Electric double layer capacitor

Abstract

An electric double layer capacitor comprises a first electrode,comprising a belt-like electricity collecting material,having both surfaces on which electrode layers,are formed leaving belt-like portions in a side of the belt-like electricity collecting material,along its longitudinal direction, a second electrode,having the same structure as the first electrode,belt-like separators,to electrically insulate the first and second electrodes,a post-like winding core,on which the first and second electrodes,and the separators,are wound to thereby form a cylindrically wound element,a first electricity collecting plate,in contact with the belt-like portion,a second electricity collecting plate,in contact with the belt-like portion,wherein the belt-like portions,are located at opposing positions in the wound element,both ends of the winding core,are respectively in contact with the first and second electricity collecting plates,to determine the relative positions in axial directions of the first and second electricity collecting plates,and the electricity collecting plates,are electrically insulated. In the capacitor, tab-like electricity collecting leads are not required, manufacture is easy to shorten a time for manufacturing, and the capacity density per volume is high.