Abstract: Abstract: A set of fire extinguishing experimental platform was set up, the rated capacity of 75 Ah ternary flexible lithium-ion battery was taken as the research object . A constant power of 1 000 W aluminum casting heating plate was used to induce thermal loss of the battery. The combustion characteristics of the battery under 50% SOC were analyzed, and the effect of 2-BTP on battery fire suppression and cooling was studied.?Compared with water, FM-200 and HFC-125 under equal working conditions, the fire extinguishing time, maximum temperature and re-ignition of different extinguishing agents were analyzed.?The experimental results show that under the set conditions, 2-BTP is the fastest to extinguish the flame within 13 s. 2-BTP not only has the fastest fire-extinguishing speed and the best cooling effect, but also can effectively inhibit the re-ignition of lithium ion battery.

Key words: Key words: 2-BTP, lithium-ion battery, combustion characteristic, fire extinguishing efficiency