Patent ID: 7706127
Filing Date: 2010-04-27
Classification: H01G,Y02E,Y02T

Abstract:
1. A capacitor comprising: a capacitor element having a pair of positive and negative electrodes, the pair of positive and negative electrodes being disposed in opposite directions and wound together with a separator interposed therebetween, the pair of positive and negative electrodes being each composed of a current collector made of metal foil and a polarizable electrode layer formed thereon; a bottomed cylindrical metal case accommodating the capacitor element together with a driving electrolyte, the metal case being joined to one of the pair of positive and negative electrodes at an inner bottom surface thereof; and a terminal plate joined to the other of the pair of positive and negative electrodes at an inner surface thereof so as to seal an opening of the metal case, the terminal plate being provided with a pressure regulating valve functioning also as a driving-electrolyte filling hole, wherein the pressure regulating valve comprises: a ring-shaped elastic member; a gas-permeable sheet sealedly joined to the upper surface of the elastic member; a rubber valve body disposed on the gas-permeable sheet; and a cap for holding the valve body in a compressed state, the elastic member being pressed into an annular wall formed in an upper portion of a periphery of the hole of the terminal plate.