Battery core module

The application relates to the technical field of a battery pack, in particular to a battery core module. The battery core module comprises a substrate, a plurality of battery units, a pair of end plates, a pair of side plates and a plurality of fastening elements, wherein the pair of end plates are separately arranged on the two sides of a direction which the plurality of battery units are laminated, are close to the battery unit at the outermost part and extend along the length direction of the battery units, the end parts of the end plates in the length direction of the battery units are bent to form a pipe winding segment, the axial line direction of the pipe winding segment is the same as the height direction of the battery units, and the fastening elements are inserted into the pipe winding segment, extend towards a substrate direction in the pipe winding segment, protrude out of the pipe winding segment, and are fixed on the substrate. By arranging the pipe winding segment on the end plates, the fastening strength of the fastening elements is improved, and the battery can be reliably fixed on the substrate.