Electric double-layer capacitor and capacitor device

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;
• and
• a 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.

An electric double-layer capacitor comprising:

• a plurality of electrically interconnected double layer capacitor cells stacked upon one another, each cell disposed within a case of plastic resin;
• and
• at least one terminal at a surface of each case which provides a low resistance electrical pathway between the double layer capacitor cells;
• wherein each cell includes a) a plurality of electrode plates, with the electrode plates of opposite polarities being opposed to one another with a separator therebetween, and electrodes of the same polarity, electrically connected to one another in parallel and b) a plurality of flexible collectors, 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.