JP6503826B2 - Winding body of packaging material for battery - Google Patents

Description

  The present invention relates to a winding body of a battery packaging material and a method of manufacturing the same.

  Conventionally, various types of batteries have been developed. In these batteries, a battery element constituted by an electrode, an electrolytic solution and the like needs to be sealed by a packaging material and the like. Metal packaging materials are widely used as battery packaging materials.

  In recent years, with the advancement of performance of electric vehicles, hybrid electric vehicles, personal computers, cameras, mobile phones, etc., batteries having various shapes are required. Moreover, thickness reduction, weight reduction, etc. are also calculated | required by the battery. However, it is difficult to follow the diversification of battery shapes with metal packaging materials that are frequently used conventionally. Moreover, since it is metal, there is a limit to weight reduction of the packaging material.

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

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

  Such a battery packaging material is generally manufactured as a strip-like laminated film in a production line, and is stored, transported, etc. as a wound body obtained by winding the film into a roll. And at the time of manufacture of a battery, the packaging material for batteries is unwound from a winding body, and it cut | judges and is used so that it may become a predetermined | prescribed shape according to the product specification of a battery.

JP 2008-287971 A

  In order to improve the safety and extend the life of a battery using a battery packaging material composed of a laminated film in which a metal layer and a sealant layer are laminated, it is necessary to minimize moisture permeation through the battery packaging material. is there. Therefore, generally, in the process of manufacturing the battery packaging material, pinholes in the metal layer are controlled and produced with particular emphasis, and in the case of the battery packaging material in which the pinholes are present in the metal layer, the pinholes are The product is commercialized by uniformly removing the surrounding area where the Such uniform removal of the pinhole portion lowers the production yield of the battery packaging material, resulting in an increase in battery production cost.

  In view of the problems of the prior art as described above, the present invention can effectively suppress the permeation of water into the battery and can suppress the increase in the manufacturing cost of the battery. SUMMARY OF THE INVENTION It is a primary object of the present invention to provide a winding body and a method of manufacturing the same.

The present inventors diligently studied to solve the above-mentioned problems. In particular, research was conducted on the relationship between pinholes in the metal layer and the water content in the battery element. As a result, if the total area of the pinholes present in the battery is smaller than a predetermined size in each battery, the water permeation amount in a predetermined period is set to a predetermined value even when a pinhole is present in the metal layer. It has become clear that (for example, the water content in the battery element can be controlled to 500 ppm or less). Furthermore, we also found that the total area of acceptable pinholes varies with the size of the cell. Specifically, for example, in the case of a vehicle-mounted battery, the surface area of the battery (that is, the surface area of the battery packaging material) is generally as large as about 300 to 1300 cm ² and the volume of the battery element is large. It has been confirmed that the total area of pinholes for which the transmission amount is a predetermined value is larger than that of a mobile battery (the surface area of the battery is generally about 4 to 300 cm ² ).

  Based on the above examinations, the inventors of the present invention provide marks on the winding body of the battery packaging material so that the positions of the pinholes of the metal layer can be recognized, and the positions and sizes of the pinholes. I came to remember to manage the And thereby, the area | region where the pinhole which can control the water permeation amount in a predetermined period below in a predetermined value does not remove uniformly the area | region where a pinhole exists from the winding body of the packaging material for batteries is Water permeation into the battery can be effectively suppressed by manufacturing it as a battery packaging material compatible with the battery application without removing it from the winding body, and reducing the manufacturing cost of the battery I found out what I could do. The present invention is an invention completed by repeating studies based on these findings.

That is, the present invention provides the inventions of the aspects listed below.
Item 1. A winding body of a battery packaging material comprising a laminated film in which at least a metal layer and a sealant layer are laminated in this order,
There are pinholes in the metal layer,
A wound body of a packaging material for a battery, wherein a mark is provided on the laminated film so that the position of the pinhole can be recognized.
Item 2. The winding body of the packaging material for a battery according to Item 1, wherein different marks are given to the laminated film in accordance with the size of the total area of the pinholes present in the predetermined range of the laminated film.
Item 3. The predetermined range of the laminated film is 300 to 1300 cm ² ,
The winding body of the packaging material for a battery according to item 2, wherein the total area of pinholes present in the predetermined range includes a portion having 2000 to 100000 μm ² .
Item 4. The predetermined range of the laminated film is 4 to 300 cm ² ,
The windup body of the packaging material for batteries of claim 2 including a portion in which the total area of pinholes present in the predetermined range is 300 to 2000 μm ² .
Item 5. The windup body of the packaging material for batteries according to any one of Items 1 to 4, wherein the thickness of the metal layer is 50 μm or less.
Item 6. The winding body of the packaging material for a battery according to any one of Items 1 to 5, wherein the winding body is a roll having a length of 200 m or more and a circular cross section having a diameter of 150 mm or more.
Item 7. It is a manufacturing method of the winding body of the packaging material for batteries in any one of claim 1 to 6,
Manufacturing a laminated film by at least laminating a metal layer and a sealant layer;
A marking process for applying a mark to the laminated film so that the position of the pinhole present in the metal layer can be recognized;
A winding step of winding the laminated film to obtain a winding body;
The manufacturing method of the winding body of the packaging material for batteries provided with these.
Item 8. The winding of the battery packaging material according to item 7, wherein in the marking step, different marks are given to the laminated film according to the size of the total area of the pinholes present in the predetermined range of the laminated film. How to make the body.
Item 9. The predetermined range of the laminated film is 300 to 1300 cm ² ,
Item 9. The method for producing a winding body of a battery packaging material according to item 8, wherein a total area of pinholes present in the predetermined range is 2000 to 100000 μm ² .
Item 10. The predetermined range of the laminated film is 4 to 300 cm ² ,
Item 9. The method for producing a winding body of a battery packaging material according to item 8, wherein a total area of pinholes present in the predetermined range is 300 to 2000 μm ² .
Item 11. 11. The method for producing a winding body of a battery packaging material according to any one of Items 7 to 10, wherein the thickness of the metal layer is 50 μm or less.
Item 12. Item 12. The method for producing a winding material for a battery packaging material according to any one of items 7 to 11, wherein the winding body is a roll having a length of 200 m or more and a circular cross section having a diameter of 180 mm or more. .

