Battery module

1. A battery module, comprising:

a plurality of battery cells arranged in a first direction;

a circuit board arranged on upper portions of the battery cells;

a bus bar electrically connecting the battery cells and electrically connected to the circuit board; and

a pair of end plates respectively positioned at opposite ends of the battery cells in the first direction,

wherein the circuit board comprises:

a connector located at one end of the circuit board and exposed to the exterior of the battery module, wherein the connector is configured to be electrically connected to an external device, and wherein at least one of the pair of end plates is formed of a metallic material and comprises a connector grounding portion enclosing the connector, and

a connection portion connected to the connector grounding portion.

2. The battery module of claim 1 , wherein the connector grounding portion and the connection portion are formed of the same material as the end plates and are grounded to the end plates.

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

a pair of side plates coupled to the pair of end plates so as to cover short side surfaces of the battery cells; and

an upper cover coupled to the end plates and the side plates to protect the bus bar and the circuit board,

wherein the connector is exposed to the exterior of the upper cover.

4. The battery module of claim 3 , wherein the pair of end plates and the pair of side plates are formed of a metallic material and are grounded.

5. The battery module of claim 3 , wherein the upper cover is formed of an insulating material.

6. The battery module of claim 1 , wherein the connector grounding portion is located at a receptacle of an outer end of the connector and has a predetermined thickness conforming to the edge of the receptacle.

7. A battery module, comprising:

a plurality of battery cells arranged in a first direction;

a circuit board placed on upper portions of the battery cells;

a bus bar electrically connecting the battery cells and electrically connected to the circuit board;

a pair of end plates respectively positioned at opposite ends of the battery cells in the first direction;

a pair of side plates coupled to the pair of end plates so as to cover short side surfaces of the battery cells;

an upper cover coupled to the end plates and the side plates to protect the bus bar and the circuit board; and

a connector located at one end of the circuit board and exposed to the exterior of the battery module, wherein the connector is configured to be electrically connected to an external device, and wherein at least one of the pair of end plates is formed of a metallic material and comprises a connector grounding portion enclosing the connector, and a connection portion connected to the connector grounding portion; and

wherein the connector comprises a metallic connector housing located outside a receptacle of the connector, and the connector housing comprises a grounding pin connector electrically connected to one of a plurality of connecting pins of the connector.

8. The battery module of claim 7 , wherein the grounding pin of the connector is connected to the metallic material of the battery module through a conductive pattern on the surface of the circuit board.

9. The battery module of claim 7 , further comprising:

an inner housing formed of an insulating material.

10. The battery module of claim 9 , wherein the connector housing encloses the inner housing.

11. The battery module of claim 9 , wherein the connector housing encloses only a top surface of the inner housing.

12. The battery module of claim 7 , wherein the connector housing directly encloses the plurality of connecting pins.