WO2015046570A1

WO2015046570A1 - Rolled body of battery packaging material

Info

Publication number: WO2015046570A1
Application number: PCT/JP2014/076092
Authority: WO
Inventors: 一彦横田; 山下　力也; 陽祐早川
Original assignee: 大日本印刷株式会社
Priority date: 2013-09-30
Filing date: 2014-09-30
Publication date: 2015-04-02
Also published as: CN105594011A; KR20160064179A; CN105594011B; CN111251667A; CN111251667B

Abstract

The present invention relates to the rolled body of a battery packaging material consisting of a laminated film in which at least a coating layer, a base material layer, a metal layer, and a sealant layer are laminated in this order. The coating layer is formed of a two-liquid curing type resin. The sealant layer is formed of a melt-extruded thermoplastic resin and contains foreign particles or unmelted particles of the thermoplastic resin. A mark is placed on the laminated film so that the position of a protrusion on the surface of the sealant layer can be recognized, said protrusion being attributable to the foreign particles or the unmelted particles and having an area exceeding 0.4 mm2 when viewed from the laminated direction of the laminated film. The rolled body is rolled so that the surface of the sealant layer and the surface of the coating layer contact each other. This makes it possible to appropriately control defects in the coating layer.

Description

Winding body for battery packaging materials

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

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

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

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

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

Such a battery packaging material is generally manufactured as a strip-shaped laminated film on 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 cuts and uses it so that it may become a predetermined shape according to the product specification of a battery.

JP 2008-287971 A

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

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

The first aspect A and the second aspect B of the present invention are inventions made in view of such problems. That is, in the first aspect A and the second aspect B, the wound body of the battery packaging material, the manufacturing method of the wound body, and the battery in which defects in the coating layer located in the outermost layer are suitably managed The main object of the present invention is to provide a method for inspecting a defect in a coating layer located on the outermost layer of a packaging material for use.

Also, battery packaging materials are generally molded and used in order to enclose battery elements such as electrolytes and electrodes. However, at the time of molding, pinholes may occur in the stretched portion of the battery packaging material, and the insulation of the battery packaging material may be reduced. When a battery is manufactured using such a battery packaging material that generates a pinhole, the pinhole is found only when the battery packaging material is formed in the battery manufacturing process. For this reason, when the packaging material for a battery is cut out from a wound body of the packaging material for a battery whose defects causing the pinhole are not managed and used for the production of the battery, the yield of the battery production may be reduced. is there.

The third aspect C of the present invention is an invention made in view of such a problem. That is, the third aspect C is a battery packaging material winding body in which defects that cause pinholes are suitably managed, a method for manufacturing the winding body, and a method for inspecting defects in the battery packaging material The main purpose is to provide

The present inventor has intensively studied to solve the above-described problems concerning the first aspect A and the second aspect B of the present invention. As a result, after the battery packaging material is manufactured as a roll-shaped winding body, there is a defect in the coating layer for some reason before the battery packaging material is unwound from the winding body and used for manufacturing the battery. It was found to have occurred. The present inventor has further studied about this reason, and as a result, when the coating layer is formed of a two-component curable resin and the sealant layer is formed of a melt-extruded thermoplastic resin, a laminated film On the sealant layer located on the opposite side of the coating layer, convex portions due to foreign matter or unmelted thermoplastic resin are formed with a low frequency of occurrence, and the size of the convex portions is a certain size. When the laminated film is wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other, the convex portions on the surface of the sealant layer are pressed against the coating layer, and the thin coating layer is formed. We found that a defect occurred. In addition, when the coating layer is formed of a two-component curable resin, the two-component curable resin may be wound up after being completely cured after the two-component curable resin is applied on the base material layer. It has been found that defects are particularly likely to occur when the coating layer is formed from a curable resin.

And this inventor is the winding body of the packaging material for batteries which consists of a laminated | multilayer film by which the coating layer, the base material layer, the metal layer, and the sealant layer were laminated | stacked in this order at least, Comprising: It is formed of a two-component curable resin, the sealant layer is formed of a melt-extruded thermoplastic resin, the sealant layer contains foreign matters or an unmelted product of the thermoplastic resin, and the following (1A) or In the case of (2A), when the wound body is a wound body of a battery packaging material wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other, defects in the coating layer can be obtained. I found that it can be managed properly. The first aspect A of the present invention is an invention that has been completed by further studies based on these findings.
(1A) On the surface of the sealant layer, the number of convex portions due to foreign matter or unmelted material, the area of which is greater than 0.4 mm ² when viewed from the lamination direction of the laminated film, has a width of 80 to When it is within one per 100 m length of 600 mm laminated film.
(2A) On the surface of the sealant layer, it is possible to recognize the position of the convex portion due to the foreign matter or the unmelted material and having an area exceeding 0.4 mm ² when viewed from the lamination direction of the laminated film. When the mark is given to the laminated film.

In addition, when the coating layer is formed of a two-component curable resin and the indentation protrudes from the coating layer of the laminated film to the sealant layer, the inventor generates low protrusions due to the indentation. When the laminated film is wound so that the surface of the sealant layer and the surface of the coating layer come into contact with each other when the size of the indentation (convex part) exceeds a certain size, the sealant is wound up. It has also been found that the convex portions on the surface of the layer are pressed against the coating layer, and a defect occurs in the thin coating layer. Such an indentation is considered to be formed by a slight contact of the laminated film with an apparatus or the like in the manufacturing process.

As a result of further investigations, the present inventor, contrary to the above, when there is an indentation protruding from the sealant layer to the coating layer, the indentation (convexity) Part) exceeds a certain size, the thickness of the coating layer in the convex part is reduced, and when the laminated film is wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other, It was found that the convex portions on the surface of the coating layer were pressed against the sealant layer, and the convex portions of the coating layer were defective.

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

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

In addition, the present inventor has intensively studied to solve the above-described problem with respect to the third aspect C of the present invention. As a result, the following knowledge was obtained. That is, the battery packaging material is manufactured as a laminated film by laminating the layers constituting the battery packaging material. In such a manufacturing process, when laminating each layer of the laminated film, the foreign matter adhering to the device or the foreign matter scattered in the air falls on the layer in the laminating step, and the adjacent layer as it is. By being laminated, a foreign substance may be contained in the interface portion of the layer contained in the laminated film. In addition, foreign matters may adhere to the resin film, metal foil, and the like that are provided for lamination, which may be laminated as they are. Such foreign matter is, for example, dust or a metal piece. When a battery packaging material in which such foreign matter is present at the interface portion of the layer of the laminated film is molded, the portion where the foreign matter is present and other portions are formed. It has become clear that pinholes are likely to occur in areas where foreign matter exists due to differences in elongation. And when the inventor further examined, a foreign matter having an area of 0.4 mm ² or more when viewed from the lamination direction of the laminated film is particularly likely to cause pinholes due to molding, and is smaller than this. It became clear that it would be difficult to cause pinholes.

And this inventor is the winding body of the packaging material for batteries which consists of a laminated | multilayer film by which the base material layer, the contact bonding layer, the metal layer, and the sealant layer were laminated | stacked in this order at least, Comprising: In the case of the following (1C) or (2C), there is a foreign substance having an area of 0.4 mm ² or more when viewed from the lamination direction of the laminated film at the interface part of at least two layers included Found that defects that cause pinholes can be properly managed. The third aspect C of the present invention is an invention that has been completed by further studies based on these findings.
(1C) The number of the above foreign matters having an area of 0.4 mm ² or more is 1 or less per 100 m length of a laminated film having a width of 80 to 600 mm.
(2C) When the mark is given to the laminated film so that the position of the foreign matter having an area of 0.4 mm ² or more can be recognized.

That is, the first aspect A, the second aspect B, and the third aspect C of the present invention provide the following aspects of the invention.
(First aspect A)
Item 1A. At least a winding body for a battery packaging material comprising a laminated film in which a coating layer, a base material layer, a metal layer, and a sealant layer are laminated in this order,
The coating layer is formed of a two-component curable resin,
The sealant layer is formed of a melt-extruded thermoplastic resin,
The sealant layer includes foreign matter or an unmelted material of the thermoplastic resin,
On the surface of the sealant layer, it is possible to recognize the position of a convex portion caused by the foreign matter or the unmelted material, and having an area that exceeds 0.4 mm ² when viewed from the lamination direction of the laminated film. In addition, a mark is given to the laminated film,
The wound body is a wound body for a battery packaging material wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other.
Item 2A. Item 1. The battery packaging material roll according to Item 1A, wherein the coating layer has a thickness of 5 μm or less.
Item 3A. Item 2. The wound body for battery packaging material according to Item 1A or 2A, wherein the laminated film has a thickness of 200 μm or less.
Item 4A. Item 4. The battery packaging material roll according to any one of Items 1A to 3A, wherein the height of the convex portion is 2 μm or more.
Item 5A. Item 4. The wound body for a battery packaging material according to any one of Items 1A to 4A, wherein the wound body is a roll having a length of the laminated film of 200 m or more and a circular cross-sectional diameter of 150 mm or more.
Item 6A. A method for manufacturing a wound body for a battery packaging material according to any one of Items 1A to 5A,
Forming a metal layer on one surface of the substrate layer;
A step of melt-extruding a thermoplastic resin on the metal layer to form the sealant layer;
Applying the two-component curable resin to the surface of the base material layer opposite to the metal layer to form the coating layer;
After obtaining a laminated film by a laminating process including:
In the laminated film, the position of the convex part due to the foreign matter or the unmelted material contained in the sealant layer, the area when viewed from the lamination direction of the laminated film exceeds 0.4 mm ² So that the mark can be recognized on the laminated film,
Winding the laminated film so that the surface of the sealant layer and the surface of the coating layer are in contact with each other, and obtaining a winding body;
The manufacturing method of the winding body of the packaging material for batteries provided with this.
Item 7A. At least a winding body for a battery packaging material comprising a laminated film in which a coating layer, a base material layer, a metal layer, and a sealant layer are laminated in this order,
The coating layer is formed of a two-component curable resin,
The sealant layer is formed of a melt-extruded thermoplastic resin,
The sealant layer includes foreign matter or an unmelted material of the thermoplastic resin,
On the surface of the sealant layer, the number of convex portions due to the foreign matter or the unmelted material, and having an area that exceeds 0.4 mm ² when viewed from the lamination direction of the laminated film, has a width of 80. Up to one per 100 m length of the laminated film of ~ 600 mm,
The wound body is a wound body for a battery packaging material wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other.
Item 8A. Item 7. The winding body for battery packaging material according to Item 7A, wherein the coating layer has a thickness of 5 μm or less.
Item 9A. Item 7. The wound packaging material for battery materials according to Item 7A or 8A, wherein the laminated film has a thickness of 200 μm or less.
Item 10A. Item 10. The winding body for battery packaging material according to any one of Items 7A to 9A, wherein the height of the convex portion is 2 μm or more.
Item 11A. Item 11. The wound body for battery packaging material according to any one of Items 7A to 10A, wherein the wound body is a roll having a length of the laminated film of 200 m or more and a circular cross-sectional diameter of 150 mm or more.
Item 12A. A method for producing a wound body for a battery packaging material according to any one of Items 7A to 11A,
Forming a metal layer on one surface of the substrate layer;
A step of melt-extruding a thermoplastic resin on the metal layer to form the sealant layer;
Applying the two-component curable resin to the surface of the base material layer opposite to the metal layer to form the coating layer;
After obtaining a laminated film by a laminating process including:
In the laminated film, a convex portion due to the foreign matter or the unmelted material contained in the sealant layer, and a convex portion whose area when viewed from the lamination direction of the laminated film exceeds 0.4 mm ² is located. Removing the portion to be removed, the number of the protrusions whose area exceeds 0.4 mm ² to be within one per 100 m length of the laminated film having a width of 80 to 600 mm,
Winding the laminated film so that the surface of the sealant layer and the surface of the coating layer are in contact with each other, and obtaining a winding body;
The manufacturing method of the winding body of the packaging material for batteries provided with this.
Item 13A. Item 12. A packaging for a battery according to item 12A, comprising a step of providing a mark on the laminated film so that the position of the convex part where the area of the laminated film exceeds 0.4 mm ² can be recognized in the convex part removing step. A method of manufacturing a wound body of material.
Item 14A. At least a coating layer formed of a two-component curable resin, a base material layer, a metal layer, and a sealant layer formed of a melt-extruded thermoplastic resin and containing foreign matter or an unmelted product of the thermoplastic resin; Is a defect inspection method for battery packaging materials consisting of laminated films laminated in this order,
Imaging the surface of the sealant layer, the steps of the area when viewed from the laminating direction of the laminated film is more than 0.4 mm ^2, and records the position information of the convex portions due to the foreign matter or the unmelted material,
In accordance with the position information, the step of providing a mark on the laminated film so that the position of the convex portion having an area exceeding 0.4 mm ² can be recognized;
A defect inspection method for battery packaging materials.

