Thermal runaway of large capacity lithium-iron phosphate battery pack
The surge in the new energy industry has considerably escalated the utilization of lithium-ion batteries in energy storage systems,highlighting the imperative of addressing their safety concerns.This research focuses on the thermal safety issues of lithium-ion battery modules,particularly large-capacity lithium iron phosphate(LFP)variants.We conduct an integrated experimental and numerical simulation study to examine the surface temperature characteristics of these battery modules during thermal runaway propagation.A thermal runaway simulation model is established for LFP battery modules,which investigates the impact of aerogel pads of varying thicknesses on the mitigation of thermal runaway.Furthermore,it explores the energy transfer processes during thermal runaway events.The findings indicate that aerogel pads with thicknesses of 0.7 and 1.2 mm effectively inhibit the spread of thermal runaway within the battery modules.Increasing the thickness of the aerogel pads remarkably reduces the peak temperatures reached by the protected batteries.Upon the integration of the aerogel pad,the 2#battery received insufficient heat to sustain the internal irreversible reaction,thereby halting the thermal runaway at a specific node and preventing the complete occurrence of the reaction.This study enhances the accuracy of thermal runaway simulation models,facilitates the prediction of thermal safety characteristics at the planning stage,and contributes to the overall thermal safety of the products.
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