Battery separator and method of making same

Details Battery separator and method of making same Battery separator and method of making same

H - Electricity

01

M

H01M 2/14 (2006.01) B29C 47/00 (2006.01) B29D 7/01 (2006.01) B32B 27/32 (2006.01) H01M 2/16 (2006.01) H01M 2/18 (2006.01)

Patent

CA 2472281

A battery separator comprises a multi-layered film, individual layers of said film having been bonded together by heat and pressure, having a peel strength of greater than or equal to 40 grams per inch (1.6 g/mm) and a thickness of < 25 microns. A method for making a battery separator comprises the steps of: extruding and winding up a first precursor film, extruding and winding up a second precursor film, unwinding the first and second precursor films, stacking up the first and second precursor films to form a single stacked precursor, laminating the single stacked precursor film, winding up the laminated single stacked precursor film, stacking up a plurality of laminated single stacked precursor films, and making microporous the stacked plurality of laminated single stacked precursor films.

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