| Power lithium battery with excellent performance is widely used in the field of electronic equipment,industrial products,transportation and other fields as its core component.Nowadays,more and more attention has been paid to the problem of energy and environment,the technical public relations and marketing of electric vehicles have become the focus of attention.As the power source of the power battery,which restricts the development of electric vehicle industry.However,due to the low energy density of the battery,it is necessary to form a large density of group structure in the application of electric vehicles as a power source.Due to space limitations,battery monomer after forming battery pack system must be closely arranged.This leads to thermal agglomeration of the battery by the use of monomer produced in the process,and is not easy to eliminate,this will cause the battery internal temperature is too high,may also make the temperature distribution of battery pack in disagreement.In order to solve the problem of overheating and uneven temperature in the operation of the lithium battery system,the thermal environment control method of the battery is studied in this paper.The main contents and conclusions were as follows:The paper studied and analyzed the working principle,group composition and heat production principle of lithium power battery system,the thermal effect model of lithium battery was established,and the research method of thermal environment control of power lithium battery was determined.Based on the study of the theory of uniform air supply,the design of the enhanced cooling system was completed.Using the CFD numerical simulation method,this paper studied the thermal environment control scheme of the large capacity battery system in detail,and analyzed the influence on the thermal environment of the battery pack.Three numerical models were established,including the uniform air supply module,air supply module control unit and the battery pack system equipped with a complete air supply module.In this paper,the heat transfer enhancement scheme of the battery module was studied and optimized from the angle of the air supply,the air supply parameters,the temperature field and the pressure field,the air flow organization.The results of numerical simulation of the thermal environment of the battery unit controlled by each air duct in the air supply module showed:the maximum temperature of the battery pack was 307.19 K,the lowest temperature was about 306.53 K,and the temperature difference was about 0.65 K,these were far below the control value.The results showed that the air supply module can improve the cooling effect of the battery system.On the basis of the model,it analyzed the influence of air supply parameters on the thermal environment of the battery pack and the conclusions were as follows:by increasing the air volume,better uniformity can be obtained in the battery pack,but it was difficult to reach the effect of the temperature difference between the control cells only by changing the air supply temperature.The numerical simulation of the model of the battery pack system with a complete air supply module was carried out,and the optimal airflow organization was determined.The module had a good performance in the final temperature and temperature uniformity of the battery pack system,which verified the control effect of the jet cooling module on the thermal environment of the lithium battery. |
