JP2017069043A - Battery-packaging material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a battery-packaging material superior in the easiness of identification and large in surface resistance value; and a method for manufacturing such a battery-packaging material.SOLUTION: A battery-packaging material comprises a laminate having at least, a base material layer 1, a metal layer 3 and a sealant layer 4 in this order. Of the laminate, an outermost layer on the side of the base material layer 1 makes an identification layer 6 which is formed from a resin composition including a conductive pigment and an insulating pigment. A method for manufacturing a battery-packaging material comprises: a lamination step for obtaining a laminate having at least a base material layer 1, a metal layer 3 and a sealant layer 4 in this order. In the lamination step, an identification layer 6 formed from a resin composition including a conductive pigment and an insulating pigment is laminated on the side of the base material layer 1 as an outermost layer of the laminate.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging material for a battery that is excellent in distinguishability and has a large surface resistance value.

  Conventionally, various types of batteries have been developed. In any battery, a packaging material is an indispensable member for sealing battery elements such as electrodes and electrolytes. Conventionally, metal packaging materials have been widely used as battery packaging, but in recent years, with the increasing performance of electric vehicles, hybrid electric vehicles, personal computers, cameras, mobile phones, etc., batteries are required to have various shapes. At the same time, there is a demand for reduction in thickness and weight. However, metal battery packaging materials that have been widely used in the past have the disadvantages that it is difficult to follow the diversification of shapes and that there is a limit to weight reduction.

  Therefore, a film-like laminate in which a base material layer / adhesive layer / metal layer / sealant layer are sequentially laminated is proposed as a battery packaging material that can be easily processed into various shapes and can be made thinner and lighter. (For example, refer to Patent Document 1). Such a film-shaped battery packaging material is formed so that the battery element can be sealed by causing the sealant layers to face each other and heat-sealing the peripheral portion by heat sealing.

  In various packaging materials formed by the laminates as described above, the battery packaging material is colored with a pigment or the like to impart discrimination to the battery.

JP 2008-287971 A

Carbon black is widely used as a pigment for coloring battery packaging materials because it can impart high discrimination. However, in recent years, with the demand for smaller and thinner batteries, there has been a demand for further thinner film packaging materials for batteries. As a result of investigations by the present inventors, it has been found that when the battery packaging material is colored with carbon black, the surface resistance value is lowered and the insulation of the battery packaging material is lowered. In particular, when the thickness of the battery packaging material becomes very thin (for example, the total thickness is 100 μm or less), it has been found that the decrease in insulation of the battery packaging material due to the decrease in the surface resistance value becomes a serious problem. .
Under such circumstances, a main object of the present invention is to provide a battery packaging material that has excellent discrimination and a large surface resistance value. Furthermore, this invention also aims at providing the manufacturing method of the said packaging material for batteries, and the battery using the said packaging material for batteries.

  The present inventors have intensively studied to solve the above problems. As a result, at least a base material layer, a metal layer, and a sealant layer are sequentially laminated, and the outermost layer on the base material layer side of the laminate includes a conductive pigment and an insulating pigment. It has been found that by constituting an identification layer formed of a product, the battery packaging material is excellent in discrimination and has a large surface resistance value. It was very surprising that such knowledge was obtained. That is, since the resin constituting the identification layer has an insulating property, it is assumed that the surface resistance value of the identification layer hardly changes even if an insulating pigment is added in addition to the conductive pigment. . However, as a result of investigations by the present inventors, unexpectedly, by using a conductive pigment and an insulating pigment in combination, a battery packaging material having a high surface resistance value while having high discrimination can be obtained. It was. The present invention has been completed by further studies based on these findings.

That is, this invention provides the invention of the aspect hung up below.
Item 1. It consists of a laminate having at least a base material layer, a metal layer, and a sealant layer in this order,
The battery packaging material, wherein the outermost layer on the substrate layer side of the laminate comprises an identification layer formed of a resin composition containing a conductive pigment and an insulating pigment.
Item 2. Item 2. The battery packaging material according to Item 1, wherein the identification layer is provided outside the base material layer.
Item 3. Item 2. The battery packaging material according to Item 1, wherein the base material layer constitutes the identification layer.
Item 4. Item 4. The battery packaging material according to any one of Items 1 to 3, wherein the identification layer further contains a filler.
Item 5. Item 5. The battery packaging material according to any one of Items 1 to 4, wherein the conductive fine particles are carbon black.
Item 6. Item 6. The battery packaging material according to any one of Items 1 to 5, wherein the laminate has a thickness of 100 μm or less.
Item 7. Item 7. The battery packaging material according to any one of Items 1 to 6, wherein the base material layer is formed of at least one of a polyamide resin and a polyester resin.
Item 8. Item 8. The battery packaging material according to any one of Items 1 to 7, which has an adhesive layer between the base material layer and the metal layer.
Item 9. Item 9. The battery packaging material according to any one of Items 1 to 8, wherein the metal layer is formed of an aluminum foil.
Item 10. Item 10. A battery in which a battery element including at least a positive electrode, a negative electrode, and an electrolyte is accommodated in the battery packaging material according to any one of Items 1 to 9.
Item 11. At least a layering step for obtaining a laminate having a base material layer, a metal layer, and a sealant layer in this order;
In the stacking step, a battery packaging material manufacturing method in which an identification layer formed of a resin composition containing a conductive pigment and an insulating pigment is stacked as the outermost layer on the substrate layer side of the stacked body.
Item 12. Item 12. The method for manufacturing a packaging material for a battery according to Item 11, comprising a step of laminating the identification layer on the outside of the base material layer in the laminating step.
Item 13. Item 12. The method for producing a packaging material for a battery according to Item 11, comprising a step of laminating the base material layer as the identification layer in the laminating step.

