Study on Adaptive Cycle Life Extension Method of Li-Ion Battery Based on Differential Thermal Voltammetry Parameter Decoupling

Energies

Qian Wang¹  Jianqiang Kang²  Jing V. Wang³  Guorong Zhu³  Shengjie Yang³  Zhixuan Wu³ 

[1] Department of Energy Technology, University Aalborg, 9220 Aalborg, Denmark;Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan 430070, China;School of Automation, Wuhan University of Technology, Wuhan 430070, China;

关键词: li-ion battery;    differential thermal voltammetry;    stoichiometric drift;    DTV adaptive;   

DOI  :  10.3390/en14196239

来源: DOAJ

【 摘 要 】

Battery aging leads to reduction in a battery’s cycle life, which restricts the development of energy storage technology. At present, the state of health (SOH) assessment technology, which is used to indicate the battery cycle life, has been widely studied. This paper tries to find a way to adjust the battery management system adaptively in order to prolong the battery cycle life with the change of SOH. In this paper, an improved Galvanostatic Intermittent Titration Technique (GITT) method is proposed to decouple the terminal voltage into overpotential (induced by total internal resistance) and stoichiometric drift (caused by battery aging, indicated by OCV). Based on improved GITT, the open circuit voltage-temperature change (OCV-dT/dV) characteristics of SOH are described more accurately. With such an accurate description of SOH change, the adaptive method to change the discharge and charge cut-off voltage is obtained, whose application can prolong battery cycle life. Experiments verify that, in the middle of a battery’s life-cycle, the adaptive method to change the discharge and charge cut-off voltage can effectively improve the cycle life of the battery. This method can be applied during the period of preventive maintenance in battery storage systems.

【 授权许可】

Unknown