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为了解决混合动力汽车用镍氢电池使用过程中温升过高,电池组各模块温差大,影响电池组的充放电性能和使用寿命的问题,根据传热学的质量、动量和能量守恒定律建立镍氢电池组的三维非稳态散热模型,采用计算流体力学方法,数值模拟分析了镍氢电池组的流场和温度场;进行了混合动力汽车行驶工况下镍氢电池组的充放电试验和温度场测量,提出了镍氢电池组散热系统的优化方案并进行了优化方案散热效果的仿真分析。结果表明:仿真分析结果与试验结果具有较好的一致性,所建流场和温度场模型是合理的;优化方案可实现镍氢电池组的良好散热,有效降低温升和电池模块之间的温差,从而满足混合动力汽车对电池组的使用要求。
In order to solve the problem that the temperature rise of hybrid Ni-MH battery is too high and the temperature difference of each module in the battery pack is large, the charge and discharge performance and service life of the battery pack are affected. According to the law of conservation of mass, momentum and energy of heat transfer, Ni-MH battery three-dimensional unsteady heat dissipation model, the use of computational fluid dynamics method, numerical simulation of the nickel-metal hydride battery flow field and temperature field; hybrid vehicle driving conditions Ni-MH battery charge and discharge test And temperature field measurement, the optimization scheme of the cooling system of the nickel-metal hydride battery pack is proposed and the simulation analysis of the heat dissipation effect of the optimization scheme is carried out. The results show that the simulation analysis results are in good agreement with the experimental results. The flow field and temperature field models are reasonable. The optimized scheme can achieve good heat dissipation in the nickel-metal hydride battery pack and effectively reduce the temperature rise and the difference between the battery modules Temperature difference, so as to meet the requirements of the hybrid car battery pack.