JP5704269B1 - Winding body for battery packaging materials - Google Patents

Abstract

The present invention provides a winding body for a battery packaging material in which defects in a coating layer are appropriately managed. A winding body for a battery packaging material comprising a laminated film in which at least a coating layer, a base material layer, a metal layer, and a sealant layer are laminated in this order. The laminated film is formed of a liquid curable resin, and the laminated film has an indent protruding from the coating layer to the sealant layer or an indent protruding from the sealant layer to the coating layer. A mark is given to the laminated film so that the position of the indentation when the area when viewed from the direction exceeds 0.2 mm 2 can be recognized, and the wound body includes a surface of the sealant layer and a surface of the coating layer. Winding body of battery packaging material, wound so as to be in contact with each other. [Selection figure] None

Description

  The present invention relates to a winding body for a battery packaging material, a method for manufacturing the winding body, and a defect inspection method for a battery packaging material.

  Conventionally, various types of batteries have been developed. In these batteries, a battery element composed of an electrode, an electrolyte and the like needs to be sealed with a packaging material or the like. Metal packaging materials are frequently used as battery packaging materials.

  In recent years, as electric vehicles, hybrid electric vehicles, personal computers, cameras, mobile phones, and the like have improved performance, batteries having various shapes have been demanded. The battery is also required to be thin and light. However, it is difficult to follow the diversification of battery shapes with metal packaging materials that have been widely used in the past. Further, since it is made of metal, there is a limit to reducing the weight of the packaging material.

  Therefore, a film-like laminated film in which a base material layer / metal layer / sealant layer are sequentially laminated has been proposed as a battery packaging material that can be easily processed into various shapes and can be reduced in thickness and weight. .

  For example, Patent Document 1 discloses a battery case including a biaxially stretched polyamide film layer as an outer layer, an unstretched thermoplastic resin film layer as an inner layer, and an aluminum foil layer disposed between the two film layers. A packaging material is disclosed.

  Such a battery packaging material is generally produced as a strip-shaped laminated film in a production line, and is stored, transported, etc. as a wound body wound up in a roll shape. And at the time of manufacture of a battery, the packaging material for batteries is unwound from a winding body, and it cuts and uses it so that it may become a predetermined shape according to the product specification of a battery.

JP 2008-287971 A

  When a battery is manufactured using the battery packaging material as described above, the electrolytic solution may adhere to the base material layer located on the outermost layer surface of the battery packaging material. When the electrolytic solution adheres to the base material layer, the base material layer may be discolored. Therefore, a coating layer having resistance to electrolytic solution may be provided on the base material layer. In recent years, with the demands for thinning and downsizing of batteries, it has been required to make each layer of battery packaging material as thin as possible. For this reason, such a coating layer is also formed very thin, for example, 5 μm or less.

  In the battery packaging material provided with such a thin coating layer, even when a minute defect (defect) exists on the surface of the coating layer, the base material layer is exposed from the defect. When the electrolytic solution comes into contact with the exposed portion of the base material layer, the portion is discolored, and the product becomes a defect. Therefore, when a battery is manufactured using a battery packaging material having a fine defect in the coating layer, the defect of the coating layer does not occur until the electrolytic solution adheres to the coating layer and discoloration occurs in the battery manufacturing process. It may be found. For this reason, when the battery packaging material is cut out from the wound body of the battery packaging material in which the defects of the coating layer are not managed and used for battery production, the yield of battery production may be reduced.

  The present invention has been made in view of such problems. That is, this invention is located in the outermost layer of the winding material of the battery packaging material by which the defect of the coating layer located in the outermost layer was managed suitably, the manufacturing method of the said winding body, and the packaging material for batteries The main object is to provide a method for inspecting defects in a coating layer.

  The present inventor has intensively studied to solve the above problems. As a result, after the battery packaging material is manufactured as a roll-shaped winding body, there is a defect in the coating layer for some reason before the battery packaging material is unwound from the winding body and used for manufacturing the battery. It was found to have occurred. The present inventor has further studied the reason for this. When the coating layer is formed of a two-component curable resin, the indentation protruding from the coating layer of the laminated film to the sealant layer is present. The convex portion due to the surface is formed at a low frequency, and when the size of the indentation (convex portion) exceeds a certain size, the surface of the sealant layer and the surface of the coating layer are in contact with each other. It was found that when the laminated film was wound, the convex portions on the surface of the sealant layer were pressed against the coating layer, and the thin coating layer was damaged. Such an indentation is considered to be formed by a slight contact of the laminated film with an apparatus or the like in the manufacturing process.

  Further, as a result of further investigation, the present inventor, contrary to the above, in the case where there is an indentation protruding from the sealant layer to the coating layer, the indentation in the convex portion due to the indentation of the coating layer is present. When the size of the (convex part) exceeds a certain size, the thickness of the coating layer on the convex part is reduced, and the laminated film is wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other. And the said convex part in the surface of a coating layer was pressed against the sealant layer, and it discovered that a defect | deletion arises in the convex part of a coating layer.

  Furthermore, in the case where the coating layer is formed of a two-component curable resin, the two-component curable resin may be taken up before being completely cured after the two-component curable resin is applied on the base material layer. It has been found that defects are particularly likely to occur when the coating layer is formed from a curable resin.

And this inventor is the winding body of the packaging material for batteries which consists of a laminated | multilayer film by which the coating layer, the base material layer, the metal layer, and the sealant layer were laminated | stacked in this order at least, Comprising: It is formed of a two-component curable resin, and the laminated film has an indent protruding from the coating layer to the sealant layer, or an indent protruding from the sealant layer to the coating layer, and the following (1) or (2 In the case of), the wound body of the battery packaging material is wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other, so that defects in the coating layer are appropriately managed. I found out that I can do it. The present invention has been completed by further studies based on these findings.
(1) On the surface of the laminated film, when the number of indentations having an area exceeding 0.2 mm ² when viewed from the lamination direction of the laminated film is within one per 100 m of the laminated film having a width of 80 to 600 mm .
(2) When the mark is given to the laminated film so that the position of the indentation when the area viewed from the lamination direction of the laminated film exceeds 0.2 mm ² can be recognized.

