Method for estimating the state of health of a battery
US10989761B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 16, 2015 |
| Grant date | Apr 27, 2021 |
| Priority date | — |
| Expiry date | Jun 3, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01M2010/4271
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method calibrates a battery allowing calibration data linked to its state of health to be memorized. The method includes determining at least one characteristic state of the battery, between fully charged and fully discharged, by detecting a peak in variation of the derivative of its open-circuit voltage while charging or discharging the battery, or at least one characteristic state when it is fully charged or fully discharged, or defined by crossing of a voltage, or current, threshold in a constant current, or constant voltage, phase while charging or discharging the battery. The method also includes defining a reference state of the battery based on this characteristic state and measuring the open-circuit voltages of the battery in the reference state for multiple different states of health and memorizing these calibration data including at least some pairs of actual state of health/open-circuit voltage values in an electronic memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.