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

(Third aspect C)
Item 1C. At least a wound body of a battery packaging material comprising a laminated film in which a base material layer, an adhesive layer, a metal layer, and a sealant layer are laminated in this order,
In the interface portion of at least two layers included in the laminated film, there are foreign matters having an area of 0.4 mm ² or more when viewed from the lamination direction of the laminated film,
A wound body of a battery packaging material in which a mark is given to the laminated film so that the position of the foreign matter can be recognized.
Item 2C. The foreign matter is present at least at an interface portion between the base material layer and the adhesive layer, an interface portion between the adhesive layer and the metal layer, or an interface portion between the metal layer and the sealant layer. The winding body of the packaging material for batteries as described in 1C.
Item 3C. The winding body for battery packaging material according to Item 1C or 2C, wherein the sealant layer is formed of a plurality of layers, and the foreign matter is present at an interface portion between the metal layer and the sealant layer.
Item 4C. The laminated film has a coating layer on the side opposite to the adhesive layer of the base material layer,
Item 4. The wound body for battery packaging material according to any one of Items 1C to 3C, wherein the foreign matter is present at an interface portion between the coating layer and the base material layer.
Item 5C. Item 5. The wound body for battery packaging material according to any one of Items 1C to 4C, wherein the wound body is a roll having a length of the laminated film of 200 m or more and a circular cross-sectional diameter of 150 mm or more.
Item 6C. A method for producing a wound body for a battery packaging material according to any one of Items 1C to 5C,
After obtaining a laminated film by a laminating step of laminating a base material layer, an adhesive layer, a metal layer, and a sealant layer,
Foreign matter contained in the interface part of at least two layers contained in the laminated film,
A mark applying step of applying a mark to the laminated film so that the position of the foreign matter having an area of 0.4 mm ² or more when viewed from the lamination direction of the laminated film can be recognized;
Winding the laminated film to obtain a wound body; and
The manufacturing method of the winding body of the packaging material for batteries provided with this.
Item 7C. At least a wound body of a battery packaging material comprising a laminated film in which a base material layer, an adhesive layer, a metal layer, and a sealant layer are laminated in this order,
The length of the laminated film having a width of 80 to 600 mm at the interface part of at least two layers contained in the laminated film, the number of foreign matters having an area of 0.4 mm ² or more when viewed from the lamination direction of the laminated film The winding body of the packaging material for batteries which is 1 or less per 100 m.
Item 8C. The foreign matter is present at least at an interface portion between the base material layer and the adhesive layer, an interface portion between the adhesive layer and the metal layer, or an interface portion between the metal layer and the sealant layer. The winding body of the packaging material for batteries as described in 7C.
Item 9C. Item 7. The battery packaging material roll according to Item 7C or 8C, wherein the sealant layer is formed of a plurality of layers, and the foreign matter is present at an interface portion between the metal layer and the sealant layer.
Item 10C. The laminated film has a coating layer on the side opposite to the adhesive layer of the base material layer,
Item 10. The winding body for battery packaging material according to any one of Items 7C to 9C, wherein the foreign matter is present at an interface portion between the coating layer and the base material layer.
Item 11C. Item 11. The wound body for a battery packaging material according to any one of Items 7C to 10C, wherein the wound body is a roll having a length of the laminated film of 200 m or more and a circular cross-sectional diameter of 150 mm or more.
Item 12C. A method for producing a wound body of a battery packaging material according to any one of Items 7C to 11C,
After obtaining a laminated film by a laminating step of laminating a base material layer, an adhesive layer, a metal layer, and a sealant layer,
The foreign matter contained in the interface portion of at least two layers contained in the laminated film, the portion when the foreign matter having an area of 0.4 mm ² or more when viewed from the lamination direction of the laminated film is removed, A foreign matter removing step of reducing the number of foreign matters having an area of 0.4 mm ² or more to one or less per 100 m of the laminated film having a width of 80 to 600 mm;
Winding the laminated film to obtain a wound body; and
The manufacturing method of the winding body of the packaging material for batteries provided with this.
Item 13C. The battery packaging according to Item 12C, further comprising a mark applying step of applying a mark to the laminated film so that the position of the foreign material having the area of the laminated film of 0.4 mm ² or more can be recognized in the foreign matter removing step. A method of manufacturing a wound body of material.
Item 14C. At least a defect inspection method for a battery packaging material comprising a laminated film in which a base material layer, an adhesive layer, a metal layer, and a sealant layer are laminated in this order,
The surface of the laminated film is imaged, and the position information of foreign matters having an area of 0.4 mm ² or more when viewed from the laminating direction of the laminated film is present at an interface portion of at least two layers included in the laminated film. Recording process;
In accordance with the position information, a mark applying step for applying a mark to the laminated film so that the position of the foreign matter having an area of 0.4 mm ² or more can be recognized;
A defect inspection method for battery packaging materials.

According to the first aspect A and the second aspect B of the present invention, it is possible to provide a wound body of a battery packaging material in which defects in the coating layer are appropriately managed. Therefore, by cutting out the battery packaging material from the wound body of the battery packaging material of the first aspect A and the second aspect B and sealing the battery element, a battery having a defective coating layer is manufactured. This can be suitably suppressed, and the yield of battery manufacturing can be improved.

According to the third aspect C of the present invention, it is possible to provide a winding body for a battery packaging material in which defects that cause pinholes are appropriately managed. Therefore, a battery having a pinhole is manufactured by cutting out the battery packaging material from the wound body of the battery packaging material of the third aspect C, molding the battery packaging material, and sealing the battery element. This can be suitably suppressed, and the yield of battery manufacturing can be improved.

It is a schematic sectional drawing of an example of the laminated film which comprises the winding body of the packaging material for batteries which concerns on the 1st aspect A of this invention. It is a schematic sectional drawing of an example of the laminated film which comprises the winding body of the packaging material for batteries which concerns on the 1st aspect A of this invention. It is a schematic sectional drawing of an example of the laminated film which comprises the winding body of the packaging material for batteries which concerns on the 2nd aspect B of this invention. It is a schematic sectional drawing of an example of the laminated film which comprises the winding body of the packaging material for batteries which concerns on the 2nd aspect B of this invention. It is a schematic sectional drawing of an example of the laminated film which comprises the winding body of the packaging material for batteries which concerns on the 2nd aspect B of this invention. It is a schematic sectional drawing of an example of the laminated film which comprises the winding body of the packaging material for batteries which concerns on the 2nd aspect B of this invention. It is a schematic sectional drawing of an example of the laminated film which comprises the winding body of the packaging material for batteries which concerns on the 3rd aspect C of this invention. It is a schematic sectional drawing of an example of the laminated film which comprises the winding body of the packaging material for batteries which concerns on the 3rd aspect C of this invention.

Hereinafter, the first aspect A, the second aspect B, and the third aspect C of the present invention will be described in detail.

(First aspect A)
1A. Winding body 1A for first battery packaging material
The wound body 1A of the first battery packaging material of the first aspect A of the present invention (hereinafter sometimes simply referred to as “first wound body 1A”) includes at least a coating layer, a base A winding body of a battery packaging material comprising a laminated film in which a material layer, a metal layer, and a sealant layer are laminated in this order, wherein the coating layer is formed of a two-component curable resin, and the sealant layer is The melt-extruded thermoplastic resin, the sealant layer includes foreign matter or an unmelted product of the thermoplastic resin, and the surface of the sealant layer is a convex portion due to the foreign matter or the unmelted product, the number of protrusions area when viewed from the laminating direction of the laminated film is more than 0.4 mm ² is, is within one per length 100m of the laminated film having a width of 80 ~ 600 mm, the quotes and the surface of the sealant layer Wherein the the surface of the ring layer is wound to be in contact. Hereinafter, the winding body 1A of the first battery packaging material of the first aspect A will be described in detail with reference to FIG.

1-1A. Laminated structure of battery packaging material constituting first wound body 1A As shown in FIG. 1, for example, battery packaging material constituting first wound body 1A includes at least a coating layer 6 and a base material. The layer 1, the metal layer 3, and the sealant layer 4 are made of a laminated film laminated in this order. As described later, the first winding body 1A is formed by winding the battery packaging material in a roll shape so that the surface of the sealant layer 4 and the surface of the coating layer 6 are in contact with each other.

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

The battery packaging material only needs to include at least the coating layer 6, the base material layer 1, the metal layer 3, and the sealant layer 4, and may further include other layers. For example, as will be described later, in the battery packaging material, an adhesive layer 2 may be provided between the base material layer 1 and the metal layer 3 as necessary for the purpose of enhancing the adhesiveness thereof. In addition, an adhesive layer 5 may be provided between the metal layer 3 and the sealant layer 4 as necessary for the purpose of enhancing these adhesive properties.

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

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

Specific examples of polyamides include aliphatic polyamides such as nylon 6, nylon 66, nylon 610, nylon 12, nylon 46, and copolymers of nylon 6 and

nylon

6,6; terephthalic acid and / or Nylon 6I, Nylon 6T, Nylon 6IT, Nylon 6I6T (I represents isophthalic acid, T represents terephthalic acid) and the like containing a structural unit derived from isophthalic acid, polyamide, polymethacrylate 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 Polyester amide copolymer and polyether ester amide copolymer is a copolymer of a focus 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 uniaxial or biaxially stretched resin film, or may be formed of an unstretched resin film. Among them, a uniaxially or biaxially stretched resin film, in particular, a biaxially stretched resin film has improved heat resistance by orientation crystallization, and thus is suitably used as the base material layer 1.

Among these, the resin film forming the base layer 1 is preferably nylon or polyester, more preferably biaxially stretched nylon, biaxially stretched polyester, and particularly preferably biaxially stretched nylon.

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

The thickness of the base material layer 1 is not particularly limited, but can be, for example, about 5 μm to 50 μm, preferably about 12 μm to 30 μm.

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

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

The coating layer 6 is preferably formed thin enough to exhibit resistance to an electrolytic solution, and the thickness is preferably 5 μm or less, more preferably 3 μm or less. From the viewpoint of resistance to electrolytic solution, the lower limit of the thickness of the coating layer 6 is usually about 2 μm.

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

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

Specific examples of the resin component of the adhesive that can be used to form the adhesive layer 2 include polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, polycarbonate, and copolyester. Resin; Polyether adhesive; Polyurethane adhesive; Epoxy resin; Phenol resin resin; Polyamide resin such as nylon 6, nylon 66, nylon 12, copolymer polyamide; polyolefin, acid-modified polyolefin, metal-modified polyolefin, etc. Polyolefin resin; polyvinyl acetate resin; cellulose adhesive; (meth) acrylic resin; polyimide resin; amino resin such as urea resin and melamine resin; chloroprene rubber, nitrile rubber, steel Silicone resin; - down rubber such as butadiene rubber 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.

Also, 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.

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

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

The thickness of the metal layer 3 is not particularly limited, but can be, for example, about 10 μm to 200 μm, preferably about 20 μm to 100 μm.

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

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

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

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

The amount of acid-resistant coatings to be formed on the surface of the metal layer 3 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 3, chromic acid compounds About 0.5 mg to about 50 mg in terms of chromium, preferably about 1.0 mg to about 40 mg, phosphorus compound is about 0.5 mg to about 50 mg in terms of phosphorus, preferably about 1.0 mg to about 40 mg, and aminated phenol weight It is desirable that the combination is 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, a solution containing a compound used for forming an acid-resistant film is applied to the surface of the metal layer by a bar coating method, a roll coating method, a gravure coating method, an immersion method, or the like, and then the temperature of the metal layer is 70. It is carried out by heating so as to reach about 200 ° C to 200 ° C. Further, before the chemical conversion treatment is performed on the metal layer, the metal layer may be previously subjected to a degreasing treatment by an alkali dipping method, an electrolytic cleaning method, an acid cleaning method, an electrolytic acid cleaning method, or the like. By performing the degreasing treatment in this way, it becomes possible to more efficiently perform the chemical conversion treatment on the surface of the metal layer.

