A battery module, comprising : a plurality of battery cells stacked together; a battery box, comprising: at least two end plates ; at least two side plates , wherein one end plate is provided between adjacent side plates , a cavity of the battery box is enclosed and formed by the end plates and the side plates and the plurality of battery cells stacked together are provided in the cavity ; wherein a plurality of welding members are formed by bending an end portion of an end plate for enclosure for multiple times; and each welding member is welded to a corresponding side plate ; wherein the end portion of the end plate for enclosure is bent twice to form two welding members , and the two welding members are attached to each other; the end portion of the end plate for enclosure is bent in a direction away from the cavity of the battery box to form a first welding member , and the end portion of the end plate for enclosure is bent in the direction deviating from the adjacent side plate to form a second welding member , wherein the first welding member and the second welding member are attached to each other. a plurality of battery cells stacked together; a battery box, comprising: at least two end plates ; at least two side plates , wherein one end plate is provided between adjacent side plates , a cavity of the battery box is enclosed and formed by the end plates and the side plates and the plurality of battery cells stacked together are provided in the cavity ; wherein a plurality of welding members are formed by bending an end portion of an end plate for enclosure for multiple times; and each welding member is welded to a corresponding side plate ; wherein the end portion of the end plate for enclosure is bent twice to form two welding members , and the two welding members are attached to each other; the end portion of the end plate for enclosure is bent in a direction away from the cavity of the battery box to form a first welding member , and the end portion of the end plate for enclosure is bent in the direction deviating from the adjacent side plate to form a second welding member , wherein the first welding member and the second welding member are attached to each other. at least two end plates ; at least two side plates , wherein one end plate is provided between adjacent side plates , a cavity of the battery box is enclosed and formed by the end plates and the side plates and the plurality of battery cells stacked together are provided in the cavity ; wherein a plurality of welding members are formed by bending an end portion of an end plate for enclosure for multiple times; and each welding member is welded to a corresponding side plate ; wherein the end portion of the end plate for enclosure is bent twice to form two welding members , and the two welding members are attached to each other; the end portion of the end plate for enclosure is bent in a direction away from the cavity of the battery box to form a first welding member , and the end portion of the end plate for enclosure is bent in the direction deviating from the adjacent side plate to form a second welding member , wherein the first welding member and the second welding member are attached to each other. <EOS>