US 12,415,424 B2
Method for analyzing the condition of a traction battery, and motor vehicle
Ralf Pfennigwerth, Lehre (DE); Christian Wick, Cremlingen (DE); and Gerd Stoehr, Wesendorf (DE)
Assigned to Volkswagen Aktiengesellschaft, Wolfsburg (DE)
Filed by Volkswagen Aktiengesellschaft, Wolfsburg (DE)
Filed on Jun. 9, 2023, as Appl. No. 18/208,047.
Claims priority of application No. 10 2022 205 892.5 (DE), filed on Jun. 10, 2022.
Prior Publication US 2023/0398873 A1, Dec. 14, 2023
Int. Cl. B60L 3/00 (2019.01); B60L 7/10 (2006.01); B60L 58/16 (2019.01)
CPC B60L 3/0046 (2013.01) [B60L 7/10 (2013.01); B60L 58/16 (2019.02); B60L 2240/545 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for analyzing a condition of a traction battery of a motor vehicle, the motor vehicle comprising an electric or hybrid drive system with an electric motor to drive the motor vehicle, power electronics to drive the electric motor, a battery management system with a monitoring device for monitoring the traction battery, and the traction battery, the method comprising:
performing impedance spectroscopy on the traction battery with an alternating current across multiple alternating current frequencies, the alternating current for performing the impedance spectroscopy being supplied to the traction battery by the power electronics that drives the electric motor; and
determining at least one battery parameter of the traction battery based on the impedance spectroscopy performed,
wherein the method is carried out while the motor vehicle is in motion, and
wherein the power electronics provides another alternating current to the electric motor to energize the electric motor simultaneously while providing the alternating current to the traction battery for performing the impedance spectroscopy, so that the electric motor is energized by the power electronics to drive the motor vehicle when the impedance spectroscopy is performed on the traction battery.