Patent ID: 7079376

Claim:
A method for manufacturing an electric double layer capacitor, comprising: a cell in which a pair of polarizable electrodes, which are impregnated with an electrolyte, are disposed in opposition on either side of a separator the polarizable electrodes being provided with collector electrodes and a peripheral portion of the cell being sealed by a sealing member composed of synthetic resin; and the sealing member being formed by abutting two case halves; the method comprising: a step of providing at least one long slit in the collector electrodes; a step of forming the case halves formed by insert molding on the collector electrodes and filling the slit, the case halves comprising a recess, one side of which extends in the lengthwise direction of the slit and, the cell being fitted into a portion inward from the slit; and a step of joining the case halves by abutting the case halves and applying ultrasonic vibration either in a perpendicular direction or a diagonal direction with respect to the lengthwise direction of the slit.