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

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

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

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

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

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

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

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

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

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

The sealant layer 4 may be formed of only one type of resin component or may be formed of a blend polymer obtained by combining two or more types of resin components. Furthermore, the sealant layer 4 may be formed of only one layer, or may be formed of two or more layers using the same or different resin components.

As will be described later, when the sealant layer 4 is formed of a melt-extruded thermoplastic resin, an unmelted thermoplastic resin or foreign matter may be included in the process of forming the sealant layer 4. When such an unmelted material or foreign matter is contained in the molten thermoplastic resin that has been melt-extruded, when the thermoplastic resin is cured and the sealant layer 4 is formed, As a result, a convex portion may be formed on the surface of the sealant layer 4. Among such convex portions, the number of convex portions having an area exceeding 0.4 mm ² when the laminated film is viewed from the laminating direction generally exceeds one per 100 m of a laminated film having a width of 80 to 600 mm. . On the other hand, in the first wound body 1A according to the first aspect A, as will be described later, the number of convex portions having an area exceeding 0.4 mm ² is the length of the laminated film having a width of 80 to 600 mm. It is managed so that it is 1 or less per 100 m.

In the first wound body 1A, the height of the convex portion having an area exceeding 0.4 mm ² is usually 2 μm or more and 50 μm or less. In addition, the height of the convex part whose area exceeds 0.4 mm ² means the height from the surface of the part where the convex part of the sealant layer 4 is not formed to the apex of the convex part.

The thickness of the sealant layer 4 is not particularly limited, but may be, for example, about 2 μm to 2000 μm, preferably about 5 μm to 1000 μm, and more preferably 10 μm to 500 μm. In addition, the thickness of the sealant layer 4 is a thickness of a portion where the above-described convex portions are not formed.

1-3A. Configuration of First Winding Body 1A The first winding body 1A according to the first aspect A has the above-described battery packaging material (such as the surface of the sealant layer 4 and the surface of the coating layer 6). (Laminated film) is wound into a roll. In the first wound body 1A, the number of convex portions having an area exceeding 0.4 mm ² when viewed from the laminating direction of the laminated film is 1 or less per 100 m length of the laminated film having a width of 80 to 600 mm. Managed. Specifically, for example, as shown in a manufacturing method of the first winding body 1A described later, after each layer is laminated to produce a strip-shaped laminated film, the area is 0.4 mm ² before winding the film. By removing the part where the convex part exceeding the thickness is removed from the laminated film and making the number of the convex parts within one per 100 m of the length of the laminated film having a width of 80 to 600 mm, by contacting the convex part The number of defects in the resulting coating layer 6 is managed. That is, in the first wound body 1A, the number of such convex portions is managed so as to be not more than one per 100 m of a laminated film having a width of 80 to 600 mm. Generation | occurrence | production of the defect of the coating layer 6 which arises is suppressed. Therefore, by cutting out the battery packaging material unwound from the first winding body 1A and sealing the battery element, it is possible to suitably suppress the production of a battery having a defect in the coating layer 6. And the yield of battery manufacturing can be improved. As will be described later, in the first winding body 1A, the portion where the convex portion having an area exceeding 0.4 mm ² is located may be removed by cutting out only that portion or its periphery. Then, the laminated film may be cut in the width direction so as to include a portion where the convex portion is located, and the laminated film may be connected with a tape or the like.

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

1-4A. Method for Producing First Winding Body 1A The method for producing the first winding body 1A according to the first aspect A includes laminating the above layers having a predetermined configuration, and the number and size of the convex portions of the sealant layer 4. Although it will not restrict | limit as long as the thing by which the laminated | multilayer film by which the thickness etc. were managed was obtained is obtained, For example, the following methods can be illustrated.

First, at least the coating layer 6, the base material layer 1, the metal layer 3, and the sealant layer 4 are laminated in this order to obtain a laminated film. Specifically, for example, a laminated film is obtained as follows. First, the base material layer 1 and the metal layer 3 are laminated. This lamination can be performed, for example, by a dry lamination method using the above-described adhesive component that forms the adhesive layer 2. Moreover, as a method of laminating the base material layer 1 and the metal layer 3, a method of extruding a resin for forming the base material layer 1 on the surface of the metal layer 3 or a metal on one surface of the base material layer 1. For example, a method of forming the metal layer 3 by vapor deposition. Next, the sealant layer 4 is laminated on the metal layer 3. This lamination can be performed by, for example, a dry lamination method. In addition, for the purpose of increasing the adhesive strength between the metal layer 3 and the sealant layer 4, an adhesive component for forming the adhesive layer 5 is applied on the metal layer 3 and dried as necessary. The sealant layer 4 may be formed from above. The sealant layer 4 is formed by melt extrusion of the thermoplastic resin. From the viewpoint of reducing the number of unmelted thermoplastic resins and suppressing the formation of protrusions with the above area exceeding 0.4 mm ² , the temperature of the thermoplastic resin during melt extrusion is preferably 160 ° C. or higher. Preferably 180 degreeC or more is mentioned. Next, the coating layer 6 is laminated on the surface of the base material layer 1 opposite to the metal layer 3. The coating layer 6 can be formed, for example, by applying the two-component curable resin for forming the coating layer 6 to the surface of the base material layer 1. The order of the step of laminating the metal layer 3 on the surface of the base material layer 1 and the step of laminating the coating layer 6 on the surface of the base material layer 1 are not particularly limited. For example, after forming the coating layer 6 on the surface of the base material layer 1, the metal layer 3 may be formed on the surface of the base material layer 1 opposite to the coating layer 6.

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

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

Next, in 1st aspect A, in a laminated film, it is a convex part resulting from the foreign material contained in the sealant layer 4, or an unmelted object, Comprising: The area when it sees from the lamination direction of a laminated film is 0.4 mm < ² >. The convex portion removing step is performed to remove the portion where the convex portion exceeding 1 is removed and to make the number of convex portions having an area exceeding 0.4 mm ² within one per 100 m of the length of the laminated film having a width of 80 to 600 mm. The size, position, and number of the convex portions can be detected by, for example, the defect inspection method A of the first aspect A described later. That is, the step of imaging the surface of the sealant layer 4 and recording the positional information of the convex portion due to the foreign matter or the unmelted material when the area when viewed from the laminating direction of the laminated film exceeds 0.4 mm ² ; According to the position information, the size, the position, and the number of the convex portions can be grasped by performing the step of applying a mark to the laminated film so that the position of the convex portions can be recognized. Next, according to the obtained positional information, the number of convex portions having an area exceeding 0.4 mm ² on the surface of the sealant layer is within one per 100 m of a laminated film having a width of 80 to 600 mm. Remove the part. The part where the convex part where the area of the laminated film exceeds 0.4 mm ² may be cut out and removed only that part or its periphery, and the laminated film may be removed in the width direction including the part where the convex part is located. The laminated film may be cut with a tape or the like.

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

2A. Winding body 2A for second battery packaging material
The wound body 2A of the second battery packaging material of the first aspect A (hereinafter sometimes simply referred to as “second wound body 2A”) includes at least a coating layer, a base material layer, A wound body of a battery packaging material comprising a laminated film in which a metal layer and a sealant layer are laminated in this order, wherein the coating layer is formed of a two-component curable resin, and the sealant layer is melted Formed of an extruded thermoplastic resin, the sealant layer includes foreign matter or an unmelted product of the thermoplastic resin, and is a convex portion due to the foreign matter or the unmelted material on the surface of the sealant layer, as the area when viewed from the laminating direction of the laminated film can be recognized the position of the convex portion exceeds 0.4 mm ^2, and the mark is applied to the laminated film, the surface of the surface and the coating layer of the sealant layer Characterized in that it is wound in contact. Hereinafter, the winding body 2A of the second battery packaging material of the first aspect A will be described in detail.

2-1A. Stack structure of battery packaging material constituting second winding body 2A The battery packaging material constituting second winding body 2A of first aspect A is the first winding body 1A described above. It has the same laminated structure as the battery packaging material that constitutes. That is, for example, as shown in FIG. 1, at least a coating layer 6, a base material layer 1, a metal layer 3, and a sealant layer 4 are made of a laminated film laminated in this order.

2-2A. Configuration of each layer of battery packaging material constituting second winding body 2A Configuration of each layer of battery packaging material constituting second winding body 2A, ie, coating layer 6, base material layer 1, necessary The structure of the adhesive layer 2, the metal layer 3, the adhesive layer 5 provided as needed, and the sealant layer 4 are formed according to the respective layers of the battery packaging material constituting the first winding body 1A described above. It is the same as that of the structure. However, the sealant layer 4 is different in the following points.

In the sealant layer 4 in the first wound body 1A, the number of convex portions having an area exceeding 0.4 mm ² when the laminated film is viewed from the lamination direction is the length of the laminated film having a width of 80 to 600 mm. It is managed so that it is 1 or less per 100 m. On the other hand, in the sealant layer 4 in the second winding body 2A, the number of convex portions having such a size is not necessarily managed, but the stacking is performed so that the position of the convex portion can be recognized. By providing a mark on the film, the position of the convex portion is managed. Therefore, in the sealant layer 4 in the second wound body 2A, the number of convex portions having an area exceeding 0.4 mm ² when the laminated film is viewed from the lamination direction is usually that of the laminated film having a width of 80 to 600 mm. More than one per 100m in length.

2-3A. Configuration of Second Winding Body 2A The second winding body 2A according to the first aspect A has the battery packaging material (lamination) so that the surface of the sealant layer 4 and the surface of the coating layer 6 are in contact with each other. Film) is wound into a roll. In the second wound body 2A, the mark is given to the laminated film so that the position of the convex part when the area when viewed from the lamination direction of the laminated film exceeds 0.4 mm ² can be recognized. The position of the department is managed. Specifically, as shown in the manufacturing method of the second winding body 2A described later, etc., after each layer is laminated to produce a belt-like laminated film, the area of the laminated film is 0 before winding the film. The position of the convex part is managed by giving a mark to the laminated film so that the position of the convex part exceeding 4 mm ² can be recognized. That is, in the 2nd winding body 2A, since it manages so that the position of such a convex part in a laminated film can be recognized, also about the defect position of the coating layer 6 in the vicinity of the said convex part, it is easy. Can be recognized. Therefore, when the battery packaging material unwound from the second winding body 2A is cut out and used for sealing the battery element, a battery can be manufactured by avoiding a defective portion in the coating layer 6, The yield of battery manufacturing can be improved. In the second winding body 2A, the mark attached so that the position of the convex portion can be recognized may be provided on the convex portion, or may be provided in the vicinity of the convex portion. Good. Moreover, such a mark can be provided using, for example, ink.

In the second wound body 2A, the length of the laminated film constituting the battery packaging material is not particularly limited, but is, for example, 200 m or more, preferably about 200 to 600 m. The width of the laminated film is, for example, about 0.01 to 1 m, preferably about 0.1 to 1 m. The thickness of the laminated film is, for example, 200 μm or less, preferably about 50 to 200 μm, more preferably about 65 to 130 μm. In the roll-shaped second winding body 2A, the diameter of the circular cross section in the direction perpendicular to the width direction of the laminated film is preferably 150 mm or more, more preferably 220 mm or more. In addition, the upper limit of the diameter of the circular section is usually about 350 mm.

2-4A. Manufacturing method of 2nd winding body 2A The manufacturing method of 2nd winding body 2A of 1st aspect A is the same as the manufacturing method of said 1st winding body 1A until it obtains a laminated | multilayer film. It is.

