舰船电磁发射LFP动力电池极限倍率充放电理论模型及温升机理研究

电磁发射是一种新型高能发射技术。近年来，采用功率型动力电池为电磁发射系统供能成为新的研究方向。磷酸铁锂电池的理论模型、充电速率是影响电磁发射高能武器能量调控、连续作战能力的重要指标。目前关于磷酸铁锂电池10C/40C以上充/放电倍率研究较少，本课题拟采用试验研究、理论分析和数值计算三种手段相结合的方法，系统研究15C/80C以上的极限倍率充放电理论模型和温升机理。通过极限倍率循环充放电试验，探索不同状态下电池的温升规律；基于Shepherd理论模型进行参数辨识，以SP+模型结合电化学理论进行降阶离散化，建立极限倍率端电压计算方法；根据端电压计算方法，结合极限倍率的温升因素和老化因素，形成耦合分析方法，建立极限倍率充放电理论模型；结合有限元计算，提出极限倍率长寿命、短时长快充策略。该研究成果将有助于揭示磷酸铁锂电池极限倍率的充放电特性，为磷酸铁锂电池在电磁发射中的应用提供理论指导和技术支持。

Electromagnetic launch is a new type of high-energy launch technology. In recent years, the use of power-type batteries to power electromagnetic launch systems has become a new research direction. The theoretical model and charging rate of lithium iron phosphate batteries are important indicators that affect the energy control and continuous combat capabilities of electromagnetic launch high-energy weapons. At present, there are few studies on the charge/discharge rate of lithium iron phosphate batteries above 10C/40C. This subject intends to use a combination of experimental research, theoretical analysis and numerical calculation to systematically study the theoretical model and temperature rise mechanism of extremely high rate charging and discharging above 15C/80C. This subject intends to use a combination of experimental research, theoretical analysis and numerical calculation to systematically study the theoretical model and temperature rise mechanism of extremely high rate charging and discharging above 15C/80C. Through the charging and discharging test, the temperature law of the battery under different conditions are explored. Based on the parameter identification of Shepherd theoretical model, combined with reduced-order discretization of SP+ model with electrochemical theory, a calculating method of terminal voltage for extremely high rate is established. According to the terminal voltage calculation method, combined with the temperature rise factors and aging factors of the extremely high rate, a coupling analysis method is formed to establish the charging and discharging theoretical model. Combined with finite element calculation, a fast charging strategy of long battery life is proposed. The research results will help to reveal the charging and discharging characteristics of the extremely high rate of LFP batteries, and provide theoretical guidance and technical support for the application of LFP batteries in electromagnetic launch technology.