基于自适应选择主被动均衡拓扑的机载锂电池电源能量均衡方法

An energy equalization method for airborne lithium battery power supply based on adaptive selection of active and passive equalization topology

机载28 V串联蓄电池组内的不一致性会减小其能量利用率及寿命,严重时会导致飞行事故发生。本文提出了一种基于新型均衡拓扑的锂电池组能量均衡方法,以改善串联电池组的不一致性。该均衡拓扑利用结构简单的隔离型DC-DC变换器及功率电阻器实现蓄电池组内任一单体电池的“削峰”或“填谷”,相对于非集中式均衡拓扑减小了均衡元件的数量和系统体积。以荷电状态作为均衡变量,实现了机载28 V蓄电池组内各单体之间的能量快速转移。仿真及实验结果表明,所提出的新型均衡方法,相较于基于集中式DC-DC拓扑的均衡速度最高可提升13.3%,均衡后电压极差最低降低至32 mV,SOC极差低于0.4%,具有更快更好的均衡效果。

The inconsistency in airborne 28 V series battery group will reduce their energy utilization and life,which even leads to flight accident.In this article,an energy equalization method based on a new equalization topology is proposed to improve the inconsistency of airborne lithium series battery group.The equalization topology uses the isolated DC-DC converter with simple structure and resistor to realize“peak clipping”or“valley filling”of any single cell in the battery group.Compared with the non-centralized equalization topology,the number of equalization components and system volume are reduced.By using state of charge as the equalization variable,the energy transfer between cells in the airborne 28 V battery power supply is realized quickly.Compared with the centralized DC-DC topology,simulation and experimental results show that the proposed new equalization method can improve the equalization speed by 13.3%,reduce the voltage range to 32 mV and SOC range to less than 0.4%,and have faster and better equalization effect.