BATTERY CHARGE STATE DETECTION DEVICE

摘要

PROBLEM TO BE SOLVED: To effectively correct an SOC-electromotive voltage characteristic. SOLUTION: When an SOC reaches a predetermined low level, a battery ECU 14 sends a charge request to an HVECU 20. Thereby, the HVECU 20 controls a load 22 so that a battery 10 is charged. When the SOC rises to a predetermined value, the battery ECU 14 compares an SOC variation (ΔSOC (electromotive voltage)) during a period in which forcible charging was carried out with the variation amount of the SOC (ΔSOC (accumulation)) provided by accumulating a battery current detected by a current detector 18, and corrects an SOC-electromotive voltage characteristic based on the comparison result.