LITHIUM PLATING DETECTION METHOD AND APPARATUS

A method and apparatus for detecting lithium plating, and a method and apparatus for obtaining a polarization proportion are provided, and belong to the field of rechargeable battery technologies. The method includes: obtaining an open-circuit voltage of a rechargeable battery and a negative electrode open-circuit voltage of the rechargeable battery based on a state of charge of the rechargeable battery (205); obtaining a negative electrode polarization voltage of the rechargeable battery based on the open-circuit voltage of the rechargeable battery, a terminal voltage of the rechargeable battery, and a polarization proportion of the rechargeable battery (206), where the polarization proportion of the rechargeable battery represents a proportion that is of a negative electrode polarization voltage of the rechargeable battery to a polarization voltage of the rechargeable battery and that is obtained when the rechargeable battery is at a lithium plating critical point; obtaining a negative electrode voltage of the rechargeable battery based on the negative electrode open-circuit voltage of the rechargeable battery and the negative electrode polarization voltage of the rechargeable battery (207); and determining, based on the negative electrode voltage of the rechargeable battery, whether lithium plating occurs in the rechargeable battery (208). This method improves accuracy of lithium plating detection.