矿用单轨吊磷酸铁锂电池组复合式分层均衡电路

在矿用单轨吊磷酸铁锂电池组连续的充放电循环中,各单体电池不一致性会导致电池组整体性能衰减、使用寿命缩短,传统电池组均衡方式均衡时间长、控制策略复杂。针对上述问题,在Buck-Boost均衡电路和飞渡电容均衡电路的基础上,提出了一种复合式分层均衡电路。底层和中间层Buck-Boost均衡电路按照二叉树结构构建,顶层飞渡电容均衡电路实现3个相邻电池组之间任意2个电池组的能量传递,使电池不仅能够在层内进行能量传递以实现相邻电池间均衡,还可在层间进行能量传递以实现非相邻电池间均衡。仿真结果表明,复合式分层均衡电路大大缩短了均衡时间,显著提高了电池电压一致性。

Composite layered equalization circuit for LiFePO_4 battery pack of mine-used monorail

In continuous charging and discharging cycle of LiFePO 4 battery pack of mine-used monorail,inconsistency among each single batteries will lead to overall performance degradation and shorten service life of the battery pack.Traditional battery pack equalization mode has long equalization time and complex control strategy.In order to solve the above problems,a composite layered equalization circuit was proposed based on Buck-Boost equalization circuit and flying-capacitor equalization circuit.Buck-Boost equalization circuits in bottom layer and middle layer are constructed according to binary tree structure,and flying-capacitor equalization circuit in top layer realizes energy transfer of any two batteries between three adjacent batteries,so that the batteries can not only transfer energy within layer to achieve equalization between adjacent batteries,but also transfer energy between layers to achieve equalization between non-adjacent batteries.The simulation results show that the composite layered equalization circuit greatly reduces equalization time and significantly improves battery voltage consistency.