KR20160064179A - Rolled body of battery packaging material - Google Patents

Abstract

The present invention relates to a wrapping material for a battery packaging material comprising a laminated film in which at least a coating layer, a base layer, a metal layer and a sealant layer are laminated in this order, wherein the coating layer is formed of a two- Wherein the sealant layer is formed of a melt-extruded thermoplastic resin, and the sealant layer comprises a foreign substance or an unmelted material of the thermoplastic resin, wherein on the surface of the sealant layer, a convexity caused by the foreign matter or the non- A mark is provided on the laminated film so that the position of the convex portion having an area of more than 0.4 mm 2 when viewed from the lamination direction of the laminated film can be recognized, And a surface of the coating layer is wound so as to come into contact with the surface of the coating layer. This makes it possible to appropriately manage defects in the coating layer.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a battery pack,

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

Conventionally, various types of batteries have been developed. In these cells, a battery element composed of an electrode, an electrolyte or the like needs to be sealed with a packaging material or the like. As packaging materials for batteries, metal packaging materials have been widely used.

2. Description of the Related Art In recent years, batteries having various shapes have been demanded with high performance of electric vehicles, hybrid electric vehicles, personal computers, cameras, mobile phones, and the like. In addition, the battery is required to be thinner, lighter, and the like. However, it is difficult to follow the diversity of the battery shape in the metal packaging material conventionally widely used. In addition, since it is made of metal, there is a limit to the weight reduction of the packaging material.

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

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

Such a packaging material for a battery is generally produced as a belt-like laminated film in a production line, and is stored, transported, or the like as a roll wound in a roll shape. At the time of manufacturing the battery, the battery packaging material is taken out from the winding body and cut to a predetermined shape according to the product specifications of the battery.

Japanese Patent Application Laid-Open No. 2008-287971

When a battery is manufactured using the above-described packaging material for a battery, an electrolyte may adhere to a base material layer located on the outermost layer surface of the packaging material for a battery. When the electrolyte solution adheres to the base layer, the base layer may be discolored, so that a coating layer having electrolyte resistance or the like may be provided on the base layer. In addition, in recent years, with the demand for thinning and miniaturization of batteries, it is required to make the thickness of each layer of the packaging material for a battery as thin as possible. For this reason, such a coating layer is also formed to be very thin, for example, 5 mu m or less.

In a packaging material for a battery having such a thin coating layer, even when fine defects (defects) are present on the surface of the coating layer, the substrate layer is exposed from the defects. If an electrolyte comes in contact with a portion where the base layer is exposed, the part becomes defective due to discoloration or the like. Therefore, when a battery is manufactured using a cell packaging material having a minute defect in the coating layer, defects in the coating layer may be found only when electrolyte is adhered to the coating layer during the manufacturing process of the cell, and discoloration occurs. As a result, when the packaging material for a battery is cut out from a winding material of a packaging material for a battery in which defects of the coating layer are not managed, the yield of the battery production may be lowered when it is used for producing a battery.

The first aspect A and the second aspect B of the present invention are inventions made in view of such a problem. That is, the first and second forms A and B are disposed on the outermost layer of the wrapping material for a battery packaging material, the method for manufacturing the wrapping material, and the packaging material for a battery in which defects of the coating layer located on the outermost layer are appropriately managed The present invention also provides a method for inspecting defects in a coating layer.

In addition, a packaging material for a battery is usually molded and used in order to contain a battery element such as an electrolytic solution and an electrode. However, in this molding, pinholes are generated in the stretched portion of the packaging material for a battery, and the insulating property of the packaging material for a battery is lowered in some cases. In the case of manufacturing a battery using a packaging material for a cell which generates such a pinhole, pinholes are found only when the packaging material for a battery is formed in a manufacturing process of the battery. As a result, in the case where a packaging material for a battery is cut out from a winding material of a packaging material for a battery in which a defect causing pinholes is not managed and used for manufacturing a battery, the yield of battery production may be lowered.

The third embodiment C of the present invention is an invention made in view of such a problem. That is, the third mode C is for the main purpose of providing a winding material of a packaging material for a battery in which defects causing pinholes are appropriately managed, a manufacturing method of the winding material, and a defect inspection method for a packaging material for a battery do.

The inventor of the present invention has conducted intensive studies to solve the above-described problems of the first and second forms A and B of the present invention. As a result, it was found that after the battery packaging material was produced as a roll-shaped winding material, the battery packaging material was taken out from the winding material and used for manufacturing the battery, defects were generated in the coating layer for some reason I found out. The present inventors have further investigated the reason for this reason and found that when the coating layer is formed of a two-liquid curable resin and the sealant layer is formed by melt-extruded thermoplastic resin, the coating layer of the laminated film Is formed on the opposite side of the sealant layer with a low frequency of occurrence of a foreign object or a convexity caused by an unmelted material of the thermoplastic resin or the like and when the size of the convex portion exceeds a certain size, When the laminated film is wound so that the surface of the coating layer is brought into contact with the surface of the sealant layer, the protrusions on the surface of the sealant layer are pressed against the coating layer, and a defect is generated in the thin coating layer. In the case where the coating layer is formed by the two-liquid curing type resin, the two-liquid curing type resin may be applied onto the substrate layer and then wound before being completely cured. Therefore, , Especially the fact that deficits tend to occur.

The inventors of the present invention have found that a coating material for a battery packaging material comprising a laminated film in which at least a coating layer, a base layer, a metal layer and a sealant layer are laminated in this order, wherein the coating layer is formed of a two- Wherein the sealant layer is formed of a melt-extruded thermoplastic resin and the sealant layer comprises a foreign matter or an unmelted material of the thermoplastic resin, and in the case of the following (1A) or (2A) And the surface of the coating layer are brought into contact with each other so that the defects of the coating layer can be appropriately managed. The first embodiment A of the present invention is a invention completed by further examination based on these findings.

(1A) The number of protrusions having an area of 0.4 mm < 2 > when viewed from the lamination direction of the laminated film, the number of protrusions due to foreign matter or unmelted material on the surface of the sealant layer, In case of less than 1 per 100m length.

(2A) In order to recognize the positions of convex portions having an area larger than 0.4 mm 2 as viewed from the stacking direction of the laminated films, the convex portions caused by foreign matter or unmelted material on the surface of the sealant layer Is given.

Further, in the case where the coating layer is formed of a two-liquid curable resin, the present inventors have found that, when an indentation protruding from the coating layer of the laminated film to the sealant layer is present, the convexity due to the indentation is formed at a low occurrence frequency When the laminated film is wound such that the surface of the sealant layer and the surface of the coating layer come into contact with each other when the indentation (convex portion) size exceeds a certain size, the convex portions on the surface of the sealant layer are pressed against the coating layer , We have also found that a thin coat layer is defective. It is considered that such an indentation was formed by a slight contact of the laminated film with the apparatus or the like in the manufacturing process.

The present inventor has further investigated further that, contrary to the above, when there is an indentation protruding from the sealant layer to the coating layer, the size of the indentation (convexity) in the convexity due to the indentation of the coating layer The thickness of the coating layer in the convex portion becomes thin and the laminated film is wound such that the surface of the sealant layer and the surface of the coating layer are in contact with each other. To find out that a defect occurs in the convex portion of the coating layer.

In the case where the coating layer is formed by the two-liquid curing type resin, the two-liquid curing type resin may be applied onto the substrate layer and then wound before being completely cured. Therefore, , In particular, it is clear that defects tend to occur.

The inventor of the present invention has found that a coating film for a battery packaging material comprising a laminated film in which at least a coating layer, a base layer, a metal layer and a sealant layer are laminated in this order is formed by a two-liquid curable resin , The laminated film has an indentation protruding from the coating layer to the sealant layer or an indentation protruding from the sealant layer to the coating layer. In the case of the following (1B) or (2B) It is possible to appropriately manage the defects of the coating layer by using the wrapping material for the wrapping material for a battery which is wound so as to be brought into contact with each other. The second form B of the present invention is a invention completed by further examination based on this knowledge.

(1B) On the surface of the laminated film, the number of indentations having an area of more than 0.2 mm 2 when viewed from the lamination direction of the laminated film is not more than 1 per 100 m of the laminated film having a width of 80 to 600 mm.

(2B) A mark is provided on the laminated film so that the position of the indentation exceeding 0.2 mm 2 when viewed from the lamination direction of the laminated film can be recognized.

Further, the present inventors have conducted extensive studies in order to solve the above-described problems with respect to the third embodiment C of the present invention. As a result, the following findings were obtained. That is, the packaging material for a battery is produced as a laminated film by laminating the respective layers constituting the packaging material for a battery. In such a manufacturing process, when each layer of the laminated film is laminated, a foreign matter adhering to the apparatus or the like and a foreign matter scattered in the air fall on the layer by a lamination process and are laminated with the adjacent layer as it is, Foreign matter may be contained in the interface portion of the layer included in the film. Further, a foreign substance may be adhered to the resin film or the metal foil provided in the lamination at the time of feeding, or may be laminated as it is. Such a foreign matter is, for example, a dust or a metal piece, and if a packaging material for a battery in which such foreign matter is present in the layer interface portion of the laminated film is molded, due to a difference in elongation between the portion where the foreign matter exists and the other portion , It is clear that pinholes are likely to occur in the portion where the foreign object exists. As a result of further investigation by the inventors of the present invention, 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. It is difficult to be a cause.

The inventor of the present invention has found that a winding material for a packaging material for a battery comprising a laminated film in which at least a base layer, an adhesive layer, a metal layer and a sealant layer are laminated in this order, wherein at least two layers Foreign matter having an area of 0.4 mm 2 or more when viewed from the lamination direction of the laminated film is present, and in the case of the following (1C) or (2C), defects causing pinholes are appropriately managed I could find out. The third embodiment C of the present invention is an invention completed by further examination based on these findings.

(1C) The number of foreign matter having an area of 0.4 mm 2 or more is 1 or less per 100 m of the length of the laminated film having a width of 80 to 600 mm.

(2C) A mark is provided on the laminated film so that the position of the foreign object having an area of 0.4 mm 2 or more can be recognized.

That is, the first form A, the second form B and the third form C of the present invention provide the invention in the form shown below.

(First Mode A)

Item 1A. A wrapping material for a battery packaging material comprising at least a laminated film in which a coating layer, a base layer, a metal layer, and a sealant layer are laminated in this order,

The coating layer is formed of a two-liquid curable resin,

The sealant layer is formed by melt-extruded thermoplastic resin,

Wherein the sealant layer comprises a foreign matter or an unmelted material of the thermoplastic resin,

The convex portion resulting from the foreign matter or the unmelted material on the surface of the sealant layer is formed so that the position of the convex portion having an area of more than 0.4 mm 2 when viewed from the lamination direction of the laminated film can be recognized, A mark is given to the mark,

Wherein the winding body is wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other.

Section 2A. The wrapping material for a packaging material for a battery according to Item 1A, wherein the thickness of the coating layer is 5 占 퐉 or less.

Item 3A. The wrapping material for a battery packaging material according to Item 1A or 2A, wherein the thickness of the laminated film is 200 mu m or less.

Section 4A. The wrapping material for a packaging material for a battery according to any one of items 1A to 3A, wherein a height of the convex portion is 2 占 퐉 or more.

Section 5A. The roll of a packaging material for a battery according to any one of items 1A to 4A, wherein the roll is in the form of a roll having a length of 200 m or more and a diameter of a circular section of 150 mm or more.

Item 6A. A method for manufacturing a wrapping body of a packaging material for a battery according to any one of items 1A to 5A,

A step of forming a metal layer on one surface of the substrate layer;

Extruding a thermoplastic resin onto the metal layer to form the sealant layer;

A step of forming a coating layer by applying a two-liquid curable resin on the surface of the base layer opposite to the metal layer

To obtain a laminated film, and then,

In the laminated film, it is preferable that, as the convex portion due to the foreign matter or the unmelted substance contained in the sealant layer, the position of the convex portion having an area of more than 0.4 mm 2 when viewed from the lamination direction of the laminated film can be recognized A mark imparting step of applying a mark to the laminated film,

A winding step of winding the laminated film so that the surface of the sealant layer and the surface of the coating layer come into contact with each other to obtain a winding body

And winding the wrapping material on the wrapping material.

Section 7A. A wrapping material for a battery packaging material comprising at least a laminated film in which a coating layer, a base layer, a metal layer, and a sealant layer are laminated in this order,

The coating layer is formed of a two-liquid curable resin,

The sealant layer is formed by melt-extruded thermoplastic resin,

Wherein the sealant layer comprises a foreign matter or an unmelted material of the thermoplastic resin,

Wherein the number of convex portions having an area of more than 0.4 mm 2 as viewed from the direction of lamination of the laminated film is from 80 to 600 mm, The length of the film is less than one per 100 m,

Wherein the winding body is wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other.

Section 8A. The wrapping material for a packaging material for a battery according to Item 7A, wherein the thickness of the coating layer is 5 占 퐉 or less.

Section 9A. A wrapping material for a packaging material for a battery according to Item 7A or 8A, wherein the thickness of the laminated film is 200 mu m or less.

Section 10A. The wrapping material for a packaging material for a battery according to any one of items 7A to 9A, wherein a height of the convex portion is 2 占 퐉 or more.

Section 11A. The winding material for a packaging material for a battery according to any one of items 7A to 10A, wherein the roll is in the form of a roll having a length of 200 m or more and a diameter of a circular cross section of 150 mm or more.

Section 12A. A method for manufacturing a wrapping material for a packaging material for a battery according to any one of items 7A to 11A,

A step of forming a metal layer on one surface of the substrate layer;

Extruding a thermoplastic resin onto the metal layer to form the sealant layer;

A step of applying a two-liquid curable resin on the surface of the base layer opposite to the metal layer to form the coating layer

To obtain a laminated film, and then,

In the laminated film, as the convex portion due to the foreign matter or the unmelted substance contained in the sealant layer, a portion where the convex portion having an area of more than 0.4 mm 2 as viewed from the lamination direction of the laminated film is removed A convex portion removing step of making the number of convex portions having an area of more than 0.4 mm 2 to be not more than one per 100 m of the laminated film having a width of 80 to 600 mm,

A winding step of winding the laminated film so that the surface of the sealant layer and the surface of the coating layer come into contact with each other to obtain a winding body

And winding the wrapping material on the wrapping material.

Section 13A. The packaging material for a battery according to item 12A, further comprising a step of imparting a mark to the laminated film so as to recognize the position of the convex portion whose area of the laminated film exceeds 0.4 mm 2 in the convex portion removing step (2).

Section 14A. At least a coating layer formed of a two-liquid curable resin, a base layer, a metal layer, and a sealant layer formed of a melt-extruded thermoplastic resin and containing foreign matter or an unmelted material of the thermoplastic resin in this order The method for inspecting defects of a packaging material for a battery,

A step of photographing the surface of the sealant layer and recording the positional information of the foreign object or the convexity caused by the unmelted material having an area exceeding 0.4 mm 2 when viewed from the lamination direction of the laminated film;

A step of providing a mark to the laminated film so that the position of the convex portion whose area exceeds 0.4 mm 2 can be recognized in accordance with the positional information

And inspecting a defect in the packaging material for a battery.

(Second Mode B)

Section 1B. A wrapping material for a battery packaging material comprising at least a laminated film in which a coating layer, a base layer, a metal layer, and a sealant layer are laminated in this order,

The coating layer is formed of a two-liquid curable resin,

Wherein the laminated film has an indentation protruding from the coating layer to the sealant layer or an indentation protruding from the sealant layer to the coating layer,

A mark is provided on the laminated film so that the position of the indentation exceeding 0.2 mm 2 when viewed from the lamination direction of the laminated film can be recognized,

Wherein the winding body is 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 wrapping material for a battery packaging material according to Item 1B, wherein the thickness of the coating layer is 5 占 퐉 or less.

Item 3B. The wrapping material for a battery packaging material according to Item 1B or 2B, wherein the thickness of the laminated film is 200 mu m or less.

