Patent ID: 8085525

Claim:
An electric double layer capacitor comprising: a case; an electrolyte solution accommodated in the case, the electrolyte solution containing lithium ions; a first electrode foil immersed in the electrolyte solution, the first electrode foil including a first collector and a first electrode layer provided on the first collector, the first collector being made of copper or nickel and functioning as a negative electrode; and a second electrode foil immersed in the electrolyte solution, the second electrode foil including a second collector and a second electrode layer provided on the second collector, the second collector being made of aluminum and functioning as a positive electrode, wherein: each of the first collector and the second collector has a first surface and a second surface opposite to the first surface, the first electrode layer and the second electrode layer are made from liquid material applied onto the first collector and the second collector, respectively, each of the first collector and the second collector has a plurality of apertures provided therein, the plurality of apertures communicating with the first surface and the second surface, at least one of the first collector and the second collector has overlapping portions at edges of the plurality of apertures, and at the overlapping portions, a part of said at least one of the first collector and the second collector is bent to overlap and contact said at least one of the first collector and the second collector.