Electrolytic Capacitor Separator Compression for Low ESR
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Solution Overview
Problem
High-density fiber structures in electrolytic capacitors hinder the penetration of conductive polymer particles, leading to increased equivalent series resistance (ESR) and difficulty in improving short-circuit resistance simultaneously.
Innovation Solution
A method of manufacturing a separator for electrolytic capacitors involves attaching a conductive polymer component to a low-density fiber sheet to form a composite sheet, which is then compressed to create a separator with improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-density fiber structure is used to improve short-circuit resistance, then short-circuit resistance is improved, but conductive polymer particles cannot penetrate into the fiber structure, resulting in increased ESR
Solution Approach 1:
The manufacturing process is divided into two distinct steps: first forming a low-density composite sheet where polymer particles can penetrate, then compressing it to achieve high density. This segmentation allows the structure to first accept particles during formation, then achieve the desired density for short-circuit resistance without blocking particle penetration.
Solution Approach 2:
The composite sheet is formed with low density before compression, allowing conductive polymer particles to penetrate and attach to fiber surfaces in advance. This preliminary low-density state enables particle infiltration, which is then preserved after the compression step increases density for improved short-circuit resistance.
2Reliability
If the density of the fiber structure is increased to improve short-circuit resistance, then short-circuit resistance is improved, but the amount of conductive polymer component attached decreases, resulting in increased ESR
Solution Approach 1:
The process separates the particle attachment phase from the density increase phase. During the composite sheet formation phase, low density allows maximum particle attachment. During the subsequent compression phase, density increases for short-circuit resistance while the previously attached particles remain on fiber surfaces.
Solution Approach 2:
Conductive polymer particles are attached to fiber surfaces during the low-density composite sheet formation phase before compression. This preliminary attachment ensures sufficient polymer quantity is present before the structure is compressed to high density for improved short-circuit resistance.
3Object-affected harmful factors
If a low-density fiber sheet is used to allow conductive polymer penetration, then ESR is reduced, but short-circuit resistance deteriorates
Solution Approach 1:
The manufacturing process segments the low-density particle-receptive state from the high-density short-circuit-resistant state. The composite sheet is formed at low density to allow polymer penetration and reduce ESR, then compressed to high density to achieve the required short-circuit resistance, combining benefits of both density states.
Solution Approach 2:
The composite sheet is preliminarily formed with low density to enable conductive polymer particle penetration and attachment, reducing ESR. Subsequently, compression increases density to improve short-circuit resistance while preserving the polymer attachment achieved during the low-density formation phase.
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 approach results in electrolytic capacitors with enhanced short-circuit resistance and reduced ESR, achieving a balance between these critical performance metrics.
Implementation Method 1
a first step of attaching a conductive polymer component to a fiber sheet to obtain a composite sheet
Implementation Method 2
a second step of compressing the composite sheet to obtain a separator
Data Source
AI summary
A method of manufacturing a separator for an electrolytic capacitor includes a first step of attaching a conductive polymer component to a fiber sheet to obtain a composite sheet, and a second step of compressing the composite sheet to obtain a separator. The density of the composite sheet before compression is less than 0.60 g/cm3.