  According to the present invention, the laminate includes at least a base material layer, a metal layer, and a sealant layer in this order, and the outermost layer on the base material layer side of the laminate includes a conductive pigment and an insulating pigment. Since the discriminating layer formed of the resin composition is constituted, it is possible to provide a battery packaging material that is excellent in discriminating property and has a large surface resistance value. Furthermore, according to this invention, the manufacturing method of the battery using the said packaging material for batteries and the said packaging material for batteries can also be provided.

It is a figure which shows an example of the cross-section of the packaging material for batteries of this invention. It is a figure which shows an example of the cross-section of the packaging material for batteries of this invention. It is a figure which shows an example of the cross-section of the packaging material for batteries of this invention. It is a figure which shows an example of the cross-section of the packaging material for batteries of this invention.

  The battery packaging material of the present invention comprises a laminate having at least a base material layer, a metal layer, and a sealant layer in this order, and the outermost layer on the base material layer side of the laminate is an electrically conductive pigment and an insulating material. The discriminating layer is formed of a resin composition containing a pigment. Hereinafter, the battery packaging material of the present invention, the method for producing the battery packaging material, and the battery using the battery packaging material will be described in detail.

1. Laminated structure of battery packaging material When the battery packaging material of the present invention is applied to a battery, the base material layer 1 is the outermost layer side, and the sealant layer 4 is the innermost layer. In other words, when the battery is assembled, the battery element is sealed by thermally welding the sealant layers 4 positioned on the periphery of the battery element to seal the battery element.

  As shown in FIG. 1, the battery packaging material is composed of a laminate having at least a base material layer 1, a metal layer 3, and a sealant layer 4 in this order. In the battery packaging material of the present invention, the outermost layer on the base material layer 1 side of the laminate constitutes an identification layer 6 formed of a resin composition containing a conductive pigment and an insulating pigment. In the battery packaging material of the present invention, for example, as shown in FIGS. 1 and 2, an identification layer 6 may be provided outside the base material layer 1. Moreover, as shown in FIGS. 3 and 4, the base material layer 1 located in the outermost layer may constitute the identification layer 6.

  Moreover, as shown in FIGS. 1-4, between the base material layer 1 and the metal layer 3, the adhesive layer 2 may be provided as needed for the purpose of improving these adhesiveness. As shown in FIGS. 3 and 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.

  The thickness of the laminate constituting the battery packaging material of the present invention is not particularly limited, and the battery packaging material having excellent discrimination and a large surface resistance value while increasing the energy density of the battery by reducing the thickness. From the viewpoint of, it is preferably 100 μm or less, more preferably about 60 to 100 μm. Even when the thickness of the laminate constituting the battery packaging material of the present invention is very thin, for example, 100 μm or less, according to the present invention, the battery packaging material has excellent discrimination and a large surface resistance value. Can do.

The surface resistance value of the battery packaging material of the present invention is preferably 1.8 × 10 ¹⁴ Ω or more, more preferably 2.0 × 10 ¹⁴ Ω or more, and further preferably 5.0 × 10 ¹⁴ Ω or more. It is done. In addition, the measuring method of the surface resistance value of the packaging material for batteries is a value obtained by measuring using a surface resistance measuring device under conditions of an applied voltage of 1000 V and an application time of 1 minute.

2. Composition of each layer forming battery packaging material [identification layer 6]
In this invention, the identification layer 6 is located in the outermost layer of the packaging material for batteries, and is a layer provided in order to improve the identification of a battery. As described above, for example, as shown in FIGS. 1 and 2, the identification layer 6 may be located outside the base material layer 1, or the base material layer 1 located in the outermost layer constitutes the identification layer 6. You may do it.

  The identification layer 6 is formed of a resin composition containing a conductive pigment and an insulating pigment. Although it does not restrict | limit especially as a kind of electroconductive pigment, From a viewpoint of providing the outstanding discriminability by using together with the below-mentioned insulating pigment, Preferably carbon black, brass powder, etc. are mentioned. A conductive pigment may be used individually by 1 type, and may be used in combination of 2 or more types.

  The proportion of the conductive pigment contained in the identification layer 6 is preferably 0.1 from the viewpoint of providing a battery packaging material having excellent discrimination and a large surface resistance value when used in combination with an insulating pigment described later. About 10.0 mass%, More preferably, it is about 0.1-8.0 mass%, More preferably, about 0.1-5.0 mass% is mentioned.

