Trilayer battery separator
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United States of America Patent
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-
Jan 30, 2001
Grant Date -
N/A
app pub date -
Mar 12, 1998
filing date -
Mar 12, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A trilayer shutdown battery separator is provided having two microporous strength layer membranes sandwiching one microporous shutdown layer membrane. The strength layers are made by a stretch method. The shutdown layer is made by a phase inversion method. The preferred method of making such a trilayer separator comprises: making microporous strength layers by a stretch method; forming a microporous shutdown layer by phase inversion process; and bonding two microporous strength layers and one microporous shutdown layer into the trilayer battery separator.
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