Use of etch resist masked anode frame for facilitation of laser cutting, particle and leakage current reduction
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United States of America Patent
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Nov 3, 2020
Grant Date -
Dec 20, 2018
app pub date -
Aug 24, 2018
filing date -
Jan 15, 2016
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Abstract
The present invention is directed to a method of etching anode foil in a non-uniform manner which minimizes thermal oxidation during foil cutting. Having less oxide improves the ability to cut through aluminum anodes with lower energy rates. In aluminum foils, it has been found that a masking step before etching reduces conversion of boehmite aluminum oxide to alpha-phase corundum during laser cutting of anodes, which increases edge quality and productivity. Additionally, the non-etched anode frame allows for less surface area to form during the aging process. As a result, the leakage current is reduced by the proportion of edge to anode surface area, and the aging process will be faster, leading to higher productivity.
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