  According to the present invention, it is possible to provide a winding body of a packaging material for a battery, which can effectively suppress moisture permeation into the battery and can reduce the manufacturing cost of the battery, and a method of manufacturing the same. .

BRIEF DESCRIPTION OF THE DRAWINGS It is schematic-drawing 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. BRIEF DESCRIPTION OF THE DRAWINGS It is schematic-drawing 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. BRIEF DESCRIPTION OF THE DRAWINGS It is schematic-drawing 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 diagram of the laminated film in which the mark was provided in the vicinity of the position where a pinhole exists.

1. Winding Body of Battery Packaging Material The winding body of the battery packaging material of the present invention is a winding body of a battery packaging material comprising a laminated film in which at least a metal layer and a sealant layer are laminated, The metal layer has a pinhole and is characterized in that the laminated film is marked so that the position of the pinhole can be recognized. Hereinafter, the winding body of the packaging material for a battery of the present invention will be described in detail with reference to FIGS.

Laminated structure of battery packaging material constituting winding body The battery packaging material constituting the winding body of the present invention has, for example, at least a metal layer 1 and a sealant layer 2 laminated as shown in FIG. It consists of laminated films. As described later, in the winding body of the present invention, the battery packaging material is wound in a roll. The winding body of the present invention may be wound so that the sealant layer 2 of the battery packaging material is on the inside, or is wound so that the metal layer 1 is on the inside. May be

  The battery packaging material constituting the winding body may include at least the metal layer 1 and the sealant layer 2 as shown in, for example, FIG. 1, and may further include other layers as necessary. It is also good. For example, as shown in FIG. 2 and FIG. 3, the battery packaging material may optionally include a base material layer 3, an adhesive layer 4 disposed between the base material layer 3 and the metal layer 1, and a metal layer 1. And the sealant layer 2 may be provided. Moreover, although not shown in figure, you may have a coating layer on the opposite side to the metal layer 1 of the base material layer 3. As shown in FIG.

  In the battery packaging material, the metal layer 1 side is the outside of the battery, and the sealant layer 2 side is the inside of the battery (battery element side). That is, when assembling the battery, the battery element is enclosed by the battery packaging material so that the sealant layer 2 of the battery packaging material is on the inside of the battery, and the sealant layers 2 located at the periphery of the battery element are thermally welded By sealing the battery element, the battery element is sealed.

Configuration of Each Layer of Battery Packaging Material Constituting Winding Body [Metal Layer 1]
In the battery packaging material, the metal layer 1 is a layer that functions as a barrier layer to prevent water vapor, oxygen, light and the like from invading the inside of the battery, in addition to the strength improvement of the battery packaging material. Specifically as a metal which comprises the metal layer 1, aluminum, stainless steel, titanium etc. are mentioned, Preferably aluminum is mentioned. The metal layer 1 can be formed by metal foil, metal vapor deposition or the like, preferably formed by metal foil, and more preferably formed by aluminum foil. From the viewpoint of preventing the occurrence of wrinkles and pinholes in the metal layer 1 during the production of the battery packaging material, for example, with a soft aluminum foil such as annealed aluminum (JIf A8021P-O, JIS A8079P-O) It is more preferable to form.

  The thickness of the metal layer 1 is not particularly limited, but from the viewpoint of suppressing water permeation by pinholes of the metal layer 1 while reducing the weight and thickness of the battery packaging material further, for example, about 10 to 100 μm, Is about 10 to 50 μm, and further about 10 to 35 μm. In the winding body of the packaging material for a battery of the present invention, the thickness of the metal layer 1 is as thin as, for example, 50 μm or less, and the presence of pinholes in the metal layer used for producing the packaging material for a battery is unavoidable Also in the winding body of the present invention, a mark is provided so that the position of the pinhole of the metal layer can be recognized, so based on this information, the size of the pinhole etc. is confirmed, and the use of the battery The winding body of the battery packaging material compatible with (for example, for on-vehicle use, for mobile devices, etc.) can be selected. Therefore, in the winding body of the present invention, not all the areas where the pinholes are present are uniformly removed, but the area where the pinholes where the water permeation amount in a predetermined period can be controlled to a predetermined value or less is present. By making the battery packaging material compatible with battery applications not removed from the winding body, it is possible to effectively suppress moisture permeation into the battery and at the cost of manufacturing the battery. It can be reduced.

  In addition, it is preferable that at least one surface, preferably both surfaces, of the metal layer 1 be subjected to chemical conversion treatment in order to stabilize adhesion, to prevent dissolution or 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 a chromate compound such as chromium nitrate, chromium fluoride, chromium sulfate, chromium acetate, chromium oxalate, chromium biphosphate, chromate acetyl acetate, chromium chloride, potassium chromium sulfate, etc. Treatment; Phosphoric acid chromate treatment using phosphoric acid compounds such as sodium phosphate, potassium phosphate, ammonium phosphate, polyphosphoric acid, etc .; Aminated phenol having repeating units represented by the following general formulas (1) to (4) The chromate process etc. which used the polymer are mentioned. In the aminated phenol polymer, repeating units represented by the following general formulas (1) to (4) may be contained singly or in any combination of two or more. It is also good.

