Bayerische Motoren Werke Aktiengesellschaft

Stefan Roemersperger

Jan Philipp Schmidt

Benno Schweiger

Christopher Wagner

Othmar Winterling

Tobias Thiem

A method for determining the parameters of an equivalent circuit for representation of the impedance of a lithium ion cell is provided. The equivalent circuit includes at least one RC element having an ohmic resistor R, a capacitor C, and a series resistor Rs. The series resistor Rs is determined by an impedance measurement.

Method for parameter estimation in an impedance model of a lithium ion cell

A method monitors the functional capability of the cooling system of an operating high-voltage accumulator for an electric drive unit of a motor vehicle. The method repeatedly measures the temperature of the high-voltage accumulator by use of a temperature sensor mounted on the high-voltage accumulator; checks whether the measured temperature value is above a cooling threshold temperature; determines a profile of the temperature of the high-voltage accumulator using a temporal sequence of the measured temperature values of the high-voltage accumulator which are above the cooling threshold temperature; and diagnoses that the cooling system is operating correctly if the temperature profile does not exceed a predetermined threshold.

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Munich, Germany

Stefan Roemersperger