Research On Structure And Thermal Performance For Fast-exchange Battery Box Of Electric Vehicle

In order to save time,improve the use efficiency of vehicles and batteries and reduce the cost of electric vehicle charging,this paper designs the fast replacement battery box in the electric vehicle switching mode according to the existing design requirements,and analyses its structure and heat dissipation energy by the finite element method.The main contents of this thesis are listed as follows:(1)Completed the design of the fast-exchange battery box structure for electric vehicles,mainly including the design of the box body,the bracket and the locking mechanism.The 3D mode of the fast-exchange battery box were establish by using Pro/E.(2)The stress and deformation of the fast-exchange battery box were simulated by using ANSYS Workbench software when the electric vehicle was driving on bumpy road braking conditions and bumpy road sharp turns conditions.(3)Simulating the fist 10 modes of fast-exchange battery box structure based on the modal analysis theory.The results show that the minimum first-order natural frequency of the fast-exchange battery box structure is higher than the external excitation frequency,so resonance does not occur.(4)Taking a square lithium-ion battery as the research object,and simplifying the structure of the power battery pack system.The computational fluid dynamics(CFD)method is used to analyze the thermal characteristics of the battery pack when the single battery is discharged at a discharge rate of 3A.The analysis results show that the temperature difference within the battery pack is 8.39°C and the temperature difference is relatively large.The heat dissipation structure of the battery box needs to be optimized and improved.(5)According to the static simulation and thermal simulation results of the battery box structure,optimizing and improving structure of the fast-exchange battery box.The static,modal,and thermal analysis of the optimized structure was re-analysis.The results show that the optimized fast-exchange battery box structure fulfill the requirements.