Method for improved impregnation of electrolytic capacitors with a polymer based electrolyte
US6468317B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 2000 |
| Grant date | Oct 22, 2002 |
| Priority date | — |
| Expiry date | Jan 6, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01G9/0036
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention relates to an improved method of impregnating electrolytic capacitor stacks or wound rolls with a polymer based electrolyte, such as a hydroxyethylmethacrylate (HEMA) or hydroxyethylacrylate (HEA) based electrolyte, to render them suitable for use in electrolytic capacitors, and to such electrolytic capacitors. The initiator to promote the polymerization of the polymer based electrolyte and a surface active wetting agent are deposited on the foil or in the stack or wound roll prior to impregnation of the stack or wound roll with a polymer based electrolyte, allowing the polymer based electrolyte solution to be warmed prior to impregnation to a temperature suitable for easy impregnation into the anode and cathode foil and paper. Polymerization does not begin until impregnation of the capacitor with the polymer based electrolyte and the surfactant allows the polymer based electrolyte to more fully incorporate itself into the microscopic features of the anode foil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.