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Mathematical Problems in Engineering
Volume 2015 (2015), Article ID 294793, 10 pages
http://dx.doi.org/10.1155/2015/294793
Research Article

Multistage CC-CV Charge Method for Li-Ion Battery

1College of Electrical and Electronic Engineering, Harbin University of Science and Technology, Xue Fu Road 52, Harbin 150080, China
2State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing, China
3School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin, China

Received 18 August 2015; Revised 26 September 2015; Accepted 28 September 2015

Academic Editor: Xiaosong Hu

Copyright © 2015 Xiaogang Wu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Charging the Li-ion battery with constant current and constant voltage (CC-CV) strategy at −10°C can only reach 48.47% of the normal capacity. To improve the poor charging characteristic at low temperature, the working principle of charging battery at low temperature is analyzed using electrochemical model and first-order RC equivalent circuit model; moreover, the multistage CC-CV strategy is proposed. In the proposed multistage CC-CV strategy, the charging current is decreased to extend the charging process when terminal voltage reaches the charging cut-off voltage. The charging results of multistage CC-CV strategy are obtained at 25°C, 0°C, and −10°C, compared with the results of CC-CV and two-stage CC-CC strategies. The comparison results show that, at the target temperatures, the charging capacities are increased with multistage CC-CV strategy and it is notable that the charging capacity can reach 85.32% of the nominal capacity at −10°C; also, the charging time is decreased.