US 12,253,567 B2
Capacity degradation prediction method and prediction system
Seiichi Koketsu, Wako (JP); Shunsuke Konishi, Wako (JP); Hodaka Tsuge, Wako (JP); and Hidetoshi Utsumi, Wako (JP)
Assigned to Honda Motor Co., Ltd., Tokyo (JP)
Filed by HONDA MOTOR CO., LTD., Tokyo (JP)
Filed on Feb. 14, 2022, as Appl. No. 17/670,647.
Claims priority of application No. 2021-049343 (JP), filed on Mar. 24, 2021.
Prior Publication US 2022/0308115 A1, Sep. 29, 2022
Int. Cl. G01R 31/387 (2019.01); G01R 31/3835 (2019.01); G01R 31/392 (2019.01)
CPC G01R 31/387 (2019.01) [G01R 31/3835 (2019.01); G01R 31/392 (2019.01)] 8 Claims
OG exemplary drawing
 
1. A capacity degradation prediction method of predicting capacity degradation of a secondary battery, comprising:
performing an actual estimation process of obtaining a target-battery charge curve, represented by a current capacity and a voltage, of a target battery as a target of estimation of capacity degradation, and obtaining changes of a plurality of parameters concerning capacity degradation, based on fitting operation of fitting, to the obtained target-battery charge curve, reference data of the target battery or a battery of a same type as the target battery; and
performing a change point estimation process of identifying a degradation change point where a degradation speed of a maximum battery capacity is changed as a result of increase of a usage degree of the target battery, based on the obtained plurality of parameters, wherein
the change point estimation process comprises:
a decrease curve generation process of, for each of the plurality of parameters, generating a decrease curve represented by the change of the parameter and a decrease ratio of the maximum battery capacity;
a usage degree curve generation process of, for each of the plurality of parameters, generating a usage degree curve represented by the change of the parameter and the usage degree; and
an identification process of identifying the degradation change point based on the decrease curve and the usage degree curve obtained for each of the plurality of parameters.