is a multi-layered film including a heat-resistant resin layer made of a polymer. The invention described in claim 2 is characterized in that the heat-resistant resin layer according to claim 1 is composed of a 4-methyl-1-pentene homopolymer graft-modified with an unsaturated carboxylic acid. The invention described in claim 3 is the 4-methyl-1 in which the heat-resistant resin layer according to claim 1 is graft-modified with an unsaturated carboxylic acid.
-(1) 4-methyl-1-pentene homopolymer and α-olefin (2-methyl-1-pentene) having 2 to 20 carbon atoms such as ethylene, propylene, butene, and hexene (2) α ・
It is selected from olefin polymers, ethylene-α-olefin copolymers, propylene-α-olefin copolymers, unsaturated carboxylic acid graft-modified α-olefin polymers and α-olefin copolymers, and butadiene rubber. At least one of the blending resins (1) or (2) is a blended resin. In the invention described in claim 4, the heat-resistant resin layer according to claim 1 is a 4-methyl-1-pentene homopolymer and an α-olefin having 2 to 20 carbon atoms such as ethylene, propylene, butene, and hexene ( 4-methyl-1
-Excluding pentene) is a resin graft-modified with an unsaturated carboxylic acid. In the invention described in claim 5, the heat-resistant resin layer according to claim 1 is a 4-methyl-1-pentene homopolymer and an α-olefin having 2 to 20 carbon atoms such as ethylene, propylene, butene, and hexene ( (1) 4-methyl-1-pentene homopolymer, 4-methyl-1-pentene homopolymer, 4-methyl-1-pentene homopolymer, Homopolymers and copolymers of ethylene, propylene, butene, hexene and other α-olefins having 2 to 20 carbon atoms (excluding 4-methyl-1-pentene), (2) α-olefin polymers, ethylene- α-olefin copolymer, propylene-α-olefin copolymer, unsaturated carboxylic acid graft-modified α-olefin polymer and α-olefin copolymer, butadiene rubber At least one according to the blending resin is selected (1) or (2) is characterized in that a resin blended. In the invention described in claim 6, one surface of the heat-resistant resin layer according to any one of claims 1 to 5 is a layer having heat sealability with the inner surface of the laminate, and the other surface is made of metal. On the other hand, it is a layer having a heat-sealing property. In the invention described in claim 7, the layer having heat sealability with the inner surface of the laminate according to claim 6,
(1) α-olefin polymer, (2) ethylene-α-olefin copolymer, (3) propylene-α-olefin copolymer, (4) unsaturated carboxylic acid graft-modified α- Olefin polymer and α-olefin copolymer, (5) copolymer of ethylene and acrylic acid or acrylic acid derivative, (6) copolymer of ethylene and methacrylic acid or methacrylic acid derivative, (7) metal It is characterized by comprising a resin selected from ion-crosslinked α-olefin polymers or copolymers of ethylene and α-olefins. In the invention described in claim 8, the layer having a heat-sealing property with respect to the metal according to claim 6 is (1) an unsaturated carboxylic acid graft-modified α-olefin polymer and α-olefin copolymer. (2) Copolymer of ethylene and acrylic acid or acrylic acid derivative, (3) Copolymer of ethylene and methacrylic acid or methacrylic acid derivative, (4) Metal ion cross-linked α-olefin polymer or ethylene α ・
It is characterized by comprising a resin selected from copolymers with olefins. According to the invention described in claim 9, the battery main body is inserted into an exterior body formed by using a laminate including at least a base material layer, an adhesive layer, aluminum, a chemical conversion treatment layer, and a sealant layer of a polyolefin-based resin, and the exterior body is formed. When heat-sealing the peripheral edge of the body, the lead wire film according to any one of claims 1 to 8 is interposed between the outer package and the lead wire. . The invention described in claim 10 is
A battery body comprising a cell and a lead wire is sealed and sealed in an outer casing made of the battery packaging material according to claim 9.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention includes a lead wire made of an elongated plate or a rod-shaped metal in a peripheral seal portion of an outer casing made of a laminate having a heat-sealing property on an inner surface, which includes a barrier layer made of a metal foil. When the main body is sandwiched and the peripheral portion of the outer package is hermetically sealed, a lead wire film interposed between the laminate and the lead wire main body is graft-modified with at least an unsaturated carboxylic acid. A multi-layered film including a heat-resistant resin layer made of a methyl-1-pentene-based polymer, the battery body is housed in an outer casing made of a battery packaging material, and the periphery of the outer casing is sealed by heat sealing. At that time, it is possible to form a stable battery package without causing a short circuit between the lead layer and the barrier layer of the battery packaging material. Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a view for explaining the lead wire film of the present invention. (A) a sectional view showing the layer structure of the lead wire film, (b) a battery lead wire, an outer casing, and a lead wire film. The figure explaining material and positional relationship (one side), (c)
It is a schematic cross section of the lead wire part after heat sealing. Figure 2
[Fig. 3] is a cross-sectional view showing a layer configuration example of a laminated body forming an outer casing of a battery. FIG. 3 is a perspective view illustrating a method of mounting the lead wire film in bonding the battery packaging material and the lead wire. FIG. 4 is a diagram illustrating a method of interposing the lead wire film between the lead wire and the outer casing in the present invention. FIG. 5 is a perspective view illustrating a battery pouch-type exterior body. FIG. 6 is a perspective view illustrating an embossed type outer casing of a battery. FIG. 7 is a perspective view for explaining the molding in the embossing type, (b) an embossed exterior body, (c) X ₂ -X ₂ section sectional view,
(D) It is an enlarged view of Y ₁ section.

The lead wire of the battery is made of an elongated plate-shaped or rod-shaped metal, and the plate-shaped lead wire has a thickness of 50 to 2000 μm and a width of about 2.5 to 20 mm. Examples thereof include AL, Cu (including Ni plating), Ni, and the like.

Further, the sealant layer of the outer casing of the battery is formed of a resin capable of heat-sealing the sealant layers (in the case of multiple layers, the innermost resin layers thereof). It is desirable that the sealant layer (innermost resin layer in the case of multiple layers) of the outer package is a resin that can be directly heat-sealed to the lead wire. However, as mentioned above, a standard polyolefin such as polyethylene or polypropylene alone,
Alternatively, a resin material having a single layer or a multilayer structure of a blend is used as a sealant layer, and a lead wire film having thermal adhesiveness to both the sealant layer and the lead wire is provided between the lead wire and the sealant layer. A method of heat-sealing each other by interposing them is adopted.

