Electrolytic Capacitor Fixing Member for Terminal Displacement
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Solution Overview
Problem
Conventional electrolytic capacitors experience terminal displacement due to thermal and mechanical stress during manufacturing, leading to increased leakage current, especially when the number of terminals exceeds three, which complicates sealing and can result in defective products.
Innovation Solution
Incorporating a fixing member made of insulating materials like rubber, resin, or glass between the winding structure and the sealing member, with openings equal to or greater than the sum of anode and cathode terminals, to securely fix the terminals and mitigate stress-related issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wound-type capacitor element is subjected to heat treatment and mechanical stress during manufacturing, then the solid electrolyte can be formed and the capacitor can be sealed, but terminal displacement occurs leading to increased leakage current
Solution Approach 1:
The fixing member is installed on the capacitor element before sealing, performing preliminary action to prevent terminal displacement before the harmful effects of heat treatment and mechanical stress occur during the sealing process
Solution Approach 2:
The fixing member acts as an intermediary component between the capacitor element and the sealing member, mediating the interaction by providing mechanical support and preventing direct transmission of stress that would cause terminal displacement
2Adaptability or versatility
If the number of anode terminals and cathode terminals is three or more, then the capacitor can have multiple connections, but sealing becomes difficult and terminal displacement increases
Solution Approach 1:
The fixing member provides individual fixing positions for each terminal, segmenting the support function to handle multiple terminals independently, which facilitates the sealing process even when three or more terminals are present
3Reliability
If sealing member is forcibly placed after capacitor element is accommodated in bottomed case, then sealing can be achieved, but terminal displacement occurs and stress is applied to foils
Solution Approach 1:
The fixing member is installed before sealing to preliminarily secure the terminals and capacitor element, preventing displacement and reducing the force needed during sealing, thereby protecting foil integrity
Solution Approach 2:
The fixing member provides beforehand cushioning by absorbing and distributing mechanical stress during the sealing process, preventing direct transmission of harmful forces to the capacitor foils
Data Source
AI summary
An electrolytic capacitor in which positions of an anode terminal and a cathode terminal in a wound-type capacitor element can be fixed and consequently increase in leakage current can be suppressed and a manufacturing method thereof are provided. The electrolytic capacitor including a wound-type capacitor element having an anode terminal and a cathode terminal, a bottomed case accommodating the wound-type capacitor element, and a sealing member sealing the winding structure portion in the bottomed case, through which the anode terminal and the cathode terminal penetrate, includes a fixing member arranged between the winding structure portion and the sealing member and having openings in number not smaller than the sum of the number of anode terminals and the number of cathode terminals, the anode terminal and the cathode terminal passing through the openings, and the anode terminal and the cathode terminal being fixed by the fixing member.