BATTERY PACK

A battery pack may include a housing including a cooling plate and a center plate, the cooling plate including cooling channels and the center plate including a lower center beam, a first battery cell assembly and a second battery cell assembly that are disposed on the cooling plate, and a reinforcing part coupled to the lower center beam. In addition, each of the first and second battery cell assemblies may include a cell stack, a first cross-beam, and a second cross-beam, the first cross-beam and the second cross-beam being spaced apart from each other with the cell stack interposed therebetween. Further, a shape of the first cross-beam and a shape of the second cross-beam can be different to each other, and the first cross-beam of the second battery cell assembly can be coupled to the reinforcing part.