US 12,339,326 B2
Deterioration diagnosis apparatus of assembled battery and deterioration diagnosis method of assembled battery
Kentaro Suzuki, Kariya (JP); and Koji Yamada, Kusatsu (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Aug. 18, 2022, as Appl. No. 17/890,736.
Claims priority of application No. 2021-180364 (JP), filed on Nov. 4, 2021.
Prior Publication US 2023/0132434 A1, May 4, 2023
Int. Cl. G01R 31/392 (2019.01); G01R 31/36 (2020.01); G01R 31/388 (2019.01); G01R 31/396 (2019.01); H01M 10/44 (2006.01)
CPC G01R 31/392 (2019.01) [G01R 31/3647 (2019.01); G01R 31/388 (2019.01); G01R 31/396 (2019.01); H01M 10/44 (2013.01); H01M 2220/20 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A deterioration diagnosis apparatus of an assembled battery, the deterioration diagnosis apparatus comprising at least one processor configured to:
execute discharging of each of a plurality of cells included in the assembled battery mounted on a vehicle while measuring a voltage of each of the cells; and
estimate a deterioration degree of the assembled battery using voltage data indicating a transition of a voltage of at least one of the cells from a discharging start voltage to a predetermined discharging end voltage, wherein:
the vehicle includes an internal combustion engine and a motor that executes start processing of the internal combustion engine;
the assembled battery is configured to supply power to the motor;
the at least one processor is configured to determine, during the discharging of each of the cells, whether the assembled battery becomes unable to supply power required for the start processing to the motor when the discharging is continued, and end the discharging before the assembled battery becomes unable to supply the power required for the start processing to the motor; and
the at least one processor is configured to:
end the discharging when any of a first end condition and a second end condition is satisfied, the first end condition being satisfied when voltages of all the cells included in the assembled battery reach the discharging end voltage, and the second end condition being satisfied when a determination is made that the assembled battery becomes unable to supply the power required for the start processing to the motor when the discharging is continued;
estimate, when the discharging is ended by the satisfaction of the first end condition, the deterioration degree of the assembled battery using voltage data of all the cells included in the assembled battery; and
estimate, when the discharging is ended by the satisfaction of the second end condition, the deterioration degree of the assembled battery using voltage data of a cell of which a voltage reaches the discharging end voltage before the end of the discharging.