Lead wire configuration for a solid electrolytic capacitor
AssigneeAVX Corporation
InventorsLadislav Vilc, Ivan Horacek
Life of this patent
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Abstract
A solid electrolytic capacitor that comprises a capacitor element, a lead wire, an anode termination, and a cathode termination is provided. The capacitor element contains a sintered porous anode body, a dielectric that overlies the anode body, and a solid electrolyte that overlies the dielectric. Further, the lead wire is in electrical contact with the anode body and contains a first region that is located in proximity to a surface of the capacitor element. The lead wire contains a core that extends outwardly from the surface, and an oxide layer coats at least a portion of the core within the first region.
Claims21
A solid electrolytic capacitor comprising:
- a capacitor element that contains a sintered porous anode body, a dielectric that overlies the anode body, and a solid electrolyte that overlies the dielectric;
- a lead wire that is in electrical contact with the anode body and contains a first region that is located in proximity to a surface of the capacitor element, wherein the lead wire contains a core that extends outwardly from the surface, and further wherein an oxide layer coats at least a portion of the core within the first region, wherein the oxide layer is discontinuous and defines one or more gaps;
- an anode termination that is in electrical connection with the lead wire;
- and
- a cathode termination that is in electrical connection with the solid electrolyte.
A method for forming a capacitor, the method comprising:
- anodically oxidizing a porous anode body to form a dielectric layer thereon, wherein a lead wire is embedded within the porous anode body that contains a core that extends outwardly from the anode body;
- applying a solid electrolyte over the dielectric layer, wherein the core of the lead wire is also coated with the solid electrolyte;
- removing the solid electrolyte from at least a portion of the core to form an exposed region;
- and
- anodically oxidizing the core so that an oxide layer is formed on the core at the exposed region, wherein the oxide layer is discontinuous and defines one or more gaps.
Dependencies are inferred from the claim text.