Research On Cooling System Of Electric Vehicle Battery Pack Based On Air Amplifier

An electric vehicle lithium-ion battery’s uneven heat dissipation can affect the performance,reliability, and security of the battery.Air amplifier as a flow amplification tool has its advantage,this paper proposed that made air amplifier applied to the electric vehicle battery cooling system.studied the flow field characteristics of air amplifier and cooling systems centered around an air amplifier by the way of numerical simulation, including the following:(1)For battery operating characteristics and air amplifier’s technology,this paper presented the cooling systems centered around an air amplifier.Cooling systems centered around an air amplifier utilizing the Coanda effect of hydrodynamics use a small amount of highly pressurized air as a power source in order to form a high-speed, high-pressure flow of surrounding air that cools the battery effectively.(2)Set up a three-dimensional thermal model of the battery pack,and analyzed the lithium-ion battery heat transfer characteristics and the heat generating mechanism.(3)Used Fluent to simulate flow and pressure distribution of fan and air amplifier,stuyied their flow field characteristics; studied the factors affecting the amplifier outlet air flow : gas pressure, gap width, Cohen the radius of curvature of the surface of the air amplifier has a different effect on the export flow, for the air amplifier which this paper studied, when the gap width is 0.06 mm, the radius of curvature of the Coanda surface is 20 mm, increase air flow is the best.(4)Simulated and compared cooling systems centered around an fan and cooling systems centered around an air amplifier. In the same inlet flow conditions, the air amplifier cooling system has a lower highest temperature, also has better temperature uniformity than fan cooling system.(5)Simulated and studied on different structure and shape and different supplying air pressure of the cooling system,results showed that:In the same inlet flow conditions,the parallel ventilation temperature uniformity is worse and has more energy loss;trapezoidal structure of the battery box is more conducive to the battery pack heat;with the increase of supplying air pressure, the cooling effect of air amplifier cooling system also will be changed for the better.(6)Comprehensive analysis of these simulation results, optimized electric vehicle battery cooling system based on air amplifier and simulation verification: battery cabinets maximum temperature of35.2 ℃, the maximum temperature difference between the battery cell does not exceed 2 ℃, the cooling effect is good.