Air-cooled battery pack

A vehicle, comprising:

• a power source, the power source providing a motive power for the vehicle;
• and
• a battery pack configured to provide electricity to the power source, the battery pack including:
• first and second battery cells;
• a first duct, the first duct having an inlet at a first end and an inclined surface at a second end opposite the first end;
• and
• a main body, the main body being connected to the first duct and encompassing the first and second battery cells,
• wherein:
• the inclined surface has a first edge and a second edge opposite the first edge, the first edge being adjacent to the battery cells, the inclined surface being inclined such that the second the second edge is closer to the inlet than the first edge is,
• a gap is between the first and second battery cells, the gap providing a passage for a heat transfer medium to flow from the first duct between the first and second battery cells,
• the first and second battery cells are stacked in a first direction, and
• the first duct includes inclined side surfaces, the inclined side surfaces each having a first edge extending in parallel with the first direction and a second edge extending in parallel with the first direction, the first edges being adjacent the battery cells, the inclined side surfaces being inclined towards each other such that the second edges are closer to each other than the first edges are.