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When the first line of defense is breached (such as when the battery management system fails to cut off the charging power in a timely manner), the battery temperature rises. The temperature sensors or gas and smoke detectors in the monitoring system should promptly detect the fault and alarm, remind staff to handle the fault and eliminate the cause of fire. This is the second line of defense.
When the fault is not handled in a timely manner and the second line of defense is breached, battery burning (smoldering) cannot be avoided. At this time, the fire protection system needs to limit the burning to the faulty battery box (or box) and isolate adjacent unfired batteries and equipment to avoid the spread of the fire (isolation). Due to the extremely high temperature of lithium-ion batteries after thermal runaway, existing non aqueous fire extinguishing agents such as gas and dry powder cannot quickly reduce the battery temperature, and the fire extinguishing effect is not ideal. Therefore, setting the fire prevention goal of batteries as controlled burn down is a relatively practical solution with strong technical and economic benefits. This is the third line of defense.
If the fire control fails and expands, posing a serious threat to the safety of personnel and property, it is necessary to activate the fixed water-based fire extinguishing system installed in the vehicle or wait for the fire brigade to extinguish the fire.
Generally speaking, the first and second lines of defense are considered by battery manufacturers or electric vehicle manufacturers. As a fire protection professional, we can establish a solid third line of defense for customers and customize solutions based on the specific model specifications and performance of the battery. The components used in the solutions come from all over the world, not limited to a specific type of equipment or material.
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