Thermal Analysis And Thermal Management Of Lithium Iron Phosphate Battery For Energy Storage

With the rapid development of new energy,the importance of energy storage technology has become increasingly prominent,and the thermal performance of lithium-ion batteries for energy storage has also received extensive attention from researchers.Lithiumion batteries will generate a lot of heat during use.Excessive temperature will lead to problems such as reduced battery safety and shortened life.Therefore,it is necessary to establish an accurate heat generation model for lithium-ion batteries to study the heat generation and thermal management of lithium-ion batteries.In this paper,a 280 Ah lithium iron phosphate battery for energy storage is studied.The heating characteristics are investigated by numerical simulation and experimental research.On the basis of constructing the heat dissipation scheme,the heat dissipation parameters are optimized to provide theoretical guidance and scheme reference for practical application.The specific work is as follows :The test platform of lithium iron phosphate battery is built,and the voltage characteristics and temperature changes of the battery under different charge and discharge power and different ambient temperature are analyzed by charge and discharge test.The numerical model of the existing lithium iron phosphate battery is improved,and the distributed temperature is introduced by three-dimensional mapping and the model coupling is completed.After verifying the accuracy of the numerical model,the electrochemical and thermal characteristics of the battery under constant power discharge were obtained by simulation,and the detailed heat production of each part of the battery under different working conditions and the influence of cycle aging on the heat production of each part of the battery were analyzed.The lithium iron phosphate battery pack is simulated and analyzed by thermal simulation method,and the structure of the battery pack is optimized based on the heat dissipation effect,and the spacing between the batteries and the number of air inlets are improved.Furthermore,based on the optimized battery pack structure,the cooling model of the lithium iron phosphate energy storage cabinet was established.The heat dissipation structure of the energy storage cabinet was optimized from the aspects of the inlet air duct,the windshield and the deflector,and the energy storage cabinet structure with the best heat dissipation effect was obtained.In summary,this paper studies the thermal management of lithium iron phosphate battery by combining experiment and simulation,and improves the numerical model.