JP2001332228A - Packaging material for lithium battery, and its manufacture method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging material for lithium battery, that has physical property of protecting lithium battery proper and proper productivity, and to provide its manufacture method. SOLUTION: The packaging material for lithium battery comprises layers at least of base material, adhesive, aluminum, formation processing and heat seal, and the heat seal layer is a polyethylene series resin, containing at least a layer of medium-density polyethylene with density of not less than 0.935 and MFR of 1 to 15 g/10 sec. Its manufacture method is, when a resin forming the heat seal layer with extrusion method is formed into a laminated body, to laminate the laminated surface of molten film of the extruded resin while subjecting it to ozone processing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging material for a lithium battery having a liquid or solid organic electrolyte (polymer polymer electrolyte) having moisture resistance and content resistance.

[0002]

2. Description of the Related Art A lithium battery, also called a lithium secondary battery, is a battery having a polymer electrolyte and generating an electric current by the movement of lithium, wherein the positive and negative electrode active materials are made of a polymer. Including. The structure of the lithium secondary battery is as follows: a positive electrode current collector (aluminum, nickel) / a positive electrode active material layer (a metal positive electrode material such as metal oxide, carbon black, metal sulfide, electrolyte solution, polyacrylonitrile) / an electrolyte layer (propylene) Carbonate,
Carbonate-based electrolytes such as ethylene carbonate, dimethyl carbonate, and ethylene methyl carbonate; inorganic solid electrolytes composed of lithium salts; gel electrolytes) / Negative electrode active materials (lithium metals, alloys, carbon, electrolytes, polymer anode materials such as polyacrylonitrile) ) / Negative electrode current collector (copper,
(Nickel, stainless steel) and an outer package for packaging them. Lithium batteries are used for personal computers, portable terminal devices (mobile phones, PDAs, etc.), video cameras, electric vehicles, storage batteries for energy storage, robots, satellites, and the like. As the exterior body of the lithium battery, a metal can formed by pressing a metal into a cylindrical or rectangular parallelepiped container, or a laminate formed of a base material layer, aluminum, and a sealant layer is formed in a bag shape. Was used.

[0003]

However, there have been the following problems as an exterior body of a lithium battery. 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 of the shape is reduced. Therefore, a pouch type in which the laminated body is stored in a bag shape to accommodate the lithium battery main body, or an embossed type in which the laminated body is press-formed to form a concave portion and the lithium battery main body is accommodated in the concave portion has been developed. The embossed type provides a more compact package as compared to the pouch type. Regardless of the type of exterior body, the moisture resistance or puncture resistance of the lithium battery, and the insulating properties and the like are essential for the exterior body of the lithium battery. And, as a packaging material for a lithium battery, generally, a laminate including at least a base material layer, a barrier layer, and a heat seal layer is used. Further, it has been confirmed that the adhesive strength between the layers affects the properties required for the exterior body of the lithium battery. For example, if the adhesive strength between the barrier layer and the heat seal layer is insufficient, it causes moisture to enter from the outside, and hydrogen fluoride generated by the reaction between the electrolyte in the components forming the lithium battery and the moisture. The aluminum surface is corroded by the acid, and delamination occurs between the barrier layer and the heat seal layer. In addition, when forming the embossed type exterior body, the laminate is press-molded to form a concave portion. During this molding, delamination may occur between the base material layer and the barrier layer. . Therefore, the present inventors applied an acid-modified polypropylene emulsion to the aluminum surface and baked the film to form a film. The adhesive resin layer made of the acid-modified polypropylene resin and the heat seal layer made of the polypropylene resin were used together. It was confirmed that if the laminate was formed by extrusion, the adhesive strength of the laminate could be improved, but the baking after the emulsion coating of the acid-modified polypropylene was time consuming and the production efficiency was not good. Further, in order to prevent the delamination, a resin having a problem in workability and economy, such as an acid-modified polyolefin or a metal cross-linked polyethylene, is sometimes used as a resin to be laminated on the aluminum surface. When a low-density polyethylene or linear low-density polyethylene is used for the heat seal layer, in the case where there is a punching step using a die-set type punching die, the laminate is poorly cut, and burrs are generated at the punched portions, Sometimes it was impossible to pull out. An object of the present invention is to provide, as a material used for a lithium battery package, a protective material for a lithium battery main body and a highly productive lithium battery packaging material and a method for producing the same.

[0004]

The above objects can be attained by the present invention described below. That is, the invention according to claim 1 comprises at least a base material layer, an adhesive layer, aluminum, a chemical conversion treatment layer, and a heat seal layer, and the heat seal layer is a polyethylene resin, and the packaging material for a lithium battery is characterized in that The heat-sealing layer may have a density of 0.935 or more and an MFR of
The packaging material for a lithium battery according to claim 1, wherein the polyethylene resin layer is a polyethylene resin layer containing at least one medium-density polyethylene of 15 g / 10 sec. Is a phosphoric acid chromate treatment, showing the packaging material for a lithium battery according to claim 1. The invention described in claim 4 is
The present invention relates to the method for producing a packaging material for a lithium battery according to any one of claims 1 to 3, wherein a resin for forming a heat seal layer is formed by an extrusion method into a laminate.
The method is characterized in that the lamination surface of the extruded resin melt film is laminated while performing ozone treatment.

[0005] The invention described in claim 5 at least,
A packaging material for a lithium battery, comprising a base material layer, an adhesive layer, aluminum, a chemical conversion treatment layer, an adhesive resin layer, and a heat seal layer, wherein the adhesive resin layer and the heat seal layer are polyethylene resins. The invention according to claim 6 is the invention according to claim 5, wherein the heat seal layer is a polyethylene resin layer containing at least one medium density polyethylene having a density of 0.92 or more and a MFR of 1 to 15 g / 10 seconds. The invention described in claim 7 is also characterized in that the chemical conversion treatment is a phosphoric acid chromate treatment.

The invention according to claim 8 is a method for producing a packaging material for a lithium battery according to any one of claims 5 to 7, wherein a chemical conversion treatment is performed on one surface of aluminum to form a base material and the chemical conversion treatment. After dry laminating the surface not subjected to the treatment, the adhesive resin layer and the heat seal layer are coextruded on the surface subjected to the chemical conversion treatment, and the laminating surface on the aluminum side of the adhesive resin layer formed into a molten film is treated with ozone. The invention according to claim 9 is also a method for producing a packaging material for a lithium battery according to any one of claims 5 to 7, wherein the method includes the steps of: One side is subjected to a chemical conversion treatment, and the base material and the surface not subjected to the chemical conversion treatment are dry-laminated, and then the adhesive resin layer is extruded onto the surface subjected to the chemical conversion treatment, and the film to be the heat seal layer is sandwiched. When Tchiramineto, the laminate surface of the aluminum surface of the molten film of the adhesive resin is a method characterized by laminating with ozone treatment.

