Battery power source protecting device for an electromotive device
US6388426B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 2001 |
| Grant date | May 14, 2002 |
| Priority date | — |
| Expiry date | May 18, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/00306
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control circuit measures the battery voltage, intermediate voltage and discharge current of a rechargeable battery comprising a plurality of cells connected in series, at prescribed time intervals, and detects values for these parameters based on running averages for a prescribed number of measurement operations, while also detecting the battery temperature. If the battery temperature becomes equal to or greater than a prescribed temperature, or if the discharge current is an excessive current equal to or greater than a prescribed value, or if the battery voltage is equal to or less than a prescribed value, or if it is judged, from detection of the intermediate voltage that the balance between cell capacities has declined, then the control circuit halts discharge from the rechargeable battery by switching an FET to OFF.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.