Fault determination apparatus and fault determination method for a battery set
US6477024B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 2000 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Mar 7, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/386
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
By finding a voltage difference &Dgr;V between the maximum value and the minimum value of voltage of each cell constituting a battery set and then combining the voltage difference &Dgr;V with current I passing through the battery set into a value pair and store a plurality of the value pairs, the relationship between the voltage difference &Dgr;V and the current I is a relation represented by a straight line with the slope &Dgr;R thereof corresponding to an internal-resistance difference. Therefore, fault in the battery set can be determined from the magnitude of the slope &Dgr;R computed by a least-squares method. Fault determination for a battery set is made more accurate because variations in electromotive force caused by charge-and-discharge patterns and by changes in temperature are canceled when the voltage difference &Dgr;V is determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.