基于自适应均衡电流的均衡控制设计

Design of Equalization Control Based on Adaptive Equalization Current

在锂电池的实际应用中,均衡电流的大小是决定均衡器均衡效率的关键因素之一,且锂电池不同荷电状态下所能接受的均衡电流并不相同。为此,提出了一种均衡电流自适应的锂电池均衡器。该均衡器基于马斯理论确定了多阶段均衡电流值计算方法,能够根据目标电池当前容量自适应调节均衡电流。介绍了均衡器结构、工作原理和控制策略,搭建了12个串联锂电池的均衡器实验平台并进行对比实验。实验结果表明所提均衡器在保证电池使用安全的前提下,提高了均衡效率,验证了所提均衡器的可行性,且结构简单,易于实现。

The size of the equalization current is one of the key factors determining equalization efficiency of equalizers in practical application of lithium batteries,and acceptable equalization currents of lithium batteries vary among different charging states.In view of this,an equalization current adaptive lithium battery equalizer is proposed.Based on Maas theory,the equalizer determines a multi-stage equalization current value calculation method,which can adaptively adjust equalization current according to current capacity of target battery.The structure,working principle and control strategy of the proposed equalizer are described in detail,and the experiment is carried out on an equalizer experimental platform containing as series of 12 batteries.The experimental results show that the proposed equalizer improves the equalization efficiency under the premise of ensuring safety of battery operation,and has feasibility,simple structure and ease of implementation.