公开(公告)号：US20240094303A1

公开(公告)日：2024-03-21

申请号：US18524902

申请日：2023-11-30

申请人： Nuvoton Technology Corporation Japan

发明人： Keiichi FUJII ,  Hitoshi KOBAYASHI ,  Tomohiro OKACHI

IPC分类号： G01R31/392 ,  G01R31/367 ,  G01R31/382 ,  G01R31/389

CPC分类号： G01R31/392 ,  G01R31/367 ,  G01R31/382 ,  G01R31/389

摘要： A battery state estimation device includes: a first state of charge (SOC) calculator that calculates a first SOC using a first method that uses the battery model parameter of a battery; a second SOC calculator that calculates a second SOC using a second method different from the first method; an alternating-current (AC) impedance measurement unit that measures the AC impedance of the battery when the error between the first SOC and the second SOC is greater than a predetermined threshold; and a battery model parameter calculator that calculates a battery model parameter using the measured AC impedance. The first SOC calculator recalculates the first SOC using the battery model parameter calculated.