Brief introduction of lithium battery fire protection strategy

Lithium battery fire protection needs to establish multiple lines of defense with strategic depth. In addition to the use of non-flammable or flame-retardant materials inside the battery to provide the battery with substantial safety functions, the first line of defense outside the battery is to guard against various inducements that cause the battery to overheat and ignite, such as overcharge, short circuit, collision, etc. Carry out the safety design of the electrical system according to the requirements. When the first line of defense is broken (for example, the battery management system fails to block the charging power supply in time), the temperature of the battery rises, and the temperature sensor or gas and smoke detectors in the monitoring system should promptly discover the shortcomings and give an alarm to prompt work The personnel solve the shortcomings and eliminate the cause of fire. This is the second line of defense. When the shortcomings are not resolved in time and the second line of defense is broken, the battery burns (smoldering) can no longer be guarded. At this moment, what the fire fighting system has to do is to confine the combustion to the battery box (or box) where the defect occurs (containment), and It can isolate adjacent batteries and equipment that are not on fire, and guard against fire expansion (isolaTIon). Due to the extremely high temperature of lithium batteries after thermal runaway, the existing non-aqueous life-saving agents such as gas and dry powder cannot reduce the temperature of the battery dexterously, and the purpose of life-saving is not very promising. Therefore, setting the battery fire protection policy as controlled burn-down is a more practical method, which is more technical and economical. This is the third line of defense. If the fire control fails and the fire situation expands and poses a serious threat to the safety of the personnel industry, it is necessary to launch the fixed water-based rescue system installed in the car or wait for the fire brigade to rescue. Generally speaking, the first and second lines of defense are considered by battery manufacturers or electric vehicle manufacturers. As a fire protection professional, you can establish a strong third line of defense for customers, and customize the method according to the detailed model and standard functions of the battery. The components used in the method are from all over the world, not limited to a certain type of equipment or material. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: What are the advantages of lithium battery electric vehicles compared to lead-acid battery electric vehicles