基于锂离子电池温降指数的细水雾添加剂筛选方法

为对比细水雾添加剂抑制锂离子电池热失控多米诺效应的效果，提出锂离子电池火灾温降指数模型及其测试方法。利用自主设计的锂离子电池热失控实验平台开展含不同添加剂细水雾抑制多米诺效应实验，确定每种添加剂作用后的温降指数，对每种添加剂的作用机理进行分析。结果表明:加入添加剂后温降指数明显增大，表明添加剂可显著提高细水雾阻断热失控连续传播效果；无机盐类添加剂作用后抑制效果高于表面活性剂类添加剂，主要增强了细水雾的化学灭火作用；进一步对比温降指数发现，几类样品中NH₄H₂PO₄加入后细水雾抑制效果最好。利用温降指数对细水雾添加剂抑制热失控多米诺效应进行评估，为筛选细水雾添加剂灭火剂提供理论基础。 

Method for screening fine water mist additive based on temperature drop index of lithium-ion battery

In order to compare the effect of fine water mist additive on controlling thermal runaway Domino effect of lithium-ion batteries, the temperature drop index model of lithium-ion battery and its test method are proposed. The self-designed thermal runaway experiment platform of lithium-ion battery was used to conduct the Domino effect suppression experiment of fine water mist containing different additives, determine the temperature drop index after the action of each additive, and analyze the action mechanism of each additive. The results show that the temperature drop index increases obviously after adding the additive, which indicates that the additive can significantly improve the thermal uncontrolled continuous propagation effect of fine water mist. The inhibitory effect of inorganic salt additives is higher than that of surfactant additives, which mainly enhances the chemical fire extinguishing effect of fine water mist. Further comparison of the temperature drop index shows that the effect of fine water mist suppression is the best after NH₄H₂PO₄ is added. The temperature drop index was used to evaluate the thermal runaway domino effect suppression of fine water mist additive, which provides a theoretical basis for screening fine water mist additive fire extinguishing agent.