Autonomous battery cell balancing system with integrated voltage monitoring
US6873134B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 2003 |
| Grant date | Mar 29, 2005 |
| Priority date | — |
| Expiry date | Sep 1, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/0048
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An autonomous lithium-ion cell balancing system with integrated voltage monitoring includes a lithium-ion battery having a plurality of cells, a cell balancing circuit and a cell balancing control circuit. The heart of the cell balancing circuit is a plurality of gated cell balancing converters that are connected with the battery cells and a common share bus. Each gated lithium-ion cell balancing converter receives and input drive voltage and an input sample voltage and transfers energy from highly charged lithium-ion cells to the less charged lithium-ion cells, forcing all cells to have the same energy level. Further, the gated cell balancing converter provides a telemetry output voltage analog to an input cell voltage, eliminating the need for a separate cell voltage monitor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.