Battery module

1. A battery module comprising:

a plurality of battery units, each comprising an electrode assembly and an electrode terminal electrically connected to the electrode assembly and extending through an upper surface of the respective battery unit in a first direction perpendicular to the upper surface, the plurality of battery units being arranged in a row extending in a second direction perpendicular to the first direction;

a bus bar connecting the electrode terminal of a first battery unit of the plurality of battery units and the electrode terminal of a second battery unit of the plurality of battery units; and

a position arrangement unit configured to maintain to position of the bus bar relative to the electrode terminals of the first and second battery units,

wherein the first battery unit comprises a first terminal plate connected to the electrode terminal of the first battery unit, the first terminal plate having a width in a third direction perpendicular to the first and second directions that is greater than a width in the third direction of the electrode terminal of the first battery unit such that the first terminal plate protrudes outward from the electrode terminal of the first battery unit in the third direction, the first terminal plate having a through hole through which a leading edge of the electrode terminal of the first battery unit is protruded in the first direction and exposed at an outer side of the first terminal plate facing the bus bar,

wherein the second battery unit comprises a second terminal plate connected to the electrode terminal of the second battery unit, the second terminal plate having a width in the third direction that is greater than a width in the third direction of the electrode terminal of the second battery unit such that the second terminal plate protrudes outward from the electrode terminal of the second battery unit in the third direction, the second terminal plate having a through hole through which a leading edge of the electrode terminal of the second battery unit is protruded in the first direction and exposed at an outer side of the second terminal plate facing the bus bar,

wherein the bus bar is welded to the first and second terminal plates,

wherein the position arrangement unit comprises at least one guide portion protruding from a surface of at least one terminal plate of the first and second terminal plates in the first direction and extending in the second direction along at least one side of the at least one terminal plate, and

wherein the bus bar comprises at least one portion overlapping and supported on the surface of the at least one terminal plate adjacent the at least one guide portion, the at least one guide portion extending in the second direction outside an outermost edge of the bus bar such that the at least one guide portion maintains the position of the bus bar against movement in the third direction.

2. The battery module of claim 1 , wherein the at least one guide portion comprises at least one bent portion covering at least a portion of the bus bar.

3. The battery module of claim 1 , wherein a thickness of the bus bar is substantially the same as a height of the at least one guide portion.

4. The battery module of claim 1 , wherein a thickness of the bus bar is greater than a height of the at least one guide portion.

5. The battery module of claim 4 , wherein the bus bar is welded to the at least one guide portion.

6. The battery module of claim 1 , wherein, the bus bar comprises:

a body portion comprising the at least one portion of the bus bar; and

a step portion overlapping the at least one guide portion.

7. The battery module of claim 6 , wherein the step portion is welded to the at least one guide portion.

8. The battery module of claim 1 , wherein the bus bar is welded to the at least one guide portion along at least one weld line extending in the second direction.

9. The battery module of claim 1 , wherein:

the at least one guide portion comprises:

a first guide portion protruding from a surface of the first terminal plate in the first direction and extending in the second direction along a first side of the first terminal plate; and

a second guide portion protruding from the surface of the first terminal plate in the first direction and extending in the second direction along a second side of the first terminal plate opposite the first side, and

the bus bar comprises a first portion overlapping the surface of the first terminal plate between the first and second guide portions.

10. The battery module of claim 9 , wherein at least one of the first and second guide portions comprises a bent portion covering at least a portion of the bus bar.

11. The battery module of claim 9 , wherein:

the at least one guide portion further comprises:

a third guide portion protruding from a surface of the second terminal plate in the first direction and extending in the second direction along a first side of the second terminal plate; and

a fourth guide portion protruding from the surface of the second terminal plate in the first direction and extending in the second direction along a second side of the second terminal plate opposite the first side of the second terminal plate, and

the bus bar comprises a second portion overlapping the surface of the second terminal plate between the third and fourth guide portions.

12. The battery module of claim 11 , wherein the first portion of the bus bar is welded to the surface of the first terminal plate, and the second portion of the bus bar is welded to the surface of the second terminal plate.

13. The battery module of claim 11 , wherein the first portion of the bus bar comprises a first metal, and the second portion of the bus bar comprises a second metal different from the first metal.

14. The battery module of claim 9 , wherein a width of the first portion of the bus bar is the same as a distance between the first and second guide portions.

15. The battery module of claim 1 , wherein:

the at least one guide portion comprises:

a first guide portion protruding from a surface of the first terminal plate in the first direction and extending in the second direction along a first side of the bus bar; and

a second guide portion protruding from a surface of the second terminal plate in the first direction and extending in the second direction along a second side of the bus bar opposite the first side, and

the bus bar overlaps the surfaces of the first and second terminal plates and is between the first and second guide portions.

16. The battery module of claim 15 , wherein at least one of the first and second guide portions comprises a bent portion covering at least a portion of the bus bar.

17. The battery module of claim 1 , wherein:

the at least one guide portion comprises:

a first guide portion protruding from a surface of the first terminal plate in the first direction and extending in the second direction along a side of the bus bar; and

a second guide portion protruding from a surface of the second terminal plate in the first direction and extending in the second direction along the side of the bus bar, and

the bus bar overlaps the surfaces of the first and second terminal plates, the side of the bus bar being adjacent the first and second guide portions.

18. The battery module of claim 17 , wherein at least one of the first and second guide portions comprises a bent portion covering at least a portion of the bus bar.