Patent ID: 6843810

Claim:
A method for preparing en electric double layer capacitor, said method comprising steps of: (A) applying a current collector having a plate-like form onto a surface of a substrate in such a manner that an uncovered portion of the substrate is formed around the current collector; (B) disposing a gasket element in the form of a frame having an opening for accommodating the current collector on the uncovered portion of the substrate in such a manner that the current collector laterally abuts on the gasket element to define a concavity; (C) placing a polarizable electrode impregnated with an electrolytic solution in the concavity defined by the current collector and the gasket element; (D) oppositely disposing two intermediate products prepared through the steps (A) to (C) on a separator having a substantially planar form in such a manner that the gasket elements abut on surfaces of a peripheral portion of the separator; (E) fusion-bonding the gasket elements together to laterally cover the separator with the resulting unified gasket to unite the two intermediate products and the separator; and (F) removing the substrates from the current collectors and the gasket.