Trilayer battery separator

Details Trilayer battery separator Trilayer battery separator

H - Electricity

01

M

H01M 2/16 (2006.01) B29C 55/00 (2006.01) B32B 5/18 (2006.01) H01M 6/50 (2006.01)

Patent

CA 2259786

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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