In the 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. In addition, R ¹ and R ² are the same or different and each independently represent 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 and an isobutyl group, C1-C4 linear or branched alkyl groups, such as a tert- butyl group, are mentioned. Also, examples of the hydroxyalkyl group represented by X, R ¹ and R ² include, for example, hydroxymethyl group, 1-hydroxyethyl group, 2-hydroxyethyl group, 1-hydroxypropyl group, 2-hydroxypropyl group, 3- C1-C4 linear or branched one substituted with one hydroxy group such as hydroxypropyl, 1-hydroxybutyl, 2-hydroxybutyl, 3-hydroxybutyl, 4-hydroxybutyl and the like An alkyl group is mentioned. In the general formulas (1) to (4), the alkyl group and the hydroxyalkyl group represented by X, R ¹ and R ² may be identical to or different from each other. 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 repeating units represented by the general formulas (1) to (4) is, for example, preferably 500 to 1,000,000, and more preferably about 1 to 20,000. preferable.

  In addition, as a chemical conversion treatment method for imparting corrosion resistance to the metal layer 1, a coating obtained by dispersing fine particles of metal oxide such as aluminum oxide, titanium oxide, cerium oxide, tin oxide or barium sulfate in phosphoric acid is coated; By performing baking treatment at 150 ° C. or higher, a method of forming a corrosion resistant treatment layer on the surface of the metal layer 1 may be mentioned. In addition, a resin layer obtained by crosslinking the cationic polymer with a crosslinking agent may be further formed on the corrosion-resistant layer. Here, as the cationic polymer, for example, polyethylene imine, an ionic polymer complex composed of polyethylene imine and a polymer having a carboxylic acid, primary amine graft acrylic resin obtained by graft polymerizing a primary amine on an acrylic main skeleton, polyallylamine Or derivatives thereof, aminophenol and the like. As these cationic polymers, only 1 type may be used and you may use combining 2 or more types. Moreover, as a crosslinking agent, the compound which has an at least 1 sort (s) of functional group chosen from the group which consists of an isocyanate group, a glycidyl group, a carboxyl group, and an oxazoline group, a silane coupling agent etc. are mentioned, for example. As these crosslinking agents, only one type may be used, or two or more types may be used in combination.

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

The amount of acid-resistant coatings to be formed on the surface of the metal layer 1 in the chemical conversion treatment is not particularly limited, for example, in the case of performing the above-mentioned chromate treatment, the surface 1 m ² per metal layer 1, chromic acid compounds 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, of the phosphorus compound in terms of phosphorus, and aminated phenol weight It is desirable that the combination be contained in a proportion of about 1 mg to about 200 mg, preferably about 5.0 mg to 150 mg.

  In the chemical conversion treatment, the temperature of the metal layer is 70 after the solution containing the compound used for forming the acid resistant coating is applied to the surface of the metal layer by the bar coat method, roll coat method, gravure coat method, immersion method or the like. It is carried out by heating so that it may become about -200 degreeC. In addition, before the metal layer is subjected to chemical conversion treatment, the metal layer may be subjected in advance to 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 as described above, the chemical conversion treatment of the surface of the metal layer can be performed more efficiently.

[Sealant layer 2]
In the battery packaging material, the sealant layer 2 is a layer that constitutes the innermost layer of the battery packaging material when the battery is assembled. At the time of assembly of the battery, the surfaces of the sealant layer 2 can be brought into contact with each other, and the contact portion can be heat-welded to seal the battery element.

  The sealant layer 2 is preferably formed of a thermoplastic resin. As a thermoplastic resin, polyolefin, cyclic polyolefin, carboxylic acid modified polyolefin, carboxylic acid modified cyclic polyolefin etc. are mentioned, for example.

  Specific examples of the polyolefin include polyethylenes such as low density polyethylene, medium density polyethylene, high density polyethylene and linear low density polyethylene; homopolypropylene, block copolymers of polypropylene (for example, block copolymers of propylene and ethylene), polypropylene Examples include crystalline or non-crystalline polypropylene such as random copolymer (for example, random copolymer of propylene and ethylene); terpolymer of ethylene-butene-propylene and the like. Among these polyolefins, polyethylene and polypropylene are preferred.

  Cyclic polyolefins are copolymers of olefins and cyclic monomers. Examples of the olefin include ethylene, propylene, 4-methyl-1-pentene, styrene, butadiene, isoprene and the like. Moreover, as a cyclic monomer, cyclic alkenes, such as norbornene; Cyclic dienes, such as cyclopentadiene, dicyclopentadiene, cyclohexadiene, norbornadiene, etc. are mentioned, for example. Among these polyolefins, cyclic alkenes are preferred, and norbornene is more preferred.

  The 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.

  Carboxylic acid-modified cyclic polyolefin is obtained by copolymerizing part of monomers constituting cyclic polyolefin with α, β-unsaturated carboxylic acid or its acid anhydride, or by copolymerizing α, β to cyclic polyolefin A polymer obtained by block polymerization or graft polymerization of an unsaturated carboxylic acid or an acid anhydride thereof. The cyclic polyolefin to be carboxylic acid modified can be similar to the cyclic polyolefin described above. Moreover, as a carboxylic acid used for modification | denaturation, it can be made to be the same as that used for modification | denaturation of said acid-modified cycloolefin copolymer.

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

  The sealant layer 2 may be formed of only one type of resin component, or may be formed of a blend polymer in which two or more types of resin components are combined. Furthermore, the sealant layer 2 may be formed of only one layer, or may be formed of two or more layers of the same or different resin components. When the sealant layer 2 is formed of a plurality of layers, preferably, two layers of a layer formed of carboxylic acid-modified polypropylene and a layer formed of polypropylene are sequentially laminated as the sealant layer 2 from the side of the metal layer 1 Are listed.

  The thickness of the sealant layer 2 is not particularly limited, but can be, for example, about 2 μm to 200 μm, preferably about 5 μm to 150 μm, and more preferably 10 μm to 100 μm.