Item 4B. Wherein the height of the indentations protruding toward the sealant layer is not less than 2 占 퐉. 7. A wrapping material for a packaging material for a battery according to any one of items 1B to 3B.

Item 5B. The winding material for a packaging material for a battery according to any one of items 1B to 4B, wherein the rolled body is in the form of a roll having a length of 200 m or more and a diameter of a circular cross section of 150 mm or more.

Item 6B. A method for producing a wrapping body of a packaging material for a battery according to any one of Items 1B to 5B,

A step of laminating a base layer, a metal layer, and a sealant layer;

A step of forming a coating layer by applying a two-liquid curable resin on the surface of the base layer opposite to the metal layer

To obtain a laminated film, and then,

The indentations protruding from the coating layer to the sealant layer or the indentations protruding from the sealant layer to the coating layer are formed so that the position of the indentation exceeding 0.2 mm 2 when viewed from the lamination direction of the laminated film can be recognized, A mark applying step of applying a mark to the laminated film,

A winding step of winding the laminated film so that the surface of the sealant layer and the surface of the coating layer come into contact with each other to obtain a winding body

And winding the wrapping material on the wrapping material.

Section 7B. A wrapping material for a battery packaging material comprising at least a laminated film in which a coating layer, a base layer, a metal layer, and a sealant layer are laminated in this order,

The coating layer is formed of a two-liquid curable resin,

Wherein the laminated film has an indentation protruding from the coating layer to the sealant layer or an indentation protruding from the sealant layer to the coating layer,

Wherein the number of indentations having an area of more than 0.2 mm 2 when viewed from the lamination direction of the laminated film on the surface of the laminated film is not more than 1 per 100 m of the length of the laminated film having a width of 80 to 600 mm,

Wherein the winding body is wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other.

Section 8B. The wrapping material for a packaging material for a battery according to item 7B, wherein the thickness of the coating layer is 5 占 퐉 or less.

Section 9B. The wrapping material for a packaging material for a battery according to item 7B or 8B, wherein the thickness of the laminated film is 200 mu m or less.

Section 10B. The wrapping material for a battery packing material according to any one of items 7B to 9B, wherein a height of an indentation protruding toward the sealant layer is 2 占 퐉 or more.

Section 11B. The winding material for a packaging material for a battery according to any one of items 7B to 10B, wherein the roll is in the form of a roll having a length of 200 m or more and a diameter of a circular section of 150 mm or more.

Item 12B. A method for manufacturing a wrapping material for a packaging material for a battery according to any one of items 7B to 11B,

A step of laminating a base layer, a metal layer, and a sealant layer;

A step of forming a coating layer by applying a two-liquid curable resin on the surface of the base layer opposite to the metal layer

To obtain a laminated film, and then,

The indentations protruding from the coating layer to the sealant layer or the indentations protruding from the sealant layer to the coating layer to remove indentations having an area exceeding 0.2 mm 2 when viewed from the stacking direction of the laminated film, An indentation removing step of making the number of indentations having an area of more than 0.2 mm 2 to be not more than one per 100 m of the length of the laminated film having a width of 80 to 600 mm,

A winding step of winding the laminated film so that the surface of the sealant layer and the surface of the coating layer come into contact with each other to obtain a winding body

And winding the wrapping material on the wrapping material.

Item 13B. And a step of applying a mark to the laminated film so as to recognize the position of the indentation in which the area of the laminated film exceeds 0.2 mm 2 in the indentation removal step A method of manufacturing a body.

Item 14B. A defect inspection method for a packaging material for a battery comprising a laminated film in which a coating layer formed of a two-liquid curable resin, a base layer, a metal layer, and a sealant layer are stacked in this order,

An indentation protruding from the coating layer to the sealant layer or an indentation protruding from the sealant layer to the coating layer is formed as an indentation in which the surface of the sealant layer is imaged, A step of recording the position information of the recording medium,

A step of providing a mark to the laminated film so as to recognize the position of the indentation in which the area exceeds 0.2 mm 2 in accordance with the positional information

And inspecting a defect in the packaging material for a battery.

(Third Mode C)

Section 1C. A wrapping material for a battery packaging material comprising at least a laminated film in which a base layer, an adhesive layer, a metal layer, and a sealant layer are laminated in this order,

Foreign matter having an area of 0.4 mm < 2 > or more when viewed from the stacking direction of the laminated film is present in the interface portion of at least two layers included in the laminated film,

And a mark is provided on the laminated film so as to recognize the position of the foreign matter.

Section 2C. Wherein the foreign matter is present in at least an interface portion of the base layer and the adhesive layer, an interface portion of the adhesive layer and the metal layer, or an interface portion of the metal layer and the sealant layer. .

Section 3C. The wrapping material for a battery packaging material according to Item 1C or 2C, wherein the sealant layer is formed by a plurality of layers, and the foreign matter is present at an interface portion between the metal layer and the sealant layer.

Section 4C. Wherein the laminated film has a coating layer on the side opposite to the adhesive layer of the base layer,

The wrapping material for a 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 layer.

Section 5C. The winding material for a packaging material for a battery according to any one of items 1C to 4C, wherein the rolled body is in the form of a roll having a length of 200 m or more and a diameter of a circular cross section of 150 mm or more.

Section 6C. A method for manufacturing a wrapping material for a packaging material for a battery according to any one of items 1C to 5C,

A laminated film is obtained by a lamination step of laminating a base layer, an adhesive layer, a metal layer and a sealant layer,

As foreign matter contained in the interface portion of at least two layers included in the laminated film,

A mark applying step of applying a mark to the laminated film so as to recognize the position of the foreign object having an area of 0.4 mm 2 or more when viewed from the lamination direction of the laminated film;

A winding step of winding the laminated film to obtain a winding body

And winding the wrapping material on the wrapping material.

Section 7C. A wrapping material for a battery packaging material comprising at least a laminated film in which a base layer, an adhesive layer, a metal layer, and a sealant layer are laminated in this order,

Wherein the number of foreign matter having an area of at least 0.4 mm 2 as viewed from the lamination direction of the laminated film in the interface portion of at least two layers included in the laminated film is one per 100 m of the laminated film having a width of 80 to 600 mm By mass of the battery pack material.

Section 8C. 7. The wrapping material for a battery packaging material according to item 7C, wherein the foreign matter is present at least in an interface portion of the base layer and the adhesive layer, an interface portion of the adhesive layer and the metal layer, or an interface portion of the metal layer and the sealant layer. .

Section 9C. The wrapping material for a packaging material for a battery according to item 7C or 8C, wherein the sealant layer is formed of a plurality of layers, and the foreign matter is present in an interface portion between the metal layer and the sealant layer.

Section 10C. Wherein the laminated film has a coating layer on the side opposite to the adhesive layer of the base layer,

The wrapping material for a battery pack 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 layer.

Section 11C. The winding material for a packaging material for a battery according to any one of items 7C to 10C, wherein the rolled material 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.

Section 12C. A method for manufacturing a wrapping material for a packaging material for a battery according to any one of items 7C to 11C,

A laminated film is obtained by a lamination step of laminating a base layer, an adhesive layer, a metal layer and a sealant layer,

The foreign matter contained in the interface portion of at least two layers included in the laminated film is removed so that the foreign matter having an area of 0.4 mm < 2 > or more as viewed from the lamination direction of the laminated film is removed, A number of times per 100 m of the laminated film having a width of 80 to 600 mm,

A winding step of winding the laminated film to obtain a winding body

And winding the wrapping material on the wrapping material.

Section 13C. The method for producing a battery pack according to item 12C, further comprising a mark applying step of applying a mark to the laminated film so as to recognize the position of the foreign matter having the area of 0.4 mm 2 or more in the laminated film in the foreign substance removing step A method of manufacturing a body.

Section 14C. A defect inspection method for a packaging material for a battery comprising a laminated film in which a base layer, an adhesive layer, a metal layer, and a sealant layer are laminated in this order,

A step of photographing the surface of the laminated film and recording the positional information of the foreign object which exists in the interface portion of at least two layers included in the laminated film and has an area of 0.4 mm 2 or more when viewed from the lamination direction of the laminated film; ,

A mark giving step of giving a mark to the laminated film so that the position of the foreign object having the area of 0.4 mm 2 or more can be recognized in accordance with the positional information

And inspecting a defect in the packaging material for a battery.

According to the first aspect A and the second aspect B of the present invention, it is possible to provide a wrapping material for a packaging material for a battery in which defects of a coating layer are appropriately managed. Therefore, it is possible to appropriately suppress the production of a defective battery in the coating layer by cutting out the packaging material for a battery from the winding material of the packaging material for a battery of the first and second forms A and B and sealing the battery element, The yield of production can be improved.

According to the third aspect C of the present invention, it is possible to provide a wrapping material for a packaging material for a battery in which defects causing pinholes are appropriately managed. Therefore, it is possible to adequately suppress the production of the battery having the pinhole by cutting the battery packaging material from the wrapping material for the battery packaging material of the third aspect C and molding the packaging material for the battery to seal the battery element, The yield of production can be improved.

1 is a schematic cross-sectional view of an example of a laminated film constituting a wrapping material for a packaging material for a battery according to the first aspect A of the present invention.
2 is a schematic cross-sectional view of an example of a laminated film constituting a wrapping material for a packaging material for a battery according to the first aspect A of the present invention.
3 is a schematic cross-sectional view of an example of a laminated film constituting a wrapping body of a packaging material for a battery according to a second form B of the present invention.
4 is a schematic cross-sectional view of an example of a laminated film constituting a rolled body of a packaging material for a battery according to a second form B of the present invention.
5 is a schematic cross-sectional view of an example of a laminated film constituting a rolled body of a packaging material for a battery according to a second form B of the present invention.
6 is a schematic cross-sectional view of an example of a laminated film constituting a wrapping body of a packaging material for a battery according to a second form B of the present invention.
7 is a schematic cross-sectional view of an example of a laminated film constituting a wrapping material for a packaging material for a battery according to a third form C of the present invention.
8 is a schematic cross-sectional view of an example of a laminated film constituting a wrapping material for a packaging material for a battery according to a third form C of the present invention.

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

(First Mode A)

1A. The packing material for a first battery Winding body (1A)

The wrapping material 1A of the packaging material for a first battery according to the first aspect A of the present invention (hereinafter sometimes simply referred to as " first winding part 1A ") comprises at least a coating layer, A metal layer, and a sealant layer laminated in this order, wherein the coating layer is formed of a two-liquid curable resin, the sealant layer is formed of a melt-extruded thermoplastic resin, Wherein the sealant layer comprises a foreign matter or an unmelted material of the thermoplastic resin and the convex portion originating from a foreign substance or an unmelted material on the surface of the sealant layer is a convex portion having an area when viewed from the lamination direction of the laminated film exceeds 0.4 mm & Wherein the number of negative portions is within 1 in a length of 100 m of the laminated film having a width of 80 to 600 mm and the surface of the sealant layer and the surface of the coating layer are in contact with each other. Hereinafter, the winding body 1A of the first battery packaging material of the first mode A will be described in detail with reference to Fig. 1. Fig.

1-1A. 1st The winding body 1A is wound around  The laminated structure of the packaging material for a battery

The packaging material for a battery constituting the first winding body 1A is formed of at least a coating layer 6, a base layer 1, a metal layer 3 and a sealant layer 4, as shown in Fig. 1, for example. Are laminated in this order. The first winding body 1A is formed by winding the battery packing 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 as described later.

In the packaging material for a battery, the coating layer 6 is the outermost layer and the sealant layer 4 is the innermost layer. That is, at the time of assembling the battery, the battery element is wrapped with the packing material for the battery so that the sealant layer 4 of the battery packing material is located inside the battery, and the sealant layers 4 located at the periphery of the battery element are heat- Thus, the battery element is sealed by sealing the battery element.

The packaging material for a battery may have at least the coating layer 6, the base layer 1, the metal layer 3, and the sealant layer 4, or may have another layer. For example, as described later, in the packaging material for a battery, an adhesive layer 2 may be provided between the base layer 1 and the metal layer 3, if necessary, for the purpose of enhancing the adhesiveness. An adhesive layer 5 may be provided between the metal layer 3 and the sealant layer 4 as needed for the purpose of enhancing the adhesiveness.

1-2A. 1st Winding body  The constitution of each layer of the packaging material for a battery constituting A

[Base layer (1)]

In the packaging material for a battery, the base layer 1 is a layer which is disposed between a coating layer 6 and a metal layer 3 to be described later and which becomes a base material of a packaging material for a battery when a battery is assembled. The material for forming the base layer 1 is not particularly limited as long as it has insulation property. As a material for forming the base layer 1, for example, a material such as a polyester, a polyamide, an epoxy, an acrylic, a fluororesin, a polyurethane, a silicon resin, a phenol, a polyetherimide, a polyimide, .

Specific examples of the polyester include copolyester mainly composed of repeating units such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, polycarbonate, ethylene terephthalate, And copolyester mainly comprising repeating units of butylene terephthalate. Specific examples of the copolyester mainly comprising ethylene terephthalate as a repeating unit include copolymer polyesters (hereinafter, referred to as " polyethylene terephthalate / iso ") copolymerized with ethylene isophthalate using ethylene terephthalate as a main repeating unit Phthalate), polyethylene (terephthalate / isophthalate), polyethylene (terephthalate / adipate), polyethylene (terephthalate / sodium sulfoisophthalate), polyethylene (terephthalate / sodium isophthalate), polyethylene Phthalate / phenyl-dicarboxylate), polyethylene (terephthalate / decanedicarboxylate), and the like. Specific examples of the copolyester mainly comprising butylene terephthalate as a repeating unit include copolymer polyesters (hereinafter, referred to as polybutylene terephthalate) which is polymerized with butylene isophthalate mainly using butylene terephthalate as a repeating unit (Terephthalate / isophthalate), polybutylene (terephthalate / adipate), polybutylene (terephthalate / sebacate), polybutylene (terephthalate / decanedicarboxylate) And rhenaphthalate. These polyesters may be used singly or in combination of two or more kinds. The polyester is advantageous in that it has excellent electrolytic solution resistance and is less prone to whitening or the like in adhesion of the electrolytic solution, and is suitably used as a material for forming the base layer (1).

Specific examples of the polyamide include aliphatic polyamides such as nylon 6, nylon 66, nylon 610, nylon 12, nylon 46, copolymers of nylon 6 and nylon 6,6; Isophthalic acid-terephthalic acid copolymerized polyamide such as nylon 6I, nylon 6T, nylon 6IT, nylon 6I6T (I represents isophthalic acid and T represents terephthalic acid) including constituent units derived from terephthalic acid and / or isophthalic acid , Polymethoxy silylene adipamide (MXD6), and the like; Alicyclic polyamides such as polyaminomethylcyclohexyladipamide (PACM6); Polyamides obtained by copolymerizing a lactam component or an isocyanate component such as 4,4'-diphenylmethane-diisocyanate, polyester amide copolymers and polyether esters which are copolymers of a copolymerized polyamide and a polyester or a polyalkylene ether glycol Amide copolymers; And copolymers thereof. These polyamides may be used singly or in combination of two or more kinds. The stretched polyamide film is excellent in stretchability and can prevent whitening due to resin cracking of the base layer 1 during molding and is suitably used as a material for forming the base layer 1. [

The base layer 1 may be formed of a uniaxially or biaxially stretched resin film, or may be formed of an unoriented resin film. Among them, a uniaxially or biaxially stretched resin film, particularly a biaxially stretched resin film, is suitably used as the base layer 1 because the heat resistance is improved by orientation crystallization.

Of these, nylon, polyester, more preferably biaxially oriented nylon, biaxially oriented polyester, and particularly preferably biaxially oriented nylon are preferably used as the resin film for forming the base layer (1) .