Next, in the laminated film, the position of the convex portion due to the foreign matter or unmelted material contained in the sealant layer 4 and having an area that exceeds 0.4 mm ² when viewed from the lamination direction of the laminated film. A mark applying step for applying a mark to the laminated film is performed so that the film can be recognized. The size, position, and number of the convex portions can be detected by, for example, a defect inspection method described later. That is, the step of imaging the surface of the sealant layer 4 and recording the positional information of the convex portion due to the foreign matter or the unmelted material when the area when viewed from the lamination direction of the laminated film exceeds 0.4 mm ² ; According to the position information, a step of applying a mark to the laminated film is performed so that the position of the convex portion can be recognized.

Next, a winding process is performed in which the laminated film is wound so that the surface of the sealant layer 4 and the surface of the coating layer 6 are in contact to obtain the second wound body 2A. The method for winding the laminated film is not particularly limited as long as the belt-like laminated film is wound in a roll shape, and may be wound on a roll or the like using a known film winder or the like.

3A. Defect inspection method A for battery packaging materials
The defect inspection method A for battery packaging material according to the first aspect A (hereinafter sometimes simply referred to as “defect inspection method A”) includes at least a coating layer formed of a two-component curable resin, and a base material layer A defect inspection method for a battery packaging material comprising a laminated film in which a metal layer and a sealant layer formed of a melt-extruded thermoplastic resin and containing a foreign material or an unmelted thermoplastic resin are laminated in this order. And imaging the surface of the sealant layer, and recording the positional information of the convex portion due to the foreign matter or the unmelted material when the area when viewed from the lamination direction of the laminated film exceeds 0.4 mm ² And a step of applying a mark to the laminated film so that the position of the convex part having an area exceeding 0.4 mm ² can be recognized according to the position information.

In the defect inspection method A of the first aspect A, the configuration of the battery packaging material subjected to the inspection is the same as the configuration of the battery packaging material constituting the first winding body 1A described above. However, the sealant layer 4 is different in the following points. That is, in the sealant layer 4 in the first wound body 1A, the number of convex portions having an area exceeding 0.4 mm ² when the laminated film is viewed from the lamination direction is the length of the laminated film having a width of 80 to 600 mm. While it is managed so that it is 1 or less per 100 m, such management is not performed in the battery packaging material that is the object of the defect inspection method A of the first aspect A. Therefore, in the sealant layer 4 of the battery packaging material that is the target of the defect inspection method A of the first aspect A, the number of the convex portions whose area when the laminated film is viewed from the lamination direction exceeds 0.4 mm ² is Usually, it exceeds 1 per 100 m of a laminated film having a width of 80 to 600 mm.

In the defect inspection method A of the first aspect A, first, the surface of the sealant layer 4 of such a battery packaging material is imaged using a camera or the like, and the area when viewed from the lamination direction of the laminated film is A recording step of recording the positional information of the convex portion due to foreign matter or unmelted material exceeding 0.4 mm ² is performed. At this time, it is preferable to record information such as the size and height of the convex portion. Such a recording process for recording the position information of the convex portion can be performed by using a known defect inspection apparatus used for defect inspection such as fish eye in the film. A commercial item can be used as such a defect inspection apparatus.

Next, according to the positional information obtained in the recording process, a mark applying process for applying a mark to the laminated film is performed so that the position of the convex part having an area exceeding 0.4 mm ² can be recognized. The position of the mark is not particularly limited as long as it is given so that the position of the convex part can be recognized. For example, the mark may be given on the convex part or in the vicinity of the convex part. May be. Such a mark application process can also be performed by using a known defect inspection apparatus as described above. The type of the mark is not particularly limited as long as the position can be recognized. For example, an ink or the like used for a general film defect inspection apparatus can be used in the present invention.

The defect inspection method A of the first aspect A makes it possible to manage the position, size, number, and the like of the convex portions on the surface of the sealant layer 4 that cause defects in the coating layer 6 as described above. That is, for example, by applying the defect inspection method A of the first aspect A to the battery packaging material, the position of such a convex portion in the laminated film can be recognized as in the second winding body 2A. It is possible to easily manage the defect position of the coating layer 6 generated in the vicinity of the convex portion. Therefore, when the battery packaging material unwound from the second winding body 2A is cut out and used for sealing the battery element, a battery can be manufactured by avoiding a defective portion in the coating layer 6, The yield of battery manufacturing can be improved.

Further, by applying the defect inspection method A of the first aspect A, the convex portion of the sealant layer 4 that can be recognized by such a mark, like the first winding body 1A of the first aspect A, The laminated film having a width of 80 to 600 mm can be removed so as to be within one per 100 m of length. Therefore, by cutting out the battery packaging material unwound from the first winding body 1A and sealing the battery element, it is possible to suitably suppress the production of a battery having a defect in the coating layer 6. And the yield of battery manufacturing can be improved.

4A. Application of Winding Body for Battery Packaging Material Winding body A for battery packaging material according to the first aspect A is obtained by unwinding the battery packaging material and cutting it into an appropriate size to form a positive electrode, a negative electrode, and an electrolyte. It is used as a package for sealing and storing battery elements such as. That is, the battery packaging material unwound from the winding body A is deformed in accordance with the shape of the battery element, and can be a packaging body that houses the battery element.

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

The battery packaging material unwound from the winding body A of the first aspect A can be used for either a primary battery or a secondary battery, but is particularly suitable for use in a secondary battery. The type of secondary battery to which the battery packaging material is applied is not particularly limited. For example, lithium ion battery, lithium ion polymer battery, lead battery, nickel / hydrogen battery, nickel / cadmium battery, nickel / Examples include iron storage batteries, nickel / zinc storage batteries, silver oxide / zinc storage batteries, metal-air batteries, multivalent cation batteries, capacitors and capacitors. Among these secondary batteries, a lithium ion battery and a lithium ion polymer battery are suitable applications of the battery packaging material unwound from the wound body A of the first aspect A.

(Second aspect B)
1B. Winding body 1B of first battery packaging material
The wound body 1B of the first battery packaging material according to the second aspect B of the present invention (hereinafter sometimes simply referred to as “first wound body 1B”) includes at least a coating layer, a base A winding body for a battery packaging material comprising a laminated film in which a material layer, a metal layer, and a sealant layer are laminated in this order, and the coating layer is formed of a two-component curable resin, and is a laminated film Has indentations protruding from the coating layer to the sealant layer (see, for example, FIG. 3 or FIG. 4), or indentations protruding from the sealant layer to the coating layer, (see, for example, FIG. 5 or FIG. 6), as the area when viewed from the laminating direction of the laminated film can be recognized position of the indentation of more than 0.2 mm ^2, and the mark is applied to the laminated film, winding body 1B, the surface and quotes of the sealant layer Wherein the the surface of the ring layer is wound to be in contact. Hereinafter, the winding body 1B of the first battery packaging material according to the second aspect B will be described in detail with reference to FIGS.

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

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

1-2B. Configuration of each layer of battery packaging material constituting first winding body 1B In the configuration of each layer of battery packaging material constituting first winding body 1B, base material layer 1, adhesive layer 2, metal layer 3 The sealant layer 4 is the same as that in the first aspect A. However, generally, in the sealant layer 4, as shown in FIG. 3 or FIG. 4, when there is a convex portion due to the indentation protruding from the coating layer 6 to the sealant layer 4, the laminated film is generally among such indentations. The number of indentations 7 (convex portions) having an area exceeding 0.2 mm ² when viewed from the laminating direction exceeds one per 100 m of a laminated film having a width of 80 to 600 mm. In contrast, in the first wound body 1B of the second aspect B, as will be described later, the number of indentations 7 having an area exceeding 0.2 mm ² is the length of the laminated film having a width of 80 to 600 mm of 100 m. It is managed so that there is no more than one per.

In the first wound body 1B, the height of the indentation 7 (convex portion) whose area protruding toward the sealant layer 4 side exceeds 0.2 mm ² is usually 2 μm or more and 50 μm or less. Note that the height of the indentation 7 having an area exceeding 0.2 mm ² refers to the height from the surface of the portion of the sealant layer 4 where the indentation 7 is not formed to the apex of the indentation 7 (convex portion).

1-3B. Configuration of First Winding Body 1B In the first winding body 1B, the battery packaging material (laminated film) is in a roll shape so that the surface of the sealant layer 4 and the surface of the coating layer 6 are in contact with each other. It is constituted by being wound up. For example, as shown in FIG. 3 or 4, when the coating layer 6 is formed of a two-component curable resin, the area of the indentation protruding from the coating layer 6 of the laminated film to the sealant layer 4 is 0.2 mm ^2. When the laminated film is wound so that the surface of the sealant layer 4 and the surface of the coating layer 6 are in contact with each other, the convex portions on the surface of the sealant layer 4 are pressed against the coating layer 6 and are thin. Defects are particularly likely to occur in the coating layer 6. For example, as shown in FIG. 5 or FIG. 6, when the area of the indentation protruding from the sealant layer 4 to the coating layer 6 exceeds 0.2 mm ² , the thickness of the coating layer 6 is reduced, and the sealant layer 4 When the laminated film is wound so that the surface of the coating layer 6 and the surface of the coating layer 6 are in contact with each other, the convex portions on the surface of the coating layer 6 are pressed against the sealant layer 4, and the convex portions of the coating layer 6 are particularly damaged. Prone to occur.

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

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

1-4B. Method for Producing First Winding Body 1B The method for producing the first winding body 1B of the second aspect B includes laminating the above layers having a predetermined configuration, and the number and size of the impressions 7 of the laminated film. As long as a film obtained by winding a laminated film in which is controlled is obtained, there is no particular limitation. For example, the following method can be exemplified.

First, at least the coating layer 6, the base material layer 1, the metal layer 3, and the sealant layer 4 are laminated in this order to obtain a laminated film. The step of obtaining a laminated film is the same as in the first aspect A.

In order to improve the adhesiveness of each layer in the obtained laminated film, an aging treatment or the like may be performed. The aging process is the same as in the first aspect A.

Next, in the second aspect B, in the laminated film, the area where the indentation 7 where the area when viewed from the lamination direction of the laminated film exceeds 0.2 mm ² is removed, and the area exceeds 0.2 mm ² . An indentation removing step is performed in which the number of indentations 7 is within one per 100 m of a laminated film having a width of 80 to 600 mm. The size, position, and number of the indentations 7 can be detected by, for example, a defect inspection method described later. That is, a step of imaging the surface of the sealant layer 4 and recording positional information of the indentation 7 having an area of 0.2 mm ² when viewed from the lamination direction of the laminated film, and the position of the indentation 7 according to the positional information The size, position, and number of the indentations 7 can be grasped by performing the step of applying a mark to the laminated film. Next, according to the obtained position information, the indentation 7 is removed so that the number of the laminated films with a width of 80 to 600 mm is 1 or less per 100 m. The portion where the indentation 7 having an area exceeding 0.2 mm ² may be removed by cutting out only that portion or its periphery, or the laminated film may be cut in the width direction including the portion where the indentation 7 is located. The laminated film may be connected with a tape or the like.

Next, a winding process is performed in which the laminated film is wound so that the surface of the sealant layer 4 and the surface of the coating layer 6 are in contact with each other to obtain the first wound body 1B. The method for winding the laminated film is not particularly limited as long as the belt-like laminated film is wound in a roll shape, and may be wound on a roll or the like using a known film winder or the like.

2B. Winding body 2B of the second battery packaging material
The winding body 2B of the second battery packaging material (hereinafter sometimes simply referred to as “second winding body 2B”) includes at least a coating layer, a base material layer, a metal layer, and a sealant. A wound body of a battery packaging material comprising a laminated film in which layers are laminated in this order. The coating layer is formed of a two-component curable resin, and the laminated film projects from the coating layer to the sealant layer. Mark on the laminated film so that the position of the indentation when viewed from the lamination direction of the laminated film exceeds 0.2 mm ² can be recognized. Is provided, and the wound body 2B is characterized by being wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other. Hereinafter, the wound body 2B of the second battery packaging material of the second aspect B will be described in detail.

