Control arrangement for a high-voltage battery and method for operating such a control arrangement

A method for operating a control arrangement for a high-voltage battery in a motor vehicle, whereby the control arrangement comprises at least a high-voltage battery having an electric first connection in order to provide a first supply voltage for the motor vehicle as well as a control unit for the high-voltage battery which, in the control arrangement of the motor vehicle, is connected exclusively to the high-voltage battery via an electric second connection in order to provide a second supply voltage for the control unit, whereby the second connection comprises a switching element that can be switched by the control unit in order to establish and disconnect the second connection, the method comprising the following steps:

• a) determining a momentary state of charge of the high-voltage battery by means of the control unit;
• and
• b) if the momentary state of charge has fallen below a limit value, disconnecting the second connection.