能量转移型锂电池组均衡电路的设计与研究

Design and research on energy transfer type of lithium battery equalization circuit

电动汽车用动力电池组都是由多个单体电池串联而成,单体电池之间性能不可能会完全相同,为解决电池之间的不一致性问题,介绍了以电感为储能元件,在电感电流断续模式下,通过能量转移方式来实现相邻两节电池之间的电池均衡,在电路拓扑结构中,使用电池自身的电压来作为驱动的外部电源,无需专用的驱动芯片来控制开关的开通和关断,这种均衡方法体积小,成本低,由于光耦的使用,使得只有在均衡的情况下,均衡电路本身才会产生损耗,具有效率高的特点。通过分析均衡电路的模型,配置电路的参数,有效地解决了串联电池组电池不一致的问题。

The power batteries for electric vehicles are composed of multiple single cells in series, whose performance could not be exactly the same. In order to solve the problem of the inconsistency between the batteries, a inductive energy storage component was introduced in this paper, the equalization between the adjacent two batteries battery was realized by way of energy transfer under the discontinuous inductor current mode. In circuit topology structure,the voltage of the battery itself was used as a driver of external power source without a dedicated driver chip to control the switch. This equilibrium method is small in size with low cost. Because the use of light coupling, it has the characteristics of high efficiency for that the equilibrium circuit itself will produce loss only under the condition of the equilibrium, The problem of the inconsistent between the batteries in series was effectively solved through the analysis of the model of equalization circuit, configuration parameters of the circuit.