Electrolytic Capacitor Insulated Metal Case Short-Circuit Prevention
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Solution Overview
Problem
Existing electrolytic capacitors with metal cases are prone to short-circuiting between the metal case and the lead terminal due to electrical conductivity, which can lead to malfunction and failure.
Innovation Solution
The use of an electrolytic capacitor design where the packaging member's side wall is either electrically conductive or non-conductive, with an insulating member interposed between the side wall and the lead terminal to prevent contact, ensuring that the lead terminal is partially exposed and not flush with the packaging member's end, thereby preventing short-circuiting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal case is used as the packaging member, then the packaging member provides mechanical strength and protection, but short-circuiting may occur between the metal case and the lead terminal
Solution Approach 1:
An insulating member is introduced as an intermediary between the conductive metal case and the lead terminal. This insulating member prevents direct electrical contact while allowing the metal case to maintain its mechanical strength and protective function. The insulating member acts as a mediator that resolves the contradiction by providing electrical isolation without compromising structural integrity.
Solution Approach 2:
The packaging member is segmented into distinct functional zones: the metal case provides mechanical strength, while the insulating member provides electrical isolation. By dividing the packaging structure into separate components with different functions, the design achieves both mechanical strength and short-circuit prevention simultaneously.
2Reliability
If the lead terminal is fully covered by the packaging member, then the packaging member provides complete protection, but the lead terminal cannot be accessed for connection
Solution Approach 1:
The packaging member exhibits local quality by being partially transparent or having a transparent window at specific locations where lead terminals need to be accessed. This allows the packaging to provide complete protection in most areas while maintaining accessibility in specific local regions, resolving the contradiction between protection and ease of operation.
Data Source
AI summary
Provided is an electrolytic capacitor including: a capacitor element including an anode body, a dielectric layer formed on the anode body, a solid electrolyte layer formed on the dielectric layer, and a cathode layer formed on the solid electrolyte layer; lead terminals each connected to the anode body and the cathode layer; and a packaging member covering at least part of the capacitor element. The packaging member includes a side wall that is electrically conductive, and a bottom face, with at least one of the lead terminals partially exposed from the bottom face. An insulating member is interposed between a first end of the side wall and the lead terminal exposed from the bottom face, the first end being near the bottom face.