Method for Detecting Electrical Fault States of a Removable Battery Pack and System for Carrying Out the Method

A system comprising:

• a removable battery pack including a plurality of energy storage cells, a first monitoring unit, and a first electromechanical interface having 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 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 another energy supply contact that can be supplied with a second reference potential, and (iii) a third electrical contact is configured as a signal or data contact configured to exchange data between the first and the second monitoring unit, and
• wherein the system is configured to detect electrical fault states of the removable battery pack, the system configured to:
• detect cell voltage values of the plurality of energy storage cells using the first monitoring unit,
• detect an output voltage value of the removable battery pack using the second monitoring unit,
• transmit the detected cell voltage values to the second monitoring unit,
• sum the transmitted cell voltage values with the second monitoring unit, and
• compare the summed cell voltage value with the detected output voltage value of the removable battery pack.