Battery module

1. A battery module comprising:

a pair of end plates;

a plurality of battery cells aligned with each other between the pair of the end plates, wherein each of the battery cells has a top surface, a bottom surface located substantially opposite to the top surface, and side surfaces extending between the top surface and the bottom surface;

a top plate having a top base portion extending across the top surface of the battery cells and a top flange portion covering at least a portion of the side surfaces of the battery cells;

a bottom plate having a bottom base portion extending across the bottom surface of the battery cells and a bottom flange portion covering at least a portion of the side surfaces of the battery cells; and

a first guide portion protruding from at least one of the top flange portion or the bottom flange portion between two adjacent ones of the battery cells.

2. The battery module according to claim 1 , wherein the top flange portion and the bottom flange portion are spaced from each other.

3. The battery module according to claim 1 , wherein the top plate and the bottom plate comprise an electrically insulating material.

4. The battery module according to claim 1 , wherein the top plate and the bottom plate comprise at least one selected from the group consisting of acrylonitrile butadiene styrene (ABS), polystyrene (PS), polypropylene (PP), polyimide (PI) and polyethylene (PE).

5. The battery module according to claim 1 , wherein the top flange portion of the top plate and the bottom flange portion of the bottom plate comprise the first guide portion and a second guide portion respectively protruding toward the battery cells, wherein each of the first and second guide portions are located adjacent to one of the battery cells.

6. The battery module according to claim 1 , wherein the pair of end plates each further comprise fastening holes.

7. The battery module according to claim 6 , wherein the top plate and the bottom plate each have a fastening groove located adjacent to a corresponding one of the fastening holes.

8. The battery module according to claim 7 , wherein the fastening groove is coupled to the corresponding one of the fastening holes by a fastening member.

9. The battery module according to claim 8 , wherein the fastening member comprises a bolt or a stud.

10. The battery module according to claim 1 , further comprising a barrier located between adjacent ones of the plurality of battery cells, and wherein the bottom plate has at least one opening generally corresponding to the barrier.

11. The battery module according to claim 1 , further comprising a top cover that covers the top plate.

12. The battery module according to claim 11 , wherein at least one projection portion is provided on the top cover.

13. The battery module according to claim 12 , wherein a projection accommodating portion is provided on the bottom base portion to generally correspond to another projection portion on a top cover of another battery module.

14. The battery module according to claim 1 , further comprising a plurality of first ribs on an exterior-facing surface of a first one of the top flange portion or the bottom flange portion, wherein the first ribs are spaced from each other, and

a plurality of second ribs on an exterior-facing surface of a second one of the top flange portion or the bottom flange portion, wherein the plurality of second ribs are spaced to fit into spaces between corresponding ribs of an adjacent battery module.