  The type of insulating pigment is not particularly limited, but from the viewpoint of battery packaging material having excellent discrimination and a large surface resistance value when used in combination with the conductive pigment described above, titanium oxide pigments and cadmium. Pigments, lead pigments, chromium oxide pigments, inorganic pigments such as mica and fish scales, azo, phthalocyanine, quinacridone, anthraquinone, dioxane, indigothioindigo, perinone-perylene, isoindolenine And organic pigments such as those based on the above. Among these pigments, by using an inorganic pigment such as a titanium oxide-based pigment, the identification layer 6 becomes hard and the scratch resistance of the battery packaging material can be increased. An insulating pigment may be used individually by 1 type, and may be used in combination of 2 or more types.

  The proportion of the insulating pigment contained in the identification layer 6 is preferably 10 to 40 from the viewpoint of providing a battery packaging material having excellent discrimination and a large surface resistance value when used in combination with the conductive pigment described above. About mass%, More preferably, about 15-40 mass%, More preferably, about 20-40 mass% is mentioned.

  As a blending ratio of the conductive pigment and the insulating pigment in the identification layer 6 (conductive pigment: insulating pigment), by using these pigments together, the packaging material for batteries having excellent discrimination and a large surface resistance value is used. From the point of view, it is preferably about 1:10 to 1: 200, more preferably about 1:15 to 1: 180, and still more preferably about 1:20 to 1: 160.

  The identification layer 6 preferably further contains a filler in addition to the conductive pigment and the insulating pigment. By including the filler in the identification layer 6 constituting the outermost layer, the slidability of the surface of the battery packaging material can be improved, and the moldability can be improved. When the identification layer 6 located at the outermost layer contains a conductive pigment and an insulating pigment, the type of pigment affects the moldability of the battery packaging material, and depending on the type and content of the pigment, the packaging for the battery It is conceivable that the formability of the material is lowered. On the other hand, when the identification layer 6 further contains a filler in addition to the conductive pigment and the insulating pigment, the moldability of the battery packaging material can be effectively enhanced.

  Although it does not restrict | limit especially as a kind of filler, From a viewpoint which improves the moldability of the packaging material for batteries effectively by including with a conductive pigment and an insulating pigment in the identification layer 6, Preferably it is a silica (colloidal). Silica, fumed silica, precipitated silica, etc.), talc, kaolin, montmorilloid, montmorillonite, synthetic mica, hydrotalcite, silica gel, zeolite, aluminum hydroxide, magnesium hydroxide, zinc oxide, magnesium oxide, aluminum oxide, oxidation Neodymium, antimony oxide, cerium oxide, calcium sulfate, barium sulfate, calcium carbonate, calcium silicate, lithium carbonate, calcium benzoate, calcium oxalate, magnesium stearate, alumina, high melting point nylon, crosslinked acrylic, crosslinked styrene XLPE, benzoguanamine resin beads, and inorganic particles such as colored resin beads. Among these, silica is preferable. The shape of the filler is not particularly limited, and examples thereof include a spherical shape, a fiber shape, a plate shape, an indeterminate shape, and a balloon shape. A filler may be used individually by 1 type and may be used in combination of 2 or more types.

  The resin contained in the resin composition forming the identification layer 6 is not particularly limited, and examples thereof include thermoplastic resins, thermosetting resins, and ionizing radiation curable resins. Among these, thermosetting resins are preferable from the viewpoint that the identification layer 6 includes the above-described conductive pigment and insulating pigment to provide a battery packaging material having excellent identification and a large surface resistance.

  The thermoplastic resin is not particularly limited, and acrylic resins such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; polyolefin resins such as polypropylene and polyethylene; polycarbonate resins; vinyl chloride resins; acrylonitrile-butadiene-styrene resins (ABS resin); acrylonitrile-styrene-acrylic ester resin, nitrified cotton resin, etc. are mentioned.

  The ionizing radiation curable resin is a resin that crosslinks and cures when irradiated with ionizing radiation. Specifically, the polymer has a polymerizable unsaturated bond or an epoxy group, a prepolymer, an oligomer, And those obtained by appropriately mixing at least one of monomers and the like. Here, ionizing radiation means an electromagnetic wave or charged particle beam having an energy quantum capable of polymerizing or cross-linking molecules, and usually ultraviolet (UV) or electron beam (EB) is used. It also includes electromagnetic waves such as rays and γ rays, and charged particle rays such as α rays and ion rays. A well-known thing can be used as ionizing radiation-curable resin.

