| In an environment where the global economy is growing rapidly,the improvement of people’s living standard has promoted the output and quantity of automobiles.However,the rapid development of the economy will inevitably bring many problems,for example,environmental pollution and energy shortage.These will become the problems faced by countries all over the world and related organizations.They will force the car industry to pay enough attention to the problem,and when it comes to the problems that need to be solved,we should specify policies and introduce positive measures.At present,China has upgraded new energy vehicles to the national strategic level.New energy vehicles are environmentally friendly,with zero emission and low noise.Among them,the battery is one of the key technologies for electric vehicles.The main requirements of electric vehicles for power systems are higher specific energy,smaller volume,more cycle times,lower cost,and higher safety indicators.This paper made by 10 Ah soft package NCM Li-ion power battery as the research object,through preliminary test and simulation method,studied and effects of monomer,the module from the battery module heat radiation on the performance of the battery design.The main work is as follows:(1)Learned heat transfer and electrochemical knowledge,and studied the specific structure,materials and characteristics of lithium ion batteries.The relationship between the OCV-SOC of the battery at different temperatures and the influence of the temperature change on its internal resistance was studied experimentally.In order to study the heat generation conditions of the battery under different magnifications,temperature rise experiments under both adiabatic and natural heat dissipation conditions were performed,and a numerical model of the single cell was established.The physical parameters required for the simulation process were determined by consulting literature data..(2)Based on the characteristics of the lithium battery,two types of battery modules were designed,and battery module samples were prototyped.Based on the design principles of battery modules,the advantages and disadvantages of the two modules were analyzed and compared.(3)Establish the physical model of the single cell,verify the accuracy of the model by comparing the results of thermal simulation analysis under adiabatic environment,and perform the temperature rise test of the battery module under adiabatic and natural state,and check the temperature rise of the module.(4)According to the temperature distribution under the discharge of the battery module in the natural state,the water cooling structure was designed and optimized,and finally the sample was prototyped.Through experiments,the effects of changes in water flow and water temperature on the heat dissipation performance were studied,and it was found that changes in the water temperature can significantly improve the cooling effect of the battery module. |
