Battery module

The embodiment of the invention relates to the technical field of batteries, and provides a battery module, which comprises a battery cell assembly, a battery module and a battery module, and is characterized in that the battery cell assembly comprises a plurality of battery cells arranged along a first direction and a second direction; the end plate is positioned on one side of the battery cell assembly in the first direction; the wire harness isolation plate is located at the top of the battery cell assembly, and a low-voltage connection plug-in is arranged at one end, in the first direction, of the wire harness isolation plate; the fixing device is located at the top of the end plate, the fixing device comprises a first fixing part and a second fixing part which are connected with each other, the first fixing part is fixed to the low-voltage connecting plug-in, and the low-voltage connecting plug-in and the first fixing part are detachable in the direction perpendicular to the plane where the first directi