JP5187370B2 - Polymer battery packaging materials - Google Patents

Description

  The present invention relates to a polymer battery packaging material having a solid electrolyte having moisture resistance and content resistance, and a method for producing the same.

  The polymer battery is also referred to as a lithium secondary battery, and is a battery that has a polymer electrolyte and generates a current by the movement of lithium ions, and includes a positive electrode / negative electrode active material made of a polymer. The configuration of the lithium secondary battery is as follows: positive electrode current collector (aluminum, nickel) / positive electrode active material layer (polymer positive electrode material such as metal oxide, carbon black, metal sulfide, electrolyte, polyacrylonitrile) / electrolyte layer ( Carbonate electrolytes such as propylene carbonate, ethylene carbonate, dimethyl carbonate, ethylene methyl carbonate, inorganic solid electrolytes made of lithium salts, gel electrolytes) / negative electrode active material layers (lithium metals, alloys, carbon, electrolytes, polyacrylonitrile, etc. Polymer negative electrode material) / negative electrode current collector (copper, nickel, stainless steel) and an outer package for packaging them. Polymer batteries are used for personal computers, portable terminal devices (cell phones, PDAs, etc.), video cameras, electric vehicles, energy storage batteries, robots, satellites, and the like. As the outer casing of the polymer battery, a metal can formed by pressing a metal into a cylindrical or rectangular parallelepiped container, or a bag made of a multilayer film composed of an outermost layer / aluminum / sealant layer is used. It was done.

However, there have been the following problems as the outer package of the polymer battery. In a metal can, since the outer wall of the container is rigid, the shape of the battery itself is determined. Therefore, since the hardware side is designed according to the battery, the size of the hardware using the battery is determined by the battery, and the degree of freedom in shape is reduced. In addition, a bag-like outer package made of a multilayer film is required as a polymer battery outer package, although there is no restriction on the degree of freedom in the hardware shape design using the battery, such as the metal can. At present, packaging materials that can sufficiently satisfy the physical properties and functions have not been developed yet. The physical properties / functions include moisture resistance, content resistance, moldability, and the like. For example, it is a structure of a base material layer, a barrier layer, and an innermost resin layer. In the case of a polymer battery, in particular, an adhesive strength between each layer is required. In particular, the adhesion between the barrier layer and the innermost resin layer is affected by hydrogen fluoride produced by the reaction between lithium, fluorine compounds, etc., which are constituent elements of the polymer battery, and the outside air (especially moisture = moisture). It is easy and requires no delamination over a long period of time. Therefore, dry lamination, thermal lamination, or the like is used for laminating the barrier layer and the innermost resin layer. However, in these methods, a laminating speed is low, and a method with higher productivity has been demanded. Further, when the innermost layer side is laminated by a method in which the adhesive resin and the innermost resin are co-extruded, the productivity is good, but the adhesive strength with aluminum is low and practical application is difficult. As a method of increasing the adhesive strength, the present inventors coated an acid-modified PP emulsion on an aluminum surface and baked to form a film, and the acid-modified PP resin and the innermost resin were extruded by coextrusion on the film surface. Although it has been confirmed that the required adhesive strength can be obtained by laminating, there is a problem that the processing efficiency is poor due to the coating of the acid-modified PP emulsion and its baking. An object of the present invention is to provide a polymer battery packaging material produced by a production method with good productivity as well as protective physical properties of a polymer battery body as a material used for polymer battery packaging .

The present invention comprises a laminate obtained by laminating at least a base material layer, an adhesive layer, a chemical conversion treatment layer, aluminum, a chemical conversion treatment layer, an adhesive resin layer, and an innermost resin layer in this order, and the adhesive resin layer is an acid-modified polypropylene. Either a resin, a low crystalline ethylene-butene copolymer having a density of 900 kg / m ³ or less, a low crystalline propylene-butene copolymer, or an amorphous ethylene-propylene copolymer A polymer resin packaging material , wherein the adhesive resin layer and the innermost resin layer are coextruded layers , or at least a base material layer, an adhesive layer, It consists of a laminate formed by laminating aluminum, a chemical conversion treatment layer, an adhesive resin layer, and an innermost resin layer in this order. The adhesive resin layer is an acid-modified polypropylene resin, and the innermost resin layer is There degrees is 900 kg / m ³ or less of the low-crystalline ethylene-butene copolymer, low crystalline propylene-butene copolymer, or a polypropylene resin obtained by addition of either ethylene-propylene copolymer of the amorphous The polymer resin packaging material is characterized in that the adhesive resin layer and the innermost resin layer are co-extruded layers, and the chemical conversion treatment includes a phosphoric acid chromate treatment .

