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Comparative Analysis of Battery Degradation Using EIS and Differential Capacity Methods for Single Cells and Modules

Authors:

Yixing Du, Maher Azaza, Erik Dahlquist, Anas Fattouh, Andreas Holmberg

Research group:

Digital and Circular Industrial Services

Publication Type:

Conference/Workshop Paper

Venue:

66th International Conference of Scandinavian Simulation Society

Abstract

Battery degradation plays a critical role in determining battery performance and in predicting the remaining useful life (RUL). Several methods exist to monitor degradation. Electrochemical Impedance Spectroscopy (EIS) is well-suited for single cells, but its application becomes more challenging when analyzing battery modules composed of multiple cells connected in series. Differential capacity analysis, expressed as either differential capacity versus voltage (dQ/dV) or differential voltage versus capacity (dV/dQ), can be applied to both single cells and modules. EIS allows tracking the deterioration of specific internal mechanisms within a cell. In contrast, the differential methods provide partial insights into these mechanisms. Typically, the dQ/dV curve exhibits three distinct peaks, which can be monitored over time to quantitatively assess the degree of degradation. This, in turn, enables the estimation of the state of health (SOH), and, to a certain extent, the remaining useful life provided that the data is correlated with results from batteries that have been cycled under controlled conditions. The paper presents examples demonstrating this approach, including comparisons between single cells and cells arranged in series.

Bibtex

@inproceedings{Du7274,
author = {Yixing Du and Maher Azaza and Erik Dahlquist and Anas Fattouh and Andreas Holmberg},
title = {Comparative Analysis of Battery Degradation Using EIS and Differential Capacity Methods for Single Cells and Modules},
booktitle = {66th International Conference of Scandinavian Simulation Society},
url = {http://www.ipr.mdu.se/publications/7274-}
}