| 摘要 |
An SOC-estimation-value-depending gain selection unit (46) multiplies the deviation of an SOC estimation value (last calculated value) relative to an estimated SOC (#SOCb) by a correction gain G1 to calculate a correction value. The SOC-estimation-value-depending gain selection unit (46) selects a relatively small correction gain G1 in the case where the SOC estimation value (last calculated value) lies in the range in proximity to excessive charging and the SOC estimation value (last calculated value) is corrected to a smaller value (toward the SOC control center), and in the case where the SOC estimation value (last calculated value) lies in the range in proximity to excessive discharging and the SOC estimation value (last calculated value) is corrected to a larger value (toward the SOC control center). Thus, the correction is performed so as to indicate the safe side value for the secondary battery in charge/discharge control in the case where the SOC estimation value (last calculated value) is in proximity to excessive charging or excessive discharging.
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