基于有限元分析的动力锂离子电池生热特性研究

针对电动汽车用动力锂离子电池的热安全性问题,以某11 Ah动力锂离子电池为例,进行有限元建模分析,分别对锂离子电池单体在不同充放电倍率、不同环境温度以及不同散热条件下的发热情况进行了分析.结果表明,锂电池放电倍率越高温升越高且温度分布越不均匀,良好的散热模式有助于电池温升的抑制和提高电池的热稳定性.定量化的计算仿真结果符合实际,研究结果为该类电池的建模与仿真提供了借鉴和参考,对锂电池单体的设计优化及锂电池热管理系统的研发具有指导意义.

Thermal performance characteristics of lithium-ion power battery based on finite element analysis

To research the thermal security of lithium-ion power battery used in electric vehicles, this paper takes a kind of Lithium-ion power battery with 11 Ah rated capacity as an example, and use the FEM software to conduct the finite element modeling and analysis. The effects of different discharge rates, different ambient temperature and different cooling conditions on the thermal characteristics of lithium-ion power battery are investigated. The simulation results have illustrated that the higher discharge rate leads to the more and uneven temperature distribution; better cooling modes help to suppress the temperature rise and improve the thermal stability of the battery. The quantitative calculation and simulation results match well the actual conditions. The research results provide the reference for the modeling and simulation of this kind of batteries, which has shown the guiding significance for design, optimization and battery thermal management system of lithium-on power battery monomers.