The base layer 1 can be laminated with resin films of different materials in order to improve the pinhole resistance and the insulation when the battery is packaged. Specifically, there may be mentioned a multilayer structure in which a polyester film and a nylon film are laminated, and a multilayer structure in which a biaxially oriented polyester and a biaxially oriented nylon are laminated. When the base layer 1 has a multilayer structure, the respective resin films may be bonded together with an adhesive, or may be laminated directly without an adhesive. In the case of bonding without interposing an adhesive, for example, a method of adhering in a hot melt state such as a co-extrusion method, a sand blasting method, a thermal lamination method and the like can be mentioned. When bonding is carried out via an adhesive, the adhesive to be used may be a two-liquid curing type adhesive or a one-liquid curing type adhesive. The bonding mechanism of the adhesive is not particularly limited and may be any of chemical reaction type, solvent volatilization type, thermal fusion type, thermal pressure type, electron beam hardening type such as UV and EB. As the component of the adhesive, a resin such as a polyester resin, a polyether resin, a polyurethane resin, an epoxy resin, a phenol resin resin, a polyamide resin, a polyolefin resin, a polyvinyl acetate resin, a cellulose resin, , A polyimide resin, an amino resin, a rubber, and a silicone resin.

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

[Coating layer (6)]

In the packaging material for a battery, the coating layer 6 is a layer located on the outermost layer when the battery is assembled. In the present invention, the coating layer 6 is a layer formed by a two-liquid curable resin mainly for the purpose of imparting electrolyte resistance to a packaging material for a battery. The two-liquid curing type resin forming the coating layer 6 is not particularly limited as long as it has an electrolyte resistance, and examples thereof include a two-liquid curing type urethane resin, a two-liquid curing type polyester resin, have. The coating layer 6 may be mixed with 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 for example, a method of applying the two-liquid curable resin forming the coating layer 6 on one surface of the base layer 1 can be mentioned. When a matting agent is to be blended, a matting agent may be added to the two-liquid curable resin and mixed, followed by coating.

The coating layer 6 is preferably formed to be thin enough to exhibit electrolyte resistance. The thickness of the coating layer 6 is preferably 5 占 퐉 or less, and more preferably 3 占 퐉 or less. From the viewpoint of electrolyte resistance, the lower limit of the thickness of the coating layer 6 is usually about 2 占 퐉.

[Adhesive Layer (2)]

In the packaging material for a battery, the adhesive layer 2 is a layer which is provided if necessary for the purpose of increasing the bonding strength between the base layer 1 and the metal layer 3.

The adhesive layer 2 is formed by an adhesive capable of bonding the base layer 1 and the metal layer 3 to each other. The adhesive used for forming the adhesive layer 2 may be a two-liquid curing type adhesive or a one-liquid curing type adhesive. The bonding 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 thermal fusion type, and a thermal compression type.

Specific examples of the resin component of the adhesive that can be used for forming the adhesive layer 2 include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, polycarbonate, Polyester series resins such as esters; Polyether-based adhesives; Polyurethane-based adhesives; Epoxy resin; Phenolic resin-based resin; Nylon 6, nylon 66, nylon 12, and copolymerized polyamide; Polyolefin resins such as polyolefin, acid-modified polyolefin, and metal-modified polyolefin; Polyvinyl acetate resin; Cellulosic adhesives; (Meth) acrylic resins; Polyimide resin; Amino resins such as urea resin and melamine resin; Chloroprene rubber, nitrile rubber, and styrene-butadiene rubber; Silicone resin; Fluorinated ethylene-propylene copolymer, and the like. These adhesive components may be used alone or in combination of two or more. The combination 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, An ester, a mixed resin of a polyester and an acid-modified polyolefin, and a mixed resin of a polyester and a metal-modified polyolefin. Among these, excellent durability under low-temperature and high-humidity conditions, anti-flammability and thermal deterioration inhibiting action at the time of heat sealing, and suppression of lowering of the lamination strength between the base layer 1 and the metal layer 3, A polyurethane based two-liquid curing type adhesive; Polyamide, polyester, or a blend resin of these and a modified polyolefin.

Further, the adhesive layer 2 may be multilayered with different adhesive components. In order to improve the lamination strength of the base layer 1 and the metal layer 3, the adhesive component disposed on the base layer 1 side may be divided into the base layer 1 and the base layer 2, And it is preferable to select an adhesive component having an excellent adhesive property to the metal layer 3 as an adhesive component disposed on the metal layer 3 side. Specifically, when the adhesive layer 2 is multilayered with different adhesive components, concretely, the adhesive component disposed on the metal layer 3 side is preferably an acid-modified polyolefin, a metal-modified polyolefin, a mixed resin of a polyester and an acid-modified polyolefin , A resin containing a copolymerized polyester, and the like.

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

[Metal layer (3)]

In the packaging material for a battery, the metal layer 3 is a layer functioning as a barrier layer for preventing intrusion of water vapor, oxygen, light and the like into the inside of the battery in addition to the strength improvement of the packaging material for a battery. Specific examples of the metal constituting the metal layer 3 include aluminum, stainless steel, titanium and the like, preferably aluminum. The metal layer 3 can be formed by a metal foil or a metal deposition or the like, and is preferably formed of a metal foil, more preferably formed of an aluminum foil. From the viewpoint of preventing wrinkles and pinholes from being generated in the metal layer 3 at the time of manufacturing the packaging material for a battery, it is preferable to use a soft aluminum foil such as annealed aluminum (JIS A8021P-O, JIS A8079P-O) Is more preferable.

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

The metal layer 3 is preferably chemically treated on at least one surface, preferably both surfaces, in order to stabilize adhesion, prevent dissolution and corrosion, and the like. Here, chemical conversion treatment means treatment for forming an acid-resistant coating on the surface of the metal layer. Examples of the chemical treatment include chromic acid chromate treatment using a chromic acid compound such as chromium nitrate, chromium fluoride, chromium sulfate, chromium acetate, chromium oxalate, chromium oxide, acetylacetate chromate, chromium chloride and potassium sulfate chromium; Phosphoric acid chromate treatment using a phosphate compound such as sodium phosphate, potassium phosphate, ammonium phosphate or polyphosphoric acid; And a chromate treatment using an aminated phenol polymer having repeating units represented by the following general formulas (1) to (4).

In 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. Examples of the alkyl group represented by X, R ¹ and R ² in the formulas (1) to (4) include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, a n-butyl group, an isobutyl group, And a straight chain or branched chain alkyl group having 1 to 4 carbon atoms. 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- A straight chain or branch having 1 to 4 carbon atoms in which a hydroxy group such as a 3-hydroxypropyl group, a 1-hydroxybutyl group, a 2-hydroxybutyl group, a 3-hydroxybutyl group, And a straight chain alkyl group. In the general formulas (1) to (4), the alkyl group and the hydroxyalkyl group represented by X, R ¹ and R ² may be the same or different. In formulas (1) to (4), X is preferably a hydrogen atom, a hydroxyl group or a hydroxyalkyl group. The number average molecular weight of the aminated phenol polymer having repeating units represented by the formulas (1) to (4) is preferably, for example, from 500 to 1,000,000, more preferably from 1,000 to 20,000.

As a chemical treatment method for imparting corrosion resistance to the metal layer 3, metal oxide such as aluminum oxide, titanium oxide, cerium oxide, tin oxide or the like and fine particles of barium sulfate are dispersed in phosphoric acid, And baking treatment to form a corrosion-resistant layer on the surface of the metal layer 3. Further, on the corrosion-resistant layer, a resin layer in which the cationic polymer is crosslinked with a crosslinking agent may be further formed. Examples of the cationic polymer include ionic polymer complexes composed of polyethyleneimine, a polymer having a polyethyleneimine and a carboxylic acid, primary amine-grafted acrylic resins obtained by graft-polymerizing a primary amine on an acrylic main skeleton, polyarylamine or A derivative thereof, an aminophenol, and the like. As the cationic polymer, only one kind may be used, or two or more kinds may be used in combination. Examples of the crosslinking agent include compounds 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. These crosslinking agents may be used alone or in combination of two or more.

In the chemical conversion treatment, only one chemical conversion treatment may be performed, or two or more chemical conversion treatments may be combined. These chemical conversion treatments may be carried out by using one kind of compound alone or in combination of two or more kinds of compounds. Among chromic acid treatments, chromate chromate treatment, chromate treatment in which a chromic acid compound, a phosphoric acid compound and an aminated phenolic polymer are combined is preferable.

The amount of the acid-resistant coating 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 carrying out the chromate treatment described above, From about 0.5 mg to about 50 mg, preferably from about 1.0 mg to about 40 mg in terms of Cr, from about 0.5 mg to about 50 mg, preferably from about 1.0 mg to about 40 mg, in terms of phosphorus of the phosphorus compound, It is preferred that the phenol polymer is contained in a proportion of about 1 mg to about 200 mg, preferably about 5.0 mg to 150 mg.

The chemical treatment may be carried out by applying a solution containing a compound used for forming an acid resistant coating to the surface of the metal layer by a bar coating method, a roll coating method, a gravure coating method, a dipping method or the like, Lt; RTI ID = 0.0 > 200 C. < / RTI > The metal layer may be previously subjected to a degreasing treatment such as an alkali dipping method, an electrolytic washing method, an acid washing method, a electrolytic acid washing method, or the like before a chemical treatment is applied to the metal layer. By performing the degreasing treatment in this manner, the surface of the metal layer can be chemically treated more efficiently.

[Adhesive Layer (5)]

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-liquid curing type adhesive or a one-liquid curing type adhesive. The adhesive mechanism of the adhesive component used for forming the adhesive layer 5 is not particularly limited, and examples thereof include a chemical reaction type, a solvent volatilization type, a heat fusion type, and a thermal compression type.

Specific examples of the adhesive component that can be used for forming the adhesive layer 5 include polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, polycarbonate, Ester type resin; Polyether-based adhesives; Polyurethane-based adhesives; Epoxy resin; Phenolic resin-based resin; Nylon 6, nylon 66, nylon 12, and copolymerized polyamide; Polyolefin resins such as polyolefin, carboxylic acid modified polyolefin and metal modified polyolefin; polyvinyl acetate resins; Cellulosic adhesives; (Meth) acrylic resins; Polyimide resin; Amino resins such as urea resin and melamine resin; Chloroprene rubber, nitrile rubber, and styrene-butadiene rubber; Silicone-based resins, and the like. These adhesive components may be used alone or in combination of two or more.

Thickness of the adhesive layer 5 is not particularly limited, but is preferably about 1 占 퐉 to 40 占 퐉, for example, and more preferably about 2 占 퐉 to 30 占 퐉.

[Sealant layer (4)]

In the packaging material for a battery, the sealant layer 4 is a layer constituting the innermost layer of the packaging material for a battery when assembling the battery. The surfaces of the sealant layer 4 are brought into contact with each other at the time of assembling the battery, and the battery element can be sealed by thermally welding the contacted portion.

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

Specific examples of the polyolefin include polyethylene such as low density polyethylene, medium density polyethylene, high density polyethylene and linear low density polyethylene; Crystalline or amorphous, such as homopolypropylene, block copolymers of polypropylene (for example, block copolymers of propylene and ethylene), random copolymers of polypropylene (e.g., random copolymers of propylene and ethylene) Polypropylene; And terpolymers of ethylene-butene-propylene. Of these polyolefins, polyethylene and polypropylene are preferred.

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

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

The carboxylic acid-modified cyclic polyolefin is obtained by copolymerizing a part of the monomers constituting the cyclic polyolefin in place of the?,? - unsaturated carboxylic acid or its acid anhydride or by copolymerizing an?,? - unsaturated carboxylic acid or Is a polymer obtained by block polymerization or graft polymerization of an acid anhydride. The cyclic polyolefin to be subjected to the carboxylic acid modification may be the same as the cyclic polyolefin described above. The carboxylic acid used for the modification may be the same as that used for the modification of the above-mentioned acid-modified cycloolefin copolymer.

Of these thermoplastic resins, preferred are crystalline or amorphous polyolefins, cyclic polyolefins and blend polymers thereof; More preferred are polyethylene, polypropylene, copolymers of ethylene and norbornene, and blend polymers of two or more thereof.

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

As described later, when the sealant layer 4 is formed by melt-extruded thermoplastic resin, an unmelted or foreign matter of the thermoplastic resin may be contained in the process of forming the sealant layer 4. When the unmelted material or foreign matter is contained in the melt-extruded thermoplastic resin in the molten state, when the thermoplastic resin is cured to form the sealant layer 4, A convex portion may be formed on the surface. Among these convex portions, the number of convex portions having an area of 0.4 mm < 2 > when viewed from the stacking direction of the laminated film is generally more than one per 100 m of the laminated film having a width of 80 to 600 mm. On the other hand, in the first winding structure 1A according to the first aspect A, as will be described later, the number of convex portions having an area of more than 0.4 mm 2 is not more than 1 per 100 m of the laminated film having a width of 80 to 600 mm As shown in FIG.

In the first winding body 1A, the height of the convex portion having an area of more than 0.4 mm 2 is generally 2 탆 or more and 50 탆 or less. The height of the convex portion having an area of more than 0.4 mm 2 means the height from the surface of the portion where the convex portion of the sealant layer 4 is not formed to the apex of the convex portion.

The thickness of the sealant layer 4 is not particularly limited, but may be, for example, about 2 탆 to 2000 탆, preferably about 5 탆 to 1000 탆, and more preferably 10 탆 to 500 탆. The thickness of the sealant layer 4 is the thickness of the portion where the convex portion is not formed.

1-3A. 1st The winding of the winding body 1A  Configuration

The first winding roll 1A according to the first aspect A is constituted by winding the above-mentioned cell packing material (laminated film) 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 have. In the first winding body 1A, the number of convex portions having an area of more than 0.4 mm 2 when viewed from the lamination direction of the laminated film is controlled to be not more than one per 100 m of the laminated film having a width of 80 to 600 mm . Concretely, for example, as shown in a manufacturing method of a first winding roll 1A described later, after each layer is laminated to produce a belt-like laminated film, an area of 0.4 mm < 2 > And the number of the projections is set to be not more than one per 100 m of the length of the laminated film having a width of 80 to 600 mm so that the thickness of the coating layer 6 The number of defects is managed. That is, in the first winding body 1A, since the number of such convex portions is controlled to be one or less per 100 m of the laminated film having a width of 80 to 600 mm, the coating layer 6 ) Is suppressed. Therefore, the battery packaging material cut out from the first winding body 1A is cut out, and the battery element is sealed, whereby the production of a defective battery in the coating layer 6 can be suppressed suitably, Can be improved. As will be described later, in the first winding body 1A, the portion where the convex portion having an area of more than 0.4 mm 2 is removed may be removed by cutting only the portion or its periphery, and the portion where the convex portion is located may be removed The laminated film may be cut in the width direction and the laminated film may be connected with a tape or the like.

In the first winding body 1A, the length of the laminated film constituting the packaging material for a battery is not particularly limited, but may be 200 m or more, and preferably about 200 to 600 m, for example. 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 占 퐉 or less, preferably about 50 to 200 占 퐉, and more preferably about 65 to 130 占 퐉. The diameter of the circular section in the direction perpendicular to the width direction of the laminated film in the roll-shaped first takeup body 1A is preferably 150 mm or more, more preferably 220 mm or more. The upper limit of the diameter of the circular cross section is usually about 350 mm.

1-4A. 1st The winding of the winding body 1A  Manufacturing method

The method for manufacturing the first winding body 1A according to the first aspect A is a method for manufacturing the first winding body 1A by stacking the respective layers having a predetermined configuration and winding the laminated film on which the number, Is not particularly limited, the following method can be exemplified, for example.

