Electric Vehicle Battery Thermal Characteristics And Radiating Analysis

As the only energy storage component of a pure electric vehicle,the power battery determines the merits of the entire vehicle performance of the electric vehicle.Compared with other types of batteries,lithium-ion batteries have the advantages of high energy density,high power density,long cycle life,and less pollution.However,the working performance of lithium-ion batteries is closely related to the operating temperature.When the lithium-ion battery is charged and discharged,the battery generates heat.If the generated heat cannot be dispersed in time,it will accumulate in the battery body,resulting in the battery temperature being too high and affecting the battery performance.In order to ensure the normal and efficient operation of lithium ion batteries,it is necessary to have an effective battery thermal management system.This article first introduced the background of the development of electric vehicles,and then introduced the development of electric vehicles and batteries,summed up the significance and role of battery thermal management system,and analyzed the principle and thermal characteristics of lithium-ion batteries.Lithium-ion battery single-cell experiment was designed,its temperature change was studied,and the battery cell was modeled and numerically calculated.Finally,compared with the experimental results,it was verified that the established model was available.Based on reliable experimental data,the temperature variation of the lithium-ion battery pack working in the ATF hydraulic oil was simulated and analyzed.After comparing the results,it was proved that the established model was available.Based on the idea of serial heat dissipation and parallel heat dissipation,two heat dissipation systems were designed.By comparing the simulation results of two different structures,it is proved that the parallel heat dissipation is more effective than the serial heat dissipation under the same working conditions,and through simulation analysis,it can be seen that the size of the cooling liquid flow affects the temperature of the battery pack and adjusts the flow of the cooling liquid.,can control the battery temperature changes.