Hybrid Equivalent Circuit Model of Lithium Ion Battery Considering Nonlinear Capacity Effects
Sun Zhaohui1, Cheng Xiaoxiao2,3, Chen Dongdong1, Chen Guozhu1
1.College of Electrical Engineering Zhejiang University Hangzhou 310027 China 2.Institut de Recherche en Energie Electrique de Nantes Atlantique Nantes BP406,44602 France 3.Institute of Electric Drives and Control System Shanghai Maritime University Shanghai 201306 China
Abstract：Based on the Thevenin equivalent circuit model of the lithium ion battery,a state-of-charge (SOC) part is added into the model,so as to improve the accuracy of SOC estimation and to embody the nonlinear capacity effect of the lithium ion battery.The battery capacity is divided into two parts,i.e.the available capacity and the unavailable capacity,the introduction of which appropriately describe the rated capacity effect when the battery is working and the recovery effect when the battery is not working.Meanwhile,a new definition of the SOC is given to estimate the SOC of the battery through the state-of-charge part of the proposed model in real-time.And a one-to-one relationship is built up between the open circuit voltage of battery and the SOC.Moreover,the second-order polarization RC network in the Thevenin equivalent model is upgraded into a third-order one,with real physical significance added to the third-order RC network in order to make the polarization effect more accurate.Finally,the simulation waveforms within Simulink indicate the validity of the proposed model.
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2016, Vol. 31 