The outer casing of the battery is required to have a property of maintaining the performance of the battery main body for a long period of time, and a base material layer, a barrier layer, a sealant layer and the like are laminated by various laminating methods. In particular, when the sealant layer of the laminated body that constitutes the battery exterior body (hereinafter referred to as the exterior body) is made of polyolefin resin or the like, when the battery body is housed in the exterior body and the periphery is sealed and sealed, the lead wire 8 (a) and 8 (a) and FIG.
As shown in (b), the sealant layer of the outer package and the lead wire film layer are both melted by heat and pressure for heat sealing, and the barrier of the outer package is an insulating layer due to pressure. Both the layer inside the layer 12 ′ and the lead wire film layer 20 ′ may be extruded out of the area of the pressing portion. As a result, the aluminum foil which is the barrier layer 12 ′ of the outer package and the lead wire body 4 ′ made of metal may come into contact with each other to cause a short circuit S.

As a result of earnest studies on the method of preventing the occurrence of the short circuit, the present inventors have found that the outer peripheral body of the exterior body, in which the battery main body is housed in the exterior body made of a laminate having heat sealability on the inner surface, is A lead wire film interposed between the laminated body and the lead wire body at the time of hermetically sealing the peripheral portion of the outer package by sandwiching the lead wire body made of an elongated plate or a rod-shaped metal, By providing a multilayer constitution film containing a heat-resistant resin layer made of a 4-methyl-1-pentene-based polymer graft-modified with an unsaturated carboxylic acid, the heat fusion layer can be formed by heat and pressure during heat sealing. Even when fluidized, the heat-resistant resin layer hardly fluidizes and remains as an insulating film even during heat sealing, which causes contact between the barrier layer of the laminate of the outer package and the lead wire. And we have completed the present invention found that it is possible to prevent Yoto.

The heat-resistant resin layer composed of the 4-methyl-1-pentene-based polymer graft-modified with the unsaturated carboxylic acid may be a single component, as described below, or other polymer or copolymer. You may blend a polymer. For example, the heat-resistant resin layer may be a layer composed only of 4-methyl-1-pentene homopolymer (A resin) which is graft-modified with an unsaturated carboxylic acid. In addition, the A resin contains (1) 4-methyl-1-pentene homopolymer and 2 carbon atoms such as ethylene, propylene, butene, and hexene.
To 20 α-olefins (excluding 4-methyl-1-pentene), (2) α-olefin polymers, ethylene-α-olefin copolymers, propylene and α
A copolymer with an olefin, an α-olefin polymer modified with an unsaturated carboxylic acid graft and an α-olefin copolymer, or a blending resin selected from (1) or (2) of a butadiene rubber. It may be a resin in which at least one is blended. By blending the above resin and the like with the A resin to form the heat resistant resin layer, there is an effect that the adhesion between the layers in the coextrusion of the heat resistant resin layer and the sealant side resin layer is improved.

The heat-resistant resin layer of the lead wire film of the present invention comprises a 4-methyl-1-pentene homopolymer and an α-olefin (having 2 to 20 carbon atoms) such as ethylene, propylene, butene and hexene. It is also possible to use a resin (B resin) obtained by graft-modifying a copolymerized product of (with the exception of 4-methyl-1-pentene) with an unsaturated carboxylic acid. Further, in the B resin, (1) 4-methyl-1-pentene homopolymer, 4-methyl-1-pentene homopolymer and ethylene, propylene, butene, hexene or other α-olefin having 2 to 20 carbon atoms. A copolymer with (excluding 4-methyl-1-pentene), (2) α-olefin polymer,
Ethylene-α ・ olefin copolymer, propylene and α ・
At least the blending resin (1) or (2) selected from a copolymer with an olefin, an unsaturated carboxylic acid graft-modified α-olefin polymer and an α-olefin copolymer, and butadiene rubber. You may blend one.

The α-olefin polymer as the blending resin is polyethylene, polypropylene, polybutene or the like, and the copolymer of ethylene and α-olefin is the copolymer of ethylene and propylene or ethylene and hexene. And a copolymer of ethylene and butene. Further, the copolymer of propylene and α-olefin is a copolymer of polypropylene and butene or a copolymer of polypropylene, ethylene and butene. In addition, unsaturated carboxylic acid graft modified α
-Olefin polymers and α-olefin copolymers mean α-olefin polymers graft-modified with unsaturated carboxylic acids such as polyethylene graft-modified with unsaturated carboxylic acids and propylene graft-modified with unsaturated carboxylic acids. Copolymer of ethylene and propylene graft-modified with unsaturated carboxylic acid, copolymer of ethylene and α-olefin graft-modified with unsaturated carboxylic acid, or propylene graft-modified with unsaturated carboxylic acid It is a copolymer of propylene and α-olefin graft-modified with an unsaturated carboxylic acid such as a copolymer of ethylene and ethylene or a copolymer of propylene with ethylene-butene graft-modified with an unsaturated carboxylic acid.

In the lead wire film of the present invention, at least one surface of the heat resistant resin layer is a layer having heat sealability with the sealant surface of the laminate (sealant side resin layer),
The other surface is a multilayer film formed as a layer (resin layer on the lead wire side) having a heat-sealing property with respect to the lead wire (metal), and a coextrusion film forming method is desirable as the laminating method. The sealant-side resin layer includes (1) an α-olefin polymer, (2) a copolymer of ethylene and α-olefin, (3) a copolymer of propylene and α-olefin, and (4) unsaturated carvone. Acid graft modified α-olefin polymer and α-olefin copolymer,
(5) Copolymer of ethylene and acrylic acid or acrylic acid derivative, (6) Copolymer of ethylene and methacrylic acid or methacrylic acid derivative, (7) Metal ion cross-linked α-olefin polymer or ethylene It is formed from a resin selected from copolymers with α-olefins.

