Device for accurate detection of remaining discharge capacities of a plurality of batteries
US5739671A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 15, 1996 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | May 15, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/70
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A charge state detecting device has a battery device including a plurality of batteries connected in series, a current sensor which detects a current flowing from the battery device, and a voltage sensor which detects the voltage of each of the batteries. A main controller calculates a correlation between discharge current and battery voltage, and provides an estimated voltage of each battery of the batteries under a constant energy discharge, based on the correlation. The estimated voltages for the batteries are used for deriving the capacity of each battery with reference to a voltage-capacity characteristic, which is stored in advance. The main controller supplies to a display indicator the minimum one of the derived capacities to warn of an impending need to charge the batteries.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.