Patent · US Active

Multilayer hybrid battery separators for lithium ion secondary batteries and methods of making same

US9455432B2 · kind B2 · utility

2Cited by

10References

17Claims

0Family size

Assignee

Celgard, LLC · US

Inventors

Lie Shi · Matthews, US
Jill V. Watson · Tega Cay, US
Ronald W. Call · Rock Hill, US
Ronnie E. Smith · Huntersville, US

Key dates

Filing date	Mar 14, 2014
Grant date	Sep 27, 2016
Priority date	—
Expiry date	Mar 14, 2034

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02E60/10
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A multi-layered battery separator for a lithium secondary battery includes a first layer of a dry processed membrane bonded to a second layer of a wet processed membrane. The first layer may be made of a polypropylene based resin. The second layer may be made of a polyethylene based resin. The separator may have more than two layers. The separator may have a ratio of MD/TD tensile strength in the range of about 1.5-3.0. The separator may have a thickness of about 35.0 microns or less. The separator may have a puncture strength of greater than about 630 gf. The separator may have a dielectric breakdown of at least about 2000V.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.