Influence of PCM Thermophysical Properties on Thermal Runaway Spreading of Lithium-ion Batteries
Aiming at the thermal runaway spreading problem of large lithium-ion batteries,a three-dimensional numerical calculation model for thermal runaway protection of battery packs was established by using phase change materials(PCMs)as the insulating materials of battery modules.By changing the latent heat,thickness and thermal conductivity of the PCM separator,the physical parameters of the phase change material are analysed for their influence on the thermal runaway spread of lithium-ion batteries.Calculation results show that simply changing the latent heat of the PCM spacer has little effect on the thermal runaway spreading time,while increasing the thickness of the spacer can be effectively prolonged,and when the thickness is 8mm,the protection effect required by the specification can be achieved;the latent heat of the spacer is 226kJ/kg,and the thickness of the spacer is more than 6mm,and the thermal conductivity of the thermal conductivity of the thermal runaway spreading time of the module is basically the same as that of the average of the thermal runaway spreading time of the module of 0.02W/m·K and 2W/m·K.
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