Solid electrolytic capacitor and method of manufacturing the same
The solid electrolytic capacitor design with a surface-expanding layer and carbon layer on the cathode foil addresses ESR issues by minimizing thermal expansion mismatch, ensuring stable performance under high temperatures.
JP2025158934APending Publication Date: 2025-10-17NIPPON CHEMI CON CORP
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Patent Information
- Application Number
- JP2025056256
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-04-05
- Filing Date
- 2025-03-28
- Publication Date
- 2025-10-17
AI Technical Summary
Technical Problem
Solid electrolytic capacitors experience significant increases in equivalent series resistance (ESR) due to thermal degradation when exposed to high temperatures, leading to voltage fluctuations and reduced voltage smoothing ability.
Method used
A solid electrolytic capacitor design featuring a cathode body with a surface-expanding layer that accounts for 12% to 24% of its thickness, incorporating a carbon layer laminated on the cathode foil, and a conductive polymer layer to suppress ESR changes by minimizing thermal expansion mismatch.
Benefits of technology
The design effectively suppresses ESR increases at high temperatures, maintaining capacitor performance and preventing thermal degradation.
✦ Generated by Eureka AI based on patent content.
Abstract
To provide a solid electrolytic capacitor in which a change in a low equivalent series resistance (ESR) is suppressed even when it is exposed to a high temperature, and a method of manufacturing the same.SOLUTION: A solid electrolytic capacitor includes an anode body having a dielectric film, a cathode body facing the anode body, and a conductive polymer layer interposed between the anode body and the cathode body, and is manufactured by a manufacturing method including an anode forming step of forming the anode body having the dielectric film, a cathode forming step of forming the cathode body, and a solid electrolyte forming step of forming the conductive polymer layer between the anode body and the cathode body. The cathode forming step includes a surface expanding step of forming a surface expanding layer on a cathode foil using a valve action metal as a base material and a carbon laminating step of laminating a carbon layer on the surface expanding layer, and the cathode body includes a cathode foil using the valve action metal as the base material, a surface expanding layer formed on a surface of the cathode foil, and a carbon layer laminated on the surface expanding layer. In the cathode forming step, the surface expanding layer occupying 12% or more of the thickness of the cathode body is formed, and the surface expanding layer occupies 12% or more of the thickness of the cathode body.SELECTED DRAWING: None
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