纯电动汽车磷酸铁锂电池的热特性参数辨识和热仿真分析

Thermal Characteristic Analysis and Simulation of Lithium Iron Phosphate Battery

磷酸锂铁作为新型的高能化学电源,常被用作纯电动汽车电池。因此,需要对磷酸锂特电池的热性能进行研究。本文以某型号磷酸锂铁电池单体为研究对象。研究磷酸锂铁电池的生热和传热机制。建立电池的电化学—热耦合模型,并对电池的热物性参数进行计算,对电池的生热速率模型进行选取。应用计算得到的电池热物性参数,对磷酸锂铁电池单体进行CFD模型建立。应用非接触式热测量方式对CFD模型进行模型校核。运用FloTHERM热分析软件对磷酸锂铁电池组在不同散热条件下的温度场进行仿真,为电池组的设计和优化提供参考和指导。

As a new type of high-energy chemical power supply,lithium iron phosphate batteries are often used as power source of pure electric vehicles.Therefore,it is necessary to study the thermal performance of lithium iron phosphate batteries.A certain type of lithium iron phosphate battery cell is taken as research object in this paper to study the heat generation and transfer mechanism of lithium iron phosphate batteries.The thermo-physical parameters of the cell are calculated and the heat generation model is selected.Besides,the CFD(Computational Fluid Dynamics)model of the lithium iron phosphate battery cell is established out of the thermophysical parameters.FloTHERM is used to simulate the temperature profile of the cell under different working conditions.The temperature is also tested by non-contact temperature measurement.It provides reference and guidance for battery pack design and optimization.