[0007] The invention according to claims 10 to 13 is:
The method for producing a packaging material for a lithium battery according to any one of claims 8 and 9, wherein a medium-density polyethylene is used as the adhesive resin layer (claim 10). A method characterized by using a linear low-density polyethylene (Claim 11), and a method characterized by heating the obtained laminate to a temperature higher than the softening point of the adhesive resin by post-heating (Claim 11). Item 1
2) A method of laminating by heating the surface of the aluminum facing the molten film to a condition that is equal to or higher than the softening point of each molten film (claim 13).

The invention according to claim 14 is characterized by comprising at least a base material layer, an adhesive layer, a chemical conversion treatment layer 1, aluminum, a chemical conversion treatment layer 2, and a heat seal layer, wherein the heat seal layer is a polyethylene resin. According to a fifteenth aspect of the present invention, in the lithium battery packaging material according to the fifteenth aspect, the heat seal layer has a density of 0.1.
This indicates that the polyethylene is a medium-density polyethylene having a MFR of 935 or more and a MFR of 1 to 15 g / 10 seconds. In the invention according to the sixteenth aspect, similarly, in the invention according to the fourteenth aspect, the chemical conversion treatment is a phosphate chromate treatment. Indicates that

The invention according to claim 17 is the invention according to claims 14 to
17. An invention relating to the method for producing a packaging material for a lithium battery according to claim 16, wherein both surfaces of aluminum are subjected to a chemical conversion treatment, and a base material and one surface subjected to the chemical conversion treatment are dry-laminated, and then the chemical conversion treatment is performed. A method of forming a heat-sealing layer resin on the other surface by extrusion, forming a laminate by laminating the laminated surface of the molten film of the extruded resin while performing ozone treatment. It is.

[0010] The invention according to claim 18 comprises at least a base material layer, an adhesive layer, a chemical conversion treatment layer 1, aluminum, a chemical conversion treatment layer 2, and a heat seal layer, and the adhesive resin layer heat seal layer has a density of 0.92. As described above, the present invention relates to a packaging material for a lithium battery, which is a polyethylene resin layer containing at least one medium-density polyethylene having a MFR of 1 to 15 g / 10 seconds. It shows that the chemical conversion treatment in the invention is a phosphoric acid chromate treatment.

According to a twentieth aspect of the present invention, there is provided a method for manufacturing a packaging material according to the eighteenth and nineteenth aspects, wherein the base material layer, the adhesive layer, the chemical conversion treatment layer 1, the aluminum and the chemical conversion treatment layer 2 are provided. , An adhesive resin layer and a heat seal layer, wherein the heat seal layer has a density of 0.92 or more,
In forming a lithium battery packaging material that is a polyethylene resin layer containing at least one layer of medium-density polyethylene of 5 g / 10 seconds, both surfaces of aluminum are subjected to a chemical conversion treatment,
After dry laminating the base material and one surface subjected to the chemical conversion treatment, the adhesive resin layer and the heat seal layer were co-extruded to the other surface subjected to the chemical conversion treatment to form a molten film of the adhesive resin layer. A method for producing a packaging material for a lithium battery, comprising laminating a laminate surface on an aluminum surface side while performing ozone treatment.

Further, the invention according to claim 21 is also an invention relating to the method for producing a packaging material according to claims 18 and 19, wherein the base material layer, the adhesive layer, and the chemical conversion treatment layer 1 are provided.
Aluminum, chemical conversion layer 2, adhesive resin layer, heat seal layer, heat seal layer density 0.92 or more, M
In forming a packaging material for a lithium battery, which is a polyethylene resin layer containing at least one layer of medium-density polyethylene having an FR of 1 to 15 g / 10 seconds, both surfaces of aluminum are subjected to a chemical conversion treatment, and a substrate and one surface subjected to the chemical conversion treatment. After dry laminating, the adhesive resin layer is extruded on the other surface subjected to the chemical conversion treatment, and when the film to be the heat seal layer is sandwich-laminated, the laminated surface on the aluminum side of the molten film of the adhesive resin is laminated. This is a method characterized in that lamination is performed while performing ozone treatment. The invention according to claim 22 is a method for producing a packaging material for a lithium battery according to any one of claims 20 and 21,
A medium density polyethylene is used as the adhesive resin layer, and the invention according to claim 23 is the same as the method for manufacturing a packaging material for a lithium battery according to claim 20 or claim 21, wherein the adhesive resin layer is It is characterized by using linear low-density polyethylene.

The invention according to claim 24 is the invention according to claims 20 to
The method for producing a packaging material for a lithium battery according to claim 23, wherein the obtained laminated body is heated by post-heating to a condition that is equal to or higher than a softening point of the adhesive resin. The invention according to claim 25 is also the same as in claim 2.
The method for producing a packaging material for a lithium battery according to any one of claims 0 to 23, wherein the surface of the aluminum facing the molten film is laminated by heating to a temperature equal to or higher than the softening point of each molten film. .

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention provides a moisture-proof property,
Further, it is a packaging material for a lithium battery that has good productivity and is less likely to crack in the heat seal layer. The layer configuration and the manufacturing method of the laminate will be described in more detail with reference to the drawings and the like. FIG. 1 is a cross-sectional view illustrating a configuration of a laminate in a packaging material for a lithium battery of the present invention,
(A) is a case where the laminate is formed by the extrusion lamination method, (b) is a case where the laminate is formed by the sandwich lamination method, and (c) is a case where the laminate is formed by the co-extrusion lamination method. Yes, (d) is Y ₁ part,
(E) is, Y ₂ parts, (f) are each a enlarged view of Y ₃ parts.
FIG. 2 is a perspective view illustrating a pouch type exterior body of a lithium battery. FIG. 3 is a perspective view illustrating an embossed exterior body of a lithium battery. 4A and 4B are views for explaining molding in an emboss type, and FIG.
Embossed molded outer body, (c) X ₂ -X ₂ parts cross-sectional view, an enlarged view (d) Y ₄ parts. FIG. 5 is a conceptual diagram illustrating a sandwich lamination method for producing a packaging material for a lithium battery. FIG. 6 is a conceptual diagram illustrating a co-extrusion lamination method for producing a packaging material for a lithium battery. FIG. 7 is a perspective view illustrating a method of mounting an adhesive film in bonding a packaging material for a lithium battery and a tab.

The packaging material for a lithium battery is, for example, nylon / adhesive layer / aluminum / adhesive layer / heat seal layer,
When the heat seal layer is formed by a sandwich lamination method, a dry lamination method, a co-extrusion lamination method, a heat lamination method, or the like, when the lithium battery exterior body is an embossed type, in the press molding, aluminum and a base are formed on the side wall part. Delamination that peels off from the material layer often occurs, and delamination also occurs in a portion where the lithium battery main body is housed in the outer package and the periphery thereof is heat-sealed. In addition, the inner surface of aluminum is attacked by hydrogen fluoride generated by the reaction between electrolyte and water, which are components of the battery,
May cause delamination.