[Base material layer 3]
In the battery packaging material, the base material layer 3 may be provided on the outside of the metal layer 1 as necessary. The base material layer 3 is a layer to be a base material of the battery packaging material. From the viewpoint of enhancing the chemical resistance, shape retention and the like of the battery, the battery packaging material preferably has the base layer 3. The material for forming the base layer 3 is not particularly limited as long as it has insulation properties. As a raw material which forms the base material layer 3, polyester, a polyamide, an epoxy, an acryl, a fluorine resin, polyurethane, a silicone resin, a phenol, a polyether imide, a polyimide, and these mixtures, a copolymer, etc. are mentioned, for example.

  Specific examples of the polyester include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, polycarbonate, copolymer polyester having ethylene terephthalate as a main unit of repeating unit, and butylene terephthalate as a repeating unit Copolymer polyester etc. which made the main are mentioned. Further, as a copolymerized polyester having ethylene terephthalate as the main component of the repeating unit, specifically, a copolymer polyester in which ethylene terephthalate is polymerized as the main component of the repeating unit with ethylene isophthalate (hereinafter, polyethylene (terephthalate / isophthalate) Polyethylene (terephthalate / isophthalate), polyethylene (terephthalate / adipate), polyethylene (terephthalate / sodium sulfoisophthalate), polyethylene (terephthalate / sodium isophthalate), polyethylene (terephthalate / phenyl-dicarboxylate) , Polyethylene (terephthalate / decane dicarboxylate) and the like. Further, as a copolymerized polyester having butylene terephthalate as the main component of the repeating unit, specifically, a copolymer polyester in which butylene terephthalate is polymerized with butylene isophthalate as the main component of the repeating unit (hereinafter, polybutylene (terephthalate / isophthalate) And polybutylene (terephthalate / adipate), polybutylene (terephthalate / sebacate), polybutylene (terephthalate / decanedicarboxylate), polybutylene naphthalate and the like. These polyesters may be used alone or in combination of two or more. Polyester has an advantage that it is excellent in electrolytic solution resistance and is less likely to cause whitening or the like due to adhesion of the electrolytic solution, and is suitably used as a forming material of the base material layer 3.

  Further, as polyamides, specifically, aliphatic polyamides such as nylon 6, nylon 66, nylon 610, nylon 12, nylon 46, copolymers of nylon 6 and nylon 6, 6 etc .; terephthalic acid and / or Hexamethylenediamine-isophthalic acid-terephthalic acid copolymerized polyamide such as nylon 6I, nylon 6T, nylon 6IT, nylon 6 I 6T (I is isophthalic acid, T represents terephthalic acid) containing a constitutional unit derived from isophthalic acid, polycarbonate Polyamides containing an aromatic group such as silylene adipamide (MXD6); alicyclic polyamides such as polyaminomethyl cyclohexyl adipamide (PACM 6); and lactam components and isocyanate components such as 4,4'-diphenylmethane diisocyanate. Polymerized polyamide, coweight 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 alone or in combination of two or more. The stretched polyamide film is excellent in stretchability, can prevent the occurrence of whitening due to resin cracking of the base material layer 3 during molding, and is suitably used as a forming material of the base material layer 3.

  The base material layer 3 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, is suitably used as the base layer 3 because its heat resistance is improved by orientation crystallization.

  Among these, as a resin film which forms the base material layer 3, Preferably nylon, polyester, More preferably, biaxially stretched nylon, biaxially stretched polyester, Especially preferably biaxially stretched nylon is mentioned.

  The base material layer 3 can also be formed by laminating resin films of different materials in order to improve the pinhole resistance and the insulation property of the battery package. Specifically, a multilayer structure in which a polyester film and a nylon film are laminated, a multilayer structure in which a biaxially oriented polyester and a biaxially oriented nylon are laminated, and the like can be mentioned. When the base material layer 3 has a multilayer structure, each resin film may be bonded via an adhesive or may be directly laminated without using an adhesive. In the case of bonding without using an adhesive, for example, a method of bonding in a hot-melted state such as a coextrusion method, a sand lamination method, a thermal lamination method and the like can be mentioned. Moreover, when making it adhere | attach through an adhesive agent, the adhesive agent to be used may be a 2 liquid curing adhesive, and may be a 1 liquid curing adhesive. Furthermore, the adhesion 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 heat pressure type, an electron beam curing type such as UV and EB, and the like. As components of adhesives, polyester resin, polyether resin, polyurethane resin, epoxy resin, phenol resin resin, polyamide resin, polyolefin resin, polyvinyl acetate resin, cellulose resin, (meth) acrylic resin A resin, a polyimide resin, an amino resin, rubber, and a silicone resin are mentioned.

  The thickness of the base material layer 3 is not particularly limited, but can be, for example, about 5 μm to 50 μm, and preferably about 12 μm to 30 μm.

[Coating layer]
In the battery packaging material, the optionally provided coating layer is a layer located on the outer side (the outermost layer) of the base material layer 3 when the battery is assembled. In the present invention, the coating layer is formed of, for example, a two-component curable resin, mainly for the purpose of imparting electrolyte resistance to a battery packaging material. The two-component curable resin for forming the coating layer is not particularly limited as long as it has electrolytic solution resistance, but, for example, a two-component curable urethane resin, a two-component curable polyester resin, and a two-component curable epoxy Resin etc. are mentioned. Further, a matting agent may be blended in the coating layer.

  Examples of the matting agent include fine particles having a particle diameter 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 also not particularly limited, and examples thereof include spheres, fibers, plates, indeterminate shapes, and balloons. As a matting agent, specifically, talc, silica, graphite, kaolin, montmorrroid, montmorillonite, synthetic mica, hydrotalcite, silica gel, zeolite, aluminum hydroxide, magnesium hydroxide, zinc oxide, magnesium oxide, 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, Examples thereof include high melting point nylon, crosslinked acrylic, crosslinked styrene, crosslinked polyethylene, benzoguanamine, gold, aluminum, copper, nickel and the like. These matting agents may be used alone or in combination of two or more. Among these matting agents, preferred are silica, barium sulfate and titanium oxide from the viewpoint of dispersion stability and cost. In addition, the surface of the matting agent may be subjected to various surface treatments such as insulation treatment and high dispersion treatment.

