Safety assessment of electrically cycled cells at high temperatures under mechanical crush loads

Published on Nov 1, 2020
· DOI :10.1016/J.ETRAN.2020.100087
Georgi Kovachev3
Estimated H-index: 3
(Graz University of Technology),
Christian Ellersdorfer4
Estimated H-index: 4
(Graz University of Technology)
+ 5 AuthorsWolfgang Sinz5
Estimated H-index: 5
(Graz University of Technology)
Abstract An ageing test procedure was developed in this work in order to assess the influence of battery degradation effects, occurring during electrical cycling of lithium-ion batteries at elevated temperatures, on the electrical and mechanical properties of the cells and on their safety behaviour under mechanical quasi-static crush loading. Commercial 41 A h NMC-LMO/graphite pouch cells were charged and discharged at 60 °C for 700 cycles at 1 C in an SOC range between 10 and 90%. Electrical properties of these batteries were evaluated every 100 cycles at room temperature. By the end of the cycling procedure, a 27% reduction of the initial capacity was observed. The behaviour of the fully charged aged cells under a quasi-static mechanical load was examined in a series of indentation tests, using a flat impactor geometry. This behaviour was compared to that of fresh cells. Test results show that all investigated electrically cycled cells exhibited a slight decrease in stiffness. Aged batteries also failed at higher compressive strengths and larger deformations. Post-mortem analysis of the aged cells was performed as a next step using scanning electron microscopy and the occurred degradation effects were evaluated in order to explain the changes observed in the battery electrical and mechanical properties.
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