# US 8,541,080 B2 · Packaging material for battery case and battery case

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- Number: US 8,541,080 B2
- Document ID: US8541080B2
- Status: Granted
- Kind: B2
- Application number: 13/299,017
- Filed: 2011-11-17
- Published: 2012-03-15
- Granted: 2013-09-24
- Earliest claimed: 2005-05-27
- Assignees: Showa Denko Packaging Co., Ltd.
- Applicants: Hiroshi Hata
- Inventors: Hiroshi Hata
- Web page: https://patentgrep.com/patent/US8541080B2

## CPC

- H01M 50/1243: {characterised by the internal coating on the casing}
- H01M 50/119: Metals
- H01M 50/121: Organic material
- H01M 50/129: with two or more layers of only organic material
- H01M 50/133: Thickness
- Y02E 60/10: Energy storage using batteries
- Y10T 428/13: Hollow or container type article [e.g., tube, vase, etc.]
- Y10T 428/1303: Paper containing [e.g., paperboard, cardboard, fiberboard, etc.]
- Y10T 428/1352: Polymer or resin containing [i.e., natural or synthetic]
- Y10T 428/1359: Three or more layers [continuous layer]
- Y10T 428/139: Open-ended, self-supporting conduit, cylinder, or tube-type article
- Y10T 428/2495: Thickness [relative or absolute]
- Y10T 428/24975: No layer or component greater than 5 mils thick
- Y10T 428/31678: Of metal
- Y10T 428/31692: Next to addition polymer from unsaturated monomers
- Y10T 428/31765: Inorganic-containing or next to inorganic-containing
- Y10T 428/31855: Of addition polymer from unsaturated monomers
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A packaging material for battery cases according to the present invention including a heat resistant resin oriented film layer 2 constituting an outer layer, a thermoplastic resin non-oriented film layer 3 constituting an inner layer, and an aluminum foil layer 4 disposed between both the film layers is characterized in that as the heat resistant resin oriented film, a heat resistant resin oriented film having a shrinkage percentage of 2 to 20% is used. With this packaging material, excellent formability can be secured without coating slip characteristics imparting components and sufficient volumetric energy density can be obtained.

## Claims

### Claim 1

A battery case comprising
a packaging material for battery cases comprising:
a heat resistant resin oriented film layer constituting an outer layer;
a thermoplastic resin non-oriented film layer constituting an inner layer; and
an aluminum foil layer disposed between the inner and outer layers,
wherein the heat resistant resin oriented film comprises a biaxially-oriented polyamide film having a shrinkage percentage of 2 to 20%,
wherein the shrinkage percentage denotes a size change rate of a test piece in the oriented direction before and after the immersion of the test piece (10 cm×10 cm) of the biaxially oriented polyamide film in 95° C. hot water for 30 minutes, and can be obtained by the following equation, which is an average value of the size change rates in two oriented directions:
shrinkage percentage(%)={(X−Y)/X}×100
X: oriented directional size before the immersion treatment
Y: oriented directional size after the immersion treatment,
wherein a thickness of the biaxially-oriented polyamide film layer is 12 to 50 μm, a thickness of the thermoplastic resin non-oriented film layer is 20 to 80 μm and a thickness of the aluminum foil layer is 5 to 50 μm,
wherein the biaxially-oriented polyamide film layer and the aluminum foil layer are integrally laminated via a urethane series adhesive layer,
wherein the aluminum foil layer and the thermoplastic resin non-oriented film layer are integrally laminated via an acid-modified polyolefin adhesive layer, and
a deep drawing or stretch forming is performed on the packaging material for battery cases.

