Equivalent Circuit Evaluation Method of Lithium Polymer Battery Using Bode Plot and Numerical Analysis

Jang, Jae Hoon; Yoo, Jiyoon

doi:10.1109/tec.2010.2089796

Cited by 35 publications

(25 citation statements)

References 14 publications

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“…V bt (q, t) is the battery terminal voltage; I o is a constant discharge current acting as a battery load; a switch SW is employed to control the battery should be discharged. Calculation of V oc and R 1 When t<t o , the switch SW is turned off, and the battery is in open circuit. The battery terminal voltage is measured as the open voltage V oc , which can be found in the manufacturer datasheet or on its discharge curve shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…In Section V, Levy's method, a classical least-squares curve fitting of experimental data, is introduced and developed to identify small-signal model parameters. Levy's method has a relatively straightforward concept and is easy to program providing upright results in a broad range of circumstances for improving robustness, compared with published evaluation methods [1], [3], [6]- [10]. The proposed fundamental validity and method accuracy are verified by several experimental and simulation results in Section VI.…”

Section: Introductionmentioning

confidence: 88%

“…Fig. 3(c) shows a simplified AC small-signal model, which has a single equivalent parallel-connected RC circuit [1]. Difference is not observed between the series connection of two parallel-connected RC circuits in Fig.…”

Section: Ac Small-signal Model For Li-ion Batterymentioning

confidence: 99%

“…A rechargeable battery pack is a key component that is widely used in consumer applications, from portable devices to uninterruptible power supplies and hybrid electric vehicles [1]. A rechargeable battery, acting as an electrical energy storage element, is an electrochemical device that converts electrical energy to chemical energy during charging and converts chemical energy to electrical energy during discharging.…”

Section: Introductionmentioning

confidence: 99%

“…One may consider a certain circuit to be satisfactory match of the experiment plot, but a more critical researcher may not accept it, because there are one or several fitting points which are far away from the experimental results [11]. Thus, the Bode plot approach has been proposed to evaluate circuit parameters [1] because it produces more accurate parameter results and reduces one's subjectivity, compared with the Cole-Cole plot. However, the Bode plot approach also has some drawbacks.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Fundamental Small-signal Modeling of Li-ion Batteries and a Parameter Evaluation Using Levy's Method

Zhang¹,

Zhang²,

Zhang³

2017

Journal of Power Electronics

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The fundamental small-signal modeling of lithium-ion (Li-ion) batteries and a parameter evaluation approach are investigated in this study to describe the dynamic behaviors of small signals accurately. The main contributions of the study are as follows. 1) The operational principle of the small signals of Li-ion batteries is revealed to prove that the sinusoidal voltage response of a Li-ion battery is a result of a sinusoidal current stimulation of an AC small signals. 2) Three small-signal measurement conditions, namely stability, causality, and linearity, are proved mathematically proven to ensure the validity of the frequency response of the experimental data. 3) Based on the internal structure and electrochemical operational mechanism of the battery, an AC small-signal model is established to depict its dynamic behaviors. 4) A classical least-squares curve fitting for experimental data, referred as Levy's method, are introduced and developed to identify small-signal model parameters. Experimental and simulation results show that the measured frequency response data fit well within reading accuracy of the simulated results; moreover, the small-signal parameters identified by Levy's method are remarkably close to the measured parameters. Although the fundamental and parameter evaluation approaches are discussed for Li-ion batteries, they are expected to be applicable for other batteries.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 88%

Section: Ac Small-signal Model For Li-ion Batterymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Fundamental Small-signal Modeling of Li-ion Batteries and a Parameter Evaluation Using Levy's Method

Zhang¹,

Zhang²,

Zhang³

2017

Journal of Power Electronics

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Simultaneous model selection and parameter estimation for lithium‐ion batteries: A sequential MINLP solution approach

Shen

2015

AIChE Journal

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Equivalent circuit model (ECM) is a practical and commonly used tool not only in state of charge (SOC) estimation but also in state of health (SOH) monitoring for lithium-ion batteries (LIBs). The functional forms of circuit parameters with respect to SOC in ECM are usually empirical determined, which cannot guarantee to obtain a compact and simple model. A systematical solution framework for simultaneous functional form selection and parameter estimation is proposed. A bi-objective mixed-integer nonlinear programming (MINLP) model is first constructed. Two solution approaches, namely the explicit and implicit methods, are then developed to balance model accuracy and model complexity. The former explicitly treats the model complexity as a constraint and the latter implicitly embeds the model complexity into the objective as a penalty. Both approaches require sequential solution of the transformed MINLP model and an ideal and nadir ideal solutions-based criterion is utilized to terminate the solution procedure for determining the optimal functional forms, in which ideal solution and nadir ideal solution represent the best and worst of each objective, respectively. Both explicit and implicit approaches are thoroughly evaluated and compared through experimental pulse current discharge test and hybrid pulse power characterization test of a commercial LIB. The fitting and prediction results illustrate that the proposed methods can effectively construct an optimal ECM with minimum complexity and prescribed precision requirement. It is thus indicated that the proposed MINLP-based solution framework, which could automatically guide the optimal ECM construction procedure, can be greatly helpful to both SOC estimation and SOH monitoring for LIBs.

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Prognosis methods of stress corrosion cracking under harsh environmental conditions

Hamdan,

Alsit,

Al Tahhan

et al. 2024

Heliyon

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Equivalent Circuit Evaluation Method of Lithium Polymer Battery Using Bode Plot and Numerical Analysis

Cited by 35 publications

References 14 publications

Fundamental Small-signal Modeling of Li-ion Batteries and a Parameter Evaluation Using Levy's Method

Fundamental Small-signal Modeling of Li-ion Batteries and a Parameter Evaluation Using Levy's Method

Simultaneous model selection and parameter estimation for lithium‐ion batteries: A sequential MINLP solution approach

Prognosis methods of stress corrosion cracking under harsh environmental conditions

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