Method and apparatus for providing a relaxation model for voltage prediction during the relaxation of a device battery to determine a state of charge

Abstract

The invention relates to an at least partially computer-implemented method for determining the initial state of charge of a device battery (41) of a technical device (4) after a shutdown phase, comprising the following steps: - after detecting that the technical device (S1) has been switched off, providing (S2) the last recorded operating parameter profiles of the device battery; - modeling (S3) a terminal voltage profile and a state of charge profile for a period after the technical device has been switched off using a parameterized electrochemical battery model; - providing (S4) the terminal voltage profile and the state of charge profile in a battery control unit of the device battery; - upon detecting that the technical device has been switched on (S5), measuring (S6) a terminal voltage at the switch-on time;- Providing (S8, S9) the state of charge of the modeled state of charge profile for the switch-on time as the starting state of charge, depending on the result of a comparison of the measured terminal voltage and the modeled terminal voltage at the switch-on time.

Images