Simulation Study on Influence of Different Factors on Temperature of High-power Liquid Cooled Charging Cables Under Coupling of Multiple Physical Fields
To address the contradiction between significant increase in thermal effects caused by rapid energy replenishment of new energy electric vehicles and the inability to correspondingly increase the diameter of charging cables,a finite element simulation model based on electromagnetic-thermal-current multi-physics coupling is proposed to add a space cooling channel for active cooling of charging cables.The effects of cooling medium type,cooling channel structure,and coolant flow rate on the temperature and current carrying capacity of charging cable cores in overcharging scenarios are compared and analyzed without changing the cross-sectional area and environmental temperature of the cable cores.The simulation results show that the diameter of the cooling channel has the greatest impact on the temperature and current carrying capacity of the charging cable conductor,the cooling effect of liquid cooling is more significant than that of forced air cooling,and the ideal cooling medium flow rate is 0.1～0.15 m/s.When the cross-sectional area of the cable core is 70 mm2,the coolant flow rate is 0.1 m/s,the cooling medium is ethylene glycol aqueous solution,and the ratio of the cooling channel to the cross-sectional area of the cable core is 1.25,the charging cable current carrying capacity reaches 600 A,and the temperature is 49.7℃.The study provides reference for the structural optimization and design of high-power cooling charging cables in overcharging scenarios.
ultrafast chargingcharging cablecurrent carrying capacitycooling channelmulti-physics field coupling
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