With the continuous improvement in battery life requirements, the modeling, analysis and management of battery pack life become an important topic in the design of electric vehicles. A more realistic and generic modeling method coupling the electrochemical, thermal, SEI formation model of cells, fluid dynamics and the series-parallel circuit model is proposed to accurately describe the coupling relationships and quantify the inconsistencies, including temperature and current. A life model including capacity fade and reliability is established to evaluate the life of lithium-ion battery pack system (LIBPs). And a model implementation method is established to raise the computational accuracy and efficiency, then, it is validated from the perspective of electrochemical, degradation, thermal performance and coupling effect using experiments. Moreover, the multiphysical behavior and life of LIBPs in different situations are analyzed and predicted, followed by the analysis of coupling effect, inconsistency, reliability and economy. The results show the degradation rate of LIBPs first decreases and then accelerates in the whole life. Furthermore, adding series cells is uneconomical to extend the life of LIBPs. Finally, a SoH balanced management method of changing the airflow direction is proposed to extend the life of LIBPs, and the optimal strategy for different SoH inconsistency are obtained.

随着电池寿命要求的不断提高，电池组寿命的建模，分析和管理已成为电动汽车设计中的重要课题。提出了一种更现实，通用的建模方法，耦合了电池的电化学，热，SEI形成模型，流体动力学和串并联电路模型，以准确描述耦合关系并量化包括温度和电流在内的不一致性。建立了包括容量衰减和可靠性的寿命模型，以评估锂离子电池组系统（LIBP）的寿命。建立了提高模型计算精度和效率的模型实现方法，并从电化学，降解，热性能和耦合效应等方面进行了实验验证。此外，分析和预测了LIBP在不同情况下的多物理场行为和寿命，然后分析了耦合效应，不一致，可靠性和经济性。结果表明，LIBPs的降解速率在整个生命过程中先降低然后加速。此外，添加串联电池对于延长LIBP的寿命是不经济的。最后，提出了一种改变气流方向的SoH平衡管理方法，以延长LIBP的寿命，并获得针对不同SoH不一致的最优策略。添加串联电池对于延长LIBP的寿命不经济。最后，提出了一种改变气流方向的SoH平衡管理方法，以延长LIBP的寿命，并获得针对不同SoH不一致的最优策略。添加串联电池对于延长LIBP的寿命不经济。最后，提出了一种改变气流方向的SoH平衡管理方法，以延长LIBP的寿命，并获得了针对不同SoH不一致的最优策略。