Adaptive method for determining the power that can be maximally outputted or absorbed by a battery

A battery system, comprising:

• a battery, and
• a battery management unit connected to the battery, the battery management unit including:
• at least one current measurement unit which is configured to measure a battery current of the battery,
• a voltage measurement unit which is configured to measure a battery voltage of the battery,
• a temperature sensor which is configured to measure a temperature of the battery, and
• a controller which is connected to the current measurement unit, the voltage measurement unit, and the temperature sensor, the controller being configure to:
• determine a state variable of the battery,
• determine a power that can be provided or absorbed by the battery during a predetermined load time period on the basis of a table of power values and the state variable of the battery, the state variable of the battery acting as access parameter for the table,
• measure a load on the battery on the basis of an operational parameter of the battery,
• measure a load time period in which the load on the battery is provided,
• compare the measured load time period with a comparison region which contains the predetermined load time period, and
• implement a correction routine when the load time period is in the comparison region,
• wherein the correction routine comprises:
• at least comparing the power value from the table and the measured load,
• determining a correction value for the power value from the table on the basis of a result of the comparison of the power value from the table and the measured load, and
• correcting the power value from the table on the basis of the correction value.

A motor vehicle, comprising:

• an electric drive motor configured to move the motor vehicle, and
• a battery system connected to the electric drive motor, the battery system including:
• a battery, and
• a battery management unit connected to the battery, the battery management unit including:
• at least one current measurement unit which is configured to measure a battery current of the battery,
• a voltage measurement unit which is configured to measure a battery voltage of the battery,
• a temperature sensor which is configured to measure a temperature of the battery, and
• a controller which is connected to the current measurement unit, the voltage measurement unit, and the temperature sensor, the controller being configure to:
• determine a state variable of the battery,
• determine a power that can be provided or absorbed by the battery during a predetermined load time period on the basis of a table of power values and the state variable of the battery, the state variable of the battery acting as access parameter for the table,
• measure a load on the battery on the basis of an operational parameter of the battery,
• measure a load time period in which the load on the battery is provided,
• compare the measured load time period with a comparison region which contains the predetermined load time period, and
• implement a correction routine when the load time period is in the comparison region,
• wherein the correction routine comprises:
• at least comparing the power value from the table and the measured load,
• determining a correction value for the power value from the table on the basis of a result of the comparison of the power value from the table and the measured load, and
• correcting the power value from the table on the basis of the correction value.