That is, this invention provides the invention of the aspect hung up below.
Item 1. At least a winding body for a battery packaging material comprising a laminated film in which a coating layer, a base material layer, a metal layer, and a sealant layer are laminated in this order,
The coating layer is formed of a two-component curable resin,
The laminated film has an indent protruding from the coating layer to the sealant layer, or an indent protruding from the sealant layer to the coating layer,
A mark is given to the laminated film so that the position of the indentation when the area seen from the lamination direction of the laminated film exceeds 0.2 mm ² can be recognized.
The wound body is a wound body for a battery packaging material wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other.
Item 2. Item 2. The wound body for battery packaging material according to Item 1, wherein the coating layer has a thickness of 5 µm or less.
Item 3. Item 3. The battery packaging material roll according to Item 1 or 2, wherein the laminated film has a thickness of 200 µm or less.
Item 4. Item 4. The wound body for battery packaging material according to any one of Items 1 to 3, wherein a height of the indentation protruding toward the sealant layer is 2 µm or more.
Item 5. Item 5. The wound body for battery packaging material according to any one of Items 1 to 4, wherein the wound body is a roll having a length of the laminated film of 200 m or more and a diameter of a circular cross section of 150 mm or more.
Item 6. A method for producing a wound body of a battery packaging material according to any one of Items 1 to 5,
A step of laminating a base material layer, a metal layer, and a sealant layer;
Applying the two-component curable resin to the surface of the base material layer opposite to the metal layer to form the coating layer;
After obtaining a laminated film by a laminating process including:
Indentation protruding from the coating layer to the sealant layer, or indentation protruding from the sealant layer to the coating layer, where the area when viewed from the lamination direction of the laminated film exceeds 0.2 mm ² So that the mark can be recognized on the laminated film,
Winding the laminated film so that the surface of the sealant layer and the surface of the coating layer are in contact with each other, and obtaining a winding body;
The manufacturing method of the winding body of the packaging material for batteries provided with this.
Item 7. At least a winding body for a battery packaging material comprising a laminated film in which a coating layer, a base material layer, a metal layer, and a sealant layer are laminated in this order,
The coating layer is formed of a two-component curable resin,
The laminated film has an indent protruding from the coating layer to the sealant layer, or an indent protruding from the sealant layer to the coating layer,
On the surface of the laminated film, the number of indentations having an area exceeding 0.2 mm ² when viewed from the laminating direction of the laminated film is within 1 per 100 m of the laminated film having a width of 80 to 600 mm,
The wound body is a wound body for a battery packaging material wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other.
Item 8. Item 8. The wound body for battery packaging material according to Item 7, wherein the coating layer has a thickness of 5 µm or less.
Item 9. Item 9. The winding body for battery packaging material according to Item 7 or 8, wherein the laminated film has a thickness of 200 µm or less.
Item 10. Item 10. The wound body for battery packaging material according to any one of Items 7 to 9, wherein the height of the indentation protruding toward the sealant layer is 2 μm or more.
Item 11. Item 11. The wound body for battery packaging material according to any one of Items 7 to 10, wherein the wound body has a roll shape in which the length of the laminated film is 200 m or more and the diameter of a circular cross section is 150 mm or more.
Item 12. It is a manufacturing method of the winding body of the packaging material for batteries in any one of claim | item 7-11,
A step of laminating a base material layer, a metal layer, and a sealant layer;
Applying the two-component curable resin to the surface of the base material layer opposite to the metal layer to form the coating layer;
After obtaining a laminated film by a laminating process including:
An indentation projecting from the coating layer to the sealant layer, or an indentation projecting from the sealant layer to the coating layer, where the area when viewed from the lamination direction of the laminated film exceeds 0.2 mm ² is located Removing the part to make the number of indentations with the area exceeding 0.2 mm ² within one per 100 m length of the laminated film having a width of 80 to 600 mm,
Winding the laminated film so that the surface of the sealant layer and the surface of the coating layer are in contact with each other, and obtaining a winding body;
The manufacturing method of the winding body of the packaging material for batteries provided with this.
Item 13. Item 13. The battery packaging material according to Item 12, comprising a step of providing a mark on the laminated film so that the position of the indentation in which the area of the laminated film exceeds 0.2 mm ² can be recognized in the indentation removing step. A method for manufacturing a wound body.
Item 14. A defect inspection method for a battery packaging material comprising a laminated film in which at least a coating layer formed of a two-component curable resin, a base material layer, a metal layer, and a sealant layer are laminated in this order,
The surface of the sealant layer is imaged, and the area when viewed from the laminating direction of the laminated film is an indentation exceeding 0.2 mm ² , and is an indentation protruding from the coating layer to the sealant layer, or from the sealant layer Recording the position information of the indentation protruding to the coating layer;
In accordance with the position information, a step of providing a mark on the laminated film so that the position of the indentation in which the area exceeds 0.2 mm ² can be recognized;
A defect inspection method for battery packaging materials.

  ADVANTAGE OF THE INVENTION According to this invention, the winding body of the packaging material for batteries by which the defect of the coating layer was managed appropriately can be provided. Therefore, by cutting out the battery packaging material from the wound body of the battery packaging material of the present invention and sealing the battery element, it is possible to suitably suppress the production of a battery having a defective coating layer. In addition, the yield of battery manufacturing can be improved.

It is a schematic sectional drawing of an example of the laminated film which comprises the winding body of the packaging material for batteries which concerns on this invention. It is a schematic sectional drawing of an example of the laminated film which comprises the winding body of the packaging material for batteries which concerns on this invention. It is a schematic sectional drawing of an example of the laminated film which comprises the winding body of the packaging material for batteries which concerns on this invention. It is a schematic sectional drawing of an example of the laminated film which comprises the winding body of the packaging material for batteries which concerns on this invention.

1. Winding body of first battery packaging material Winding body of the first battery packaging material of the present invention (hereinafter sometimes simply referred to as “first winding body”) is at least a coating layer A wound body of a packaging material for a battery comprising a laminated film in which a base material layer, a metal layer, and a sealant layer are laminated in this order, and the coating layer is formed of a two-component curable resin The laminated film has indentations protruding from the coating layer to the sealant layer (see, for example, FIG. 1 or FIG. 2), or indentations protruding from the sealant layer to the coating layer, (see, for example, FIG. 3 or FIG. 4) The laminate film is marked so that the position of the indentation when the area when viewed from the lamination direction of the laminate film exceeds 0.2 mm ² can be recognized, and the winding body is the surface of the sealant layer. And co Wherein the the surface of the Ingu layer is wound to be in contact. Hereinafter, the winding body of the 1st packaging material for batteries of this invention is explained in full detail, referring FIGS.

1-1. Laminated structure of battery packaging material constituting first winding body The battery packaging material constituting the first winding body of the present invention includes at least a coating layer as shown in FIGS. 6, the base material layer 1, the metal layer 3, and the sealant layer 4 consist of a laminated film laminated in this order. As will be described later, the first winding body is formed by winding the battery packaging material in a roll shape so that the surface of the sealant layer 4 and the surface of the coating layer 6 are in contact with each other.

  In the battery packaging material, the coating layer 6 is the outermost layer and the sealant layer 4 is the innermost layer. That is, when the battery is assembled, the battery element is wrapped with the battery packaging material so that the sealant layer 4 of the battery packaging material is on the inside of the battery, and the sealant layers 4 positioned at the periphery of the battery element are heat-welded. The battery element is sealed by sealing the battery element.

  The battery packaging material only needs to include at least the coating layer 6, the base material layer 1, the metal layer 3, and the sealant layer 4, and may further include other layers. For example, an adhesive layer 2 may be provided between the base material layer 1 and the metal layer 3 as necessary for the purpose of enhancing these adhesive properties. Further, for example, as shown in FIG. 2 or FIG. 4, an adhesive layer 5 may be provided between the metal layer 3 and the sealant layer 4 as necessary for the purpose of improving the adhesion.

1-2. Configuration of each layer of battery packaging material constituting first winding body [base material layer 1]
In the battery packaging material, the base material layer 1 is a layer that is positioned between a coating layer 6 and a metal layer 3 described later when the battery is assembled, and serves as a base material for the battery packaging material. About the raw material which forms the base material layer 1, it does not restrict | limit especially as long as it is provided with insulation. Examples of the material for forming the base material layer 1 include polyester, polyamide, epoxy, acrylic, fluororesin, polyurethane, silicon resin, phenol, polyetherimide, polyimide, and a mixture or copolymer thereof.

  Specific examples of the polyester include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, polycarbonate, copolymerized polyester mainly composed of ethylene terephthalate, butylene terephthalate as a repeating unit. Examples thereof include a copolymer polyester mainly used. The copolymer polyester mainly composed of ethylene terephthalate is a copolymer polyester that polymerizes with ethylene isophthalate mainly composed of ethylene terephthalate (hereinafter, polyethylene (terephthalate / isophthalate)). Abbreviated), polyethylene (terephthalate / isophthalate), polyethylene (terephthalate / adipate), polyethylene (terephthalate / sodium sulfoisophthalate), polyethylene (terephthalate / sodium isophthalate), polyethylene (terephthalate / phenyl-dicarboxylate) And polyethylene (terephthalate / decanedicarboxylate). In addition, as a copolymer polyester mainly composed of butylene terephthalate as a repeating unit, specifically, a copolymer polyester that polymerizes with butylene isophthalate having butylene terephthalate as a repeating unit (hereinafter referred to as polybutylene (terephthalate / isophthalate)). For example), polybutylene (terephthalate / adipate), polybutylene (terephthalate / sebacate), polybutylene (terephthalate / decanedicarboxylate), polybutylene naphthalate and the like. These polyesters may be used individually by 1 type, and may be used in combination of 2 or more type. Polyester has the advantage of being excellent in electrolytic solution resistance and less likely to cause whitening due to the adhesion of the electrolytic solution, and is suitably used as a material for forming the base material layer 1.

