The fire prevention pipeline in the embodiments of this application is configured to accommodate a fire prevention medium, where the fire prevention medium may be fluid, and the fluid may be liquid or gas. In a case that the pressure relief mechanism does not destroy the fire prevention pipeline, the fire prevention pipeline may not accommodate any substance. In a case that the pressure relief mechanism is actuated, the fire prevention pipeline may accommodate the fire prevention medium. For example, the fire prevention medium may be controlled to enter the fire prevention pipeline by opening and closing a valve. Alternatively, in a case that the pressure relief mechanism is not destroyed, the fire prevention pipeline may always accommodate the fire prevention medium, and the fire prevention medium may alternatively be configured to regulate temperature of the battery cell. Regulating temperature means heating or cooling a plurality of battery cells. In the case of cooling the battery cells, the fire prevention pipeline is configured to accommodate cooling fluid, to lower temperature of the plurality of battery cells. In this case, the fire prevention pipeline may also be referred to as a cooling part, a cooling system, or a cooling pipeline. The fire prevention medium accommodated by the fire prevention pipeline may also be referred to as a cooling medium or cooling fluid, and more specifically, may be referred to as a coolant or cooling gas. Optionally, the fire prevention medium may circulate, to achieve a better temperature regulation effect. Optionally, the fire prevention medium may be water, a mixture of water and ethylene glycol, air, or the like.