  As the monomer used as the ionizing radiation curable resin, a (meth) acrylate monomer having a radically polymerizable unsaturated group in the molecule is suitable, and a polyfunctional (meth) acrylate monomer is particularly preferable. The polyfunctional (meth) acrylate monomer may be a (meth) acrylate monomer having two or more polymerizable unsaturated bonds (bifunctional or more), preferably three or more (trifunctional or more) in the molecule. Specific examples of the polyfunctional (meth) acrylate include ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, and 1,6-hexanediol di ( (Meth) acrylate, neopentyl glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, hydroxypivalate neopentyl glycol di (meth) acrylate, dicyclopentanyl di (meth) acrylate, caprolactone modified dicyclopentenyl di ( (Meth) acrylate, ethylene oxide-modified phosphoric acid di (meth) acrylate, allylated cyclohexyl di (meth) acrylate, isocyanurate di (meth) acrylate, trimethylolpropane tri (meth) acrylate , Ethylene oxide modified trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylate, propylene oxide modified trimethylolpropane tri ( (Meth) acrylate, tris (acryloxyethyl) isocyanurate, propionic acid modified dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, ethylene oxide modified dipentaerythritol hexa (meth) acrylate, caprolactone modified dipentaerythritol Examples include hexa (meth) acrylate. These monomers may be used individually by 1 type, and may be used in combination of 2 or more type.

  The oligomer used as the ionizing radiation curable resin is preferably a (meth) acrylate oligomer having a radical polymerizable unsaturated group in the molecule, and more than two polymerizable unsaturated bonds in the molecule. A polyfunctional (meth) acrylate oligomer having (bifunctional or higher) is preferred. Examples of the polyfunctional (meth) acrylate oligomer include polycarbonate (meth) acrylate, acrylic silicone (meth) acrylate, urethane (meth) acrylate, epoxy (meth) acrylate, polyester (meth) acrylate, and polyether (meth) acrylate. , Polybutadiene (meth) acrylate, silicone (meth) acrylate, oligomer having a cationic polymerizable functional group in the molecule (for example, novolac type epoxy resin, bisphenol type epoxy resin, aliphatic vinyl ether, aromatic vinyl ether, etc.) . Here, the polycarbonate (meth) acrylate is not particularly limited as long as it has a carbonate bond in the polymer main chain and a (meth) acrylate group in the terminal or side chain. It can be obtained by esterification with acrylic acid. The polycarbonate (meth) acrylate may be, for example, a polycarbonate urethane (meth) acrylate which is a urethane (meth) acrylate having a polycarbonate skeleton. The urethane (meth) acrylate having a polycarbonate skeleton can be obtained, for example, by reacting a polycarbonate polyol, a polyvalent isocyanate compound, and hydroxy (meth) acrylate. The acrylic silicone (meth) acrylate can be obtained by radical copolymerizing a silicone macromonomer with a (meth) acrylate monomer. Urethane (meth) acrylate can be obtained, for example, by esterifying a polyurethane oligomer obtained by the reaction of a polyisocyanate compound with a polyether polyol, a polyester polyol, a caprolactone-based polyol or a polycarbonate polyol with (meth) acrylic acid. it can. Epoxy (meth) acrylate can be obtained, for example, by reacting (meth) acrylic acid with an oxirane ring of a relatively low molecular weight bisphenol type epoxy resin or novolak type epoxy resin and esterifying it. Also, a carboxyl-modified epoxy (meth) acrylate obtained by partially modifying this epoxy (meth) acrylate with a dibasic carboxylic acid anhydride can be used. Polyester (meth) acrylate is obtained by esterifying the hydroxyl group of a polyester oligomer having hydroxyl groups at both ends obtained by condensation of a polyvalent carboxylic acid and a polyhydric alcohol with (meth) acrylic acid, for example, or It can be obtained by esterifying the terminal hydroxyl group of an oligomer obtained by adding an alkylene oxide with (meth) acrylic acid. The polyether (meth) acrylate can be obtained by esterifying the hydroxyl group of the polyether polyol with (meth) acrylic acid. Polybutadiene (meth) acrylate can be obtained by adding (meth) acrylic acid to the side chain of the polybutadiene oligomer. Silicone (meth) acrylate can be obtained by adding (meth) acrylic acid to the terminal or side chain of silicone having a polysiloxane bond in the main chain. Among these, as the polyfunctional (meth) acrylate oligomer, polycarbonate (meth) acrylate, urethane (meth) acrylate, and the like are particularly preferable. These oligomers may be used individually by 1 type, and may be used in combination of 2 or more type.

  The thermosetting resin is not particularly limited. For example, urethane resin, epoxy resin, phenol resin, urea resin, unsaturated polyester resin, melamine resin, alkyd resin, polyimide resin, silicone resin, hydroxyl functional acrylic resin, carboxyl Examples thereof include functional acrylic resins and amide functional copolymers. Among these, urethane resins are preferable.

  As the urethane resin, polyurethane having a polyol (polyhydric alcohol) as a main ingredient and an isocyanate as a crosslinking agent (curing agent) can be used. The polyol may be any compound having two or more hydroxyl groups in the molecule, and specific examples include polyester polyol, polyethylene glycol, polypropylene glycol, acrylic polyol, polyether polyol and the like. Specific examples of the isocyanate include polyvalent isocyanate having two or more isocyanate groups in the molecule; aromatic isocyanate such as 4,4-diphenylmethane diisocyanate; hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogen Aliphatic (or alicyclic) isocyanates such as added diphenylmethane diisocyanate can be mentioned.