  Specific examples of polyamides include aliphatic polyamides such as nylon 6, nylon 66, nylon 610, nylon 12, nylon 46, and copolymers of nylon 6 and nylon 6,6; terephthalic acid and / or Nylon 6I, Nylon 6T, Nylon 6IT, Nylon 6I6T (I represents isophthalic acid, T represents terephthalic acid) and the like, which include a structural unit derived from isophthalic acid, Aromatic polyamides such as silylene adipamide (MXD6); alicyclic polyamides such as polyaminomethylcyclohexyl adipamide (PACM6); and lactam components and isocyanate components such as 4,4′-diphenylmethane-diisocyanate. Polymerized polyamide, co-weight Polyester amide copolymer and polyether ester amide copolymer is a copolymer of polyamide and polyester and polyalkylene ether glycol; copolymers thereof, and the like. These polyamides may be used individually by 1 type, and may be used in combination of 2 or more type. The stretched polyamide film is excellent in stretchability, can prevent whitening due to resin cracking of the base material layer 1 during molding, and is suitably used as a material for forming the base material layer 1.

  The base material layer 1 may be formed of a uniaxially or biaxially stretched resin film, or may be formed of an unstretched resin film. Among them, a uniaxially or biaxially stretched resin film, in particular, a biaxially stretched resin film has improved heat resistance by orientation crystallization, and thus is suitably used as the base material layer 1.

  Among these, as a resin film which forms the base material layer 1, Preferably nylon and polyester, More preferably, biaxially stretched nylon, biaxially stretched polyester, Most preferably, biaxially stretched nylon is mentioned.

  The base material layer 1 can also be laminated with resin films of different materials in order to improve pinhole resistance and insulation when used as a battery package. Specific examples include a multilayer structure in which a polyester film and a nylon film are laminated, and a multilayer structure in which a biaxially stretched polyester and a biaxially stretched nylon are laminated. When making the base material layer 1 into a multilayer structure, each resin film may be adhere | attached through an adhesive agent, and may be laminated | stacked directly without an adhesive agent. In the case of bonding without using an adhesive, for example, a method of bonding in a hot melt state such as a co-extrusion method, a sand lamination method, or a thermal laminating method can be mentioned. Moreover, when making it adhere | attach through an adhesive agent, the adhesive agent to be used may be a two-component curable adhesive, or a one-component curable adhesive. Further, the bonding mechanism of the adhesive is not particularly limited, and may be any of a chemical reaction type, a solvent volatilization type, a heat melting type, a hot pressure type, an electron beam curing type such as UV and EB, and the like. As an adhesive component, polyester resin, polyether resin, polyurethane resin, epoxy resin, phenol resin resin, polyamide resin, polyolefin resin, polyvinyl acetate resin, cellulose resin, (meth) acrylic resin Resins, polyimide resins, amino resins, rubbers, and silicon resins can be used.

  Although the thickness in particular of the base material layer 1 is not restrict | limited, For example, about 5 micrometers-50 micrometers, Preferably it can be set as about 12 micrometers-30 micrometers.

[Coating layer 6]
In the battery packaging material, the coating layer 6 is a layer located in the outermost layer when the battery is assembled. In the present invention, the coating layer 6 is a layer formed of a two-component curable resin mainly for the purpose of imparting electrolytic solution resistance to the battery packaging material. The two-part curable resin for forming the coating layer 6 is not particularly limited as long as it has an electrolytic solution resistance. For example, the two-part curable urethane resin, the two-part curable polyester resin, and the two-part curable type An epoxy resin etc. are mentioned. The coating layer 6 may contain a matting agent.

  Examples of the matting agent include fine particles having a particle size of about 0.5 nm to 5 μm. The material of the matting agent is not particularly limited, and examples thereof include metals, metal oxides, inorganic substances, and organic substances. The shape of the matting agent is not particularly limited, and examples thereof include a spherical shape, a fiber shape, a plate shape, an indeterminate shape, and a balloon shape. Specific examples of the matting agent include talc, silica, graphite, kaolin, montmorilloid, montmorillonite, synthetic mica, hydrotalcite, silica gel, zeolite, aluminum hydroxide, magnesium hydroxide, zinc oxide, magnesium oxide, and aluminum oxide. , Neodymium oxide, antimony oxide, titanium oxide, cerium oxide, calcium sulfate, barium sulfate, calcium carbonate, calcium silicate, lithium carbonate, calcium benzoate, calcium oxalate, magnesium stearate, alumina, carbon black, carbon nanotubes, High melting point nylon, crosslinked acrylic, crosslinked styrene, crosslinked polyethylene, benzoguanamine, gold, aluminum, copper, nickel and the like can be mentioned. These matting agents may be used individually by 1 type, and may be used in combination of 2 or more type. Among these matting agents, silica, barium sulfate, and titanium oxide are preferable from the viewpoint of dispersion stability and cost. The matting agent may be subjected to various surface treatments such as insulation treatment and high dispersibility treatment on the surface.

  The method for forming the coating layer 6 is not particularly limited, and examples thereof include a method of applying a two-component curable resin for forming the coating layer 6 on one surface of the base material layer 1. When the matting agent is blended, the matting agent may be added to the two-component curable resin, mixed, and then applied.

As shown in FIG. 3 or FIG. 4, in the battery packaging material, when there is a convex portion due to the indentation protruding from the sealant layer 4 to the coating layer 6, when the laminated film is viewed from the laminating direction among such indentations. The number of indentations 7 (convex portions) having an area of more than 0.2 mm ² generally exceeds one per 100 m of a laminated film having a width of 80 to 600 mm. In contrast, in the first wound body of the present invention, as will be described later, the number of indentations 7 having an area exceeding 0.2 mm ² is one or less per 100 m of a laminated film having a width of 80 to 600 mm. It is managed to become.

  The coating layer 6 is preferably formed thin enough to exhibit resistance to an electrolytic solution, and the thickness is preferably 5 μm or less, more preferably 3 μm or less. From the viewpoint of resistance to electrolytic solution, the lower limit of the thickness of the coating layer 6 is usually about 2 μm. The thickness of the coating layer 6 is the thickness of the portion where no indentation is formed.

[Adhesive layer 2]
In the battery packaging material, the adhesive layer 2 is a layer provided as necessary for the purpose of increasing the adhesive strength between the base material layer 1 and the metal layer 3.

  The adhesive layer 2 is formed of an adhesive capable of adhering the base material layer 1 and the metal layer 3. The adhesive used for forming the adhesive layer 2 may be a two-component curable adhesive or a one-component curable adhesive. Furthermore, the adhesive mechanism of the adhesive used for forming the adhesive layer 2 is not particularly limited, and may be any of a chemical reaction type, a solvent volatilization type, a heat melting type, a hot pressure type, and the like.

  Specific examples of the resin component of the adhesive that can be used to form the adhesive layer 2 include polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, polycarbonate, and copolyester. Resin; Polyether adhesive; Polyurethane adhesive; Epoxy resin; Phenol resin resin; Polyamide resin such as nylon 6, nylon 66, nylon 12, copolymer polyamide; polyolefin, acid-modified polyolefin, metal-modified polyolefin, etc. Polyolefin resin; polyvinyl acetate resin; cellulose adhesive; (meth) acrylic resin; polyimide resin; urea resin, melamine resin and other amino resins; chloroprene rubber, nitrile rubber, styrene - rubbers such as butadiene rubber, silicone resin; fluorinated ethylene propylene copolymer, and the like. These adhesive components may be used individually by 1 type, and may be used in combination of 2 or more type. The combination mode of two or more kinds of adhesive components is not particularly limited. For example, as the adhesive component, a mixed resin of polyamide and acid-modified polyolefin, a mixed resin of polyamide and metal-modified polyolefin, polyamide and polyester, Examples thereof include a mixed resin of polyester and acid-modified polyolefin, and a mixed resin of polyester and metal-modified polyolefin. Among these, extensibility, durability under high-humidity conditions, anti-hypertensive action, thermal deterioration-preventing action during heat sealing, etc. are excellent, and a decrease in lamination strength between the base material layer 1 and the metal layer 3 is suppressed. From the viewpoint of effectively suppressing the occurrence of delamination, a polyurethane two-component curable adhesive; polyamide, polyester, or a blended resin of these with a modified polyolefin is preferable.

  The adhesive layer 2 may be multilayered with different adhesive components. When the adhesive layer 2 is multilayered with different adhesive components, from the viewpoint of improving the lamination strength between the base material layer 1 and the metal layer 3, the adhesive component disposed on the base material layer 1 side is used as the base material layer 1. It is preferable to select a resin having excellent adhesion to the metal layer 3 and to select an adhesive component having excellent adhesion to the metal layer 3 as the adhesive component disposed on the metal layer 3 side. When the adhesive layer 2 is multilayered with different adhesive components, specifically, the adhesive component disposed on the metal layer 3 side is preferably an acid-modified polyolefin, a metal-modified polyolefin, a polyester and an acid-modified polyolefin. And a resin containing a copolyester.