  The chemical conversion treatment performed on both sides of aluminum in the polymer battery packaging material of the present invention can prevent delamination between the base material layer and aluminum during embossing and heat sealing, and In addition, since the corrosion of the aluminum surface due to hydrogen fluoride generated by the reaction between the electrolyte of the polymer battery and moisture can be prevented, it is possible to prevent the delamination between the aluminum and the content-side layer. In addition, since the innermost resin layer can be formed and laminated at the same time, the productivity is good, and the adhesive strength as a polymer battery packaging material can be obtained by post-heating treatment, and it can be used as an outer package of a polymer battery. Can do.

It is sectional drawing explaining the structure of the laminated body in the packaging material for polymer batteries of this invention. It is a perspective view explaining the pouch type exterior body of a polymer battery. It is a perspective view explaining the embossed type exterior body of a polymer battery. It is (a) perspective view, (b) embossed exterior body, (c) X ₂ -X ₂ part sectional view, (d) Y ₁ part enlarged view for explaining molding in the embossed type. Is a perspective view illustrating the mounting how the adhesive film in the adhesion between the packaging material and the tab polymer battery.

The present invention stabilizes the laminate strength of a laminate as a packaging material for a polymer battery and performs efficient production. Hereinafter, materials and a lamination method in a laminate configuration will be described with reference to the drawings. FIG. 1 is a cross-sectional view illustrating the structure of a laminate in a polymer battery packaging material of the present invention. FIG. 2 is a perspective view illustrating a pouch-type exterior body of the polymer battery. FIG. 3 is a perspective view illustrating an embossed type exterior body of the polymer battery. FIGS. 4A and 4B are explanatory views of molding in the embossed type. FIG. 4A is a perspective view, FIG. 4B is an embossed exterior body body, c) X ₂ -X ₂ part sectional view, and FIG. 4D is an enlarged view of Y ₁ part. . FIG. 5 is a perspective view for explaining a method for attaching an adhesive film in adhesion between a polymer battery packaging material and a tab . The polymer battery packaging material is a laminate comprising at least a base material layer, a barrier layer, and an innermost resin layer, and if necessary, between the base material layer and the barrier layer, and between the barrier layer and the innermost resin layer. An intermediate layer may be provided between the two.

  When the polymer battery packaging material is, for example, nylon / adhesive layer / aluminum / adhesive layer / cast polypropylene, and the adhesive layer is formed by a dry laminating method, when the polymer battery outer package is an embossed type, press molding In this case, delamination often occurs between the aluminum and the base material layer in the side wall, and delamination occurs also in the portion where the polymer battery body is housed in the exterior body and the periphery is heat sealed. was there. Moreover, the surface of the inner surface of aluminum may be attacked by hydrogen fluoride generated by the reaction between the electrolyte, which is a component of the battery, and moisture, and delamination may occur.

  Therefore, the present inventors have intensively studied a packaging material that is a laminated body that does not cause delamination during emboss molding and heat sealing, and that can be satisfied as an exterior body for a polymer battery having content resistance. As a result, both sides of the aluminum were subjected to chemical conversion treatment, and the chemical conversion treatment surface on the aluminum content side was subjected to acid-modified PP (hereinafter sometimes referred to as PPa) such as unsaturated carboxylic acid grafted random propylene and polypropylene. And by co-extrusion, the obtained laminate was post-heated to find that the above problems could be solved and the present invention was completed.

  As shown in FIG. 1, the layer structure of the polymer battery packaging material of the present invention includes at least a base layer 11, an adhesive layer 16, a chemical conversion treatment layer 15 (1), aluminum 12, a chemical conversion treatment layer 15 (2), and extrusion. A laminate comprising a resin layer 13 and an innermost layer 14, wherein the extruded resin layer 13 and the innermost layer 14 are formed by coextrusion.

  In the present invention, as shown in FIG. 1, a chemical conversion treatment layer 15 is provided on both surfaces of a barrier layer 12, and an adhesive resin 13 and an innermost resin 14 are extruded and laminated on the inner surface side of the barrier layer 12 by a coextrusion method. Further, the formed laminate is heated to a temperature higher than the softening point of the adhesive resin by post-heating.

