Abstract
Incremental capacity analysis (ICA) is widely used in the battery decay mechanism analysis since the features of battery incremental capacity (IC) curves are closely related to battery aging and maximum available capacity. However, the traditional ICA method to estimate battery capacity mainly focuses on a single charging condition, and the influence of charging current on IC curves is ignored. In this paper, an adaptive capacity estimation method based on ICA considering the charging current is established. First, the charging experiments using different charging current rates under different battery aging statuses are designed and conducted. Then, the relationship between battery maximum available capacity, IC curve features, and charging current is investigated. Furthermore, the fitting method and data-driven method considering charging current are proposed and compared. Finally, the capacity estimation results prove the accuracy and adaptability of the proposed method.
Highlights
Lithium-ion batteries (LIBs) have been widely applied in electric vehicles because of their high energy/power density and low environmental impact [1]
Due to the harsh working conditions and their inherent poor durability, LIBs must be assisted by an advanced battery management system (BMS), which can ensure the safe and reliable operation of LIBs
Battery capacity is an essential parameter in battery management technology and can indicate the battery health status and remaining useful life [2]
Summary
Lithium-ion batteries (LIBs) have been widely applied in electric vehicles because of their high energy/power density and low environmental impact [1]. Some effective battery capacity estimation methods have been proposed, including the state of charge (SOC) based method [3,4], the data-driven based method [5,6], and the incremental capacity analysis (ICA) based method [7,8]. This paper will mainly focus on the impact of charging current rate on IC curve features, and further propose an adaptive ICA method to estimate battery capacity.
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