The estimation of the degree of capacity decay and drop-off point of lithium-ion batteries is one of the impor-tant issues in the field of battery recycling and reuse.Due to difficulties in directly measuring the capacity decay and poor ef-fectiveness of manual judgment,this paper proposes a lithium-ion battery drop-off point and decay identification method based on the capacity decay characteristics of batteries.Firstly,the capacity decay characteristics of lithium-ion batteries are calculated,and then the Savitzky-Golay filter algorithm is applied to correct abnormal battery capacity data,combined with the 3σ rule to determine the decay characteristics and decay proportion.Subsequently,the K-means clustering algorithm is used to find the decay threshold,and finally,the sliding observation window method is used to determine the battery capacity drop-off point and decay degree.The experiment shows that this method has good judgment effectiveness and can be used in the field of lithium-ion battery decay phenomenon identification.
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