Multilayer battery separators

Details Multilayer battery separators Multilayer battery separators

H - Electricity

01

M

H01M 2/14 (2006.01) B32B 27/32 (2006.01) B32B 37/28 (2006.01) H01M 2/16 (2006.01) H01M 2/18 (2006.01) H01M 10/42 (2006.01)

Patent

CA 2418600

A microporous battery separator is provided having a first co- extruded multilayered portion and a second co-extruded multilayered portion. The two portions are bonded together. In a preferred embodiment, the battery separator has two substantially identical multilayered portions bonded together face-to-face. Each of the two multilayered portions has at least one strength layer and at least one shutdown layer. Methods for making the battery separators are also provided. Preferably, a tubular multilayered film is extruded, and collapsed onto itself to form a multilayered battery separator precursor. The precursor is then bonded and annealed before it is stretched to form a microporous multilayer battery separator.

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