Therefore, the present inventors, at the time of emboss molding,
At the time of heat sealing, it is a laminated body without delamination, and as a result of earnest research on packaging materials that can be satisfied as an exterior body for lithium batteries with content resistance, subjected to chemical conversion treatment on both sides of aluminum, After dry laminating the base material and one surface of the aluminum content side on which the chemical conversion treatment was performed, a resin or film made of polyethylene was coated on the other surface of the chemical conversion treatment, the surface of the chemical conversion treatment layer (2). A laminate obtained by laminating a molten resin film to be a heat seal layer or an adhesive resin layer while applying an ozone treatment to a surface on a chemical conversion treatment side when laminating by an extrusion lamination method, a sandwich lamination method or a co-extrusion lamination method. By applying appropriate heating, the adhesive strength can be improved. According to the present invention, the adhesive resin layer, the heat seal layer As a packaging material for a lithium battery comprising a monitor polyethylene resin, excellent in workability, and,
They have found that satisfactory performance can be imparted using relatively inexpensive materials, and have completed the present invention.

As shown in FIG. 1A, the layer structure of the packaging material for a lithium battery according to the present invention comprises at least a base material layer 11,
Adhesive layer 16, chemical conversion layer 15 (1), aluminum 1
2, a laminate composed of a chemical conversion treatment layer 15 (2) and a heat seal layer 14, or, as shown in FIG. 1 (b), a base material layer 11, an adhesive layer 16, a chemical conversion treatment layer 15 (1), aluminum 12, a chemical conversion layer 15 (2), an adhesive resin layer 13, and a heat seal layer 14.

As shown in FIG. 1A, the first method of the present invention for producing a packaging material for a lithium battery is as follows:
Providing (1), 15 (2), heat seal layer 14
Is directly extruded on the surface of the chemical conversion treatment surface 15 (b) on the content side, and the laminated surface side of the extruded molten resin film to be the heat seal layer is subjected to ozone treatment. And heating the laminated body to a temperature equal to or higher than the softening point of the resin to be the heat seal layer. Medium density polyethylene can be used as the extruded resin.

A second method of the present invention for producing a packaging material for a lithium battery comprises, as shown in FIG. 1B, a chemical conversion treatment layer 15 described later on both surfaces of a barrier layer 12.
(1) The method of providing 15 (2), wherein the heat sealing layer 14 previously formed as a film is sandwiched by extruding the adhesive resin layer 13 on the chemical conversion treatment surface on the side of the contents. This is a method in which the laminate surface side of the molten resin film is subjected to ozone treatment, and the obtained laminate is heated to a temperature equal to or higher than the softening point of the adhesive resin. In this case, a medium density polyethylene or a linear low density polyethylene can be used as the adhesive resin. In addition, medium density polyethylene can be used for the heat seal layer.

A third method of the present invention for producing a packaging material for a lithium battery is as shown in FIG. 1C.
Providing (1) and 15 (2), laminating the heat sealing layer 14 formed in advance as a film by co-extruding the adhesive resin and the resin forming the heat sealing layer on the chemical conversion treatment surface on the contents side. When forming the body, the laminated surface side of the molten resin film of the adhesive resin is laminated while performing ozone treatment, and the obtained laminated body is heated to a temperature equal to or higher than the softening point of the adhesive resin. Is the way. In this case, a medium density polyethylene or a linear low density polyethylene can be used as the adhesive resin. In addition, medium density polyethylene can be used for the heat seal layer.

[0021] The heating may be performed in a laminating step. That is, in the case of the first method in the method for producing a packaging material for a lithium battery of the present invention, FIG.
As shown in FIG. 3, chemical conversion treatment layers 15 (1) and 15 (2), which will be described later, are provided on both surfaces of the barrier layer 12, and the heat seal layer 14 is provided on the surface of the chemical conversion treatment surface 15 (2) on the content side. Is heated to a temperature equal to or higher than the softening point of the resin to be the heat seal layer, and the resin to be the heat seal layer is directly extruded on the heated surface to form a film. The laminating surface side of the molten resin film is subjected to ozone treatment. Medium density polyethylene can be used as the extruded resin.

In the case of the second method in the method for producing a packaging material for a lithium battery, as shown in FIG. 1B, a chemical conversion treatment layer 15 (1 ), 15 (2), and heat-treating the chemical conversion surface on the contents side to a temperature equal to or higher than the softening point of the adhesive resin, and extruding the adhesive resin 13 to form a heat seal layer 14 in advance as a film. When sandwich laminating is performed, ozone treatment is performed on the lamination surface side of the molten resin film of the adhesive resin. In this case, a medium density polyethylene or a linear low density polyethylene can be used as the adhesive resin. In addition, medium density polyethylene can be used for the heat seal layer.

Further, in the case of the third method in the method for producing a packaging material for a lithium battery, as shown in FIG. 1C, a chemical conversion treatment layer 15 (1 ), 15 (2), the chemical conversion treatment surface on the contents side is heated to a temperature higher than the softening point of the adhesive resin, and the adhesive resin and the heat seal layer are co-extruded to form a laminate. In this case, the lamination surface side of the molten resin film of the adhesive resin is laminated while performing ozone treatment. In this case, a medium density polyethylene or a linear low density polyethylene can be used as the adhesive resin. Also,
Medium density polyethylene can be used for the heat seal layer.

In the ozone treatment method of the present invention, the ozone generated by the ozone generator is sprayed on the surface of the molten film to be treated, and the ozone treatment is performed by the ozone treatment.
The aluminum surface side of the extruded resin is polarized, and the adhesive strength between the chemical conversion treated surface of aluminum and the heat sealing layer or the adhesive resin layer is improved. Further, by forming a molten resin film while heating aluminum or forming a molten resin film on aluminum and then heating, the chemically treated surface and the polarized extruded layer are firmly adhered to each other. As an ozone generator, the amount of generated ozone is 0.6 to 10 g / m ³ ,
A flow rate of 2 to 20 L / min is used, and ozone is sprayed in an atmosphere having an ozone concentration of 400 g / m ³ or less.

The conditions for post-heating of the laminate in the present invention are as follows:
After forming the laminate, the laminate is heated to a temperature at or above the softening point of the resin extruded on the chemical conversion treated surface.

In the present invention, the conditions for preheating the laminate are as follows: when laminating the molten resin film, the surface of the chemical conversion treatment layer facing the molten resin is heated to a temperature higher than the softening point of the molten resin. Things.

The lithium battery packaging material forms an outer package for packaging the lithium battery main body. Depending on the type of the outer package, a pouch type as shown in FIG.
There is an embossed type as shown in FIG. 3 (a), FIG. 3 (b) or FIG. 3 (c). The pouch type includes a bag type such as a three-side seal, a four-side seal, and a pillow type. FIG. 2 illustrates the pouch type as a pillow type. In addition, as the embossing type, a concave portion may be formed on one side as shown in FIG. 3A, or a concave portion may be formed on both surfaces as shown in FIG. It may be housed and heat-sealed on the four sides of the periphery to seal.
There is also a type in which concave portions are formed on both sides of a folded portion as shown in FIG. 3 (c), a lithium battery is housed, and three sides are heat-sealed.

In the case where the processing step of the lithium battery outer package of the present invention includes a punching step using a die-set type die, the heat seal layer of the outer package is made of low-density polyethylene,
Alternatively, in the case of linear low-density polyethylene, burrs were generated at the punched portion, resulting in a defective product. Therefore,
The present inventors have conducted research on a material of an exterior body that increases stable productivity even in the above-described punching step, and as a result, as a heat seal layer, a density of 0.935 or more and an MFR of 1 to 15 g.
It has been found that the use of the medium-density polyethylene in / 10 seconds stabilizes the die-set method.

