Patent ID: 7563535

Claim:
A battery pack comprising a cell main body in which a cell element using a solid state electrolyte or a gel form electrolyte as an electrolyte is contained inside an insulating film sheath material; a box-shaped outer metal case with one end face open, and a cap fitted to said open face of said outer case, wherein the clearance between the outer case, and the cell main body is reduced to substantially zero, wherein the insulating film sheath material is comprised of an aluminum laminated film in which an insulating resin layer, a metallic foil comprised of aluminum and a thermofusing resin layer are laminated in this order and adhered to each other; said cell main body is contained in said outer case, and fitting projected portions are provided on a side of the cap, whereas fitting hole portions are provided on the side of the outer case, and said open face of said outer case is closed with said cap, and further wherein the cap fits entirely within the open face of the outer case and the cap has a recess portion provided therein for a circuit portion.