BATTERY LIFE DIAGNOSTIC DEVICE AND BATTERY LIFE DIAGNOSTIC METHOD

PROBLEM TO BE SOLVED: To make a diagnosis of a battery life according to the state of each battery.SOLUTION: A battery life diagnosis device comprises a storage unit 22 for storing duration of use of a battery 11 measured for each time point and a measurement value of a deterioration index indicating deterioration of the battery 11 measured for each time point, and a processing unit 23 for diagnosing a life of the battery 11. The processing unit 23 determines a time change amount of the deterioration index on the basis of the duration of use of the battery 11 and the measurement value of the deterioration index, determines a prediction function of the deterioration index for each battery on the basis of the time change amount of the deterioration index and determines a prediction value of the deterioration index on the basis of the prediction function of the deterioration index to diagnose a life of the battery 11 on the basis of the prediction value of the deterioration index.SELECTED DRAWING: Figure 1 【課題】電池の個々の状態に応じて電池の寿命を診断する。【解決手段】時刻ごとに測定された電池１１の使用時間と、時刻ごとに測定された電池１１の劣化を示す劣化指標の測定値を記憶する記憶部２２と、電池１１の寿命を診断する処理部２３とを有し、処理部２３は電池１１の使用時間と劣化指標の測定値に基づいて前記劣化指標の時間変化量を求め、劣化指標の時間変化量に基づいて個々の電池ごとに劣化指標の予測関数を求め、劣化指標の予測関数に基づいて劣化指標の予測値を求め、劣化指標の予測値に基づいて電池１１の寿命を診断する。【選択図】図１