State-of-charge coulometer
US4499424A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 9, 1982 |
| Grant date | Feb 12, 1985 |
| Priority date | — |
| Expiry date | Apr 9, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/378
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A coulometer for accurately measuring the state-of-charge of an open-cell battery utilizing an aqueous electrolyte. The coulometer includes a current meter (38) for measuring the battery charge/discharge current and a flow meter (42) for measuring the rate at which the battery produces gas during charge and discharge. Coupled to the flow meter is gas analyzer (54) which measures the oxygen fraction of the battery gas. The outputs of the current meter, flow meter and gas analyzer are coupled to a programmed microcomputer which includes a CPU (68) and program and data memories (74), (76). The microcomputer calculates that fraction of charge and discharge current consumed in the generation of gas so that the actual state-of-charge can be determined. The state-of-charge is then shown on a visual display (80).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.