基于实现电池组串并联切换的管理系统研究

Research on management system based on realizing serial/parallel switching of battery pack

目前商用电动汽车的主要能源提供设备电池包均采用电芯并联-串联结构为电机和负载提供足够高的驱动电压和电流.而电芯的串联结构会因差异性导致其在充电时获得不同分压,进而影响电芯的使用效率和寿命.针对电池包的电芯串联结构,以提升电芯的使用效率为目标,设计了一款基于CSU38M20芯片的可实时进行串并联切换的电路智能管理系统.通过在电池组之间加入继电器作为通断开关,由微控制单元控制不同继电器,从而实现不同结构的切换.测试结果显示,基于电路智能管理系统,样品电芯采集电压误差均值为0.67%.同时,控制芯片根据采集电压可以实现电路串并联切换.该系统为均衡电芯电压及提高电芯利用率提供了新的设计思路和解决方案.

At present,the main energy supply equipment for commercial electric vehicles are battery packs designed as parallel-series structure,so that they can provide high enough driving voltage and current for the motor and load.Due to the difference of the batteries in series structure,the batteries obtain different voltages during charging,which in turn affects the using efficiency and service life of the battery itself.For improving the efficiency of the battery,a circuit intelligent management system based on CSU38M20 chip was designed to realize serial/parallel switching.By adding some relays between the battery packs as on/off switch,different relays was controlled by the micro-control unit to achieve different structure switching.The test results show that based on the circuit management system,the average voltage error of the sample battery is 0.67%.The micro controller can realize the series/parallel switching of the circuit according to the acquisition voltage.The system provides new ideas and solutions for battery equalization and battery utilization improvement.