Multistage CC-CV Charge Method for Li-Ion Battery

Xiaogang Wu, Chen Hu, Jiuyu Du and Jinlei Sun

Mathematical Problems in Engineering, 2015, vol. 2015, 1-10

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.

Date: 2015
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Persistent link: https://EconPapers.repec.org/RePEc:hin:jnlmpe:294793

DOI: 10.1155/2015/294793

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