Capacitor Sealing Member Replenishment for Heat-Driven Oxidation
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Solution Overview
Problem
Capacitors used in high-temperature environments face rapid deterioration of sealing members, leading to leakage of electrolytic solutions or functional liquids, which compromises their stability and performance over time.
Innovation Solution
A capacitor design where a sealing member deterioration preventing agent, dissolved in a lipophilic solvent, is supplied through a separator to coat the outer face of the sealing member, preventing oxidation and maintaining the capacitor's characteristics by forming a protective coating.
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 in high-temperature environments, leading to rapid deterioration and loss of sealing effectiveness
Solution Approach 1:
The sealing member is designed to self-replenish its anti-aging agent supply by absorbing the agent from the electrolytic solution through permeation. The separator maintains contact with the sealing member face to facilitate continuous supply. This self-service mechanism ensures the sealing member can maintain its antioxidant properties throughout its service life without external intervention.
Solution Approach 2:
The electrolytic solution is pre-loaded with a sealing member deterioration preventing agent that has not yet been consumed. This preliminary preparation ensures that when the sealing member's original anti-aging agent is depleted, fresh agent is already available to be absorbed and prevent oxidation, extending the service life before deterioration occurs.
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 due to heat acceleration of oxidation reactions
Solution Approach 1:
The chemical composition of the electrolytic solution is modified by adding a sealing member deterioration preventing agent. This parameter change transforms the electrolytic solution into a dual-function medium that provides both electrical functionality and antioxidant protection, counteracting the thermal oxidation damage accelerated by high-temperature operation.
Solution Approach 2:
The electrolytic solution acts as an intermediary carrier that transports the sealing member deterioration preventing agent to the sealing member through permeation. This intermediary mechanism allows the antioxidant agent to reach the sealing member indirectly, protecting it from thermal oxidation without requiring direct contact or additional delivery systems.
3Reliability
If the separator is made to contact the sealing member face to enable solution supply, then the delivery of deterioration preventing agent is improved, but the structural complexity of the capacitor assembly increases
Solution Approach 1:
The separator is designed to serve multiple functions: its primary function of electrical insulation between electrodes is maintained, and additionally it serves as a structural support that maintains contact with the sealing member face to enable agent delivery. This multi-functionality avoids adding separate components for agent delivery, thereby limiting the increase in structural complexity.
Solution Approach 2:
The agent delivery function is merged with the existing separator structure by positioning the separator to contact the sealing member face. This merging eliminates the need for separate delivery mechanisms and integrates the protective function into the existing capacitor assembly, minimizing additional complexity.
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 suppresses sealing member deterioration, preventing electrolytic solution or functional liquid leakage, thereby ensuring stable capacitor performance for an extended period.
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
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.