Further, the lead wire side resin layer comprises (1) an unsaturated carboxylic acid graft modified α-olefin polymer and an α-olefin copolymer (2) a copolymer of ethylene and acrylic acid or an acrylic acid derivative. It is selected from a combination, (3) a copolymer of ethylene and methacrylic acid or a methacrylic acid derivative, and (4) a metal ion-crosslinked α-olefin polymer or a copolymer of ethylene and α-olefin.

In the lead wire film of the present invention, the sealant-side resin layer and the lead wire-side resin layer are arranged at least on both sides of the heat-resistant resin layer, but the adhesive strength between the layers is stabilized. Therefore, the heat resistant resin layer may be multilayered or an adhesive resin layer may be added. Hereinafter, an example of the structure of the lead wire film of the present invention will be described by taking the case where the sealant side resin layer is a polyethylene resin as an example. Hereinafter, as illustrated by the abbreviations, the left side is the sealant layer side resin layer, the right side is the lead wire side resin layer, and the resins and blend contents constituting the layers indicated by the respective abbreviations are as follows. PE: polyethylene PEa: unsaturated carboxylic acid graft-modified polyethylene TPX: 4-methyl-1-pentene homopolymer TPX copolymer: 4-methyl-1-pentene homopolymer and ethylene, propylene, butene, hexene, etc. Resin having 2 to 20 carbon atoms of .alpha..olefin (excluding 4-methyl-1-pentene), TPX blend: (1) 4-methyl-1-pentene homopolymer and ethylene, Carbon number of propylene, butene, hexene, etc. is 2
20 copolymers with α-olefins (excluding 4-methyl-1-pentene), (2) α-olefin polymers, ethylene-α-olefin copolymers, propylene-α-olefin copolymers, Resin TPX blended with at least one of the blending resins (1) or (2) selected from unsaturated carboxylic acid graft-modified α-olefin polymers and α-olefin copolymers, butadiene rubber Copolymer blend: TPX copolymer with (1) 4-methyl-1-pentene homopolymer (2) α-olefin polymer, ethylene-α-olefin copolymer, propylene and α-olefin copolymer Of a blending resin selected from a combination, an unsaturated carboxylic acid graft-modified α-olefin polymer, an α-olefin copolymer, and butadiene rubber Resin TPXa blended with at least one of (1) or (2): 4-methyl-1-pentene homopolymer modified with unsaturated carboxylic acid TPX copolymer a: 4-methyl-1-pentene A homopolymer and an α-olefin having 2 to 20 carbon atoms (excluding 4-methyl-1-pentene) such as ethylene, propylene, butene, and hexene are copolymerized and graft-modified with an unsaturated carboxylic acid. Resin TPXa blend: TPXa with (1) 4-methyl-1-pentene homopolymer, 4-methyl-1-pentene homopolymer and ethylene, propylene,
Copolymers with butene, hexene and other α-olefins having 2 to 20 carbon atoms (excluding 4-methyl-1-pentene), (2) α-olefin polymers, ethylene-α-olefin copolymers, propylene (1) or (2) of a blending resin selected from a copolymer of styrene and α-olefin, an unsaturated carboxylic acid graft-modified α-olefin polymer and α-olefin copolymer, and butadiene rubber Resin T blended with at least one of the described
PX copolymer a blend: (1) 4-methyl-1-pentene homopolymer, 4-methyl-1-pentene homopolymer and ethylene, propylene in TPX copolymer a
Copolymers with butene, hexene and other α-olefins having 2 to 20 carbon atoms (excluding 4-methyl-1-pentene), (2) α-olefin polymers, ethylene-α-olefin copolymers, propylene (1) or (2) of a blending resin selected from a copolymer of styrene and α-olefin, an unsaturated carboxylic acid graft-modified α-olefin polymer and α-olefin copolymer, and butadiene rubber Resin blended with at least one of the above

As a three-layer structure, PE / TPXa / PEa PEa / TPXa / PEa PE / TPXa blend / PEa PE / TPXa copolymer / PEa PE / TPXa copolymer blend / PEa

The heat-resistant resin layer contains TPX, a TPX copolymer,
It can be multi-layered with a layer such as TPX blend, and also (1) α-olefin polymer, (2) copolymer of ethylene and α-olefin, (3) copolymer of propylene and α-olefin. Coupling, (4) unsaturated carboxylic acid graft-modified α-olefin polymer and α-olefin copolymer, (5) copolymer of ethylene and acrylic acid or acrylic acid derivative, (6) ethylene and methacryl Copolymer with acid or methacrylic acid derivative,
(7) A multi-layer structure including a layer composed of a metal ion-crosslinked α-olefin polymer or a copolymer of ethylene and α-olefin may be used. For example, as a four-layer structure, PE / TPX / TPXa / PEa PE / TPX blend / TPXa / PEa PEa / TPX copolymer / TPXa / PEa PE / TPX copolymer blend / TPXa blend / P
Ea PP / TPX blend / TPXa copolymer blend / P
Ea

The five-layer constitution is as follows: PEa / TPX blend / TPXa blend / TPX blend / PEa PEa / TPXa blend / TPX / TPXa blend / PEa PE / TPXa blend / TPXa copolymer blend /
TPXa blend / PEa and the like.

The battery packaging material to which the lead wire film of the present invention is applied is a laminate comprising at least a base material layer, an adhesive layer, aluminum, a chemical conversion treatment layer, and a polyolefin resin sealant layer. When the battery main body is inserted into an exterior body formed by using a laminate and the periphery of the exterior body is heat-sealed, the lead wire film according to any one of the above is interposed between the exterior body and the lead wire. Is. Then, the battery main body including the cell and the lead wire is sealed and sealed in the exterior body, and is in a state of functioning as a battery.

As described above, 4- or 4-resin graft-modified with unsaturated carboxylic acid such as A resin or B resin is used.
The methyl-1-pentene-based polymer (heat-resistant resin layer) has a melting point above the melting point at room temperature, as compared with ordinary polyolefins used as sealant layers for outer casings and acid-modified polyolefins used as lead wire films. It excels in mechanical strength at high temperature, such as tensile strength, puncture strength, and compression strength, and does not melt and fluidize even when pressure is applied under the heat-sealing condition of the outer package, and the barrier layer and the lead wire. It is possible to prevent a short circuit with. The lead wire film of the present invention has a TPXa-based resin layer as a central layer, a resin layer having heat sealability as a sealant layer of a battery packaging material on at least one surface, and a lead wire having heat sealability on the other surface. The resin layer has a laminated structure of at least three layers, but other resins may be blended as described above in order to stabilize the adhesive strength between the resin layers. Alternatively, the heat resistant resin layer may be multilayered.

