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An electric double-layer capacitor has an elongate separator impregnated with an electrolytic solution and folded alternately in different directions into folded layers of a predetermined length, and a plurality of stacked electrode plates each disposed between adjacent two of the folded layers of t

An electric double-layer capacitor has an elongate separator impregnated with an electrolytic solution and folded alternately in different directions into folded layers of a predetermined length, and a plurality of stacked electrode plates each disposed between adjacent two of the folded layers of the separator. The electrode plates have opposite polarities confronting each other through the folded layers of the separator. A plurality of flexible collectors are connected to respective ends of the electrode plates and extend from between the folded layers of the separator. The flexible collectors of each of the polarities are bundled in a direction parallel to the electrode plates on one side of the electrode plates and disposed at an outermost layer of the electrode plates with respect to a direction in which the electrode plates are stacked.

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[ What is claimed is:] [2.] A capacitor device comprising:a plurality of electric double-layer capacitors each comprising:an elongate separator impregnated with an electrolytic solution and folded alternately in different directions into folded layers of a predetermined length;a plurality of stacked

[ What is claimed is:] [2.] A capacitor device comprising:a plurality of electric double-layer capacitors each comprising:an elongate separator impregnated with an electrolytic solution and folded alternately in different directions into folded layers of a predetermined length;a plurality of stacked electrode plates each disposed between adjacent two of the folded layers of said separator, the electrode plates having opposite polarities confronting each other through the folded layers of said separator; anda plurality of flexible collectors connected to respective ends of said electrode plates and extending from between the folded layers of said separator, said flexible collectors of each of the polarities being bundled in a direction parallel to said electrode plates on one side of said electrode plates and disposed at an outermost layer of the electrode plates with respect to a direction in which the electrode plates are stacked;said electric double-layer capacitors being stacked in the direction in which said electrode plates are stacked, the bundled flexible collectors of one polarity of one of said electric double-layer capacitors being connected to the bundled flexible collectors of a different polarity of an adjacent one of said electric double-layer capacitors.