  About the thickness of the contact bonding layer 2, 2-50 micrometers, for example, Preferably 3-25 micrometers is mentioned.

[Metal layer 3]
In the battery packaging material, the metal layer 3 is a layer that functions as a barrier layer for preventing water vapor, oxygen, light, and the like from entering the battery, in addition to improving the strength of the battery packaging material. Specific examples of the metal constituting the metal layer 3 include aluminum, stainless steel, and titanium, and preferably aluminum. The metal layer 3 can be formed by metal foil, metal vapor deposition, or the like, preferably by metal foil, and more preferably by aluminum foil. From the viewpoint of preventing generation of wrinkles and pinholes in the metal layer 3 during the production of the battery packaging material, for example, by using a soft aluminum foil such as annealed aluminum (JIS A8021P-O, JIS A8079P-O). More preferably, it is formed.

  Although the thickness in particular of the metal layer 3 is not restrict | limited, For example, about 10 micrometers-200 micrometers, Preferably it can be set as about 20 micrometers-100 micrometers.

  The metal layer 3 is preferably subjected to chemical conversion treatment on at least one surface, preferably both surfaces, for the purpose of stabilizing adhesion, preventing dissolution and corrosion, and the like. Here, the chemical conversion treatment refers to a treatment for forming an acid-resistant film on the surface of the metal layer. As the chemical conversion treatment, for example, chromate chromate using chromic acid compounds such as chromium nitrate, chromium fluoride, chromium sulfate, chromium acetate, chromium oxalate, chromium biphosphate, chromic acetyl acetate, chromium chloride, potassium sulfate chromium, etc. Treatment; Phosphoric acid chromate treatment using a phosphoric acid compound such as sodium phosphate, potassium phosphate, ammonium phosphate, polyphosphoric acid; aminated phenol having a repeating unit represented by the following general formulas (1) to (4) Examples include chromate treatment using a polymer.

In general formulas (1) to (4), X represents a hydrogen atom, a hydroxyl group, an alkyl group, a hydroxyalkyl group, an allyl group or a benzyl group. R ¹ and R ² are the same or different and each represents a hydroxyl group, an alkyl group, or a hydroxyalkyl group. In the general formulas (1) to (4), examples of the alkyl group represented by X, R ¹ and R ² include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, C1-C4 linear or branched alkyl groups, such as a tert- butyl group, are mentioned. Examples of the hydroxyalkyl group represented by X, R ¹ and R ² include a hydroxymethyl group, a 1-hydroxyethyl group, a 2-hydroxyethyl group, a 1-hydroxypropyl group, a 2-hydroxypropyl group, 3- C1-C4 straight or branched chain in which one hydroxy group such as hydroxypropyl group, 1-hydroxybutyl group, 2-hydroxybutyl group, 3-hydroxybutyl group, 4-hydroxybutyl group is substituted An alkyl group is mentioned. In the general formulas (1) to (4), the alkyl group and hydroxyalkyl group represented by X, R ¹ and R ² may be the same or different. In the general formulas (1) to (4), X is preferably a hydrogen atom, a hydroxyl group or a hydroxyalkyl group. The number average molecular weight of the aminated phenol polymer having the repeating units represented by the general formulas (1) to (4) is preferably, for example, 500 to 1,000,000, more preferably about 1,000 to 20,000. preferable.

  In addition, as a chemical conversion treatment method for imparting corrosion resistance to the metal layer 3, a metal oxide such as aluminum oxide, titanium oxide, cerium oxide, tin oxide, or barium sulfate fine particles dispersed in phosphoric acid is coated. A method of forming a corrosion-resistant treatment layer on the surface of the metal layer 3 by performing a baking treatment at 150 ° C. or higher can be mentioned. Further, a resin layer obtained by crosslinking a cationic polymer with a crosslinking agent may be further formed on the corrosion-resistant treatment layer. Here, examples of the cationic polymer include polyethyleneimine, an ionic polymer complex composed of a polymer having polyethyleneimine and a carboxylic acid, a primary amine graft acrylic resin obtained by graft polymerization of a primary amine on an acrylic main skeleton, and polyallylamine. Or the derivative, aminophenol, etc. are mentioned. As these cationic polymers, only one type may be used, or two or more types may be used in combination. Examples of the crosslinking agent include a compound having at least one functional group selected from the group consisting of an isocyanate group, a glycidyl group, a carboxyl group, and an oxazoline group, and a silane coupling agent. As these crosslinking agents, only one type may be used, or two or more types may be used in combination.

  As the chemical conversion treatment, only one type of chemical conversion treatment may be performed, or two or more types of chemical conversion treatment may be performed in combination. Furthermore, these chemical conversion treatments may be carried out using one kind of compound alone, or may be carried out using a combination of two or more kinds of compounds. Among the chemical conversion treatments, chromic acid chromate treatment, chromate treatment combining a chromic acid compound, a phosphoric acid compound, and an aminated phenol polymer are preferable.

The amount of the acid-resistant film formed on the surface of the metal layer 3 in the chemical conversion treatment is not particularly limited. For example, if the above chromate treatment is performed, a chromic acid compound is present per 1 m ² of the surface of the metal layer 3. About 0.5 mg to about 50 mg, preferably about 1.0 mg to about 40 mg in terms of chromium, about 0.5 mg to about 50 mg, preferably about 1.0 mg to about 40 mg in terms of phosphorus, and aminated phenol weight It is desirable that the coalescence is contained at a ratio of about 1 mg to about 200 mg, preferably about 5.0 mg to 150 mg.

  In the chemical conversion treatment, a solution containing a compound used for forming an acid-resistant film is applied to the surface of the metal layer by a bar coating method, a roll coating method, a gravure coating method, an immersion method, or the like, and then the temperature of the metal layer is 70. It is carried out by heating so as to have a temperature of from about 0 to 200 ° C. Further, before the chemical conversion treatment is performed on the metal layer, the metal layer may be previously subjected to a degreasing treatment by an alkali dipping method, an electrolytic cleaning method, an acid cleaning method, an electrolytic acid cleaning method, or the like. By performing the degreasing treatment in this way, it becomes possible to more efficiently perform the chemical conversion treatment on the surface of the metal layer.

[Adhesive layer 5]
In the battery packaging material, an adhesive layer 5 may be further provided between the metal layer 3 and the sealant layer 4 for the purpose of firmly bonding the metal layer 3 and the sealant layer 4.

  The adhesive layer 5 is formed of an adhesive component capable of bonding the metal layer 3 and a sealant layer 4 described later. The adhesive used for forming the adhesive layer 5 may be a two-component curable adhesive or a one-component curable adhesive. Moreover, it does not specifically limit about the adhesion | attachment mechanism of the adhesive agent component used for formation of the contact bonding layer 5, For example, a chemical reaction type | mold, a solvent volatilization type | mold, a hot-melt type, a hot-pressure type etc. are mentioned.

  Specific examples of the adhesive component that can be used to form the adhesive layer 5 include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, polycarbonate, copolymer polyester, and other polyester resins; polyethers Polyurethane adhesives; epoxy resins; phenol resin resins; polyamide resins such as nylon 6, nylon 66, nylon 12, copolymer polyamides; polyolefins such as polyolefins, carboxylic acid modified polyolefins, metal modified polyolefins Resin, polyvinyl acetate resin; cellulose adhesive; (meth) acrylic resin; polyimide resin; urea resin, melamine resin and other amino resins; chloroprene rubber, nitrile rubber, - styrene rubbers such as butadiene rubber; and silicone resins. These adhesive components may be used alone or in combination of two or more.

  Although the thickness in particular of the contact bonding layer 5 is not restrict | limited, For example, it is preferable to set it as about 1 micrometer-40 micrometers, and it is more preferable to set it as about 2 micrometers-about 30 micrometers.

[Sealant layer 4]
In the battery packaging material, the sealant layer 4 is a layer constituting the innermost layer of the battery packaging material when the battery is assembled. When the battery is assembled, the surfaces of the sealant layer 4 can be brought into contact with each other, and the contacted portion can be heat-welded to seal the battery element.