  Moreover, when the below-mentioned base material layer 1 comprises the identification layer 6, the above-mentioned conductive pigment and insulating pigment in the resin which comprises the base material layer 1, and the filler mix | blended as needed are included. included.

  The ratio of the resin in the identification layer 6 is preferably about 40 to 70% by mass, more preferably about 45 to 70% by mass, and more preferably about 45 to 70% by mass, from the viewpoint of providing a battery packaging material with excellent discrimination and a large surface resistance value. Preferably about 50-65 mass% is mentioned.

  The thickness of the identification layer 6 is not particularly limited, but it is preferably 10 μm or less from the viewpoint of making the battery packaging material excellent in identification and having a large surface resistance value while increasing the energy density of the battery by reducing the thickness. More preferably, about 0.5-6 micrometers is mentioned, More preferably, about 0.5-4 micrometers is mentioned. In addition, when the below-mentioned base material layer 1 comprises the identification layer 6, the thickness of the identification layer 6 becomes the thickness of the below-mentioned base material layer 1.

[Base material layer 1]
In the battery packaging material of the present invention, the base material layer 1 is positioned outside the metal layer 3 and functions as a support for the battery packaging material. The material for forming the base material layer 1 is not particularly limited as long as it has insulating properties.

  As described above, when the base material layer 1 is located in the outermost layer, the base material layer 1 constitutes the identification layer 6. In this case, the base material layer 1 becomes the identification layer 6 formed of a resin composition containing a conductive pigment and an insulating pigment. That is, the conductive pigment and insulating pigment described above in the resin constituting the base material layer 1 and a filler blended as necessary are included. Also when the base material layer 1 comprises the identification layer 6, the kind of each component except resin, content, etc. are the same as the description of the item of the above-mentioned [identification layer 6].

  Examples of the resin forming the base material layer 1 include polyester, polyamide, epoxy resin, acrylic resin, fluorine resin, polyurethane, silicon resin, phenol resin, polyetherimide, polyimide, and mixtures and copolymers thereof. Can be mentioned.

  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. Moreover, the base material layer 1 may be formed by coating the above-mentioned raw material on the metal layer 3.

  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 at least one of resin films and coatings 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 silicone resins can be used.

  As thickness of the base material layer 1, about 10-50 micrometers is mentioned, for example, Preferably about 12-30 micrometers is mentioned.

[Adhesive layer 2]
In the battery packaging material of the present invention, the adhesive layer 2 is a layer provided as necessary in order to adhere 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, about 1-10 micrometers is mentioned, for example, Preferably about 2-8 micrometers is mentioned.

[Metal layer 3]
In the battery packaging material of the present invention, the metal layer 3 is a layer that functions as a barrier layer for preventing the penetration of water vapor, oxygen, light, etc. into the battery, in addition to improving the strength of the packaging material. Specific examples of the metal forming the metal layer 3 include metal foils such as aluminum, stainless steel, and titanium. Among these, aluminum is preferably used. In order to prevent wrinkles and pinholes during the production of the packaging material, soft aluminum such as annealed aluminum (JIS A8021P-O) or (JIS A8079P-O) is used as the metal layer 3 in the present invention. Is preferred.

  About the thickness of the metal layer 3, about 10-50 micrometers is mentioned, for example, Preferably about 15-35 micrometers is mentioned.

  Further, the metal layer 3 is preferably subjected to chemical conversion treatment on at least one surface, preferably at least the surface on the sealant layer 4 side, and more preferably both surfaces, for the purpose of stabilizing adhesion, preventing dissolution and corrosion, and the like. . Here, the chemical conversion treatment is a treatment for forming an acid-resistant film on the surface of the metal layer 3. Chemical conversion treatment is, for example, chromate chromate treatment using a chromic acid compound such as chromium nitrate, chromium fluoride, chromium sulfate, chromium acetate, chromium oxalate, chromium biphosphate, chromic acetyl acetate, chromium chloride, potassium sulfate chromium, etc. ; Phosphoric acid chromate treatment using phosphoric acid compounds such as sodium phosphate, potassium phosphate, ammonium phosphate, polyphosphoric acid; aminated phenol heavy consisting of repeating units represented by the following general formulas (1) to (4) Examples thereof include chromate treatment using a coalescence. In the aminated phenol polymer, the repeating units represented by the following general formulas (1) to (4) may be included singly or in any combination of two or more. Also good.

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 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, 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- A linear or branched chain having 1 to 4 carbon atoms substituted with one hydroxy group such as hydroxypropyl group, 1-hydroxybutyl group, 2-hydroxybutyl group, 3-hydroxybutyl group, 4-hydroxybutyl group An alkyl group is mentioned. In the general formulas (1) to (4), X is preferably any one of a hydrogen atom, a hydroxyl group, and a droxyalkyl group. The number average molecular weight of the aminated phenol polymer composed of the repeating units represented by the general formulas (1) to (4) is, for example, about 500 to about 1,000,000, preferably about 1000 to about 20,000.