When the lead wire film 20 of the present invention is interposed between the outer package and the lead wire for hermetic sealing, the lead wire film is sealed as shown in FIG. 1 (c). Heat resistant resin layer 2 due to heat and pressure
Reference numeral 2 denotes a film-like layer that remains between the barrier layer 12 and the lead wire 4 of the outer package and functions as an insulating layer that prevents a short circuit between the barrier layer 12 and the lead wire 4 to avoid the short circuit. be able to.

The lead wire film 20 of the present invention is preferably formed by coextrusion. For example, in the case of a three-layer structure, for example, in FIG.
The heat-resistant resin layer 22 has a thickness of 5 μm.
As described above, the total thickness of the lead wire film 20 may be ⅓ or more of the lead wire used, for example, 100 μm.
If the lead wire has a thickness of m, the lead wire film 20
The total thickness of is preferably 30 μm or more.

The battery packaging material forms an exterior body for packaging the battery body. Depending on the form of the exterior body, a pouch type as shown in FIG. 5 and a pouch type as shown in FIGS. ) Or an embossed type as shown in FIG. The pouch type has a bag type such as a three-sided seal, a four-sided seal, and a pillow type.
It is illustrated as a pillow type. The embossed type is
As shown in FIG. 6 (a), a recess may be formed on one side, or as shown in FIG. 6 (b), a recess may be formed on both sides to accommodate the battery body and heat seal the four sides of the periphery. You may seal it. Further, there is also a type in which recesses are formed on both sides by sandwiching a folded portion as shown in FIG. 6 (c) to accommodate a battery and heat seal three sides.

The lead wire film 20 is interposed between the outer casing 5 and the lead wire 4, and a specific method thereof is, for example, as shown in FIGS. 3 (a) and 3 (b), the battery main body 2 The lead wire film 20 is placed above and below the lead wire portion hermetically sealed portion (actually fixed by a temporary seal)
It is inserted into the outer package 5 and heat-sealed while sandwiching the lead wire portion to seal the lead wire portion.

As a method of interposing the lead wire film 20 in the lead wire 4, as shown in FIG. 3D or FIG. 3E, the lead wire film 2 is placed at a predetermined position of the lead wire 4.
0 film may be wrapped. As shown in FIG. 4A, the lead wire 4 and the lead wire film 20 may be used by preliminarily welding the lead wire film 20 to the lead wire 4 mk. Alternatively, as shown in FIG. 4B, the lead wire 4 and the lead wire film 20 may be used in a state of being temporarily attached wk. Furthermore, FIG. 4 (c) or FIG.
As shown in (d), the sealant layer 1 of the exterior body 10 is previously formed.
The surface 4 may be temporarily attached by wk or welded by mk.

Next, the battery lead film 2 of the present invention
The material of the battery packaging material (laminate) 10 to which 0 is applied will be described. As shown in FIG. 2A, the laminated body 10 includes at least the base material layer 11, the adhesive layer 16, and the barrier layer 1.
2, chemical conversion treatment layer 15, adhesive resin layer 13, sealant layer 1
It is composed of four. Alternatively, as shown in FIGS. 2B and 2C, at least the base material layer 11, the adhesive layer 16, the chemical conversion treatment layer 15 (1), the barrier layer 12, the chemical conversion treatment layer 15 (2), and the adhesive resin. Layer 13, sealant layer 14
It is composed of

When the base material layer 11 is used as a battery, the base material layer 11 is preferably a resin layer having an insulating property since it is a portion that directly contacts the hardware. Considering the existence of pinholes in the film itself and the occurrence of pinholes during processing, the base material layer needs to have a thickness of 6 μm or more, and the preferable thickness is 12 to 30 μm.

As the base material layer 11 in the outer package,
Made of stretched polyester or nylon film,
At this time, examples of the polyester resin include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, copolymerized polyester, and polycarbonate. Examples of nylons include polyamide resins, that is, nylon 6, nylon 6,6, copolymers of nylon 6 and nylon 6,6, nylon 6,10, polymethaxylylene adipamide (MXD6), and the like.

The base material layer 11 may be laminated in order to improve the pinhole resistance and the insulating property when used as an outer casing of a battery. When the base material layer is laminated, the base material layer includes at least one resin layer of two or more layers, and the thickness of each layer is 6 μm or more, preferably 12 to 30 μm.
Examples of laminating the base material layer include the following 1) to 8). 1) Stretched polyethylene terephthalate / stretched nylon 2) Stretched nylon / stretched stretched polyethylene terephthalate In addition, mechanical suitability of packaging materials (stability of conveyance in packaging machines and processing machines), surface protection (heat resistance, electrolyte resistance) ) Protecting the base material layer for the purpose of reducing the frictional resistance between the die and the base material layer during embossing or when the electrolytic solution adheres when the battery exterior body is embossed as the secondary processing. In order to achieve this, the base material layer may be multi-layered and a fluororesin layer, an acrylic resin layer, a silicone resin layer, a polyester resin layer, or a resin layer composed of a blend thereof may be provided on the surface of the base material layer. preferable. For example, 3) Fluorine-based resin / stretched polyethylene terephthalate (fluorine-based resin is a film-like material or is formed by drying after liquid coating) 4) Silicone-based resin / stretched polyethylene terephthalate (silicone-based resin is a film-like material or liquid) Formed by drying after coating) 5) Fluorine resin / stretched polyethylene terephthalate /
Stretched nylon 6) Silicone resin / stretched polyethylene terephthalate / stretched nylon 7) Acrylic resin / stretched nylon (acrylic resin is film-like or liquid coating and cured by drying) 8) Acrylic resin + polysiloxane graft acrylic resin / Stretched nylon (Acrylic resin is film,
Or, it is cured by drying after liquid coating) Further, at least the base material layer 11 is generally a polyolefin represented by erucic acid amide, oleic acid amide, stearic acid amide, bis-erucic acid amide, bisoleic acid amide, and bisstearic acid amide. At least one of the lubricants added internally to the system resin is made into a solution with a solvent such as isopropyl alcohol, ethyl acetate, toluene, and methyl-ethyl-ketone, and then coated and applied to improve surface slipperiness and moldability. It turned out to do.

