METHOD AND DEVICE FOR DETERMINING AN OPEN-CIRCUIT VOLTAGE PROFILE OF A VEHICLE BATTERY, DEPENDENT ON A STATE OF CHARGE

摘要

The present invention relates to a method and to a battery management system which are suitable for determining an open-circuit voltage profile (3) of a vehicle battery, dependent on a state of charge, in a vehicle. In this context, the following occur: complete discharging (S1) of the vehicle battery by vehicle-internal loads of the vehicle, sensing (S2) of a first sensed, state-of-charge-dependent voltage profile (1) during the discharging (S1) of the vehicle battery, complete charging (S3) of the vehicle battery by a charging device, sensing (S4) of a second sensed state-of-charge-dependent voltage profile (2) during the charging (S3) of the vehicle battery, and determination (S5) of the state-of-charge-dependent open-circuit voltage profile (3) by means of a weighted interpolation of the first sensed voltage profile (1) and of the second sensed voltage profile (2).

主权项

1. A method for determining an open-circuit voltage profile of a vehicle battery, dependent on a state of charge, in a vehicle, the method comprising:
completely discharging the vehicle battery by vehicle-internal loads of the vehicle, sensing a first sensed, state-of-charge-dependent voltage profile during the discharging of the vehicle battery, completely charging of the vehicle battery by a charging device, sensing a second sensed, state-of-charge-dependent voltage profile during the charging of the vehicle battery and determining the state-of-charge-dependent open-circuit voltage profile by means of a weighted interpolation of the first sensed voltage profile and the second sensed voltage profile.