Battery pack and battery cluster

A battery cluster, comprising a plurality of battery packs, each battery pack comprising:

• a case comprising an accommodating cavity;
• a plurality of cells spaced in the accommodating cavity, wherein each of the plurality of cells comprises a main side and a main top, main sides of adjacent cells of the plurality of cells are opposite to each other, and each main top is a face of the cell through which poles of the cell extend;
• a plurality of vapor chambers, wherein each of the plurality of vapor chambers is attached to an end of the main side closer to the main top, and the vapor chamber has at least a protruded part relative to the main top;
• a heat-dissipating member connected to the protruded part of the vapor chamber;
• and
• an air-exhausting member disposed in the accommodating cavity toward the heat-dissipating member.