Experimental study on relationship between SOC and OCV of lithium-ion batteries

Author(s): Qishui Zhonga,b,c*, Bo Huangb,c, Jianhua Mac, Hui Lia
a School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu 611731, China
b China Zhenhua Electronic Group Co Ltd, Guiyang 550018, China
c Sinowatt Dongguan Limited, Dongguan 523696,China
International Journal of Smart Grid and Clean Energy, vol. 3, no. 2, April 2014: pp. 149-153
ISSN: 2315-4462 (Print)
ISSN: 2373-3594 (Online)
Digital Object Identifier: 10.12720/sgce.3.2.149-153

Abstract: Electric vehicles (EVs) are developed rapidly due to the energy and the environment problem. Lithium-ion batteries play an important role in energy storage system of EVs or other devices. The characteristics of power lithium-ion batteries are closely connected to ambient temperature. A battery testing system, including the charge/discharge device, the thermal chamber, DAQ card and etc, was constructed. With which, the experiments of 18650 cells and packs are carried out for the laws between SOC and OCV, also for the discharge capacity with different rates and ambient temperatures. These results can be used in battery management system (BMS) design for electric vehicles.

Keywords: Lithium-ion battery, state of charge (SOC), charge-open circuit voltage (OCV), temperature characteristics

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