  Although it does not restrict | limit especially as a method to form a coating layer, For example, the method of apply | coating 2-component curable resin which forms a coating layer on one surface of the base material layer 3 is mentioned. In the case of blending the matting agent, the two-component curable resin may be added after being mixed with the matting agent and then applied.

  The coating layer is preferably formed as thin as possible to exhibit electrolyte resistance, and the thickness thereof is preferably 5 μm or less, more preferably 3 μm or less. From the viewpoint of electrolyte resistance, the lower limit value of the thickness of the coating layer is usually about 2 μm.

[Adhesive layer 4]
In the battery packaging material, the adhesive layer 4 is a layer provided as necessary for the purpose of enhancing the adhesive strength between the base layer 3 and the metal layer 1.

  The adhesive layer 4 is formed of an adhesive capable of adhering the base layer 3 and the metal layer 1. The adhesive used to form the adhesive layer 4 may be a two-part curable adhesive, or may be a one-part curable adhesive. Furthermore, the adhesion mechanism of the adhesive used to form the adhesion layer 4 is not particularly limited, and may be any of a chemical reaction type, a solvent volatilization type, a heat melting type, a heat pressure type, and the like.

  Specific examples of the resin component of the adhesive that can be used to form the adhesive layer 4 include polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, polycarbonate, copolyester, etc. Resins; Polyether adhesives; Polyurethane adhesives; Epoxy resins; Phenolic resins; Polyamide resins such as nylon 6, nylon 66, nylon 12, copolymerized polyamides, etc. Polyolefins, acid-modified polyolefins, metal-modified polyolefins, etc. Polyolefin-based resins; polyvinyl acetate-based resins; cellulose-based adhesives; (meth) acrylic-based resins; polyimide-based resins; amino resins such as urea resins and melamine 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 alone or in combination of two or more. The combination mode of two or more adhesive components is not particularly limited, but, for example, as the adhesive component, a mixed resin of a polyamide and an acid-modified polyolefin, a mixed resin of a polyamide and a metal-modified polyolefin, a polyamide and a polyester, A mixed resin of polyester and acid-modified polyolefin, a mixed resin of polyester and metal-modified polyolefin, and the like can be mentioned. Among them, the ductility, durability under high humidity conditions and a response suppressing action, a heat degradation suppressing action and the like are excellent, and a decrease in the lamination strength between the substrate layer 3 and the metal layer 1 is suppressed. From the viewpoint of effectively suppressing the occurrence of delamination, polyurethane-based two-component curing adhesives; polyamides, polyesters, or blend resins of these with modified polyolefins are preferably mentioned.

  In addition, the adhesive layer 4 may be multilayered with different adhesive components. When the adhesive layer 4 is multilayered with different adhesive components, from the viewpoint of improving the lamination strength between the substrate layer 3 and the metal layer 1, the adhesive component disposed on the substrate layer 3 side is used as the substrate layer 3. It is preferable to select a resin that is excellent in adhesion with the resin, and to select an adhesive component that is excellent in adhesion to the metal layer 1 as the adhesive component disposed on the metal layer 1 side. When the adhesive layer 4 is multilayered with different adhesive components, specifically, as an adhesive component disposed on the metal layer 1 side, preferably, acid-modified polyolefin, metal-modified polyolefin, polyester and acid-modified polyolefin are used. And resins containing copolymerized polyesters.

  The thickness of the adhesive layer 4 is, for example, about 2 to 50 μm, preferably about 3 to 25 μm.

[Adhesive layer 5]
In the battery packaging material, an adhesive layer 5 may be further provided between the metal layer 1 and the sealant layer 2 as needed for the purpose of firmly bonding the metal layer 1 and the sealant layer 2 or the like. .

  The adhesive layer 5 is formed of an adhesive component capable of adhering the metal layer 1 and the sealant layer 2 described later. The adhesive used to form the adhesive layer 5 may be a two-part curable adhesive or a one-part curable adhesive. Moreover, it does not specifically limit about the adhesion mechanism of the adhesive agent component used for formation of the contact bonding layer 5, For example, a chemical reaction type, a solvent volatilization type, heat melting type, heat pressure type etc. are mentioned.

  Specific examples of the adhesive component that can be used to form the adhesive layer 5 include polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, polycarbonate, copolyester, etc .; polyether Adhesives; Polyurethane adhesive; Epoxy resin; Phenolic resin resin; Polyamide resin such as nylon 6, nylon 66, nylon 12, copolymerized polyamide; Polyolefin resin such as polyolefin, carboxylic acid modified polyolefin, metal modified polyolefin Resin, polyvinyl acetate resin; cellulose adhesive; (meth) acrylic resin; polyimide resin; amino resin such as urea resin, melamine resin; 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.

  The thickness of the adhesive layer 5 is not particularly limited, but is preferably, for example, about 1 μm to 40 μm, and more preferably about 2 μm to 30 μm.

Configuration of Winding Body The winding body of the present invention is configured by winding the above-described battery packaging material (laminated film) in a roll. The winding body may be wound up so that the sealant layer 2 of the battery packaging material is inside, or the metal layer 1 (in the case of having the base layer 3, the base layer 3) May be wound so as to be inside.

  At least one pin hole is present in the metal layer 1 of the laminated film constituting the winding body of the present invention. In the winding body, a plurality of pinholes may exist in the metal layer 1. The laminated film constituting the winding body is provided with a mark so that the position of the pinhole can be recognized. In the winding body of the present invention, since the position of the pinhole can be recognized by the mark given to the laminated film, the size of the pinhole in the predetermined area can be measured based on the information of the mark. It can be judged whether it can be used for battery packaging material and it can be commercialized.

