Method of making a trilayer battery separator

Details Method of making a trilayer battery separator Method of making a trilayer battery separator

1997-04-15

1999-09-14

Kalafut, Steven J.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Separator, retainer or spacer insulating structure

296234, 26417111, 264175, 2642884, H01M 214

Patent

active

059521201

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.

REFERENCES:
patent: 4650730 (1987-03-01), Lundquist et al.
patent: 4731304 (1988-03-01), Lundquist et al.
patent: 5240655 (1993-08-01), Troffkin et al.
patent: 5281491 (1994-01-01), Rein et al.
patent: 5691077 (1997-11-01), Yu

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