Publication detail

Axially and radiallly inhomogeneous swelling in commercial 18650 Li-ion battery cells

BLAŽEK, P. WESTENBERGER, P. ERKER, S. BŘÍNEK, A. ZIKMUND, T. RETTENWANDER, D. WAGNER, N. KECKES, J. KAISER, J. KAZDA, T. VYROUBAL, P. MAČÁK, M. TODT, J.

Original Title

Axially and radiallly inhomogeneous swelling in commercial 18650 Li-ion battery cells

Type

journal article in Scopus

Language

English

Original Abstract

Aging of lithium-ion batteries is especially important for applications such as battery electric vehicles, where they constitute a major part of the total cost and practically determine product lifetime. One of the main problems during cycle aging is the swelling of the electrode stack, as this results in increased mechanical stresses inside batteries and can further accelerate aging. Earlier studies have used X-ray tomography to address this issue and were focused on the role of large aberrations in electrode geometry in rapid capacity fade. In this study, however, we focus on batteries not exhibiting such a rapid deterioration, where only small changes to electrode geometry can be expected. Helical trajectory micro-computed X-ray tomography and virtual unrolling were used to reveal axially and radially inhomogeneous swelling of the jelly-roll electrode windings inside commercial 18650 batteries. The results supported by mathematical-physical simulations demonstrate the efficacy of the employed methods in the analysis of minute volumetric changes and show that regions inside the batteries that are comparatively unconstrained mechanically experience accelerated swelling. In particular, the top and bottom of the jelly-roll showed an elevated thickness increase, especially within the innermost windings.

Keywords

Lithium-ion battery; Aging; swelling; X-ray computed tomography; Virtual unrolling

Authors

BLAŽEK, P.; WESTENBERGER, P.; ERKER, S.; BŘÍNEK, A.; ZIKMUND, T.; RETTENWANDER, D.; WAGNER, N.; KECKES, J.; KAISER, J.; KAZDA, T.; VYROUBAL, P.; MAČÁK, M.; TODT, J.

Released

27. 5. 2022

Publisher

Journal of Energy Storage

ISBN

2352-152X

Periodical

Journal of Energy Storage

Year of study

52

Number

2022

State

Kingdom of the Netherlands

Pages from

1

Pages to

10

Pages count

10

URL

https://doi.org/10.1016/j.est.2022.104563

BibTex

@article{BUT178680,
  author="Pavel {Blažek} and Peter {Westenberger} and Simon {Erker} and Adam {Břínek} and Tomáš {Zikmund} and Daniel {Rettenwander} and Nils Peter {Wagner} and Jozef {Keckes} and Jozef {Kaiser} and Tomáš {Kazda} and Petr {Vyroubal} and Martin {Mačák} and Juraj {Todt}",
  title="Axially and radiallly inhomogeneous swelling in commercial 18650 Li-ion battery cells",
  journal="Journal of Energy Storage",
  year="2022",
  volume="52",
  number="2022",
  pages="1--10",
  doi="10.1016/j.est.2022.104563",
  issn="2352-152X",
  url="https://doi.org/10.1016/j.est.2022.104563"
}