a plurality of battery cells stacked in a stacking direction; and

a plurality of fastening members, wherein each fastening member is provided with two connecting portions located on two opposite ends of the fastening member and the two connecting portions are respectively fastened to two spaced-apart battery cells that are separated by at least another battery cell along the stacking direction, and the plurality of fastening members are engaged with corresponding anchor points on a surface of the plurality of battery cells extending along the stacking direction such that the plurality of battery cells are integrated into one module by the plurality of fastening members and none of the anchor points serve as an electrode terminal of any of the plurality of battery cells; and the plurality of fastening members are engaged with corresponding anchor points on the surface of the plurality of battery cells extending along the stacking direction in at least three columns including at least one column sandwiched by another two columns in a direction perpendicular to the stacking direction of the plurality of battery cells.