Separator insert for electrochemical cells
US5631102A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 1996 |
| Grant date | May 20, 1997 |
| Priority date | — |
| Expiry date | Feb 12, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A separator insert used in addition to the main separator in an electrochemical cell, is described. A preferred material for the separator insert is a woven or nonwoven fluropolymeric material such as tetrafluoroethylene-ethylene copolymer (PETFE). This polymeric material is chemically inert to the components used in alkali metal cells, is corrosion resistant and does not decompose at normal battery temperatures. Preferably, the separator insert covers at least each side of the cathode means in a spirally wound electrode stack and extends less than one-half the total length thereof. This provides additional protection against internal short circuit conditions due to tearing or puncture of the traditional separator cause by exposed electrode screens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.