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The Design and Optimize of Equalization Schemes for Underwater Power LiFePO4 Battery Stack |
Lü Hang1,2, Liu Chengzhi2, Yin Dong2, Lin Pengfeng2, Jia Junbo3 |
1.State Grid Leshan Power Supply Company Leshan 614000 China; 2.School of Electrical Engineering Southwest Jiaotong University Chengdu 610031 China; 3.Clean Energy Research Center Temasek Polytechnic Singapore 529757 Singapore |
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Abstract In order to improve life cycle and safety of underwater energy storage equipment,the research provides a smart battery management system (SBMS) for power lithium iron phosphate (LiFePO4) stack,and focuses on the cells equalization circuit.Two optimized schemes have been proposed for the Buck-Boost circuit based on inductors in order to improve performance of the equalizing time and the efficiency.The fuzzy current controller is used in system.A constant current charge-discharge experimental study is done on the underwater LiFePO4 stack and comparisons among the performances of three equalizing schemes are carried out.The optimized balancing scheme is implemented on a small electric vehicle,which verifies that the battery stack usage capacity has been improved.
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Received: 03 June 2015
Published: 02 November 2016
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