Patent ID: 7286335

Claim:
An electric double layer capacitor comprising: an electrolytic solution; an element assembly comprising a positive electrode and a negative electrode which are electrodes each forming an electric double layer at the interface with the electrolytic solution, and a separator interposed between the positive electrode and the negative electrode; an outer casing for accommodating the element assembly; a sealing plate sealing the outer casing; and a terminal portion attached to a through hole perforating the sealing plate and conducting input and output of an electric energy between the element assembly accommodated in the outer casing and the outside; wherein the terminal portion is constituted by a terminal; fixing means; a first insulation member and a second insulation member which are each encompassing the outer face of the terminal; and a sealing member; the terminal is inserted into the through hole and electrically connected with one of the electrodes and has a flange portion formed at a portion below the sealing plate, and has a concave portion formed in a portion of the outer face of the terminal above the sealing plate; the first insulation member is provided between the flange portion and the sealing plate; the second insulation member is provided in the upper side of the sealing plate; the sealing member is provided in a spacing defined by the inner face of the through hole, the outer face of the terminal, the first insulation member and the second insulation member; and and the fixing means has one end engaged in the concave portion and another end pushing the second insulation member against the sealing plate.