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Energy-transferring equalization scheme based on Boost-Buck circuit(PDF)

[ISSN:1007-449X/CN:23-1 408/TM]

Issue:
2017年09
Page:
73-79
Research Field:
Publishing date:

Info

Title:
Energy-transferring equalization scheme based on Boost-Buck circuit
Author(s):
?LIU Zheng-yu12 SUN Qing1 MA Ya-dong1 TANG Wei1 WANG Xue-song1
?(1. School of Mechanical Engineering,Hefei University of Technology,Hefei 230009,China; 2. Engineering Research Center of Safety Critical Industry Measurement and Control Technology of Ministry of Education,Hefei 230009,China)
Keywords:
charge and discharge equalization energy-transferring direction Boost-Buck circuit energy storage channel unloading channel
PACS:
TM 315
DOI:
10.15938/j.emc.2017.09.010
Abstract:
?A new equalization circuit based on Boost-Buck circuit was proposed,which realizes the charge and discharge equalization of series-connected lithium-ion batteries. Two different balancing strategies were used respectively according to the balanced energy-transferring direction. When battery pack was discharging,the balanced energy was transferred from the battery pack to the batteries with lower stage of charge (SOC); When battery pack was charging,the balanced energy was transferred from the higher SOC batteries to the battery pack. The scheme were based on online estimation of open circuit voltage (OCV)of single cell,which takes advantage of OCV-SOC curve to estimate the stage of charge( SOC), balanced objects were selected whose SOC are outside a certain range and an experiment was performed for six serially connected LiFeP04 battery cells. Experimental results confirm that the inconsistency between the single cells is validly reduced,the integrity of the battery pack is improved and the charging and discharging of battery pack is increased.

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Last Update: 2018-02-06