The invention discloses a power battery module comprising a battery holding assembly, a battery pack, a power connecting piece, a power connecting line, a wiring harness buckle and a signal collecting assembly, wherein the battery holding assembly comprises a plurality of division plates, and adjacent division plates are interconnected detachably; the wiring harness buckle comprises a main body provided with a wiring groove; the signal collecting assembly comprises a substrate, a signal collecting line, a signal collecting element and a signal collecting terminal, the signal collecting line is composed of a flaky conductive metal piece paved on the substrate, the signal collecting element is arranged on the substrate and is connected with the signal collecting line, and the signal collecting terminal is arranged on the substrate and is provided with a first end connected with the signal collecting line and a second end electrically connected with the power connecting piece. By adopting the power battery module according to the embodiment of the invention, the battery holding assembly can be conveniently used for expanding the number of batteries and the connecting manner according to actual demands of clients on the power battery module.