Imperial College London
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ProfessorGuillermoRein

Faculty of Engineering, Department of Mechanical Engineering

Professor of Fire Science
 
 
 
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Contact

 

+44 (0)20 7594 7036g.rein Website CV

 
 
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Assistant

 

Ms Eniko Jarecsni +44 (0)20 7594 7029

 
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Location

 

614City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{He:2022:10.1016/j.applthermaleng.2022.118621,
author = {He, X and Hu, Z and Restuccia, F and Fang, J and Rein, G},
doi = {10.1016/j.applthermaleng.2022.118621},
journal = {Applied Thermal Engineering},
pages = {1--11},
title = {Experimental study of the effect of the state of charge on self-heating ignition of large ensembles of lithium-ion batteries in storage},
url = {http://dx.doi.org/10.1016/j.applthermaleng.2022.118621},
volume = {212},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Self-heating can cause the ignition of open-circuit Lithium-ion batteries. Current safety literature focuses on the self-heating chemistry of a single cell, ignoring the effects of heat transfer. However, a large ensemble of batteries has a non-uniform temperature distribution and therefore self-heating ignition is dominated by both heat transfer and chemistry. This type of ignition is of importance when batteries are stored for long periods of time and in large ensembles but has been rarely studied to date. This paper studies the effect of the state of charge (SOC) on the self-heating behavior of LiCoO2 prismatic cells. The SOC of 0% (of interest in the safety of waste facilities), 30% (transport), 50% (storage), 80% (aged battery) and 100% (fully-charged battery), and 1, 2 and 4 cells stacked together were studied using oven experiments. Results show that cells at all SOC can self-ignite. Flames were only observed for SOC larger than 80%. We compare two temperature criteria: the temperature of the middle cell using the critical increase rate of 10 /min defined in standard SAE-J2464, and the ambient temperature around the ensemble when triggering ignition. Both temperature criteria decrease with increasing SOC showing that the hazard grows with energy density. The cell temperature criterion is independent of the number of cells, while the ambient temperature criterion decreases as the number of cells increases, which indicates the increased risk of self-heating ignition when cells are stacked together in ensembles. Thus, the ambient temperature criterion should be used to design safe storage rather than the standard cell temperature increase rate, which does not represent well the criticality of ignition. The effective kinetics and thermal properties at different SOCs are extracted based on the Frank-Kamenetskii theory and are used to upscale laboratory results to storage conditions. The results in this work can improve the safety of the storage and provide scient
AU  - He,X
AU  - Hu,Z
AU  - Restuccia,F
AU  - Fang,J
AU  - Rein,G
DO  - 10.1016/j.applthermaleng.2022.118621
EP  - 11
PY  - 2022///
SN  - 1359-4311
SP  - 1
TI  - Experimental study of the effect of the state of charge on self-heating ignition of large ensembles of lithium-ion batteries in storage
T2  - Applied Thermal Engineering
UR  - http://dx.doi.org/10.1016/j.applthermaleng.2022.118621
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000806870300004&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://www.sciencedirect.com/science/article/pii/S1359431122005683?via%3Dihub
UR  - http://hdl.handle.net/10044/1/98673
VL  - 212
ER  -
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