Patent ID: 11970079
Assignee: VOLKSWAGEN AKTIENGESELLSCHAFT
Field: Measurement (Instruments)
Classification: CPC B  G  H  Y | IPC B  G  H

Claim 9:
10. A method for determining an ageing condition of a battery that is provided to supply energy to an electric motor, comprising the following steps:
determining a curve of a current of the battery and/or a voltage of the battery,
checking the curve of the current of the battery and/or the voltage of the battery for the presence of sinusoidal curve sections with different frequencies,
if sinusoidal curve sections are ascertained, extracting the sinusoidal curve sections with different frequencies,
calculating the impedance of the battery by means of impedance spectroscopy, once a frequency spectrum that is needed for impedance spectroscopy has been determined, on the basis of the sinusoidal curve sections, and
determining the ageing condition of the battery on the basis of the calculated impedance, wherein it is possible to dispense with the additional impingement of sinusoidal oscillations by external components,
wherein the extracted sinusoidal curve sections are stored and, in this process, classified in identical or similar temperature ranges of the battery and/or in identical or similar state-of-charge ranges of the battery,
whereby the impedance spectroscopy is carried out on the basis of the classified sinusoidal curve sections.