Method for Detecting Electrical Fault States in a Removable Battery Pack and System for Carrying out the Method

A system comprising:

• a removable battery pack including (i) a plurality of energy storage cells interconnected in series and/or in parallel, (ii) a multiplexer measuring apparatus configured to sequentially measure cell voltages of the energy storage cells, (iii) a first monitoring unit configured to control the multiplexer measuring apparatus, and (iv) a first electromechanical interface including a first plurality of electrical contacts;
• and
• an electrical device including a second monitoring unit and a second electromechanical interface having a second plurality of electrical contacts,
• wherein in each of the first and the second plurality of electrical contacts (i) a first electrical contact is configured as an energy supply contact that can be supplied with a first reference potential, (ii) a second electrical contact is configured as an energy supply contact that can be supplied with a second reference potential, and (iii) at least one third electrical contact is configured as a signal or data contact for the first and the second monitoring units, and
• wherein the system is configured to detect an electrical fault state of the plurality of energy storage cells, the system configured to:
• control the multiplexer measuring apparatus to sequentially measure the cell voltages using the first monitoring unit;
• and
• send a command to the first monitoring unit to control the multiplexer measuring apparatus from the second monitoring unit.