Patent ID: 6603653
Filing Date: 2003-08-05
Classification: H01G,Y02E

Abstract:
An electric double layer capacitor comprising: an electrode rolled body formed by overlapping one of electrode plates on the other of electrode plates and winding the same in a rolled manner; a bottomed, cylindrical-shaped outer packaging can containing therein the electrode rolled body and connected electrically to one end of the one of the electrode plates; a collecting plate connected electrically to the other of the electrode plates of the electrode rolled body contained in the outer packaging can; and a cover covering the outer packaging can; and wherein the cover is formed centrally thereof with a hole, form which a cylindrical portion is extend outside, and a projection formed centrally of the collecting plate is inserted into the cylindrical portion to an extent not to project from the cylindrical portion, and wherein the cylindrical portion and the projection are welded and sealed at a weld on an inner peripheral surface of the cylindrical portion.