Battery module

1. A battery module comprising:

unit batteries spaced apart from each other; and

a barrier between and contacting adjacent ones of the unit batteries,

wherein the barrier comprises:

a barrier plate;

protrusions on at least one of a front surface or a rear surface of the barrier plate, and an airflow portion defined between the protrusions, the protrusions contacting at least one of the adjacent ones of the unit batteries; and

strength reinforcing portions on the barrier plate, each extending in a direction and having a channel, the strength reinforcing portions contacting opposite periphery portions of the at least one of the adjacent ones of the unit batteries,

wherein the protrusions contact the at least one of the adjacent ones of the unit batteries between the opposite periphery portions, and wherein the protrusions are spaced apart from adjacent ones of the protrusions in the direction in which the strength reinforcing portions extend.

2. The battery module of claim 1 , wherein the strength reinforcing portions are on opposite side edges of the barrier plate, and the protrusions are between the strength reinforcing portions.

3. The battery module of claim 1 , wherein the protrusions are spaced apart from each other at intervals.

4. The battery module of claim 1 , wherein an area where the strength reinforcing portions are located is about 10-30% of an overall area of the barrier.

5. The battery module of claim 1 , wherein the protrusions protrude in a substantially identical direction to each other.

6. The battery module of claim 1 , wherein each of the protrusions has a truncated conical shape.

7. The battery module of claim 1 , wherein the channel is on the front surface and the rear surface of the barrier plate.

8. The battery module of claim 1 , wherein the strength reinforcing portions include ribs on at least one of the front surface or the rear surface of the barrier plate, the ribs extending in the direction, and wherein the channel is between the ribs.

9. The battery module of claim 8 , wherein the ribs protrude in a same direction as a direction in which the protrusions protrude.

10. The battery module of claim 9 , wherein a width of each of the ribs is substantially identical to a maximum diameter of each of the protrusions.

11. A battery module comprising unit batteries spaced apart from each other, and a barrier between and contacting adjacent ones of the unit batteries, the barrier comprising:

a first barrier comprising:

a first barrier plate;

protrusions on at least one of a front surface or a rear surface of the first barrier plate, and a first airflow portion defined between the protrusions; and

strength reinforcing portions on the first barrier plate, each extending in a direction and having a channel; and

a second barrier comprising:

a second barrier plate;

protrusions on at least one of a front surface or a rear surface of the second barrier plate, and a second airflow portion defined between the protrusions of the second barrier; and

strength reinforcing portions on the second barrier plate, each extending in a direction and having a channel,

wherein the first barrier and the second barrier face each other such that the protrusions and strength reinforcing portions of the first barrier respectively contact the protrusions and strength reinforcing portions of the second barrier.

12. The battery module of claim 11 , wherein the first barrier and the second barrier are fixedly coupled to each other by welding.

13. A battery module comprising:

unit batteries spaced apart from each other; and

a barrier between and contacting adjacent ones of the unit batteries,

wherein the barrier comprises:

a barrier plate;

protrusions on at least one of a front surface or a rear surface of the barrier plate, and an airflow portion defined between the protrusions, the protrusions contacting at least one of the adjacent ones of the unit batteries; and

strength reinforcing portions on the barrier plate, each extending in a direction and having a channel, the strength reinforcing portions contacting at least one of the adjacent ones of the unit batteries,

wherein the battery module further comprises at least one additional barrier having strength reinforcing portions, wherein areas where the strength reinforcing portions of the barriers are located gradually decrease as the respective barriers are located closer toward a center of the battery module.

14. A battery module comprising:

unit batteries spaced apart from each other; and

a barrier between and contacting adjacent ones of the unit batteries,

wherein the barrier comprises:

a barrier plate;

protrusions on at least one of a front surface or a rear surface of the barrier plate, and an airflow portion defined between the protrusions, the protrusions contacting at least one of the adjacent ones of the unit batteries; and

strength reinforcing portions on the barrier plate, each extending in a direction and having a channel, the strength reinforcing portions contacting at least one of the adjacent ones of the unit batteries,

wherein the battery module further comprises at least one additional barrier having an airflow portion, wherein the airflow portions of the barriers gradually increase in size as the respective barriers are located closer toward a center of the battery module.

15. The battery module of claim 1 , wherein the direction in which the strength reinforcing portions extend is a substantially longitudinal direction of the barrier.

16. The battery module of claim 1 , wherein the direction in which the strength reinforcing portions extend is a substantially lateral direction of the barrier.

17. The battery module of claim 1 , wherein the strength reinforcing portions and the airflow portion span an entire surface of the barrier plate.