REMAINING BATTERY LIFE ESTIMATION DEVICE, REMAINING BATTERY LIFE ESTIMATION SYSTEM, BATTERY PACK, AND METHOD FOR ESTIMATING REMAINING BATTERY LIFE

PROBLEM TO BE SOLVED: To provide a remaining battery life estimation device, a remaining battery life estimation system, a battery pack, and a method for estimating a remaining battery life with which it is possible to estimate the remaining life of a battery with high accuracy by a simple process.SOLUTION: A remaining battery life estimation device 30 estimates the remaining life of a battery 20 that includes an electrode whose stage structure changes in accordance with the storage amount of electricity, the device comprising: a current monitor 31B for monitoring a current value flowing in the battery 20; a voltage monitor 31A for monitoring the voltage value of the battery 20; a coulomb counter 35 for integrating the current values monitored by the current monitor 31B; a differential circuit 33 for detecting the differential value of voltage values monitored by the voltage monitor 31A; a reset detection circuit 34 for resetting cumulative errors due to current integration by the coulomb counter 35 utilizing the inflection points of differential values detected by the differential circuit 33; and a remaining life estimation unit 36 for estimating the remaining life of the battery 20 on the basis of the value of the coulomb counter 35.SELECTED DRAWING: Figure 5 【課題】簡単な処理で精度よく蓄電池の残量を推定することが可能な電池残量推定装置、電池残量推定システム、バッテリーパック、および電池残量推定方法を提供する。【解決手段】電池残量推定装置３０は、蓄電量に応じてステージ構造が変化する電極を含む電池２０の残量を推定する装置であって、電池２０を流れる電流値をモニタする電流モニタ３１Ｂと、電池２０の電圧値をモニタする電圧モニタ３１Ａと、電流モニタ３１Ｂによりモニタされた電流値を積算するクーロンカウンタ３５と、電圧モニタ３１Ａによりモニタされた電圧値の微分値を検出する微分回路３３と、微分回路３３により検出された微分値の変曲点を利用してクーロンカウンタ３５の電流積算による累積誤差をリセットするリセット検出回路３４と、クーロンカウンタ３５の値に基づいて電池２０の残量を推定する残量推定部３６とを備える。【選択図】図５