Next, the materials and laminates constituting each layer of the laminate forming the packaging material for a lithium battery according to the present invention will be described.

In the present invention, the base material layer 11 is made of a stretched polyester or nylon film. At this time, as the polyester resin, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, copolyester, Polycarbonate and the like. As nylon, polyamide resin, that is, nylon 6,
Nylon 6,6, a copolymer of Nylon 6 and Nylon 6,6, Nylon 6,10, polymethaxylylene adipamide (MXD6) and the like.

When the base material layer 11 is used as a lithium battery, the base material layer 11 is in direct contact with the hardware.
Basically, a resin layer having an insulating property is preferable. In consideration of the presence of pinholes in the film alone, the occurrence of pinholes during processing, and the like, the base material layer needs to have a thickness of 6 μm or more, and the preferred thickness is 12 to 25 μm.

In the present invention, the base material layer 11 can be laminated to improve the pinhole resistance and the insulation when the battery is used as an outer package. When the substrate layer is formed into a laminate, the substrate layer includes at least one resin layer of two or more layers, and each layer has a thickness of 6 μm or more, preferably 1 μm or more.
2 to 25 μm. As an example of laminating the base material layer,
Although not shown, the following 1) to 7) can be mentioned. 1) Stretched polyethylene terephthalate / stretched nylon 2) Stretched nylon / stretched stretched polyethylene terephthalate Also, mechanical suitability of the packaging material (stability of transportation in packaging machines and processing machines), surface protection (heat resistance, electrolyte resistance) ) When the embossing type is used for the exterior body for a lithium battery as a secondary processing, the base layer is formed for the purpose of reducing the frictional resistance between the mold and the base layer at the time of embossing or when an electrolytic solution is attached. For protection, it is preferable that the base material layer is multi-layered and a fluorine-based resin layer, an acrylic resin layer, a silicone-based resin layer, a polyester-based resin layer, or the like is provided on the surface of the base material layer. For example, 3) Fluorine-based resin / stretched polyethylene terephthalate (fluorine-based resin is formed into a film or liquid coating and then dried) 4) Silicone-based resin / stretched polyethylene terephthalate (silicone-based resin is film-like or liquid 5) Fluorine resin / stretched polyethylene terephthalate /
Stretched nylon 6) Silicone resin / Stretched polyethylene terephthalate / Stretched nylon 7) Acrylic resin / Stretched nylon (Acrylic resin is cured by drying after film-like or liquid coating)

The barrier layer 12 is a layer for preventing water vapor from particularly entering the inside of the lithium battery from the outside, and stabilizes pinholes of the barrier layer alone and processability (pouching, embossability). And a metal such as aluminum or nickel having a thickness of 15 μm or more to have a pinhole resistance, or an inorganic compound, for example, a film obtained by depositing silicon oxide, alumina, or the like. Aluminum having a thickness of 20 to 80 μm. In order to further improve the occurrence of pinholes and to make the type of the exterior body of the lithium battery an embossed type, in order to eliminate the occurrence of cracks and the like in embossing, the present inventors have made the use of aluminum used as a barrier layer. The material has an iron content of 0.3-9.
By setting the content to 0% by weight, preferably 0.7 to 2.0% by weight, the aluminum has good ductility and less occurrence of pinholes due to bending as a laminate, compared to aluminum containing no iron. It has been found that the side wall can be easily formed when the embossed type exterior body is molded. The iron content is 0.3% by weight
If less than the above, no effects such as prevention of pinholes and improvement in embossability are observed, and if the iron content of the aluminum exceeds 9.0% by weight, flexibility as aluminum is impaired. As a result, the bag-making properties of the laminate deteriorate.

Further, the aluminum produced by cold rolling has its flexibility and flexibility under the conditions of annealing (so-called annealing treatment).
Although the strength and hardness of the waist change, the aluminum used in the present invention is harder than the hard treated product without annealing.
Aluminum with a tendency to soften slightly or completely annealed is preferred. The degree of flexibility, waist strength, and hardness of aluminum, that is, the conditions of annealing,
What is necessary is just to select suitably according to workability (pouching, embossing). For example, in order to prevent wrinkles and pinholes during embossing, soft aluminum annealed according to the degree of forming can be used.

The inventors of the present invention have conducted intensive studies on the object of the present invention, and as a result, have found that the barrier layer 12
By subjecting the aluminum front and back surfaces to a chemical conversion treatment, a laminate that was satisfactory as the packaging material could be obtained. The chemical conversion treatment is specifically to prevent delamination between aluminum and the substrate layer during embossing by forming an acid-resistant film such as a phosphate, a chromate, a fluoride, and a triazine thiol compound. And the hydrogen fluoride generated by the reaction between the electrolyte of the lithium battery and moisture prevents the dissolution and corrosion of the aluminum surface, especially the dissolution and corrosion of the aluminum oxide present on the aluminum surface, and Improves adhesion (wetability), prevents delamination between the base layer and aluminum during embossing and heat sealing, and prevents delamination on the inner surface of aluminum by hydrogen fluoride generated by the reaction between electrolyte and moisture The effect was obtained. As a result of studying the effect of chemical conversion treatment on the aluminum surface using various substances, among the above-mentioned acid-resistant film-forming substances, phenolic resin, chromium fluoride (3) compound, and phosphoric acid The phosphoric acid chromate treatment using the treated product was good.

The formation of the chemical conversion layer 15 may be performed only on one side of the innermost layer of aluminum when the exterior body of the lithium battery is a pouch type. When the exterior body of the lithium battery is an embossed type, by providing the chemical conversion treatment layers 15 (1) and 15 (2) on both surfaces of aluminum, delamination between the aluminum and the base layer during embossing can be reduced. Can be prevented. A laminate having a chemical conversion treatment on both surfaces of aluminum may be used for the pouch type.

As described above, by using the method for producing a packaging material for a lithium battery of the present invention, a polyethylene resin can be used as the heat seal layer or the adhesive resin layer for laminating the heat seal layer. When the polyethylene film or the acid-modified polyethylene is extruded as an adhesive resin and sandwich-laminated with a polyethylene film, the polyethylene resin to the chemical conversion treatment surface has poor adhesion, and even if the extruded acid-modified polyethylene resin has sufficient adhesiveness, Instead, as a countermeasure, the present inventors applied an emulsion of acid-modified polyethylene to the chemical conversion treated surface by a roll coating method or the like, dried, and baked at a temperature of 170 to 200 ° C. When the above-mentioned acid-modified polyethylene is sandwich-laminated as an adhesive resin, the adhesive strength is improved, but the processing speed of the baking is extremely slow, and the productivity of the adhesive resin layer is poor.

Accordingly, the present inventors have conducted intensive studies on a laminating method that shows stable adhesive strength without application and baking of acid-modified polyethylene. Dry laminating, ozone treatment on the molten film and post-heating of the obtained laminated body, or lamination having a predetermined adhesive strength by performing ozone treatment while heating aluminum when forming the molten film. Could be body.