First, at least a coating film 6, a base layer 1, a metal layer 3, and a sealant layer 4 are laminated in this order to obtain a laminated film. Concretely, for example, a laminated film is obtained as follows. First, the substrate layer 1 and the metal layer 3 are laminated. This lamination can be performed, for example, by a dry lamination method using the above-mentioned adhesive component for forming the adhesive layer 2 or the like. Examples of the method of laminating the base layer 1 and the metal layer 3 include a method of extruding the resin forming the base layer 1 onto the surface of the metal layer 3 and a method of forming the base layer 1 on one side And a method of forming a metal layer 3 by depositing a metal on the surface. Then, the sealant layer 4 is laminated on the metal layer 3. This lamination can be performed by, for example, a dry lamination method or the like. In order to increase the bonding 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 as required, dried, The sealant layer 4 may be formed. The sealant layer 4 is formed by melt extrusion of the thermoplastic resin. From the viewpoint of reducing the number of unmelted materials of the thermoplastic resin and suppressing the formation of convex portions having the area exceeding 0.4 mm 2, the temperature of the thermoplastic resin during melt extrusion is preferably 160 ° C or higher, more preferably 180 ° C Or more. Subsequently, the coating layer 6 is laminated on the surface of the substrate layer 1 opposite to the metal layer 3. The coating layer 6 can be formed, for example, by applying the above-mentioned two-liquid curable resin forming the coating layer 6 to the surface of the base layer 1. The order of the step of laminating the metal layer 3 on the surface of the base layer 1 and the step of laminating the coating layer 6 on the surface of the base layer 1 is not particularly limited. For example, after the coating layer 6 is formed on the surface of the base layer 1, the metal layer 3 may be formed on the surface of the base layer 1 opposite to the coating layer 6.

In order to improve adhesion of each layer in the obtained laminated film, 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 DEG C for 1 to 200 hours. 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 adhesiveness of each layer in the obtained laminated film. The temperature at this time is preferably not higher than the melting point of the sealant layer 4 + 5 占 폚 or higher and the melting point + 100 占 폚 or lower, and more preferably the melting point + 10 占 폚 or higher and the melting point + 80 占 폚 or lower. In the present invention, the melting point of the sealant layer means the endothermic peak temperature in the differential scanning calorimetry measurement of the resin component constituting the sealant layer. The heating in the aging treatment and the heating in the temperature not lower than the melting point of the sealant layer 4 can be carried out by, for example, a thermal roll contact method, a hot wind method, a near infrared ray method or the like.

Further, in the packaging material for a battery, each layer constituting the laminated film may be subjected to a coating treatment such as a corona discharge treatment or the like in order to improve or stabilize suitability for film forming, lamination processing, secondary product processing (pouching, embossing molding) Surface treatment, blast treatment, oxidation treatment, ozone treatment or the like may be carried out.

Next, in the first mode A, in the laminated film, convex portions due to a foreign substance or an unmelted substance contained in the sealant layer 4, the convex portions having an area as viewed from the lamination direction of the laminated films exceeding 0.4 mm & The convex portion removing step is carried out by removing the portion where the additional portion is located so that the number of convex portions having an area exceeding 0.4 mm 2 is one or less per 100 m 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 mode A described later. That is, the step of photographing the surface of the sealant layer 4 and recording the positional information of the foreign object or the convexity caused by the unmelted material, the area of which is larger than 0.4 mm 2 when viewed from the lamination direction of the laminated film, According to the information, the size, position, and number of the convex portions can be grasped by performing a step of giving a mark to the laminated film so that the position of the convex portion can be recognized. Then, according to the obtained positional information, the convex portions are removed so that the number of convex portions having an area of more than 0.4 mm 2 on the surface of the sealant layer is not more than one per 100 m of the laminated film having a width of 80 to 600 mm. The portion where the convex portion with the area of the laminated film exceeding 0.4 mm 2 is cut off and removed, or the portion where the convex portion is located is cut, the laminated film is cut in the width direction, Tape or the like.

Next, a winding step 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 winding body A. The method of winding the laminated film is not particularly limited as long as the laminated film in the form of a band is wound in a roll form, and may be wound on a roll or the like by using a known film winding machine or the like.

2A. Of the packaging material for the second battery Winding body (2A)

The wrapping material 2A of the wrapping material for a second battery of the first mode A (hereinafter sometimes simply referred to as " the second wrapping material 2A ") may be at least a coating layer, a base layer, And a sealant layer are laminated in this order, wherein the coating layer is formed by a two-liquid curable resin, the sealant layer is formed by melt-extruded thermoplastic resin, and the sealant layer A convex portion having an area as viewed from the lamination direction of the laminated film exceeding 0.4 mm < 2 > as a convex portion originating from the foreign matter or the unmelted portion on the surface of the sealant layer, A mark is provided on the laminated film so that the position of the part can be recognized and the surface of the sealant layer and the surface of the coating layer come into contact with each other. Hereinafter, the winding body 2A of the packaging material for a second battery of the first mode A will be described in detail.

2-1A. Second The winding body 2A  The laminated structure of the packaging material for a battery

The battery packaging material constituting the second winding body 2A of the first mode A has a lamination structure similar to that of the battery packing material constituting the first winding body 1A described above. That is, for example, as shown in Fig. 1, at least a laminated film in which a coating layer 6, a base layer 1, a metal layer 3 and a sealant layer 4 are laminated in this order is formed.

2-2A. Second The winding body 2A  The composition of each layer of the packaging material for a battery

The coating layer 6, the base layer 1, the adhesive layer 2, the metal layer 3, and, if necessary, the adhesive layer 2, the metal layer 3, The constitution of the adhesive layer 5 and the sealant layer 4 to be installed is similar to that of each layer of the packaging material for a battery constituting the first winding body 1A described above. However, the sealant layer 4 is different in the following respects.

In the sealant layer 4 in the first winding body 1A described above, the number of convex portions having an area of 0.4 mm < 2 > when the laminated film is viewed from the lamination direction, the length of the laminated film having a width of 80 to 600 mm And it is managed so as to be less than 1 per one. 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 controlled, but the number of marks The position of the convex portion is managed. Therefore, in the sealant layer 4 in the second winding body 2A, the number of convex portions having an area of 0.4 mm < 2 > when viewed from the stacking direction is usually 80 to 600 mm And more than one per 100 m of length.

2-3A. Second The winding of the winding body 2A  Configuration

The second winding body 2A of the first mode A is constituted by winding the above-mentioned battery packaging material (laminated film) 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 second winding body 2A, a mark is provided to the laminated film so that the position of the convex portion having an area of 0.4 mm < 2 > when viewed from the lamination direction of the laminated film can be recognized, whereby the position of the convex portion is managed have. Concretely, as shown in the manufacturing method of the second winding roll 2A described later, after each layer is laminated to produce a belt-like laminated film, the area of the laminated film is more than 0.4 mm < 2 & The position of the convex portion is managed by giving a mark to the laminated film so that the position of the convex portion can be recognized. That is, since the position of the convex portion in the laminated film can be recognized in the second winding body 2A, the position of the defect in the coating layer 6 in the vicinity of the convex portion can be easily recognized can do. Therefore, when the battery packaging material cut out from the second winding body 2A is cut out and used for sealing the battery element, the battery can be manufactured by avoiding the defective portion in the coating layer 6, Can be improved. In the second winding body 2A, a mark given to recognize the position of the convex portion may be provided on the convex portion, or may be provided in the vicinity of the convex portion. Such a mark can be given by using, for example, ink.

In the second winding body 2A, the length of the laminated film constituting the packaging material for a battery is not particularly limited, but may be 200 m or more, and preferably about 200 to 600 m, for example. 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 占 퐉 or less, preferably about 50 to 200 占 퐉, and more preferably about 65 to 130 占 퐉. In the roll-shaped second winding body 2A, the diameter of the circular 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. The upper limit of the diameter of the circular cross section is usually about 350 mm.

2-4A. Second The winding of the winding body 2A  Manufacturing method

The method of manufacturing the second winding body 2A of the first mode A is the same as the method of manufacturing the first winding body 1A described above up to the step of obtaining the laminated film.

Next, in the laminated film, it is possible to recognize the position of the convex portion having an area of 0.4 mm < 2 > when viewed from the lamination direction of the laminated film as the convex portion due to foreign matter or unmelted matter contained in the sealant layer A mark giving step of giving a mark to the laminated film is performed. 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 photographing the surface of the sealant layer 4 and recording the positional information of the foreign object or the convexity caused by the unmelted material, the area of which is larger than 0.4 mm 2 when viewed from the lamination direction of the laminated film, According to the information, a step of giving a mark to the laminated film is performed so that the position of the convex portion can be recognized.

Next, a winding step 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 winding body 2A. The method of winding the laminated film is not particularly limited as long as the laminated film in the form of a band is wound in a roll form, and may be wound on a roll or the like by using a known film winding machine or the like.

3A. Method for inspecting defects of the packaging material for a cell A

A defect inspection method A (hereinafter, simply referred to as " defect inspection method A ") of a packaging material for a battery of the first mode A is a method for inspecting at least a coating layer formed by a two-liquid curable resin, a base layer, A method for inspecting a defect in a packaging material for a battery formed of a melt-extruded thermoplastic resin and comprising a laminated film in which a sealant layer containing a foreign substance or an unmelted material of a thermoplastic resin is laminated in this order, A step of recording the positional information of the foreign object or the convex portion due to the unmelted material having an area larger than 0.4 mm2 as viewed from the lamination direction of the film; And a step of giving a mark to the laminated film so that the mark can be recognized.

In the defect inspection method A of the first embodiment A, the constitution of the packaging material for a battery provided for the inspection is the same as the constitution of the packaging material for a battery constituting the first winding body 1A described above. However, the sealant layer 4 is different in the following respects. That is, in the sealant layer 4 in the first winding body 1A, the number of convex portions having an area of 0.4 mm < 2 > when the laminated film is viewed from the lamination direction, the length of the laminated film having a width of 80 to 600 mm The number of defective cells is controlled to be not more than 1 per cell, while the cell packing material to be subjected to defect inspection method A of the first mode A is not managed. Therefore, in the sealant layer 4 of the packaging material for a battery to be subjected to the defect inspection method A of the first mode A, the number of convex portions having an area of 0.4 mm < 2 & Exceeds one per 100 m of the length of the laminated film of 80 to 600 mm.

In the defect inspection method A of the first mode A, first, the surface of the sealant layer 4 of the battery packaging material is imaged by using a camera or the like, and the area when viewed from the lamination direction of the laminated film is 0.4 mm & The position information of the convex portion due to the foreign substance or the non-melt is recorded. At this time, it is preferable to also record information such as the size and height of the convex portion. Such a recording process of recording the positional information of the convex portion can be performed by using a known defect inspection apparatus used for defects such as fish eyes in the film. As such a defect inspection apparatus, a commercially available product can be used.

Next, a mark giving step for giving a mark to the laminated film is carried out so as to recognize the position of the convex portion whose area exceeds 0.4 mm 2 in accordance with the positional information and the like obtained in the recording step. The position of the mark is not particularly limited as long as it is provided so as to be able to recognize the position of the convex portion. For example, the mark may be provided on the convex portion, or may be provided in the vicinity of the convex portion. Such a mark imparting step can also be performed by using a known defect inspecting apparatus as described above. The kind of the mark is not particularly limited as long as the position can be recognized. For example, a mark used in a general film defect inspection apparatus such as ink can also be used in the present invention.

As described above, it is possible to manage the position, size, number, and the like of the protrusions on the surface of the sealant layer 4 which are deficient in the coating layer 6, by the defect inspection method A of the first mode A. That is, for example, by applying the defect inspection method A of the first aspect A to the packaging material for a battery, it is possible to manage such position of the convex part in the laminated film as in the case of the second winding part 2A And it is possible to easily recognize the defect position of the coating layer 6 generated in the vicinity of the convex portion. Therefore, when the battery packaging material cut out from the second winding body 2A is cut out and used for sealing the battery element, the battery can be manufactured by avoiding the defective portion in the coating layer 6, Can be improved.

By applying the defect inspection method A of the first aspect A, the convex part of the sealant layer 4, which can be recognized by such a mark as the first rolled body 1A of the first aspect A, To 600 mm in length per 100 m of the laminated film. Therefore, the battery packaging material cut out from the first winding body 1A is cut out, and the battery element is sealed, whereby the production of a defective battery in the coating layer 6 can be suppressed suitably, Can be improved.

4A. Of cell packing material Torsional  Usage

The wrapping material A of the packaging material for a battery of the first mode A is used as a package for sealing and accommodating a battery element such as a positive electrode, a negative electrode and an electrolyte by winding a battery packaging material and cutting it to an appropriate size. That is, the battery packaging material wound from the winding body A is deformed in conformity with the shape of the battery element, and can be a package body for housing the battery element.

Specifically, at least a battery element having a positive electrode, a negative electrode, and an electrolyte is bonded to the periphery of the battery element in such a manner that the metal terminal connected to each of the positive electrode and the negative electrode protrudes outward, Area) can be formed, and is covered with a packaging material for a battery. Next, the sealant layers of the flange portion are heat-sealed and sealed to provide a battery sealed with a packaging material for a battery (package). When the battery element is accommodated using the package, the sealant layer 4 of the packaging material for a battery is used so as to be inward (the surface in contact with the battery element).

The battery packaging material wound from the winding body A of the first aspect A can be used for either the primary battery or the secondary battery, but it is particularly suitable for use in the secondary battery. The secondary battery to which the battery packing material is applied is not particularly limited and may be, for example, a lithium ion battery, a lithium ion polymer battery, a lead acid battery, a nickel hydrogen storage battery, a nickel cadmium storage battery, a nickel / iron storage battery, A capacitor, a silver oxide battery, a metal air cell, a polyvalent cation battery, a condenser, and a capacitor. Of these secondary batteries, a lithium ion battery and a lithium ion polymer battery are suitable examples of a suitable application of a packaging material for a battery wound from a winding body A of the first aspect A.

(Second Mode B)

1B. The packing material for a first battery Winding body (1B)

The wrapping material 1B of the packaging material for a first battery according to the second mode B of the present invention (hereinafter sometimes simply referred to as " first winding material 1B ") may comprise at least a coating layer, A metal layer, and a sealant layer are stacked in this order, wherein the coating layer is formed of a two-liquid curable resin, and the laminated film has an indentation protruding from the coating layer to the sealant layer (See FIG. 3 or FIG. 4, for example) or indentations projected from the sealant layer to the coating layer (for example, see FIG. 5 or FIG. 6) and the area when viewed from the stacking direction of the laminated film is 0.2 A mark is provided on the laminated film so that the position of the indentation exceeding mm 2 can be recognized. The wound body (1B) is wound so that the surface of the sealant layer and the surface of the coating layer come into contact with each other. Hereinafter, the winding body 1B of the first battery packing material of the second mode B will be described in detail with reference to Figs. 3 to 6. Fig.

1-1B. 1st The winding body 1B  The laminated structure of the packaging material for a battery

3 to 6, at least the coating layer 6, the base layer 1, the metal layer 3 (see Fig. 3), and the metal layer 3 ), And a sealant layer 4 are laminated in this order. The first winding 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 as described later.

In the packaging material for a battery, the coating layer 6 is the outermost layer and the sealant layer 4 is the innermost layer. That is, at the time of assembling the battery, the battery element is wrapped with the packing material for the battery so that the sealant layer 4 of the battery packing material is located inside the battery, and the sealant layers 4 located at the periphery of the battery element are heat- Thus, the battery element is sealed by sealing the battery element.

The packaging material for a battery may have at least the coating layer 6, the base layer 1, the metal layer 3, and the sealant layer 4, or may have another layer. For example, an adhesive layer 2 may be provided between the substrate layer 1 and the metal layer 3 as needed for the purpose of enhancing the adhesiveness. The adhesive layer 5 may be provided between the metal layer 3 and the sealant layer 4 as needed, for example, for the purpose of enhancing the adhesiveness, as shown in Fig. 4 or 6, for example.

1-2B. 1st The winding body 1B  The composition of each layer of the packaging material for a battery

The base layer 1, the adhesive layer 2, the metal layer 3 and the sealant layer 4 in the constitution of the respective layers of the packaging material for a battery constituting the first winding body 1B, A is the same. Generally, in the sealant layer 4, as shown in Fig. 3 or Fig. 4, in the case where convex portions due to indentations protruding from the coating layer 6 to the sealant layer 4 are present, The number of indentations 7 (projections) having an area of more than 0.2 mm 2 when viewed from the stacking direction of the laminated film exceeds one per 100 m of the length of the laminated film having a width of 80 to 600 mm. On the other hand, in the first winding roll 1B of the second mode B, as described later, the number of indentations 7 whose area exceeds 0.2 mm2 is 1 per 100 m of the laminated film having a width of 80 to 600 mm Or less.

