Microprocessor-based state of charge gauge for secondary batteries
US4333149A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 1980 |
| Grant date | Jun 1, 1982 |
| Priority date | — |
| Expiry date | Mar 6, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/3842
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A state of charge gauge for measuring the state of charge of secondary batteries, such as the type employed in electric vehicles, includes a microprocessor which, when supplied with data varying in accordance with battery discharge current and battery terminal voltage, determines battery resistance. Having determined battery resistance which is a dynamically varying parameter dependent on battery temperature and age, the microprocessor computes the total battery charge capacity. Comparison of the quantity of battery charge already depleted with the previously computed total battery charge capacity yields an accurate indication of remaining battery charge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.