Patent ID: 7881043

Claim:
A wound electric double-layer capacitor comprising: a capacitor element formed by winding a positive electrode and a negative electrode while a separator is interposed between the positive electrode and negative electrode, the positive electrode having polarized electrode layers on both surfaces of a current collector made of a metal foil and being coupled to a lead wire, the negative electrode having polarized electrode layers on both surfaces of a current collector made of a metal foil and being coupled to a lead wire; a closed-end cylindrical metal case for storing the capacitor element together with an electrolyte for driving; and a sealing member for sealing an opening of the metal case, wherein the polarized electrode layers formed in the negative electrode are wound at least one extra turn from the winding end of the polarized electrode layers that are formed in the positive electrode constituting the capacitor element, and hence a part where the polarized electrode layers formed in the negative electrode face each other through the separator is formed on an outermost peripheral surface of the capacitor element.