电动汽车动力电池均衡系统的设计和试验

针对成组前电池单体初始性能差异和使用过程中差异的放大等不良问题,考虑到主动均衡和被动均衡的优缺点,提出了一种电池单体之间采用主动均衡,电池包之间采用被动均衡的新均衡方案。系统以单体电池端电压和电池包端电压作为控制目标参数,根据电池单体的ε值和电池包的δ值与设定的阈值进行比较来控制场效应开关管和三极管的开闭,进而实现主动均衡和被动均衡。实验结果表明,均衡系统在充电、放电两种状态下都能够起到均衡效果,从而说明了均衡系统的有效性,达到了设计的目的。

Design and test study on balance system of electric vehicle power battery

Due to the difference of initial performance of single battery and the enlargement of the difference in use process,the advantages of active equalization and disadvantages of passive equalization were taken into account.A new type vehicle power battery balance system,which combined of inter-cell active balanced circuit and battery peak passive balanced circuit,was presented.The system took the single cell terminal voltage and the voltage of the battery pack as the control target,compared the ε value of the battery pack and the δ value of the battery pack with the value of threshold to control the the opening and closing of field effect transistor and bipolar junction transistor to realize the active balance and passive balance.The experiment results show that equalization system in two states of charging,discharge can play a balanced effect.The validity of the equilibrium system was illustrated and the purpose of design was achieved.