公开(公告)号：US20210190869A1

公开(公告)日：2021-06-24

申请号：US17130431

申请日：2020-12-22

申请人： GS Yuasa International Ltd.

发明人： Shoya MORISHIMA ,  Yuki NAKANISHI

IPC分类号： G01R31/379 ,  B60L58/15 ,  H01M10/48

摘要： A method for estimating a state of charge of a valve regulated lead-acid battery includes; an overcharge amount identification step of identifying an overcharge amount when the lead-acid battery is overcharged after an arbitrary reference time; an open circuit voltage acquisition step of acquiring an open circuit voltage of the lead-acid battery after the reference time; and a state-of-charge estimation step of estimating a state of charge of the lead-acid battery based on the acquired open circuit voltage and a correlation between an open circuit voltage and state of charge in which a rate of change of the state of charge with respect to the open circuit voltage is smaller as the overcharge amount from the reference time until an acquisition time of the open circuit voltage is larger.

公开(公告)号：US20210096190A1

公开(公告)日：2021-04-01

申请号：US16756910

申请日：2018-07-04

申请人： GS Yuasa International Ltd.

发明人： Toshihiro YOSHIDA ,  Yuki NAKANISHI ,  Kazuhiro SUGIE

IPC分类号： G01R31/3842 ,  H02J7/00 ,  G01R31/389 ,  G01R31/392 ,  G01K3/00 ,  H01M10/48

摘要： An energy storage system includes a lead-acid battery, a battery management unit. The battery management unit defines, based on an open voltage of the lead-acid battery, a first amount of change in a capacity of the lead-acid battery from a reference state, correlating with the open voltage of the lead-acid battery and caused by a first deterioration factor and defines, based on the first amount of change in the capacity and an amount of change in overall internal resistance of the lead-acid battery from the reference state, a second amount of change in a capacity of the lead-acid battery, not correlating with the open voltage and caused by a second deterioration factor. The battery management unit defines, based on the first and second amounts of change in the capacity, at least one of a battery capacity of the lead-acid battery or an amount of change in the battery capacity from the reference state.