Means for estimating charged state of battery and method for estimating degraded state of battery
US6285163A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 2000 |
| Grant date | Sep 4, 2001 |
| Priority date | — |
| Expiry date | Nov 24, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/374
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Means for estimating the charged state of a battery, capable of accurately estimating an SOC even though the battery repeats charging/discharging in short cycles. The charging/discharging current Ib measured by current sensing means (10) is integrated, and pseudo-SOC estimating means estimates a pseudo-SOC. Electromotive force estimating means (16) estimates the open voltage Voc from the pseudo-SOC. Voltage change estimating means (18) estimates the voltage change Vr due to the internal resistance from the charging/discharging current Ib. Dynamic voltage change estimating means (20) estimates the voltage change Vdyn due to the change of the charging/discharging current. An adder (22) adds the Voc, Vr, and Vdyn to calculate an estimated voltage Vest of the battery. SOC correction calculating means (26) calculates the correction of the SOC for equalizing the estimated voltage Vest to the measured voltage Vmes measured by voltage sensing means (12), and an adder (28) adds the correction to the pseudo-SOC to estimate the SOC of the battery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.