Patent ID: 8054610

Claim:
A radial lead aluminum electrolytic capacitor, comprising: a wound unit ( 5 ) comprising: a cathode foil ( 3 ′), the cathode foil being a cathode formed foil; an anode foil ( 3 ); a first separator ( 4 ′); a second separator ( 4 ); a first lead wire ( 1 ′) stitched to the cathode foil ( 3 ′); and a second lead wire ( 1 ) stitched to the anode foil ( 3 ); the wound unit ( 5 ) being formed by winding a lamination in which the anode foil ( 3 ) and the cathode foil ( 3 ′) are alternately laminated with the first separator ( 4 ′) and the second separator ( 4 ) so that the second separator ( 4 ) is interposed between the anode foil ( 3 ) and the cathode foil ( 3 ′), while the cathode foil ( 3 ′) is interposed between the first separator ( 4 ′) and the second separator ( 4 ); a case ( 6 ) provided with an opening ( 8 ) and containing the wound unit ( 5 ) impregnated by electrolyte; a seal ( 7 ) for sealing up the opening ( 8 ) of the case ( 6 ); and a first gasket foil ( 2 ′) arranged at and covering a stitching place where the first lead wire ( 1 ′) is stitched to the cathode foil ( 3 ′), the first gasket foil ( 2 ′) being a gasket formed foil; wherein the cathode formed foil and the gasket formed foil of the first gasket foil ( 2 ′) have a forming voltage of 2-7V and a hydration withstanding time of above 12 hours; and a thickness of the gasket formed foil of the first gasket foil ( 2 ′) is equal to or greater than a thickness of the cathode formed foil.