Patent ID: 8741467

Claim:
A battery pack comprising: a plurality of battery cells being positioned side-by-side; a housing substantially enclosing the plurality of battery cells, wherein the housing comprises a bottom inner surface that is substantially parallel with a longitudinal direction of the battery cells, and wherein the bottom inner surface faces peripheral side surfaces of the battery cells; a cooling air intake port and a cooling air exhaust port defined in the housing; at least one cooling air passage extending between the cooling air intake port and the cooling air exhaust port, the at least one cooling air passage being at least partially defined by the peripheral side surfaces of the battery cells and the bottom inner surface of the housing, whereby cooling air directly communicates with the peripheral side surfaces of the battery cells; and at least one air direction changer disposed within the at least one cooling air passage, the at least one air direction changer being formed on the bottom inner surface of the housing that defines at least one cooling air passage.