  The area of the pinholes present in a predetermined range of the laminated film constituting the winding body (for example, a predetermined width in the winding direction of the winding body, and the predetermined range is used for packaging of one battery) It is preferable that the laminated film be provided with different marks depending on the size. Specifically, for example, as shown in FIG. 4, by applying different marks M according to the size of the pin pole P to the end in the width direction of the position where the pinhole P of the laminated film 10 exists. , Position and size of the pinhole can be recognized. For example, in FIG. 4, in the case where one line is given as the mark M, it indicates that the area of the pinhole P is small, and in the case where the two lines are given as the mark M, It shows that the area is medium, and in the case where three lines are given as the mark M, it indicates that the area of the pinhole P is large. Although FIG. 4 shows an example in which three kinds of marks M having different sizes (total areas) of pinholes P are provided in a predetermined range R of the same winding body, the same winding body In some cases, depending on the size of the pinhole, a plurality of types of marks may be provided, or a single type of mark may be provided.

As mentioned above, the total area of pinholes that can be tolerated by an individual battery depends on the size of the battery. For example, in the case of a vehicle-mounted battery, the surface area of the battery is generally as large as about 300 to 1300 cm ² and the volume of the battery element is large, so the water content in the battery element after a predetermined period has a specified value (for example, about 500 ppm) The total area of the pinholes rising up to) is larger than the mobile device battery (the surface area of the battery is generally about 4 to 300 cm ² ) and the like. For this reason, when the battery packaging material is unrolled from the winding body and used for packaging the battery element, the above-mentioned single wire, for example, may be used as the mark M even if a portion where a pinhole is present is used. Although it can be used as a packaging material of a vehicle battery or a battery for a mobile device in the region R to which the symbol is given, it can not be used for a battery for a mobile device in the region R having a double line. It can be judged that the battery can be used. As described above, in the winding body of the present invention, since the mark is provided so that the position, preferably the size, of the pinhole can be recognized, the portion where the pinhole having a small influence on the moisture permeation is present It can be commercialized as a battery packaging material adapted to each application without removing it. For this reason, by using the battery packaging material constituting the winding body of the present invention for manufacturing the battery, it is possible to effectively suppress the moisture permeation of the battery and to suppress the manufacturing cost of the battery.

In the laminated film constituting the winding body of the present invention, the total area of the pinholes present in a given range 300～1300Cm ² is if it contains portions is about ² 2000～100000Myuemu, winding the laminated film of the predetermined range The housing can be suitably used, for example, in a car battery. The total area of the pinholes present in the predetermined range is preferably about 2000 to 80000 μm ² from the viewpoint of suppressing the manufacturing cost of the battery while further effectively suppressing the permeation of water into the in-vehicle battery. More preferably, about 2000-50000 micrometers ² are mentioned.

Further, in the laminated film constituting the winding body of the present invention, if the total area of the pinholes present in a given range 4～300Cm ² are included portions is about ² 300～2000Myuemu, lamination of the predetermined range Film The winder of the present invention can be suitably used, for example, as a battery for mobile devices. The total area of the pinholes present in the predetermined range is preferably 300 to 1500 μm ² from the viewpoint of suppressing the manufacturing cost of the battery while further effectively suppressing the permeation of water into the battery for mobile devices. The degree is more preferably about 300 to 1000 μm ² .

  In the present invention, the position and area of the pinhole in the metal layer 1 are measured using an optical pinhole inspection apparatus, and measured using an optical pinhole inspection unit C1219 manufactured by Hamamatsu Photonics Co., Ltd. Value. Further, the total area of pinholes in a predetermined range is a value obtained by inspecting the pinholes in a predetermined range using an optical pinhole inspection device and adding the areas of the pinholes included in the predetermined range. .

  In the winding body of the present invention, the length of the laminated film constituting the battery packaging material is not particularly limited, and may be, for example, 200 m or more, preferably about 200 to 4000 m. The width of the laminated film is, for example, about 0.01 to 1 m, preferably about 0.1 to 1 m. As a thickness of a lamination film, 200 micrometers or less, preferably about 50-200 micrometers, more preferably about 65-130 micrometers are mentioned, for example. In the roll-like 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 said circular cross section is about 1000 mm normally. However, the diameter of the winding cross section is the diameter when the battery packaging material is wound around a core tube made of resin, paper or the like, and the outer diameter of the core tube is usually 70 to 180 mm. It is an extent.

  The type of marks on the laminated film is not particularly limited as long as it can be recognized visually or the like, and may be, for example, a symbol such as a straight line or an identification mark in color as shown in FIG. The mark such as a symbol may be applied by applying ink or the like, or may be applied by forming an uneven shape on the surface of the layer. The mark of the laminated film may be applied to at least one layer constituting the laminated film, and can be applied to, for example, the surface of the base layer 3, the metal layer 1, and the sealant layer 2.

2. Method of Manufacturing Winding Body In the method of manufacturing a winding body of the present invention, the layers described above having a predetermined configuration are laminated, and a mark is given to the laminated film so that the position of the pinhole can be recognized. Although it is not particularly limited as long as it is possible, for example, the following method can be exemplified.

  In the method of manufacturing a winding body of the present invention, the step of manufacturing a laminated film and the position of the pinholes present in the metal layer 1 can be recognized by the laminating step of laminating the metal layer 1 and the sealant layer 2 The method further comprises the steps of: applying a mark to the laminated film; and winding the laminated film to obtain a wound body.

