Study on Modelling and Analysis of Imbalanced Current inside Parallel-connected Lithium-ion Batteries for Electric Vehicle

doi:10.3901/JME.2019.20.044

Abstract

Abstract: Lithium-ion batteries are always connected in series and parallel in order to fulfill its functional usage. However, imbalanced current caused by cell variations has significant impact on the life and safety of battery pack. An equivalent circuit model for battery pack composing of cells connected in parallel is introduces. Experimental results show that the model has good accuracy under both steady and dynamic working loads. The proposed method simulates current distribution among parallel-connected cells and can help analyze the behaviors of current distribution. Simulation results show that the increase of the relative quantity I_Re and SOC_Re representing imbalanced current and state of charge (SOC) variation can be caused by the increase of battery capacity and resistance variation. 20% increase in capacity leads to I_Re increasing by 17.0% and SOC_Re increasing by 3.7%, while 100% increase in resistance leads to I_Re increasing by 18.2% and SOC_Re increasing by 5.7%.

Key words: energy storage, lithium-ion battery, imbalanced current, current distribution, equivalent circuit model

CLC Number:

TG156

HUANG Xin, FENG Xuning, HAN Xuebing, LU Languang, OUYANG Minggao. Study on Modelling and Analysis of Imbalanced Current inside Parallel-connected Lithium-ion Batteries for Electric Vehicle[J]. Journal of Mechanical Engineering, 2019, 55(20): 44-51.

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