The Swapping Traction Battery Enclosure Structure Optimization And Lightweight Design

In recent years,the state has formulated a series of positive and effective measures to promote the development of pure electric vehicles.Many enterprises recognized that can be propitious to shorten the development cycle and save the development cost which based on the traditional car platform.While the problem of the battery capacity has always hindered the development of pure electric vehicles.Based on this,the rapidly change of pure electric vehicles is the first choice for the promotion of pure electric vehicles.Swapping traction battery enclosure(the battery box)is an important part of pure electric vehicles,like the traditional auto parts,the battery box not only satisfy requirements of the dynamic characteristics such as modal and the static characteristics such as strength and stiffness but also satisfy requirements of structural optimization and overall weight reduction and so on.Therefore,it is very important to analysis the static characteristics,dynamic characteristics and structural optimization about the battery box.In this paper,create the three-dimensional model of the battery box and combining the model for analysis.Firstly,calculate the battery box model about the force when the pure electric vehicles in extreme conditions,and use computer simulation technology to analysis the battery box static characteristics that gets the stress and strain number.Secondly,for the purpose of providing the basis for structural optimization,analysis the battery box model about the modal and the vibration chart by hyperworks.Thirdly,in order to improve the first-order modal frequencies use the optimization theory and topography optimization methods to optimize the model.After that,under the condition of stress constraint to optimize the model and to get the better program which using topological optimization theory.Finally,with optimization analysis,build the battery box model again.In order to get the best combination of the type of material,strengthening rib form and material thickness,analysis the improved model about the static characteristics and dynamic characteristics by orthogonal.The type of material is aluminum alloy 5052-H3,the material thickness is 1.625 mm,and the strengthening rib form adopts longitudinal ribs arranged.Then,the stress is 177.9MPA,internal material yield strength;the maximum displacement is 5.664 mm,occurred in the middle of bottom battery box;the modal is 102.34 HZ,quality is 3.453 Kg.Compared with previous model,requirements such as stress,strain,modal,quality are met,and the quality reduce 18.75% more than the best combination.