In-situ pore generation in lead-acid battery separator using electrolyte-soluble pore former
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United States of America Patent
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Nov 26, 2013
Grant Date -
Feb 24, 2011
app pub date -
May 15, 2008
filing date -
May 15, 2007
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Abstract
A microporous polyethylene battery separator material (212), for use in a flooded-cell type lead-acid battery, benefits from increased porosity, enhanced wettability, and exceptionally low electrical resistance when an electrolyte-soluble pore former is employed in the manufacturing process. The pore former (210) is soluble in electrolytic fluid and therefore dissolves in-situ in sulfuric acid during battery assembly. The dissolution of the pore former leaves behind additional, larger voids (220) in the separator material and thereby enhances ionic diffusion and improves battery performance.
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