Electrolytic Capacitor Sealing Coating for High-Temperature Leakage Control
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Solution Overview
Problem
Capacitors used in high-temperature environments face rapid deterioration of the sealing member, leading to leakage of electrolytic solutions or functional liquids, which results in unstable capacitor characteristics over time.
Innovation Solution
A capacitor design that includes a sealing member deterioration preventing agent dissolved in a lipophilic solvent, which permeates the sealing member and forms a coating that suppresses oxidation and deterioration, maintaining the integrity of the sealing member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an anti-aging agent is mixed in the sealing member to suppress oxidation reactions, then the sealing member's resistance to deterioration is improved, but the anti-aging agent is gradually depleted and the sealing member deteriorates rapidly in high-temperature environments
Solution Approach 1:
The patent introduces a sealing member deterioration preventing agent as an intermediary substance that mediates between the electrolytic solution and the sealing member. This agent is supplied from the electrolytic solution through the separator to the sealing member, where it prevents deterioration without being rapidly depleted like conventional anti-aging agents mixed into the sealing member material itself.
Solution Approach 2:
The system enables self-service by allowing the electrolytic solution to continuously supply the sealing member deterioration preventing agent to the sealing member through the separator. This creates a self-replenishing mechanism where the sealing member receives ongoing protection without requiring the anti-aging agent to be permanently embedded in the sealing member material.
2Productivity
If the capacitor is used in high-temperature environments to meet performance requirements, then the capacitor's operational capability is improved, but the sealing member deteriorates rapidly causing leakage
Solution Approach 1:
The patent applies preliminary anti-action by introducing the sealing member deterioration preventing agent before deterioration occurs. The agent is supplied from the electrolytic solution to the sealing member in advance, forming a protective effect that prevents oxidation and deterioration before they can occur, even in high-temperature environments.
Solution Approach 2:
The patent changes the chemical parameters of the electrolytic solution by adding the sealing member deterioration preventing agent. This chemical modification allows the electrolytic solution to actively supply protective substances to the sealing member, fundamentally changing the interaction between the electrolytic solution and sealing member from purely passive to actively protective.
3Reliability
If a functional liquid is used to repair oxide film defects, then the capacitor element's performance is improved, but the functional liquid leaks out when the sealing member deteriorates
Solution Approach 1:
The patent applies universality by making the electrolytic solution multi-functional. It not only serves as the electrolytic medium for capacitor operation but also functions as a delivery system for the sealing member deterioration preventing agent. This dual functionality allows the system to simultaneously maintain capacitor performance and prevent sealing member deterioration without requiring separate functional liquids.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents the leakage of solutions and maintains the capacitor's characteristics stably for a long period, even in high-temperature environments.
Implementation Method 1
The solution is supplied through the separator to the sealing member and permeates the sealing member
Implementation Method 2
a sealing member deterioration preventing agent that solidifies by oxidation
Implementation Method 3
a sealing member deterioration preventing agent that solidifies by oxidation
Implementation Method 4
a coating resulting from the sealing member deterioration preventing agent solidifying coats the outer face of the sealing member
Data Source
AI summary
A capacitor 1 includes a capacitor element 3 holding solution between an anode foil 5 and a cathode foil 7 that are wound up with a separator 6 in between, a body case 2 for housing the capacitor element 3, and a sealing member 4 for sealing the body case 2. A part of the separator 6 makes contact, at a plurality of points or over an area, with the face of the sealing member 4 facing the capacitor element 3 so as to rest on that face. The solution contains, dissolved in a lipophilic solvent, deterioration preventing agent that solidifies by oxidation. The solution is supplied through the separator 6 to the sealing member 4 and permeates the sealing member 4, so that a coating 17 resulting from the agent solidifying coats the outer face of the sealing member 4, leaving the solution present in the sealing member 4.