US 12,241,937 B2
Estimation device, estimation method, and computer program
Muhammad Syahid Fitri Bin Azahar, Kyoto (JP); and Yasuyuki Hamano, Kyoto (JP)
Assigned to GS Yuasa International Ltd., Kyoto (JP)
Appl. No. 17/765,597
Filed by GS Yuasa International Ltd., Kyoto (JP)
PCT Filed Oct. 2, 2020, PCT No. PCT/JP2020/037503
§ 371(c)(1), (2) Date Mar. 31, 2022,
PCT Pub. No. WO2021/066128, PCT Pub. Date Apr. 8, 2021.
Claims priority of application No. 2019-183337 (JP), filed on Oct. 3, 2019.
Prior Publication US 2022/0404420 A1, Dec. 22, 2022
Int. Cl. G01R 31/379 (2019.01); G01R 31/367 (2019.01); G01R 31/392 (2019.01)
CPC G01R 31/379 (2019.01) [G01R 31/367 (2019.01); G01R 31/392 (2019.01)] 12 Claims
OG exemplary drawing
 
1. An estimation device comprising:
a derivation unit configured to derive a derivation history based on a current and a voltage of a first lead-acid battery and a temperature of the first lead-acid battery acquired at an estimation time point;
a first specifying unit configured to specify a specific gravity of an electrolyte solution of the first lead-acid battery;
a second specifying unit configured to specify at least one degree out of: a first degree of softening of a positive electrode material; a second degree of corrosion of a positive electrode grid; a third degree of sulfation of a negative electrode; and a fourth degree of shrinkage of a negative electrode material based on the specified specific gravity, the derived derivation history, and at least one relationship selected from the group consisting of:
a first relationship, which is obtained in advance, between a first history based on a specific gravity of an electrolyte solution and a current, a voltage and a temperature of a second lead-acid battery which is different from the first lead-acid battery, and the first degree;
a second relationship, which is obtained in advance, between a second history based on a specific gravity of an electrolyte solution and a current, a voltage and a temperature of a third lead-acid battery which is different from the first lead-acid battery and the same as or different from the second lead-acid battery, and the second degree;
a third relationship, which is obtained in advance, between a third history based on a specific gravity of an electrolyte solution and a current, a voltage and a temperature of a fourth lead-acid battery which is different from the first lead-acid battery and the same as or different from the second and third lead-acid batteries, and the third degree; and
a fourth relationship, which is obtained in advance, between a fourth history based on a current, a voltage and a temperature of a fifth lead-acid battery which is different from the first lead-acid battery and the same as or different from the second, third and fourth lead-acid batteries, and the fourth degree; and
an estimation unit configured to estimate a degree of deterioration of the first lead-acid battery based on the specified at least one degree.