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

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

In the sealant layer 4 in the first wound body 1B, the number of the indentations 7 whose area when the laminated film is viewed from the laminating direction exceeds 0.2 mm ² is the length of the laminated film having a width of 80 to 600 mm. It is managed so that it is 1 or less per 100 m. On the other hand, in the sealant layer 4 in the second winding body 2B, the number of the indentations 7 having such a size is not necessarily managed, but the stacking is performed so that the position of the indentations 7 can be recognized. By providing a mark on the film, the position of the indentation 7 is managed. Therefore, in the sealant layer 4 in the second winding body 2B, the number of the indentations 7 having an area exceeding 0.2 mm ² when the laminated film is viewed from the laminating direction is usually that of the laminated film having a width of 80 to 600 mm. More than one per 100m in length.

2-3B. Configuration of Second Winding Body 2B In the second winding body 2B, the battery packaging material (laminated film) is roll-shaped so that the surface of the sealant layer 4 and the surface of the coating layer 6 are in contact with each other. It is constituted by being wound up. In the second wound body 2B, the indentation is given by giving a mark to the laminated film so that the position of the indentation 7 when the area viewed from the lamination direction of the laminated film exceeds 0.2 mm ² can be recognized. 7 positions are managed. Specifically, as shown in the manufacturing method of the 2nd winding body 2B mentioned later, etc., after laminating each layer and manufacturing a strip | belt-shaped laminated | multilayer film, before winding this, the area of a laminated | multilayer film is 0. The position of the indentation 7 is managed by providing a mark on the laminated film so that the position of the indentation 7 exceeding ² mm ² can be recognized. In the 2nd winding body 2B, since it manages so that the position of such an indentation 7 in a laminated | multilayer film can be recognized, not only the defect in the convex part formed in the coating layer 6, but sealant layer 4 of The defect position of the coating layer 6 in the vicinity of the convex part can also be easily recognized. Therefore, when the battery packaging material unwound from the second winding body 2B is cut out and used for sealing the battery element, a battery can be manufactured by avoiding a defective portion in the coating layer 6, The yield of battery manufacturing can be improved. In the second winding body 2 </ b> B, the mark attached so that the position of the convex portion can be recognized may be provided on the indentation 7 or may be provided in the vicinity of the indentation 7. Good. Moreover, such a mark can be provided using, for example, ink.

In the second wound body 2B, the length of the laminated film constituting the battery packaging material is not particularly limited, but may be, for example, 200 m or more, preferably about 200 to 600 m. The width of the laminated film is, for example, about 0.01 to 1 m, preferably about 0.1 to 1 m. The thickness of the laminated film is, for example, 200 μm or less, preferably about 50 to 200 μm, more preferably about 65 to 130 μm. In the roll-shaped second wound body, the diameter of the circular cross section in the direction perpendicular to the width direction of the laminated film is preferably 150 mm or more, more preferably 220 mm or more. In addition, the upper limit of the diameter of the circular section is usually about 350 mm.

2-4B. Manufacturing Method of Second Winding Body 2B The manufacturing method of the second winding body 2B is the same as the manufacturing method of the first winding body 1B until a laminated film is obtained.

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

Next, a winding process is performed in which the laminated film is wound so that the surface of the sealant layer 4 and the surface of the coating layer 6 are in contact with each other to obtain the second wound body 2B. The method for winding the laminated film is not particularly limited as long as the belt-like laminated film is wound in a roll shape, and may be wound on a roll or the like using a known film winder or the like.

3B. Defect inspection method B for battery packaging materials
The defect inspection method B for the battery packaging material of the second aspect B (hereinafter sometimes simply referred to as “defect inspection method B”) includes at least a coating layer formed of a two-component curable resin, and a base material layer A defect inspection method for a battery packaging material comprising a laminated film in which a metal layer and a sealant layer are laminated in this order, and the area when the surface of the sealant layer is imaged and viewed from the lamination direction of the laminated film Is the indentation exceeding 0.2 mm ^2, and the position information of the indentation protruding from the coating layer to the sealant layer or the indentation protruding from the sealant layer to the coating layer is recorded, and the area is 0. And a step of applying a mark to the laminated film so that the position of the indentation exceeding 2 mm ² can be recognized.

In the defect inspection method B, the configuration of the battery packaging material used for inspection is the same as the configuration of the battery packaging material constituting the first winding body 1B described above. However, the following points are different. That is, in the sealant layer 4 in the first wound body 1B, the number of indentations 7 having an area exceeding 0.2 mm ² when the laminated film is viewed from the lamination direction is the length of the laminated film having a width of 80 to 600 mm. While it is managed so that it is 1 or less per 100 m, such management is not performed in the battery packaging material which is the target of the defect inspection method B. Therefore, in the battery packaging material to be subjected to the defect inspection method B, the number of indentations 7 having an area exceeding 0.2 mm ² when the laminated film is viewed from the lamination direction is usually a laminated film having a width of 80 to 600 mm. More than one per 100m in length.

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

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

As described above, the position, size, number, and the like of the indentations 7 that cause defects in the coating layer 6 can be managed by the defect inspection method B. That is, for example, by applying the defect inspection method B to the battery packaging material, it is possible to manage such that the position of the indentation 7 in the laminated film can be recognized like the second winding body 2B. It becomes. By this management, not only the defect position at the convex portion of the indentation 7 formed on the coating layer 6 but also the defect position of the coating layer 6 generated in the vicinity of the convex portion when the sealant layer 4 has the convex portion is easy. Can be recognized. Therefore, when the battery packaging material unwound from the second winding body 2B is cut out and used for sealing the battery element, a battery can be manufactured by avoiding a defective portion in the coating layer 6, The yield of battery manufacturing can be improved.

Further, by applying the defect inspection method B, the indentation 7 that can be recognized by such a mark as in the first winding body 1B is within one per 100 m of a laminated film having a width of 80 to 600 mm. Can be removed. Therefore, by cutting out the battery packaging material unwound from the first winding body 1B and sealing the battery element, it is possible to suitably suppress the production of a battery having a defect in the coating layer 6. And the yield of battery manufacturing can be improved.

4B. Application of Winding Body B of Battery Packaging Material Winding body B of the battery packaging material of the second aspect B is the same as the application exemplified in the first aspect A.

(Third aspect C)
1C. Winding body 1C for first battery packaging material
The wound body 1C of the first battery packaging material of the third aspect C (hereinafter sometimes simply referred to as “first wound body 1C”) includes at least a base material layer, an adhesive layer, A winding body for battery packaging material comprising a laminated film in which a metal layer and a sealant layer are laminated in this order, and at the interface portion of at least two layers contained in the laminated film, from the lamination direction of the laminated film The number of foreign matters having an area of 0.4 mm ² or more when viewed is one or less per 100 m length of a laminated film having a width of 80 to 600 mm. Hereinafter, the wound body 1 </ b> C of the first battery packaging material will be described in detail with reference to FIGS. 7 and 8.

1-1C. Laminated structure of battery packaging material constituting the first winding body 1C The battery packaging material constituting the first winding body 1C is, for example, as shown in FIG. The layer 2, the metal layer 3, and the sealant layer 4 are made of a laminated film in which the layers are laminated in this order. As will be described later, the first winding body 1C is obtained by winding a battery packaging material in a roll shape. The first wound body 1C may be wound so that the sealant layer 4 of the battery packaging material is inside, or wound so that the base material layer 1 is inside. It may be.

The battery packaging material may include at least the base material layer 1, the adhesive layer 2, the metal layer 3, and the sealant layer 4, and may further include other layers. For example, as shown in FIGS. 7 and 8, the battery packaging material may have a coating layer 6 on the side opposite to the adhesive layer 2 of the base material layer 1 as necessary. In addition, as shown in FIG. 8, 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.

In the battery packaging material, the base material layer 1 or the coating layer 6 is the outermost layer, and the sealant layer 4 is the innermost layer. That is, when the battery is assembled, the battery element is wrapped with the battery packaging material so that the sealant layer 4 of the battery packaging material is on the inside of the battery, and the sealant layers 4 positioned at the periphery of the battery element are heat-welded. The battery element is sealed by sealing the battery element.

1-2C. Configuration of each layer of battery packaging material constituting first winding body 1C In the third aspect C, the configuration of each layer of battery packaging material constituting the first winding body 1C is the first aspect A. It is the same. However, in the third aspect C, the coating layer 6 is a layer provided as necessary. Further, the sealant layer 4 is different in terms of the following foreign matter 8.

[Foreign matter 8]
As described above, in the manufacturing process of the battery packaging material, when laminating each layer of the laminated film, the foreign matter adhering to the device or the foreign matter scattered in the air falls on the layer in the laminating step. In some cases, foreign matter may be included in the interface portion of the layer included in the laminated film by being laminated with the adjacent layer as it is. Moreover, the foreign material may adhere also to the resin film, metal foil, etc. which comprise each layer of a laminated | multilayer film. When a battery packaging material in which such foreign matter is present at the interface portion of the laminated film layer is molded, there are pinholes in the foreign matter part due to differences in elongation between the foreign matter part and other parts. It tends to occur. Among such foreign matters, the foreign matter 8 having an area of 0.4 mm ² or more when viewed from the lamination direction of the laminated film is particularly likely to cause pinholes at the time of molding, and if it is a foreign matter smaller than this, It is unlikely to cause pinholes. The number of foreign substances 8 having an area of 0.4 mm ² or more is generally one or more per 100 m of a laminated film having a width of 80 to 600 mm. On the other hand, in the first wound body 1C, as will be described later, the number of foreign matters 8 having an area of 0.4 mm ² or more is controlled to 1 or less per 100 m of a laminated film having a width of 80 to 600 mm. Has been.

In 3rd aspect C, the foreign material 8 whose area is 0.4 mm < ² > or more exists in the interface part of the at least 2 layer contained in a laminated | multilayer film. Such foreign matter 8 is at least an interface portion between the base material layer 1 and the adhesive layer 2, an interface portion between the adhesive layer 2 and the metal layer 3 as shown in FIG. 3 and the sealant layer 4. Further, when the adhesive layer 5 is provided, the adhesive layer 5 may exist at an interface portion between the metal layer 3 and the adhesive layer 5, an interface portion between the adhesive layer 5 and the sealant layer 4 in the adhesive layer 5, and the like. Furthermore, when the coating layer 6 is provided, foreign matter may be present at the interface portion between the coating layer 6 and the base material layer 1. Further, for example, when the sealant layer 4 is formed of a plurality of layers, the foreign matter 8 may also exist at an interface portion of at least two layers included in the sealant layer 4. In the present invention, the interface portion of each layer where foreign matter exists includes the interface and its vicinity, and the foreign matter existing at the interface portion includes not only foreign matter existing at the interface of the layer but also, for example, from the interface to the inside of the layer. Although it is buried in and located in the vicinity of the interface, it is not included in the interface. In addition, since the adhesive layer 2 and the adhesive layer 5 provided as necessary are usually formed very thin, there may be a case where foreign matter is present inside the adhesive layer 2 or the adhesive layer 5. The “interfacial portion of at least two layers” in C includes the adhesive layer 2 (inside the adhesive layer 2) and the adhesive layer 5 (inside the adhesive layer 5).

Among these interface portions in which the foreign matter 8 can be included, in particular, when the foreign matter 8 having an area of 0.4 mm ² or more exists in the interface portion between the adhesive layer 2 and the metal layer 3 or in the adhesive layer 2, a pinhole Is likely to occur. This is considered to be caused by a large difference in tensile strength between the base material layer 1 and the metal layer 3. Specifically, since the tensile strength of the base material layer 1 is usually larger than the tensile strength of the metal layer 3, the base material layer 1 and the metal layer 3 are laminated rather than the case where the metal layer 3 is formed alone. The tensile strength when molding the battery packaging material is increased. Therefore, due to the presence of the foreign matter 8 in the interface portion between the adhesive layer 2 and the metal layer 3 or in the adhesive layer 2, the adhesion between the base material layer 1 and the metal layer 3 is appropriate at the portion where the foreign matter 8 exists. Otherwise, when the battery packaging material is stretched by molding, a large force applied to the metal layer 3 is likely to cause pinholes in the portion of the metal layer 3 where the foreign matter 8 exists. .

Also, if foreign matter 8 exists between the metal layer 3 and the sealant layer 4, the metal layer 3 is damaged by the foreign matter 8 when the battery packaging material is molded, and pinholes are likely to occur.

