锂电池储能在电磁发射中的应用

Application on lithium batteries for electromagnetic launch

随着电磁发射技术的发展,储能环节成为其中不可或缺的一部分。对基本储能单元需求进行分析,以用电系统功率和能量需求为牵引,以储能系统体积重量适装性最优为目标,充分对比现有各类电池参数指标,从安全性、功率密度、能量密度和循环寿命四个方面进行考虑,确定基本储能单元类型为锂电池。面对舰上不同电磁发射设备电压、电流的需求,需要研究能够实现锂电池组快速灵活串并转换的拓扑结构。在实现电池组稳定并联之前,需保证电池组的一致性,因此需计算出电池荷电状态并进行均衡;针对短脉冲大倍率连续放电工况下荷电状态估算不准确的问题,提出以蓄电池组作为研究对象,采用动态辨识方法进行估算。由于各电池组之间存在不一致性,并联起来放电时可能导致输出电流不均衡,使得本来就处于高倍率放电的电池组超限使用,因此将提出一种电池组均流方法来解决此问题。

With the development of the electromagnetic launch technology,the energy storage system has become an important part of electromagnetic launch system.Taking the power and energy demand as the traction,and the volume weight fitness of the energy storage system as the optimal target,the demands of battery were studied.By comparing the existing kinds of batteries and taking safety,power density,energy density and cycle life into consideration,the lithium battery was selected as the candidate for electromagnetic launch system.Research on circuit topology to satisfy current and voltage demands from different equipment,the battery groups can realize serial-parallel conversion in this circuit topology.It is necessary to keep consistency between the battery groups for realizing the parallel connection of them.So the estimation of SOC (state of charge) was needed and the balance of battery groups was also needed.Aimed at solving the difficulty of SOC accuracy under the condition of short pulse,high rate and continuous discharging,the battery pack was taken as the research object and a dynamic identification method was employed to estimate the SOC of batteries.Unbalance happens as battery groups are connected in parallel,because there is discordance between battery groups,which will lead to limits for some groups.Therefore,a balance method is put forward to solve this problem.