In-Case Anodizing via Cathode Passages for Capacitor Oxide Integrity
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Solution Overview
Problem
Conventional anodizing methods require transporting anodized anodes, which can damage the oxide layer, and involve large electrolyte tanks that may contain contaminants, leading to incomplete or inefficient anodization.
Innovation Solution
The method involves delivering formation electrolyte directly to the anode within the capacitor case through passages in the formation cathodes, allowing for continuous or intermittent delivery, ensuring complete anodization without transporting the anode and using a smaller amount of fresh electrolyte, thereby preventing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anodes are transported after anodizing, then the anodizing process can be completed, but the oxide layer may be damaged during transport
Solution Approach 1:
The anode is anodized in advance while still in the capacitor case, before any transport operations occur. This preliminary anodizing action ensures the oxide layer is formed and protected in situ, eliminating subsequent transport risks to the fragile oxide layer.
Solution Approach 2:
The anodizing process is merged with the capacitor assembly process by performing anodizing while the anode is already positioned in the final capacitor case. This combines two separate operations (anodizing and assembly) into one integrated process, eliminating the need for separate transport.
2Reliability
If large electrolyte tanks are used for anodizing, then complete anodization can be achieved, but contamination from the electrolyte increases
Solution Approach 1:
The electrolyte delivery system extracts only the necessary amount of electrolyte from a reservoir and delivers it directly to the anode surface through passages in the formation cathode. This eliminates the need for large tanks of electrolyte that could contain contaminants, using only the minimal amount needed for complete anodization.
Solution Approach 2:
The formation cathode acts as an intermediary device with internal passages that deliver electrolyte directly to the anode surface. This intermediary system enables precise electrolyte delivery without requiring direct contact between the anode and large volumes of potentially contaminated electrolyte in tanks.
3Loss of substance
If formation electrolyte is delivered directly to the anode through formation cathodes, then electrolyte usage is minimized, but the device complexity increases
Solution Approach 1:
The formation cathode serves multiple functions: it acts as the cathode for the anodizing reaction, provides structural support, and contains internal passages for electrolyte delivery. This multi-functionality reduces the need for separate electrolyte delivery components, minimizing overall device complexity while achieving precise electrolyte delivery.
Solution Approach 2:
The electrolyte delivery function is merged into the formation cathode structure itself. The passages are formed within the cathode material, combining the cathode and delivery system into a single integrated component, thereby reducing the number of separate parts and overall system complexity.
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 ensures complete anodization of the anode in a shorter time with minimal electrolyte usage, maintaining the oxide layer integrity and reducing contamination risks, while allowing for efficient assembly and use of unconventional capacitor shapes and materials.
Implementation Method 1
supplying formation electrolyte through passages in the formation cathode so that the formation electrolyte is in direct contact with the surface of the anode... an oxide layer forms on the anode over time
Implementation Method 2
anodizing and then inserted into the capacitor case... an oxide layer forms on the anode
Data Source
AI summary
A method of anodizing that is performed in the capacitor case. The anode and a formation cathode are inserted into the capacitor case. The formation cathode includes one or more passageways through which formation electrolyte is transferred to contact the surface of the anode. In one particular implementation, the anode includes several slots and the formation cathodes are plates that are inserted into the slots. One or more valves coupled to formation electrolyte storage tanks storing different electrolytes may be coupled to the formation cathode. A rinsing step can be performed by supplying water through the passageways in the formation cathode. Other implementations anodize outside the capacitor case.