Although it does not specifically limit as the foreign material 8, Generally, they are dust, a metal piece, the oligomer of the resin which forms the base material layer 1, a carbide | carbonized_material, etc. The thickness of the foreign material 8 having an area of 0.4 mm ² or more is usually 2 μm or more and 50 μm or less. In addition, the thickness of the foreign material 8 means the thickness of the foreign material 8 in the lamination direction of the laminated film.

1-3C. Configuration of First Winding Body 1C The first winding body 1C is configured by winding the battery packaging material (laminated film) in a roll shape. The first wound body 1C may be wound so that the sealant layer 4 of the battery packaging material is inside, or wound so that the base material layer 1 is inside. It may be.

In the first wound body 1C, the number of foreign matters having an area of 0.4 mm ² or more when viewed from the lamination direction of the laminated film at the interface portion of the at least two layers included in the laminated film is the width. The number is controlled to be 1 or less per 100 m length of a laminated film of 80 to 600 mm. Specifically, for example, as shown in the manufacturing method of the first wound body 1C described later, after each layer is laminated to produce a strip-like laminated film, the area is 0.4 mm ² before winding. Defects caused by foreign matter 8 at the time of molding by removing the portion where the above foreign matter is located from the laminated film so that the number of foreign matters 8 is one or less per 100 m of the laminated film having a width of 80 to 600 mm. The number of is managed. That is, in the first winding body 1C, the number of such foreign matters 8 is controlled to be 1 or less per 100 m of a laminated film having a width of 80 to 600 mm. The occurrence of defects that occur is suppressed. Therefore, by cutting out the battery packaging material unwound from the first winding body 1C and sealing the battery element, it is possible to suitably suppress the production of a battery having a pinhole. The manufacturing yield can be improved. As will be described later, in the first winding body 1C, the laminated film may be cut in the width direction so as to include the portion where the foreign matter 8 is located, and the laminated film may be connected with a tape or the like.

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

1-4C. Manufacturing Method of First Winding Body 1C The manufacturing method of the first winding body 1C is a method in which the above-described layers having a predetermined configuration are stacked, and a laminated film in which the number and size of foreign matters 8 are controlled is wound. As long as what is obtained is not particularly limited, for example, the following method can be exemplified.

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

Next, the foreign matter contained in the interface portion of at least two layers contained in the laminated film, where the foreign matter 8 having an area of 0.4 mm ² or more when viewed from the lamination direction of the laminated film is removed Then, a foreign matter removing step is performed in which the number of foreign matters 8 having an area of 0.4 mm ² or more is set to one or less per 100 m of a laminated film having a width of 80 to 600 mm. The size, position, and number of the foreign matter can be detected by, for example, a defect inspection method described later. That is, a step of imaging the surface of the laminated film and recording the position information of the foreign substance 8 having an area of 0.4 mm ² or more when viewed from the lamination direction of the laminated film, and the position of the foreign substance is recognized according to the position information. As can be done, the size, position, and number of the foreign substances can be grasped by performing the step of applying a mark to the laminated film. Next, in accordance with the obtained position information, the foreign matter 8 having an area of 0.4 mm ² or more is removed so that the number is 1 or less per 100 m of a laminated film having a width of 80 to 600 mm. The portion where the foreign matter 8 having an area of 0.4 mm ² or more is located may be cut out and removed only from the portion or the periphery thereof, or the laminated film may be cut in the width direction including the portion where the foreign matter 8 is located. The laminated film may be connected with a tape or the like.

Next, a winding process is performed in which the laminated film is wound to obtain the first wound body 1C. The method for winding the laminated film is not particularly limited as long as the belt-like laminated film is wound in a roll shape, and may be wound on a roll or the like using a known film winder or the like.

2C. Winding body 2C for second battery packaging material
The wound body 2C of the second battery packaging material (hereinafter sometimes simply referred to as “second wound body 2C”) includes at least a base material layer 1, an adhesive layer 2, and a metal layer 3. And a sealant layer 4 is a wound body of a packaging material for a battery made of a laminated film laminated in this order. In this case, a foreign matter having an area of 0.4 mm ² or more is present, and a mark is given to the laminated film so that the position of the foreign matter can be recognized. Hereinafter, the winding body 2C of the second battery packaging material will be described in detail.

2-1C. Layered structure of battery packaging material constituting second winding body 2C The battery packaging material constituting second winding body 2C is the battery packaging constituting first winding body 1C described above. It has a layered structure similar to the material. That is, for example, as shown in FIG. 7, at least a base material layer 1, an adhesive layer 2, a metal layer 3, and a sealant layer 4 are made of a laminated film laminated in this order.

2-2C. Configuration of each layer of battery packaging material constituting second winding body 2C Configuration of each layer of battery packaging material constituting second winding body 2C, that is, coating layer 6 provided as necessary, base The structure of the material layer 1, the adhesive layer 2, the metal layer 3, the adhesive layer 5 provided as necessary, and the sealant layer 4 are the layers of the battery packaging material constituting the first winding body 1C described above. It is the same as that of the structure. However, the number of foreign substances 8 having an area of 0.4 mm ² or more differs in the following points.

In the first winding body 1C described above, the number of foreign matters 8 having an area of 0.4 mm ² or more when viewed from the lamination direction is one per 100 m in length of the laminated film having a width of 80 to 600 mm. It is managed to be as follows. On the other hand, in the laminated film in the second winding body 2C, the number of foreign substances 8 having such a size is not necessarily managed, but the laminated film can recognize the position of the foreign substances 8. The position of the foreign object 8 is managed by adding a mark to the mark. Also in the second winding body 2C, it is preferable that the number is controlled to be 1 or less per 100 m of a laminated film having a width of 80 to 600 mm. Therefore, in the second wound body 2C, the number of foreign matters 8 having an area of 0.4 mm ² or more when the laminated film is viewed from the lamination direction is usually about 100 m of the laminated film having a width of 80 to 600 mm. One or less is preferred.

2-3. Configuration of Second Winding Body 2C The second winding body 2C is configured by winding the battery packaging material (laminated film) in a roll shape. Similarly to the first winding body 1C, the second winding body 2C may be wound so that the sealant layer 4 of the battery packaging material is on the inside. It may be wound so as to be inside.

In the second wound body ² </ ^b > C, the mark is given to the laminated film so that the position of the foreign substance 8 having an area as viewed from the lamination direction of the laminated film of 0.4 mm ² or more can be recognized. 8 positions are managed. Specifically, as shown in a manufacturing method of the second winding body 2C described later, etc., after laminating each layer to produce a belt-like laminated film, the area of the laminated film is 0 before winding the film. The position of the foreign matter 8 is managed by giving a mark to the laminated film so that the position of the foreign matter 8 of 4 mm ² or more can be recognized. That is, in the second winding body 2C, since the position of the foreign matter 8 in the laminated film is managed so that it can be recognized, the position of the defect caused by the foreign matter 8 during molding can be easily recognized. it can. Therefore, when the battery packaging material unwound from the second winding body 2C is cut out and used for sealing the battery element, the battery can be manufactured while avoiding the defective portion. Yield can be improved. In the second winding body 2 </ b> C, a mark attached so that the position of the foreign matter 8 can be recognized may be provided on the foreign matter 8 or may be provided in the vicinity of the foreign matter 8. Good. Moreover, such a mark can be provided using, for example, ink.

In the second winding body 2C, the length of the laminated film constituting the battery packaging material is not particularly limited, but is, for example, 200 m or more, preferably about 200 to 600 m. The width of the laminated film is, for example, about 0.01 to 1 m, preferably about 0.1 to 1 m. The thickness of the laminated film is, for example, 200 μm or less, preferably about 50 to 200 μm, more preferably about 65 to 130 μm. In the roll-shaped second winding body 2C, the diameter of the circular cross section in the direction perpendicular to the width direction of the laminated film is preferably 150 mm or more, more preferably 220 mm or more. In addition, the upper limit of the diameter of the circular section is usually about 350 mm.

2-4C. Manufacturing Method of Second Winding Body 2C The manufacturing method of the second winding body 2C is the same as the manufacturing method of the first winding body 1C until a laminated film is obtained.

Next, it is possible to recognize the position of the foreign material 8 included in the interface portion of at least two layers included in the laminated film and having an area of 0.4 mm ² or more when viewed from the lamination direction of the laminated film. Then, a mark applying step for applying a mark to the laminated film is performed. The size, position, and number of the foreign matter 8 can be detected by, for example, a defect inspection method C described later. That is, imaging the surface of the laminated film, recording the position information of the foreign material 8 having an area of 0.4 mm ² or more when viewed from the lamination direction of the laminated film, and the position of the foreign material 8 according to the position information A step of applying a mark to the laminated film so as to be recognized.

Next, a winding process is performed in which the laminated film is wound to obtain the second wound body 2C. The method for winding the laminated film is not particularly limited as long as the belt-like laminated film is wound in a roll shape, and may be wound on a roll or the like using a known film winder or the like.

3C. Defect inspection method C for battery packaging materials
The defect inspection method C for the battery packaging material in the third aspect C (hereinafter sometimes simply referred to as “defect inspection method C”) includes at least a base material layer 1, an adhesive layer 2, a metal layer 3, A defect inspection method for a battery packaging material comprising a laminated film in which the sealant layer 4 is laminated in this order, the surface of the laminated film is imaged, and is present at an interface portion of at least two layers included in the laminated film. The step of recording the position information of the foreign matter having an area of 0.4 mm ² or more when viewed from the lamination direction of the laminated film, and according to the position information, the position of the foreign matter having an area of 0.4 mm ² or more can be recognized. And a mark applying step for applying a mark to the laminated film.

In the defect inspection method C, the configuration of the battery packaging material used for inspection is the same as the configuration of the battery packaging material constituting the first winding body 1C described above. However, the number of foreign substances 8 having an area of 0.4 mm ² or more differs in the following points. That is, in the first wound body 1C, the number of foreign matters 8 having an area of 0.4 mm ² or more when viewed from the lamination direction is one per 100 m of the length of the laminated film having a width of 80 to 600 mm. In contrast to the following management, the battery packaging material that is the target of the defect inspection method C does not have such management. Therefore, in the battery packaging material to be subjected to the defect inspection method C, the number of foreign matters 8 having an area of 0.4 mm ² or more when the laminated film is viewed from the lamination direction is the length of the laminated film having a width of 80 to 600 mm. There may be one or more per 100 m.

In the defect inspection method C, first, the surface of the laminated film 4 of such a battery packaging material is imaged using a camera or the like, and the area when viewed from the lamination direction of the laminated film is 0.4 mm ² or more. A recording process for recording position information of the foreign material 8 is performed. At this time, it is preferable to record information such as the size and height of the foreign matter 8. Such a recording process for recording the positional information of the foreign matter 8 can be performed by using a known defect inspection apparatus used for defect inspection such as fish eye in the film. A commercial item can be used as such a defect inspection apparatus.

Next, in accordance with the position information obtained in the recording process, a mark applying process for applying a mark to the laminated film is performed so that the position of the foreign material 8 having an area of 0.4 mm ² or more can be recognized. The position of the mark is not particularly limited as long as it is given so that the position of the foreign object 8 can be recognized. May be. Such a mark application process can also be performed by using a known defect inspection apparatus as described above. The type of the mark is not particularly limited as long as the position can be recognized. For example, an ink or the like used for a general film defect inspection apparatus can be used in the present invention.

The defect inspection method C makes it possible to manage the position, size, number, etc., of the foreign matter 8 of the laminated film having defects that cause pinholes as described above. That is, for example, by applying the defect inspection method C to the battery packaging material, it is possible to manage such that the position of the foreign matter 8 in the laminated film can be recognized as in the second winding body 2C. Thus, it is possible to easily recognize the position of the defect caused by the foreign material 8 during molding. Therefore, when the battery packaging material unwound from the second winding body 2C is cut out and used for sealing the battery element, a battery is manufactured while avoiding a defective portion that causes pinholes. And the yield of battery manufacturing can be improved.

Further, by applying the defect inspection method C, the foreign matter 8 of the sealant layer 4 that can be recognized by such a mark as in the first winding body 1C is removed per 100 m of a laminated film having a width of 80 to 600 mm. It can be removed so that it becomes 1 or less. Therefore, by cutting out the battery packaging material unwound from the first winding body 1C and sealing the battery element, it is preferable to suppress the manufacture of a battery having a defect that causes pinholes. Thus, the yield of battery manufacturing can be improved.