  The polymer battery packaging material is an outer package for wrapping the polymer battery main body, and there are a pouch type as shown in FIG. 2 and an embossed type as shown in FIG. 3 depending on the type of the outer package. Examples of the pouch type include three-side seals, four-side seals, and pillow types such as a pillow type. FIG. 2 illustrates a pillow type. Further, as the embossed type, as shown in FIG. 3 (a), a concave portion may be formed on one side, or as shown in FIG. 3 (b), a concave portion is formed on both sides to form a polymer battery body. It may be housed and sealed by heat-sealing the four sides of the periphery. In addition, there is also a type in which concave portions are formed on both sides across a folding portion as shown in FIG. 3 (c), a polymer battery is accommodated, and three sides are heat sealed.

  The outermost layer 11 in the present invention is composed of stretched polyester or nylon film. At this time, examples of the polyester resin include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, copolymer polyester, polycarbonate, and the like. It is done. Examples of the nylon resin include polyamide resins, that is, nylon 6, nylon 6,6, a copolymer of nylon 6 and nylon 6,6, nylon 6,10, polymetaxylylene adipamide (MXD6), and the like. It is done.

  When the outermost layer 11 is used as a polymer battery, the outermost layer 11 is a portion that is in direct contact with the hardware, so that a resin layer having an insulating property is basically preferable. Considering the existence of pinholes in the film alone and the occurrence of pinholes during processing, the outermost layer 11 needs to have a thickness of 6 μm or more, and a preferable thickness is 12 to 25 μm.

In the present invention, the outermost layer 11 can be laminated in order to improve pinhole resistance and insulation when used as a battery outer package. When the outermost layer 11 is laminated, the outermost layer 11 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 25 μm. Examples of laminating the outermost layer include the following 1) to 7) although not shown.
1) Stretched polyethylene terephthalate / stretched nylon 2) Stretched nylon / stretched polyethylene terephthalate Mechanical suitability of packaging materials (stability of conveyance in packaging machines and processing machines), surface protection (heat resistance, electrolyte resistance) When the exterior body for polymer battery is made an embossed type as a secondary processing, the outermost layer is multilayered for the purpose of reducing the frictional resistance between the mold and the outermost layer during embossing, and the fluororesin layer on the outermost layer surface It is preferable to provide an acrylic resin layer, a silicone resin layer, or the like. For example,
3) Fluorine-based resin layer / stretched polyethylene terephthalate (Fluorine-based resin is a film or formed by drying after liquid coating)
4) Silicone resin / stretched polyethylene terephthalate. The silicone-based resin is formed by drying after film-like material or liquid coating.
5) Fluorine-based resin / stretched polyethylene terephthalate / stretched nylon 6) Silicone resin / stretched polyethylene terephthalate / stretched polyethylene terephthalate / stretched nylon 7) Acrylic resin, / stretched nylon Curing)

  The outermost layer is bonded to the barrier layer by a dry lamination method, an extrusion lamination method, or the like.

  The barrier layer 12 is a layer for preventing water vapor from entering the inside of the polymer battery from the outside, stabilizing the pinhole and processability (pouching, embossing) of the barrier layer alone, In order to provide pinhole properties, a metal such as aluminum or nickel having a thickness of 15 μm or more, or a film on which an inorganic compound such as silicon oxide or alumina is vapor-deposited may be mentioned. The barrier layer is preferably 15 to 80 μm. Of aluminum. In order to further improve so as to reduce the occurrence of pinholes, and to make the polymer battery exterior body type an embossed type, in order to prevent the occurrence of cracks and the like in the embossed part, the present inventors The aluminum material used has an iron content of 0.3 to 9.0% by weight, preferably 0.7 to 2.0% by weight. The present inventors have found that the spreadability is good, the occurrence of pinholes by bending as a laminated body is reduced, and the side wall can be easily formed when embossing the embossed type exterior body. When the iron content is less than 0.3% by weight, the effect of preventing the generation of pinholes and improving the embossing formability is not recognized, and the iron content of the aluminum exceeds 9.0% by weight. In this case, the flexibility as aluminum is hindered, and the bag-making property is deteriorated as a laminate.

  In addition, aluminum produced by cold rolling changes its flexibility, waist strength, and hardness under annealing (so-called annealing treatment) conditions, but the aluminum used in this example is not annealed. A soft processed product having flexibility, which is appropriately annealed, is preferable to the product. The degree of flexibility, waist strength and hardness, that is, annealing conditions may be appropriately selected in accordance with processing suitability (pouching, embossing suitability). For example, in order to prevent pinholes and wrinkles during embossing, aluminum that tends to be softer and more or less annealed than a hard-treated product that has not been annealed is better.

