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

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 t...

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Bibliographic Details
Published inEnergies (Basel) Vol. 14; no. 19; p. 6239
Main Authors Wu, Zhixuan, Zhu, Guorong, Wang, Qian, Yang, Shengjie, Wang, Jing V., Kang, Jianqiang
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.10.2021
Subjects
Aging
Battery cycles
Decoupling
differential thermal voltammetry
DTV adaptive
Electrodes
Electrolytes
Energy storage
Heat
li-ion battery
Life extension
Lithium
Lithium-ion batteries
Open circuit voltage
Parameter identification
Preventive maintenance
stoichiometric drift
Storage systems
Technology assessment
Titration
Voltage
Voltammetry
Working conditions
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Summary: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.
ISSN:1996-1073
1996-1073
DOI:10.3390/en14196239