Cooling Structure Design And Simulation Research Of Lithium-ion Power Battery For Pure Electric Vehicle

With the emergence of energy crisis and environmental pollution problems,traditional fuel vehicles are gradually being replaced by new energy vehicles,and in the field of new energy vehicles,electric vehicles account for most of the proportion,lithium batteries as an important source of electric vehicle power,its work performance and temperature has a close relationship,high temperature make the battery safety,be reduced,and even causes heat to get out of control;Low temperature can degrade the battery capacity and affect battery life.The use of battery thermal management technology,can effectively manage the high and low temperature and temperature consistency for power battery.So that the battery works at the most suitable operating temperature range,while ensuring the safety performance of the battery,making the battery efficiency at a high level.This paper first introduces the development background and significance of thermal management of power battery,and then puts forward the necessity of battery thermal management.The heat and heat transfer mechanism of lithium battery are studied.The temperature field distribution of lithium battery at different discharge magnification and ambient temperature is discussed from experiment and theoretical simulation,and the experimental data are compared with the simulation data to demonstrate the correctness of the theoretical modeling simulation.The effective heat dissipation methods of battery pack and battery module are studied by comparing three kinds of the thermal management forms for batteries,such as natural air cooling,forced air cooling and forced liquid cooling.The forced air cooling analysis of the battery is carried out to compare the heat dissipation effect under different air speeds,the liquid cooling analysis is carried out,the trapezoidal liquid circulation channel is designed,and the liquid cooling is compared with the air cooling to demonstrate the high efficiency of the liquid cooling.Aiming at the different types of battery modules in the battery pack,the effective battery thermal management scheme is designed respectively,and finally the battery cooling device of each module is connected to form a set of battery thermal management system for the complete battery pack.Finally,the effectiveness of the battery thermal management system is demonstrated by the theoretical simulation of the battery pack.