  Furthermore, the inventors of the present invention have disclosed that the surface of the polymer battery body side surface of aluminum is dissolved and corroded by hydrogen fluoride (chemical formula: HF), which is generated by the reaction between the electrolyte and moisture of the polymer battery. For the problem of preventing dissolution and corrosion and improving the adhesion (wetting) of both surfaces of aluminum, and stabilizing the adhesion between aluminum and the innermost resin layer when forming a laminate, It has been found that the formation of an acid-resistant film on the front and back surfaces of aluminum and the treatment for improving the adhesive force have a remarkable effect in solving the above problems.

  The inner surface side from the barrier layer 12 in the polymer battery packaging material of the present invention is formed by a coextrusion method, and the adhesive resin 13 and the innermost resin 14 are formed by coextrusion on the aluminum chemical conversion treatment surface. Glued. Then, it is desirable to use cast polypropylene (hereinafter referred to as CPP) having heat sealability between the innermost resin layers 14 and having necessary physical properties such as heat resistance, moisture resistance and press formability. Then, acid-modified PP and CPP having good adhesion to the chemical conversion treatment surface of aluminum are coextruded to form a laminate with the acid-modified PP layer facing the aluminum.

  In addition to the base material layer, barrier layer, and innermost resin layer (CPP), an intermediate layer may be provided between the barrier layer and the innermost resin layer as the laminate of the polymer battery packaging material of the present invention. Good. The intermediate layer may be laminated for the purpose of improving the strength as a packaging material for polymer batteries, improving and stabilizing the barrier property, or the like.

As shown in FIG. 1, the inventors of the present invention, as a result of diligent research, as shown in FIG. 1, a chemical conversion treatment 15 (1) By applying 15 (2), it was possible to obtain a laminate that was satisfactory as the packaging material. The chemical conversion treatment 15 is specifically delamination between aluminum and the base material layer during embossing by forming an acid-resistant film such as phosphate, chromate, fluoride, triazine thiol compound, etc. And hydrogen fluoride generated by the reaction between the electrolyte and moisture of the polymer battery prevents the aluminum surface from being dissolved and corroded, especially the aluminum oxide present on the aluminum surface from being dissolved and corroded, and the aluminum surface. This improves the adhesion (wetting property) and prevents delamination between the base material layer and aluminum at the time of heat sealing. In the embossed type, it shows the effect of preventing delamination between the base material layer and aluminum at the time of press molding. As a result of conducting chemical conversion treatment on the aluminum surface using various substances and studying the effect, it is composed of three components of phenolic resin, chromium fluoride (3) compound and phosphoric acid among the acid-resistant film-forming substances. The resulting aqueous solution was applied to the aluminum surface, and the dry baking process was good. The coating amount is about 10 mg / m ² as a dry weight.

  In the case where the outer package of the polymer battery is a pouch type, the chemical conversion treatment may be performed only on one side of the innermost layer side of aluminum. In the case where the exterior body of the polymer 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 the aluminum. A laminate obtained by chemical conversion treatment on both surfaces of aluminum may be used for the pouch type.

  In the production of the polymer battery packaging material of the present invention, after chemical conversion treatment is performed on both surfaces of aluminum as the barrier layer, the base material is bonded to one surface subjected to the chemical conversion treatment by a dry laminating method. A laminated body is obtained by extruding an adhesive resin and an innermost resin by coextrusion on another surface subjected to the above.

  When acid-modified PP and CPP are co-extruded on the chemical conversion treatment surface of aluminum, the productivity as a laminate process is excellent, but the adhesive strength does not provide the strength required when used as a packaging material for polymer batteries. . As a result of intensive studies on the method for improving the adhesive strength, the present inventors can increase the adhesive strength between the chemical conversion treatment layer and the adhesive resin layer by heating the obtained laminate. As the heating method, there are methods such as a hot roll contact method, a hot air method, a near or far infrared ray, and any method may be used as long as it can be heated to the softening point temperature or more of the adhesive resin.

  CPP is suitably used for the innermost layer of the laminate in the polymer battery packaging material of the present invention. CPP is used for the innermost layer because it has good heat-sealability between CPPs, and has the required protective properties as the innermost layer of polymer battery packaging materials, such as moisture resistance and heat resistance, and is also laminated. It is a desirable material due to its good properties and good embossing formability. Examples of the CPP include (1) a homotype having a melting point of 150 ° C. or higher, (2) a copolymer of ethylene-propylene having a melting point of 130 ° C. or higher (random copolymer type), and (3) an ethylene tube having a melting point of 110 ° C. or higher. A single-layer or multi-layer product of a ten-propylene copolymer (terpolymer) or a blend thereof is used.

