Battery lithium precipitation detection method and device, readable storage medium and battery management system

The invention belongs to the technical field of batteries, and particularly relates to a battery lithium precipitation detection method and device, a readable storage medium and a battery management system. The method comprises the following steps: determining the cycle energy efficiency and health state of a battery in a charge-discharge test; determining the efficiency health change rate of the battery according to the cycle energy efficiency and the health state of the battery in the charge and discharge test; the efficiency health change rate represents the change of the cyclic energy efficiency change quantity along with the health state change quantity; determining a lithium precipitation detection result of the battery according to the efficiency health change rate and a change rate threshold value; the change rate threshold value represents a critical value of the efficiency health change rate when lithium precipitation occurs in the battery. Through the method and the device, the efficiency health change rate of the battery can be determined, the lithium precipitation detection result of the battery is determined according to the efficiency health change rate, no high-precision equipment is needed for performing any special test, the whole process is simple, convenient and feasible, the complexity is relatively low, and the method and the device can be applied more widely.