Method and device for adjusting model parameters of an electrochemical battery model of a device battery during a charging process

A method for adjusting a parameter of a model of a battery, including providing a temporal operating variable profile of a plurality of operating variables for a time period, and modelling a profile of one of the operating variables using the model based on an operating variable of the provided operating variable profile within the time period. The method includes determining an operating state of the battery when the modeled operating variable deviates from the corresponding operating variable by more than a threshold value during the time period. The method includes performing a charging process, wherein, in the presence of the operating state, a current pulse or a voltage pulse of a specified height and a specified duration is superimposed on a charging current or a charging voltage while a further temporal operating variable profile is captured and adjusting the parameter based on the further temporal operating variable profile.