基于空气放大器的电池组冷却系统的性能研究

Study on Electric Vehicle Battery's Cooling Systems Centered Around an Air Amplifier

针对电动汽车锂离子电池组散热及温度均匀性对电池组使用性、可靠性和安全性的影响,本文以国内某汽车公司开发的纯电动汽车锂离子电池组为研究对象,基于空气放大器,根据流体力学的附壁效应,对电池组冷却系统的性能进行研究。通过用少量高压空气作为动力源,带动周围空气流动形成高压和高速气流对电池组冷却,同时利用fluent对该系统进行仿真模拟与分析。仿真结果表明,在并行通风方式下,该冷却系统电池组内的最高温度为315K,电池模块之间的最高温差为6K,系统冷却效果良好;而且随着空气放大器扩大空气流量倍数以及空气放大器数量的增加,冷却效果进一步提升;而在相同额定功率下,风扇冷却系统电池组内最高温度可达317K,电池模块之间的最高温差可达7K。该研究简单易用,冷却效果良好,具有一定的推广应用价值。

With respect to the fact that an electric vehicle lithium-ion battery′s uneven heat dissipation can affect the performance,reliability,and security of the battery,this paper made vehicle lithium-ion battery of a domestic company as the research object,cooling systemscentered around an air amplifier utilizing the Coanda effect of hydrodynamics.It used 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.It used fluent to simulate and the results showed that the maximum temperature within batteries using the air amplifier-based cooling system was 315 Kand the maximum temperature difference between individual batteries within each grouping was 6K.This shows that the cooling effect of the air amplifier-based system is good,and with the increase in the number of air amplifiers,and with an expansion to multiple air amplifiers,the cooling effect of this system can be further enhanced.Under similar conditions the maximum temperature within batteries of the fan-based cooling system is 317 Kand the maximum temperature difference between the batteries within each grouping is 7K.This system is easy to use and the cooling effect is good and has apromotion application value.