US 12,442,866 B2
Estimating the state of health of a rechargeable battery
Andrea Cantadori, Parma (IT)
Assigned to MAHLE International GmbH, Stuttgart (DE)
Filed by MAHLE International GmbH, Stuttgart (DE)
Filed on Aug. 31, 2023, as Appl. No. 18/459,254.
Claims priority of application No. 22194453 (EP), filed on Sep. 7, 2022.
Prior Publication US 2024/0077546 A1, Mar. 7, 2024
Int. Cl. G01R 31/392 (2019.01); G01R 31/3835 (2019.01); H02J 7/00 (2006.01); B60L 53/62 (2019.01)
CPC G01R 31/392 (2019.01) [G01R 31/3835 (2019.01); H02J 7/0048 (2020.01); H02J 7/005 (2020.01); B60L 53/62 (2019.02)] 11 Claims
OG exemplary drawing
 
1. A method for estimating a State of Health (SoH) of a battery of a vehicle, the battery being rechargeable, the method comprising:
obtaining a first value of State of Charge of the battery;
subjecting the battery to DC power charging by connecting the battery to a fast-charging station configured to provide a DC power supply to the battery, the fast-charging station being configured to provide 150-400 A of current, 200-750 V of voltage, and greater than 50 kW of charging power;
measuring one or more of DC current and DC power provided to the battery during DC power charging by a DC logger having an inlet configured to connect to the fast-charging station and an outlet configured to connect to the battery;
after having performed the DC power charging, obtaining a second value of the State of Charge of the battery, the first value and the second value of the State of Charge of the battery being obtained from a diagnostic device configured to communicate with an electronic control unit of the vehicle;
in response to the DC current being measured, obtaining a voltage value of the battery by the diagnostic device;
computing energy provided to the battery as a function of one or more of:
measured DC current and the voltage value, and
measured DC power in a time interval of charging the battery,
the step of computing the energy being performed by the diagnostic device; and
computing the State of Health using the following formula:
SoH=(DE)/(SoCEND−SoCSTART),
where DE is the energy provided to the battery during the DC power charging, SoCSTART is the first value of SoC of the battery, and SoCEND is the second value of SoC of the battery, the step of computing the State of Health being performed by the diagnostic device.