Patent ID: 8045320

Claim:
A capacitor comprising: a wound element including: a first electrode unit having a first collector and a first polarization electrode on both sides of the first collector; a second electrode unit having a second collector and a second polarization electrode on both sides of the second collector; and a first separator and a second separator between the first electrode unit and the second electrode unit, a cylindrical housing with a bottom plate; a lid of the housing, which lid has a hole therein; a winding shaft; a first annular insulating member; a second annular insulating member; a stopper to cover the hole; and an electrolyte within the housing, wherein the first electrode unit in the wound element is in contact with the lid at a first end face of the first collector, thereby comprising a first pole, and the second electrode unit in the wound element is in contact with the cylindrical housing at a second end face of the second collector, thereby comprising a second pole, wherein the first collector has a border section between an inner most circumference and an outer most circumference of the wound element, and includes a first region between the inner most circumference and the border section, and a second region between the border section and the outer most circumference, wherein the second collector also has a border section between the inner most circumference and the outer most circumference of the wound element, and includes a first region between the inner most circumference and the border section, and a second region between the border section and the outer most circumference, wherein parts of each of the first and the second collectors, in which there is no first or second polarization electrode, in the first regions at the first and the second end faces, are bent toward the outer circumference of the wound element, and wherein parts of each of the first and the second collectors, in which there is no first or second polarization electrode, in the second regions at the first and the second end faces, are bent toward a core of the wound element.