Two-stage charge equalization method and apparatus for series-connected battery string
US8354825B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 16, 2008 |
| Grant date | Jan 15, 2013 |
| Priority date | — |
| Expiry date | May 24, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/0018
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A two-stage charge equalization apparatus for a series-connected battery string includes a battery module having a plurality of batteries connected in series; a battery string having M (M≧2) battery modules connected in series; M charge control switch modules connected in parallel to each of the M battery modules; M second DC/DC converters connected to each of the M charge control switch modules; a single first DC/DC converter connected to the M second DC/DC converter; and a microprocessor controlling the charge control switch module, wherein the first DC/DC converter is inputted with an overall potential of the battery string and outputs a potential lower than the potential inputted and each of batteries composing the battery module shares the second DC/DC converter using the charge control switch module.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.