BATTERY MANAGEMENT DEVICE, BATTERY MANAGEMENT SYSTEM AND BATTERY MANAGEMENT METHOD

To improve the estimation accuracy of battery deterioration.SOLUTION: A battery management device includes: an open-circuit voltage acquisition unit for acquiring an open-circuit voltage of a battery; a current acquisition unit for acquiring a current value; a battery remaining amount acquisition unit for acquiring a remaining battery level based on information indicating the relation between the open-circuit voltage and the battery remaining amount; a battery remaining amount difference calculation unit for calculating a difference between the battery remaining amount at the start of charging and the battery remaining amount at the end of charging; an integrated current value calculation unit for calculating an integrated current value from the start of charging to the end of charging; a full charging capacity calculation unit for calculating a full charging capacity based on the difference in the remaining battery amount and the integrated current value; and a deterioration degree index estimation unit for estimating a deterioration degree index which is a ratio of a present full charge capacity to the full charge capacity at an initial stage of use. The deterioration degree index estimation unit estimates the deterioration degree index based on a measured value of the deterioration degree index calculated as the ratio of the present full charge capacity to the full charge capacity at the initial stage of use, an estimated value of the deterioration degree index for past charging, and a correction value which changes according to the difference of the battery remaining amount in each charging.SELECTED DRAWING: Figure 2 【課題】電池の劣化度の推定精度を向上させる。【解決手段】電池の開放電圧を取得する開放電圧取得部と、電流値を取得する電流取得部と、開放電圧と電池残量との関係を示す情報に基づき電池残量を取得する電池残量取得部と、充電の開始時と終了時との電池残量の差分を算出する電池残量差分算出部と、充電開始時から終了時までの積算電流値を算出する積算電流値算出部と、電池残量の差分及び積算電流値に基づいて、満充電容量を算出する満充電容量算出部と、使用初期における満充電容量に対する、今回の満充電容量との比である劣化度指標を推定する劣化度指標推定部と、を備えた電池管理装置であって、劣化度指標推定部は、使用初期の満充電容量に対する、今回の満充電容量との比として算出される劣化度指標の測定値と、過去の充電に対する劣化度指標の推定値と、それぞれの充電における電池残量の差分に応じて変化する補正値とに基づき劣化度指標を推定する。【選択図】図２