Hermetically sealed storage battery

摘要

PCT No. PCT/JP84/00538 Sec. 371 Date Jun. 30, 1986 Sec. 102(e) Date Jun. 30, 1986 PCT Filed Nov. 8, 1984 PCT Pub. No. WO86/03060 PCT Pub. Date May 22, 1986.A hermetically sealed storage battery has a group of plates sheathed with a housing which is constituted by a synthetic resin film or sheet that is resistant to the electrolyte and is heat-weldable. Portions of the housing which surround the periphery of the group of plates are formed into a sealing portion by heat-welding together films or sheets of the type described above. A pair of terminal pieces protrude from the group of plates through the sealing portion. Part of the sealing portion is provided with safety valve which is constituted by an adhesion portion formed by portions of the films or sheets which are overlaid one upon the other. Thus it is possible to provide a hermetically sealed storage battery which has a simplified housing structure and which is capable of smoothly discharging any gas to the outside when there is an increase in the cell's internal pressure.