MEANS FOR ESTIMATING CHARGED STATE OF BATTERY AND METHOD FORESTIMATING DEGRADED STATE OF BATTERY

摘要

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 sensin g means (10) is integrated, and pseudo-SOC estimating means estimates a pseudo - SOC. Electromotive force estimating means (16) estimates the open voltage Vo c from the pseudo-SOC. Voltage change estimating means (18) estimates the voltage change Vr due to the internal resistance from the charging/dischargi ng current Ib. Dynamic voltage change estimating means (20) estimates the volta ge 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 th e battery. SOC correction calculating means (26) calculates the correction of the SOC for equalizing the estimated voltage Vest to the measured voltage Vm es measured by voltage sensing means (12), and an adder (28) adds the correctio n to the pseudo-SOC to estimate the SOC of the battery.