  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. Moreover, you may form the resin layer which crosslinked the cationic polymer with the crosslinking agent on the corrosion-resistant process layer. Here, as the cationic polymer, for example, polyethyleneimine, an ionic polymer complex composed of a polymer having polyethyleneimine and a carboxylic acid, a primary amine-grafted acrylic resin in which a primary amine is grafted on an acrylic main skeleton, polyallylamine, or Examples thereof include aminophenols and derivatives thereof. These cationic polymers may be used individually by 1 type, and may be used in combination of 2 or more type. Examples of the crosslinking agent include compounds having at least one functional group selected from the group consisting of isocyanate groups, glycidyl groups, carboxyl groups, and oxazoline groups, silane coupling agents, and the like. These crosslinking agents may be used alone or in combination of two or more.

  These chemical conversion treatments may be performed alone or in combination of two or more chemical conversion treatments. 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 these, chromic acid chromate treatment is preferable, and chromate treatment in which a chromic acid compound, a phosphoric acid compound, and an aminated phenol polymer are combined is more 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 chromate treatment is performed by combining a chromic acid compound, a phosphoric acid compound, and an aminated phenol polymer. The chromic acid compound is about 0.5 to about 50 mg, preferably about 1.0 to about 40 mg in terms of chromium, and the phosphorus compound is about 0.5 to about 50 mg in terms of phosphorus per 1 m ² of the surface of the metal layer 3. Is preferably about 1.0 to about 40 mg, and about 1 to about 200 mg, preferably about 5.0 to 150 mg of aminated phenol polymer.

  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 3 by a bar coating method, a roll coating method, a gravure coating method, a dipping method or the like, and then the temperature of the metal layer 3 is reached. Is performed by heating so as to be about 70 to 200 ° C. In addition, before the chemical conversion treatment is performed on the metal layer 3, the metal layer 3 may be 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 in advance. 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 3.

[Sealant layer 4]
In the battery packaging material of the present invention, the sealant layer 4 corresponds to the innermost layer, and is a layer that seals the battery element by heat-sealing the sealant layers when the battery is assembled.

  The resin component used for the sealant layer 4 is not particularly limited as long as it can be thermally welded, and examples thereof include polyolefin, cyclic polyolefin, carboxylic acid-modified polyolefin, and carboxylic acid-modified cyclic polyolefin.

  Specific examples of the polyolefin include polyethylene such as low density polyethylene, medium density polyethylene, high density polyethylene, and linear low density polyethylene; homopolypropylene, polypropylene block copolymer (for example, block copolymer of propylene and ethylene), polypropylene And a random copolymer (for example, a random copolymer of propylene and ethylene); an ethylene-butene-propylene terpolymer; and the like. Among these polyolefins, polyethylene and polypropylene are preferable.

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

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

  Among these resin components, carboxylic acid-modified polyolefin is preferable; carboxylic acid-modified polypropylene is more preferable.

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

  In addition, the thickness of the sealant layer 4 can be selected as appropriate, and is about 10 to 60 μm, preferably about 15 to 45 μm.

[Adhesive layer 5]
In the battery packaging material of the present invention, the adhesive layer 5 is a layer provided between the metal layer 3 and the sealant layer 4 as necessary in order to firmly bond the metal layer 3 and the sealant layer 4.

  The adhesive layer 5 is formed of an adhesive capable of bonding the metal layer 3 and the sealant layer 4. With respect to the adhesive used for forming the adhesive layer 5, the adhesive mechanism, the types of adhesive components, and the like are the same as those of the adhesive layer 2. The adhesive component used for the adhesive layer 5 is preferably a polyolefin resin, more preferably a carboxylic acid-modified polyolefin, particularly preferably a carboxylic acid-modified polypropylene.

  About the thickness of the contact bonding layer 5, 2-50 micrometers, for example, Preferably 15-30 micrometers is mentioned.

3. Production method of battery packaging material The production method of the battery packaging material of the present invention is not particularly limited as long as a laminate in which layers of a predetermined composition are laminated is obtained, and at least a base material layer and a metal layer And a laminate step for obtaining a laminate in which the sealant layer is sequentially laminated. In the lamination step, as the outermost layer on the base material layer side of the laminate, a resin composition containing a conductive pigment and an insulating pigment is used. The method of laminating | stacking the formed identification layer is mentioned.

  The following method is mentioned as a specific example of the manufacturing method of the packaging material for batteries of this invention. First, a laminate having the base material layer 1, the adhesive layer 2, and the metal layer 3 in this order (hereinafter also referred to as “laminate A”) is formed. Specifically, the laminate A is formed by extruding an adhesive used for forming the adhesive layer 2 on the base layer 1 or the metal layer 3 whose surface is subjected to chemical conversion treatment, if necessary. It can be performed by a dry lamination method in which the metal layer 3 or the base material layer 1 is laminated and the adhesive layer 2 is cured after being applied and dried by a coating method such as a method or a roll coating method. When the identification layer 6 is laminated on the outside of the base material layer 1, the identification layer 6 may be laminated on the surface of the base material layer 1 before the base material layer 1 and the metal layer 3 are laminated. The layer 1 and the metal layer 3 may be laminated and then laminated on the surface of the base material layer 1. The identification layer 6 may be laminated on the surface of the base material layer 1 after the sealant layer 4 is formed. Further, the base material layer 1 may be laminated as the identification layer 6.

