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A battery pack including at least one battery module including: a plurality of battery cells arranged in a direction, each of the battery cells including a vent; and a cover covering the plurality of battery cells and including a degassing cover covering the vents; and a cover plate on the degassing

A battery pack including at least one battery module including: a plurality of battery cells arranged in a direction, each of the battery cells including a vent; and a cover covering the plurality of battery cells and including a degassing cover covering the vents; and a cover plate on the degassing cover, at least a portion of the degassing cover having a rigidity less than a rigidity of the cover plate.

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1. A battery pack comprising at least one battery module comprising: a plurality of battery cells arranged in a direction, each of the battery cells comprising a vent;a cover covering the plurality of battery cells and comprising: a degassing cover covering the vents; anda cover plate on the degassi

1. A battery pack comprising at least one battery module comprising: a plurality of battery cells arranged in a direction, each of the battery cells comprising a vent;a cover covering the plurality of battery cells and comprising: a degassing cover covering the vents; anda cover plate on the degassing cover,wherein at least a portion of the degassing cover has a rigidity less than a rigidity of the cover plate; anda bus bar cover covering terminals of the battery cells and bus bars connecting the terminals, the bus bar cover having a rigidity greater than the rigidity of the cover plate,wherein the cover plate is fastened to the bus bar cover,wherein the battery pack further comprises a housing accommodating the at least one battery module therein,the housing enclosing the degassing cover and the cover plate. 2. The battery pack of claim 1, wherein the degassing cover has a cavity that is open on a first side facing the vents, the cavity being defined on a second side opposite the first side by a part of the degassing cover having a rigidity less than the rigidity of the cover plate. 3. The battery pack of claim 2, wherein the cavity is adapted to receive gas discharged from the vents. 4. The battery pack of claim 1, further comprising an insulating member on the battery cells and having a plurality of openings corresponding to the vents, wherein the degassing cover contacts the insulating member. 5. The battery pack of claim 4, wherein the degassing cover comprises a discharge portion connected to a through hole of the degassing cover and having a discharge hole. 6. The battery pack of claim 5, wherein the plurality of openings is adapted to form a gas passage from the vents to the through hole of the degassing cover. 7. The battery pack of claim 5, wherein the discharge hole comprises a pair of discharge holes that are opposite each other. 8. The battery pack of claim 1, wherein the degassing cover and the bus bar cover are integrally formed. 9. The battery pack of claim 1, further comprising a first end plate and a second end plate at opposite outermost ends of the plurality of battery cells, wherein the degassing cover comprises a first fastening portion and a second fastening portion at opposite ends of the degassing cover, the first and second fastening portions being respectively mounted to the first and second end plates. 10. The battery pack of claim 9, wherein the first end plate comprises a first protrusion coupled to the first fastening portion, and the second end plate comprises a second protrusion coupled to the second fastening portion. 11. The battery pack of claim 9, further comprising at least one side plate coupled between the first and second end plates. 12. The battery pack of claim 11, wherein the bus bar cover comprises a connecting portion fastened to the at least one side plate. 13. The battery pack of claim 1, wherein the housing includes an inlet for receiving a cooling medium into the housing, and an outlet for discharging the cooling medium from the housing. 14. The battery pack of claim 13, further comprising a ventilation fan configured to move the cooling medium from the inlet to the outlet. 15. The battery pack of claim 13, wherein gas discharged from the vents is discharged from the at least one battery module in a direction toward the outlet. 16. The battery pack of claim 1, further comprising at least one barrier between two adjacent ones of the battery cells, wherein a plurality of spacers are at a side of the at least one barrier facing a side of a corresponding one of the battery cells. 17. The battery pack of claim 1, wherein the cover plate is configured to burst such that a gas is directly discharged to an inside of the housing. 18. The battery pack of claim 1, wherein the degassing cover comprises a discharge portion connected to a through hole of the degassing cover and having a discharge hole, a gas passage being defined from the vents to an inside of the housing through the discharge hole.