US 12,345,772 B2
Battery deterioration diagnosis device and battery deterioration diagnosis method
Seiji Hirai, Tokyo (JP); and Tomoki Takegami, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 18/266,284
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Feb. 2, 2021, PCT No. PCT/JP2021/003706
§ 371(c)(1), (2) Date Jun. 9, 2023,
PCT Pub. No. WO2022/168151, PCT Pub. Date Aug. 11, 2022.
Prior Publication US 2024/0044994 A1, Feb. 8, 2024
Int. Cl. G01R 31/392 (2019.01)
CPC G01R 31/392 (2019.01) 13 Claims
OG exemplary drawing
 
1. A battery deterioration diagnosis device that performs deterioration diagnosis of a battery, the device comprising:
charge/discharge circuitry to charge or discharge the battery;
charge/discharge control circuitry to control the charge/discharge circuitry in such a way that the battery is charged or discharged after a temperature of the battery rises to a predetermined diagnosis temperature;
a current-voltage detector to detect current and voltage of the battery during a period in which the battery is charged or discharged by the charge/discharge control circuitry;
differential voltage calculation circuitry to calculate a differential value of the voltage of the battery as a differential voltage on a basis of the current and voltage detected by the current-voltage detector; and
deterioration state estimation circuitry to estimate a deterioration state of the battery on a basis of a change in the differential voltage calculated by the differential voltage calculation circuitry, wherein
the higher the diagnosis temperature, the larger the current during charging or discharging of the battery by the charge/discharge control circuitry.