In addition, the CPP contains a low crystalline ethylene-butene copolymer having a density of 900 kg / m ³ or less, a low crystalline propylene-butene copolymer, or an amorphous ethylene-propylene copolymer. % Or more may be added to impart flexibility to improve bending resistance and prevent cracking during molding.

However, since CPP has no heat sealability with respect to metal, when the tab portion of the polymer battery is heat-sealed, as shown in FIGS. 5 (a), 5 (b), and 5 (c), the tab and By interposing an adhesive film having heat sealability to both the metal and the CPP between the innermost layer of the laminate, the sealing performance at the tab portion is also ensured. The adhesive film may be wound around a predetermined position of the tab as shown in FIGS. 5 (d), 5 (e), and 5 (f). As the adhesive film, the unsaturated carboxylic graft polyolefin, metal cross-linked polyethylene, a film made of a copolymer of ethylene or propylene and acrylic acid or methacrylic acid can be used.

  In the present invention, when the substrate and the barrier layer are bonded together by the dry lamination method, polyester-based, polyethyleneimine-based, polyether-based, cyanoacrylate-based, urethane-based, organic titanium-based, polyether-urethane-based, epoxy Various adhesives such as polyester, polyester urethane, imide, isocyanate, polyolefin, and silicone can be used.

The polymer battery packaging material of the present invention will be described more specifically with reference to examples. In each of the chemical conversion treatments, an aqueous solution composed of a phenol resin, a chromium fluoride (3) compound, and phosphoric acid was applied as a treatment liquid by a roll coating method, and baked under a condition that the film temperature was 180 ° C. or higher. The application amount of chromium is 10 mg / m ² (dry weight). Example 1, Comparative Example 1 and Comparative Example 3 are pouch-type exterior bodies, all of which make a pillow-type pouch with a width of 50 mm and a length of 80 mm, accommodate the polymer battery body, and seal hermetically did. Further, Example 2, Comparative Example 2 and Comparative Example 4 are embossed type exterior bodies, the embossing is a single-sided embossed type, and the shape of the concave portion (cavity) of the mold is 30 mm × 50 mm and the depth is 3.5 mm. The moldability was evaluated by press molding. In each example, a film made of unsaturated carboxylic acid grafted random propylene having a thickness of 20 μm was wound around the seal portion of the tab of the polymer battery as an adhesive film and heat-sealed.

(Pouch type)
Both sides of aluminum 20 μm are subjected to chemical conversion treatment, and a stretched polyester film is bonded to one side of the chemical conversion treatment by a dry laminating method. Next, acid-modified PP 20 μm having a softening point of 120 ° C. is applied to the other surface of the chemical conversion treatment aluminum. And PP resin 30 μm were co-extruded to laminate the acid-modified PP side to be an aluminum surface, and the obtained laminate was heated so that the surface temperature of aluminum was 150 ° C. Obtained.

(Embossed type)
Chemical conversion treatment was applied to both surfaces of 40 μm aluminum, and 25 μm of nylon was bonded to one surface of the chemical conversion treatment by a dry laminating method. Next, acid-modified PP 20 μm having a softening point of 120 ° C. and PP resin was bonded to the other surface subjected to chemical conversion 30 μm was laminated by coextrusion so that the acid-modified PP side was an aluminum surface, and the obtained laminate was heated so that the surface temperature of aluminum was 150 ° C. to obtain Sample Example 2.

[Comparative Example 1] (Pouch type)
Both sides of aluminum 20 μm are subjected to chemical conversion treatment, and a stretched polyester film is bonded to one side of the chemical conversion treatment by a dry laminating method. Next, acid-modified PP 20 μm having a softening point of 120 ° C. is applied to the other surface of the chemical conversion treatment aluminum. And PP resin 30 μm were laminated by coextrusion so that the acid-modified PP side was an aluminum surface, and the laminate was designated as Sample Comparative Example 1.

[Comparative Example 2] (Embossed type)
Chemical conversion treatment was applied to both surfaces of 40 μm aluminum, and 25 μm of nylon was bonded to one surface of the chemical conversion treatment by a dry laminating method. Next, acid-modified PP 20 μm having a softening point of 120 ° C. and PP resin was bonded to the other surface subjected to chemical conversion A laminate obtained by laminating 30 μm by co-extrusion so that the acid-modified PP side was an aluminum surface was designated as Sample Comparative Example 2.

[Comparative Example 3] (Pouch type)
A stretched polyester film is bonded to one surface of aluminum 20 μm by a dry laminating method, and then the acid-modified PP 20 μm having a softening point of 120 ° C. and PP resin 30 μm are coextruded on the other surface of the aluminum to the acid. Lamination was performed so that the modified PP side was an aluminum surface, and the obtained laminate was heated so that the surface temperature of aluminum was 150 ° C., thereby obtaining Sample Comparative Example 3.

[Comparative Example 4] (Embossed type)
25 μm of nylon is bonded to one surface of 40 μm of aluminum by a dry laminating method, and then the acid-modified PP side of the surface of aluminum is coextruded with 20 μm of acid-modified PP having a softening point of 120 ° C. and 30 μm of PP resin. The laminate was laminated so as to have an aluminum surface, and the obtained laminate was heated so that the surface temperature of aluminum was 150 ° C., thereby obtaining Sample Comparative Example 4.

<Embossing and packaging>
Example 1, Comparative Example 1 and Comparative Example 3 of the obtained specimens were made as pouches, Example 2, Comparative Example 2 and Comparative Example 4 were press-molded, respectively, and the polymer battery body was packaged, and the following Evaluation was performed.

<Evaluation method>
1) The presence or absence of delamination between aluminum and the base material layer was confirmed immediately after delamination molding during molding.
2) As storage conditions for content resistance, each specimen was stored in a thermostat at 60 ° C. and 90% RH for 7 days, and then the presence or absence of delamination between aluminum and cast polypropylene was confirmed.
3) Delamination during heat sealing Immediately after heat sealing, the presence or absence of delamination between aluminum and the innermost resin layer was confirmed.

<Result>
In both Example 1 and Example 2, there was no delamination at the time of emboss molding and heat sealing, and no delamination due to the content resistant material was observed. In both Comparative Examples 1 and 2, no delamination was observed during heat sealing. There was no delamination during embossing in Comparative Example 2. However, in both Comparative Example 1 and Comparative Example 2, delamination on the contents side was observed in all 100 samples. However, the delamination on the content side was not due to corrosion of the aluminum surface, but was interface peeling between the chemical conversion treatment surface and the acid-modified PP layer. In both Comparative Example 3 and Comparative Example 4, delamination was observed in 40 and 46 samples in 100 samples at the time of heat sealing. In Comparative Example 4, delamination was observed in 22 samples in 100 samples at the time of embossing. . Further, delamination due to the content resistance was observed in all of 100 samples. The delamination on the contents side was caused by corrosion of the aluminum surface.

1 Polymer Battery 2 Polymer Battery Body 3 Cell (Power Storage Unit)
4 Tab (electrode)
5 Exterior body 6 Adhesive film (tab part)
7 Concave portion 8 Side wall portion 9 Seal portion 10 Laminated body (polymer battery packaging material)
11 Base material layer 12 Aluminum (barrier layer)
DESCRIPTION OF SYMBOLS 13 Extrusion resin layer 14 Innermost resin layer 15 Chemical conversion treatment layer 16 Adhesion layer 20 Press molding part 21 Male type 22 Female type 23 Cavity

Claims (3)

At least a base material layer, an adhesive layer, a chemical conversion treatment layer, aluminum, a chemical conversion treatment layer, an adhesive resin layer, and an innermost resin layer are laminated in this order. The adhesive resin layer is an acid-modified polypropylene resin, Either a low crystalline ethylene-butene copolymer having a density of 900 kg / m ³ or less, a low crystalline propylene-butene copolymer, or an amorphous ethylene-propylene copolymer was added to the inner resin layer . A polymer battery packaging material , which is a polypropylene resin, wherein the adhesive resin layer and the innermost resin layer are coextruded. At least a base material layer, an adhesive layer, aluminum, a chemical conversion treatment layer, an adhesive resin layer, and an innermost resin layer are laminated in this order. The adhesive resin layer is an acid-modified polypropylene resin, and the innermost resin layer is an innermost resin layer. A polypropylene resin to which either a low crystalline ethylene-butene copolymer having a density of 900 kg / m ³ or less, a low crystalline propylene-butene copolymer, or an amorphous ethylene-propylene copolymer is added. A polymer battery packaging material, wherein the adhesive resin layer and the innermost resin layer are co-extruded layers . 3. The polymer battery packaging material according to claim 1, wherein the chemical conversion treatment is a phosphoric acid chromate treatment .

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