Structural Analysis And Thermal Performance Research Of Battery Box Based On Finite Element Method

New energy vehicle does not burn gasoline and diesel, so there is less environment pollution compared with the traditional fuel vehicle. Its mainstream technology has been clearer after experienced a gradual exploration of the flourishing post, and realization of automotive power electrification is its overall trends.Battery box is energy supply equipment for electric vehicles. Developer must consider some mechanical performance requirements on a variety of driving conditions in the design process of battery box. Meanwhile, compared with the traditional fuel vehicle, it makes electric vehicles a large quality of its equipment that per unit weight stores less energy; therefore, the performance of the vehicle acceleration and maximum speed increase are affected.This paper completed finite element analysis of battery box and battery unit equipped on one developing pure electric vehicle provided by an automobile Co., Ltd based on workbench. Firstly, this paper established battery box and battery unit models in software Pro/E, then this paper analyzed comprehensively statics and dynamics properties of battery box and optimized the below box based on the static result by finite element analysis theory and finite element analysis software ANSYS Workbench14.5, finally, this paper researched the thermal performance of battery below box and battery unit, then this paper completed the thermal-structure coupling analysis of below box based on the thermal result of below box. The main works are as follows:(1) Built three-dimensional solid models of single cell, battery box battery unit and below box. Completed the assembly of battery unit and battery box models.(2) Imported the three-dimensional model of below box into ANSYS Workbench, then completed its statics analysis and got the equivalent stress cloud of below box. Its analysis result provided a theoretical basis for further optimized design of the below box. Compared strength analysis result of one node with theoretical calculations result using the fourth strength theory.(3) Introduced the principle of modal analysis from the perspective on the dynamics. Simplified battery box overall structure model by using software ANSYS Workbench, then analyzed the modal of it by using method of Block Lanczos and got top ten modals.(4) Improved positions that do not meet strength requirement based on the statics analysis result of below box, and completed its size optimization design. Verified and analyzed the result from the points of statics and dynamics.(5) Emulated the temperature field of a single cell surface during discharge by using software ANSYS Workbench,and analyzed the impact on the battery surface temperature from different discharge rate on certain temperature conditions, then simulated a single battery unit surface temperature field, finally, simulation calculated temperature field of the battery below box.(6) Tested the raised temperature of a single battery unit surface during discharge, then analyzed and compared with the simulation result.(7) Completed the thermal-structure coupling analysis of below box had been optimized and improved, verified that the structure meets the strength requirement or not.