基于CFD正交试验的电芯干燥箱风速场均匀性研究

Flow Field Uniformity in Drying Box of Li-Ion Power Battery Core: A Simulation and Orthogonal Test

使用FLUENT数值仿真结合单因素试验和正交试验,研究电芯间距、进风口竖直距离、出风口竖直距离、进口风速和工作压力对电芯干燥箱内风速场均匀度的影响。单因素试验揭示了均匀度随各参数的变化规律,并为正交试验因素水平合理选择提供依据。由正交试验得到各参数不同水平的最优组合方案,以使风速场均匀度达到最大值。利用极差分析得出电芯间距为影响均匀度值的最主要因素。通过优化前后的数据对比,发现均匀度提高了21%,进一步验证了方案的合理性。

The flow field of wind in the box,dedicated to core drying of Li-ion powerbattery,was mathematically modeled and numerically simulated with software FLUENT for design optimization. The impact of the drying conditions,including but not limited to the pressure,inlet/outlet positions,air injection speed and core spacing,on the uniformity of wind flow-field was investigated in numerical simulation,single factor test and orthogonal test. The single-factor test results show that the impact of the core spacing,inlet/oulet positions,air injection speed and pressure on the uniformity could be listed in a descending order. The optimized drying conditions,derived inorthogonal test,included a core spacing of 50 mm,vertical distances of inlet/outlet of 33 mm/15 mm,an injection speed of 4m/s and a pressure of-100,000 Pa. The simulated results show that the design optimization increased the uniformity by21%.