A battery pack, comprising: 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 thermal alarm device comprises a plurality of fusible conductive members which are connected in series; and the conductive member is fused when the explosion-proof valve is exploded; the conductive member is strip-shaped, and the conductive member extends in a direction in which explosion-proof valves of one battery module are arranged; wherein the thermal alarm device further comprises an intermediate wire harness, a first lead-out wire harness and a second lead-out wire harness; the conductive members are connected end to end via the intermediate wire harness; and an end of a conductive member located at a head end is connected to the first lead-out wire harness, and an end of a conductive member located at a tail end is connected to the second lead-out wire harness; each of the intermediate wire harness, the first lead-out wire harness and the second lead-out wire harness have conductive terminals which are fixed with the conductive member; the thermal alarm device further comprises a fastener; wherein the conductive member is provided with a first hole; the conductive terminal is provided with a second hole; and the fastener fixes the conductive member and the conductive terminal after passing through the first hole and the second hole. 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 thermal alarm device comprises a plurality of fusible conductive members which are connected in series; and the conductive member is fused when the explosion-proof valve is exploded; the conductive member is strip-shaped, and the conductive member extends in a direction in which explosion-proof valves of one battery module are arranged; wherein the thermal alarm device further comprises an intermediate wire harness, a first lead-out wire harness and a second lead-out wire harness; the conductive members are connected end to end via the intermediate wire harness; and an end of a conductive member located at a head end is connected to the first lead-out wire harness, and an end of a conductive member located at a tail end is connected to the second lead-out wire harness; each of the intermediate wire harness, the first lead-out wire harness and the second lead-out wire harness have conductive terminals which are fixed with the conductive member; the thermal alarm device further comprises a fastener; wherein the conductive member is provided with a first hole; the conductive terminal is provided with a second hole; and the fastener fixes the conductive member and the conductive terminal after passing through the first hole and the second hole.