Research On Application Of Thermal Management Of Power Cell Based On Phase Change Materials

In terms of energy,China's oil foreign dependency has been as high as 65%,the auto industry consumes about one-third of the total alone.Development of the electric car,which promote transformation and upgrading of China's automobile industry,grab the commanding heights of urgent task,with the development of electric vehicle technology,power battery system of electric vehicle technology has also been improved.Power lithium ion battery in the case of over charging,acupuncture,collision,which cause chain exothermic reaction and thermal runaway smoke,fire and explosion.the battery thermal management system(BTMS)become more and more research focus and hot spot in recent years.The battery thermal management system(BTMS),which thermal performance can be enhanced by cooling method,however,the more be read,the more be discovered the sheer paucity of based on the combination of phase change materials and radiator pipe.In this paper,the effects of heat pipe,ambient temperature and number of heat pipes on the thermal properties of phase change materials are studied.Among them,cooling strategy is very important for thermal performance.Phase change materials have great potential in thermal management and thermal energy utilization.Heat pipe can not only make up the problem of the low thermal conductivity of the phase change material,but also connect the phase change material and the outside world as a good heat transfer medium.On the one hand,the soft power battery thermal management based on phase change materials was studied by numerical simulation,reveal the thermal power battery thermal management system under different conditions of transfer law;on the other hand,the experimental research on the coupled thermal performance of phase change materials and heat pipes,he main contents and conclusions are as follows:Lithium iron power battery,which build the numerical model battery pack based on phase change materials,The results show that:the battery thermal management module based on natural convection,whose highest temperature of the battery are mainly distributed in the positive(right)of the battery pole shoe,the highest temperature of battery pole shoe is higher than the highest temperature of the battery shell.The surface temperature of the battery shell increases as the environmental temperature and diffusion.The difference in temperature is higher than 4?,which cause serious uneven heat production.Battery thermal management module,around the battery with PCM,highesttemperature of the battery pole shoe and the battery shell decreased obviously,the cell's surface temperature difference decrease significant,the heat are mainly distributed in the central area.With the increase of ambient temperature,cooling effect is more apparent,which can control the local temperature difference on certain degree of stability.In the forced convection cooling system,when the environment temperature is higher,the heat dissipation of the power battery pack is invalid,the function of cooling and heat dissipation lose effectiveness.In the composite phase change material coupling cooling system.,in the process of high temperature,the dynamic thermal performance of PCM/copper foam/porous heat pipe module better than pure PCM.After experimental verification,change the dosage of the PCM/copper foam/porous heat pipe module,which can effect its heat transfer efficiency in different ambient temperature and different working conditions.When the coupling module of PCM/copper foam/porous heat pipe is 343.7g,which improves the thermal conductivity of phase change material,reduces the internal temperature difference and improves the heat dissipation efficiency,which is superior to other coupling modules,which has better circulating cooling performance.