Consistency study on 18650 cells used in electric vehicles

AN Fu-qiang; ZHAO Jian-yuan; CHEN Lu-fan; HUANG Jun; LI Ping

doi:10.13374/j.issn2095-9389.2017.01.014

Volume 39 Issue 1

Jan. 2017

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AN Fu-qiang, ZHAO Jian-yuan, CHEN Lu-fan, HUANG Jun, LI Ping. Consistency study on 18650 cells used in electric vehicles[J]. Chinese Journal of Engineering, 2017, 39(1): 107-114. doi: 10.13374/j.issn2095-9389.2017.01.014

Citation:

AN Fu-qiang, ZHAO Jian-yuan, CHEN Lu-fan, HUANG Jun, LI Ping. Consistency study on 18650 cells used in electric vehicles[J]. Chinese Journal of Engineering, 2017, 39(1): 107-114. doi: 10.13374/j.issn2095-9389.2017.01.014

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Consistency study on 18650 cells used in electric vehicles

doi: 10.13374/j.issn2095-9389.2017.01.014

1) Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
2) Boston-Power Battery CO., Beijing 100015, China
3) Department of Automotive Engineering, Tsinghua University, Beijing 100084, China

Received Date: 2016-03-18

Abstract

Abstract

The consistency of five different 18650 cells used in electric vehicles both at the initial and aged states was evaluated by electrochemical test and statistical analysis. The effects of current, temperature and voltage on the cell consistency were examined. The results show that, to ensure a reasonable level of the cell consistency, the current rates during the charging and discharging processes should be less than 0.3C and 0.5C, respectively, and the operating temperature should be higher than 0℃. In addition, the cell sorting process is crucial to control the cell consistency. An additional descriptor, the k value, representing the decreasing rate of open circuit voltage during calendar test, should be involved in the cell sorting.
- electric vehicles,
- lithium-ion batteries,
- consistency analysis,
- electrochemical properties,
- statistical analysis

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References(13)

References

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