The barrier layer 12 is a layer for preventing water vapor from entering the inside of the battery from the outside, and stabilizes the pinhole of the barrier layer itself and the processability (pouching, embossing formability). In addition, a metal having a thickness of 15 μm or more, such as aluminum or nickel, or a film obtained by vapor deposition of an inorganic compound, for example, silicon oxide, alumina, or the like in order to have a pinhole resistance is also exemplified, but the thickness is preferably the barrier layer. Is 20 to 80 μm of aluminum. In order to further improve the occurrence of pinholes and to prevent the occurrence of cracks and the like in embossing when the battery exterior body type is an embossed type, the inventors of the present invention used a material of aluminum used as a barrier layer. However, by setting the iron content to 0.3 to 9.0% by weight, preferably 0.7 to 2.0% by weight, the malleability of aluminum is better than that of aluminum containing no iron. It has been found that the occurrence of pinholes due to bending is reduced in the laminated body, and the side walls can be easily formed when the embossed type outer casing is formed. When the iron content is less than 0.3% by weight, effects such as prevention of pinholes and improvement of embossing formability are not observed, and the iron content of the aluminum exceeds 9.0% by weight. In this case, the flexibility as aluminum is impaired and the bag-making property as a laminate is deteriorated.

Aluminum produced by cold rolling has its flexibility and flexibility under annealing (so-called annealing) conditions.
Although the strength / hardness of the waist changes, the aluminum used in the present invention is
Aluminum, which tends to be soft with some or complete annealing, is preferred. The degree of flexibility, waist strength, and hardness of aluminum, that is, the annealing condition, is
It may be appropriately selected depending on the workability (pouching, embossing). For example, in order to prevent wrinkles and pinholes during embossing, it is desirable to use annealed soft aluminum according to the degree of molding.

The inventors of the present invention were able to obtain a laminate satisfying the packaging material by subjecting the front and back surfaces of aluminum, which is the barrier layer 12 of the battery packaging material, to chemical conversion treatment. The chemical conversion treatment is specifically to prevent delamination between aluminum and the base material layer during embossing by forming an acid resistant film such as phosphate, chromate, fluoride, and triazine thiol compound. And hydrogen fluoride generated by the reaction between the battery's electrolyte and water prevents aluminum surface dissolution and corrosion, especially aluminum oxide present on the aluminum surface, and prevents the aluminum surface from adhering. Property (wettability) is improved, delamination between the base material layer 11 and aluminum 12 during embossing and heat sealing is prevented, and delamination on the aluminum inner surface side due to hydrogen fluoride generated by the reaction between the electrolyte and water. It has been confirmed that a preventive effect can be obtained. Using various substances,
As a result of conducting a chemical conversion treatment on the aluminum surface and studying the effect thereof, phosphoric acid using among the above-mentioned acid-resistant film-forming substances, which is composed of three components of phenol resin, chromium fluoride (3) compound and phosphoric acid The chromate treatment was good. Alternatively, a chemical conversion treatment agent containing a metal such as molybdenum, titanium, zircon, or a metal salt in a resin component containing at least a phenol resin was favorable.

When the battery exterior body is a pouch type,
When the aluminum is chemically converted into a pouch, it may be applied on one side only on the sealant layer side or on both the base material layer side and the sealant layer side. When the outer casing of the battery is an embossed type, delamination between the aluminum and the base material layer at the time of embossing can be prevented by performing chemical conversion treatment on both sides of aluminum.

When the lead wire film 20 of the present invention is applied, the sealant layer of the outer package is, as described above,
(1) α-olefin polymer, (2) ethylene-α-olefin copolymer, (3) propylene-α-olefin copolymer, (4) unsaturated carboxylic acid graft-modified α- Olefin polymer and α-olefin copolymer, (5) copolymer of ethylene and acrylic acid or acrylic acid derivative, (6) copolymer of ethylene and methacrylic acid or methacrylic acid derivative, (7) metal It is selected from ion-crosslinked α-olefin polymers or copolymers of ethylene and α-olefins. Examples of the α-olefin polymers and copolymers include low density polyethylene, medium and high density polyethylene, Linear low density polyethylene, polyethylene graft-polymerized with unsaturated carboxylic acid, homo-type polypropylene, block-type polypropylene , A random type polypropylene, etc., a copolymer of ethylene and propylene, a copolymer of ethylene, propylene and butene, a simple substance of polypropylene grafted with an unsaturated carboxylic acid, or a single layer or a multilayer using a blended product. Can be used. Further, the sealant layer 14 made of a polyolefin resin and the adhesive resin layer are made of a butene component, a terpolymer component made of a three-component copolymer of ethylene, butene and propylene, and a low crystalline ethylene and butene having a density of 900 kg / m ³ . Copolymer, amorphous ethylene-propylene copolymer, propylene α-olefin copolymer component,
It is also possible to add an isoprene rubber component or the like.

When laminating the battery packaging material forming the outer casing applied to the lead wire film of the present invention, the chemical conversion treatment layer provided on the barrier layer and the sealant layer can be bonded by, for example, a lithium ion battery or the like. In order to prevent delamination due to hydrofluoric acid or the like generated by the reaction between the electrolytic solution and water in (1), it is desirable to perform the laminating and adhesion stabilizing treatments described below.

As a result of earnest research on a laminating method exhibiting stable adhesive strength, the present inventors dry-laminated the barrier layer 12 and the substrate layer 11 which had been subjected to the chemical conversion treatment on at least the surface on which the sealant layer is laminated, and As shown in FIG. 2 (a), the chemical conversion treatment layer 15 provided on the barrier layer 12 and the sealant layer 14 are laminated by a dry laminating method 13d, or as shown in FIG. An acid-modified polyolefin emulsion was applied to the chemical conversion treatment layer and dried and baked for 13 hours.
After that, it was confirmed that the predetermined adhesive strength was obtained also by laminating the film 14 serving as the sealant layer by the thermal laminating method.

