动力电池支撑架结构设计及散热性能分析

可再生能源的发展势必带动动力电池的发展,在促进退役动力电池循环利用方面也将取得较大成效,在动力电池发展过程中,其安全性是值得广泛关注的重点问题,为提高动力锂电池组放电时散热效率,设计电池组支撑架,采用计算机仿真的方法研究不同支撑架结构、不同工质、不同流速下18650型锂电池构成的动力电池组的热性能。通过对空气和水2种工质流体、工质流速大小、工质入口位置等参数进行组合仿真分析,结果表明,随着工质流速的增加,电池组及支撑架表面的最高温度逐渐降低,当工质流速大于10 m/s时趋于稳定;适当的工质流入口的位置可增强降温效果,在低流速状态下,空气和水分别作为冷却工质时,纵向包裹型电池支撑架比横向包裹型电池支撑架电池组中表面温度分别降低了2.64%和1.86%;在高流速状态下,空气和水分别作为冷却工质时,纵向包裹型电池支撑架比横向包裹型电池支撑架电池组中表面温度分别降低了3.15%和1.83%。动力电池支撑架结构设计可为后续电池热控制提供理论参考。

POWER BATTERY SUPPORT FRAME STRUCTURE DESIGN AND ANALYSIS OF HEAT DISSIPATION PERFORMANCE

Renewable energy development is bound to lead to the development of power battery, retired electric vehicle battery recycling promotion will also made great achievements, in the process of power battery development, its security is the key problem worthy of attention, in order to improve power lithium battery discharge when the cooling efficiency, the design of the battery racks, The thermal performance of 18650 type lithium battery with different support frame structure, different working medium and different flow rate was studied by computer simulation. The results show that the maximum temperature on the surface of battery pack and support frame decreases with the increase of working fluid flow rate, and tends to be stable when the working fluid flow rate is more than 10 m/s. The proper position of working medium inlet can enhance the cooling effect. Under the condition of low flow rate, when air and water are used as cooling medium respectively, the surface temperature of longitudinal wrapped battery support frame is 2.64% and 1.86% lower than that of transverse wrapped battery support frame battery pack. At high flow rate, when air and water were used as cooling medium, the surface temperature of the longitudinal wrapped battery support frame was 3.15% and 1.83% lower than that of the transverse wrapped battery support frame. The structure design of power battery support frame can provide theoretical reference for subsequent battery thermal control.