  Next, the sealant layer 4 is laminated on the metal layer 3 of the laminate A. When the sealant layer 4 is directly laminated on the metal layer 3, the resin component constituting the sealant layer 4 may be applied on the metal layer 3 of the laminate A by a method such as a gravure coating method or a roll coating method. . In the case where the adhesive layer 5 is provided between the metal layer 3 and the sealant layer 4, for example, (1) the adhesive layer 5 and the sealant layer 4 are laminated on the metal layer 3 of the laminate A by coextrusion. (2) A method of separately forming a laminate in which the adhesive layer 5 and the sealant layer 4 are laminated, and laminating the laminate on the metal layer 3 of the laminate A by a thermal lamination method, 3) An adhesive for forming the adhesive layer 5 is laminated on the metal layer 3 of the laminate A by an extrusion method or a solution-coated high temperature drying and baking method, and a sheet-like shape is formed on the adhesive layer 5 in advance. (4) A melted adhesive layer 5 is placed between the metal layer 3 of the laminate A and the sealant layer 4 previously formed into a sheet shape. Adhesive layer 5 while pouring Method (sand lamination method) and the like to bond the laminate A and the sealant layer 4. In addition, in order to strengthen the adhesiveness of the adhesive layer 2 and the adhesive layer 5 provided as necessary, it may be further subjected to a heat treatment such as a hot roll contact type, a hot air type, a near or far infrared type. Examples of such heat treatment conditions include 150 to 250 ° C. for 1 to 5 minutes.

  In the battery packaging material of the present invention, each layer constituting the laminate improves or stabilizes film forming properties, lamination processing, suitability for final processing (pouching, embossing), etc., as necessary. Therefore, surface activation treatment such as corona treatment, plasma treatment, flame treatment, ionizing radiation irradiation treatment, blast treatment, oxidation treatment, ozone treatment, and UV ozone treatment may be performed.

  Furthermore, in the method for manufacturing a battery packaging material of the present invention, the surface of the base material layer 1 may be subjected to corona treatment to improve the surface tension of the base material layer 1.

4). Application of Battery Packaging Material The battery packaging material of the present invention is used as a packaging material for sealing and housing battery elements such as a positive electrode, a negative electrode, and an electrolyte.

  Specifically, a battery element including at least a positive electrode, a negative electrode, and an electrolyte is formed using the battery packaging material of the present invention, with the metal terminals connected to each of the positive electrode and the negative electrode protruding outward. A battery using a battery packaging material is formed by covering the periphery of the element so that a flange portion (a region where the sealant layers are in contact with each other) can be formed, and heat-sealing and sealing the sealant layers of the flange portion. Provided. In addition, when accommodating a battery element using the battery packaging material of the present invention, the battery packaging material of the present invention is used such that the sealant portion is on the inner side (surface in contact with the battery element).

  Since the battery packaging material of the present invention is used in the battery of the present invention, the battery packaging material is molded and the battery element is sealed, and the battery has excellent discrimination and a high surface. A resistance value can be provided.

  The battery packaging material of the present invention may be used for either a primary battery or a secondary battery, but is preferably a secondary battery. The type of secondary battery to which the battery packaging material of the present invention is applied is not particularly limited. For example, a lithium ion battery, a lithium ion polymer battery, a lead battery, a nickel / hydrogen battery, a nickel / cadmium battery , Nickel / iron livestock batteries, nickel / zinc livestock batteries, silver oxide / zinc livestock batteries, metal-air batteries, polyvalent cation batteries, capacitors, capacitors and the like. Among these secondary batteries, lithium ion batteries and lithium ion polymer batteries are suitable applications for the battery packaging material of the present invention.

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

<Manufacture of battery packaging materials>
Examples 1-6 and Comparative Examples 1-2
Chemical conversion treatment is performed on both sides of an aluminum foil (thickness 35 μm) as a metal layer, and a stretched nylon film (thickness 15 μm) is applied to one chemical conversion treatment surface via a polyester adhesive so that the thickness of the adhesive layer is about 3 μm. And bonded together by a dry laminating method. Next, two layers of acid-modified polypropylene (thickness 20 μm, hereinafter abbreviated as acid-modified PP) and polypropylene (thickness 15 μm, hereinafter abbreviated as PP) were coextruded and laminated on the other chemical conversion treatment surface. Thus, a laminate composed of stretched nylon film / adhesive layer / aluminum foil / acid-modified PP / PP was obtained. In each of the chemical conversion treatments, an aqueous solution composed of a phenol resin, a chromium fluoride compound, and phosphoric acid was used as a treatment solution, applied by a roll coating method, and baked under conditions where the film temperature was 180 ° C. or higher. Here, the coating amount of chromium was 10 mg / m ² (dry weight). On the upper surface of the base material layer of the battery packaging material, a resin composition containing a conductive pigment, an insulating pigment, and a filler described in Table 1 is applied at a coating amount of 2.5 g / m ² , and aging is performed at 40 ° C. This was carried out for 2 days, and the resin composition was cured to obtain a battery packaging material in which an identification layer was formed on the surface of the base material layer. The resin contained in the resin composition forming the identification layer is a urethane resin composed of a polyol compound and an isocyanate compound.

