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 . <EOS>