Apparatus and method for testing a cell contact of battery cells of a battery module

An apparatus for testing a cell contact of battery cells of a battery module that are electrically connected in parallel via a contacting system, the apparatus comprising:

• a sensor positioning system for positioning a sensor device at a plurality of test points of the battery module, wherein the sensor positioning system is configured to move the sensor device along a longitudinal axis (X), a transverse axis (Y) orthogonal to the longitudinal axis (X), and a vertical axis (Z) orthogonal to both the longitudinal axis (X) and the transverse axis (Y);
• and
• a current generation circuit for generating a battery cell current (I), wherein the battery cell current is a discharging current from the battery cell or a charging current into the battery cell;
• wherein the sensor device includes at least one field sensor, and
• wherein the field sensor is configured to detect a field in a region of one of the plurality of test points after the sensor device is positioned at the one of the plurality of test points, which is generated by the battery cell current (I) generated with the current generation circuit, wherein the field is a magnetic field or an electric field.