中文说明：
该Simulink仿真模型基于锂电池的二阶RC模型，采用扩展卡尔曼滤波算法实现锂电池的SOC估计。
English Description：
The Simulink simulation model is based on the second-order RC model of lithium battery, and the extended Kalman filter algorithm is used to estimate the SOC of lithium battery.