The invention relates to a method for ascertaining the state of health of the vehicle battery of an electric vehicle, having the following steps: - charging the vehicle battery and ascertaining specified battery parameters during the charging process, and - calculating the state of health of the vehicle battery using a vehicle-specific battery model (FM) on the basis of the transmitted battery parameters. The invention is characterized in that a basic battery model (GM), which is based on the vehicle battery type, in the form of an electric equivalent circuit model is first used as the vehicle-specific battery model (FM), wherein - the internal resistance (Ro) and RC elements (RC1, RC2) are ascertained as a function of the cell temperature and the charge state, - an open circuit voltage characteristic (OCV) is ascertained as a function of the charge state, and - the cell temperature is ascertained using a thermal model on the basis of the measured battery pack current, EC parameters, the battery module temperature, and the ambient temperature.


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    Title :

    ERMITTLUNG DES GESUNDHEITSZUSTANDS EINER FAHRZEUGBATTERIE


    Additional title:

    DETERMINING THE STATE OF HEALTH OF A VEHICLE BATTERY
    DÉTERMINATION DE L'ÉTAT DE SANTÉ D'UNE BATTERIE DE VÉHICULE


    Contributors:

    Publication date :

    2023-12-20


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    German


    Classification :

    IPC:    G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



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