Battery management system, battery, motor vehicle having a battery management system, and method for monitoring a battery

A method for monitoring a battery, comprising:

• determining a state of charge;
• and
• monitoring the presence of minimum and maximum voltages,
• wherein different communication topologies operating independently of one another are used for (i) detecting the voltage values for determining the state of charge, and (ii) detecting the voltage values for monitoring the minimum and maximum voltages,
• wherein min/max measuring units are used at least for detecting the voltage values for the monitoring of the minimum and maximum voltage values, the min/max measuring units including:
• a plurality of first voltage measuring units, each of the first voltage measuring units assigned to at least one battery module of the battery, and
• a plurality of second voltage measuring units, the first or the second voltage measuring units being configured as the min/max measuring units in order to detect a minimum and a maximum voltage value of the battery cells in the battery modules assigned to the respective min/max measuring unit and to reject voltage measured values therebetween.

A battery comprising:

• a battery management system including:
• a control device having a first microcontroller arranged on a low-voltage side of the control device and a second microcontroller arranged on a high-voltage side of the control device;
• a plurality of first voltage measuring units, each of the first voltage measuring units assigned to at least one battery module of the battery;
• a first communication link configured to transmit voltage values from the first voltage measuring units to the first microcontroller;
• a plurality of second voltage measuring units;
• and
• a second communication link configured to transmit voltage values from the second voltage measuring units to the second microcontroller,
• wherein the first or the second voltage measuring units are configured as min/max measuring units in order to detect a minimum and a maximum voltage value of the battery cells in the battery modules assigned to the respective min/max measuring unit and to reject voltage measured values therebetween.