Conductive polymer PTC battery protection device and method of making same
US6124781A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1999 |
| Grant date | Sep 26, 2000 |
| Priority date | — |
| Expiry date | Sep 29, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A battery protection device includes an upper foil electrode laminated to the upper surface of a conductive polymer PTC layer, and a lower foil electrode laminated to the lower surface of the PTC layer. An isolated portion of the lower electrode is formed by creating an annular isolation gap in the lower electrode. A first via is formed through the upper electrode, the PTC layer, and the isolated portion of the lower electrode. The diameter of the first via is smaller than the diameter of the isolated electrode portion, so that an annular area of the isolated electrode portion is left between the opening and the isolation gap. The internal wall surface of the first via and the annular electrode area are plated with a conductive metallization layer, which forms a first contact seat that is conductively connected by the metallized surface of the first via with the upper electrode. A first contact element is fixed to the first contact seat. An area of the lower electrode, spaced from the isolated portion, is metal-plated. A second via is formed through the upper electrode, the PTC layer, and the metal-plated area of the lower electrode, with an opening in the metal-plated area. The di…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.