Electric double-layer capacitor

An electric double-layer capacitor including at least one basic cell and a pair of external terminals electrically connected to said at least one basic cell;

• each of said at least one basic cell being formed by a half of a first unit cell and a half of a second unit cell;
• each of said first and second unit cells comprising:
• (a) a tubular gasket having a tubular inner space and open ends;
• said gasket being made of an insulative material;
• (b) a sheet-like collector fixed to said gasket in said inner space of said gasket such that said inner space is divided into two parts;
• said collector being made of a conductive material;
• said collector having first and second surfaces located at opposite sides;
• (c) a pair of polarizable electrodes onto which an electrolyte solution is absorbed;
• said pair of electrodes being located in said two parts of said inner space;
• each of said pair of electrodes having an inner surface, an outer surface, and two end surfaces:
• said inner surface of each of said pair of electrodes contacting said first and second surfaces of said collector, respectively;
• said pair of electrodes being made of a solid activated-carbon;
• and
• (d) a sheet-like separator made of a porous, non-electron-conductive material;
• wherein said gasket is made of a thermoplastic resin and is formed by injection molding;
• and wherein said collector and said pair of electrodes are unified with said gasket;
• and wherein the unification of said collector and said pair of electrodes with said gasket is performed during the molding process of said gasket;
• and wherein said first and second unit cells are stacked to be connected in cascade to each other through said separator;
• and wherein said separator has first and second surfaces at opposite sides which contact opposing outer surfaces of one of said pair of electrodes in each of said first and second unit cells such that said separator is sandwiched between same.