The present application relates to a battery pack. The battery pack comprises: two or more battery modules, each of the battery modules comprising a plurality of battery cells which are stacked in sequence, wherein each of the battery cells is provided with an explosion-proof valve; the battery pack further comprising a thermal alarm device and a battery management system, wherein the thermal alarm device is arranged corresponding to the explosion-proof valve; the thermal alarm device and the battery management system are connected to form a circuit; and a break of the circuit can be caused when the explosion-proof valve is exploded. The present application provides the thermal alarm device, and when thermal runaway occurs in the battery module, a circuit break is formed between the thermal alarm device and the battery management system, thus the thermal runaway status of the battery pack can be accurately reflected.