Prismatic capacitor
US6707660B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Apr 21, 2003 |
| Grant date | Mar 16, 2004 |
| Priority date | — |
| Expiry date | Apr 21, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01G9/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A flat capacitor and a method of making the flat capacitor, the capacitor having a one-piece metal foil case. The capacitor includes a metal foil case with a flange, the case being made of a blank that is folded onto itself so the peripheral flanges are brought into mutual contact and welded. A lead extends from an anode within the capacitor through a hole in the capacitor case in the fold. An elastomeric body inserted in the hole and surrounding the lead provides electrical insulation and a seal is produced when the metal foil blank is folded to close the case of the capacitor. Preferably, the anode is a wet slug anode, such as sintered tantalum having an oxide coating, and the inside surface of the metal foil case is preferably coated with a porous metal oxide, such as ruthenium oxide, providing a capacitor with high energy storage density and breakdown voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.