Battery module

1. A battery module comprising:

a secondary battery unit including a plurality of secondary batteries, the plurality of secondary batteries each including electrode terminals and a safety vent which are arranged on one side of the secondary battery unit;

a compression plate wrapping at least a portion of the secondary battery unit and compressing the secondary battery unit together; and

an insulation cover covering the electrode terminals and the safety vent, the insulation cover including a duct connected to the safety vent to guide gases exhausted from the safety vent to a first location, and a vent hole member coupled to the duct at the first location.

2. The battery module of claim 1 , further comprising a fixing cover unit positioned between the secondary battery unit and the compression plate and covering the secondary battery unit to fix positions of the plurality of secondary batteries.

3. The battery module of claim 2 , wherein the fixing cover unit comprises:

a top cover covering at least a portion of the secondary battery unit and including a first barrier separating the plurality of secondary batteries spaced in a first direction from each other;

a bottom cover covering at least a portion of the secondary battery unit opposite from the top cover and including a second barrier separating the plurality of secondary batteries spaced in the first direction from each other; and

a third barrier coupled between the top cover and the bottom cover and separating the plurality of secondary batteries spaced in a second direction from each other.

4. The battery module of claim 1 , further comprising a busbar holder positioned between the secondary battery unit and the insulation cover, coupled to the fixing cover unit, and including busbars electrically connected to the electrode terminals.

5. The battery module of claim 4 , further comprising a plurality of gaskets each coupled to a location corresponding to the safety vent while passing through the busbar holder, each of the gaskets including a plurality of gas holes corresponding to the safety vents of the plurality of secondary batteries, the plurality of gaskets connecting the duct and the safety vents of the plurality of secondary batteries arranged in the second direction.

6. The battery module of claim 4 , wherein ends of the busbar holder are coupled to ends of the fixing cover unit through bolt engagement, wherein at least one protrusions are formed on top and bottom surfaces of the fixing cover unit, and wherein ring-shaped hooking portions are formed at top and bottom ends of the busbar holder to forcibly couple the protrusions to the hooking portions.

7. The battery module of claim 6 , wherein ends of the insulation cover are coupled to ends of the fixing cover unit together with the ends of the busbar holder through bolt engagement.

8. The battery module of claim 4 , further comprising a protective circuit unit electrically connected to the secondary battery unit through the busbars.

9. The battery module of claim 1 , wherein the compression plate comprises:

an upper compression plate compressing the secondary battery unit while covering the top portion of the secondary battery unit; and

a lower compression plate combined with the upper compression plate and compressing the secondary battery unit while covering the bottom portion of the secondary battery unit,

wherein ends of the upper compression plate are bent stepwise, and ends of the lower compression plate are welded to the ends of the upper compression plate such that the ends of the lower compression plate are on interior sides of the ends of the upper compression plate.

10. The battery module of claim 1 , wherein duct comprises a duct groove connected to the safety vent and a duct cover member covering the duct groove and combined with the insulation cover.