COIN-SHAPED BATTERY

摘要

A coin-shaped battery comprising a battery can (1) having crimp portion (14) around the periphery of a bottom surface (1a), a port-sealing plate (2) having a flange portion (6) formed with an extended portion (7) and a turn-up portion (8), the battery can (1) and port-sealing plate (2) having their ports sealed by crimping operation through a gasket (3), whereby the gasket (3) is compressed between a crimp portion (14) of U-shaped cross section, the flange portion (6), the extended portion (7) and turn-up portion (8), effecting reliable port-sealing, thus making possible the dispersion of a deformation pressure caused by the bulging of the battery can (1) and port-sealing plate (2) concomitant with a rise in the internal pressure of the battery under severe working conditions including high temperature; thus, the coin-shaped battery has an improved liquid leak prevention property in the port-sealing portion.