Paper Title
Parameter Estimation of Lithium-Ion Battery By Using Thevenin Model Based Equivalent Circuit Method

Lithium-ion (Li-ion) battery is a rechargeable battery that can be charged multiple times. Li-ion batteries are widely used as a power source for electronic devices and electric vehicles because they charge faster, last longer, and have a higher power density for more battery life in a lighter package. An accurate battery model is required to specify their effectiveness for different applications and to study their dynamic behavior. The equivalent circuit model (ECM) is mostly employed to control and monitor the dynamic behavior of lithium-ion battery. Moreover, the state of charge (SOC) is one of the most important parameters for batteries. It’s indeed impossible to measure directly the SOC and the other parameters of the battery because of the nonlinearity, temperature, and aging of the battery. Direct calculations are erroneous. Correct estimation of the battery’s parameters can only forecast the battery’s life span, improve battery performance, and improve the system’s safety and dependability. This paper proposes to estimate accurately the values of the parameters(SOC, current, OCV, V0, V1, V2 and Vbat) of a second-order Thevenin equivalent electrical circuit model of a Li-ion battery cell. Keywords - Parameters Estimation, Lithium-Ion Battery, Battery Model, Equivalent Circuit Model, State of Charge, Second-Order Thevenin Equivalent Electrical Circuit Model