BATTERY SEPARATOR AND METHOD FOR PRODUCING SAME
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United States of America Patent
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Issued Date -
Feb 19, 2015
app pub date -
Mar 18, 2013
filing date -
Mar 29, 2012
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Abandoned
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Abstract
A battery separator includes a porous membrane A and a porous membrane B laminated on the porous membrane A, the porous membrane A including a polyolefin resin, the porous membrane B including a polyamide-imide resin and inorganic particles or cross-linked polymer particles, wherein the particles are contained in an amount of 80% by weight to 97% by weight of the porous membrane B and have an average diameter that is not less than 1.5 times and less than 50 times the average pore size of the porous membrane A. The battery separator has excellent heat resistance and processability (electrolyte permeability, low curling property) and is characterized in that the air resistance increase due to lamination of a heat resistant resin is extremely small.
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