  The sealant layer 4 is preferably formed of a thermoplastic resin. Examples of the thermoplastic resin include polyolefin, cyclic polyolefin, carboxylic acid-modified polyolefin, carboxylic acid-modified cyclic polyolefin, and the like.

  Specific examples of polyolefins include polyethylene such as low density polyethylene, medium density polyethylene, high density polyethylene, and linear low density polyethylene; homopolypropylene, polypropylene block copolymers (for example, block copolymers of propylene and ethylene), polypropylene Crystalline or amorphous polypropylene such as random copolymers (eg, random copolymers of propylene and ethylene); ethylene-butene-propylene terpolymers, and the like. Among these polyolefins, polyethylene and polypropylene are preferable.

  Cyclic polyolefin is a copolymer of olefin and cyclic monomer. Examples of the olefin include ethylene, propylene, 4-methyl-1-pentene, styrene, butadiene, and isoprene. Examples of the cyclic monomer include cyclic alkenes such as norbornene; cyclic dienes such as cyclopentadiene, dicyclopentadiene, cyclohexadiene, norbornadiene, and the like. Among these polyolefins, a cyclic alkene is preferable, and norbornene is more preferable.

  A carboxylic acid-modified polyolefin is a polymer obtained by modifying a polyolefin with a carboxylic acid. Examples of the carboxylic acid used for modification include maleic acid, acrylic acid, itaconic acid, crotonic acid, maleic anhydride, itaconic anhydride and the like.

  The carboxylic acid-modified cyclic polyolefin is a copolymer obtained by copolymerizing a part of the monomer constituting the cyclic polyolefin in place of the α, β-unsaturated carboxylic acid or its acid anhydride, or α, β with respect to the cyclic polyolefin. -A polymer obtained by block polymerization or graft polymerization of an unsaturated carboxylic acid or its acid anhydride. The cyclic polyolefin to be modified with carboxylic acid can be the same as the above cyclic polyolefin. The carboxylic acid used for modification can be the same as that used for modification of the acid-modified cycloolefin copolymer.

  Among these thermoplastic resins, preferably crystalline or amorphous polyolefins, cyclic polyolefins, and blended polymers thereof; more preferably polyethylene, polypropylene, copolymers of ethylene and norbornene, and two of them The above blend polymer is mentioned.

  The sealant layer 4 may be formed from only one type of resin component, or may be formed from a blend polymer in which two or more types of resin components are combined. Furthermore, the sealant layer 4 may be formed of only one layer, or may be formed of two or more layers using the same or different resin components.

As shown in FIG. 1 or FIG. 2, when there is a convex portion due to the indentation protruding from the coating layer 6 to the sealant layer 4, the area when the laminated film is viewed from the lamination direction is 0.2 mm among such indentations. ^In general, the number of indentations 7 (convex portions) exceeding ² exceeds one per 100 m of a laminated film having a width of 80 to 600 mm. In contrast, in the first wound body of the present invention, as will be described later, the number of indentations 7 having an area exceeding 0.2 mm ² is one or less per 100 m of a laminated film having a width of 80 to 600 mm. It is managed to become.

In the first wound body of the present invention, the height of the indentation 7 (convex portion) having an area protruding to the sealant layer side exceeding 0.2 mm ² is usually 2 μm or more and 50 μm or less. Note that the height of the indentation 7 having an area exceeding 0.2 mm ² refers to the height from the surface of the portion of the sealant layer 4 where the indentation 7 is not formed to the apex of the indentation 7 (convex portion).

  The thickness of the sealant layer 4 is not particularly limited, but may be, for example, about 5 μm to 500 μm, preferably 10 μm to 200 μm, and more preferably 10 μm to 100 μm. In addition, the thickness of the sealant layer 4 is a thickness of a portion where no indentation is formed.

1-3. Configuration of First Winding Body In the first winding body of the present invention, the battery packaging material (laminated film) is roll-shaped so that the surface of the sealant layer 4 and the surface of the coating layer 6 are in contact with each other. It is comprised by being wound around. For example, as shown in FIG. 1 or 2, when the coating layer 6 is formed of a two-component curable resin, the area of the indentation protruding from the coating layer 6 of the laminated film to the sealant layer 4 is 0.2 mm ^2. When the laminated film is wound so that the surface of the sealant layer 4 and the surface of the coating layer 6 are in contact with each other, the convex portions on the surface of the sealant layer 4 are pressed against the coating layer 6 and are thin. Defects are particularly likely to occur in the coating layer 6. For example, as shown in FIG. 3 or FIG. 4, when the area of the indentation protruding from the sealant layer 4 to the coating layer 6 exceeds 0.2 mm ² , the thickness of the coating layer 6 becomes thin, and the sealant layer 4 When the laminated film is wound so that the surface of the coating layer 6 and the surface of the coating layer 6 are in contact with each other, the convex portions on the surface of the coating layer 6 are pressed against the sealant layer 4, and the convex portions of the coating layer 6 are particularly damaged. Prone to occur.

On the other hand, in the first winding body, the number of indentations 7 having an area exceeding 0.2 mm ² when viewed from the lamination direction of the laminated film is 1 per 100 m of the laminated film having a width of 80 to 600 mm. It is managed to be less than one. Specifically, for example, as shown in a first winding body manufacturing method described later, after each layer is laminated to produce a strip-shaped laminated film, the area is 0.2 mm ² before winding the film. By removing the portion where the indentations 7 are located from the laminated film and making the number of the indentations 7 within one per 100 m of the length of the laminated film having a width of 80 to 600 mm, the convex portions of the sealant layer by the indentations 7 Alternatively, the number of defects in the coating layer 6 that occurs when any of the convex portions of the coating layer 6 is formed is managed. That is, in the 1st winding body, since the number of such indentations 7 is managed so that it may be 1 or less per 100 m length of a laminated film with a width of 80 to 600 mm, Generation | occurrence | production of the defect of the coating layer 6 produced by the part is suppressed. Therefore, by cutting out the battery packaging material unwound from the first winding body and sealing the battery element, it is possible to suitably suppress the production of a battery having a defect in the coating layer 6. The yield of battery manufacturing can be improved. As will be described later, in the first winding body, the portion where the indentation 7 having an area exceeding 0.2 mm ² is located may be removed by cutting out only that portion or its periphery. The laminated film may be cut in the width direction so as to include the portion where the indentation 7 is located, and the laminated film may be connected with a tape or the like.

  In the first winding body, the length of the laminated film constituting the battery packaging material is not particularly limited, and is, for example, 200 m or more, preferably about 200 to 600 m. Moreover, the width | variety of the said laminated | multilayer film is about 0.01-1m, for example, Preferably about 0.1-1m is mentioned. The thickness of the laminated film is, for example, 200 μm or less, preferably about 50 to 200 μm, more preferably about 65 to 130 μm. In the roll-shaped first winding body, the diameter of the circular cross section in the direction perpendicular to the width direction of the laminated film is preferably 150 mm or more, more preferably 220 mm or more. In addition, the upper limit of the diameter of the circular section is usually about 350 mm.

1-4. First Winding Body Manufacturing Method In the first winding body manufacturing method of the present invention, the above layers having a predetermined configuration are stacked, and the number, size, etc. of the indentations 7 of the laminated film are controlled. Although it does not restrict | limit as long as what the film was wound up is obtained, For example, the following methods can be illustrated.