In the first winding body 1B, the height of the indentations 7 (convex portions) having an area protruding toward the sealant layer 4 of more than 0.2 mm 2 is usually 2 탆 or more and 50 탆 or less. The height of the indentation 7 having an area of more than 0.2 mm 2 means the height from the surface of the portion where the indentation 7 of the sealant layer 4 is not formed to the vertex of the indentation 7 it means.

1-3B. 1st The winding of the winding body 1B  Configuration

The first winding body 1B is constituted by winding the above-described battery packaging material (laminated film) in the form of a roll so that the surface of the sealant layer 4 and the surface of the coating layer 6 are in contact with each other. For example, as shown in Fig. 3 or 4, when the coating layer 6 is formed of a two-liquid curable resin, the amount of the indentation projected from the coating layer 6 of the laminated film to the sealant layer 4 When the laminated film is wound so that the surface of the sealant layer 4 and the surface of the coating layer 6 are brought into contact with each other when the area exceeds 0.2 mm 2, the convex portions on the surface of the sealant layer 4 So that the thin coating layer 6 is liable to be damaged particularly. 5 or 6, when the indentation area protruding from the sealant layer 4 to the coating layer 6 exceeds 0.2 mm 2, the thickness of the coating layer 6 becomes thinner The convex portions on the surface of the coating layer 6 are pressed against the sealant layer 4 to form convex portions of the coating layer 6 so that the surface of the sealant layer 4 and the surface of the coating layer 6 are brought into contact with each other, The defects are particularly likely to occur.

On the other hand, in the first winding body 1B, the number of indentations 7 having an area of more than 0.2 mm 2 when viewed from the lamination direction of the laminated film is 1 per 100 m of the laminated film having a width of 80 to 600 mm Or less. Concretely, for example, as shown in the manufacturing method of the first winding roll 1B to be described later, after each layer is laminated to produce a belt-like laminated film, before the winding is carried out, The portion where the excess indentation 7 is located is removed from the laminated film so that the number of the indentations 7 is made to be one or less per 100 m of the length of the laminated film having a width of 80 to 600 mm, The number of defects of the coating layer 6 which is generated even when any one of convex portions of the sealant layer or the convex portion of the coating layer 6 is formed. That is, in the first winding body 1B, since the number of such indentations 7 is controlled to be one or less per 100 m of the length of the laminated film having a width of 80 to 600 mm, So that the occurrence of defects in the coating layer 6 caused by the portions is suppressed. Therefore, it is possible to appropriately suppress the production of a defective battery in the coating layer 6 by cutting out the packaging material for a battery wound from the first winding body 1B and sealing the battery element, Can be improved. As will be described later, in the first winding body 1B, the portion where the indentation 7 having an area of more than 0.2 mm 2 is located may be removed by cutting only the portion or the periphery thereof, and the indentation 7 ) May be included so that the laminated film is cut in the width direction, and the laminated film may be connected with a tape or the like.

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

1-4B. 1st The winding of the winding body 1B  Manufacturing method

The method for producing the first winding body 1B of the second mode B is a method for laminating the respective layers having a predetermined structure and winding a laminated film on which the number and size of the indentations 7 of the laminated film are controlled As long as it is obtained, there is no particular limitation, but the following method can be exemplified.

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

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

Further, in the packaging material for a battery, each layer constituting the laminated film may be subjected to a coating treatment such as a corona discharge treatment or the like in order to improve or stabilize suitability for film forming, lamination processing, secondary product processing (pouching, embossing molding) Surface treatment, blast treatment, oxidation treatment, ozone treatment or the like may be carried out.

Next, in the second mode B, in the laminated film, the portion where the indentation 7 whose area is larger than 0.2 mm 2 as seen from the lamination direction of the laminated film is removed, The indentation removing step is carried out so that the number of the indentations 7 is one or less per 100 m of the 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, the step of imaging the surface of the sealant layer 4 and recording the positional information of the indentation 7 whose area as viewed from the lamination direction of the laminated film exceeds 0.2 mm 2, The position and number of the indentations 7 can be grasped by performing a step of giving a mark to the laminated film so that the position of the indentation 7 can be recognized. Then, the indentation 7 is removed so as to be not more than one per 100 m of the length of the laminated film having a width of 80 to 600 mm according to the obtained positional information. The portion where the indentation 7 having an area of more than 0.2 mm 2 is located may be cut off and removed therefrom, or the portion where the indentation 7 is located may be cut, the laminated film may be cut in the width direction, The laminated film may be connected with a tape or the like.

Next, a winding step 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 winding body 1B. The method of winding the laminated film is not particularly limited as long as the laminated film in the form of a band is wound in a roll form, and may be wound on a roll or the like by using a known film winding machine or the like.

2B. Of the packaging material for the second battery Winding body (2B)

The wrapping body 2B of the packaging material for a second battery (hereinafter sometimes simply referred to as " second winding body 2B ") may be formed by at least a coating layer, a base layer, a metal layer, And the laminated film is a laminated film comprising indentations protruding from the coating layer to the sealant layer or indentations protruding from the sealant layer to the coating layer as the winding layer of the wrapping material for a battery comprising the laminated film A mark is provided on the laminated film so that the position of the indentation exceeding 0.2 mm 2 when viewed from the lamination direction of the laminated film can be recognized and the winding body 2B is provided with a mark on the surface of the sealant layer and on the surface of the coating layer And is wound so as to come into contact with the surface. Hereinafter, the winding body 2B of the packaging material for a second battery of the second mode B will be described in detail.

2-1B. Second The winding body 2B  The laminated structure of the packaging material for a battery

The battery packaging material constituting the second winding body 2B of the second mode B has a lamination structure similar to that of the battery packing material constituting the first winding body 1B described above. That is, for example, as shown in Fig. 3, at least a laminated film in which a coating layer 6, a base layer 1, a metal layer 3 and a sealant layer 4 are laminated in this order is formed.

2-2B. Second The winding body 2B  The composition of each layer of the packaging material for a battery

The coating layer 6, the base layer 1, the adhesive layer 2, the metal layer 3, and, if necessary, the adhesive layer 2, the metal layer 3, The constitution of the adhesive layer 5 and the sealant layer 4 to be installed is the same as the constitution of each layer of the packaging material for a battery constituting the first winding body 1B described above. However, it differs from the following points.

In the sealant layer 4 in the first winding roll 1B described above, the number of indentations 7 having an area of more than 0.2 mm 2 when viewed from the lamination direction of the laminated film is 80 to 600 mm, Is controlled to be 1 or less per 100 m in length. On the other hand, in the sealant layer 4 of the second winding body 2B, the number of the indentations 7 having such a size is not necessarily managed, but the position of the indentation 7 can be recognized , A mark is given to the laminated film so that the position of the indentation 7 is managed. Therefore, in the sealant layer 4 in the second winding body 2B, the number of indentations 7 having an area exceeding 0.2 mm 2 when viewed from the stacking direction of the laminated film is usually 80 to 600 mm It exceeds one per 100 m of laminated film length.

2-3B. Second (2B) of the take-  Configuration

The second winding body 2B is constituted by winding the above-described battery packaging material (laminated film) 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 second winding body 2B, a mark is given to the laminated film so that the position of the indentation 7 whose area as viewed from the lamination direction of the laminated film is more than 0.2 mm 2 can be recognized, ) Is managed. Concretely, as shown in the manufacturing method of the second winding roll 2B described later, after each layer is laminated to produce a belt-like laminated film, the area of the laminated film is set to 0.2 mm < 2 & The position of the indentation 7 is managed by giving a mark to the laminated film so that the position of the indentation 7 in excess can be recognized. Since the position of the indentation 7 in the laminated film can be recognized in the second winding body 2B, not only the defects in the convex portion formed in the coating layer 6 but also the defect in the sealant layer 4 The defect position of the coating layer 6 in the vicinity of the convex portion can be easily recognized. Therefore, when the cell packing material cut out from the second winding body 2B is cut out and used for sealing the battery element, the battery can be manufactured by avoiding the defective portion in the coating layer 6, Can be improved. In the second winding body 2B, a mark provided to recognize the position of the convex portion may be provided on the indentation 7, or may be provided in the vicinity of the indentation 7. Such a mark can be given by using, for example, ink.

In the second winding body 2B, the length of the laminated film constituting the packaging material for a battery is not particularly limited, but may be 200 m or more, and preferably about 200 to 600 m, for example. 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 占 퐉 or less, preferably about 50 to 200 占 퐉, and more preferably about 65 to 130 占 퐉. In the roll-shaped second winding body, the diameter of the circular 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. The upper limit of the diameter of the circular cross section is usually about 350 mm.

2-4B. Second (2B) of the take-  Manufacturing method

The method for manufacturing the second winding member 2B is the same as the method for manufacturing the first winding member 1B up to the portion for obtaining the laminated film.

Next, in the laminated film, an indentation protruding from the coating layer 6 to the sealant layer 4 or an indentation protruding from the sealant layer 4 to the coating layer 4 has an area when viewed from the lamination direction of the laminated film A mark giving step of giving a mark to the laminated film is carried out so that the position of the indentation 7 exceeding 0.2 mm2 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, the step of imaging the surface of the sealant layer 4 and recording the positional information of the indentation 7 whose area as viewed from the lamination direction of the laminated film exceeds 0.2 mm 2, A step of giving a mark to the laminated film is carried out so that the position of the laminated film 7 can be recognized.

Next, a winding step 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 winding body 2B. The method of winding the laminated film is not particularly limited as long as the laminated film in the form of a band is wound in a roll form, and may be wound on a roll or the like by using a known film winding machine or the like.

3B. Method for inspecting defects in packing materials for cells B

A defect inspection method B (hereinafter sometimes simply referred to as " defect inspection method B ") of a packaging material for a battery of the second mode B is a method for inspecting at least a coating layer formed by a two- liquid curable resin, a base layer, And a sealant layer are stacked in this order, wherein the surface of the sealant layer is imaged, and an indentation in which an area when viewed from the lamination direction of the laminated film is larger than 0.2 mm < 2 > A step of recording the positional information of the indentations projected from the sealant layer to the coating layer from the indentations or the sealant layer projected onto the sealant layer and a step of recording marks on the laminated film so that the position of the indentations exceeding 0.2 mm2 in area can be recognized, And a step of applying a voltage to the electrode.

In the defect inspection method B, the constitution of the packaging material for a battery to be provided for the inspection is the same as the constitution of the packaging material for a battery constituting the first winding body 1B described above. However, it differs from the following points. That is, in the sealant layer 4 in the first winding body 1B, the number of indentations 7 having an area of more than 0.2 mm 2 when the laminated film is viewed from the stacking direction is 80 to 600 mm in width, Is controlled to be not more than 1 per 100 m in length, but such management is not performed in the case of the packaging material for a battery to which the defect inspection method B is directed. Therefore, in the case of the packaging material for a battery to be subjected to the defect inspection method B, the number of indentations 7 having an area of more than 0.2 mm 2 when viewed from the stacking direction of the laminated film is usually 80 to 600 mm More than one per 100m length.

In the defect inspection method B, first, the surface of the sealant layer 4 of such a packaging material for a battery is imaged using a camera or the like, and an indentation with an area exceeding 0.2 mm 2 as viewed from the lamination direction of the laminated film ( 7 are recorded in the recording step. At this time, information such as the size and height of the indentation 7 is also preferably recorded. The recording step of recording the positional information of the indentation 7 can be performed by using a known defect inspection apparatus used for inspection of defects such as fish eyes in a film. As such a defect inspection apparatus, a commercially available product can be used.

Next, a mark giving step is carried out to give a mark to the laminated film so that the position of the indentation 7 whose area exceeds 0.2 mm 2 can be recognized in accordance with the positional information and the like obtained in the recording step. The position of the mark is not particularly limited as long as it is provided so as to be capable of recognizing the position of the indentation 7. For example, the position of the mark may be given on the indentation 7 or may be provided in the vicinity of the indentation 7 do. Such a mark imparting step can also be performed by using a known defect inspecting apparatus as described above. The kind of the mark is not particularly limited as long as the position can be recognized. For example, a mark used in a general film defect inspection apparatus such as ink can also be used in the present invention.

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

In addition, by applying the defect inspection method B, the indentations 7 that can be recognized by such marks, as in the case of the first winding roll 1B, can be reduced to one or less per 100 m of the laminated film having a width of 80 to 600 mm As shown in FIG. Therefore, it is possible to appropriately suppress the production of a defective battery in the coating layer 6 by cutting out the packaging material for a battery wound from the first winding body 1B and sealing the battery element, Can be improved.

4B. Of cell packing material Winding body  Usage of B

The wrapping material B of the packaging material for a battery of the second mode B is the same as the use exemplified in the first mode A.

(Third Mode C)

1C. The packing material for a first battery Winding body (1C)

The wrapping material 1C of the packaging material for a first battery of the third mode (hereinafter sometimes simply referred to as " first winding material 1C ") includes at least a base layer, an adhesive layer, And a sealant layer laminated in this order on a surface of at least two layers contained in a laminated film, wherein the laminated film has an area of 0.4 mm < 2 > Is 1 or less per 100 m of the length of the laminated film having a width of 80 to 600 mm. Hereinafter, the winding body 1C of the packaging material for a first battery will be described in detail with reference to Figs. 7 and 8. Fig.

1-1C. 1st The winding body 1C  The laminated structure of the packaging material for a battery

7, the base material layer 1, the adhesive layer 2, the metal layer 3, and the sealant layer 4 are laminated on the first winding body 1C, And a laminated film laminated in this order. In addition, as will be described later, the first winding body 1C is formed by winding the battery packing material in a roll form. The first winding body 1C may be wound so that the sealant layer 4 of the battery packaging material is inwardly wound or the base layer 1 is wound inwardly.

The packaging material for a battery may have at least the base layer 1, the adhesive layer 2, the metal layer 3 and the sealant layer 4, or may have another layer. For example, as shown in Figs. 7 and 8, the packaging material for a battery may have a coating layer 6 on the side opposite to the adhesive layer 2 of the base layer 1, if necessary. 8, an adhesive layer 5 may be provided between the metal layer 3 and the sealant layer 4 as needed for the purpose of enhancing the adhesiveness.

In the packaging material for a battery, the base layer (1) or the coating layer (6) becomes the outermost layer, and the sealant layer (4) becomes the innermost layer. That is, at the time of assembling the battery, the sealant layer 4 of the battery packaging material is located inside the battery, the battery element is wrapped with the battery packaging material, and the sealant layers 4 located at the periphery of the battery element are heat- Thus, the battery element is sealed by sealing the battery element.

1-2C. 1st The winding body 1C  The composition of each layer of the packaging material for a battery

In the third mode C, the constitution of each layer of the packaging material for a battery constituting the first winding roll 1C is the same as that of the first form A. However, in the third mode C, the coating layer 6 is a layer which is provided if necessary. The sealant layer 4 differs from the sealant layer 4 with respect to the following foreign matter 8.

[Foreign body (8)]

As described above, in the production process of the packaging material for a battery, when the respective layers of the laminated film are laminated, the foreign matter adhered to the apparatus or the like and the foreign matter scattered in the air fall on the layer in the lamination step, Layer, the foreign matter may be contained in the interface portion of the layer included in the laminated film. In addition, some of the resin films, metal foil and the like constituting each layer of the laminated film are also adhered with foreign matter. Pinholes are liable to be generated in a portion where foreign matter exists due to a difference in elongation between a portion where the foreign matter exists and a portion where the foreign matter exists in the battery packaging material in which such foreign matter exists in the layer interface portion of the laminated film . Among such foreign matter, the foreign matter 8 having an area of 0.4 mm 2 or more when viewed from the lamination direction of the laminated film tends to be a cause of pinholes in the molding process, and if it is smaller than this, it's difficult. The number of foreign matter 8 having an area of 0.4 mm 2 or more is generally one or more per 100 m of the laminated film having a width of 80 to 600 mm. On the other hand, in the first winding body 1C, as described later, the number of foreign matter 8 having an area of 0.4 mm2 or more is managed to be one or less per 100 m of the laminated film having a width of 80 to 600 mm.

