Energy Storage Science and Technology ›› 2013, Vol. 2 ›› Issue (5): 522-527.doi: 10.3969/j.issn.2095-4239.2013.05.011

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Sorting methods of lithium ion batteries consistency

WANG Yongchen1, NI Jiangfeng1, WANG Haibo1, GAO Lijun1, HU Daozhong2, WANG Zidong2   

  1. 1 School of Energy,Soochow University,Suzhou 215006,Jiangsu,China;
    2 Battery Test Center,Northern Vehicle Research Institute of China,Beijing 100072,China
  • Received:2013-04-06 Revised:2013-06-04 Online:2013-10-19 Published:2013-10-19

Abstract: Lithium ion batteries have been widely used in daily life due to their high energy density and long cycle life. However, when many batteries are connected in series and/or in parallel to form a battery array, much reduced life span is often observed. The main reason is associated with poor quality uniformity of individual cells. This paper provides a brief summary of methods for sorting battery cells according to their consistency. The mechanisms and characteristics of these methods are presented, along with research progress in our group. We will show that electrochemical impedance spectroscopy (EIS) could provide an effective and rapid way to evaluate the uniformity of battery cells.

Key words: lithium ion battery, consistency, sorting, electrochemical impedance spectroscopy

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