| The continuous intensification of environmental pollution has become an urgent global issue,and the development of electric vehicles is crucial to pushing the world towards a more sustainable energy future,and the development of charging infrastructure plays a key role in achieving rapid adoption of electric vehicles.However,increasing the charging rate will generate huge heat,easily reduce the service life of the charging pile,and even cause safety problems such as fire.In this paper,a phase change material and air cooling coupling cooling system is proposed.The influence of different charging power,air cooling speed and performance parameters of phase change materials on extreme temperature changes and charging time of charging modules is explored,and the parameter conditions for achieving optimal temperature control are determined.This research has important theoretical significance for solving the problem of efficient temperature control of high-power fast charging piles.The main contents and innovations of this paper are as follows:Firstly,according to the dimension parameters of the charging pile structure,the charging module device of phase change material and air cooling coupling heat dissipation is designed,and the experimental test platform is built.Different heat generation power output is realized through power box adjustment,air velocity adjustment is realized based on fan speed change,and phase change materials with different performance parameters are customized.By revealing the melting process of phase change materials,the heat transfer mechanism of latent heat utilization of phase change materials in the heat dissipation process of charging module is further clarified.The error analysis of test results in all experimental tests is given.Secondly,the influence law of phase change material and air cooling coupled thermal management system on the maximum temperature variation of the charging module is experimentally studied,and the temperature rise of the power module under different heat generation power,air flow rate,thermal conductivity of PCM,melting point temperature and filling thickness is explored.The results show that the maximum temperature of the charging module increases by 69.7 ℃ with the increase of heat generation power,and the temperature of the charging module decreases by 29.2% with the coupled phase change material.The increase of air flow rate can slow down the temperature rise,and the coupled phase change material can lower the maximum temperature of the charging module,but the effect of further slowing down the temperature rise is weakened.The thermal conductivity of the phase change material is increased to 5.0 W/(m·K),and the maximum temperature of the charging module is reduced by 8.2 ℃.The optimal temperature control of charging module can be achieved by choosing the melting point temperature of phase change material as 47.5 ℃.The filling thickness of phase change material is increased from 3.5 mm to 5.5mm,and the maximum temperature of the charging module is reduced by 4.8%.Finally,the influence law of phase change material and air cooling coupled thermal management system on the charging time of high-power fast charging source module is experimentally studied,and the influence law of different heat generation power,air flow rate,distance,thermal conductivity of phase change material,melting point temperature and filling thickness on the charging time is analyzed.The results show that the increase of heat generation power significantly reduces the charging time,and the addition of phase change material can prolong the charging time by 54%.In the small range of air flow rate,the increase of air velocity can improve the charging time of the module.When the air flow rate increases to 4.5 m/s,the coupled phase change material reduces the charging time by 110 s.By increasing the distance between air cooling and heat source,the charging time is reduced by 190 s.The thermal conductivity of the phase change material is increased from 0.2W/(m·K)to 5 W/(m·K),and the charging time is extended by 510 s.When the melting point temperature of the phase change material is 47.5 ℃,the charging time of the charging module is extended by 110 s.By increasing the filling thickness of phase change material to5.5 mm,the charging time is reduced by 690 s as compared to single air cooling. |
