US 12,216,171 B2
Estimation method, estimation system, and non-transitory computer-readable recording medium
Masaru Nakagomi, Tokyo (JP); Satoshi Yoshitake, Tokyo (JP); and Masahiro Kazumi, Tokyo (JP)
Assigned to Yokogawa Electric Corporation, Tokyo (JP)
Filed by Yokogawa Electric Corporation, Tokyo (JP)
Filed on Nov. 29, 2022, as Appl. No. 18/070,955.
Claims priority of application No. 2021-195710 (JP), filed on Dec. 1, 2021.
Prior Publication US 2023/0168309 A1, Jun. 1, 2023
Int. Cl. G01R 31/389 (2019.01); G01R 31/3842 (2019.01); H02J 7/00 (2006.01)
CPC G01R 31/389 (2019.01) [G01R 31/3842 (2019.01); H02J 7/0047 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An estimation method comprising:
performing, for each different degradation degree among a plurality of degradation degrees regression analysis between a first value and
a second value, wherein
the first value is related to one or more reference feature points on a differential curve of a charging-discharging curve indicating a voltage value with respect to integrated current amount of a reference storage battery, and
the second value is at least one of a capacity value of the reference storage battery and an internal resistance value of the reference storage battery; and
estimating at least one of a capacity value of a target storage battery and an internal resistance value of the target storage battery, based on a result of the regression analysis and a third value related to one or more target feature points on a differential curve of a charging-discharging curve indicating a voltage value with respect to integrated current amount of the target storage battery.