Electrical intrinsically safe battery module with pole-reversible output voltage, and a method for monitoring a battery module

The module (221) has a monitoring and controlling unit (230) monitoring a functional state of the module. The module operates a coupling unit by a controller and the unit in a normal operation such that power semiconductors (241, 242, 251, 252) of half bridges (240, 250) are switched on and other power semiconductors of the half bridges are switched off so that a battery module voltage at output terminals (224, 225) selectively lies in a positive or negative orientation. The power semiconductors are coupled with respective positive and negative poles (222, 223) of a battery cell circuit (226). Independent claims are also included for the following: (1) a method for monitoring a battery module (2) a battery system.