Wound electric double-layer capacitor

A wound electric double-layer capacitor comprising:

• a capacitor element formed by winding a positive electrode and a negative electrode while a separator is interposed between the positive electrode and negative electrode,
• wherein the positive electrode has polarized electrode layers on both surfaces of a current collector made of a metal foil, and a lead wire is coupled to an exposed part of the current collector that is disposed in a part of the polarized electrode layers, and
• wherein the negative electrode has polarized electrode layers on both surfaces of a current collector made of a metal foil, and a lead wire is coupled to an exposed part of the current collector that is disposed in a part of the polarized electrode layers;
• a closed-end cylindrical metal case for storing the capacitor element together with an electrolyte for driving;
• and
• a sealing member for sealing an opening of the metal case,
• wherein the exposed part of the current collector is disposed in one of the positive electrode and the negative electrode that constitute the capacitor element, the one electrode facing, through the separator, a coupling part of the lead wire coupled to at least the other.

A wound electric double-layer capacitor comprising:

• a metal case for storing a capacitor element together with an electrolyte for driving;
• and
• a terminal plate for sealing an opening of the metal case,
• wherein the capacitor element is formed by stacking a band-like anode foil and a band-like cathode foil through a band-like separator, and winding the anode foil and cathode foil while the cathode foil is disposed inside,
• wherein the anode foil has a first drawing electrode on one longitudinal side of the anode foil, and the cathode foil has a second drawing electrode on the other longitudinal side of the cathode foil, and
• wherein the cathode foil is wound at least one extra turn from the winding end of the anode foil.

A wound electric double-layer capacitor comprising:

• a metal case for storing a capacitor element together with an electrolyte for driving;
• and
• a terminal plate for sealing an opening of the metal case,
• wherein the capacitor element is formed by stacking a band-like anode foil and a band-like cathode foil through a band-like separator, and winding the anode foil and cathode foil while the anode foil is disposed inside,
• wherein the anode foil has a first drawing electrode on one longitudinal side of the anode foil, and the cathode foil has a second drawing electrode on the other longitudinal side of the cathode foil, and
• wherein the cathode foil is wound at least beyond the winding end of the anode foil.