In the third mode C, the foreign matter 8 having an area of 0.4 mm 2 or more exists at the interface portion of at least two layers included in the laminated film. Such foreign matter 8 has at least an interface between the base layer 1 and the adhesive layer 2 and an interface between the adhesive layer 2 and the metal layer 3 as shown in Fig. Or the interface portion of the metal layer 3 and the sealant layer 4. In the case of providing the adhesive layer 5, it may be present at the interface portion between the metal layer 3 and the adhesive layer 5, the adhesive layer 5, the interface portion between the adhesive layer 5 and the sealant layer 4, and the like. In addition, when the coating layer 6 is provided, foreign matter may be present at the interface portion between the coating layer 6 and the base layer 1. [ Further, for example, when the sealant layer 4 is formed by a plurality of layers, the foreign matter 8 may be present at the interface portion of at least two layers included in the sealant layer 4. [ In addition, in the present invention, the interface portion of each layer in which foreign matters exist includes the interface and its vicinity, and foreign matters present in the interface portion include not only foreign substances present at the interface of the layer but also foreign matters existing in the interface And it is located in the vicinity of the interface but not in the interface. Since the adhesive layer 2 and the adhesive layer 5 to be provided as required are usually very thin, foreign matter may be present in the adhesive layer 2 or the adhesive layer 5, and in the third mode C Of the adhesive layer 2 (inside of the adhesive layer 2) and in the adhesive layer 5 (inside of the adhesive layer 5) are included in the " interface portion of at least two layers "

Particularly, in the presence of the foreign matter 8 having an area of at least 0.4 mm 2 in the interface portion between the adhesive layer 2 and the metal layer 3 or in the adhesive layer 2 among these interface portions in which the foreign matter 8 can be contained, easy to do. This is considered to be due to the fact that the difference in tensile strength between the base layer 1 and the metal layer 3 is large. Specifically, since the tensile strength of the base layer 1 is generally larger than the tensile strength of the metal layer 3, the base layer 1 and the metal layer 3 are laminated to each other as compared with the case of forming the metal layer 3 alone The greater the tensile strength at the time of molding the packaging material for a battery of the present invention. The base layer 1 and the metal layer 3 in the portion where the foreign matter 8 is present 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 A large amount of force joining to the metal layer 3 is applied to the portion of the metal layer 3 in which the foreign matter 8 is present when the packing material for a battery is stretched by molding, Is likely to occur.

When the foreign matter 8 is present between the metal layer 3 and the sealant layer 4, the metal layer 3 is scratched by the foreign matter 8 at the time of molding the packaging material for a battery, It is easy to cause.

The foreign matter 8 is not particularly limited, but generally includes dust, metal pieces, an oligomer of a resin forming the substrate layer 1, and a carbide. The thickness of the foreign matter 8 having an area of 0.4 mm 2 or more is usually 2 탆 or more and 50 탆 or less. The thickness of the foreign matter 8 means the thickness of the foreign matter 8 in the lamination direction of the laminated film.

1-3C. 1st The winding of the winding body 1C  Configuration

The first winding body 1C is constituted by winding the above-mentioned battery packaging material (laminated film) in the form of a roll. The first winding body 1C may be wound such that the sealant layer 4 of the battery packaging material is inwardly wound or the base layer 1 is wound inward.

In the first winding body 1C, the number of foreign matter having an area of 0.4 mm < 2 > or more when viewed from the lamination direction of the laminated film in the interface portion of at least two layers included in the laminated film is 80 to 600 mm Is controlled to be not more than one per 100 m of the length of the laminated film. Concretely, for example, as shown in a manufacturing method of a first winding roll 1C to be described later, after each layer is laminated to produce a belt-like laminated film, before winding the laminated film, Is removed from the laminated film and the number of the foreign matter 8 is set to be not more than one per 100 m of the length of the laminated film having a width of 80 to 600 mm so that defects Is managed. That is, in the first winding body 1C, since the number of such foreign bodies 8 is controlled to be not more than one per 100 m of the length of the laminated film having a width of 80 to 600 mm, The generation of defects is suppressed. Therefore, by cutting out the packaging material for a battery wound from the first winding body 1C and sealing the battery element, the production of a battery having a pinhole can be suitably suppressed, and the yield of battery manufacturing can be improved . As 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 winding body 1C, the length of the laminated film constituting the packaging material for a battery is not particularly limited, but may be 200 m or more, and preferably about 200 to 600 m, for example. 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 占 퐉 or less, preferably about 50 to 200 占 퐉, and more preferably about 65 to 130 占 퐉. In the roll-shaped first winding body 1C, the diameter of the circular section in the direction perpendicular to the width direction of the laminated film is preferably 150 mm or more, and more preferably 220 mm or more. The upper limit of the diameter of the circular cross section is usually about 350 mm.

1-4C. 1st The winding of the winding body 1C  Manufacturing method

The method of manufacturing the first winding body 1C is not particularly limited as long as the respective layers having a predetermined structure are laminated and a laminated film in which the number, size, and the like of the foreign matter 8 is wound can be obtained, For example, the following method can be exemplified.

First, at least a base layer 1, an adhesive layer 2, a metal layer 3, and a sealant layer 4 are laminated in this order to obtain a laminated film. Concretely, for example, a laminated film is obtained as follows. First, the substrate layer 1 and the metal layer 3 are laminated. This lamination can be performed by a dry lamination method using the above-mentioned adhesive component for forming the adhesive layer 2 or the like. Then, the sealant layer 4 is laminated on the metal layer 3. This lamination can be performed by, for example, a dry lamination method or the like. In order to increase the bonding strength between the metal layer 3 and the sealant layer 4, an adhesive component for forming the adhesive layer 5 is applied onto the metal layer 3, if necessary, The sealant layer 4 may be formed. The sealant layer 4 can be formed, for example, by melt extrusion of a thermoplastic resin. The sealant layer 4 may be formed by laminating a resin film on the metal layer 3, for example. The coating layer 6 may be laminated on the surface of the substrate layer 1 opposite to the metal layer 3, if necessary. The coating layer 6 can be formed, for example, by applying the aforementioned two-liquid curable resin forming the coating layer 6 to the surface of the base 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 is not particularly limited. For example, after the coating layer 6 is formed on the surface of the base layer 1, the metal layer 3 may be formed on the surface of the base layer 1 opposite to the coating layer 6.

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

Further, in the packaging material for a battery, each layer constituting the laminated film may be subjected to a coating treatment such as a corona discharge treatment or the like in order to improve or stabilize suitability for film forming, lamination processing, secondary product processing (pouching, embossing molding) Surface treatment, blast treatment, oxidation treatment, ozone treatment or the like may be carried out.

Next, the foreign matter contained in the interfacial portion of at least two layers included in the laminated film and the portion where the foreign matter 8 having an area of 0.4 mm < 2 > or more as viewed from the lamination direction of the laminated film is located is removed, The number of foreign matters 8 having a size of 0.4 mm 2 or more is set to 1 or less 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 foreign object can be detected by, for example, a defect inspection method to be described later. In other words, the step of photographing the surface of the laminated film and recording the positional information of the foreign matter 8 having an area of 0.4 mm 2 or more when viewed from the lamination direction of the laminated film, and the step of recognizing the position of the foreign matter The size, position, and number of the foreign matter can be grasped by performing a step of giving a mark to the laminated film. Subsequently, the foreign matter 8 having an area of 0.4 mm 2 or more is removed so as to be not more than 1 per 100 m in length of the laminated film having a width of 80 to 600 mm, according to the obtained positional information. The portion where the foreign matter 8 having an area of 0.4 mm 2 or more is located may be cut and removed only at the portion or the periphery thereof and the portion where the foreign matter 8 is located is cut into the laminated film in the width direction, May be connected with a tape or the like.

Next, a winding step is performed in which the laminated film is wound to obtain the first winding body 1C. The method of winding the laminated film is not particularly limited as long as the laminated film in the form of a band is wound in a roll form, and may be wound on a roll or the like by using a known film winding machine or the like.

2C. Of the packaging material for the second battery Winding body (2C)

The wrapping material 2C of the packaging material for a second battery (hereinafter sometimes simply referred to as " second winding material 2C ") includes at least a base layer 1, an adhesive layer 2, ) And a sealant layer (4) are laminated in this order, wherein the interfacial portion of at least two layers included in the laminated film has a surface area when viewed from the lamination direction of the laminated film Is 0.4 mm < 2 > or more, and marks are provided on the laminated film so that the position of the foreign matter can be recognized. Hereinafter, the winding body 2C of the packaging material for a second battery will be described in detail.

2-1C. Second The winding body 2C  The laminated structure of the packaging material for a battery

The packaging material for a battery constituting the second winding member 2C has the same lamination structure as the packaging material for a battery constituting the first winding-up member 1C described above. That is, for example, as shown in Fig. 7, at least a laminated film in which a base layer 1, an adhesive layer 2, a metal layer 3 and a sealant layer 4 are laminated in this order is formed.

2-2C. Second The winding body 2C  The composition of each layer of the packaging material for a battery

The coating layer 6, the base layer 1, the adhesive layer 2, the metal layer 3, and, if necessary, the layers of the battery packaging material constituting the second winding body 2C, The constitution of the adhesive layer 5 and the sealant layer 4 to be installed is the same as the constitution of each layer of the packaging material for a battery constituting the first winding body 1C described above. However, the number of foreign matter 8 having an area of 0.4 mm 2 or more differs from the following points.

In the above-mentioned first winding body 1C, the number of the foreign matter 8 having an area of 0.4 mm < 2 > or more when viewed from the lamination direction is 1 or less per 100 m of the laminated film having a width of 80 to 600 mm It is managed. On the other hand, in the laminated film in the second winding body 2C, the number of foreign matter 8 having such a size is not necessarily controlled, but the number of the foreign matter 8 having such a size is not necessarily controlled, So that the position of the foreign matter 8 is managed. Further, in the second winding body 2C, it is also preferable that the number of the laminated films of 80 to 600 mm in width is controlled to be 1 or less per 100 m in length. Therefore, in the second winding body 2C, the number of foreign matter 8 having an area of 0.4 mm < 2 > or more when viewed from the stacking direction of the laminated film is usually 1 or less per 100 m of the laminated film having a width of 80 to 600 mm .

2-3. Second (2C) of the winding body  Configuration

The second winding body 2C is constituted by winding the above-mentioned battery packaging material (laminated film) in a roll shape. Similarly to the first winding body 1C, the second winding body 2C may be wound such that the sealant layer 4 of the battery packing material is inwardly wound or the base layer 1 is wound inwardly do.

In the second winding body 2C, a mark is given to the laminated film so that the position of the foreign matter 8 having an area of 0.4 mm 2 or more when viewed from the lamination direction of the laminated film can be recognized, Location is being managed. Concretely, as shown in the manufacturing method of the second winding roll 2C to be described later, after each layer is laminated to produce a belt-shaped laminated film, before the laminated film is wound, the area of the laminated film is 0.4 mm & The position of the foreign matter 8 is managed by marking the laminated film so that the position of the foreign matter 8 can be recognized. In other words, in the second winding body 2C, since the position of the foreign matter 8 in the laminated film is managed so as to be able to recognize the position of the foreign matter 8 generated by the foreign matter 8 at the time of molding , It can be easily recognized. Therefore, when the battery packaging material cut out from the second winding roll 2C is cut out and used for sealing the battery element, the battery can be manufactured while avoiding the defective portion, and the yield of the battery can be improved . In the second winding body 2C, a mark given to recognize the position of the foreign matter 8 may be provided on the foreign matter 8 or may be given in the vicinity of the foreign matter 8 . Such a mark can be given by using, for example, ink.

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

2-4C. Second (2C) of the winding body  Manufacturing method

The manufacturing method of the second winding member 2C is the same as the method of manufacturing the first winding member 1C up to the step of obtaining the laminated film.

Next, in order to recognize the position of the foreign matter 8 contained in the interface portion of at least two layers included in the laminated film and the foreign matter 8 having an area of 0.4 mm 2 or more when viewed from the stacking direction of the laminated film, A mark giving process for giving a mark is performed. The size, position and number of the foreign object 8 can be detected by, for example, a defect inspection method C described later. That is, the step of photographing the surface of the laminated film and recording the positional information of the foreign matter 8 having an area of 0.4 mm 2 or more as viewed from the lamination direction of the laminated film, A step of giving a mark to the laminated film is performed.

Next, a winding step is performed in which the laminated film is wound to obtain the second winding body 2C. The method of winding the laminated film is not particularly limited as long as the laminated film in the form of a band is wound in a roll form, and may be wound on a roll or the like by using a known film winding machine or the like.

3C. Method for inspecting defects of the packaging material for a cell C

The defect inspection method C (hereinafter simply referred to as "defect inspection method C") of the packaging material for a battery in the third embodiment C is a method of inspecting at least the base layer 1, the adhesive layer 2, ) And a sealant layer (4) are laminated in this order, characterized in that the surface of the laminated film is picked up, and at least one layer existing in the interface portion of at least two layers contained in the laminated film A step of recording the positional information of the foreign object having an area of 0.4 mm 2 or more when viewed from the lamination direction of the laminated film and a step of recording marks on the laminated film so that the position of the foreign object having an area of 0.4 mm 2 or more can be recognized, And a mark imparting step of giving a mark.

In the defect inspection method C, the configuration of the packaging material for a battery provided for the inspection is the same as the configuration of the packaging material for a battery constituting the first winding unit 1C described above. However, the number of foreign matter 8 having an area of 0.4 mm 2 or more differs from the following points. That is, in the first winding body 1C, the number of the foreign matter 8 having an area of 0.4 mm2 or more when viewed from the lamination direction of the laminated film is one or less per 100 m of the laminated film having a width of 80 to 600 mm Whereas in the case of the packaging material for a battery in which the defect inspection method C is the object, such management is not carried out. Therefore, in the battery packaging material to be subjected to the defect inspection method C, the number of foreign matter 8 having an area of 0.4 mm < 2 > or more when viewed from the stacking direction of the laminated film is 100 m Or more.

In the defect inspection method C, first, the surface of the laminated film 4 of such a packaging material for a battery is imaged by using a camera or the like, and the foreign matter 8 having an area of 0.4 mm < 2 & Is recorded on the recording medium. At this time, it is desirable to also record information on the size, height, etc. of the foreign object 8. Such a recording process of recording the positional information of the foreign object 8 can be performed by using a known defect inspection apparatus used for defect inspection of a fish eye or the like in a film. As such a defect inspection apparatus, a commercially available product can be used.

Next, a mark giving step of giving a mark to the laminated film is performed so that the position of the foreign matter 8 having an area of 0.4 mm 2 or more can be recognized in accordance with the positional information and the like obtained in the recording step. The position of the mark is not particularly limited as long as it is provided so as to be able to recognize the position of the foreign matter 8. For example, the position of the mark may be given on the foreign matter 8, do. Such a mark imparting step can also be performed by using a known defect inspecting apparatus as described above. The kind of the mark is not particularly limited as long as the position can be recognized. For example, a mark used in a general film defect inspection apparatus such as ink can also be used in the present invention.

By the defect inspection method C, it is possible to manage the position, size, number, and the like of the foreign matter 8 of the laminated film having defects causing pinholes as described above. That is, for example, by applying the defect inspection method C to the packaging material for a battery, it is possible to manage such a position of the foreign matter 8 in the laminated film as in the case of the second winding body 2C , It is possible to easily recognize the position of a defect generated by the foreign matter 8 at the time of molding. Therefore, when the battery packaging material cut out from the second winding roll 2C is cut out and used for sealing the battery element, the battery can be manufactured while avoiding defective portions which cause pinholes, The yield can be improved.

