Patent ID: 6258477
Filing Date: 2001-07-10
Classification: H01M,Y02E,Y02P

Abstract:
A method of setting rupture pressure of an explosion-proof non-aqueous secondary battery including a sealing part provided with a pair of upper and lower vent plates mechanically and electrically coupled with each other, wherein the mechanical coupling between said pair of upper and lower vent plates ruptures thus cutting off an electric current in the event the internal pressure of a battery case increased beyond a predetermined value, and in the event the internal pressure of the battery case subsequently further increased beyond a predetermined value, an easy-to-rupture portion formed on the upper vent plate ruptures thus releasing the gas inside the battery case to outside, and the rupture pressure at which the mechanical coupling between said pair of upper and lower vent plates ruptures has been set to decrease as the sspatial volume occupancy ratio of the battery increases.