Research on power equalization using a low-loss DC-DC chopper for lithium-ion batteries in electric vehicle

International Conference on Energy Engineering and Environmental Protection 2016

能源学;生态环境科学

Wei, Y.W.^1 ; Liu, G.T.^2 ; Xiong, S.N.^1 ; Cheng, J.Z.^1 ; Huang, Y.H.^1

Hubei Collaborative Innovation Centre for Microgrid of New Energy, China Three Gorges University, Yichang, HB

443002, China^1

Dongguan Power Supply Bureau, Guangdong Power Grid Corporation, Dongguan

GD 523000, China^2

关键词: Analysis and controls;    Dc-dc choppers;    Equalization circuits;    Over discharge;    Power equalization;    Series-connected;    Small-scale experiment;    State of charge;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/52/1/012038/pdf
DOI  :  10.1088/1742-6596/52/1/012038

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

In the near future, electric vehicle is entirely possible to replace traditional cars due to its zero pollution, small power consumption and low noise. Lithium-ion battery, which owns lots of advantages such as lighter and larger capacity and longer life, has been widely equipped in different electric cars all over the world. One disadvantage of this energy storage device is state of charge (SOC) difference among these cells in each series branch. If equalization circuit is not allocated for series-connected batteries, its safety and lifetime are declined due to over-charge or over-discharge happened, unavoidably. In this paper, a novel modularized equalization circuit, based on DC-DC chopper, is proposed to supply zero loss in theory. The proposed circuit works as an equalizer when Lithium-ion battery pack is charging or discharging or standing idle. Theoretical analysis and control method have been finished, respectively. Simulation and small scale experiments are applied to verify its real effect.