scholarly journals Electrical Equivalent Circuit Models of Lithium-ion Battery

2021 ◽  
Author(s):  
Rushali R. Thakkar
Keyword(s):  
Lithium Ion Battery ◽  
Equivalent Circuit ◽  
System Performance ◽  
Lithium Ion ◽  
Equivalent Model ◽  
System Efficiency ◽  
Ideal Model ◽  
Electrical Equivalent Circuit ◽  
Systematic Comparison ◽  
Comparison And Analysis

Modelling helps us to understand the battery behaviour that will help to improve the system performance and increase the system efficiency. Battery can be modelled to describe the V-I Characteristics, charging status and battery’s capacity. It is therefore necessary to create an exact electrical equivalent model that will help to determine the battery efficiency. There are different electrical models which will be discussed and examined along with the benefits and demerits. A systematic comparison and analysis using simulation will help us to select an ideal model which will suit best to a specific application.

Model Identification of Power Lithium-Ion Battery Based on Laplace Transform

2014 ◽  
Vol 953-954 ◽  
pp. 775-779
Author(s):  
En Guang Hou ◽  
Xin Qiao ◽  
Guang Min Liu
Keyword(s):  
Laplace Transform ◽  
Lithium Ion Battery ◽  
Equivalent Circuit ◽  
Least Squares Method ◽  
Equivalent Circuit Model ◽  
Lithium Ion ◽  
Second Order ◽  
Equivalent Model ◽  
Model Parameters ◽  
Test Model

In allusion to nonlinear characteristic of power lithium-ion battery, presented a method for identifying of power lithium-ion battery based on Laplace transform. First, analyzed the characteristics of the equivalent circuit model of power lithium-ion battery, determined the model of second-order RC equivalent circuit; Second, established equation of second-order RC equivalent circuit and conducted a Laplace transform; Third,using the massive data of charge-discharge test,model parameters was identified by least-squares method; Simulation results show that the method can effectively identify the equivalent model parameters, and model parameters small error.

scholarly journals The parameter identification method study of the splice equivalent circuit model for the aerial lithium-ion battery pack

2018 ◽  
Vol 51 (5-6) ◽  
pp. 125-137 ◽  
Author(s):  
Shunli Wang ◽  
Carlos Fernandez ◽  
Xiaohan Liu ◽  
Jie Su ◽  
Yanxin Xie
Keyword(s):  
Lithium Ion Battery ◽  
Equivalent Circuit ◽  
Experimental Studies ◽  
Equivalent Circuit Model ◽  
Lithium Ion ◽  
Circuit Model ◽  
Operating Conditions ◽  
Battery Pack ◽  
Equivalent Model ◽  
Model Parameters

According to the special condition expression of the aerial lithium-ion battery pack, a novel targeted equivalent model (Splice–Equivalent Circuit Model) is proposed and constructed. The Splice–Equivalent Circuit Model achieves the accurate mathematical expression of the special operating conditions and the working process for the lithium-ion battery pack, which is realized by using the equivalent simulation of different internal effects in the charging and discharging process of the battery pack. The theoretical study and analysis of the working principle is investigated to express the working characteristics of the aerial lithium-ion battery pack together with the experimental analysis. Then, the equivalent circuit model of the aerial lithium-ion battery pack is carried out on the composite construction methods. The experimental studies are carried out in order to identify the parameters of the improved Splice–Equivalent Circuit Model, obtaining respectable identification results of battery equivalent model parameters.

scholarly journals An Adaptive Estimation Scheme for Open-Circuit Voltage of Power Lithium-Ion Battery

2013 ◽  
Vol 2013 ◽  
pp. 1-6
Author(s):  
Yun Zhang ◽  
Chenghui Zhang ◽  
Naxin Cui
Keyword(s):  
Lithium Ion Battery ◽  
Equivalent Circuit ◽  
Open Circuit Voltage ◽  
Adaptive Estimation ◽  
Equivalent Circuit Model ◽  
Lithium Ion ◽  
Open Circuit ◽  
Adaptive Scheme ◽  
Power Battery ◽  
Estimation Scheme

Open-circuit voltage (OCV) is one of the most important parameters in determining state of charge (SoC) of power battery. The direct measurement of it is costly and time consuming. This paper describes an adaptive scheme that can be used to derive OCV of the power battery. The scheme only uses the measurable input (terminal current) and the measurable output (terminal voltage) signals of the battery system and is simple enough to enable online implement. Firstly an equivalent circuit model is employed to describe the polarization characteristic and the dynamic behavior of the lithium-ion battery; the state-space representation of the electrical performance for the battery is obtained based on the equivalent circuit model. Then the implementation procedure of the adaptive scheme is given; also the asymptotic convergence of the observer error and the boundedness of all the parameter estimates are proven. Finally, experiments are carried out, and the effectiveness of the adaptive estimation scheme is validated by the experimental results.

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