Projects per year
Abstract
The safety of lithium-ion batteries has to be guaranteed over the complete lifetime considering geometry changes caused by reversible and irreversible swellings and degradation mechanisms. An understanding of the pressure distribution and gradients is necessary to optimize battery modules and avoid local degradation bearing the risk of safety-relevant battery changes. In this study, the pressure distribution of two fresh lithium-ion pouch cells was measured with an initial preload force of 300 or 4000 N. Four identical cells were electrochemically aged with a 300 or 4000 N preload force. The irreversible thickness change was measured during aging. After aging, the reversible swelling behavior was investigated to draw conclusions on how the pressure distribution affected the aging behavior. A novel test setup was developed to measure the local cell thickness without contact and with high precision. The results suggested that the applied preload force affected the pressure distribution and pressure gradients on the cell surface. The pressure gradients were found to affect the locality of the irreversible swelling. Positions suffering from large pressure variations and gradients increased strongly in thickness and were affected in terms of their reversible swelling behavior. In particular, the edges of the investigated cells showed a strong thickness increase caused by pressure peaks.
Original language | English |
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Article number | 218 |
Number of pages | 18 |
Journal | Batteries |
Volume | 9 |
Issue number | 4 |
Early online date | 31 Mar 2023 |
DOIs | |
Publication status | Published - 4 Apr 2023 |
Keywords
- aging
- constrained
- electric vehicles
- irreversible
- lithium-ion batteries
- pressure distribution
- reversible
- safety
- swelling
- thickness
ASJC Scopus subject areas
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering
- Electrochemistry
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21_FFG_SafeLIB - Safety Aspects of Lithium-Based Tractions Batteries Including the Qualification for Second Life Applications
Ellersdorfer, C., Wilkening, H. M. R. & Vorbach, S.
1/04/21 → 31/03/25
Project: Research project
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19_FFG_BonuS - Review of Li-ion battery modules on crash safety and life time in terms of breathing and swelling
Wilkening, H. M. R. & Heindl, S. F.
1/10/19 → 31/03/22
Project: Research project