Abstract: The risk of battery thermal runaway has become a bottleneck problem restricting the development of the new energy industry. In response to the emergency response problem of battery thermal runaway, this paper developed a battery module thermal runaway immersion suppression experimental platform, conducted battery thermal runaway experiments under different injection strategies, and studied the effectiveness of immersion liquid in delaying battery thermal runaway and preventing battery thermal runaway. The results showed that when the battery thermal runaway occurred, the disposal condition of filling the module box with immersion solution within 40 seconds could suppress the temperature rise of the battery, with a maximum cooling rate of 78.7 ℃/s; When the battery valve is opened and the immersion liquid is filled into the module box within 40 seconds, the maximum cooling rate can reach 17.9 ℃/s to prevent thermal runaway.

Key words: lithium batteries, thermal runaway, immersion, cooling, temperature, suppression