Battery module, and battery pack and energy storage system including the same

1. A battery module, comprising:

a plurality of battery cells, each battery cell having a top surface, a bottom surface opposite the top surface, a first end surface and a second end surface opposite the first end surface, the plurality of battery cells stacked in a first direction;

a module case configured to accommodate the plurality of battery cells; and

at least one forming portion, the at least one forming portion comprising:

a first forming groove extending in a second direction and having a first end and a second end spaced from each other in the second direction, the first forming groove engaged with the top surface of a corresponding battery cell of the plurality of battery cells; and

a second forming groove formed at each of the first end and the second end of the first forming groove, the second grooves respectively contacting the first end surface and the second end surface of a corresponding battery cell,

wherein the module case includes first and second cases coupled to each other by hooking and having shapes corresponding to each other.

2. The battery module according to claim 1 , wherein each of the first and second cases includes:

a horizontal portion having a predetermined area; and

a vertical portion perpendicularly bent from the horizontal portion.

3. The battery module according to claim 2 , wherein the horizontal portion of the first case is coupled to the vertical portion of the second case by hooking, and

wherein the vertical portion of the first case is coupled to the horizontal portion of the second case by hooking.

4. The battery module according to claim 1 , wherein the first forming groove is provided in plural, and

wherein the first forming grooves are spaced apart from each other in the first direction.

5. The battery module according to claim 4 , wherein each of the first forming grooves contacts the top surface of a corresponding battery cell of the plurality of battery cells.

6. A battery pack, comprising:

a plurality of battery modules as defined in claim 1 ,

wherein the module case of each of the plurality of battery modules has at least one bead arranged such that facing modules cases of the plurality of battery modules form a zigzag pattern.

7. An energy storage system, comprising:

at least one battery pack as defined in claim 6 .

8. The battery module according to claim 1 , wherein the at least one forming portion is a plurality of forming portions, and

wherein a number of the plurality of forming portions equals a number of the plurality of battery cells.

9. The battery module according to claim 1 , wherein the first forming groove is a depression in the module case.

10. The battery module according to claim 9 , wherein the second forming groove is a depression in the module case, a depth of the second forming groove being greater than a depth of the first forming groove.