Energy storage power station lithium battery capacity estimation method based on constant voltage charging duration

• Main Authors: ZHANG WEIJUN, CHEN DAWEI, CHEN JINYU, ZHANG SHULING, HAN XIAOLAN, GAO TONGTONG, LI ZHICHENG, DENG CHAOPING, ZHENG HONGXU, LEE SANG JUN, FAN YUANLIANG, ZHANG HAOTIAN, WANG ZHEN
• Format: Patent
• Language: Chinese; English
• Published: 20.10.2023
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention relates to an energy storage power station lithium battery capacity estimation method based on constant-voltage charging duration. Constant-voltage charging data and capacity data of a lithium battery are collected; according to the collected data, obtaining a constant-voltage charging duration, charging time and a differential charging time sequence; extracting features of the two time sequences, and forming a data set in combination with capacity label values; normalizing the data set and dividing the data set into a training set and a test set; building a multi-model combination regression model, and training and checking all regression models by using the training set and the test set; building a BP neural network, and training a BP model by using an estimation result of the multi-model combination regression model; and fusing output results of the three regression models by using a BP model and estimating the capacity of the battery. According to the method, a plurality of statistical chara