Specific examples of the heating method include a hot roll contact method, a hot air method, and near or far infrared rays. In the present invention, any heating method may be used. Can be heated above its softening point.

As the resin forming the heat seal layer of the lithium battery packaging material, acid-modified polypropylene, acid-modified polyethylene and the like are used. A polyethylene resin having excellent protection, workability, heat sealability, and the like can be used. Examples of the polyethylene-based resin used here include medium-density polyethylene, low-density polyethylene, linear low-density polyethylene, and high-density polyethylene. As the heat seal layer in the first production method, medium-density polyethylene or It is preferable to use linear low density polyethylene. In the second or third manufacturing method, medium density polyethylene or linear low density polyethylene can be used as the adhesive resin, and medium density polyethylene can be used as the heat sealing layer.

The linear low-density polyethylene includes: a softening point of 70 ° C. or more; a melting point of 112 ° C. or more; and a density of 0.91 or more. The medium-density polyethylene includes: a softening point of 80 ° C. or more; a melting point of 120 ° C. or more; .92 or more ・ MFR 1 to 15 g / 10 sec. As a preferable resin or a combination of the heat seal layer or the adhesive resin layer and the heat seal layer, in the case of single-layer extrusion: a medium-density polyethylene adhesive resin layer as the heat seal layer When forming a heat sealing layer: (1) Medium density polyethylene as an adhesive resin layer / medium density polyethylene as a heat sealing layer (2) Linear low density polyethylene as an adhesive resin layer / medium density polyethylene as a heat sealing layer preferable. The linear low-density polyethylene and the medium-density polyethylene include a low-crystalline ethylene butene copolymer, a low-crystalline propylene butene copolymer, a terpolymer composed of a three-component copolymer of ethylene, butene and propylene, and silica. , A zeolite, an anti-blocking agent (AB agent) such as an acrylic resin bead, a fatty acid amide-based lubricant, or the like.

As a laminate of the packaging material for a lithium battery of the present invention, in addition to the above-mentioned substrate layer, barrier layer, adhesive resin layer and heat seal layer (PE), a laminate between the barrier layer and the heat seal film layer may be used. May be provided with an intermediate layer made of a biaxially stretched film such as polyimide or polyethylene terephthalate. The intermediate layer should be laminated to improve the strength as a packaging material for lithium batteries, improve and stabilize barrier properties, and prevent short circuits due to contact between the tab and the barrier layer during heat sealing of the lithium battery exterior body. There is.

In each of the above-mentioned layers in the laminate of the present invention,
Appropriate surface activation such as corona treatment, blast treatment, oxidation treatment, ozone treatment, etc. for the purpose of improving and stabilizing the suitability for film forming, lamination processing, and final processing of secondary products (pouching, embossing) as appropriate. Processing may be performed. Further, in order to improve the moldability, the heat seal layer or the adhesive resin layer may be coated or impregnated with liquid paraffin at 2 to 6 g / m ² .

However, since polyethylene has no heat-sealing property with respect to metal, the heat-sealing of the tab portion of the lithium battery requires the heat treatment shown in FIGS. 7 (a), 7 (b) and 7 (b).
As shown in (c), by interposing an adhesive film having heat-sealing properties to both metal and PE between the tab and the heat-sealing layer of the laminate, the sealing property at the tab portion is obtained. Will also be assured. The adhesive film is shown in FIG.
(D) As shown in FIGS. 7 (e) and 7 (f), the tab may be wound around a predetermined position. As the adhesive film, the unsaturated carboxylic graft polyolefin,
A film made of metal cross-linked polyethylene or a copolymer of ethylene or propylene and acrylic acid or methacrylic acid can be used.

The base material 11 and the chemical conversion-treated surface of the barrier layer 12 in the packaging material for a lithium battery of the present invention are desirably bonded by a dry lamination method. Said,
Examples of the adhesive used for dry lamination of the base material 11 and the phosphoric acid chromate-treated surface of aluminum include polyester, polyethyleneimine, polyether, cyanoacrylate, urethane, organic titanium, polyether urethane, and epoxy. System, polyester urethane system, imide system, isocyanate system, polyolefin system,
Various silicone adhesives can be used.

[0046]

EXAMPLES The packaging material for a lithium battery of the present invention is described below.
Examples will be described more specifically. Chemical conversion treatment
Displacement may also be caused by phenol resin, chromium fluoride
(3) Roll coating with an aqueous solution comprising a compound and phosphoric acid
Condition by which the coating temperature is 180 ℃ or higher
Baked in Chromium coating amount is 10mg / m^Two
(Dry weight). In each of the following examples and comparative examples
Linear low-density polyethylene (hereinafter referred to as LLDP)
E), having a softening point of 98 ° C. and a melting point of 115 ° C.
MDPE indicates medium density polyethylene. Also,
Zon treatment method uses a slit type nozzle,
Sprayed over the entire width of the extruded film.
For ozone-treated products, the following (A) and (B)
Processing was performed under two conditions. (A) Conditions Flow rate: 20 L / mmin Amount generated: 10 g / m^Three Ozone concentration during ozone treatment: 400 g / m^Three (B) Conditions Flow rate: 2 L / mmin Emission amount: 0.6 g / m^Three Ozone concentration during ozone treatment: 5 g / m^Three Examples 1 to 3, Comparative Examples 1 to 3, Comparative Examples 7 to
Comparative Example 9 and Comparative Example 13 are pouch type exterior bodies,
Both are 50 mm wide and 80 mm long pillow type
Make a pouch, store and seal the lithium battery body
Was. In addition, Examples 4 and 5 and Comparative Examples 4 and 6,
Comparative Examples 10 to 12 and Comparative Example 14
The shape of the concave part (cavity) of the forming die
Press molding with 30 × 50mm and 3.5mm depth
The moldability was evaluated. In each case, the lithium battery
In the seal part of the tab, a thickness of 5
0 μm unsaturated carboxylic acid grafted linear low density polyethylene
Wrap a film of ren around the seal of the tab
Seal. [Example 1] (pouch type) A chemical conversion treatment was performed on one surface of aluminum 20 μm.
Stretched polyester film (thickness 16
μm) by dry lamination, and then
The heat-treated aluminum surface (chemical conversion layer)
MDPE (density 0.93
5, MFR 6.0 g / 10 sec, softening point 114 ° C, melting point 1
25 ° C) as a heat-sealing layer and a thickness of 30 μm
Extruded as a resin film, the laminated surface of the molten resin film
Laminate by extrusion lamination with ozone treatment
Thereafter, the laminate is heated to a temperature equal to or higher than the softening point of MDPE, and
Body Example 1 was obtained. [Example 2] (Pouch type) A chemical conversion treatment was performed on both surfaces of aluminum 20 μm.
Stretched polyester on the chemical conversion treatment layer (1)
Film (thickness 12μm) by dry lamination
Laminating, then other conversion aluminum
When forming a heat seal layer on the surface and chemical conversion treatment layer (2)
In addition, MDPE is used as an adhesive resin layer and melted to a thickness of 30 μm.
Extruded as a resin film, with the aluminum of the molten resin film
Heat-seal layer while ozone treatment
MDPE film (density 0.940, MFR2.
0 g / 10 sec, softening point 114 ° C, melting point 128 ° C, 40μ
m) was sandwich-laminated to form a laminate,
Heat the laminate above the softening point of MDPE and run the sample
Example 2 was obtained. [Example 3] (pouch type) A chemical conversion treatment was performed on one surface of aluminum 20 μm.
Stretched polyester film (thickness 16
μm) by dry lamination, and then
Heat treatment on the surface of chemical conversion treated aluminum and chemical conversion treatment
When forming the seal layer, LLDPE is used as the adhesive resin layer.
MDPE (density 0.924, MF
R 7.0 g / 10 sec, softening point 114 ° C, melting point 126 ° C,
40μm) as heat sealing resin to a thickness of 30μm
Extruded as a molten resin film from a co-extrusion die, the molten resin
Ozone treatment of the laminate surface of the film with aluminum
After co-extrusion lamination to form a laminate, the laminate
Was heated above the softening point of LLDPE,
I got [Example 4] (Emboss type) A chemical conversion treatment was performed on both surfaces of aluminum 40 µm.
Stretched nylon on one surface treated, the surface of the chemical conversion treatment layer (1)
Film (thickness 25μm) is dry-laminated
Laminating, then other conversion aluminum
Surface, the surface of the chemical conversion treatment layer (2), MDPE (density 0.94
0, MFR 8.0 g / 10 sec) as heat seal layer
Extruded as a molten resin film having a thickness of 30 μm,
Do not ozone-treat the surface of the grease film laminated with aluminum.
Then, after extrusion lamination to form a laminate, the laminate
Was heated to above the softening point of MDPE,
Obtained. [Example 5] (Embossed type) A chemical conversion treatment was performed on both surfaces of 40 μm aluminum.
25 μm stretched nylon film on one side
Laminated by Ilaminate method, and then subjected to chemical conversion treatment
LLDPE as adhesive resin on the other side of aluminum
Extruded as a molten resin film to a thickness of 20 μm,
Do not ozone-treat the surface of the grease film laminated with aluminum.
The MDPE film (density)
0.940, MFR12g / 10 seconds, softening point 116 ° C,
Melting point 131 ° C, thickness 30μm)
And the obtained laminate is at or above the softening point of LLDPE.
Thus, Sample Example 5 was obtained.

