US 12,442,867 B2
Ascertaining the state of health of a vehicle battery
Wolfgang Berger, Biedermannsdorf (AT); and Nikolaus Mayerhofer, Sulz im Wienerwald (AT)
Assigned to AVILOO GMBH, Weiner Neudorf (AT)
Appl. No. 18/556,267
Filed by AVILOO GmbH, Weiner Neudorf (AT)
PCT Filed Mar. 10, 2022, PCT No. PCT/AT2022/060068
§ 371(c)(1), (2) Date Oct. 19, 2023,
PCT Pub. No. WO2022/221891, PCT Pub. Date Oct. 27, 2022.
Claims priority of application No. A50292/2021 (AT), filed on Apr. 20, 2021.
Prior Publication US 2024/0361397 A1, Oct. 31, 2024
Int. Cl. G01R 31/392 (2019.01); B60L 58/12 (2019.01); B60L 58/16 (2019.01); G01R 31/367 (2019.01); G01R 31/388 (2019.01)
CPC G01R 31/392 (2019.01) [B60L 58/12 (2019.02); B60L 58/16 (2019.02); G01R 31/367 (2019.01); G01R 31/388 (2019.01); B60L 2240/545 (2013.01); B60L 2240/547 (2013.01); B60L 2240/549 (2013.01); B60L 2240/70 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for determining a vehicle battery's state of health in an electric or hybrid vehicle, comprising the following steps:
connecting the vehicle battery to a load and determining values for predefined battery parameters, in particular the battery pack voltage, battery pack current, cell voltage, battery module temperature, and/or state of charge, preferably with the battery management system in the vehicle while the battery is in use,
sending these parameter values to a data storage unit, in particular outside the vehicle, preferably in realtime, in particular by means of a data transfer unit that can be plugged into a diagnosis socket in the vehicle, and
calculating the vehicle battery's state of health on a server connected to the data storage unit for data transfer based on the obtained battery parameter values, using a vehicle-specific battery model,
characterized in that a basic battery model in the form of an equivalent circuit model relating to the type of vehicle battery is initially used for the basis of the vehicle-specific battery model, wherein the basic battery model comprises a power source, an internal resistance, and a number of RC circuits, in particular two,
wherein the internal resistance and the RC circuits reflect the cell temperature and the state of charge,
wherein the open-circuit voltage is a function of the state of charge, and
wherein the cell temperature is determined using a thermal model based on the measured battery pack current, EC parameters, in particular the parameters for the equivalent circuit model, the battery module temperature, and the ambient temperature.