US 12,313,689 B2
Diagnosis method, diagnosis apparatus, and diagnosis system of battery, and non- transitory storage medium
Wataru Uno, Kanagawa (JP); Yuta Kanai, Kanagawa (JP); and Ryosuke Yagi, Kanagawa (JP)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (JP)
Filed by KABUSHIKI KAISHA TOSHIBA, Tokyo (JP)
Filed on Feb. 17, 2023, as Appl. No. 18/170,579.
Claims priority of application No. 2022-111390 (JP), filed on Jul. 11, 2022.
Prior Publication US 2024/0012060 A1, Jan. 11, 2024
Int. Cl. G01R 31/389 (2019.01); G01R 31/3842 (2019.01); G01R 31/392 (2019.01)
CPC G01R 31/389 (2019.01) [G01R 31/3842 (2019.01); G01R 31/392 (2019.01)] 14 Claims
OG exemplary drawing
 
1. A diagnosis method of a battery, comprising:
determining, based on a measurement result of a first impedance that is an impedance of the battery at a first frequency, whether an absolute value of a change ratio of the first impedance to an SOC of the battery is not more than a reference value, for each of a plurality of SOC values of the battery;
measuring, for a target SOC value for which the absolute value of the change ratio is not more than the reference value in the plurality of SOC values, a second impedance that is the impedance of the battery at a second frequency higher than the first frequency in addition to the first impedance; and
performing determination concerning a state of the battery based on measurement results of the first impedance and the second impedance for the target SOC value.