Guidelines for the Characterization of the Internal Impedance of Lithium-Ion Batteries in PHM Algorithms

Aramis Perez, Matías Benavides, Heraldo Rozas, Sebastián Seria, and Marcos Orchard
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Publication Issue: 
Special Issue from PHMAP17 Highlights
Submission Type: 
Full Paper
ijphm_18_015.pdf1.18 MBApril 22, 2018 - 4:23pm

This article aims to describe the most important aspects to consider when using the concept of internal impedances in algorithms that focus on characterizing the State-of-Health (SOH) degradation of lithium-ion (Li-ion) batteries. The first part of the article provides a literature review that will help the reader understand the concept of electrochemical impedance spectroscopy (EIS) and how Li-ion batteries can be represented through electrochemical or empirical models, in order to interpret the outcome of typical discharge and/or degradation tests on Li-ion batteries. The second part of the paper shows the obtained results of an accelerated degradation experiment performed under controlled conditions on a Li-ion cell. Results show that changes observed on the EIS test that can be linked to battery degradation. This knowledge may be of great value when implementing algorithms aimed to predict the End-of-Life (EoL) of the battery in terms of temperature, voltage, and discharge current measurements. The purpose of this article is to introduce the reader to several types of Li-ion battery models, and show how the impedance is a dynamic parameter that depends on different factors; and then, illustrate how the EIS can be used to obtain an equivalent circuit model and how the different electronic components vary with the use.

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Publication Volume: 
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Page Count: 
Submission Keywords: 
lithium ion battery
Electrochemical Impedance Spectroscopy
Equivalent circuit model
Submission Topic Areas: 
Data-driven methods for fault detection, diagnosis, and prognosis
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