JP4620203B2 - Method for producing polymer battery packaging material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
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.
[0002]
[Prior art]
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.
The polymer battery is 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 exterior body of the polymer battery, a metal can obtained 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.
[0003]
[Problems to be solved by the invention]
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.
The objective of this invention is providing the manufacturing method with good productivity with the protective physical property of a polymer battery main body as a material used for a polymer battery packaging.
[0004]
[Problems to be solved by the invention]
  The present inventionManufacturing methodIsMade by subjecting both sides of aluminum to chemical conversion treatment, dry laminating the base material and one side of the aluminum that has undergone chemical conversion treatment, and then co-extruding the adhesive resin and innermost resin to the other surface subjected to the chemical conversion treatment This is a manufacturing method in which a film is formed into a laminated body, and the obtained laminated body is heated by post-heating under the condition that the adhesive resin is equal to or higher than its softening point. In addition, the manufacturing method of the present invention includes a chemical conversion treatment on one side of aluminum, dry lamination of a base material and a surface not subjected to the chemical conversion treatment of aluminum, and then an adhesive resin and an innermost layer on the surface subjected to the chemical conversion treatment. The resin is coextruded to form a laminated body, and the obtained laminated body can be heated by post-heating under the condition that the adhesive resin is at or above its softening point..
[0005]
DETAILED DESCRIPTION OF THE INVENTION
  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. 4A and 4B illustrate molding in an embossed type, (a) perspective view, (b) embossed exterior body, c) X₂-X₂It is a fragmentary sectional view, (d) Y1 part enlarged view. FIG.It is a perspective view explaining the mounting method of the adhesive film in adhesion | attachment with the packaging material for polymer batteries, 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.
[0006]
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.
[0007]
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.
[0008]
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.
[0009]
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.
[0010]
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.
[0011]
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.
[0012]
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.
[0013]
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
In addition, the mechanical suitability of packaging materials (stability of conveyance in packaging machines and processing machines), surface protection (heat resistance, electrolyte resistance), and the exterior body for polymer batteries are embossed as secondary processing. In order to reduce the frictional resistance between the mold and the outermost layer during embossing, it is preferable to multilayer the outermost layer and to provide a fluororesin layer, an acrylic resin layer, a silicone resin layer, etc. on the outermost layer surface. . 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 resin / stretched polyethylene terephthalate / stretched nylon
6) Silicone resin / stretched polyethylene terephthalate / stretched polyethylene terephthalate / stretched nylon
7) Acrylic resin, stretched nylon (Acrylic resin is a film-like material, or liquid coating, and curing by drying)
[0014]
The outermost layer is bonded to the barrier layer by a dry lamination method, an extrusion lamination method, or the like.
[0015]
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.
[0016]
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.
[0017]
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.
[0018]
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.
[0019]
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.
[0020]
As shown in FIG. 1, the inventors of the present invention, as a result of earnest research, as shown in FIG. 1, conversion treatment 15 (1) on the front and back surfaces of the aluminum that is the barrier layer 12 of the packaging material for polymer batteries, 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 10 mg / m as dry weight.²Degree.
[0021]
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.
[0022]
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.
[0023]
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.
[0024]
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.
[0025]
The CPP has a density of 900 kg / m.^Three5% or more of the following low crystalline ethylene-butene copolymer, low crystalline propylene-butene copolymer, amorphous ethylene-propylene copolymer, amorphous propylene-ethylene copolymer, etc. It is also possible to add flexibility to improve bending resistance and prevent cracking during molding.
[0026]
  However, since CPP does not have heat-sealability for metal, when heat-sealing the tab portion in a polymer battery,FIG.(A),FIG.(B),FIG.(C) As shown in (c), the sealing property at the tab portion is ensured by interposing an adhesive film having heat sealability to both the metal and the CPP between the tab and the innermost layer of the laminate. It becomes. The adhesive film isFIG.(D),FIG.(E),FIG.As shown in (f), it may be wound around a predetermined position of the tab. 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.
[0027]
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.
[0028]
【Example】
  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 amount of chromium applied is 10 mg / m²(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.
[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 are coextruded so that the acid-modified PP side becomes an aluminum surface, and the obtained laminate is heated so that the surface temperature of aluminum becomes 150 ° C. Got.
[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 treatment 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 treatment 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. Laminate to the aluminum surface, and heat the resulting laminate so that the aluminum surface temperature is 150 ° C.Sample Comparison Example 4Got.
<Embossed molding and packaging> Example 1, Comparative Example 1 and Comparative Example 3 of the obtained specimens were formed as pouches, and Examples 2, Comparative Example 2 and Comparative Example 4 were press-molded, respectively. The following evaluation was performed.
<Evaluation method>
1) Delamination during molding
Immediately after molding, the presence or absence of delamination between the aluminum and the base material layer was confirmed.
2) Content resistance
As storage conditions, 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 the aluminum and the innermost resin layer was confirmed.
<Results> In both Example 1 and Example 2, there was no delamination during embossing and heat sealing, and no delamination due to resistant materials 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.
[0029]
【The invention's effect】
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.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating the configuration 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 a polymer battery.
FIG. 3 is a perspective view for explaining an embossed type exterior body of a polymer battery.
FIGS. 4A and 4B are views for explaining molding in an embossed type; FIG. 4A is a perspective view, FIG. 4B is an embossed exterior body body, FIG. 4C is a cross-sectional view taken along X2-X2, and FIG.
FIG. 5 is a perspective view for explaining a method of attaching an adhesive film in bonding a polymer battery packaging material and a tab.
[Explanation of symbols]
      1 Polymer battery
      2 Polymer battery body
      3 cells (power storage unit)
      4 Tab (electrode)
      5 exterior body
      6 Adhesive film (tab part)
      7 recess
      8 Side wall
      9 Seal part
      10 Laminate (Polymer battery packaging material)
      11 Base material layer
      12 Aluminum (barrier layer)
      13 Extruded resin layer
      14 Innermost resin layer
      15 Chemical conversion layer
      16 Adhesive layer
      20 Press forming section
      21 Male
      22 Female type
      23 cavity

Claims (2)

Made by subjecting both sides of aluminum to chemical conversion treatment, dry laminating the base material and one side of the aluminum that has undergone chemical conversion treatment, and then co-extruding the adhesive resin and innermost resin to the other surface subjected to the chemical conversion treatment A method for producing a polymer battery packaging material, wherein a film is formed into a laminate, and the resulting laminate is heated by post-heating under conditions such that the adhesive resin is at or above its softening point . After applying a chemical conversion treatment to one side of aluminum and dry laminating the base material and the surface of the aluminum not subjected to the chemical conversion treatment, an adhesive resin and an innermost resin are coextruded to form a film and laminated. A method for producing a packaging material for a polymer battery, wherein the resulting laminate is heated by post-heating under conditions such that the adhesive resin is at or above its softening point .

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