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Chin. Phys. B, 2013, Vol. 22(8): 088801    DOI: 10.1088/1674-1056/22/8/088801

Analysis on the capacity degradation mechanism of a series lithium-ion power battery pack based on inconsistency of capacity

Wang Zhen-Poa, Liu Penga b, Wang Li-Fangb
a National Engineering Laboratory for Electric Vehicles, Beijing Institute of Technology, Beijing 100081, China;
b Key Laboratory of Power Electronics and Electric Drive, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
Abstract  The lithium-ion battery has been widely used as an energy source. Charge rate, discharge rate, and operating temperature are very important factors for the capacity degradations of power batteries and battery packs. Firstly, in this paper we make use of an accelerated life test and a statistical analysis method to establish the capacity accelerated degradation model under three constant stress parameters according to the degradation data, which are charge rate, discharge rate, and operating temperature, and then we propose a capacity degradation model according to the current residual capacity of a Li-ion cell under dynamic stress parameters. Secondly, we analyze the charge and discharge process of a series power battery pack and interpret the correlation between the capacity degradations of the battery pack and its charge/discharge rate. According to this cycling condition, we establish a capacity degradation model of a series power battery pack under inconsistent capacity of cells, and analyze the degradation mechanism with capacity variance and operating temperature difference. The comparative analysis of test results shows that the inconsistent operating temperatures of cells in the series power battery pack are the main cause of its degradation; when the difference between inconsistent temperatures is narrowed by 5 ℃, the cycle life can be improved by more than 50%. Therefore, it effectively improves the cycle life of the series battery pack to reasonably assemble the batteries according to their capacities and to narrow the differences in operating temperature among cells.
Keywords:  lithium-ion battery pack      series      capacity degradation      dynamic stress  
Received:  28 January 2013      Revised:  17 April 2013      Accepted manuscript online: 
PACS:  88.05.Hj (Energy content issues; life cycle analysis)  
  88.85.Hj (Electric vehicles (EVs))  
  82.47.Aa (Lithium-ion batteries)  
  88.80.ff (Batteries)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61004092 and 51007088), the National High Technology Research and Development Program of China (Grant Nos. 2011AA11A251 and 2011AA11A262), the International Science & Technology Cooperation Program of China (Grant Nos. 2010DFA72760 and 2011DFA70570), and the Research Foundation of National Engineering Laboratory for Electric Vehicles, China (Grant No. 2012-NELEV-03).
Corresponding Authors:  Wang Zhen-Po, Liu Peng     E-mail:;

Cite this article: 

Wang Zhen-Po, Liu Peng, Wang Li-Fang Analysis on the capacity degradation mechanism of a series lithium-ion power battery pack based on inconsistency of capacity 2013 Chin. Phys. B 22 088801

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