Comparative Example 3
A battery packaging material was obtained in the same manner as in Comparative Example 2 except that carbon black was added in a solid content of 10% by weight to the polyester adhesive.

<Measurement of surface resistance value>
Using a surface resistance measuring instrument (ULTRA MEGOHMMETER SM-8210, SME-8310 made by Toa DKK)
The surface resistance value of each battery packaging material was measured under the conditions of an applied voltage of 1000 V and an applied time of 1 minute. The results are shown in Table 1.

<Abrasion resistance>
Using a Gakushin friction tester, load resistance: 500 gf, reciprocating distance: 120 mm, reciprocating speed: 30 ± 2 times / minute, use waste: Kimwipe evaluated. The results are shown in Table 1.
○: Scratch depth is less than 1 μm and GU value change is less than 1 Δ: Scratch depth is less than 1 μm and GU value change is more than 1 ×: Scratch depth is 1 μm or more

<Identity>
The surface of the identification layer of each battery packaging material was visually observed, and the identification was evaluated according to the following criteria. The results are shown in Table 1.
○: Easy to distinguish from battery packaging material without identification layer ×: Difficult to distinguish from battery packaging material without identification layer

<Moldability>
Each battery packaging material obtained above was cut into a rectangle of 80 mm × 120 mm to prepare a sample. Using a molding die (female die) having a diameter of 30 × 50 mm and a molding die (male die) corresponding to this sample, with a pressing pressure of 0.4 MPa and a molding depth of 4.5 mm, Molding was performed. About the sample after cold forming, the change (whitening) of the color of the corner part of the battery packaging material was confirmed, and the moldability of the battery packaging material was evaluated according to the following criteria. The results are shown in Table 1.
○: Color change (whitening) at the corner is not easily known ×: Color change (whitening) at the corner is easily understood

  As shown in Table 1, in Examples 1 to 6 in which the identification layer was formed of a resin composition containing a conductive pigment and an insulating pigment, a battery packaging material having a large surface resistance value and excellent discrimination was obtained. It was. On the other hand, in Comparative Example 1 in which only the conductive pigment was used in the identification layer and no insulating pigment was used, the surface resistance was small although the identification was excellent. Moreover, in the comparative example 2 which did not use a conductive pigment and an insulating pigment in an identification layer, it was inferior to discrimination and surface resistance was also small. Further, in Comparative Example 3 in which carbon black was blended with a polyester-based adhesive forming an adhesive layer, the surface resistance was very small, although the discrimination was excellent.

DESCRIPTION OF SYMBOLS 1 Base material layer 2 Adhesion layer 3 Metal layer 4 Sealant layer 5 Adhesion layer 6 Identification layer

Claims (13)

It consists of a laminate having at least a base material layer, a metal layer, and a sealant layer in this order,
The battery packaging material, wherein the outermost layer on the substrate layer side of the laminate comprises an identification layer formed of a resin composition containing a conductive pigment and an insulating pigment.   The battery packaging material according to claim 1, wherein the identification layer is provided outside the base material layer.   The battery packaging material according to claim 1, wherein the base material layer constitutes the identification layer.   The battery packaging material according to claim 1, wherein the identification layer further contains a filler.   The battery packaging material according to any one of claims 1 to 4, wherein the conductive fine particles are carbon black.   The battery packaging material according to claim 1, wherein the laminate has a thickness of 100 μm or less.   The battery packaging material according to any one of claims 1 to 6, wherein the base material layer is formed of at least one of a polyamide resin and a polyester resin.   The battery packaging material according to claim 1, further comprising an adhesive layer between the base material layer and the metal layer.   The battery packaging material according to any one of claims 1 to 8, wherein the metal layer is formed of an aluminum foil.   The battery by which the battery element provided with the positive electrode, the negative electrode, and the electrolyte at least is accommodated in the battery packaging material in any one of Claims 1-9. At least a layering step for obtaining a laminate having a base material layer, a metal layer, and a sealant layer in this order;
In the stacking step, a battery packaging material manufacturing method in which an identification layer formed of a resin composition containing a conductive pigment and an insulating pigment is stacked as the outermost layer on the substrate layer side of the stacked body.   The method for manufacturing a battery packaging material according to claim 11, wherein the stacking step includes a step of stacking the identification layer outside the base material layer.   The manufacturing method of the packaging material for batteries of Claim 11 provided with the process of laminating | stacking the said base material layer as the said identification layer in the said lamination process.