Method of making a trilayer battery separator
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United States of America Patent
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Sep 14, 1999
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N/A
app pub date -
Apr 15, 1997
filing date -
Apr 15, 1997
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Abstract
A method of making a trilayer, shutdown battery separator has the following steps: extruding a polyethylene precursor; extruding a polypropylene precursor; forming a trilayer precursor, the trilayer precursor having the polyethylene precursor sandwiched between two polypropylene precursors; bonding the trilayer precursor; annealing the trilayer precursor; stretching the trilayer precursor; and forming thereby the battery separator.
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