  In the laminating step, at least the metal layer 1 and the sealant layer 4 are laminated to obtain a laminated film. Below, in addition to these layers, the case where it has the base material layer 3 and the contact bonding layer 4 is made into an example, and a lamination process is explained in full detail. First, the base material layer 3 and the metal layer 1 are laminated. This lamination can be performed by a dry lamination method or the like using the above-mentioned adhesive component or the like which forms the adhesive layer 4. Next, the sealant layer 2 is laminated on the metal layer 1. This lamination can be performed by, for example, a dry lamination method. In order to increase the adhesive strength between the metal layer 1 and the sealant layer 2, an adhesive component for forming the adhesive layer 5 is applied onto the metal layer 1, dried, and then the sealant layer 2 is formed. Can be formed. The sealant layer 2 can be formed, for example, by melt extrusion of a thermoplastic resin. The sealant layer 2 may be formed, for example, by laminating a resin film on the metal layer 1. If necessary, a coating layer may be laminated on the surface of the substrate layer 3 opposite to the metal layer 1. The coating layer can be formed, for example, by applying the above-described two-part curable resin forming the coating layer to the surface of the base layer 3. The order of the step of laminating the metal layer 1 on the surface of the base layer 3 and the step of laminating the coating layer on the surface of the base layer 3 is not particularly limited. For example, after forming the coating layer on the surface of the base layer 3, the metal layer 1 may be formed on the surface of the base layer 3 opposite to the coating layer.

  In order to improve the adhesiveness of each layer in the obtained laminated film, an aging treatment 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, in order to further improve the adhesiveness of each layer in the obtained laminated film, the obtained laminated film may be heated at a temperature equal to or higher than the melting point of the sealant layer 2. The temperature at this time is preferably the melting point + 5 ° C. or more and the melting point + 100 ° C. or less of the sealant layer 2, and more preferably the melting point + 10 ° C. or more and the melting point + 80 ° C. or less. In the present invention, the melting point of the sealant layer refers to the endothermic peak temperature in differential scanning calorimetry of the resin component constituting the sealant layer. The heating in the aging treatment and the heating above the melting point of the sealant layer 2 can be performed by, for example, a method such as a heat roll contact method, a hot air method, a near or far infrared method, or the like.

  In the battery packaging material, each layer constituting the laminated film is, if necessary, to improve or stabilize the film forming property, lamination processing, final product secondary processing (pouche, embossing), etc. In addition, surface activation treatments such as corona treatment, blast treatment, oxidation treatment, and ozone treatment may be performed.

  In addition, in the marking step, a mark is given so that the position of the pinhole present in the metal layer 1 can be recognized. Furthermore, it is preferable to measure the size of the pinhole in the predetermined area based on the positional information of the pinhole recognized in the marking step. The position and size of the pinhole area of the metal layer 1 can be measured using an optical pinhole inspection apparatus as described above. From the viewpoint of accurately measuring the position and size of the pinhole, it is preferable to measure the position and size of the pinhole before laminating another layer on the surface of the metal layer 1. Specifically, the metal layer 1 before laminating another layer on the surface is subjected to an optical pinhole inspection, and a mark is provided (preferably also in terms of size) at the position of the pinhole present in the metal layer 1 It is preferable to do. At this time, it is possible to provide a mark directly on the surface of the metal layer 1 in combination with the pinhole inspection. For example, the position of the pinhole is recorded in the recording device, and another layer is laminated on the surface of the metal layer. After that, a mark can be provided on the surface of the laminated film, etc. based on the recording.

  As mentioned above, the pin which exists in the predetermined range (For example, it is predetermined width of the winding direction of a wind-up body, and the predetermined range is used for packing of one battery) which constitutes the wind-up body. Depending on the size of the area of the holes, it is preferable to give different marks to the laminated film. Further, as described above, since the total area of pinholes that can be tolerated by one battery differs depending on the size of the battery, depending on the application such as a vehicle battery or a battery for a mobile device, The total area can be measured to give an appropriate mark. In the method of manufacturing a winding body of the present invention, for example, when it is necessary to remove a predetermined range in which pinholes are present, for example, the total area of pinholes present in the predetermined range is too large. After cutting in the width direction, it may be connected with a tape or the like.

  Next, a winding process is performed in which the laminated film is wound to obtain a winding body. The method for winding the laminated film is not particularly limited as long as the strip-shaped laminated film is wound into a roll, and may be wound around a core tube or the like using a known film winding machine or the like.

3. Application of the winding body of the packaging material for a battery The winding body of the packaging material for a battery of the present invention unwinds the packaging material for a battery, and cuts it into an appropriate size to obtain a battery of a positive electrode, a negative electrode, an electrolytic solution, etc. It is used as a package for sealing and containing the element. That is, the battery packaging material unwound from the winding body can be deformed according to the shape of the battery element, and can be a package that accommodates the battery element.

  Specifically, the battery element including at least a positive electrode, a negative electrode, and an electrolyte is provided with a flange portion (a sealant (sealant) at the periphery of the battery element in a state in which the metal terminals connected to each of the positive electrode It is coated with a battery packaging material in such a way that an area where the layers are in contact can be formed. Next, the sealant layers in the flanges are heat sealed and sealed to provide a battery sealed with a battery packaging material (package). When accommodating a battery element using a package, it is used so that the sealant layer 2 of the packaging material for batteries may become an inner side (surface contacting a battery element).

  The battery packaging material to be unwound from the winding body of the present invention can be used for either a primary battery or a secondary battery, but it is particularly suitable to use for a secondary battery. The type of secondary battery to which the battery packaging material is applied is not particularly limited. For example, lithium ion batteries, lithium ion polymer batteries, lead storage batteries, nickel hydrogen storage batteries, nickel cadmium storage batteries, nickel, Iron storage batteries, nickel-zinc storage batteries, silver oxide-zinc storage batteries, metal air batteries, multivalent cation batteries, capacitors, capacitors and the like can be mentioned. Among these secondary batteries, lithium ion batteries and lithium ion polymer batteries can be mentioned as preferable applications of the battery packaging material to be unwound from the winding body of the present invention.

  Hereinafter, the present invention will be described in detail by way of examples. However, the present invention is not limited to the examples.

