To provide a manufacturing method of an electric double layer capacitor to be used for an automobile etc. which can solve the problem that electrode connection of an element has unsatisfactory quality.
The manufacturing method has a step of fabricating a capacitor element 1 having positive/negative leading electrode sections 1a, 1b formed on both end surfaces; a step of housing the capacitor element 1 into a metallic case 2; a step of arranging a terminal plate 3 on an opening of the metallic case 2 housing the capacitor element 1 and sealing the metallic case 2; a step of joining the leading electrode sections 1a, 1b of the capacitor element 1 on the internal surface of the terminal plate 3 and the internal bottom surface of the metallic case 2; and a step of pouring a driving electrolytic solution into the metallic case 2. After fabricating the capacitor element 1, the electrodes constituting the leading electrode sections 1a, 1b formed on each of end surfaces of the capacitor element 1 are tilted so that they fall from the center to the external periphery along a winding direction, and thus, welding quality is improved and high reliability can be realized.
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HIBI NORITAKA
Hiroki Naito
Daisuke Nagano