Disclosed is a battery module. The battery module comprises a plurality of parallel battery groups, a current-converging circuit board and a heat dissipation assembly, wherein each parallel battery pack comprises a plurality of single batteries and a fixed bracket; the fixed bracket comprises side walls; the side walls comprise a pair of parallel short side walls, wherein a fixed part is arranged on one short side wall, and the fixed part is positioned on the middle part of the short side wall; the current-converging circuit board also comprises a first end part current-converging board, a second end part current-converging board and a plurality of middle current-converging boards; the first end part current-converging board and the second end part current-converging board are arranged at the two ends of the battery module respectively; each middle current-converging board is positioned between adjacent two parallel battery packs separately; the heat dissipation assembly comprises a plurality of heat conducting bands and liquid-cooling boards; each heat conducting band winds the multiple single battery shells of each parallel battery pack and is connected with each single battery shell in a propping-against manner; each heat conducting band comprises a top surface; and each liquid-cooling board is fixed on the corresponding fixed part and is connected with the corresponding top surface in a propping-against manner. The battery module provided by the invention has relatively good heat dissipation performance and relatively high use safety.