[Comparative Example 1] (Pouch type) A chemical conversion treatment was applied to one surface of aluminum 20 μm, and a stretched polyester film (thickness 16
μm) by dry lamination, and then
When forming a heat seal layer on the surface of the chemical conversion treated aluminum (chemical conversion treatment layer), MDPE is extruded as a heat seal layer into a 30 μm-thick molten resin film to form a laminate. The sample was heated to a temperature equal to or higher than the softening point of MDPE to obtain Sample Comparative Example 1. [Comparative Example 2] (Pouch type) A chemical conversion treatment was performed on both surfaces of aluminum 20 μm, and a stretched polyester film (thickness 12 μm) was adhered to one surface of the chemical conversion treatment layer (1) by dry lamination. When a heat seal layer is formed on the other surface of the chemically treated aluminum and the chemical conversion layer (2), MDPE is extruded as an adhesive resin layer as a 30 μm thick molten resin film to form a heat seal layer. LLDP
After the E film (40 μm) was sandwich-laminated to form a laminate, the laminate was heated to a temperature equal to or higher than the softening point of MDPE to obtain Sample Comparative Example 2. [Comparative Example 3] (Pouch type) A chemical conversion treatment was performed on one surface of aluminum 20 μm, and a stretched polyester film (thickness 16
μm) by dry lamination, and then
When forming a heat seal layer on the surface of the chemical conversion-treated aluminum and the chemical conversion treatment layer, coextruding LLDPE to a thickness of 20 μm as an adhesive resin layer and LLDPE to a thickness of 30 μm as a heat seal resin to form a molten resin from a die. After extrusion lamination as a film to form a laminate, the laminate is
The sample was heated to a temperature equal to or higher than the softening point of MDPE to obtain Sample Comparative Example 3. [Comparative Example 4] (Embossed type) One side of aluminum 40 µm was subjected to a chemical conversion treatment, and a non-chemical conversion treated surface was subjected to a stretched nylon film (thickness 25 µm).
m) was adhered by a dry lamination method, and then the surface of the chemically treated aluminum surface (chemical conversion layer) was treated with M
After extruding and laminating DPE as a heat-sealing layer as a 30 μm-thick molten resin film to form a laminate, the laminate was heated to the softening point of MDPE or higher, and specimen comparative example 4
I got [Comparative Example 5] (Embossed type) A chemical conversion treatment was applied to one surface of aluminum 40 μm, a stretched nylon film 25 μm was adhered to a non-chemical conversion surface by a dry lamination method, and then MDPE was bonded to the chemical conversion treatment surface. The resin was extruded to a thickness of 20 μm, sandwich-laminated with an LLDPE film (thickness: 30 μm) to be a heat seal layer, and the obtained laminate was heated to a temperature equal to or higher than the softening point of MDPE. Obtained. [Comparative Example 6] (Embossed type) One side of 40 µm of aluminum was subjected to a chemical conversion treatment, and 25 µm of a surface-drawn nylon not subjected to the chemical conversion treatment was bonded by a dry lamination method. On the surface, a thickness of 20 μm using MDPE as an adhesive resin and 30 μm using LLDPE as a heat sealing resin.
The sample was extruded as a molten resin film from a co-extrusion die and laminated, and the obtained laminate was heated so as to have a softening point of MDPE or more to obtain Sample Comparative Example 6. Comparative Example 7 (Pouch Type) Sample Comparative Example 7 was obtained as a laminate under the same conditions as in Example 1 except that post-heating was not performed. Comparative Example 8 (Pouch Type) Specimen Comparative Example 8 was obtained as a laminate under the same conditions as in Example 2 except that post-heating was not performed. Comparative Example 9 (Pouch Type) Specimen Comparative Example 9 was obtained as a laminate under the same conditions as in Example 3 except that post-heating was not performed. Comparative Example 10 (Emboss Type) Sample Comparative Example 10 was obtained as a laminate under the same conditions as in Example 4 except that post-heating was not performed. Comparative Example 11 (Emboss Type) Sample Comparative Example 11 was obtained as a laminate under the same conditions as in Example 5 except that post-heating was not performed. Comparative Example 12 (Emboss Type) Sample Comparative Example 12 was obtained as a laminate under the same conditions as in Example 6 except that post-heating was not performed. [Comparative Example 13] (Pouch type, without die set) A chemical conversion treatment was applied to one surface of aluminum 20 μm, and PET 16 μm was bonded to a non-chemical conversion surface by a dry lamination method. Chemical conversion layer), when forming a heat seal layer,
LLDPE was used as an adhesive resin layer as a molten resin film having a thickness of 15 μm and extruded while being subjected to ozone treatment on the aluminum laminate side. As a heat seal layer, an LLDPE film (density 0.91, MFR 5.0 g / 10 seconds, softening temperature 100 C.) to form a laminate by a sandwich lamination method, and then heating the laminate to a temperature equal to or higher than the softening point of LLDPE to obtain Sample Comparative Example 13. [Comparative Example 14] (Embossed type, without die set) When forming chemical treatment on both sides of aluminum 40 μm, dry-laminate ON 25 μm on one side of the chemical conversion treatment, and forming a heat seal layer on the other chemical conversion treatment surface And LL
DPE was used as an adhesive resin layer and extruded as a 15 μm-thick molten resin film on the aluminum laminate surface side with ozone treatment. An LLDPE film (density 0.91, MFR 5.0 g / 10 seconds, softening temperature 1) was used as a heat seal layer.
(00 ° C.) to form a laminate by a sandwich lamination method, and then heating the laminate to a temperature equal to or higher than the softening point of LLDPE to obtain Sample Comparative Example 14.

