Patent ID: 8697277
Filing Date: 2014-04-15
Classification: B29C,B29L,H01G,H01M,Y02E,Y02P,Y10T

Abstract:
1. A film covered battery composed of battery elements having a configuration in which a positive electrode faces a negative electrode, and a covering film having at least a heat-seal resin layer and a thin metal film layer that are laminated by a laminate protection film layer, for encapsulating said battery element with said heat-seal resin layer being positioned inside, and sealing said battery element by heat-sealing a joint section along a peripheral edge, said joint section having at least one folded side, said film-covered battery characterized in that said joint section is formed with at least one fold, and said fold has a thickness smaller than a thickness around said fold, wherein said fold has a thickness of said heat-seal resin layer smaller than a thickness of said heat-seal resin layer around said fold, wherein the laminate protection film layer has a uniform thickness along said joint section in a direction perpendicular to said fold.