Active equalization method and system of lithium iron phosphate battery pack
US10027134B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 4, 2016 |
| Grant date | Jul 17, 2018 |
| Priority date | — |
| Expiry date | Oct 14, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present application relates to an active equalization method and system of a lithium iron phosphate (LFP) battery pack. The method includes the following steps of: determining, for each cell in the LFP battery pack, a voltage range in which a State of Charge (SoC) can be accurately queried, and determining a corresponding relation between a voltage at which the SoC can be accurately queried and the SoC; sampling an open circuit voltage of each cell in the LFP battery pack in a quiescent state; judging whether the open circuit voltage is within the voltage range in which the SoC can be accurately queried; if the open circuit voltage is within the voltage range in which the SoC can be accurately queried, acquiring the SoC of a cell corresponding to the open circuit voltage according to the open circuit voltage and the corresponding relation between the voltage at which the SoC can be accurately queried and the SoC, and determining an equalized capacity of each cell according to the SoC of each cell; performing active equalization processing on the LFP battery pack based on the equalized capacities of respective cells in the LFP battery pack.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.