Conductive Masking in Electrolytic Etching
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Solution Overview
Problem
Conventional electrolytic etching methods using resin masking members concentrate current near boundaries, leading to excessive etching and reduced mechanical strength of metal foils, which decreases the reliability of electrode foils.
Innovation Solution
The use of an electrically connected masking member made of conductive materials, such as valve metals or conductive polymers, to reduce current concentration and prevent excessive etching near boundaries during electrolytic etching, thereby maintaining the mechanical strength of the metal foils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a resin masking member is used in electrolytic etching, then the etching process can be performed, but current concentrates near boundaries causing excessive etching and reduced mechanical strength
Solution Approach 1:
The patent changes the electrical conductivity parameter of the masking member from insulating (resin) to conductive (metal or conductive polymer). This parameter change redistributes the current density during electrolytic etching, preventing current concentration at boundaries and thereby eliminating excessive etching while maintaining manufacturing precision and mechanical strength.
Solution Approach 2:
The patent introduces a conductive masking member as an intermediary between the electrode and the metal foil. This conductive intermediary redistributes the electrical current uniformly across the etching area, preventing current concentration at boundaries and thereby preventing excessive etching that would compromise mechanical strength.
2Manufacturing precision
If a resin masking member is used in electrolytic etching, then the etching process can be performed, but the reliability of electrode foils decreases due to strength loss
Solution Approach 1:
The patent changes the electrical conductivity parameter of the masking member from insulating to conductive. This parameter change ensures uniform current distribution during etching, preventing localized excessive etching that would create weak points and thereby maintaining both etching control and electrode foil reliability.
Solution Approach 2:
The conductive masking member acts as an intermediary that mediates current distribution during etching. By introducing this conductive intermediary, the patent achieves uniform etching throughout the area while preventing boundary concentration effects, thereby maintaining structural integrity and reliability of the electrode foil.
3Productivity
If current is applied between metal foil and electrode in electrolytic etching, then etching is achieved, but excessive etching occurs near boundaries reducing foil strength
Solution Approach 1:
The patent changes the electrical conductivity parameter of the masking member from insulating (resin) to conductive (metal or conductive polymer). This parameter change redistributes current density uniformly across the etching area, maintaining high etching efficiency while preventing excessive etching at boundaries that would compromise mechanical strength.
Solution Approach 2:
The conductive masking member serves as an intermediary that optimizes current distribution during electrolytic etching. It maintains high etching efficiency by enabling sufficient current flow while simultaneously preventing current concentration at boundaries, thereby achieving both productivity and structural integrity.
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 electrode foils by minimizing mechanical strength loss near boundaries and allowing for more flexible handling and processing of the metal foils during the etching process.
Implementation Method 1
The masking member is an electric conductor. The masking member is electrically connected with the metal foil.
Implementation Method 2
an electrolytic etching step of etching a metal foil containing first metal by applying current between the metal foil and an electrode in etching liquid
Data Source
AI summary
A method for producing an electrode foil includes an electrolytic etching step of etching a metal foil containing first metal by applying current between the metal foil and an electrode in etching liquid while a principal surface of the metal foil faces the electrode. A masking member is disposed between the principal surface of the metal foil and the electrode so as to cover a partial region of the principal surface. The masking member is an electric conductor. The masking member is electrically connected with the metal foil.