Battery Module Design And Thermal Characteristics Analysis For The Electric Vehicle

The rapid development of vehicle industry pushes the continuous growth of the automobile output and ownership.However,the shortage of resource and the pollution of environment have become the problem that people have to face.Therefore,vehicle enterprises focus on the research of new energy automobiles and our country also regards it as national strategy.The pure electric vehicle(EV)has many advantages,such as zero emission and low noise.Moreover,the battery pack is one of the key technologies of EV and an excellent battery pack must be equipped with steady electric performance,high energy density and outstanding consistency.This article takes the ternary polymer Li-ion battery which is produced by an enterprise as the research object.Research the cell and the module from the thermal aspect and design the module mechanically via experiments and simulations.The staple consequences are below.(1)According to the target real size,design the several schemes of battery module.Analyze its merits and defects,and then optimize and re-design it based on the structure to determine the best one.Determine the terminal scheme after analyzing and introducing the part of the electric connection.Finally,make the sample and take it on the target vehicle to test its performance.(2)Study the mechanism of Li-ion batteries heat generation and transfer.Establish the cell physical model according to the real structure.Through the contrast between the simulation and the experiment,deduce the parameters which cannot measure directly,such as conductivity coefficient.(3)Build the model of the battery module according to the parameters of cell which are obtained in cell research.Judge the precision of the model by contrasting the results experiments and simulation in different discharge rate,and predict the temperature distribution in other discharge rate.(4)Analyze the cooling ways based on cost and efficiency and select the air cooling.Meanwhile,conclude air cooling is able to improve the thermolysis of the module through contrasting the result of air cooling and natural dissipation in different discharge rate.(5)According to the battery box sample,utilize ANSYS/FLUENT to build fluid-solid coupled model of the interior of the battery box to simulate the distribution of the temperature.Via selecting the velocity and the position of the inlet and the outlet,estimate whether the precision of the model meets the simulation requirement by comparing simulation results with experiment data.Also forecast the temperature distribution correctly in other discharge rate with the forced air cooling.