Electrolytic capacitor, and method for manufacturing an electrolytic capacitor

Abstract

By improving the conductivity efficiency, the temperature rise at the crimped portion is suppressed, providing an electrolytic capacitor with excellent reliability, and a method for manufacturing an electrolytic capacitor. [Solution] The electrolytic capacitor according to the present invention comprises an anode foil, a cathode foil, a separator, and lead terminals connected to the anode foil and the cathode foil, respectively. The lead terminal consists of a terminal portion, a lead wire, and a connection portion. The terminal portion has at least two crimped connection portions, which are perforated in a state where it is superimposed on the anode foil or the cathode foil, bent toward the anode foil or the cathode foil, and press-connected. The diameter of the press-connected crimped bent portion of the first crimped connection portion on the lead wire side of the terminal portion is larger than the diameter of the bent portion of the second crimped connection portion. The ratio of the diameter of the bent portion of the first crimped connection portion to the crimping distance between the first crimped connection portion and the second crimped connection portion is 1:0.9 to 1:1.3.

Claims

1. In an electrolytic capacitor having an anode foil having an oxide film on its surface, a cathode foil, a separator inserted between the anode foil and the cathode foil, and lead terminals connected to the anode foil and the cathode foil respectively, The lead terminal comprises a flat terminal portion crimped to the anode foil or the cathode foil, a lead wire, and a connecting portion connecting the terminal portion and the lead wire. At least two crimped connection portions are formed in the terminal portion of the lead terminal, which is perforated while overlapping with the anode foil or the cathode foil, and a part of the terminal portion is bent toward the anode foil or the cathode foil, and pressed together. In the first crimped connection portion on the lead wire side of the terminal portion, the diameter of the first crimped bent portion, which is bent toward the anode foil or cathode foil side and pressed together, is larger than the diameter of the second crimped bent portion of the second crimped connection portion adjacent to the first crimped connection portion. An electrolytic capacitor characterized in that the ratio of the diameter of the first crimped bend of the first crimped connection to the crimping distance between the first crimped connection and the second crimped connection is 1:0.9 to 1:1.

3.

2. The electrolytic capacitor according to claim 1, characterized in that the ratio of the diameter of the first crimped bend of the first crimped connection to the diameter of the second crimped bend of the second crimped connection is 1:0.5 to 1:0.

9.

3. The electrolytic capacitor according to claim 1, characterized in that, when there are n crimped connections (where n is an integer of 3 or more), the diameter of the (n-1) bent portion of the (n-1) crimped connection is smaller than the diameter of the first bent portion of the first crimped connection and the diameter of the n bent portion of the n crimped connection, and the ratio of the diameter of the n bent portion of the n crimped connection to the crimping distance between the n crimped connection and the (n-1) crimped connection is 1:0.9 to 1:1.

3.

4. The electrolytic capacitor according to claim 3, characterized in that the ratio of the diameter of the nth bent portion of the nth crimped connection to the diameter of the (n-1) bent portion of the n-1 crimped connection is 1:0.5 to 1:0.

9.

5. A method for manufacturing an electrolytic capacitor comprising an anode foil having an oxide film on its surface, a cathode foil, a separator inserted between the anode foil and the cathode foil, and lead terminals connected to the anode foil and the cathode foil, respectively. The lead terminal comprises a flat portion crimped to the anode foil or the cathode foil, a lead wire, and a connecting portion connecting the flat portion and the lead wire. At least two crimped connection portions are formed in the flat portion of the lead terminal, which is perforated while overlapping with the anode foil or the cathode foil, and a portion of the flat portion is bent toward the anode foil or the cathode foil, and pressed together. A method for manufacturing an electrolytic capacitor, characterized by manufacturing a crimped connection portion by setting the ratio of the needle diameter of the crimping needle used to manufacture the first crimped connection portion on the lead wire side of the terminal portion to the needle diameter of the crimping needle used to manufacture the second crimped connection portion adjacent to the first crimped connection portion to 1:0.65 to 1:0.92.

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