Solid Electrolytic Capacitor Insulation via Porous Layer Reduction
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Solution Overview
Problem
Conventional methods for ensuring insulation between the anode and cathode parts in solid electrolytic capacitors are inadequate, leading to insulation failures and increased leakage current due to the 'crawling-up' of solid electrolyte during the production process.
Innovation Solution
A substrate for solid electrolytic capacitors with a porous layer is developed, where at least part of the porous layer between the anode and cathode regions is reduced or compressed, and the resulting dent is filled with a masking material to prevent electrolyte intrusion, thereby ensuring electrical insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyimide film is formed through electrodeposition to insulate anode and cathode parts, then insulation reliability is improved, but manufacturing cost increases and high-temperature dehydration step is required
Solution Approach 1:
The invention extracts and removes the problematic porous layer at the boundary between anode and cathode regions, eliminating the pathway for solid electrolyte crawling-up. This simpler approach of removing the defect source replaces the complex polyimide film formation process through electrodeposition and high-temperature dehydration, achieving insulation reliability without the associated manufacturing complexity
Solution Approach 2:
The porous layer is removed in advance before solid electrolyte formation, preventing crawling-up from occurring in the first place. This preliminary action eliminates the need for subsequent complex insulation measures like polyimide film deposition, simplifying the overall manufacturing process while ensuring insulation reliability
2Reliability
If a tape or resin-coating film is used to prevent solid electrolyte crawling-up, then insulation is improved, but edge parts cannot be completely covered and insulation failure still occurs
Solution Approach 1:
Instead of attempting to cover the boundary region with tapes or coating films (which fail to completely cover edge parts), the invention extracts and removes the porous layer itself from the boundary region. This eliminates the crawling-up pathway at the edges where conventional coating methods fail, achieving complete coverage and insulation reliability
Solution Approach 2:
Conventional methods try to add protective layers over the porous layer to prevent crawling-up. The invention inverts this approach by removing the porous layer itself from the boundary region, turning the problem-solving strategy from addition to subtraction, thereby achieving complete edge coverage and insulation
3Reliability
If a masking material solution is coated to form a masking layer, then insulation is improved, but infiltration depth is insufficient when pore size distribution is unsuitable
Solution Approach 1:
The invention extracts and removes the porous layer from the boundary region between anode and cathode, eliminating the need for masking material infiltration entirely. This approach bypasses the problem of insufficient infiltration depth caused by unsuitable pore size distribution, achieving insulation reliability through direct removal of the crawling-up pathway
Solution Approach 2:
The porous layer is removed in advance before solid electrolyte formation, preventing crawling-up before it can occur. This preliminary removal eliminates the need for subsequent masking material coating and infiltration steps, ensuring insulation reliability without concerns about infiltration depth
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
This approach enhances the reliability of insulation between the cathode and anode parts, reduces leakage current, and improves production yield by preventing insulation failures and electrolyte crawling.
Implementation Method 1
at least part of the porous layer between the anode part region and the cathode part region is reduced
Implementation Method 2
filling the dent generated by the reduction with a masking material
Data Source
AI summary
The invention relates to a substrate for solid electrolytic capacitor and a method for producing solid electrolytic capacitors using the substrate. By reducing at least part of the porous layer on the surface between the anode part region and the cathode part region of the substrate and preferably filling the dent generated by the reduction with a masking material, a structure ensuring insulation between the anode and the cathode can be obtained and solid electrolytic capacitors excellent in leakage current property and reliability can be obtained.