Method of making a trilayer battery separator
US5952120A · kind A · utility
58Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1997 |
| Grant date | Sep 14, 1999 |
| Priority date | — |
| Expiry date | Apr 15, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49114
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.