<Pouching, embossing, and packaging> Examples 1 to 3, Comparative Examples 1 to 3 and Comparative Examples 7 to 9 and Comparative Example 13 of each of the obtained specimens were made as pouches. Then, Examples 4, 5 and Comparative Examples 4 to 6, Comparative Examples 9 to 12 and Comparative Example 14 were press-molded, each of which was packaged with a lithium battery main body and evaluated as follows.
Note that the evaluation was performed for each of the above 100 conditions.

<Evaluation Method> 1) Resistance to Content The storage conditions were as follows: each sample was stored in a thermostat at 60 ° C. and 90% RH for 7 days, and then the presence or absence of delamination of PE laminated with aluminum was determined. confirmed. 2) Delamination during heat sealing: 190 ° C, 5 seconds, 98
After heat sealing under the condition of N / cm ² , and left at 90 ° C. for 24 hours, the presence or absence of delamination between aluminum and the base material layer was confirmed. 3) Suitability for punching It is determined whether or not punching is possible without burrs by using a die set type punching die (male type and female type clearance 10 μm, pushing amount 1 mm).

<Results> Examples 1 to 6 and Comparative Example 1
3. In Comparative Example 14, the ozone treatment (A) and (B) did not cause any delamination at the time of heat sealing in any of the pouch and the emboss type, and delamination caused by the content-resistant material was also observed. Did not. In Comparative Examples 1 to 3, there was no delamination in pouching, but all delaminations occurred in the content resistance. In Comparative Examples 4 to 6, delamination at the time of heat sealing occurred in 80 out of 100 pieces, and 100% delamination occurred in the content resistance. In Comparative Examples 7 to 9, under both ozone treatment (A) and (B) conditions, there was no delamination in the pouch formation, but all delaminations occurred in the content resistance. In Comparative Examples 10 to 12, in both the ozone treatment (A) condition and the (B) condition, no delamination between the base material and aluminum was observed during heat sealing, but the content resistance was 100% delamination. Awakened.
In Examples 1 to 5, the die set was successfully removed. However, in Comparative Examples 13 and 14, burrs were generated and there was unremoved residue.

[0051]

The chemical conversion treatment applied to both surfaces of aluminum in the lithium battery packaging material of the present invention prevents the occurrence of delamination between the substrate layer and aluminum during embossing and heat sealing. In addition, by preventing corrosion of the aluminum surface due to hydrogen fluoride generated by the reaction between the electrolyte of the lithium battery and moisture, a remarkable effect of preventing delamination between aluminum and the layer on the content side can also be prevented. Is shown. When the heat seal layer of the lithium battery packaging material is formed by using an extrusion lamination method, a sandwich lamination method, or a co-extrusion lamination method, the lamination surface of the molten film of the resin laminated on the chemical conversion treatment surface is treated with ozone. Laminating while taking, by taking a means to heat the resulting laminate above the softening point of the resin,
Even if the adhesive resin and the resin forming the heat seal layer are polyethylene-based, they can be used as packaging materials for lithium batteries, and are more processable and economical than resins such as acid-modified polyolefins and metal cross-linked polyethylene. It is advantageous from the aspect. Further, in the case of performing a die-set type punching step, by setting the density and the MFR of the polyethylene resin used for the heat seal layer, it was possible to perform an operation without punching failure.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a structure of a laminate in a packaging material for a lithium battery according to the present invention. FIG. 1 (a) is a diagram illustrating a case where a laminate is formed by an extrusion lamination method, and FIG. (C)
Are examples in which a laminate was formed by a co-extrusion lamination method, wherein (d) is Y ₁ part, (e) is Y ₂ part,
(F) are each enlarged views of Y ₃ parts.

FIG. 2 is a perspective view illustrating a pouch type exterior body of a lithium battery.

FIG. 3 is a perspective view illustrating an embossed type exterior body of a lithium battery.

FIG. 4 illustrates molding in an emboss type.
(A) a perspective view, (b) an embossed exterior body body,
(C) X ₂ -X ₂ parts cross section is (d) Y ₄ parts enlarged view.

FIG. 5 is a conceptual diagram illustrating a sandwich lamination method for producing a packaging material for a lithium battery.

FIG. 6 is a conceptual diagram illustrating a co-extrusion method for producing a packaging material for a lithium battery.

FIG. 7 is a perspective view for explaining a method of mounting an adhesive film in bonding a packaging material for a lithium battery and a tab.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Lithium battery 2 Lithium battery main body 3 Cell (power storage part) 4 Tab (electrode) 5 Outer body 6 Adhesive film (tab part) 7 Concave part 8 Side wall part 9 Seal part 10 Laminate (packaging material for lithium battery) 11 Base material Layer 12 Aluminum (barrier layer) 13 Adhesive resin layer 14 Heat-sealing film layer (polyethylene film) 15 Chemical conversion layer 16 Adhesive layer 17 Ozone-treated surface 20 Press forming section 21 Male type 22 Female type 23 Cavity 30 Sandwich laminating device 31 Extrusion Machine 32 die 33 molten resin film 34 chill roll 35 pressure roll 36 heat seal layer film 37 laminate 40 coextrusion laminator 41 extruder 42 die 43 molten resin film 44 chill roll 45 pressure roll 46 laminate 50 ozone treatment device 51 ozone spraying unit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuki Yamada 1-1-1, Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd. (72) Inventor Hiroshi Miyama 1-chome, Ichigaya-ka, Shinjuku-ku, Tokyo No. 1 Dai Nippon Printing Co., Ltd. F term (reference) 3E086 BA04 BA13 BA15 BB02 BB51 CA33 DA08 5H011 AA09 AA10 CC10 DD13 EE04 GG09 HH13 JJ02 JJ07 KK06 5H029 AJ11 AJ14 AM02 BJ04 BJ12 CJ11 DJ02 DJ03 HJ08

Claims (26)

