Lithium battery SOC estimation method based on adaptive spherical unscented Kalman filtering

• Main Authors: CAO WEN, WANG SHUNLI, QI CHUANGSHI, ZHU YONGJIE, CHEN CHAO, LIU KE, CHEN LEI, HUANG YAN, HOU YAN, LI YANG, YU CHUNMEI, HOU PING, FAN YONGCUN
• Format: Patent
• Language: Chinese; English
• Published: 23.05.2023
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses a lithium battery SOC estimation method based on adaptive spherical unscented Kalman filtering, and the method comprises the following steps: carrying out the intermittent aging degree measurement and real-time calibration calculation processing, and achieving the capacity normalization representation of lithium ion battery SOC estimation; on the basis of capacity normalization representation, an aging influence coefficient influenced by aging factors is obtained through calculation of an influence coefficient of an aging state on the electric quantity; on the basis of regular measurement and calibration, through synchronous acquisition and correction of a rated capacity and a cycle index related value, a function relationship of superposition cycle index correction is obtained; on the basis of aging influence coefficient and cycle index correction calculation, through combination of superposition calculation processing influenced by two factors, aging process characteristics of influe