Volkswagen Ag

Martin Wuensch

Gerd Wuebbeler

Clemens Elster

Steffen Seitz

Rainer Fuessler

A method for determining an ageing parameter Kof a rechargeable battery, especially a lithium rechargeable battery, featuring the steps (a) detecting an impedance Z of the rechargeable battery at different frequencies f, so that a Nyquist plot and a real part path, which plots a real part of the impedance Z against the frequency f, are obtained, determining at least one of the following SOH parameters, which can be selected from a predetermined list, establishing an SOH row vector {right arrow over (P)} from the SOH parameters and all mixed terms of the form p&#xb7;p, m=1, . . . , 11, n=1, . . . , m. The invention provides for the multiplication of the SOH row vector {right arrow over (P)} by a saved calibration vector {right arrow over (A)}, thereby obtaining the ageing parameter K.

Method for determining an ageing parameter, a state of charge parameter and a temperature of a rechargeable battery, especially a lithium rechargeable battery

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Braunschweig, Germany

Martin Wuensch