  First, at least the coating layer 6, the base material layer 1, the metal layer 3, and the sealant layer 4 are laminated in this order to obtain a laminated film. Specifically, for example, a laminated film is obtained as follows. First, the base material layer 1 and the metal layer 3 are laminated. This lamination can be performed, for example, by a dry lamination method using the above-described adhesive component that forms the adhesive layer 2. Moreover, as a method of laminating the base material layer 1 and the metal layer 3, a method of extruding a resin for forming the base material layer 1 on the surface of the metal layer 3 or a metal on one surface of the base material layer 1. For example, a method of forming the metal layer 3 by vapor deposition. Next, the sealant layer 4 is laminated on the metal layer 3. This lamination can be performed by, for example, a dry lamination method. In addition, for the purpose of increasing the adhesive strength between the metal layer 3 and the sealant layer 4, an adhesive component for forming the adhesive layer 5 is applied on the metal layer 3 and dried as necessary. The sealant layer 4 may be formed from above. The sealant layer 4 can be formed, for example, by melt extrusion of a thermoplastic resin. Moreover, you may form the sealant layer 4 by laminating | stacking a resin film on the metal layer 3, for example. Next, the coating layer 6 is laminated on the surface of the base material layer 1 opposite to the metal layer 3. The coating layer 6 can be formed, for example, by applying the two-component curable resin for forming the coating layer 6 to the surface of the base material layer 1. The order of the step of laminating the metal layer 3 on the surface of the base material layer 1 and the step of laminating the coating layer 6 on the surface of the base material layer 1 are not particularly limited. For example, after forming the coating layer 6 on the surface of the base material layer 1, the metal layer 3 may be formed on the surface of the base material layer 1 opposite to the coating layer 6.

  In order to improve the adhesiveness of each layer in the obtained laminated film, an aging treatment or the like may be performed. The aging treatment can be performed, for example, by heating the laminated film at a temperature of about 30 to 100 ° C. for 1 to 200 hours. Furthermore, the obtained laminated film may be heated at a temperature equal to or higher than the melting point of the sealant layer 4 in order to further improve the adhesion of each layer in the obtained laminated film. The temperature at this time is preferably the melting point of the sealant layer 4 + 5 ° C. or higher and the melting point + 100 ° C. or lower, more preferably the melting point + 10 ° C. or higher and the melting point + 80 ° C. or lower. In the present invention, the melting point of the sealant layer refers to an endothermic peak temperature in differential scanning calorimetry of the resin component constituting the sealant layer. Heating in the aging treatment and heating above the melting point of the sealant layer 4 can be performed by, for example, a hot roll contact method, a hot air method, a near or far infrared method, and the like.

  In the battery packaging material, each layer constituting the laminated film improves or stabilizes film forming properties, lamination processing, suitability for final product secondary processing (pouching, embossing), etc., as necessary. In addition, surface activation treatment such as corona treatment, blast treatment, oxidation treatment, and ozone treatment may be performed.

Next, in the laminated film, a portion where the indentation 7 having an area exceeding 0.2 mm ² when viewed from the lamination direction of the laminated film is removed, and the number of the indentations 7 having an area exceeding 0.2 mm ² is determined by the width. An indentation removing step is performed so that the number of the laminated films is 80 to 600 mm per 100 m length. The size, position, and number of the indentations 7 can be detected by, for example, a defect inspection method described later. That is, a step of imaging the surface of the sealant layer 4 and recording positional information of the indentation 7 having an area of 0.2 mm ² when viewed from the lamination direction of the laminated film, and the position of the indentation 7 according to the positional information The size, position, and number of the indentations 7 can be grasped by performing the step of applying a mark to the laminated film. Next, according to the obtained positional information, the indentation 7 is removed so that the number is one or less per 100 m of the length of the laminated film having a width of 80 to 600 mm. The portion where the indentation 7 having an area exceeding 0.2 mm ² may be removed by cutting out only that portion or its periphery, or the laminated film may be cut in the width direction including the portion where the indentation 7 is located. The laminated film may be connected with a tape or the like.

  Next, a winding process is performed in which the laminated film is wound so that the surface of the sealant layer 4 and the surface of the coating layer 6 are in contact to obtain a first wound body. The method for winding the laminated film is not particularly limited as long as the belt-like laminated film is wound in a roll shape, and may be wound on a roll or the like using a known film winder or the like.

2. Winding body of second battery packaging material Winding body of the second battery packaging material of the present invention (hereinafter sometimes simply referred to as “second winding body”) includes at least a coating layer A wound body of a packaging material for a battery comprising a laminated film in which a base material layer, a metal layer, and a sealant layer are laminated in this order, and the coating layer is formed of a two-component curable resin The laminated film has an indent protruding from the coating layer to the sealant layer, or an indent protruding from the sealant layer to the coating layer, and the area when viewed from the lamination direction of the laminated film exceeds 0.2 mm ² A mark is given to the laminated film so that the position can be recognized, and the wound body is wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other. Hereinafter, the winding body of the 2nd packaging material for batteries of this invention is explained in full detail.

2-1. Laminated structure of battery packaging material constituting second winding body The battery packaging material constituting the second winding body of the present invention is the battery packaging constituting the first winding body described above. It has a layered structure similar to the material. That is, for example, as shown in FIG. 1, at least a coating layer 6, a base material layer 1, a metal layer 3, and a sealant layer 4 are made of a laminated film laminated in this order.

2-2. Configuration of each layer of battery packaging material constituting second winding body Configuration of each layer of battery packaging material constituting second winding body, that is, coating layer 6, base material layer 1, as required The configuration of the adhesive layer 2 provided, the metal layer 3, the adhesive layer 5 provided as necessary, and the sealant layer 4 are the configurations of the layers of the battery packaging material constituting the first winding body described above. It is the same. However, the following points are different.

In the sealant layer 4 in the first wound body, the number of the indentations 7 whose area when the laminated film is viewed from the laminating direction exceeds 0.2 mm ² is 100 m in length of the laminated film having a width of 80 to 600 mm. It is managed so that there is no more than one per. On the other hand, in the sealant layer 4 in the second winding body, the number of the indentations 7 having such a size is not necessarily managed, but the laminated film can recognize the position of the indentations 7. The position of the indentation 7 is managed by adding a mark to the mark. Therefore, in the sealant layer 4 in the second wound body, the number of indentations 7 having an area when the laminated film is viewed from the laminating direction exceeds 0.2 mm ² is usually the length of the laminated film having a width of 80 to 600 mm. More than one per 100m.

2-3. Configuration of Second Winding Body In the second winding body of the present invention, the battery packaging material (laminated film) is rolled so that the surface of the sealant layer 4 and the surface of the coating layer 6 are in contact with each other. It is comprised by being wound around. In the second wound body, the indentation 7 is provided by providing a mark on the laminated film so that the position of the indentation 7 when the area when viewed from the lamination direction of the laminated film exceeds 0.2 mm ² can be recognized. The position of is managed. Specifically, as shown in a method for producing a second wound body described later, etc., after each layer is laminated to produce a strip-like laminated film, the area of the laminated film is reduced to 0. The position of the indentation 7 is managed by providing a mark on the laminated film so that the position of the indentation 7 exceeding 2 mm ² can be recognized. In the 2nd winding body, since it manages so that the position of such an indentation 7 in a laminated | multilayer film can be recognized, not only the defect in the convex part formed in the coating layer 6, but the convexity of the sealant layer 4 is also demonstrated. The defect position of the coating layer 6 in the vicinity of the part can also be easily recognized. Therefore, when the battery packaging material unwound from the second winding body is cut out and used for sealing the battery element, the battery can be manufactured while avoiding a defective portion in the coating layer 6. The manufacturing yield can be improved. In the second winding body, a mark attached so that the position of the convex portion can be recognized may be provided on the indentation 7 or may be provided in the vicinity of the indentation 7. . Moreover, such a mark can be provided using, for example, ink.

  In the second wound body, the length of the laminated film constituting the battery packaging material is not particularly limited, and is, for example, 200 m or more, preferably about 200 to 600 m. Moreover, the width | variety of the said laminated | multilayer film is about 0.01-1m, for example, Preferably about 0.1-1m is mentioned. The thickness of the laminated film is, for example, 200 μm or less, preferably about 50 to 200 μm, more preferably about 65 to 130 μm. In the roll-shaped second wound body, the diameter of the circular cross section in the direction perpendicular to the width direction of the laminated film is preferably 150 mm or more, more preferably 220 mm or more. In addition, the upper limit of the diameter of the circular section is usually about 350 mm.

2-4. Second Winding Body Manufacturing Method The second winding body manufacturing method of the present invention is the same as the above-described first winding body manufacturing method until a laminated film is obtained.

