NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND ELECTRIC DOUBLE LAYER CAPACITOR

摘要

PROBLEM TO BE SOLVED: To provide a battery that does not cause liquid leakage or degradation of a characteristic during storage. SOLUTION: A standing part in a groove of a gasket made of fluororesin having a U or J shaped groove is provided with a plurality of projections that do not reach a plat plane positioned on the lowest part or the bottom of the groove. The plat plane is formed on the bottom of the U or J shaped groove, and an angle between the plat plane and a standing surface standing from the plat plane is taken as radius 0.1 mm or less.