| Based on the summary of research status on the basis of pure electric vehicle thermal management proposed lithium-ion battery group management’s goal is to make the battery work at optimum temperature range 20℃-40℃and uniform,beyond the temperature range may degrade battery performance or security risks. Through precise heat coupled model battery temperature is particularly important.This study is made of a pure lithium-ion batteries for electric vehicles, battery through research monomer related thermal properties and heat-producing mechanism establish battery thermal conduction differential equation, using central difference method for solving equations of three dimensional unsteady heat energy, and using MATLAB programming,70 A discharged an hour later, battery outer surface temperature And the actual measured temperature does not exceed 3 degrees centigrade. Using ANSYS to establish battery electric coupled model simulation 70 A discharge battery internal temperature field in an hour, and temperature difference of no more than 2 degrees centigrade. This model from heat, convection coefficient, housing material temperature in aspects of change, rational selection of analysis shows that three factors and effective combinations for cells of heat dissipation, Radiating surface is the most influential.Using batteries monomer maximum temperatures average below the minimum of a function, ANSYS optimum design and parametric programming language module APDL The batteries monomer structure is optimized, the result shows 6×2 Structural arrangement of the heat sink is the best, is the maximum temperature of battery pack 41.2 ℃ Reduced to 31.3 ℃.Structure analysis using this kind of harsh working conditions ambient temperature 40℃ battery pack heat, temperatures close to the upper limit of the temperature of the battery box, for sustained high power charging and discharging of pure electric vehicles, forced cooling must be carried out. |
PDF Full Text Request