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Inhomogeneous Temperature Distribution Affecting the Cyclic Aging of Li-Ion Cells. Part II: Analysis and Correlation

Werner, Daniel; Paarmann, Sabine; Wiebelt, Achim; Wetzel, Thomas

Abstract:
Temperature has a significant influence on the behavior of batteries and their lifetime. There are several studies in literature that investigate the aging behavior under electrical load, but are limited to homogeneous, constant temperatures. This article presents an approach to quantifying cyclic aging of lithium-ion cells that takes into account complex thermal boundary conditions. It not only considers different temperature levels but also spatial and transient temperature gradients that can occur despite-or even due to-the use of thermal management systems. Capacity fade and impedance rise are used as measured quantities for degradation and correlated with the temperature boundary conditions during the aging process. The concept and definition of an equivalent aging temperature (EAT) is introduced to relate the degradation caused by spatial and temporal temperature inhomogeneities to similar degradation caused by a homogeneous steady temperature during electrical cycling. The results show an increased degradation at both lower and higher temperatures, which can be very well described by two superimposed exponential functions. These correlations also apply to cells that are cycled under the influence of spatial temperature gradients, both steady and transient. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000118142
Veröffentlicht am 08.04.2020
Originalveröffentlichung
DOI: 10.3390/batteries6010012
Scopus
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Thermische Verfahrenstechnik (TVT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2313-0105
KITopen-ID: 1000118142
Erschienen in Batteries
Verlag MDPI
Band 6
Heft 1
Seiten Art. Nr.: 12
Vorab online veröffentlicht am 14.02.2020
Schlagwörter lithium-ion cell, cyclic aging, low temperature aging, inhomogeneous temperature, transient temperature, high power pouch cell, equivalent aging temperature correlation
Nachgewiesen in Scopus
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