Methods and apparatus for dynamic estimation of battery open-circuit voltage
US9658291B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2013 |
| Grant date | May 23, 2017 |
| Priority date | — |
| Expiry date | Feb 15, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/70
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
This invention provides methods for dynamic estimation of the open-circuit voltage of a battery. In some embodiments, an impulse response is calculated using a matrix-based algorithm or a recursive algorithm. Then, a current response is calculated by convolving the impulse response with the measured current. The open-circuit voltage of the battery is derived by subtracting the current response from the measured voltage. Using the principles disclosed to estimate OCV, a lithium-ion battery may be managed with a battery-state estimator that allows accurate and timely estimation of the state of charge, the charge and the discharge power capabilities, and the state of health of the battery. These methods are able to accept various exciting signals, are stable and robust against noises, even when diffusion is a limiting kinetic factor in the battery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.