4C. Application of Winding Body C of Battery Packaging Material Winding body C of the battery packaging material of the third aspect C is the same as the application exemplified in the first aspect A.

Hereinafter, the present invention will be described in detail with reference to examples. However, the present invention is not limited to the examples. Examples are shown in the order of the first aspect A, the second aspect B, and the third aspect C.

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

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

[Defect inspection of battery packaging material A]
With respect to the battery packaging material obtained above, using a commercially available film defect inspection device, the position information of the convex portion whose area viewed from the lamination direction of the laminated film is in the range of 0.03 to 3.1 mm ² is recorded. In order to recognize the position, a mark was given in the vicinity of these convex portions.

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

Battery packaging material No. For each of the rolls of 1A to 12A, the number of convex portions having an area exceeding 0.4 mm ² per 100 m, the number of shots obtained from the roll, the number of defective shots, the ratio of defective shots, the roll Table 1A shows the size of the molded part formed in the battery packaging material as a result of the determination as to whether or not it can be made into a product. Note that a shot is a unit of battery packaging material required to produce one battery. In 1A to 12A, a length of 100 mm was taken as one shot. Thus, for example, from the battery packaging material length 500 meters, although the battery packaging material for producing 5000 cells theoretical (5000 shots) are obtained, protrusion area exceeds 0.4 mm ² is The shot that is positioned is defective. Since a wound body with many defective shots greatly reduces the production efficiency of the battery, in order to use the wound body as a product, the number of convex portions having an area per 100 m of laminated film exceeding 0.4 mm ² is 1 It is desirable to manage less than one. Further, a battery element is placed in the molded part of the battery packaging material in the battery manufacturing process.

In the product feasibility determination in Table 1A, “◯” was given when there were few defects and the wound body could be used as a product as it was, and “X” when there were many defects and the wound body could not be used as a product as it was.

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

From the results shown in Table 2A, it has been clarified that when the convex portion having an area of 0.4 mm ² or less in the sealant layer is in contact with the coating layer, the resistance to the electrolytic solution does not decrease. On the other hand, it is clear that when the convex part having an area of 0.4 mm ² or more in the sealant layer is in contact with the coating layer, the coating layer is damaged, the base material layer is exposed, and the electrolytic solution resistance is lowered. became. From this result, in the wound body of the battery packaging material A, the battery packaging with reduced electrolyte solution resistance is managed by controlling the size of the protrusions in the sealant layer so that the area is 0.4 mm ² or less. It can be seen that production of a battery using the material can be preferably avoided, and the production efficiency of the battery can be improved.

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

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

[Defect inspection of battery packaging material B]
For the battery packaging material B obtained above, using a commercially available film defect inspection device, the position information of the indentation in which the area viewed from the lamination direction of the laminated film is in the range of 0.03 to 3.1 mm ² is recorded. A mark was given in the vicinity of these indentations so that the position could be recognized. The indentation formed on the laminated film included both the indentation protruding from the coating layer to the sealant layer and the indentation protruding from the sealant layer to the coating layer.

[Production of Winding Body B for Battery Packaging Material]
In the same manner as described above, the battery packaging material No. 1B to 12B were produced. Next, using a commercially available film winder, the battery packaging material No. 1B to 12B were wound so that the surface of the sealant layer and the surface of the coating layer were in contact with each other so that the sealant layer was on the inside.

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

In the product availability determination shown in Table 1B, “○” was given when there were few defects and the wound body could be used as a product as it was, and “X” when there were many defects and the wound body could not be used as a product as it was.

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

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

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

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

Next, the resin component (mixed resin of acid-modified polypropylene resin and propylene resin) that forms the sealant layer 4 on the metal layer 3 side of the laminate is extruded in a molten state (250 ° C.), thereby the sealant on the metal layer 3. Layer 4 (thickness 45 μm) was laminated. Thus, a belt-shaped battery packaging material C composed of a laminated film in which the base material layer 1 / adhesive layer 2 / metal layer 3 / sealant layer 4 were laminated in order was obtained.

[Defect inspection of battery packaging material C]
For the battery packaging material C obtained above, using a commercially available film defect inspection device, record the position information of the foreign matter whose area viewed from the lamination direction of the laminated film is in the range of 0.03 to 3.1 mm ^2. In order to recognize the position, a mark was given in the vicinity of these foreign substances.

[Measurement of the number of pinholes generated by molding A]
The battery packaging material C has a size of 100 mm × 100 mm so that one foreign matter having the size shown in Table 1C is located at the center from the position of the mark of the battery packaging material C obtained above. C was cut out to make a test sample. As the test sample, a sample in which foreign matter was present at the interface portion (including the inside of the adhesive layer) between the adhesive layer and the metal layer was used. Next, a straight mold composed of a 20 × 30 mm rectangular male mold and a female mold with a clearance of 0.5 mm between the male mold and the female mold so that the thermal adhesive resin layer side is located on the male mold side. The test sample was placed on top, and the test sample was pressed with a presser pressure (surface pressure) of 0.4 MPa so as to have a molding depth of 6 mm, and cold-molded (drawn one-stage molding). The presence or absence of pinholes in the metal layer in the molded battery packaging material C was confirmed, and the number of pinholes generated was measured. The number of occurrences of pinholes is determined as follows: moldings with pinholes recognized after molding are identified as defective moldings (x), and those with no pinholes identified as moldings with good moldings (◯). The presence or absence of pinholes was confirmed. The results are shown in Table 1C.

[Measurement of the number of pinholes generated by molding B]
From the position of the mark of the battery packaging material C obtained as described above, two foreign matters each having the size shown in Table 2C (both of which include the interface portion between the adhesive layer and the metal layer (including the adhesive layer)) Except that the battery packaging material C was cut into a size of 100 mm × 100 mm and used as test samples, and the number of test samples was 5 respectively. In the same manner as in measurement A, the number of pinholes generated by molding was measured. The results are shown in Table 2C.

[Measurement of the number of pinholes generated by molding C]
In the production of the battery packaging material C, except that a sealant layer in which two layers of a carboxylic acid-modified polypropylene layer (22.5 μm) and a polypropylene layer (22.5 μm) were laminated in this order from the metal layer side was used. Battery packaging material C was produced in the same manner as described above. About the battery packaging material C obtained here, the mark was provided in the vicinity of the foreign material in the same manner as the defect inspection described above. Next, from the position of the obtained mark, a foreign matter having a size described in Table 3C (located at the interface portion between the sealant layer and the metal layer) is positioned at the center portion, and the size is 100 mm × 100 mm. The number of pinholes generated by molding was measured in the same manner as in measurement A, except that the battery packaging material was cut into a test sample. The results are shown in Table 3C.

[Measurement of the number of pinholes generated by molding D]
From the position of the mark of the battery packaging material C obtained above, two foreign substances (each located at the interface between the sealant layer and the metal layer) each having the size shown in Table 4C are located in the center portion. In the same manner as in the above measurement A, except that the battery packaging material C was cut to a size of 100 mm × 100 mm to obtain a test sample and the number of test samples was five. The number of pinholes was measured. The results are shown in Table 4C.

From the results shown in Tables 1C to 4C, it was found that when a foreign matter having an area smaller than 0.4 mm ² is present at the interface portion of the laminated film, pinholes due to molding hardly occur. On the other hand, if the area is is 0.4 mm ² or more foreign material present at the interface portion of the laminated film, pinholes molding revealed that prone. From this result, in the winding body C of the battery packaging material, pinholes are likely to occur by managing the size of the foreign matter present at the interface portion of the laminated film so that the area is 0.4 mm ² or less. It turns out that manufacturing a battery using the packaging material C for batteries can be suitably avoided, and the production efficiency of the battery can be improved.

[Manufacture of winding material CA for battery packaging material]
In the same manner as in the production of the battery packaging material and the defect inspection described above, the battery packaging material No. 1CA to 12CA were produced. Next, using a commercially available film winder, the battery packaging material No. 1CA to 12CA were wound up so that the sealant layer was inside. Battery packaging material No. As 1CA to 12CA, the laminated films produced by the above-described method were selected with foreign matters present at the interface portion (including the inside of the adhesive layer) between the adhesive layer and the metal layer.

Battery packaging material No. For the winding bodies of 1CA to 12CA, the number of foreign matter having an area of 0.4 mm ² or more per 100 m of laminated film, the number of shots obtained from the winding body, the number of defective shots, the ratio of defective shots, the winding body, Table 5C shows the size of the molded part formed on the battery packaging material as a result of the determination as to whether or not the product can be obtained. Note that a shot is a unit of battery packaging material required to produce one battery. In 1CA to 12CA, a length of 100 mm was taken as one shot. Therefore, for example, a battery packaging material (5000 shots) for producing 5000 batteries in theory can be obtained from a battery packaging material having a length of 500 m, but a foreign matter having an area of 0.4 mm ² or more is located. A shot to be performed becomes defective. Winding bodies with many defective shots greatly reduce the production efficiency of the battery. Therefore, in order to use the winding body as a product, the number of foreign matters having an area per 100 m of laminated film of 0.4 mm ² or more is one. It is desirable to manage the following. Further, a battery element is placed in the molded part of the battery packaging material in the battery manufacturing process.

In the product adequacy determination in Table 1C, when there are few defects and the wound body can be used as a product as it is, (◯), and when there are many defects and the wound body cannot be used as a product as it is, it is evaluated as (×).

[Production of Winding Body CB for Battery Packaging Material]
In the same manner as described above, each of the battery packaging material No. 1CB to 12CB were prepared. Next, using a commercially available film winder, the battery packaging material No. 1 CB to 12 CB were rolled up with the sealant layer on the inside. Battery packaging material No. As 1CB to 12CB, among the laminated films produced by the above method, those having foreign matters present at the interface portion between the metal layer and the sealant layer were selected.

Battery packaging material No. For the rolls of 1CB to 12CB, the number of foreign matter having an area of 0.4 mm ² or more per 100 m of laminated film, the number of shots obtained from the roll, the number of defective shots, the ratio of defective shots, Table 6C shows the size of the molded part formed in the battery packaging material as a result of the determination as to whether or not the product can be obtained.

DESCRIPTION OF SYMBOLS 1 ... Base material layer 2 ... Adhesive layer 3 ... Metal layer 4 ... Sealant layer 5 ... Adhesive layer 6 ... Coating layer 7 ... Indentation 8 ... Foreign material

