Finite Element Analysis And Optimization Of A New Energy Car Battery Pack

Power battery as an important part of new energy vehicle power system,is an significant index of dynamic car battery performance.As a carrier for battery,to protect battery and secure normal work,its structure safety should not be ignored.By using the method of finite element simulation method instead of the experiment,meet regulatory requirements and do analysis of the lightweight,to ensure the correctness of finite element and experiment validation.First collect the relevant information,understand the research in and abroad.Analysis the theoretical foundation and calculation steps of battery pack finite element,and the finite element analysis and structure optimization of the battery pack,and it is concluded that the finite element analysis process.Then vehicle design key points of battery pack,according to the actual confirm the actual size of battery pack and physical parameters such as material,through the CATIA built geometrical model,the finite element model is established in Hyperworks.And based on the theory of shock and modal theory,from the analysis on structure of collision,squeezing,drop,impact and vibration five conditions,and found battery pack design defects.The input of the nonlinear acceleration curve in the first four conditions,boundary load and constraint conditions according to the physical nature of battery pack.vibration analysis base on the theory of modal analysis,and using Lanczos-QR method finish random vibration and the analysis of the dynamic stiffness.According to the regulations and internal standards,complete crash,squeeze,drop,impact,and vibration multi-objective analysis of FEA in Hyperworks.Finish conditions of loading and post-processing in Hyperworks,and output the acceleration curve,impact curve,stress nephogram,under the laws to evaluate battery pack from the static and dynamic.Through the analysis condition of vibration for the first eight order modal frequency and vibration model,will explore the battery pack when using in the motor and the pavement outside resonance vibration,random vibration analysis of frequency domain response to ensure battery pack structure reasonability.At last the topology optimization was carried out on the battery pack and free size optimization approach,on the mechanical properties of the battery pack that meet regulatory requirements under the premise of seeking material optimization and minimum distribution,in order to ensure validation of the finite element analysis,and do experimental verification.In summary,finish the the design analysis and lightweight of the battery pack in this way.