It was also confirmed that stable adhesive strength can be obtained by the following laminating method. For example, the base layer 11 and one surface of the barrier layer 12 are dry-laminated, and the acid-modified polyolefin 13e is extruded on the other surface (chemical conversion treatment layer) of the barrier layer 12 as shown in FIG. When the layer 14 is sandwich-laminated, or after the acid-modified polyolefin resin 13 and the sealant layer are coextruded to form a laminate, the obtained laminate is subjected to the conditions where the acid-modified polyolefin resin has a softening point or higher. By heating, it was possible to obtain a laminate having a predetermined adhesive strength. Specific methods of heating include hot roll contact type, hot air type, near or far infrared rays, etc., but any heating method may be used in the present invention, and as described above, the adhesive resin softens. It suffices if it can be heated above the point temperature.

As another method, in the above sandwich lamination or coextrusion lamination, heating may be performed under the condition that the surface temperature of the aluminum 12 on the sealant layer side reaches the softening point of the acid-modified polyolefin resin. It was possible to obtain a laminate with stable adhesive strength. It is also possible to use polyethylene resin as the adhesive resin, but in this case, it is desirable to laminate while laminating the aluminum-side laminating surface of the extruded polyethylene molten resin film.

In the battery packaging material of the present invention, the respective layers in the laminate forming the outer package have appropriate film-forming properties, lamination processing, and final product secondary processing (pouching, embossing) suitability. For the purpose of improving and stabilizing, surface activation treatment such as corona treatment, blast treatment, oxidation treatment and ozone treatment may be performed.

[0042]

EXAMPLES Regarding the battery lead wire film of the present invention,
This will be described more specifically with reference to Examples. The conditions common to the examples and comparative examples are as follows. (1) The layer structure of the laminate used for the exterior body is as follows: stretched nylon 25 μm / adhesive layer / chemical conversion treatment layer / ALM 40 μm / chemical conversion treatment layer / adhesive resin layer 15 / sealant 30 μm (sealant is polypropylene or linear low density polyethylene Unless otherwise specified, the laminated bodies used in Examples and Comparative Examples were laminated as follows. The exterior body was embossed type. 40
A chemical conversion treatment layer by chromate treatment is provided on both sides of μm aluminum, and a stretched nylon film 2 is provided on one side thereof.
Dry-laminate 5 μm and attach adhesive resin 15 to the other surface.
μm was extruded and 30 μm of the sealant film was sandwich laminated to form a primary laminate, and this primary laminate was heated above the softening point of the adhesive resin to obtain a secondary laminate. (The adhesive resin was unsaturated carboxylic acid grafted propylene when the sealant was polypropylene and unsaturated carboxylic acid grafted polyethylene when the sealant was linear low density polyethylene). In the chromate treatment, an aqueous solution containing a phenol resin, a chromium fluoride (3) compound and phosphoric acid was applied by a roll coating method as a treatment liquid in both Examples and Comparative Examples, and the coating temperature was 180 ° C. or higher. It was baked under the following conditions. The amount of chromium applied was 2 mg / m ² (dry weight). Next, the obtained secondary laminate was embossed to form a tray. The secondary laminate that was not molded was used as a lid body to form an exterior body. (2) Each type of the outer package is a single-sided embossing type, and the embossing die of the tray has a recess (cavity) shape of 30 mm.
× 50 mm, depth 3.5 mm. (3) Lead wire The material of the lead wire is aluminum and nickel,
The width was 4 mm and the thickness was 100 μm. (3) Abbreviations Abbreviations used in the following description are as follows. Main resin PE: Linear low-density polyethylene PEa: Polyethylene PP grafted with unsaturated carboxylic acid: Copolymer of ethylene and propylene PPa: Copolymer of ethylene and propylene graft-modified with unsaturated carboxylic acid TPX: 4-methyl-1-pentene homopolymer TPX copolymer: 4-methyl-1-pentene homopolymer and ethylene, propylene, butene, hexene and other α-olefins (4- Resin TPX blended with (except methyl-1-pentene): Blend of TPX with other resin {inside ()} TPXa: Unsaturated carboxylic acid graft-modified 4-methyl-1-pentene polymer TPX Copolymer a: 4-methyl-1-pentene homopolymer and ethylene, propylene, butene, hexene and the like having 2 to 2 carbon atoms. The resin TPXa blend obtained by graft-modifying what was copolymerized with α-olefin (excluding 4-methyl-1-pentene) with an unsaturated carboxylic acid: TPXa with another resin {inside ()} blend TPX Copolymerized α-olefin TPX-H: 1-hexene blend resin PB: polybutene EP: copolymer of ethylene and propylene EB: copolymer of ethylene and butene (4) Lead wire consisting of the multilayer Regarding the layers of the film for use, the heat-resistant resin layer was the central layer, the layer on the sealant side was the S layer, and the layer on the lead wire side was the M layer. (5) Method for producing lead wire film Multilayer method for making lead wire film in multiple layers All were coextrusion film forming methods. [Example 1] A sealant of the outer package was linear low-density polyethylene, and a battery body in which a lead wire film was temporarily attached to a predetermined position of the lead wire was placed in a tray of the outer package,
The lid was covered, and the peripheral edge of the tray was sealed by heat sealing to obtain a sample of Example 1. The lead wire film has an S layer of 20 μm PE and a heat resistant resin layer of TPX copolymer a (TP
X-H) 50 μm, M layer was PEa 30 μm to form a three-layer film. [Example 2] The sealant of the outer package was made of linear low-density polyethylene, and the battery main body in which the lead wire film was temporarily attached at a predetermined position of the lead wire was placed in the tray of the outer package,
The lid was covered, and the peripheral edge of the tray was sealed by heat sealing to obtain a sample of Example 2. The lead wire film has an S layer of PEa of 15 μm and a heat resistant resin layer of TPX blend (E
B) 5 μm and TPXa 60 μm and TPX blend (E
B) 3 μm with 5 μm, Ma layer with PEa of 15 μm, and a lead wire film with 5 layers. [Example 3] A battery main body, in which polypropylene was used as a sealant of the outer package and a lead wire film was temporarily attached to a predetermined position of the lead wire, was placed in a tray of the outer package to cover the lid, The peripheral edge of the tray was sealed by heat sealing to obtain a sample of Example 3. The lead wire film has an S layer of PP
60μm, heat resistant resin layer TPXa blend (EP) 10
A three-layer film having a Pm of 30 μm and an M layer of 30 μm was prepared. [Example 4] A battery main body in which a sealant of the outer package was polypropylene and a lead wire film was temporarily attached to a predetermined position of the lead wire was placed in a tray of the outer package to cover the lid, The peripheral edge of the tray was sealed by heat sealing to obtain a sample of Example 4. The lead wire film has an S layer of PP
40μm, heat-resistant resin layer TPXa blend (PB) 5μ
m and TPX 10 μm and TPXa blend (PB) 5 μm
And the M layer was PPa 40 μm, the lead wire film had 5 layers.