Next, in the laminated film, the indentation protruding from the coating layer 6 to the sealant layer 4 or the indentation protruding from the sealant layer 4 to the coating layer 4 has an area of 0.2 mm when viewed from the lamination direction of the laminated film. A mark applying step of applying a mark to the laminated film is performed so that the position of the indentation 7 exceeding ² can be recognized. The size, position, and number of the indentations 7 can be detected by, for example, a defect inspection method described later. That is, a step of imaging the surface of the sealant layer 4 and recording positional information of the indentation 7 having an area of 0.2 mm ² when viewed from the lamination direction of the laminated film, and the position of the indentation 7 according to the positional information The step of applying a mark to the laminated film is performed.

  Next, a winding process is performed in which the laminated film is wound so that the surface of the sealant layer 4 and the surface of the coating layer 6 are in contact to obtain a second wound body. The method for winding the laminated film is not particularly limited as long as the belt-like laminated film is wound in a roll shape, and may be wound on a roll or the like using a known film winder or the like.

3. Defect inspection method for battery packaging material The defect inspection method for battery packaging material of the present invention (hereinafter sometimes simply referred to as “defect inspection method”) includes at least a coating layer formed of a two-component curable resin, A defect inspection method for a battery packaging material comprising a laminated film in which a base material layer, a metal layer, and a sealant layer are laminated in this order. The surface of the sealant layer is imaged and viewed from the lamination direction of the laminated film. A step of recording the position information of an indentation with an area exceeding 0.2 mm ² and protruding from the coating layer to the sealant layer, or an indentation protruding from the sealant layer to the coating layer, and the area according to the position information And a step of applying a mark to the laminated film so that the position of the indentation exceeding 0.2 mm ² can be recognized.

In the defect inspection method of the present invention, the configuration of the battery packaging material used for the inspection is the same as the configuration of the battery packaging material constituting the first winding body described above. However, the following points are different. That is, in the sealant layer 4 in the first winding body, the number of the indentations 7 whose area when the laminated film is viewed from the laminating direction exceeds 0.2 mm ² is 100 m in length of the laminated film having a width of 80 to 600 mm. In contrast, the battery packaging material that is the target of the defect inspection method of the present invention is not managed in such a manner. Therefore, in the battery packaging material to be subjected to the defect inspection method of the present invention, the number of the indentations 7 having an area of more than 0.2 mm ² when the laminated film is viewed from the lamination direction is usually 80 to 600 mm in width. More than one per 100 m length of laminated film.

In the defect inspection method of the present invention, first, the surface of the sealant layer 4 of such a battery packaging material is imaged using a camera or the like, and the area when viewed from the lamination direction of the laminated film is 0.2 mm ^2. The recording process of recording the positional information of the indentation 7 exceeding is performed. At this time, it is preferable to record information such as the size and height of the indentation 7. The recording process for recording the position information of the indentation 7 can be performed by using a known defect inspection apparatus used for defect inspection such as fish eye in the film. A commercial item can be used as such a defect inspection apparatus.

Next, according to the positional information obtained in the recording process, etc., a mark applying process for applying a mark to the laminated film is performed so that the position of the indentation 7 having an area exceeding 0.2 mm ² can be recognized. The position of the mark is not particularly limited as long as it is provided so that the position of the indentation 7 can be recognized. For example, the mark may be provided on the indentation 7 or provided in the vicinity of the indentation 7. May be. Such a mark application process can also be performed by using a known defect inspection apparatus as described above. The type of the mark is not particularly limited as long as the position can be recognized. For example, an ink or the like used for a general film defect inspection apparatus can be used in the present invention.

  With the defect inspection method of the present invention, it is possible to manage the position, size, number, and the like of the indentations 7 that cause defects in the coating layer 6 as described above. That is, for example, by applying the defect inspection method of the present invention to a battery packaging material, the position of the indentation 7 in the laminated film can be recognized as in the second winding body of the present invention. It becomes possible to do. By this management, not only the defect position at the convex portion of the indentation 7 formed on the coating layer 6 but also the defect position of the coating layer 6 generated in the vicinity of the convex portion when the sealant layer 4 has the convex portion is easy. Can be recognized. Therefore, when the battery packaging material unwound from the second winding body is cut out and used for sealing the battery element, the battery can be manufactured while avoiding a defective portion in the coating layer 6. The manufacturing yield can be improved.

  In addition, by applying the defect inspection method of the present invention, the indentation 7 that can be recognized by such a mark as in the first winding body of the present invention, per 100 m length of a laminated film having a width of 80 to 600 mm. It can be removed to be within one. Therefore, by cutting out the battery packaging material unwound from the first winding body and sealing the battery element, it is possible to suitably suppress the production of a battery having a defect in the coating layer 6. The yield of battery manufacturing can be improved.

4). Use of Winding Body for Battery Packaging Material The winding body for battery packaging material of the present invention is a battery element such as a positive electrode, a negative electrode, an electrolyte, etc. by unwinding the battery packaging material and cutting it to an appropriate size. It is used as a package for hermetically sealing. That is, the battery packaging material unwound from the winding body is deformed in accordance with the shape of the battery element, and can be a packaging body that houses the battery element.

  Specifically, a battery element including at least a positive electrode, a negative electrode, and an electrolyte is formed with a flange (sealant layer) on the periphery of the battery element in a state in which a metal terminal connected to each of the positive electrode and the negative electrode protrudes outward. A region where the two come into contact with each other can be formed and covered with the battery packaging material. Next, the battery sealed with the battery packaging material (packaging body) is provided by heat-sealing and sealing the sealant layers of the flange portion. When the battery element is accommodated using the package, the sealant layer 4 of the battery packaging material is used so as to be on the inner side (surface in contact with the battery element).

  The battery packaging material unwound from the wound body of the present invention can be used for either a primary battery or a secondary battery, but is particularly suitable for use in a secondary battery. The type of the secondary battery to which the battery packaging material is applied is not particularly limited. Examples include iron storage batteries, nickel / zinc storage batteries, silver oxide / zinc storage batteries, metal-air batteries, multivalent cation batteries, capacitors and capacitors. Among these secondary batteries, lithium ion batteries and lithium ion polymer batteries can be cited as suitable applications of battery packaging materials that are unwound from the wound body of the present invention.

  Hereinafter, the present invention will be described in detail with reference to examples. However, the present invention is not limited to the examples.

[Manufacture of battery packaging materials]
On the base material layer 1 made of a stretched nylon film (thickness 25 μm), a metal layer 3 made of an aluminum foil (thickness 40 μm) subjected to chemical conversion treatment on both surfaces was laminated by a dry lamination method. Specifically, a two-component urethane adhesive (a polyol compound and an aromatic isocyanate compound) was applied to one surface of an aluminum foil to form an adhesive layer 2 (thickness 4 μm) on the metal layer 3. Next, after bonding the adhesive layer 2 and the base material layer 1 on the metal layer 3 under pressure and heating, an aging treatment is carried out at 40 ° C. for 24 hours, whereby base material layer 1 / adhesive layer 2 / metal layer 3 A laminate was prepared. In addition, the chemical conversion treatment of the aluminum foil used as the metal layer 3 is performed by rolling a treatment liquid composed of a phenol resin, a chromium fluoride compound, and phosphoric acid so that the coating amount of chromium is 10 mg / m ² (dry weight). The coating was applied to both surfaces of the aluminum foil and baked for 20 seconds under the condition that the film temperature was 180 ° C. or higher.

  Next, the resin component (mixed resin of acid-modified polypropylene resin and propylene resin) that forms the sealant layer 4 on the metal layer 3 side of the laminate is extruded in a molten state (250 ° C.), thereby the sealant on the metal layer 3. Layer 4 (thickness 50 μm) was laminated. Next, a two-component curable resin for forming the coating layer 6 was applied on the base material layer 1 by a gravure coating method to form the coating layer 6 on the base material layer 1 (thickness: 3 μm). Thus, a band-shaped battery packaging material comprising a laminated film in which coating layer 6 / base material layer 1 / adhesion layer 2 / metal layer 3 / sealant layer 4 were laminated in order was obtained.

[Defect inspection of battery packaging materials]
For the battery packaging material obtained above, using a commercially available film defect inspection apparatus, the position information of the indentation in the range of 0.03 to 3.1 mm ² as seen from the lamination direction of the laminated film is recorded, Marks were provided in the vicinity of these indentations so that the position could be recognized. The indentation formed on the laminated film included both the indentation protruding from the coating layer to the sealant layer and the indentation protruding from the sealant layer to the coating layer.

