Dry cell.

摘要

A dry cell which is so arranged that, with a bottom plate (4) being disposed at the lower portion of a raw cell sealed at its opening (1) by a sealing member (2), an insulative seal packing (5) is applied onto the peripheral portion of the bottom plate (4), while the raw cell and the peripheral portion of the bottom plate (4) are surrounded by a metal jacket (10) welded by laser at its butted opposite ends. At the peripheral portion of the bottom plate (4), a gas discharge mechanism is formed which is arranged to be normally closed by the seal packing (5), and to be released from the closing by the seal packing (5) due to deformation of the bottom plate (4) upon increase of internal pressure of the dry cell for discharging the gas within the dry cell outside, and thus, a safe dry cell free from a danger of rupture maybe provided.