Capacitor Sealing Structure for High-Temperature Electrolyte Retention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Capacitors deteriorate rapidly in high-temperature environments due to degradation of sealing members, leading to loss of electrolytic or functional liquids and instability in capacitor characteristics over time.
Innovation Solution
A capacitor design featuring a liquid supply sheet with an absorption portion contacting the separator and a supply portion contacting the sealing member, using a lipophilic solvent with a sealing member deterioration preventing agent to prevent oxidation and maintain the sealing member's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an antioxidant (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 antioxidant is gradually depleted over time, especially in high-temperature environments, leading to rapid deterioration once depleted
Solution Approach 1:
The patent applies preliminary action by providing a liquid supply sheet that proactively supplies antioxidant solution to the sealing member before oxidation deterioration occurs. The absorption portion of the liquid supply sheet is pre-positioned to contact the separator, and the supply portion contacts the sealing member, creating an advance supply mechanism that prevents depletion of antioxidant effectiveness.
Solution Approach 2:
The patent uses an intermediary approach by introducing a liquid supply sheet as a mediator between the separator (which contains the electrolytic solution) and the sealing member. This intermediary component absorbs the electrolytic solution containing the sealing member deterioration preventing agent and transports it to the sealing member, enabling continuous replenishment without direct contact between the electrolytic solution and sealing member.
2Adaptability or versatility
If the capacitor is used in high-temperature environments to meet compact device requirements, then device integration is improved, but the sealing member deteriorates rapidly due to heat acceleration of oxidation, causing electrolytic solution evaporation and capacitor failure
Solution Approach 1:
The liquid supply sheet performs preliminary action by continuously supplying the sealing member deterioration preventing agent to the sealing member before high-temperature oxidation can cause significant deterioration. This proactive supply mechanism ensures the sealing member maintains its protective properties even in high-temperature environments where oxidation rates are accelerated.
Solution Approach 2:
The patent implements continuity of useful action through the liquid supply sheet that continuously supplies the sealing member deterioration preventing agent to the sealing member. This continuous replenishment ensures uninterrupted protection against oxidation, maintaining capacitor reliability in high-temperature operating conditions over extended periods.
3Reliability
If a hydrophilic polymer compound is used as solid electrolyte to repair oxide film defects, then capacitor characteristic stability is improved, but water held in the polymer leaks out when the sealing member deteriorates, making oxide film repair impossible
Solution Approach 1:
The liquid supply sheet serves as an intermediary that supplies the sealing member deterioration preventing agent to prevent sealing member deterioration. By preventing sealing member failure, this intermediary mechanism indirectly protects the water in the hydrophilic polymer from leaking out, thereby preserving the oxide film repair capability of the solid electrolyte.
Solution Approach 2:
The patent applies beforehand cushioning by providing a protective mechanism (liquid supply sheet with deterioration preventing agent) that cushions against the potential harm of sealing member deterioration. This prior protection prevents the chain reaction that would lead to water loss from the hydrophilic polymer and loss of oxide film repair capability.
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 liquid leakage and maintaining capacitor stability and performance for an extended period in high-temperature conditions.
Implementation Method 1
an absorption portion that makes contact with the separator to absorb the solution
Implementation Method 2
a supply portion that makes contact with the sealing member to supply it with the solution
Data Source
AI summary
A capacitor includes a capacitor element that holds a predetermined solution between an anode foil and a cathode foil wound up with a separator in between, a body case that is formed in the shape of a bottomed tube closed at one end with a wall and open at the other end to have an opening, a liquid supply sheet that is arranged between the inner face of the case and the outer face of the element, and a sealing member that seals the opening. The solution has a sealing member deterioration preventing agent dissolved in a lipophilic solvent. The sheet has an absorption portion that makes contact with the separator to absorb the solution and a supply portion that makes contact with the sealing member to supply it with the solution.