Solid electrolytic capacitor and method of manufacturing the same
AssigneesSanyo Electric Co., Ltd., Saga Sanyo Industries Co., Ltd.
InventorsKazumasa Fujimoto, Sachiko Yoshino
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Abstract
A solid electrolytic capacitor includes: a capacitor element comprising an anode made of a valve metal having an oxide film formed on a surface thereof, a cathode provided with a valve metal, and a separator provided between the anode and the cathode, the anode and the cathode and the separator being wound around together; a solid electrolyte interposed between the anode and the cathode; an anode lead tab having an oxide film formed on a surface thereof and being fixed to the anode; and a cathode lead tab fixed to the cathode. The oxide film of the anode lead tab has a portion the thickness of which is equal to or greater than 75% but less than 100% of the thickness of the oxide film of the anode.
Claims18
A solid electrolytic capacitor, comprising:
- a capacitor element comprising an anode made of a valve metal having an oxide film formed on a surface thereof, a cathode provided with a valve metal, and a separator provided between the anode and the cathode, the anode and the cathode and the separator being wound around together;
- a solid electrolyte interposed between the anode and the cathode;
- an anode lead tab having an oxide film formed on a surface thereof and being fixed to the anode;
- and
- a cathode lead tab fixed to the cathode;
- wherein the oxide film of the anode lead tab has a portion the thickness of which is equal to or greater than 75% but less than 100% of the thickness of the oxide film of the anode.
A method of manufacturing a solid electrolytic capacitor, comprising the steps of:
- performing a formation process to form an oxide film on a surface of a valve metal so as to prepare an anode and to form an oxide film on a surface of an anode lead tab;
- fixing an anode lead tab to the anode, and a cathode lead tab to a cathode provided with a valve metal, respectively;
- winding around the anode, the cathode, and a separator provided between the anode and the cathode to prepare a capacitor element;
- performing an cut edge formation of the capacitor element;
- and
- impregnating a solid electrolyte in the capacitor element,
- wherein, in the step of performing a formation process, the percentage of a formation voltage in preparing the anode lead tab with respect to a formation voltage in preparing the anode is controlled to be 75% or greater.
Dependencies are inferred from the claim text.