七氟丙烷对磷酸铁锂储能电池的灭火效果

Fire extinguishing effect of heptafluoropropane on lithium iron phosphate energy storage battery

以磷酸铁锂储能电池为实验对象,研究了自由膨胀、夹板限定膨胀的空间条件下,七氟丙烷灭磷酸铁锂储能电池火灾过程中温度、电压的变化,分析灭火效果。结果表明,对于自由膨胀的电池火灾,七氟丙烷可以有效终止其热失控反应;对于膨胀受限的电池,电池本身热失控过程更剧烈,灭火后持续升温时间更长,电池出现第二次热失控甚至出现复燃现象。在实际应用中,应当综合考虑安全性以及成本问题,给电池设置适当的膨胀空间,七氟丙烷灭火剂也应尽早释放。

Take Lithium iron phosphate energy storage battery as the experimental object,the fire extinguishing effect of heptafluo-ropropane on lithium iron phosphate battery was studied under the space condition of free expansion and limited expansion by splint.The change of temperature and voltage in the fire-extinguishing process of heptafluoropropane on lithium iron phosphate energy storage battery fire were studied and the fire-extinguishing effect of it was analyzed.The results showed that for free-expanding battery fires,heptafluoropropane can stop its thermal runaway reac-tioneffectively.For the battery with limited expansion,the thermal runaway process of the battery itself is more intense,and the temperature keeps rising for a longer time after extinguishing the fire.The second thermal runaway or even reburns of the battery happens.In practical application,safety and cost should be taken into consideration comprehensively to set up appropriate expansion space for the battery,and the fire-extinguishing agent of heptafluo-ropropane should be released as soon as possible.