[Comparative Example 1] A battery main body, in which polypropylene was used as a sealant for the outer package and a lead wire film was temporarily attached to a predetermined position of the lead wire, was placed in a tray of the outer package to cover the lid. Then, the peripheral edge of the tray was sealed by heat sealing to obtain a sample comparative example 1. The lead wire film is
It was a single layer film of PPa 100 μm. [Comparative Example 2] A battery main body, in which a sealant of the outer package is polypropylene and a lead wire film is temporarily attached to a predetermined position of the lead wire, is placed in a tray of the outer package to cover the lid, The peripheral edge of the tray was sealed by heat sealing to obtain a sample comparative example 2. The lead wire film has an S layer of PP
60 μm, heat-resistant resin layer TPXa 10 μm, M layer PP
There were three layers of 40 μm. [Comparative Example 3] Other examples except that polypropylene was used as the sealant of the exterior body, and no chemical conversion treatment was applied to both surfaces of aluminum in the production of the laminate of the exterior body.
The same exterior body as that of the comparative example was used. The battery main body, in which the lead wire film was temporarily attached to the lead wire at a predetermined position, was placed in the tray of the exterior body, the lid body was covered, and the periphery of the tray was sealed by heat sealing. And The lead wire film has an S layer of 40 μm PP and a heat resistant resin layer of TP
3 layers of Xa blend (EB) 5 μm, TPX10 and TPXa blend (EB) 5 μm, and M layer of PPa 40 μm
A five-layer film having a thickness of m was used.

<Evaluation Method> (1) Confirmation of Short Circuit by Heat Sealing After sealing and sealing under conditions of 190 ° C., 2.0 MPa, and 3.0 seconds, the presence or absence of electricity (short circuit) between the lead wire and the barrier layer. It was judged. (2) Leakage from the heat-sealed portion of the lead wire was confirmed when the leak outer package was filled with the electrolytic solution and then stored at 60 ° C. and 90% RH for 7 days. Electrolyte solution: 3 g of a mixed solution of ethylene carbonate, diethyl carbonate and dimethyl carbonate (1: 1: 1) so as to be 1M LiPF ₆ . (3) Heat-resistant short circuit of heat-sealed product After being hermetically sealed under the conditions of 190 ° C, 1.0 MPa, and 3.0 seconds, after being stored at 160 ° C for 2 hours, electricity (short circuit) between the lead wire and the barrier layer It was judged by the presence or absence. (4) Confirmation of delamination After filling the exterior body with the electrolytic solution, it was stored at 80 ° C for 24 hours, and the delamination (hereinafter referred to as delamination) of the laminate on the content side was confirmed. Electrolyte solution: 3 g of a mixed solution of ethylene carbonate, diethyl carbonate and dimethyl carbonate (1: 1: 1) so as to be 1M LiPF ₆ .

<Results> In each of Examples 1 to 10, there was no short circuit or leakage during heat sealing, or heat resistant short circuit after heat sealing. However, in Comparative Example 1, although neither leakage nor delamination occurred, a short circuit during heat sealing and a heat resistant short circuit after heat sealing occurred in the nickel lead wire. In Comparative Example 2, there was no short circuit during heat-sealing, heat-resistant short circuit after heat-sealing, and no damage, but leakage occurred from the heat-sealed portion of the lead wire. In Comparative Example 3, neither short-circuiting during heat sealing, heat-resistant short-circuiting after heat sealing nor leakage from the heat-sealed portion of the lead wire occurred, but during the leakage test, the barrier layer of the outer package was not tested. Delamination occurred between (aluminum) and the adhesive resin layer.

[0046]

When the battery body is housed in the pouch or the embossed portion of the outer package formed from the battery packaging material of the present invention and the periphery thereof is heat-sealed and sealed, the battery lead wire and the outer package are separated from each other. The lead wire film
4-grafted with at least unsaturated carboxylic acid
The multilayer structure including the heat-resistant resin layer made of a methyl-1-pentene polymer prevents the barrier layer of the outer package and the lead wire from coming into contact (short-circuit) with each other when the battery is hermetically sealed. .

[Brief description of drawings]

FIG. 1 is a diagram illustrating a lead wire film of the present invention,
(A) A cross-sectional view showing the layer structure of the lead wire film,
(B) It is a figure explaining the material and positional relationship (one side) of a battery lead wire, an exterior body, and a film for lead wires, and (c) A schematic sectional view of a lead wire part after heat sealing.

FIG. 2 is a cross-sectional view showing an example of a layer structure of a laminated body forming an outer casing of a battery.

FIG. 3 is a perspective view illustrating a method for mounting a lead wire film in bonding a battery packaging material and a lead wire.

FIG. 4 is a diagram illustrating a method of interposing the lead wire film between the lead wire and the outer casing in the present invention.

FIG. 5 is a perspective view illustrating a battery pouch-type exterior body.

FIG. 6 is a perspective view illustrating an embossed type outer casing of a battery.

FIG. 7 illustrates molding in an embossed type,
(A) perspective view, (b) embossed outer casing body,
(C) X ₂ -X ₂ parts cross-sectional view, an enlarged view (d) Y ₁ parts.

FIG. 8 is a cross-sectional view showing a state in which a barrier layer and a lead wire are short-circuited using a conventional lead wire film.

