Abstract
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.
Highlights
In recent years, electrochemical energy storage technology has played a key role in the application of smart grid, electric vehicle and ship electrical systems
Based on the differential thermal voltammetry (DTV) principle, this paper proposes an improved Galvanostatic Intermittent Titration Technique (GITT) method, which can describe the open circuit voltage-temperature change (OCV-dT/dV) characteristics of state of health (SOH) more accurately by decoupling the terminal voltage into overpotential and stoichiometric drift
During the charge–discharge cycle of the standard GITT experiment, in order to make the battery rest time long enough, the battery rest time is set to 30 min, and the terminal voltage after 30 min is approximately taken as OCV value of each State of Charge (SOC) point
Summary
Electrochemical energy storage technology has played a key role in the application of smart grid, electric vehicle and ship electrical systems. These studies focusing on chemical materials and physical structures of Li-ion batteries have positive effects on improving the cycle life of the battery They are at the stage of sample preparation currently. Based on the DTV principle, this paper proposes an improved GITT method, which can describe the open circuit voltage-temperature change (OCV-dT/dV) characteristics of state of health (SOH) more accurately by decoupling the terminal voltage into overpotential and stoichiometric drift. On this basis, the adaptive charge–discharge voltage boundary is found to prolong the cycle life of the battery, and the adaptive adjustment of the battery management system is made.
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