### Claim 2

A battery case comprising:
a packaging material for battery cases comprising:
a heat resistant resin oriented film layer constituting an outer layer;
a thermoplastic resin non-oriented film layer constituting an inner layer; and
an aluminum foil layer disposed between the inner and outer layers,
wherein the heat resistant resin oriented film comprises a biaxially-oriented polyethylene terephthalate film having a shrinkage percentage of 2 to 20%, wherein the shrinkage percentage denotes a size change rate of a test piece in the oriented direction before and after the immersion of the test piece (10 cm×10 cm) of the biaxially-oriented polyethylene terephthalate film in 95° C. hot water for 30 minutes, and can be obtained by the following equation, which is an average value of the size change rates in two oriented
directions:
shrinkage percentage(%)={(X−Y)/X}×100
X: oriented directional size before the immersion treatment
Y: oriented directional size after the immersion treatment,
wherein a thickness of the biaxially-oriented polyethylene terephthalate film layer is 12 to 50 μm, a thickness of the thermoplastic resin non-oriented film layer is 20 to 80 μm and a thickness of the aluminum foil layer is 5 to 50 μm,
wherein the biaxially-oriented polyethylene terephthalate film layer and the aluminum foil layer are integrally laminated via a urethane series adhesive layer, wherein the aluminum foil layer and the thermoplastic resin non-oriented film layer are integrally laminated via an acid-modified polyolefin adhesive layer, and
a deep drawing or stretch forming is performed on the packaging material for battery cases.

### Claim 3

A battery case comprising:
a packaging material for battery cases comprising:
a heat resistant resin oriented film layer constituting an outer layer;
a thermoplastic resin non-oriented film layer constituting an inner layer; and
an aluminum foil layer disposed between the inner and outer layers,
wherein the heat resistant resin oriented film comprises a biaxially-oriented polyethylene naphthalate film having a shrinkage percentage of 2 to 20%,
wherein the shrinkage percentage denotes a size change rate of a test piece in the oriented direction before and after the immersion of the test piece (10 cm×10 cm) of the biaxially-oriented polyethylene naphthalate film in 95° C. hot water for 30 minutes, and can be obtained by the following equation, which is an average value of the size change rates in two oriented directions:
shrinkage percentage(%)={(X−Y)/X}×100
X: oriented directional size before the immersion treatment
Y: oriented directional size after the immersion treatment,
wherein a thickness of the biaxially-oriented polyethylene naphthalate film layer is 12 to 50 μm, a thickness of the thermoplastic resin non-oriented film layer is 20 to 80 μm and a thickness of the aluminum foil layer is 5 to 50 μm,
wherein the biaxially-oriented polyethylene naphthalate film layer and the aluminum foil layer are integrally laminated via a urethane series adhesive layer, wherein the aluminum foil layer and the thermoplastic resin non-oriented film layer are integrally laminated via an acid-modified polyolefin adhesive layer, and
a deep drawing or stretch forming is performed on the packaging material for battery cases.

### Claim 4

A battery case comprising:
a packaging material for battery cases comprising:
a heat resistant resin oriented film layer constituting an outer layer;
a thermoplastic resin non-oriented film layer constituting an inner layer; and
an aluminum foil layer disposed between the inner and outer layers,
wherein the heat resistant resin oriented film is a multiple layer comprising a plurality of films selected from a biaxially-oriented polyamide film having a shrinkage percentage of 2 to 20%, a biaxially-oriented polyethylene terephthalate film having a shrinkage percentage of 2 to 20% and a biaxially-oriented polyethylene naphthalate film having a shrinkage percentage of 2 to 20%,
wherein the shrinkage percentage denotes a size change rate of a test piece in the oriented direction before and after the immersion of the test piece (10 cm×10 cm) of the heat resistant resin oriented film in 95° C. hot water for 30 minutes, and can be obtained by the following equation, which is an average value of the size change rates in two oriented directions:
shrinkage percentage(%)={(X−Y)/X}×100
X: oriented directional size before the immersion treatment
Y: oriented directional size after the immersion treatment,
wherein a thickness of the heat resistant resin oriented film layer is 12 to 50 μm, a thickness of the thermoplastic resin non-oriented film layer is 20 to 80 μm and a thickness of the aluminum foil layer is 5 to 50 μm,
wherein the heat resistant resin oriented film layer and
the aluminum foil layer are integrally laminated via a urethane series adhesive layer, wherein the aluminum foil layer and the thermoplastic resin non-oriented film layer are integrally laminated via an acid-modified polyolefin adhesive layer, and
a deep drawing or stretch forming is performed on the packaging material for battery cases.