Method for predicting cycle life of sodium ion battery and application of method in evaluation of battery cell process

The invention belongs to the technical field of secondary batteries, and particularly relates to a method for predicting the cycle life of a sodium-ion battery and application of the method to evaluation of a battery cell technological process. The method for predicting the cycle life of the sodium-ion battery comprises the following steps: S1, collecting cycle data of the sodium-ion battery; selecting a double-index equation: # imgabs0 #, and determining A1, A2, t1 and t2 by adopting battery cycle data; and S3, predicting the cycle life of the sodium ion battery by using the double-exponential equation obtained in the S2. A1, A2, t1 and t2 are determined by selecting a double-exponential equation and collecting experimental data of a certain number of cycles, so that the accuracy and reliability of predicting the cycle life of the sodium-ion battery are further improved; the method can provide guiding significance for battery cell formula design and process optimization of the battery through application in