Solid electrolytic capacitor and method for manufacturing solid electrolytic capacitor

By forming the first base electrode and the second base electrode on the first end surface of the solid electrolytic capacitor, and welding a plurality of capacitor elements, the problem of decreasing the volume ratio of the functional part and unreliable connection caused by welding margin is solved, and a higher volume ratio and reliability of the functional part is achieved.

CN119744429APending Publication Date: 2025-04-01MURATA MFG CO LTD
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Patent Information

Application Number
CN202380061120.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2022-08-31
Filing Date
2023-08-24
Publication Date
2025-04-01

AI Technical Summary

Technical Problem

In the existing solid electrolytic capacitors, the volume ratio of the functional part decreases due to the presence of welding margin, and in the process of reducing welding margin, unreliable connection between the capacitor components and the lead frame may affect contactability.

Method used

By forming the first base electrode and the second base electrode on the first end surface and welding a plurality of capacitor elements to form the capacitor laminate, the formation of the welding margin is avoided, thereby increasing the formation area of ​​the dielectric layer and the solid electrolyte layer, increasing the volume ratio of the functional part, and ensuring reliable connection between the capacitor element and the lead frame.

Benefits of technology

It is realized that the volume ratio of the functional part is increased without increasing the size of the solid electrolytic capacitor, and the reliability of the solid electrolytic capacitor is improved.

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Abstract

This solid electrolytic capacitor is provided with a capacitor element, a sealing body, a first base electrode, and a second base electrode. The capacitor element includes a flat film-like body including a valve metal, a dielectric layer formed on the cathode formation region, and a solid electrolyte layer formed on the dielectric layer. Further, the capacitor element has an anode terminal region in which the solid electrolyte layer is not formed with respect to the main body, and a cathode formation region including the solid electrolyte layer. The sealing body has a plurality of stacked capacitor elements, is sealed by an insulating resin, and has a first end surface that exposes an end portion of the anode terminal region in a linear shape. The first base electrode is disposed on the first end surface and includes a first element. The second base electrode covers the first base electrode and includes a first element and a second element. The second base electrode is an intermetallic compound of the first element and the second element.
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