[Claims] 1. A packaging material for a lithium battery, comprising at least a substrate layer, an adhesive layer, aluminum, a chemical conversion layer, and a heat seal layer, wherein the heat seal layer is a polyethylene resin. 2. A heat seal layer having a density of 0.935 or more,
The packaging material for a lithium battery according to claim 1, wherein the packaging material is a polyethylene resin layer containing at least one medium-density polyethylene having a FR of 1 to 15 g / 10 seconds. 3. The lithium battery packaging material according to claim 1, wherein the chemical conversion treatment is a phosphoric acid chromate treatment. 4. A method for forming a packaging material for a lithium battery comprising a base material layer, an adhesive layer, aluminum, a chemical conversion treatment layer, and a heat sealing layer, wherein one side of aluminum is subjected to a chemical conversion treatment.
After dry laminating the substrate and the surface not subjected to the chemical conversion treatment, when forming a resin for forming a heat seal layer on the surface subjected to the chemical conversion treatment by an extrusion method to form a laminate, the extruded resin A method for producing a packaging material for a lithium battery, wherein the lamination surface of a molten film is laminated while being subjected to ozone treatment. 5. A method according to claim 1, wherein at least a substrate layer, an adhesive layer, aluminum, a chemical conversion layer, an adhesive resin layer, and a heat seal layer are formed, and the adhesive resin layer and the heat seal layer are made of a polyethylene resin. Packaging materials for lithium batteries. 6. A heat seal layer having a density of 0.92 or more,
The packaging material for a lithium battery according to claim 5, which is a polyethylene resin layer containing at least one medium-density polyethylene having an FR of 1 to 15 g / 10 seconds. 7. The packaging material for a lithium battery according to claim 5, wherein the chemical conversion treatment is a phosphoric acid chromate treatment. 8. In forming a packaging material for a lithium battery comprising a base material layer, an adhesive layer, aluminum, a chemical conversion treatment layer, an adhesive resin layer, and a heat sealing layer, one side of aluminum is subjected to a chemical conversion treatment to form a base material and the chemical conversion treatment. After dry laminating the surface not subjected to the treatment, the adhesive resin layer and the heat seal layer are coextruded on the surface subjected to the chemical conversion treatment, and the laminating surface on the aluminum side of the adhesive resin layer formed into a molten film is treated with ozone. A method for producing a packaging material for a lithium battery, comprising: 9. In forming a packaging material for a lithium battery comprising a base material layer, an adhesive layer, aluminum, a chemical conversion treatment layer, an adhesive resin layer, and a heat sealing layer, one side of aluminum is subjected to a chemical conversion treatment to form a base material and the chemical conversion treatment. After dry laminating the surface not subjected to the treatment, the adhesive resin layer is extruded on the surface subjected to the chemical conversion treatment, and when the film to be the heat seal layer is sandwich-laminated, the aluminum surface side of the molten film of the adhesive resin layer A method for producing a packaging material for a lithium battery, comprising laminating a laminate surface while performing ozone treatment. 10. The method for producing a packaging material for a lithium battery according to claim 6, wherein medium density polyethylene is used as the adhesive resin layer. 11. The method for producing a packaging material for a lithium battery according to claim 8, wherein a linear low-density polyethylene is used as the adhesive resin layer. 12. The method according to claim 4, wherein the obtained laminate is heated by post-heating to a condition at which the temperature is higher than the softening point of the adhesive resin. A method for producing a packaging material for a lithium battery. 13. The laminate according to claim 4, wherein the surface of the aluminum facing the molten film is laminated by heating it to a condition at which the surface is higher than the softening point of each molten film.
A method for producing the packaging material for a lithium battery according to claim 11. 14. A packaging material for a lithium battery, comprising at least a base material layer, an adhesive layer, a chemical conversion treatment layer 1, aluminum, a chemical conversion treatment layer 2, and a heat seal layer, wherein the heat seal layer is a polyethylene resin. . 15. A heat seal layer having a density of 0.935 or more,
The packaging material for a lithium battery according to claim 14, which is a medium density polyethylene having an MFR of 1 to 15 g / 10 seconds. 16. The packaging material for a lithium battery according to claim 14, wherein the chemical conversion treatment is a phosphoric acid chromate treatment. 17. In the formation of a packaging material for a lithium battery comprising a base material layer, an adhesive layer, a chemical conversion treatment layer 1, aluminum, a chemical conversion treatment layer 2, and a heat seal layer, both surfaces of aluminum are subjected to a chemical conversion treatment. After dry laminating one surface subjected to the chemical conversion treatment and then forming a heat-sealing layer-forming resin on the other surface subjected to the chemical conversion treatment by an extrusion method to form a laminate, the extruded resin A method for producing a packaging material for a lithium battery, comprising laminating while laminating a laminated surface of a molten film as described above with ozone. 18. At least a substrate layer, an adhesive layer, a chemical conversion layer 1, aluminum, a chemical conversion layer 2, an adhesive resin layer, and a heat seal layer, wherein the adhesive resin layer and the heat seal layer are polyethylene resins. A packaging material for a lithium battery. 19. The heat-sealing layer has a density of 0.92 or more,
19. The packaging material for a lithium battery according to claim 18, which is a polyethylene resin layer containing at least one layer of medium-density polyethylene having a MFR of 1 to 15 g / 10 seconds. 20. The packaging material for a lithium battery according to claim 18, wherein the chemical conversion treatment is a phosphoric acid chromate treatment. 21. A base material layer, an adhesive layer, a chemical conversion treatment layer 1, aluminum, a chemical conversion treatment layer 2, an adhesive resin layer, and a heat seal layer.
-15 g / 10 sec medium density polyethylene at least 1
In the formation of the lithium battery packaging material, which is a polyethylene resin layer including a layer, a chemical conversion treatment was performed on both surfaces of aluminum, and the base material and one surface subjected to the chemical conversion treatment were dry-laminated, and then subjected to the chemical conversion treatment. Manufacturing of a packaging material for a lithium battery, characterized in that an adhesive resin layer and a heat seal layer are co-extruded on the other surface, and a laminated surface on the aluminum side of the adhesive resin layer formed as a molten film is laminated while being subjected to ozone treatment. Method. 22. A base material layer, an adhesive layer, a chemical conversion treatment layer 1 made of aluminum, a chemical conversion treatment layer 2, an adhesive resin layer, and a heat seal layer.
In forming a lithium battery packaging material which is a polyethylene resin layer containing at least one layer of medium-density polyethylene of 15 g / 10 seconds, both surfaces of aluminum are subjected to a chemical conversion treatment, and a base material and one of the surfaces subjected to the chemical conversion treatment are treated. After the dry lamination, the adhesive resin layer is extruded on the other surface subjected to the chemical conversion treatment, and when the film to be the heat seal layer is sandwich-laminated, the laminated surface on the aluminum side of the molten film of the adhesive resin is ozone treated. A method for producing a packaging material for a lithium battery, comprising: 23. The method for producing a packaging material for a lithium battery according to claim 21, wherein a medium density polyethylene is used as the adhesive resin layer. 24. The method according to claim 21, wherein a linear low-density polyethylene is used as the adhesive resin layer.
3. The method for producing a packaging material for a lithium battery according to 2. 25. The lithium battery package according to claim 21, wherein the obtained laminate is heated by post-heating to a condition at which the temperature is higher than the softening point of the adhesive resin. Material manufacturing method. 26. The lithium according to claim 21, wherein the surface of the aluminum facing the molten film is laminated by heating it to a temperature higher than the softening point of each molten film. Manufacturing method of battery packaging material.