Alkaline cell with improved casing
US6555266B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1998 |
| Grant date | Apr 29, 2003 |
| Priority date | — |
| Expiry date | Nov 1, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to electrochemical cells having a metal current collector, particularly zinc/MnO2 primary alkaline cells wherein the cathode metal current collector is the cell's steel casing. The present invention is directed to a coating on the current collector, such as the inside surface of the steel casing of an alkaline cell, to improve the cell's performance, particularly when it is used for high power applications. In accordance with the invention the current collector or inside surface of the steel casing for the cell, is preferably preplated with nickel, then plated with a layer of cobalt or cobalt alloy, and subsequently coated with a layer of carbon over the cobalt layer. The carbon may be applied from a carbon/solvent coating mixture which is dried to evaporate the solvent carrier. The service life of the cell is improved, particularly during high power applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.