Determining battery capacity using one or more applications of a constant power load
US6313609A · kind A · utility
Inventor
Key dates
| Filing date | Oct 19, 2000 |
| Grant date | Nov 6, 2001 |
| Priority date | — |
| Expiry date | Oct 19, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/0048
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system and associated methodology for quickly and accurately determining a remaining capacity of a battery. The system measures battery terminal voltage during each application of one or more constant power loads to the battery, and compares either the measured voltage, or an internal impedance calculated from the measured voltage, with a pre-characterization of the relationship between battery capacity and battery voltage or impedance for the given battery type and operating conditions. This relationship may be obtained from data provided by the battery manufacturer, derived empirically or otherwise determined. This relationship may be represented by data stored in memory or by a mathematical function implemented in hardware, software, firmware or a combination thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.