Secondary battery state detecting device and secondary battery state detecting method
US9116213B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 20, 2013 |
| Grant date | Aug 25, 2015 |
| Priority date | — |
| Expiry date | Jul 16, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/389
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A current detecting unit (current sensor 12) detecting a current value of a current flowing in a secondary battery 14; an extreme value detecting unit (CPU 10a) detecting a first extreme value of a current after an inrush current flows from the secondary battery to a starter motor after electricity to the starter motor is turned on based on the current value; an inflection point detecting unit (CPU 10a) detecting a first inflection point of the current after the inrush current flows based on a variation of the current value per a predetermined time; and a calculation unit (CPU 10a) selecting the inflection point when timings when the extreme value and the inflection point are detected are separated for a predetermined time or more, and selecting either one of the extreme value or the inflection point in the other cases to set as a starting current, and calculating a starting voltage from the starting current, an internal resistance of the secondary battery, and a voltage before starting being a voltage of the secondary battery before the electricity to the starter motor is turned on, are included.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.