Battery module

1. A battery module comprising:

a plurality of rechargeable batteries electrically connected to one another;

an end plate arranged at an outermost rechargeable battery of the plurality of rechargeable batteries and supporting the plurality of rechargeable batteries, a side of the end plate having at least one coupling groove;

at least one elastic member at a surface of the end plate facing the outermost rechargeable battery;

a case receiving the plurality of rechargeable batteries, the case including a pair of outer walls facing each other, respective ends of the outer walls having at least one through-hole, the at least one coupling groove of the end plate corresponding to the at least one through-hole; and

at least one fastening member inserted into the at least one through-hole and the at least one coupling groove and coupling the pair of outer walls and the end plate to each other, the at least one fastening member being inserted into the at least one through-hole and the at least one coupling groove in a first direction substantially parallel to the surface of the end plate facing the outermost rechargeable battery,

wherein the at least one coupling groove does not include an internal thread, and the at least one fastening member does not include a screw thread,

wherein a repulsive force of the at least one elastic member acting in a second direction substantially perpendicular to the surface of the end plate facing the outermost rechargeable battery generates a friction force between the end plate and the at least one fastening member,

wherein the surface of the end plate facing the outermost rechargeable battery has at least one groove receiving the at least one elastic member, and

wherein one end of the elastic member is coupled to one end of the groove to be capable of being rotated.

2. The battery module of claim 1 , wherein the at least one elastic member comprises a pair of elastic members arranged symmetrically.

3. The battery module of claim 2 , wherein the pair of elastic members are arranged symmetrically with respect to a center line extending in a longitudinal direction and dividing the end plate into right and left portions.

4. The battery module of claim 2 , wherein the pair of elastic members are arranged symmetrically with respect to a center line extending in a transverse direction and dividing the end plate into upper and lower portions.

5. The battery module of claim 1 , wherein the at least one elastic member comprises a flat spring.

6. The battery module of claim 1 , wherein the at least one fastening member is made of a plastic material.

7. The battery module of claim 1 , wherein the at least one fastening member comprises:

a body inserted in the coupling groove; and

a head held close to the outside of the case.

8. The battery module of claim 1 , further comprising a cover coupled to an exterior of the case.

9. The battery module of claim 1 , further comprising:

another end plate arranged at another outermost rechargeable battery of the plurality of rechargeable batteries located at an end of the battery module opposite the outermost rechargeable battery, the another end plate supporting the plurality of rechargeable batteries; and

at least one another elastic member at a surface of the another end plate facing the another outermost rechargeable battery.

10. The battery module of claim 9 , wherein each of the at least one elastic member and the at least one another elastic member comprises a pair of elastic members arranged symmetrically with respect to a center line extending in a longitudinal direction and dividing the respective end plate into right and left portions.