[Explanation of Codes] S Short section between lead wire and barrier layer H Heat seal hot plate wk Temporary attachment mk Welding 1 Battery 2 Battery body 3 Cell (electric storage part) 4 Lead wire (electrode) 5 Exterior body 7 Recess 8 Side wall 9 seal part 10 laminated body (packaging material for batteries) 11 base material layer 12 aluminum (barrier layer) 13 adhesive layer (adhesive resin layer) between barrier layer and sealant layer 13d dry laminate layer 13e acid extruded layer 13h of acid-modified polyolefin acid Modified polyolefin coating baking layer 14 sealant layer 15 protective layer 16 adhesive layer between base material layer and barrier layer 20 lead wire film laminate 21 sealant side resin layer 22 heat resistant resin layer 23 lead wire side resin layer 30 press molding part 31 Male 32 Female 33 Cavity

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masataka Okushita             1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo             Dai Nippon Printing Co., Ltd. F-term (reference) 4F100 AK01B AK01C AK03C AK04A                       AK04J AK07A AK07J AK08A                       AK08B AK08J AK09A AK09J                       AK24A AK24J AK29A AK62A                       AK62C AK66A AK66C AK70B                       AK70C AK71C AL01A AL01B                       AL04A AL05A AL07A AL07B                       AL07C AN02A BA02 BA03                       BA04 BA05 BA10A BA10B                       BA10C GB17 GB41 JG10                       JJ03A JL12B JL12C                 5H011 AA03 AA17 CC02 CC06 CC10                       DD03 DD09 DD13 DD23 EE04                       FF04 GG08 HH02 HH03 HH12                       HH13 KK05                 5H022 BB12 BB19 CC03 EE10

Claims (10)

[Claims] 1. An elongated plate or rod-shaped metal lead wire body is sandwiched by a peripheral seal portion of an exterior body in which a battery body is housed in an exterior body made of a laminate having a heat-sealing property on an inner surface, When sealing the peripheral edge of the exterior body,
A film which is interposed between the laminate and the lead wire body, comprising a heat-resistant resin layer composed of at least a 4-methyl-1-pentene polymer graft-modified with an unsaturated carboxylic acid. A film for lead wires, which is characterized by being present. 2. The lead wire film according to claim 1, wherein the heat-resistant resin layer comprises a 4-methyl-1-pentene homopolymer graft-modified with an unsaturated carboxylic acid. 3. A 4-methyl-1-pentene homopolymer having a heat-resistant resin layer graft-modified with an unsaturated carboxylic acid,
(1) 4-methyl-1-pentene homopolymer, 4-methyl-1-pentene homopolymer and ethylene, propylene,
Copolymers with butene, hexene and other α-olefins having 2 to 20 carbon atoms (excluding 4-methyl-1-pentene), (2) α-olefin polymers, ethylene-α-olefin copolymers, propylene (1) or (2) of a blending resin selected from a copolymer of styrene and α-olefin, an unsaturated carboxylic acid graft-modified α-olefin polymer and α-olefin copolymer, and butadiene rubber The lead wire film according to claim 1, wherein at least one of the above is a blended resin. 4. A heat-resistant resin layer comprising a 4-methyl-1-pentene homopolymer and ethylene, propylene, butene, hexene or other α-olefin (4-methyl-) having 2 to 20 carbon atoms.
The film for lead wire according to claim 1, which is a resin obtained by graft-modifying a copolymer of (except for 1-pentene) with an unsaturated carboxylic acid. 5. The heat-resistant resin layer comprises a 4-methyl-1-pentene homopolymer and an α-olefin (4-methyl-) having a carbon number of 2 to 20, such as ethylene, propylene, butene and hexene.
(Excluding 1-pentene) to a resin graft-modified with an unsaturated carboxylic acid (1) 4-methyl-1-pentene homopolymer and 4-methyl-1-pentene homopolymer Copolymers with α-olefins (excluding 4-methyl-1-pentene) having 2 to 20 carbon atoms such as ethylene, propylene, butene, and hexene, (2) α-olefin polymers, ethylene-α-olefin copolymers Polymers, copolymers of propylene and α-olefins, α-olefin polymers graft-modified with unsaturated carboxylic acid and α
The lead wire according to claim 1, wherein at least one of the blending resins (1) or (2) selected from olefin copolymers and butadiene rubber is a blended resin. the film. 6. At least one surface of the heat-resistant resin layer is a layer having heat sealability with the inner surface of the laminate, and the other surface is a layer having heat sealability with respect to metal. The lead wire film according to any one of claims 1 to 5. 7. A layer having heat sealability with the inner surface of the laminate is (1) α-olefin polymer, (2) ethylene and α
-Copolymer with olefin, (3) Copolymer with propylene and α-olefin, (4) α-olefin polymer and α-olefin copolymer modified with unsaturated carboxylic acid graft, (5) Copolymer of ethylene and acrylic acid or acrylic acid derivative, (6) Copolymer of ethylene and methacrylic acid or methacrylic acid derivative, (7) Metal ion cross-linked α-olefin polymer or ethylene and α-olefin 7. The lead wire film according to claim 1, wherein the lead wire film is made of a resin selected from the group consisting of: 8. A layer having a heat-sealing property with respect to a metal comprises (1) an unsaturated carboxylic acid graft-modified α-olefin polymer and α-olefin copolymer (2) ethylene and acrylic acid or acrylic acid. Copolymer with derivative, (3) Copolymer of ethylene with methacrylic acid or methacrylic acid derivative, (4) Metal ion cross-linked α
The lead wire film according to any one of claims 1 to 7, comprising a resin selected from an olefin polymer or a copolymer of ethylene and α-olefin. 9. A battery main body is inserted into an outer package formed of a laminate comprising at least a base material layer, an adhesive layer, aluminum, a chemical conversion treatment layer, and a polyolefin resin sealant layer, and the outer periphery of the outer package is heated. A packaging material for a battery, wherein the lead wire film according to any one of claims 1 to 8 is interposed between the outer package and the lead wire at the time of sealing. 10. A battery characterized in that a battery main body composed of cells and lead wires is sealed and sealed in an exterior body made of the packaging material according to claim 9.