BATTERY MANAGEMENT DEVICE, POWER SUPPLY, AND SOC ESTIMATION METHOD

摘要

A current-integrating estimation unit (51) estimates a battery SOC by integrating values of current flowing through the battery. An open voltage estimation unit (52) estimates the open voltage value of the battery from a value indicating the condition of the battery and including at least the measured voltage value of the battery, and identifies the SOC correspondent to the open voltage value. An SOC determination unit (53) estimates the SOC with high precision by using, whilst the battery is not charging/ discharging, the SOC estimated by the open voltage estimation unit (52), and using, whilst the battery is charging/discharging, the SOC estimated by the current-integrating estimation unit (51), said SOC being used as is or corrected by the SOC estimated by the open voltage estimation unit (52). An SOH estimation unit (54) estimates, in parallel with the SOC estimation, the battery SOH on the basis of a value of change for the SOC used by the SOC determination unit (53), and the integrated current value during the time period that was necessary for said change.