[Manufacture of winding material for battery packaging materials]
In the same manner as described above, each of the battery packaging material No. 1-12 were produced. Next, using a commercially available film winder, the battery packaging material No. 1 to 12 were wound so that the surface of the sealant layer and the surface of the coating layer were in contact with each other so that the sealant layer was inside.

Battery packaging material No. For each of the wound bodies 1 to 12, the number of indentations with an area exceeding 0.2 mm ² per 100 m of laminated film, the number of shots obtained from the wound body, the number of defective shots, the ratio of defective shots, the wound body Table 1 shows the size of the molded part formed in the battery packaging material as a result of the determination as to whether or not the product can be obtained. Note that a shot is a unit of battery packaging material required to produce one battery. In 1 to 12, a length of 100 mm was taken as one shot. Thus, for example, a battery packaging material (5000 shots) for theoretically producing 5000 batteries can be obtained from a battery packaging material having a length of 500 m, but an indentation with an area exceeding 0.2 mm ² is located. A shot to be performed becomes defective. Since a wound body with many defective shots greatly reduces the production efficiency of the battery, in order to make the wound body into a product, the number of convex portions having an area per 100 m of laminated film exceeding 0.2 mm ² is 1 It is desirable to manage less than one. Further, a battery element is placed in the molded part of the battery packaging material in the battery manufacturing process.

  In the determination of product availability in Table 1, when there were few defects and the wound body could be used as a product as it was, (◯), and when there were many defects and the wound body could not be used as a product as it was, it was marked as (X).

[Evaluation of electrolyte resistance of battery packaging materials]
Battery packaging material No. obtained above. The battery packaging material is unwound from the winding body of 2, and the defect portion of the coating layer formed by the indentation having the size shown in Table 1 is located at the center from the position of the mark, The battery packaging material was cut to a size of 100 mm × 100 mm. Next, an electrolytic solution (consisting of 1M LiPF ₆ and a mixed solution of ethylene carbonate, diethyl carbonate and dimethyl carbonate (capacity ratio 1: 1: 1)) is hung on the defective portion of the coating layer and left for 60 minutes. Then, the electrolytic solution was wiped off with ethanol, and the change of the defective portion was observed. At this time, the one that did not change at all was ○, and the base material layer located under the coating layer was slightly discolored, but the product satisfying the conditions as a product was Δ, the base material located under the coating layer The layer was greatly discolored, and the product that did not satisfy the product conditions was marked with x. The results are shown in Table 2.

From the results shown in Table 2, it has been clarified that the resistance to the electrolytic solution does not decrease when an indentation having an area of 0.2 mm ² or less exists. On the other hand, in the case where there is an indentation with an area exceeding 0.2 mm ² , it has been clarified that the coating layer is deficient to expose the base material layer and the resistance to electrolytic solution is lowered. From this result, in the wound body of the battery packaging material, by using the battery packaging material having a reduced electrolytic solution resistance by managing the size of the indentation so that the area is 0.2 mm ² or less, the battery It can be seen that the production of the battery can be suitably avoided, and the production efficiency of the battery can be improved.

  Moreover, when the coating layer of the location which the base material layer discolored was observed, what the coating layer protruded and what the coating layer was dented existed. From this result, it is considered that the defect of the portion where the coating layer protruded was caused by the thickness of the convex portion of the coating layer formed by the indentation being reduced and the convex portion contacting the sealant layer. Moreover, about the defect of the location where the coating layer was dented, it is thought that the convex part of the sealant layer formed by the indentation was pressed against the coating layer, and the thin coating layer was damaged.

DESCRIPTION OF SYMBOLS 1 ... Base material layer 2 ... Adhesive layer 3 ... Metal layer 4 ... Sealant layer 5 ... Adhesive layer 6 ... Coating layer

Claims (14)

At least a winding body for a battery packaging material comprising a laminated film in which a coating layer, a base material layer, a metal layer, and a sealant layer are laminated in this order,
The coating layer is formed of a two-component curable resin,
The laminated film has an indent protruding from the coating layer to the sealant layer, or an indent protruding from the sealant layer to the coating layer,
A mark is given to the laminated film so that the position of the indentation when the area seen from the lamination direction of the laminated film exceeds 0.2 mm ² can be recognized.
The wound body is a wound body for a battery packaging material wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other.   The winding body of the battery packaging material according to claim 1, wherein the coating layer has a thickness of 5 μm or less.   The wound body for a battery packaging material according to claim 1 or 2, wherein the thickness of the laminated film is 200 µm or less.   The wound body of the battery packaging material according to any one of claims 1 to 3, wherein a height of the indent protruding toward the sealant layer is 2 µm or more.   The said winding body is a winding body of the packaging material for batteries in any one of Claims 1-4 whose length of the said laminated | multilayer film is a roll shape whose diameter of a circular cross section is 150 mm or more. It is a manufacturing method of the winding body of the packaging material for batteries in any one of Claims 1-5,
A step of laminating a base material layer, a metal layer, and a sealant layer;
Applying the two-component curable resin to the surface of the base material layer opposite to the metal layer to form the coating layer;
After obtaining a laminated film by a laminating process including:
Indentation protruding from the coating layer to the sealant layer, or indentation protruding from the sealant layer to the coating layer, where the area when viewed from the lamination direction of the laminated film exceeds 0.2 mm ² So that the mark can be recognized on the laminated film,
Winding the laminated film so that the surface of the sealant layer and the surface of the coating layer are in contact with each other, and obtaining a winding body;
The manufacturing method of the winding body of the packaging material for batteries provided with this. At least a winding body for a battery packaging material comprising a laminated film in which a coating layer, a base material layer, a metal layer, and a sealant layer are laminated in this order,
The coating layer is formed of a two-component curable resin,
The laminated film has an indent protruding from the coating layer to the sealant layer, or an indent protruding from the sealant layer to the coating layer,
On the surface of the laminated film, the number of indentations having an area exceeding 0.2 mm ² when viewed from the laminating direction of the laminated film is within 1 per 100 m of the laminated film having a width of 80 to 600 mm,
The wound body is a wound body for a battery packaging material wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other.   The wound body of the battery packaging material according to claim 7, wherein the coating layer has a thickness of 5 μm or less.   The wound body of the packaging material for a battery according to claim 7 or 8, wherein the laminated film has a thickness of 200 µm or less.   The wound body of the battery packaging material according to any one of claims 7 to 9, wherein a height of the indent protruding toward the sealant layer is 2 µm or more.   The said wound body is a wound body of the packaging material for batteries in any one of Claims 7-10 whose length of the said laminated | multilayer film is a roll shape whose diameter of a circular cross section is 150 mm or more. It is a manufacturing method of the winding body of the packaging material for batteries in any one of Claims 7-11,
A step of laminating a base material layer, a metal layer, and a sealant layer;
Applying the two-component curable resin to the surface of the base material layer opposite to the metal layer to form the coating layer;
After obtaining a laminated film by a laminating process including:
An indentation projecting from the coating layer to the sealant layer, or an indentation projecting from the sealant layer to the coating layer, where the area when viewed from the lamination direction of the laminated film exceeds 0.2 mm ² is located Removing the part to make the number of indentations with the area exceeding 0.2 mm ² within one per 100 m length of the laminated film having a width of 80 to 600 mm,
Winding the laminated film so that the surface of the sealant layer and the surface of the coating layer are in contact with each other, and obtaining a winding body;
The manufacturing method of the winding body of the packaging material for batteries provided with this. The battery packaging material according to claim 12, comprising a step of providing a mark on the laminated film so that the position of the indentation in which the area of the laminated film exceeds 0.2 mm ² can be recognized in the indentation removing step. Manufacturing method of the wound body of A defect inspection method for a battery packaging material comprising a laminated film in which at least a coating layer formed of a two-component curable resin, a base material layer, a metal layer, and a sealant layer are laminated in this order,
The surface of the sealant layer is imaged, and the area when viewed from the laminating direction of the laminated film is an indentation exceeding 0.2 mm ² , and is an indentation protruding from the coating layer to the sealant layer, or from the sealant layer Recording the position information of the indentation protruding to the coating layer;
In accordance with the position information, a step of providing a mark on the laminated film so that the position of the indentation in which the area exceeds 0.2 mm ² can be recognized;
A defect inspection method for battery packaging materials.