Battery module having movable pressurization member

1. A battery module comprising:

a module case;

a battery cell stack mounted in the module case; and

a movable pressurization member for pressurizing the battery cell stack, wherein the movable pressurization member comprises a support member comprising a separable base plate and leg members coupled to opposite ends of the separable base plate, sliding movement members for moving the support member in directions opposite to directions in which the battery cell stack are pressurized, and a stopper member for stopping movement of the sliding movement members by stages.

2. The battery module according to claim 1 , wherein the movable pressurization member is disposed between the module case and the battery cell stack.

3. The battery module according to claim 1 , wherein each of the sliding movement members is a sliding rail comprising a fixed first rail and a movable second rail movable on the first rail, and wherein the stopper member is configured to have a concave-convex structure corresponding to the first rail and the second rail.

4. The battery module according to claim 1 , wherein each of the sliding movement members is a sliding rail comprising a fixed first rail and a movable second rail movable on the first rail, and wherein the stopper member comprises an elastic protrusion formed at the first rail and fastening grooves formed at the second rail at regular intervals such that the elastic protrusion is coupled into a corresponding one of the fastening grooves.

5. The battery module according to claim 1 , wherein the stopper member is configured to have a concave-convex structure, the stopper member being mounted in the module case, and wherein each of the sliding movement members is a wheel member coupled to a lower end of a corresponding one of the leg members, the wheel member being moveable on the stopper member having the concave-convex structure.

6. The battery module according to claim 1 , wherein each of the sliding movement members is a wheel member coupled to a lower end of a corresponding one of the leg members, and wherein the stopper member is a compression elastic member connected between the leg members coupled to the opposite ends of the separable base plate.

7. The battery module according to claim 6 , wherein the compression elastic member is a compression spring.

8. The battery module according to claim 1 , wherein the movable pressurization member releases expansion stress of battery cells constituting the battery cell stack for uniformly maintaining pressure applied to the respective battery cells.

9. The battery module according to claim 8 , wherein the pressure is maintained within a range of 30 kgf to 80 kgf.

10. The battery module according to claim 1 , wherein the battery cell stack comprises a plurality of battery cells, each of which is a pouch-shaped battery cell configured to have a structure in which an electrode laminate is mounted in a battery case together with an electrolyte in a sealed state.

11. A battery pack comprising a battery module according to claim 1 .

12. A device using a battery pack according to claim 11 as a power source.