大功率锂离子动力电池组散热特性数值模拟

大功率锂离子动力电池具有较高的功率密度和能量密度，在纯电动汽车和混合动力汽车中具有很大的应用价值。本文采用数值模拟的方法，建立了大功率非均匀产热动力电池组三维模型，模拟分析了基于空气单向流动冷却和往复流动冷却的LiFePO₄动力电池组（4 × 6）的散热性能。结果表明，对于大功率电池正负极产热不均匀的情况，为了降低电池模块的局部温差，电池采用正负极交叉式排列组合是必要的；随着入口风速的增大，角度大小对散热性能的影响增大；周期较长时的往复通风方式不利于减小电池组局部温差，甚至在长时间内会增加局部温差。

Numerical Simulation Investigation on the Heat Dissipation Performance of High Power Li-on Battery Pack

Lithium ion battery has broad application prospect in EVs (Electric Vehicles) and HEVs (Hybrid Electric Vehicles) because of its high energy density and power density. The heat dissipation performance of high power LiFePO₄ battery pack (4 × 6) based on unidirectional/reciprocating air flowing was investigated through 3D numerical simulation methods. The results showed that when the heat generation between the anode and the cathode was inhomogeneous, it was necessary to arrange anodes and cathodes crosswise in order to reduce local temperature difference of the battery pack. With the increase of entrance air speed, the effect of angle size on the heat dissipation performance of battery pack enlarged. When the period was long, reciprocating ventilation was not conducive to reducing the local temperature difference of the battery pack, even increased the local temperature difference to the contrary for a long time.