Method for monitoring battery discharge by determining the second derivative of battery voltage over time
US5278509A · kind A · utility
41Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1992 |
| Grant date | Jan 11, 1994 |
| Priority date | — |
| Expiry date | Feb 3, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/378
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The state of charge of a rechargeable battery (12), such as those made from lithium, nickel-cadmium or metal hydrides, can be accurately determined by monitoring the rate of change of battery voltage over time (dv/dt), which parameter has empirically been found to change dramatically as the battery reaches complete discharge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.