Stepped Cathode Capacitor Housing to Protect Conductive Coatings
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Solution Overview
Problem
Capacitors face mechanical damage to the electrically conductive coating due to direct contact with the separator element, leading to potential short circuits and increased series resistance, which degrades their efficiency and reliability.
Innovation Solution
The capacitor design incorporates recesses or depressions in the housing inner surface, with the electrically conductive coating placed within these recesses, and the separator element is supported by protrusions or bars, reducing direct contact with the coating and minimizing mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the separator element is placed in direct contact with the electrically conductive coating, then the structural support is simplified, but the coating is exposed to mechanical stress and may be damaged by abrasion
Solution Approach 1:
The patent introduces an intermediary structure (protrusion or web) between the separator element and the electrically conductive coating. This intermediary supports the separator element mechanically while preventing direct contact with the coating, thereby eliminating abrasion damage and short circuits without complicating the overall structure.
2Reliability
If the thickness of the separator element is increased to protect the coating, then the mechanical protection is improved, but the electrical series resistance is increased and efficiency decreases
Solution Approach 1:
The patent segments the separator element's function into two distinct parts: a support function performed by the protrusion or web structure, and an insulation function performed by the separator material itself. This segmentation allows the separator to be thin (reducing electrical resistance) while still providing adequate mechanical protection through the distributed support structure.
Solution Approach 2:
The patent applies local quality by concentrating mechanical support at specific locations (protrusions or webs) rather than requiring uniform thickness throughout the separator. This allows the separator to be thin in most areas (low resistance) while having localized reinforcement where mechanical support is needed.
3Reliability
If a mechanically stable coating is used to resist abrasion, then the coating durability is improved, but the manufacturing cost and complexity increase
Solution Approach 1:
The patent converts the potential harm of mechanical stress into a benefit by designing a structure where the separator element's position is controlled by protrusions or webs. This allows the use of cheaper, less mechanically stable coatings since the structure itself prevents abrasion, rather than relying on the coating's inherent mechanical properties.
Data Source
AI summary
The present invention relates to a capacitor having an electrically conductive housing with a housing inner surface and a housing interior substantially defined by the housing inner surface, at least one first electrode having a first polarity and being arranged in the housing interior, at least one separator element being arranged between the housing inner surface and the at least one first electrode, and an electrically conductive coating being arranged between the housing inner surface and the at least one separator element. The housing inner surface includes at least one recess, and the electrically conductive coating is arranged in the at least one recess.