考虑弛豫过程的锂离子电池电-热-老化耦合建模

In order to improve the modeling accuracy of lithium-ion batteries ，a coupled electro-thermal-aging modeling method for lithium-ion batteries considering the relaxation process is proposed. Based on the battery test data，the parameters of Thevenin equivalent circuit model are identified，and the multidimensional parameter table of lithium-ion battery model in different state of charge and state of health（SOH） is established. Considering that the traditional Thevenin model uses a fixed time constant，which leads to a poor fitting of the battery model for the terminal voltage during the relaxation period，a variable time constant method is used to optimize the terminal voltage response of the battery during the relaxation period. In terms of thermal characterization，the thermal model parameters of the battery are identified at different current multiplicities. The experimental results indicate that the proposed model can accurately reflect the terminal voltage，temperature，and SOH of lithium-ion battery under various operating conditions.