新能源汽车锂电池热管理系统热性能分析与优化控制研究

Study on Thermal Performance Analysis and Optimal Control of the Thermal Management System for New Energy Vehicle Lithium Battery

为了提高新能源汽车锂电池的使用寿命和性能,本研究通过仿真、试验对新能源汽车锂电池的热管理系统进行了分析。首先建立了锂电池组和冷却结构的计算模型,然后设计了锂电池热管理系统,在此基础上,对锂电池热管理系统冷却结构进行了优化,最后,分析了计算模型的仿真结果和热管理系统冷却结构散热性能仿真结果。影响锂电池热管理系统散热的因素包括冷却液流量、冷却液入口温度和放电倍率。结果表明,本研究所建立的计算模型是可行的,当确定了最优结构、冷却液流量值、冷却液入口温度和放电倍率时,在最优参数下,锂电池热管理系统具有良好的冷却效果,研究结果可为新能源汽车的热管理和散热技术提供坚实的理论基础。

In order to improve the service life and performance of new-energy vehicle lithium battery,the thermal management system of new-energy vehicle lithium battery is analyzed through simulation and experiment.Firstly,the calculation model of lithium battery pack and cooling structure is established,and then the thermal management system of lithium battery is designed.On this basis,the cooling structure of lithium battery thermal management system is optimized.Finally,the simulation results of the calculation model and the heat dissipation performance of the cooling structure of the thermal management system are analyzed.Factors influencing the heat dissipation of lithium battery thermal management system including the coolant flow rate,coolant entrance temperature and discharge rate,the results show that this calculation model established in this research is feasible,when the optimal structure,coolant flow rate value,coolant entrance temperature and discharge rate are determined,under the optimal parameters,the lithium battery thermal management system has good cooling effect,and the results can provide a solid theoretical basis for the thermal management and heat dissipation technology of new energy vehicles.