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The main method of battery prediction and health management evaluation (PHM) is to determine the health status and remaining useful life (RUL)of the battery, so as to ensure the safe and reliable operation of the lithium-ion battery and realize the life optimization. Lithium battery RUL prediction is not only a hot issue but a challenge in PHM. The accuracy of its prediction method will also directly affect the overall performance of the Battery Management System (BMS).This paper introduced the evaluation standard of single cell, and analyzed the main factors affecting the cycle life of lithium battery in detail. Briefly described the battery calendar life and cycle life. Summarized the remaining life prediction methods of lithium-ion batteries in recent years and compared the advantages and disadvantages of different methods.Thus, proposed the key problems in predicting the RUL of lithium battery in practical application, and discussed.