Volkswagen Ag

Rohde and Schwarz Gmbh & Co. Kg

Gerd Wuebbeler

Thomas Reichel

Clemens Elster

Rainer Fuessler

Rolf Judaschke

Steffen Seitz

Martin Wuensch

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

A method for the error correction of a vectorial network analyzer, where a primary system calibration is initially implemented using a calibration kit. Following this, a first, secondary error correction is implemented on at least two one-port networks of the vectorial network analyzer. After this first, secondary error correction of the one-port networks of the vectorial network analyzer, a second, secondary error correction is implemented, where either two one-port networks are through-connected in an ideal manner or a measurement is implemented on a reciprocal two-port network. The corrected system-error values from the first, secondary error correction are used even in this further measurement, and overall, a high-precision, calibrated multi-port network analyzer is obtained.

Method for the secondary error correction of a multi-port network analyzer

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Berlin, Germany

Gerd Wuebbeler