US 11,862,769 B2
Battery separators for E-rickshaw and similar vehicle lead acid batteries
Surendra Kumar Mittal, Bangalore (IN); and Naveen Prabhu Shanmugam, Bangalore (IN)
Assigned to Daramic, LLC, Charlotte, NC (US)
Filed by Daramic, LLC, Charlotte, NC (US)
Filed on Jan. 11, 2017, as Appl. No. 15/403,700.
Application 15/403,700 is a continuation of application No. PCT/US2016/012826, filed on Jan. 11, 2016.
Prior Publication US 2017/0200984 A1, Jul. 13, 2017
Int. Cl. H01M 10/42 (2006.01); H01M 50/44 (2021.01); H01M 10/06 (2006.01); H01M 50/417 (2021.01); H01M 50/489 (2021.01); H01M 50/437 (2021.01); H01M 50/454 (2021.01)
CPC H01M 10/4235 (2013.01) [H01M 10/06 (2013.01); H01M 50/417 (2021.01); H01M 50/437 (2021.01); H01M 50/44 (2021.01); H01M 50/454 (2021.01); H01M 50/489 (2021.01); H01M 2220/20 (2013.01); Y02E 60/10 (2013.01); Y02P 70/50 (2015.11)] 19 Claims
OG exemplary drawing
 
1. A separator for use in a battery for an electric rickshaw comprising:
a porous membrane comprising polyolefin, filler, and a plasticizer; from about 4.0-10.0 g/m2 of one or more additives selected from the group consisting of polysaccharides, organosilicone based surfactants, quarternary amines, polyethoxylated alcohol, ethylene vinyl acetate terpolymers, ethoxylated alkyl aryl phosphate esters, and sucrose esters of fatty acid; cross ribs having a height from about 0.075-0.15 mm;
longitudinal ribs having a height from about 0.075-0.15 mm; and a back-web thickness of 0.20-0.35 mm; and
a fibrous layer on at least one face of the porous membrane, the fibrous layer is from about 0.75-1.25 mm thick,
the separator having a total thickness of about 0.425-3.0 mm, the separator or membrane being an envelope having one or more slits along and parallel to a bottom fold of the envelope.