Aluminum electrolytic capacitor
AssigneeNichicon Corporation
InventorsTakaaki Maruyama, Yoshishige Ikeda, Noburo Kuroki
Life of this patent
Estimating the term…
Abstract
An aluminum electrolytic capacitor includes an anode sheet of aluminum, a cathode sheet of aluminum, and separators disposed to sandwich either the anode sheet or the cathode sheet. Anode lead tabs of aluminum are connected to the anode sheet by “needling” or welding. Cathode lead tabs formed of an aluminum sheet are connected to the cathode sheet by “needling” or welding. The surface of each of the cathode lead tabs contacting the separator is roughened. Alternatively, an aluminum thin sheet may be disposed to overlie each of smooth-surfaced cathode lead tabs, with its surface contacting the separator roughened.
Claims7
An aluminum, electrolytic capacitor comprising:
- an anode sheet of aluminum having opposing major surfaces which have been roughened and have an oxide film formed thereon by anodic oxidation;
- a first separator impregnated with an electrolytic solution;
- a cathode sheet of aluminum having opposing major surfaces which have been roughened and have an oxide film spontaneously or electrochemically formed thereon;
- and
- a second separator impregnated with said electrolytic solution;
- said anode sheet, said first separator, said cathode sheet and said second separator being arranged into a stack with either said cathode sheet being disposed between said first and second separators, or said anode sheet being disposed between said first and second separators, said stack being rolled;
- an anode terminal section being disposed on a portion of one of said rougnened major surfaces of said anode sheet;
- a cathode terminal section being disposed on a portion of one of said roughened major surfaces of said cathode sheet, at least that one of opposing major surfaces of said cathode terminal section which is in contact with said first or second separator being roughened.
Dependencies are inferred from the claim text.