Method of predicting the state of charge as well as the use time left of a rechargeable battery
US6515453B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2001 |
| Grant date | Feb 4, 2003 |
| Priority date | — |
| Expiry date | Nov 30, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/3828
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed is a method of estimating the state of charge of a rechargeable lithium battery. The first step of said method is to determine whether the battery is in an equilibrium state or in a non-equilibrium state. If the battery is determined to be in an equilibrium state, the voltage across the battery is measured and converted into an equilibrium state-of-charge value. If the battery is in a non-equilibrium state, the charge withdrawn from or supplied to the battery is calculated by means of current integration, and this charge is subtracted from or added to a state-of-charge value calculated earlier.Also disclosed is a method of estimating the time that an application can be used under predefined conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.