电动汽车新型双层均衡控制电路研究

Research on novel bidirectional equalization circuit for electric vehicle

为改善电动汽车锂电池组单体电池间电压不匹配而导致的放电能力减弱和使用寿命缩短的固有缺陷,提出一种新型的基于功率电感的双向无损控制电路的均衡方案,采用Buck-Boost改进电路将电池组进行模块化均衡。仿真结果表明,其容量效率ηc和能量效率ηE分别从均衡前的53.356%、58.692%提升到了59.582%、67.463%,从而可以有效起到均衡电池组间能量的目的,延长锂电池组的使用寿命。

In order to improve the inherent defects of the weakening discharge ability and the shortening service life due to mismatched voltage between each single battery of lithium battery pack in electric vehicle, this paper pro- posed a novel equalization scheme for bidirectional nondestructive control circuit based on power inductor. Buck - Boost was used in the scheme to improve circuit in making module balance in battery pack. The simulation results show that the capacity and energy efficiency increase respectively from 53. 356% and 58. 692% before the equilib- rium to 59. 582% and 67. 463%. The equilibrium method not only has the advantages of simple control structure and effectively preventing overcharge and over - discharge of single battery, but also can realize the dynamic trans- fer of energy between the lithium batteries, so as to make the battery voltage achieve the balance between the lithi- um batteries and the extension of the service life of the lithium battery.