Method for evaluating service life of lithium ion battery in different recession modes

• Main Authors: WANG GANG, WANG YANGYANG, HOU ZHENKANG, LI YANG, LI WENHUA, HAO YONGYAO
• Format: Patent
• Language: Chinese; English
• Published: 18.10.2022
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention provides a method for evaluating the service life of a lithium ion battery in different recession modes, and the method comprises the following steps: carrying out the charging and discharging of the lithium ion battery at a certain temperature for many times; collecting a characteristic quantity set used for representing the characteristic quantity of the battery capacity in the charging and discharging process; selecting N types of feature quantities from the feature data set, and grouping the N types of feature quantities; inputting the values of the characteristic quantities of the same group into the preliminary prediction model, and outputting a predicted value of the battery capacity; repeating the previous step, and sequentially calculating predicted values of the battery capacities under different groups; fitting the predicted values with the same group to obtain a plurality of recession curves; and calculating errors between the plurality of recession curves and the standard curve, and