Solid Electrolytic Capacitor Insulating Layer Formation
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Solution Overview
Problem
Conventional solid electrolytic capacitors face issues with upward spreading of manganese nitrate aqueous solution during manufacturing, leading to leak currents due to gaps between the washer and anode wire, which are difficult to prevent effectively.
Innovation Solution
A method involving the formation of an insulating layer made of fluorine resin around the anode wire, using granular particles that are melted to create a close contact with the wire and prevent solution spreading, eliminating the need for a washer and reducing capillary action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a washer is fitted around the anode wire to prevent upward spreading of manganese nitrate aqueous solution, then leak current is reduced, but small gaps between the washer and anode wire still allow capillary action to induce solution spreading
Solution Approach 1:
The patent removes the washer component entirely and replaces it with an insulating layer formed directly on the anode wire through melting granular fluorine resin particles. This extraction eliminates the gap problem inherent in washer-based solutions while maintaining the function of preventing solution spreading through direct contact between the insulating layer and anode wire surface.
Solution Approach 2:
The patent changes the physical state of the fluorine resin from granular particles to melted liquid form, allowing it to flow and conform to the anode wire surface. This parameter change (from solid granules to molten state) enables complete coverage and elimination of gaps, preventing capillary action while maintaining electrical insulation.
2Ease of manufacture
If conventional washer structure is used to prevent solution spreading, then manufacturing is simplified, but the washer cannot completely eliminate gaps around the anode wire
Solution Approach 1:
The patent utilizes the phase transition of fluorine resin from solid granular state to liquid molten state during heating. This phase transition allows the resin to flow and completely fill the space around the anode wire, creating a gapless insulating layer that eliminates capillary action pathways while maintaining manufacturing simplicity.
Solution Approach 2:
The patent replaces the mechanical washer-fitting system with a thermal processing system where granular fluorine resin particles are heated to melt and form an insulating layer. This substitution transitions from mechanical assembly (fitting washers) to thermal processing (melting resin), achieving both ease of manufacture and precision gap elimination.
3Reliability
If granular fluorine resin particles are melted to form an insulating layer around the anode wire, then upward spreading of solution is suppressed and leak currents are prevented, but additional manufacturing steps are required
Solution Approach 1:
The patent combines multiple functions into the single insulating layer formed by melted fluorine resin: electrical insulation, mechanical barrier against solution spreading, and capillary action prevention. This merging eliminates the need for separate washer components and their associated assembly steps, reducing overall device complexity while maintaining reliability.
4Manufacturing precision
If insulating layer is formed by melting granular fluorine resin particles, then close contact with anode wire is achieved, but heating process is required
Solution Approach 1:
The patent changes the temperature parameter to melt the fluorine resin particles, transforming them from solid granules to liquid state. This temperature parameter change enables the resin to flow and achieve complete conformal contact with the anode wire surface, ensuring gapless coverage for precise insulation and capillary action prevention.
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 upward spreading of the solution, preventing leak currents and allowing for the production of solid electrolytic capacitors with improved reliability and increased capacitance while reducing size.
Implementation Method 1
The process of forming the insulating layer includes melting a resin material made of a fluorine resin
Implementation Method 2
Such a gap may induce the manganese nitrate aqueous solution to spread up owing to capillary action
Data Source
AI summary
Provided is a method of manufacturing a solid electrolytic capacitor that suppresses spreading up of a solution. The method includes forming a porous sintered body made of a valve metal and having an anode wire sticking out therefrom; forming an insulating layer made of a fluorine resin, so as to surround the anode wire; and forming a dielectric layer on the porous sintered body; forming a solid electrolyte layer on the dielectric layer, after forming the insulating layer. The process of forming the insulating layer includes melting granular particles made of a fluorine resin.