Patent ID: 7608359

Claim:
A battery, comprising: a battery element including a cathode, an anode, and an electrolyte; and a film-shaped case accommodating said battery element including a) a sealing portion disposed in a edge portion of the case and having a width of 1 mm to 5 mm, b) a metal layer, c) a first resin layer disposed on the side of the metal layer closest to the battery element with a thermoplastic layer in between the metal layer and the first resin layer, and d) a second resin layer disposed on the side of the metal layer farthest from the battery element with an adhesive layer in between the metal layer and the second resin layer; wherein, the thermoplastic layer has a thickness of 50 μm or less, the resin piece is disposed between the casing and the cathode terminal of the battery element and between the casing and the anode terminal of the battery element to prevent the entry of air, and the adhesive layer has a thickness of 20 μm or less and the adhesive of the adhesive layer includes at least two selected from a group of acrylic adhesives and polyurethane adhesives.