Methods and systems for updating state of charge estimates of individual cells in battery packs
US11664670B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 2022 |
| Grant date | May 30, 2023 |
| Priority date | — |
| Expiry date | Aug 21, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/007186
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Described herein are methods and systems for updating SOC estimates of individual cells in battery packs. Specifically, SOC estimates are updated in-situ, e.g., while the battery packs remain operational. For example, a cell is charged or discharged, independently from other cells, until the cell OCV is at a set value, corresponding to one of target zones. The target zones have more prominent correlations between the OCV and SOC than other parts of the OCV profile. A new SOC value, corresponding to the cell OCV, is used to update the SOC estimate. In some examples, a set of voltages is obtained while the cell is charged or discharged at a constant current/power, e.g., outside of the target zones. One or more differential capacities are determined from this voltage set, and a new SOC value is obtained based on these differential capacities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.