Packaging material for battery case and battery case
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.
1. 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 heat resistant resin oriented film layer and the thermoplastic resin non-oriented film layer,
wherein the heat resistant resin oriented film has a shrinkage percentage of 5 to 10%.
2. 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 heat resistant resin oriented film layer and the thermoplastic resin non-oriented film layer,
wherein the heat resistant resin oriented film layer is one of a biaxially-oriented polyamide film having a shrinkage percentage of 5 to 10%, a biaxially-oriented polyethylene naphthalate having a shrinkage percentage of 5 to 10%, and a biaxially-oriented polyethylene terephthalate having a shrinkage percentage of 5 to 10%.
3. The packaging material for battery cases according to claim 1 , wherein a thickness of the heat resistant 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.
4. The packaging material for battery cases according to claim 1 , wherein the heat resistant resin oriented film layer and the aluminum foil layer are integrally laminated via a urethane series adhesive layer.
5. A battery case obtained by subjecting the packaging material according to claim 1 to deep drawing or stretch forming.
6. The packaging material for battery cases according to claim 2 , wherein a thickness of the heat resistant 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.
7. The packaging material for battery cases according to claim 2 , wherein the heat resistant resin oriented film layer and the aluminum foil layer are integrally laminated via a urethane series adhesive layer.
8. A battery case obtained by subjecting the packaging material according to claim 2 to deep drawing or stretch forming.