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 case of the first winding roll 1C can be detected with the length of the laminated film having a width of 80 to 600 mm It can be removed less than 1 per 100m. Therefore, by cutting out the packaging material for a battery wound from the first winding body 1C and sealing the battery element, production of a battery having a defect causing pinholes can be suitably suppressed, The yield can be improved.

4C. Of cell packing material Winding body  Uses of C

The wrapping material C of the packaging material for a battery of the third mode C is the same as the use exemplified in the first mode A.

(Example)

Hereinafter, the present invention will be described in detail by way of examples. However, the present invention is not limited to the embodiments. The embodiments are shown in the order of the first form A, the second form B, and the third form C.

First type  Of A Example

[Production of packing material for cell A]

A metal layer 3 composed of an aluminum foil (thickness: 40 m) having been chemically treated on both sides was laminated on the base layer 1 made of an elongated nylon film (thickness: 25 m) by a dry lamination method. Specifically, a two-component urethane adhesive (a polyol compound and an aromatic isocyanate compound) was applied to one side of an aluminum foil to form an adhesive layer 2 (thickness 4 탆) on the metal layer 3. Subsequently, the adhesive layer 2 on the metal layer 3 and the base layer 1 are pressurized and bonded to each other, and then subjected to aging treatment at 40 占 폚 for 24 hours to form the base layer 1 / the adhesive layer 2 / (3) was prepared. The chemical conversion treatment of the aluminum foil used as the metal layer 3 is carried out in such a manner that the treatment liquid composed of the phenol resin, the chromium fluoride compound and the phosphoric acid is coated on the aluminum foil 3 by the roll coating method so that the coating amount of chromium is 10 mg / , And baking was performed for 20 seconds under the condition that the coating temperature was 180 DEG C or higher.

Subsequently, a resin component (a mixed resin of an acid-modified polypropylene resin and a propylene resin) for forming a sealant layer 4 on the metal layer 3 side of the laminate was extruded in a molten state (250 DEG C) A sealant layer 4 (thickness: 50 mu m) was laminated. Next, a two-liquid curing type resin for forming a coating layer 6 on the base layer 1 was applied by a gravure coating method to form a coating layer 6 on the base layer 1 (thickness: 3 m). Thus, a strip-shaped packaging material A for a battery was obtained which was formed of a laminated film in which the coating layer 6 / the base layer 1 / the adhesive layer 2 / the metal layer 3 / the sealant layer 4 were laminated in this order.

[Defect Inspection of Battery Packing Material A]

With respect to the packaging material for a battery obtained above, the position information of the convex portion having an area in a range of 0.03 to 3.1 mm 2 as viewed from the lamination direction of the laminated film was recorded using a commercially available film defect inspection apparatus, A mark is provided in the vicinity of the convex portion.

[Preparation of wrapping material A for battery packaging material]

In the same manner as described above, the packing material for a cell having the width and length shown in Table 1A and having the mark attached thereto. 1A to 12A were produced. Then, using a commercially available film winder, the packaging material for a cell No. 1 was prepared. 1A to 12A were wound such 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 inward.

Packing material for cell No. The number of shots obtained from the laminated film of 100 m of the laminated film having the area exceeding 0.4 mm 2, the number of shots obtained from the winding body, the number of defective shots, the ratio of defective shots, As a result of judgment, the size of the molded part formed on the battery packaging material is shown in Table 1A. A shot is a unit of a packaging material for a battery necessary for manufacturing one cell. In 1A to 12A, a length of 100 mm was taken as one shot. Therefore, for example, a packing material for a battery (5000 shots) for producing 5,000 cells in theory is obtained from a packaging material for a battery having a length of 500 m, but a shot having a convex portion with an area exceeding 0.4 mm 2 is defective. In order to make a wound product into a product, the number of projections having an area of more than 0.4 mm 2 per 100 m of the laminated film is preferably controlled to be 1 or less Do. In addition, in the molding portion of the packaging material for a battery, a battery element enters the battery in a manufacturing process.

[Table 1A]

When the product was judged to be poor in Table 1A, if the product could be used as the product as it is (○), and if the product could not be used as a product with many defects, the product was rated (X).

[Evaluation of electrolytic solution resistance of battery packaging material A]

The packing material for a battery obtained in the above was obtained. 2A, the packing material for a battery was taken out and the defective portions of the coating layer formed by the convex portions of the surface of the sealant layer having the sizes shown in Table 1A were positioned at the center from the positions of the marks, The packaging material for a battery was cut into a size of 100 mm. Then, an electrolytic solution (consisting of a mixed solution of 1M LiPF ₆ , ethylene carbonate, diethyl carbonate and dimethyl carbonate (volume ratio 1: 1: 1)) was passed through the defective portion of the coating layer, After allowing to stand, the electrolytic solution was wiped off with ethanol, and the change of the defective portion was observed. In this case, it was confirmed that there was no change at all, that the substrate layer located under the coating layer was slightly discolored, but the condition as a product was satisfied. DELTA, the substrate layer located under the coating layer was largely discolored, X ". The results are shown in Table 2A.

[Table 2A]

From the results shown in Table 2A, it was found that when the convex portion having an area of 0.4 mm 2 or less in the sealant layer was in contact with the coating layer, the electrolyte resistance did not deteriorate. On the other hand, when the convex portion having an area of more than 0.4 mm 2 in the sealant layer is brought into contact with the coating layer, defects are generated in the coating layer to expose the base layer, and electrolyte resistance deteriorates. From these results, it was found that, in the winding body of the battery packing material A, the size of the convex portion in the sealant layer was controlled to be 0.4 mm 2 or less so that the battery was manufactured using the battery packing material with reduced electrolyte resistance It can be appropriately avoided and the production efficiency of the battery can be improved.

The second type  Of B Example

[Production of packing material for cell B]

A metal layer 3 made of an aluminum foil (thickness: 40 탆) having been chemically treated on both sides was laminated on the base layer 1 made of the stretched nylon film (thickness 25 탆) by the dry lamination method. Specifically, a two-component urethane adhesive (a polyol compound and an aromatic isocyanate compound) was applied to one side of an aluminum foil to form an adhesive layer 2 (thickness 4 탆) on the metal layer 3. Subsequently, the adhesive layer 2 on the metal layer 3 and the base layer 1 are pressurized and bonded to each other, and then subjected to aging treatment at 40 占 폚 for 24 hours to form the base layer 1 / the adhesive layer 2 / (3) was prepared. The chemical conversion treatment of the aluminum foil used as the metal layer 3 is carried out in such a manner that the treatment liquid composed of the phenol resin, the chromium fluoride compound and the phosphoric acid is coated on the aluminum foil 3 by the roll coating method so that the coating amount of chromium is 10 mg / And baking was performed for 20 seconds under the condition that the film temperature was 180 DEG C or higher.

Subsequently, a resin component (a mixed resin of an acid-modified polypropylene resin and a propylene resin) for forming a sealant layer 4 on the metal layer 3 side of the laminate was extruded in a molten state (250 DEG C) A sealant layer 4 (thickness: 50 mu m) was laminated. Next, a two-liquid curing type resin for forming a coating layer 6 on the base layer 1 was applied by a gravure coating method to form a coating layer 6 on the base layer 1 (thickness: 3 m). Thus, a strip-shaped packaging material B for a battery was obtained in which the coating layer 6 / the base layer 1 / the adhesive layer 2 / the metal layer 3 / the sealant layer 4 were laminated in this order.

[Defect Inspection of Battery Packing Material B]

With respect to the packaging material B for a battery obtained above, position information of indentations in an area of 0.03 to 3.1 mm 2 as viewed from the lamination direction of the laminated film is recorded using a commercially available film defect inspection apparatus, and the position is recognized A mark was given in the vicinity of this indentation. The indentations formed on the laminated film included both indentations protruding from the coating layer to the sealant layer and indentations protruding from the sealant layer to the coating layer.

[Production of wrapping material B for battery packaging material]

In the same manner as described above, the packing material for a cell having a width and a length shown in Table 1B and having a mark attached thereto. 1B to 12B. Then, using a commercially available film winding machine, the packaging material for a cell No. 1 was used. 1B to 12B were wound such 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 inward.

Packing material for cell No. 1B to 12B, the number of indentations of the indentation film having an area exceeding 0.2 mm 2 per 100 m of the laminated film, the number of shots obtained from the winding body, the number of defective shots, the ratio of defective shots, Table 1B shows the size of the molded part formed on the packaging material for a battery. A shot is a packaging material for a battery, which is a unit of a packaging material for a battery necessary for producing one battery. 1B to 12B, a length of 100 mm is referred to as one shot. Thus, for example, a packaging material for a battery (5000 shots) for producing 5,000 batteries in theory is obtained from a packaging material for a battery having a length of 500 m, but a shot having an indentation exceeding 0.2 mm 2 in area is defective. The number of projections having an area of more than 0.2 mm 2 per 100 m of the laminated film is preferably controlled to be not more than 1 Do. In addition, in the molding portion of the packaging material for a battery, a battery element enters the battery in a manufacturing process.

[Table 1B]

When the product was judged to be poor in Table 1B, if the product could be used as a product as it is (?), And if the product could not be used as a product with many defects, the product was rated (X).

[Evaluation of electrolytic solution resistance of battery packaging material B]

The packing material for a battery obtained in the above was obtained. The packaging material for a battery was taken out from the winding body of 2B and the defective portions of the coating layer formed by indentations each having the size described in Table 1B were positioned at the center from the positions of the marks, The battery packaging material was cut out. Then, an electrolytic solution (consisting of a mixed solution of 1M LiPF ₆ , ethylene carbonate, diethyl carbonate and dimethyl carbonate (volume ratio 1: 1: 1)) was passed through the defective portion of the coating layer, After allowing to stand, the electrolytic solution was wiped off with ethanol, and the change of the defective portion was observed. At this time, when no change was observed at all, the substrate layer located under the coating layer was slightly discolored, but the condition as a product was satisfied. DELTA, the substrate layer located under the coating layer was largely discolored, X ". The results are shown in Table 2B.

[Table 2B]

From the results shown in Table 2B, it was found that the electrolyte resistance was not deteriorated in the case where indentations with an area of 0.2 mm 2 or less were present. On the other hand, in the case where indentations exceeding 0.2 mm 2 were present, it was found that the coating layer was broken and the base layer was exposed, and the electrolyte resistance was deteriorated. From these results, it is possible to appropriately avoid the production of the battery using the packing material for the battery in which the electrolytic solution resistance is deteriorated by managing the indentation size so that the area is 0.2 mm 2 or less in the winding material for the battery packing material , It can be seen that the production efficiency of the battery can be improved.

Further, when the coating layer where the base layer was discolored was observed, there existed a case where the coating layer protruded and a case where the coating layer was recessed. From these results, it is considered that, as for the defects where the coating layer protrudes, the thickness of the convex portions of the coating layer formed by the indentation becomes thin, and the convex portions come into contact with the sealant layer to cause defects. Further, with respect to the defects at the places where the coating layer is recessed, it is considered that the protrusions of the sealant layer formed by the indentation are pressed against the coating layer, and a defect is formed in the thin coating layer.

Third form  Of C Example

[Production of packing material for cell C]

A metal layer 3 composed of an aluminum foil (thickness: 40 m) having been chemically treated on both sides was laminated on the base layer 1 made of an elongated nylon film (thickness: 25 m) by a dry lamination method. Specifically, a two-component curing type urethane adhesive (a polyol compound and an aromatic isocyanate compound) was applied to one side of an aluminum foil to form an adhesive layer 2 (thickness 4 탆) on the metal layer 3. Subsequently, the adhesive layer 2 on the metal layer 3 and the base layer 1 are pressurized and bonded to each other, and then subjected to aging treatment at 40 占 폚 for 24 hours to form the base layer 1 / the adhesive layer 2 / (3) was prepared. The chemical conversion treatment of the aluminum foil used as the metal layer 3 is carried out in such a manner that the treatment liquid composed of the phenol resin, the chromium fluoride compound and the phosphoric acid is coated on the aluminum foil 3 by the roll coating method so that the coating amount of chromium is 10 mg / , And baking was performed for 20 seconds under the condition that the coating temperature was 180 DEG C or higher.

Subsequently, a resin component (a mixed resin of an acid-modified polypropylene resin and a propylene resin) for forming a sealant layer 4 on the metal layer 3 side of the laminate was extruded in a molten state (250 DEG C) A sealant layer 4 (thickness: 45 mu m) was laminated. Thus, a strip-shaped packaging material C for a cell was obtained which was formed of a laminated film in which the base layer 1 / the adhesive layer 2 / the metal layer 3 / the sealant layer 4 were stacked in this order.

[Defect Inspection of Battery Packing Material C]

With respect to the packaging material C for a battery obtained above, positional information of a foreign object having an area in a range of 0.03 to 3.1 mm 2 viewed from the lamination direction of the laminated film is recorded using a commercially available film defect inspection apparatus, and the position is recognized A mark was given in the vicinity of these foreign objects.

[Measurement of number of generated pinholes by molding] A:

From the positions of the marks of the packaging material C for a battery obtained above, one package having the size described in Table 1C was positioned at the center, and the packaging material C for a battery was cut into a size of 100 mm x 100 mm, As a sample. As the test sample, a foreign object existing in the interface portion (including the adhesive layer) between the adhesive layer and the metal layer was used. Subsequently, the above-mentioned test sample was placed on a female mold so that the thermo-adhesive resin layer side was located on the male mold side, using a straight mold made of a male mold having a rectangular shape of 20 mm x 30 mm and a female mold having a clearance of 0.5 mm between the male mold and the female mold , And the test sample was pressed at a pressing pressure (surface pressure) of 0.4 MPa so that the forming depth would be 6 mm, and cold forming (single-inlet molding) was carried out. The occurrence of pinholes in the metal layer in the molded packaging material C was confirmed and the number of pinholes generated was measured. The number of occurrence of pinholes was determined as a molding defect (×) when the pinhole was seen after the above molding, and the molded product (○) where the pinhole was not seen, and the presence or absence of the pinhole was confirmed with respect to 10 test samples. The results are shown in Table 1C.

[Table 1C]

[Measurement of pinhole generation number by molding B]

Two foreign substances (all located in the interface portion (including the adhesive layer) of the adhesive layer and the metal layer) having the size described in Table 2C are positioned at the center portion from the positions of the marks of the packaging material C for a battery obtained above A pinhole caused by molding was formed in the same manner as in the measurement A except that the packing material C for a battery was cut out to a size of 100 mm x 100 mm and the number of test samples was 5, And the number of samples was measured. The results are shown in Table 2C.

[Table 2C]

[Measurement of Pinhole Generated Water by Molding C]

Except that in the production of the packaging material for a battery C, two layers of a carboxylic acid-modified polypropylene layer (22.5 占 퐉) and a polypropylene layer (22.5 占 퐉) were laminated in this order from the metal layer side as a sealant layer To prepare a packaging material C for a battery. The battery packaging material C obtained here was marked in the vicinity of the foreign object in the same manner as the defect inspection described above. Subsequently, the packaging material for a battery was cut into a size of 100 mm x 100 mm with the foreign substance (located at the interface portion between the sealant layer and the metal layer) having the size described in Table 3C, respectively, The pinhole generation number was measured by molding in the same manner as the measurement A except that the test sample was used. The results are shown in Table 3C.

[Table 3C]

[Measurement of pinhole generation number by molding]

Two foreign substances (all located at the interface portion between the sealant layer and the metal layer) having the size described in Table 4C were positioned at the center portion from the mark positions of the above-mentioned cell packing material C, The number of pinhole generated by molding was measured in the same manner as in Measurement A except that the packaging material C for a cell was cut out to a size of 100 mm and the number of test samples was 5. The results are shown in Table 4C.

[Table 4C]

From the results shown in Tables 1C to 4C, it has been found that pinholes due to molding are less likely to occur when foreign matter having an area smaller than 0.4 mm < 2 > exists at the interface portion of the laminated film. On the other hand, it has been found that when foreign matter having an area of 0.4 mm < 2 > or more exists at the interface portion of the laminated film, pinholes are likely to occur due to molding. As a result, the size of the foreign matter existing at the interface portion of the laminated film in the wrapping material C of the battery packing material was controlled to be 0.4 mm 2 or less so that the packing material C for the battery, It is possible to appropriately avoid the production of the battery, and it is understood that the production efficiency of the battery can be improved.