Claims

At least a winding body for a battery packaging material comprising a laminated film in which a coating layer, a base material layer, a metal layer, and a sealant layer are laminated in this order,
The coating layer is formed of a two-component curable resin,
The sealant layer is formed of a melt-extruded thermoplastic resin,
The sealant layer includes foreign matter or an unmelted material of the thermoplastic resin,
On the surface of the sealant layer, it is possible to recognize the position of a convex portion caused by the foreign matter or the unmelted material, and having an area that exceeds 0.4 mm 2 when viewed from the lamination direction of the laminated film. In addition, a mark is given to the laminated film,
The wound body is a wound body for a battery packaging material wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other.
The winding body for a battery packaging material according to claim 1, wherein the coating layer has a thickness of 5 µm or less.
The wound body for battery packaging material according to claim 1 or 2, wherein the thickness of the laminated film is 200 µm or less.
The wound body for battery packaging material according to any one of claims 1 to 3, wherein the height of the convex portion is 2 µm or more.
The wound body of a battery packaging material according to any one of claims 1 to 4, wherein the wound body has a roll shape in which the length of the laminated film is 200 m or more and the diameter of a circular cross section is 150 mm or more.
A method for producing a wound body of a battery packaging material according to any one of claims 1 to 5,
Forming a metal layer on one surface of the substrate layer;
A step of melt-extruding a thermoplastic resin on the metal layer to form the sealant layer;
Applying the two-component curable resin to the surface of the base material layer opposite to the metal layer to form the coating layer;
After obtaining a laminated film by a laminating process including:
In the laminated film, the position of the convex part due to the foreign matter or the unmelted material contained in the sealant layer, the area when viewed from the lamination direction of the laminated film exceeds 0.4 mm 2 So that the mark can be recognized on the laminated film,
Winding the laminated film so that the surface of the sealant layer and the surface of the coating layer are in contact with each other, and obtaining a winding body;
The manufacturing method of the winding body of the packaging material for batteries provided with this.
At least a winding body for a battery packaging material comprising a laminated film in which a coating layer, a base material layer, a metal layer, and a sealant layer are laminated in this order,
The coating layer is formed of a two-component curable resin,
The sealant layer is formed of a melt-extruded thermoplastic resin,
The sealant layer includes foreign matter or an unmelted material of the thermoplastic resin,
On the surface of the sealant layer, the number of convex portions due to the foreign matter or the unmelted material, and having an area that exceeds 0.4 mm 2 when viewed from the lamination direction of the laminated film, has a width of 80. Up to one per 100 m length of the laminated film of ~ 600 mm,
The wound body is a wound body for a battery packaging material wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other.
The winding body for battery packaging material according to claim 7, wherein the coating layer has a thickness of 5 µm or less.
The winding body for battery packaging material according to claim 7 or 8, wherein the thickness of the laminated film is 200 µm or less.
10. The wound body of battery packaging material according to claim 7, wherein the height of the convex portion is 2 μm or more.
11. The wound body of a battery packaging material according to claim 7, wherein the wound body has a roll shape in which the length of the laminated film is 200 m or more and the diameter of a circular cross section is 150 mm or more.
A method for producing a wound body of a battery packaging material according to any one of claims 7 to 11,
Forming a metal layer on one surface of the substrate layer;
A step of melt-extruding a thermoplastic resin on the metal layer to form the sealant layer;
Applying the two-component curable resin to the opposite side of the base material layer from the metal layer to form the coating layer;
After obtaining a laminated film by a laminating process including:
In the laminated film, a convex portion due to the foreign matter or the unmelted material contained in the sealant layer, and a convex portion whose area when viewed from the lamination direction of the laminated film exceeds 0.4 mm 2 is located. Removing the portion to be removed, the number of the protrusions whose area exceeds 0.4 mm 2 to be within one per 100 m length of the laminated film having a width of 80 to 600 mm,
Winding the laminated film so that the surface of the sealant layer and the surface of the coating layer are in contact with each other, and obtaining a winding body;
The manufacturing method of the winding body of the packaging material for batteries provided with this.
7. The battery according to claim 6, further comprising a step of providing a mark on the laminated film so that a position of the convex part in which the area of the laminated film exceeds 0.4 mm 2 can be recognized in the convex part removing step. A method for manufacturing a wound body of packaging material.
At least a coating layer formed of a two-component curable resin, a base material layer, a metal layer, and a sealant layer formed of a melt-extruded thermoplastic resin and containing foreign matter or an unmelted product of the thermoplastic resin; Is a defect inspection method for battery packaging materials consisting of laminated films laminated in this order,
Imaging the surface of the sealant layer, the steps of the area when viewed from the laminating direction of the laminated film is more than 0.4 mm 2, and records the position information of the convex portions due to the foreign matter or the unmelted material,
In accordance with the position information, the step of providing a mark on the laminated film so that the position of the convex portion having an area exceeding 0.4 mm 2 can be recognized;
A defect inspection method for battery packaging materials.
At least a winding body for a battery packaging material comprising a laminated film in which a coating layer, a base material layer, a metal layer, and a sealant layer are laminated in this order,
The coating layer is formed of a two-component curable resin,
The laminated film has an indent protruding from the coating layer to the sealant layer, or an indent protruding from the sealant layer to the coating layer,
A mark is given to the laminated film so that the position of the indentation when the area seen from the lamination direction of the laminated film exceeds 0.2 mm 2 can be recognized.
The wound body is a wound body for a battery packaging material wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other.
The winding body for battery packaging material according to claim 15, wherein the coating layer has a thickness of 5 μm or less.
The wound body for battery packaging material according to claim 15 or 16, wherein the laminated film has a thickness of 200 µm or less.
The wound body for a battery packaging material according to any one of claims 15 to 17, wherein a height of the indent protruding toward the sealant layer is 2 µm or more.
The wound body of a battery packaging material according to any one of claims 15 to 18, wherein the wound body has a roll shape in which the length of the laminated film is 200 m or more and the diameter of a circular cross section is 150 mm or more.
A method for producing a wound body of a battery packaging material according to any one of claims 15 to 19,
A step of laminating a base material layer, a metal layer, and a sealant layer;
Applying the two-component curable resin to the surface of the base material layer opposite to the metal layer to form the coating layer;
After obtaining a laminated film by a laminating process including:
Indentation protruding from the coating layer to the sealant layer, or indentation protruding from the sealant layer to the coating layer, where the area when viewed from the lamination direction of the laminated film exceeds 0.2 mm 2 So that the mark can be recognized on the laminated film,
Winding the laminated film so that the surface of the sealant layer and the surface of the coating layer are in contact with each other, and obtaining a winding body;
The manufacturing method of the winding body of the packaging material for batteries provided with this.
At least a winding body for a battery packaging material comprising a laminated film in which a coating layer, a base material layer, a metal layer, and a sealant layer are laminated in this order,
The coating layer is formed of a two-component curable resin,
The laminated film has an indent protruding from the coating layer to the sealant layer, or an indent protruding from the sealant layer to the coating layer,
On the surface of the laminated film, the number of indentations having an area exceeding 0.2 mm 2 when viewed from the lamination direction of the laminated film is within 1 per 100 m of the laminated film having a width of 80 to 600 mm,
The wound body is a wound body for a battery packaging material wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other.
The wound body for a battery packaging material according to claim 21, wherein the coating layer has a thickness of 5 µm or less.
The wound body for battery packaging material according to claim 21 or 22, wherein the laminated film has a thickness of 200 µm or less.
The battery packaging material winder according to any one of claims 21 to 23, wherein a height of the indentation protruding toward the sealant layer is 2 µm or more.
The wound body of battery packaging material according to any one of claims 21 to 24, wherein the wound body is a roll having a length of the laminated film of 200 m or more and a circular cross-sectional diameter of 150 mm or more.
A method for manufacturing a wound body of a battery packaging material according to any one of claims 21 to 25,
A step of laminating a base material layer, a metal layer, and a sealant layer;
Applying the two-component curable resin to the surface of the base material layer opposite to the metal layer to form the coating layer;
After obtaining a laminated film by a laminating process including:
An indentation projecting from the coating layer to the sealant layer, or an indentation projecting from the sealant layer to the coating layer, where the area when viewed from the lamination direction of the laminated film exceeds 0.2 mm 2 is located Removing the portion to make the number of indentations having an area of more than 0.2 mm 2 within one per 100 m length of the laminated film having a width of 80 to 600 mm,
Winding the laminated film so that the surface of the sealant layer and the surface of the coating layer are in contact with each other, and obtaining a winding body;
The manufacturing method of the winding body of the packaging material for batteries provided with this.
27. The battery packaging material according to claim 26, further comprising a step of providing a mark on the laminated film so that the position of the indentation in which the area of the laminated film exceeds 0.2 mm 2 can be recognized in the indentation removing step. Manufacturing method of the wound body of
A defect inspection method for a battery packaging material comprising a laminated film in which at least a coating layer formed of a two-component curable resin, a base material layer, a metal layer, and a sealant layer are laminated in this order,
The surface of the sealant layer is imaged, and the area when viewed from the lamination direction of the laminated film is an indentation exceeding 0.2 mm 2 , and is an indentation protruding from the coating layer to the sealant layer, or from the sealant layer Recording the position information of the indentation protruding to the coating layer;
In accordance with the position information, a step of providing a mark on the laminated film so that the position of the indentation in which the area exceeds 0.2 mm 2 can be recognized;
A defect inspection method for battery packaging materials.
At least a wound body of a battery packaging material comprising a laminated film in which a base material layer, an adhesive layer, a metal layer, and a sealant layer are laminated in this order,
In the interface portion of at least two layers included in the laminated film, there are foreign matters having an area of 0.4 mm 2 or more when viewed from the lamination direction of the laminated film,
A wound body of a battery packaging material in which a mark is given to the laminated film so that the position of the foreign matter can be recognized.
The foreign matter is present at least in an interface portion between the base material layer and the adhesive layer, in the adhesive layer, in an interface portion between the adhesive layer and the metal layer, or in an interface portion between the metal layer and the sealant layer. 30. A wound body of a battery packaging material according to claim 29.
The wound body of a battery packaging material according to claim 29 or 30, wherein the sealant layer is formed of a plurality of layers, and the foreign matter is present at an interface portion between the metal layer and the sealant layer.
The laminated film has a coating layer on the side opposite to the adhesive layer of the base material layer,
The wound body for a battery packaging material according to any one of claims 29 to 31, wherein the foreign matter is present at an interface portion between the coating layer and the base material layer.
The wound body of a battery packaging material according to any one of claims 29 to 32, wherein the wound body has a roll shape in which the length of the laminated film is 200 m or more and the diameter of a circular cross section is 150 mm or more.
A method for producing a wound body of a battery packaging material according to any one of claims 29 to 33,
After obtaining a laminated film by a laminating step of laminating a base material layer, an adhesive layer, a metal layer, and a sealant layer,
The foreign matter contained in the interface part of at least two layers contained in the laminated film, the area when viewed from the lamination direction of the laminated film can recognize the position of the foreign matter of 0.4 mm 2 or more, A mark applying step for applying a mark to the laminated film;
Winding the laminated film to obtain a wound body; and
The manufacturing method of the winding body of the packaging material for batteries provided with this.
At least a wound body of a battery packaging material comprising a laminated film in which a base material layer, an adhesive layer, a metal layer, and a sealant layer are laminated in this order,
The length of the laminated film having a width of 80 to 600 mm at the interface part of at least two layers contained in the laminated film, the number of foreign matters having an area of 0.4 mm 2 or more when viewed from the lamination direction of the laminated film The winding body of the packaging material for batteries which is 1 or less per 100 m.
The foreign matter is present at least in an interface portion between the base material layer and the adhesive layer, in the adhesive layer, in an interface portion between the adhesive layer and the metal layer, or in an interface portion between the metal layer and the sealant layer. The wound body for battery packaging material according to claim 35.
The wound body for a battery packaging material according to claim 35 or 36, wherein the sealant layer is formed of a plurality of layers, and the foreign matter is present at an interface portion between the metal layer and the sealant layer.
The laminated film has a coating layer on the side opposite to the adhesive layer of the base material layer,
The wound body for a battery packaging material according to any one of claims 35 to 37, wherein the foreign matter is present at an interface portion between the coating layer and the base material layer.
The wound body of a battery packaging material according to any one of claims 35 to 38, wherein the wound body is a roll having a length of the laminated film of 200 m or more and a circular cross-sectional diameter of 150 mm or more.
A method for producing a wound body of a battery packaging material according to any one of claims 35 to 39,
After obtaining a laminated film by a laminating step of laminating a base material layer, an adhesive layer, a metal layer, and a sealant layer,
The foreign matter contained in the interface portion of at least two layers contained in the laminated film, the portion when the foreign matter having an area of 0.4 mm 2 or more when viewed from the lamination direction of the laminated film is removed, A foreign matter removing step of reducing the number of foreign matters having an area of 0.4 mm 2 or more to one or less per 100 m of the laminated film having a width of 80 to 600 mm;
Winding the laminated film to obtain a wound body; and
The manufacturing method of the winding body of the packaging material for batteries provided with this.
41. The battery according to claim 40, further comprising a mark applying step of applying a mark to the laminated film so that the position of the foreign material having the area of the laminated film of 0.4 mm 2 or more can be recognized in the foreign matter removing step. A method for manufacturing a wound body of packaging material.
At least a defect inspection method for a battery packaging material comprising a laminated film in which a base material layer, an adhesive layer, a metal layer, and a sealant layer are laminated in this order,
The surface of the laminated film is imaged, and the position information of foreign matters having an area of 0.4 mm 2 or more when viewed from the laminating direction of the laminated film is present at an interface portion of at least two layers included in the laminated film. Recording process;
In accordance with the position information, a mark applying step for applying a mark to the laminated film so that the position of the foreign matter having an area of 0.4 mm 2 or more can be recognized;
A defect inspection method for battery packaging materials.