基于单体电池动态供电方法的均衡电路

Balancing Circuit Based on Single Battery Dynamic Power Supply Method

为较好地同时兼顾元器件使用数目、均衡转换效率、均衡速度以及可以较为方便地对电池组内任意单体电池进行均衡的需求,提出一种均衡电路。通过控制与每节单体电池以及附加电源相对应的继电器的动作状态,使需要被均衡的单体电池不对外放电,而同组中的其他单体电池处于正常工作状态,达到对电池组进行均衡的目的。详细阐述了均衡电路的工作原理,分析了均衡电路两种工作模式及工作特点,并采用此均衡电路对串联的7节具有不同初始荷电状态(state of charge,SOC)的18650电池进行了均衡实验。实验结果表明,所提出的均衡电路,能够较好地对单体电池进行均衡,使电池组达到设定的均衡状态,证实了该电路的可行性。

In order to balance the number of components use,conversion efficiency,equilibrium speed and balance each cell in battery pack easy,a balanced circuit is proposed.By controlling the action state of the relay that corresponds to each single cell and additional power supply,the balanced single cell is not discharged,while the other single cell in the same group is in normal working condition,to achieve target for the battery group.The working principle of the balanced circuit is described in detail,and the two operating modes of the balanced circuit and the working characteristics of the balanced circuit are analyzed.The balanced circuit is used to balance the 7 nodes with different initial state of charge(SOC)in series.The experimental results show that the proposed equalization circuit can better balance the battery and achieve the equilibrium state of the battery pack,confirmed the feasibility of the circuit.