[Preparation of wrapping material CA of battery packing material]

The cell packaging material No. 1 having the width and the length of Table 5C and having the mark attached thereto was prepared in the same manner as in the production of the above-mentioned cell packing material and defect inspection. 1CA to 12CA were produced. Then, using a commercially available film winder, the packaging material for a cell No. 1 was prepared. 1CA to 12CA were wound so that the sealant layer was inward. Also, the packing material for cell No. 1 was used. As the 1CA to 12CA, those in which foreign matters existed in the interface portion (including the adhesive layer) between the adhesive layer and the metal layer among the laminated films produced by the above method were selected.

Packing material for cell No. The number of shots obtained from the rolls, the number of defective shots, the ratio of defective shots, and whether or not the product can be made into a product can be determined for each of the rolls of 1CA to 12CA As a result of the determination, the size of the molded portion formed on the battery packaging material is shown in Table 5C. A shot is a unit of a packaging material for a battery necessary for manufacturing one cell, and is a packaging material for a battery. In the 1CA to 12CA, a length of 100 mm was taken as one shot. Therefore, for example, a packaging material for a battery (5000 shots) for producing 5,000 batteries in theory can be obtained from a packaging material for a battery having a length of 500 m. However, a shot in which an object having an area of 0.4 mm 2 or more is located is defective. The number of defective shots with many defective shots significantly decreases the production efficiency of the battery. Therefore, in order to make the wound product into a product, it is preferable that the number of foreign matter having an area of 0.4 mm 2 or more per 100 m of the laminated film is controlled to be 1 or less. In addition, in the molding portion of the packaging material for a battery, a battery element enters the battery in a manufacturing process.

[Table 5C]

When the product was judged to be poor in Table 1C, the product was judged as (O) when the product could be used as it was, and (X) when the product was not available as a product with many defects.

[Production of wrapping material CB of battery packing material]

In the same manner as described above, the packing material for a cell having the width and length shown in Table 6C and having the mark attached thereto. 1CB to 12CB were produced. Then, using a commercially available film winder, the packaging material for a cell No. 1 was prepared. 1CB to 12CB were wound so that the sealant layer was inward. Also, the packing material for cell No. 1 was used. As 1CB to 12CB, among the laminated films produced by the above method, those in which foreign substances existed at the interfaces between the metal layer and the sealant layer were selected.

Packing material for cell No. The number of shots obtained from the winding body, the number of defective shots, the ratio of defective shots, and whether or not the product can be made into a product can be determined for each of the rolls of 1CB to 12CB As a result of the determination, the size of the molding portion formed on the battery packaging material is shown in Table 6C.

[Table 6C]

1: substrate layer
2: Adhesive layer
3: metal layer
4: sealant layer
5: Adhesive layer
6: Coating layer
7: indentation
8: Foreign matter

Claims (42)

A wrapping material for a battery packaging material comprising at least a laminated film in which a coating layer, a base layer, a metal layer, and a sealant layer are laminated in this order,
The coating layer is formed of a two-liquid curable resin,
The sealant layer is formed by melt-extruded thermoplastic resin,
Wherein the sealant layer comprises a foreign matter or an unmelted material of the thermoplastic resin,
The convex portion resulting from the foreign matter or the unmelted material on the surface of the sealant layer is formed so that the position of the convex portion having an area of more than 0.4 mm 2 when viewed from the lamination direction of the laminated film can be recognized, A mark is given to the mark,
Wherein the winding body is wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other. The method according to claim 1,
Wherein the thickness of the coating layer is 5 占 퐉 or less. 3. The method according to claim 1 or 2,
Wherein the laminated film has a thickness of 200 mu m or less. 4. The method according to any one of claims 1 to 3,
Wherein a height of the convex portion is 2 占 퐉 or more. 5. The method according to any one of claims 1 to 4,
The roll of the wrapping material for a battery has a roll shape in which the length of the laminated film is 200 m or more and the diameter of the circular cross section is 150 mm or more. A method for manufacturing a wrapping body of a packaging material for a battery according to any one of claims 1 to 5,
A step of forming a metal layer on one surface of the substrate layer;
Extruding a thermoplastic resin onto the metal layer to form the sealant layer;
A step of forming a coating layer by applying a two-liquid curable resin on the surface of the base layer opposite to the metal layer
To obtain a laminated film, and then,
In the laminated film, it is preferable that, as the convex portion due to the foreign matter or the unmelted substance contained in the sealant layer, the position of the convex portion having an area of more than 0.4 mm 2 when viewed from the lamination direction of the laminated film can be recognized A mark imparting step of applying a mark to the laminated film,
A winding step of winding the laminated film so that the surface of the sealant layer and the surface of the coating layer come into contact with each other to obtain a winding body
And winding the wrapping material on the wrapping material. A wrapping material for a battery packaging material comprising at least a laminated film in which a coating layer, a base layer, a metal layer, and a sealant layer are laminated in this order,
The coating layer is formed of a two-liquid curable resin,
The sealant layer is formed by melt-extruded thermoplastic resin,
Wherein the sealant layer comprises a foreign matter or an unmelted material of the thermoplastic resin,
Wherein the number of convexities of the convex portion originating from the foreign matter or the unmelted matter on the surface of the sealant layer and having an area of more than 0.4 mm 2 when viewed from the stacking direction of the laminated film is 80 to 600 mm, The length of the film is less than one per 100 m,
Wherein the winding body is wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other. 8. The method of claim 7,
Wherein the thickness of the coating layer is 5 占 퐉 or less. 9. The method according to claim 7 or 8,
Wherein the laminated film has a thickness of 200 mu m or less. 10. The method according to any one of claims 7 to 9,
Wherein a height of the convex portion is 2 占 퐉 or more. 11. The method according to any one of claims 7 to 10,
The roll of the wrapping material for a battery has a roll shape in which the length of the laminated film is 200 m or more and the diameter of the circular cross section is 150 mm or more. 11. A method for manufacturing a wrapping body of a packaging material for a battery according to any one of claims 7 to 11,
A step of forming a metal layer on one surface of the substrate layer;
Extruding a thermoplastic resin onto the metal layer to form the sealant layer;
A step of applying a two-liquid curable resin on the side of the substrate layer opposite to the metal layer to form the coating layer
To obtain a laminated film, and then,
In the laminated film, as the convex portion due to the foreign matter or the unmelted substance contained in the sealant layer, a portion where the convex portion having an area larger than 0.4 mm 2 as viewed from the stacking direction of the laminated film is removed A convex portion removing step of making the number of convex portions having an area of more than 0.4 mm 2 to be not more than one per 100 m of the laminated film having a width of 80 to 600 mm,
A winding step of winding the laminated film so that the surface of the sealant layer and the surface of the coating layer come into contact with each other to obtain a winding body
And winding the wrapping material on the wrapping material. The method according to claim 6,
And a step of applying a mark to the laminated film so as to recognize the position of the convex portion whose area of the laminated film exceeds 0.4 mm 2 in the convex portion removing step, Way. At least a coating layer formed of a two-liquid curable resin, a base layer, a metal layer, and a sealant layer formed of a melt-extruded thermoplastic resin and containing foreign matter or an unmelted material of the thermoplastic resin in this order The method for inspecting defects of a packaging material for a battery,
A step of photographing the surface of the sealant layer and recording the positional information of the foreign object or the convexity caused by the unmelted material having an area exceeding 0.4 mm 2 when viewed from the lamination direction of the laminated film;
A step of providing a mark to the laminated film so that the position of the convex portion whose area exceeds 0.4 mm 2 can be recognized in accordance with the positional information
And inspecting a defect in the packaging material for a battery. A wrapping material for a battery packaging material comprising at least a laminated film in which a coating layer, a base layer, a metal layer, and a sealant layer are laminated in this order,
The coating layer is formed of a two-liquid curable resin,
Wherein the laminated film has an indentation protruding from the coating layer to the sealant layer or an indentation protruding from the sealant layer to the coating layer,
A mark is provided on the laminated film so that the position of the indentation exceeding 0.2 mm 2 when viewed from the lamination direction of the laminated film can be recognized,
Wherein the winding body is wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other. 16. The method of claim 15,
Wherein the thickness of the coating layer is 5 占 퐉 or less. 17. The method according to claim 15 or 16,
Wherein the laminated film has a thickness of 200 mu m or less. 18. The method according to any one of claims 15 to 17,
And the height of the indentations protruding toward the sealant layer is 2 占 퐉 or more. 19. The method according to any one of claims 15 to 18,
The roll of the wrapping material for a battery has a roll shape in which the length of the laminated film is 200 m or more and the diameter of the circular cross section is 150 mm or more. A method for manufacturing a wrapping body of a packaging material for a battery according to any one of claims 15 to 19,
A step of laminating a base layer, a metal layer, and a sealant layer;
A step of forming a coating layer by applying a two-liquid curable resin on the surface of the base layer opposite to the metal layer
To obtain a laminated film, and then,
The indentations protruding from the coating layer to the sealant layer or the indentations protruding from the sealant layer to the coating layer are formed so that the position of the indentation exceeding 0.2 mm 2 when viewed from the lamination direction of the laminated film can be recognized, A mark applying step of applying a mark to the laminated film,
A winding step of winding the laminated film so that the surface of the sealant layer and the surface of the coating layer come into contact with each other to obtain a winding body
And winding the wrapping material on the wrapping material. A wrapping material for a battery packaging material comprising at least a laminated film in which a coating layer, a base layer, a metal layer, and a sealant layer are laminated in this order,
The coating layer is formed of a two-liquid curable resin,
Wherein the laminated film has an indentation protruding from the coating layer to the sealant layer or an indentation protruding from the sealant layer to the coating layer,
Wherein the number of indentations having an area of more than 0.2 mm 2 when viewed from the lamination direction of the laminated film on the surface of the laminated film is not more than 1 per 100 m of the length of the laminated film having a width of 80 to 600 mm,
Wherein the winding body is wound so that the surface of the sealant layer and the surface of the coating layer are in contact with each other. 22. The method of claim 21,
Wherein the thickness of the coating layer is 5 占 퐉 or less. 23. The method of claim 21 or 22,
Wherein the laminated film has a thickness of 200 mu m or less. 24. The method according to any one of claims 21 to 23,
And the height of the indentations protruding toward the sealant layer is 2 占 퐉 or more. 25. The method according to any one of claims 21 to 24,
The roll of the wrapping material for a battery has a roll shape in which the length of the laminated film is 200 m or more and the diameter of the circular cross section is 150 mm or more. 26. A method for manufacturing a wrapping body of a packaging material for a battery according to any one of claims 21 to 25,
A step of laminating a base layer, a metal layer, and a sealant layer;
A step of forming a coating layer by applying a two-liquid curable resin on the surface of the base layer opposite to the metal layer
To obtain a laminated film, and then,
Removing indentations protruding from the coating layer to the sealant layer or indentations protruding from the sealant layer to the coating layer and having indentations exceeding 0.2 mm 2 as viewed from the lamination direction of the laminated film, An indentation removing step of making the number of indentations having an area of more than 0.2 mm 2 to be not more than one per 100 m of the length of the laminated film having a width of 80 to 600 mm,
A winding step of winding the laminated film so that the surface of the sealant layer and the surface of the coating layer come into contact with each other to obtain a winding body
And winding the wrapping material on the wrapping material. 27. The method of claim 26,
And a step of applying a mark to the laminated film so as to recognize the position of the indentation in which the area of the laminated film exceeds 0.2 mm 2 in the indentation removal step . A defect inspection method for a packaging material for a battery comprising a laminated film in which a coating layer formed of a two-liquid curable resin, a base layer, a metal layer, and a sealant layer are stacked in this order,
An indentation protruding from the coating layer to the sealant layer or an indentation protruding from the sealant layer to the coating layer is formed as an indentation in which the surface of the sealant layer is imaged, A step of recording the position information of the recording medium,
A step of providing a mark to the laminated film so as to recognize the position of the indentation in which the area exceeds 0.2 mm 2 in accordance with the positional information
And inspecting a defect in the packaging material for a battery. A wrapping material for a battery packaging material comprising at least a laminated film in which a base layer, an adhesive layer, a metal layer, and a sealant layer are laminated in this order,
Foreign matter having an area of 0.4 mm < 2 > or more when viewed from the stacking direction of the laminated film is present in the interface portion of at least two layers included in the laminated film,
And a mark is provided on the laminated film so as to recognize the position of the foreign matter. 30. The method of claim 29,
Wherein the foreign matter is present in at least an interface portion of the base layer and the adhesive layer, an interface portion of the adhesive layer and the metal layer, or an interface portion of the metal layer and the sealant layer in the adhesive layer, . 32. The method 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. 32. The method according to any one of claims 29 to 31,
Wherein the laminated film has a coating layer on the side opposite to the adhesive layer of the base layer,
Wherein the foreign matter is present at an interface portion between the coating layer and the base layer. 33. The method according to any one of claims 29 to 32,
The roll of the wrapping material for a battery has a roll shape in which the length of the laminated film is 200 m or more and the diameter of the circular cross section is 150 mm or more. 33. A method for manufacturing a wrapping body of a packaging material for a battery according to any one of claims 29 to 33,
A laminated film is obtained by a lamination step of laminating a base layer, an adhesive layer, a metal layer and a sealant layer,
A mark is given to the laminated film so that the foreign matter contained in the interface portion of at least two layers included in the laminated film and the position of the foreign object having an area of 0.4 mm 2 or more when viewed from the lamination direction of the laminated film can be recognized A mark adding step of,
A winding step of winding the laminated film to obtain a winding body
And winding the wrapping material on the wrapping material. A wrapping material for a battery packaging material comprising at least a laminated film in which a base layer, an adhesive layer, a metal layer, and a sealant layer are laminated in this order,
Wherein the number of foreign matter having an area of at least 0.4 mm 2 as viewed from the lamination direction of the laminated film in the interface portion of at least two layers included in the laminated film is one per 100 m of the laminated film having a width of 80 to 600 mm By mass of the battery pack material. 36. The method of claim 35,
Wherein the foreign matter is present in at least an interface portion of the base layer and the adhesive layer, an interface portion of the adhesive layer and the metal layer, or an interface portion of the metal layer and the sealant layer in the adhesive layer, . 37. The method of 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. 37. The method according to any one of claims 35 to 37,
Wherein the laminated film has a coating layer on the side opposite to the adhesive layer of the base layer,
Wherein the foreign matter is present at an interface portion between the coating layer and the base layer. 39. The method according to any one of claims 35 to 38,
The roll of the wrapping material for a battery has a roll shape in which the length of the laminated film is 200 m or more and the diameter of the circular cross section is 150 mm or more. 39. A method of manufacturing a wrapping body of a packaging material for a battery according to any one of claims 35 to 39,
A laminated film is obtained by a lamination step of laminating a base layer, an adhesive layer, a metal layer and a sealant layer,
A portion of foreign matter contained 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 is removed, A number of times per 100 m of the laminated film having a width of 80 to 600 mm,
A winding step of winding the laminated film to obtain a winding body
And winding the wrapping material on the wrapping material. 41. The method of claim 40,
And a mark applying step of applying a mark to the laminated film so as to recognize the position of the foreign matter having the area of 0.4 mm 2 or more in the laminated film in the foreign substance removing step . A defect inspection method for a packaging material for a battery comprising a laminated film in which a base layer, an adhesive layer, a metal layer, and a sealant layer are laminated in this order,
A step of photographing the surface of the laminated film and recording the positional information of the foreign object which exists in the interface portion of at least two layers included in the laminated film and has an area of 0.4 mm 2 or more when viewed from the lamination direction of the laminated film; ,
A mark giving step of giving a mark to the laminated film so that the position of the foreign object having the area of 0.4 mm 2 or more can be recognized in accordance with the positional information
And inspecting a defect in the packaging material for a battery.

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