(Examples 1 to 4 and Comparative Examples 1 to 4)
[Production of Winding Body of Packaging Material for Battery]
On the base material layer 3 made of a stretched nylon film (thickness 25 μm), a metal layer 1 made of an aluminum foil (thickness 40 μm) subjected to chemical conversion treatment on both sides was laminated by a dry lamination method. Specifically, a two-part curable urethane adhesive (a polyol compound and an aromatic isocyanate compound) is applied to one surface of an aluminum foil, and an adhesive layer 4 (a metal layer 1 subjected to a pinhole inspection described later) 4 μm thick). Next, thermal lamination is performed on the adhesive layer 4 and the base layer 3 on the metal layer 1, and then an aging treatment is performed at 40 ° C. for 24 hours to obtain a laminate of base layer 3 / adhesion layer 4 / metal layer 1 Was prepared. In addition, the chemical conversion treatment of the aluminum foil used as the metal layer 1 is a roll so that the coating amount of chromium may be 10 mg / m ² (dry weight) of a treatment liquid composed of a phenol resin, a chromium fluoride compound, and phosphoric acid. It apply | coated on both surfaces of the aluminum foil by the coating method, and it carried out by baking for 20 seconds on the conditions which become the film | membrane temperature 180 degreeC or more.

  Then, the resin component (a mixed resin of an acid-modified polypropylene resin and a propylene resin) forming the sealant layer 2 on the metal layer 1 side of the laminate is extruded in a molten state (250 ° C.) to form a sealant on the metal layer 1 Layer 2 (45 μm thick) was laminated. Thus, a strip-like battery packaging material was obtained, which was a laminated film in which the base material layer 3 / the adhesive layer 4 / the metal layer 1 / the sealant layer 2 were sequentially laminated. The obtained battery packaging material had a length of 500 m and a width of 50 cm, and the battery packaging material was wound around a core tube having an outer diameter of 170 cm and a length of 60 cm to produce a wound body.

[Pinhole inspection]
The position and size of the pinhole are inspected using the optical pinhole inspection unit C1219 manufactured by Hamamatsu Photonics Co., Ltd. for the metal layer 1 used for the production of the above-mentioned battery packaging material, and the end of the position where the pinhole exists The department was marked.

[Measurement of water permeation amount]
The battery packaging material is unwound from the winding body obtained above, and cut in a predetermined area where the area of the battery surface and the area of the pinhole are the values shown in Table 1, and the battery packaging material of the predetermined area The sealant layer side is overlapped and folded in two, and the long side opposite to the folded side is heat sealed with a width of 7 mm (seal conditions: seal temperature 190 ° C., surface pressure 1.0 MPa, seal time 3.0 seconds) 3 mm It was trimmed to the width. Next, heat seal (seal conditions: seal temperature: 190 ° C., surface pressure: 2.0 MPa, seal time: 3.0 seconds) of 10 mm width on one of the two sides on both sides of the folded side to form pouches; After pouring the amount of electrolyte solution (ethylene carbonate: diethyl carbonate: dimethyl carbonate = 1: 1: 1, water content substantially 0 ppm) into the inside of the pouch, heat seal the remaining short side open 10 mm wide (Sealing conditions: sealing temperature: 190 ° C., surface pressure: 2.0 MPa, sealing time: 3.0 seconds) to prepare an enclosed body (bag). Next, the pouch was stored for 30 days in an environment of 90% humidity and 60 ° C., and then the amount of water contained in the electrolytic solution was measured by the Karl Fischer method. What evaluated each sample is shown in Table 1.

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

Claims (12)

A winding body of a battery packaging material comprising a laminated film in which at least a metal layer and a sealant layer are laminated in this order,
There are pinholes in the metal layer,
A wound body of a packaging material for a battery, wherein a mark is provided on the laminated film so that the position of the pinhole can be recognized.   The winding body of the packaging material for a battery according to claim 1, wherein the laminated film is provided with different marks according to a size of a total area of the pinholes present in a predetermined range of the laminated film. The predetermined range of the laminated film is 300 to 1300 cm ² ,
The winding body of the packaging material for a battery according to claim ² , wherein the total area of pinholes present in the predetermined range includes a portion having 2000 to 100000 μm ² . The predetermined range of the laminated film is 4 to 300 cm ² ,
The winding body of the packaging material for a battery according to claim ² , wherein the total area of the pinholes present in the predetermined range includes a portion having 300 to 2000 μm ² .   The windup body of the packaging material for batteries in any one of Claims 1-4 whose thickness of the said metal layer is 50 micrometers or less.   The winding body of the packaging material for a battery according to any one of claims 1 to 5, wherein the winding body is a roll having a length of 200 m or more and a circular cross section having a diameter of 150 mm or more. It is a manufacturing method of the winding body of the packaging material for batteries in any one of Claims 1-6,
Manufacturing a laminated film by at least laminating a metal layer and a sealant layer;
A marking process for applying a mark to the laminated film so that the position of the pinhole present in the metal layer can be recognized;
A winding step of winding the laminated film to obtain a winding body;
The manufacturing method of the winding body of the packaging material for batteries provided with these.   The winding of the packaging material for a battery according to claim 7, wherein, in the marking step, different marks are given to the laminated film in accordance with a size of a total area of the pinholes present in a predetermined range of the laminated film. How to make the carrier. The predetermined range of the laminated film is 300 to 1300 cm ² ,
The manufacturing method of the winding body of the packaging material for batteries of Claim 8 whose sum total area of the pinhole which exists in the said predetermined range is 2000-100000 (micrometer < ² >). The predetermined range of the laminated film is 4 to 300 cm ² ,
The total area of pinholes existing in the predetermined range, a 300～2000Myuemu ^2, the manufacturing method of the winding body for a battery packaging material of claim 8.   The manufacturing method of the winding body of the packaging material for batteries in any one of Claims 7-10 whose thickness of the said metal layer is 50 micrometers or less.   The said winding body is a roll shape whose length of the said laminated | multilayer film is 200 m or more, and the diameter of a circular cross section is 180 mm or more, manufacture of the winding body of the battery packaging material in any one of Claims 7-11. Method.