Energy Storage Science and Technology ›› 2021, Vol. 10 ›› Issue (2): 671-678.doi: 10.19799/j.cnki.2095-4239.2020.0346

• Energy Storage Test: Methods and Evaluation • Previous Articles     Next Articles

Experimental study on the cycle life of electric vehicle battery systems

Bin FAN1(), Chenglong JIANG1(), Chunjing LIN1, Yupeng LI1, Bayi YU2, Jinjie ZHANG1, Liang ZHANG1, Mengyang GAO1, Wei WANG1, Kun XIE1, Hong CHANG1   

  1. 1.China Automotive Technology and Research Center Co. , Ltd. , Tianjin 300300, China
    2.China Quality Certification Centre, Beijing 100070, China
  • Received:2020-10-20 Revised:2020-11-23 Online:2021-03-05 Published:2021-03-05

Abstract:

In this work, the factors that influence the cycle life of battery systems, such as the internal resistance, temperature, and the voltage difference between the cells, were systematically studied. We determined a fitting equation for the cycle life of battery systems and found that their discharge capacity showed an exponential decay. This characteristic can serve as a basis to predict and estimate the actual service life of battery systems. We also studied the capacity variation of battery cells for different discharge depths at different temperatures.

Key words: battery cells and systems, cycle life, internal resistance, cell voltage difference, life fit consistency

CLC Number: