Coin-shaped battery and method for producing the same

The present invention relates to a coin-shaped battery suitable for power sources and the like in thin electronic devices, and to a method for producing such a coin-shaped battery. A gasket-integrated case is obtained by punching out a circular piece from a metal sheet on which a gasket resin film having a round hole is integrally laminated with an adhesive, in such a way as to have a diameter concentric with, but larger than, the round hole, and by drawing the circular piece into a bottomed cylindrical shape. Elements for electromotive force and a sealing plate are then disposed on the case, and the periphery of the sealing plate is sandwiched and sealed by the periphery of the case by crimping, with a gasket including the resin film interposed therebetween, so that a coin-shaped battery is formed. The resin film has a thickness in the range of 20 m to 150 m and a modulus of elasticity equal to or greater than 35 kgf/mm.