Research On Energy Absorption Of CFRP Corrugated Plate And Its Application In Battery Pack Of Electric Vehicle

In recent years,the sales of electric vehicles have been increasing,and the number of electric vehicles has been increasing.Under the dual pressures of energy and environment,electric vehicles will receive more and more attention.Under the condition of existing battery technology,electric vehicle power battery pack has to have larger volume and mass in order to ensure a certain range of endurance.Moreover,when lithium-ion batteries widely used in electric vehicles are under mechanical overload such as extrusion and collision,they are prone to short-circuit failure,overheating,combustion and even explosion.For electric vehicle power battery pack,there are many dangerous conditions such as short-circuit failure,overheating,even explosion.Safety accidents are also frequently reported.On the other hand,vehicle lightweight design is of great significance to increase the endurance of electric vehicles and the life cycle of power batteries.Therefore,improving the safety and lightweight design of power battery packs is of great significance to the development and popularization of electric vehicles.Carbon Fiber Reinforced Plastic(CFRP)is a kind of high strength and low density light composite material widely used in automobile industry,which has many excellent properties.In this paper,a CFRP corrugated plate is proposed to be installed on the power battery shell to enhance the stiffness of the shell and prevent collision deformation.It can also absorb collision energy through the failure of CFRP corrugated plate,and realize lightweight design when ensuring the safety of power battery pack to the greatest extent.The main work of this paper is as follows:Firstly,CFRP corrugated plates with different structural parameters were manufactured by hand paste process,and several groups of experimental control groups were established.The deformation mode and energy absorption performance of CFRP corrugated plates with different structural parameters were obtained through quasi-static crushing experiments.The influence of structural parameters on energy absorption performance of CFRP corrugated plates was preliminarily explored.In addition to the experimental method,the finite element numerical simulation model of CFRP corrugated plate is established in LS-DYNA,and the influence of MAT 54 material model parameters on the simulation results is explored.Finally,the validity of the simulation model is verified.Secondly,the related experiments of lithium-ion battery and its mechanical properties are introduced and summarized.On the basis of existing mechanical properties experiments,the isotropic homogenization finite element model of lithium ion battery monomer was established in LS-DYNA,and the finite element model of power battery pack for electric vehicle was established.Finally,the finite element simulation model of the impact of rigid column on the side of the power battery pack is established.The CFRP corrugated plate is installed on the side of the power battery pack.The impact simulation The results showed that the battery pack reinforced by carbon fiber corrugated plate can effectively resist deformation and improve crashworthiness.