Thermal failure behaviors and the heat efflux characteristics of Li-ion batteries triggered by thermal radiation
This paper experimentally investigated the temperature characteristics,the mass loss,the change characteristics of heat production behaviors,the spatial efflux temperature and heat flow distribution characteristics for non-contact trigger power lithium-ion batteries of radiant heater during thermal failure.Batteries of 50 Ah Li(Ni0.6Co0.2Mn0.2)O2 were taken as the research object to carry out relevant tests based on a lithium-ion battery combustion experiment platform.The results show that 2 eruptions occurred during the battery thermal runaway experiment;The battery surface maximum temperature is 489.2 ℃ the highest average temperature rise rate is 27.7 K·s-1;the maximum mass loss rate is 32.7 g·s-1;the battery body total heat release is 1.05 MJ;the highest ambient temperature is 705.3 ℃the flue gas total heat release is 6.56 MJ·m-2,and the maximum ambient temperature of efflux space is higher than the maximum temperature of battery surface.These mean that the flammable gas with high temperature and high-speed aggravate the risk of thermal runaway.These results have significances for the early warning of battery failure,the thermal runaway suppression,and the fire risk control.
new energy vehicleslithium-ion batteriesthermal runawayheat radiationheat efflux characteristics
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