Li-ion cell impedance identification in the time domain as an alternative to identification in the frequency domain

Q3 Engineering

IFAC-PapersOnLine Pub Date : 2024-01-01 DOI:10.1016/j.ifacol.2024.08.520

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引用次数: 0

Abstract

Electrochemical Impedance Spectroscopy (EIS) is a widely used tool for selecting a pertinent Equivalent Circuit Model (ECM) of Li-ion cells which is characterized by non integer order operators. The main drawback of EIS is the long time required to scan a whole spectrum down to low frequencies. Thus, chronopotentiometry (CP) is an alternative method which consists in identifying impedance parameters using an excitation current sequence lasting a few seconds and the corresponding induced voltage variations. An impedance fractional model needs to be synthesized in order to allow simulation also in the time domain. The pertinence of CP is demonstrated using experimental results obtained with a Samsung 3.4 Ah Li-ion cell. Due to its inability to take into account the inductive behavior, fractional model used in the time domain exhibit limitations. Nevertherless, parameters identified in the time domain present similar results to the ones identified in the frequency domain under the condition of a restricted frequency range.

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时域锂离子电池阻抗识别替代频域识别

电化学阻抗光谱法（EIS）是一种广泛使用的工具，用于选择锂离子电池的相关等效电路模型（ECM），该模型以非整数阶算子为特征。EIS 的主要缺点是扫描整个频谱到低频所需的时间较长。因此，时序电位计 (CP) 是一种替代方法，它利用持续几秒钟的激励电流序列和相应的感应电压变化来确定阻抗参数。需要合成阻抗分数模型，以便进行时域模拟。使用 Samsung 3.4 Ah 锂离子电池获得的实验结果证明了 CP 的相关性。由于无法考虑电感行为，时域中使用的分数模型表现出局限性。不过，在频率范围受限的条件下，时域中确定的参数与频域中确定的参数呈现出相似的结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IFAC-PapersOnLine Engineering-Control and Systems Engineering

CiteScore

1.70

自引率

0.00%

发文量

1122

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