A battery module, characterized in that, comprising: a plurality of unit cells arranged side by side; a fixing frame, arranged to surround an outer periphery of all the unit cells and comprising two composite end plates and two side plates, wherein the composite end plates and the side plates are alternately arranged around the plurality of the unit cells and are connected to each other, wherein the composite end plate comprises: a first rigid plate having a first surface and a second surface opposite to each other in a thickness direction of the first rigid plate, and comprising a first end portion, a first intermediate portion and a second end portion continuously distributed in a length direction of the first rigid plate; and a second rigid plate comprising a first free end, a second intermediate portion and a second free end continuously distributed in the length direction, wherein the first rigid plate and the second rigid plate are made of different materials, the first rigid plate is made of a metal material or a non-metal material, and the second rigid plate is made of a metal material; the first rigid plate and the second rigid plate are arranged side by side in the thickness direction of the first rigid plate with the second intermediate portion of the second rigid plate facing the first surface of the first rigid plate, the first free end is connected to the first end portion, and the second free end is connected to the second end portion, the side plate is made of the same material as the second rigid plate, and is connected to the second rigid plate by welding, and the first free end is folded to the second surface to enclose the first end portion, and the second free end is folded to the second surface to enclose the second end portion. a plurality of unit cells arranged side by side; a fixing frame, arranged to surround an outer periphery of all the unit cells and comprising two composite end plates and two side plates, wherein the composite end plates and the side plates are alternately arranged around the plurality of the unit cells and are connected to each other, wherein the composite end plate comprises: a first rigid plate having a first surface and a second surface opposite to each other in a thickness direction of the first rigid plate, and comprising a first end portion, a first intermediate portion and a second end portion continuously distributed in a length direction of the first rigid plate; and a second rigid plate comprising a first free end, a second intermediate portion and a second free end continuously distributed in the length direction, a first rigid plate having a first surface and a second surface opposite to each other in a thickness direction of the first rigid plate, and comprising a first end portion, a first intermediate portion and a second end portion continuously distributed in a length direction of the first rigid plate; and a second rigid plate comprising a first free end, a second intermediate portion and a second free end continuously distributed in the length direction, wherein the first rigid plate and the second rigid plate are made of different materials, the first rigid plate is made of a metal material or a non-metal material, and the second rigid plate is made of a metal material; the first rigid plate and the second rigid plate are arranged side by side in the thickness direction of the first rigid plate with the second intermediate portion of the second rigid plate facing the first surface of the first rigid plate, the first free end is connected to the first end portion, and the second free end is connected to the second end portion, the side plate is made of the same material as the second rigid plate, and is connected to the second rigid plate by welding, and the first free end is folded to the second surface to enclose the first end portion, and the second free end is folded to the second surface to enclose the second end portion.