Capacitor Sealing Member Coating for High-Temperature Leakage Control
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Solution Overview
Problem
Capacitors used in high-temperature environments face rapid deterioration of sealing members due to depletion of anti-aging agents, leading to electrolyte evaporation or functional liquid leakage, 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, permeates the sealing member through a separator, forming a coating that suppresses oxidation and maintains the sealing member's integrity, preventing electrolyte or functional liquid leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a sealing member made of polymer rubber is used to seal the body case, then the capacitor can be manufactured with standard sealing components, but the sealing member deteriorates rapidly in high-temperature environments due to oxidation, causing electrolyte evaporation and capacitor failure
Solution Approach 1:
The patent changes the chemical composition parameters of the sealing member by incorporating specific antioxidants (vitamin E, vitamin C, or their derivatives) at controlled concentrations (0.1-10 wt%) into the polymer matrix. This chemical parameter modification enables the sealing member to resist oxidation at high temperatures while maintaining its original manufacturing processes and physical sealing properties.
Solution Approach 2:
The patent creates a composite sealing member material by combining polymer rubber with antioxidant compounds. This composite structure integrates the sealing functionality of the polymer with the oxidation-resistant properties of the antioxidants, resulting in a material that maintains both ease of manufacture and high-temperature reliability.
2Object-affected harmful factors
If anti-aging agents are mixed in the sealing member to suppress oxidation reactions, then the sealing member's resistance to oxidation is improved, but the anti-aging agents are gradually depleted over time, leading to rapid deterioration once depleted
Solution Approach 1:
The patent implements a self-replenishing system where the capacitor element continuously supplies anti-aging agents through the separator to the sealing member. The separator acts as a transport medium, allowing the anti-aging agents to migrate from the capacitor element to the sealing member over time, automatically replenishing depleted antioxidants without external intervention.
Solution Approach 2:
The patent establishes a continuous supply mechanism where anti-aging agents are constantly transported from the capacitor element through the separator to the sealing member. This continuous action ensures that the sealing member never fully depletes its antioxidant reserves, maintaining prolonged oxidation resistance throughout the capacitor's operational life.
3Reliability
If the separator is designed to contact the sealing member face to enable solution permeation, then the sealing member can be continuously supplied with anti-aging agents, but the separator structure becomes more complex requiring precise positioning
Solution Approach 1:
The patent makes the separator multi-functional by assigning it both its traditional role of electrically isolating the anode and cathode foils and the additional function of serving as a transport pathway for anti-aging agents. This eliminates the need for separate positioning structures, as the separator's inherent presence between the foils automatically enables the anti-aging agent supply function.
Solution Approach 2:
The patent merges the anti-aging agent transport function with the existing separator structure. Instead of adding a separate mechanism for agent delivery, the design combines this function with the separator that already exists in the capacitor element, simplifying the overall structure while ensuring reliable agent supply to the sealing member.
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 stabilizes the capacitor's performance by preventing sealing member deterioration, ensuring the electrolyte or functional liquid remains within, thereby maintaining capacitance and preventing leakage, even in high-temperature environments 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
Implementation Method 3
the sealing member deterioration preventing agent 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.