Study on Thermal Runaway Characteristics of Soft-packing High Energy Density Ternary Li-ion Battery
In order to fully understand the conditions and consequences of thermal runaway of soft-packing high energy density ternary lithium ion battery,the runaway reaction characteristics of different types of Ni-Co-Mn ternary soft-packing lithium ion battery were investigated by battery adiabatic calorimeter.The variation features of thermal safety parameters such as initial heat release temperature of thermal runaway,trigger temperature of thermal runaway,ad-iabatic temperature rise and time to reach the maxi-mum reaction rate of batteries were obtained.The conditions and mechanism of thermal runaway in soft-packing lithium-ion batteries with high energy density were discussed,and the safety criterion to character-ize the dangerous characteristics of thermal runaway was proposed.High energy density soft-packing lithi-um-ion batteries can occur at a minimum of about 50 ℃ self-reaction heat release,120～180℃ irre-versible thermal runaway,the process produced a large amount of gas leading to bulge,rupture,the maximum temperature after the combustion of battery materials can reach 600 ℃.The key calorimetric pa-rameters and laws of the battery can provide basic da-ta and theoretical basis for the risk assessment,moni-toring and early warning and safety protection of the power battery and energy storage system.
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