Imperial College London
Alternate

Prof Gregory Offer

Faculty of Engineering, Department of Mechanical Engineering

Professor in Electrochemical Engineering
 
 
 
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Contact

 

+44 (0)20 7594 7072gregory.offer Website

 
 
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Location

 

720City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Hunt:2016:10.1149/2.0361609jes,
author = {Hunt, I and Zhao, Y and Patel, Y and Offer, GJ},
doi = {10.1149/2.0361609jes},
journal = {Journal of the Electrochemical Society},
pages = {A1846--A1852},
title = {Surface cooling causes accelerated degradation compared to tab cooling for lithium-Ion pouch cells},
url = {http://dx.doi.org/10.1149/2.0361609jes},
volume = {163},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - One of the biggest causes of degradation in lithium-ion batteries is elevated temperature. In this study we explored the effects ofcell surface cooling and cell tab cooling, reproducing two typical cooling systems that are used in real-world battery packs. For newcells using slow-rate standardized testing, very little difference in capacity was seen. However, at higher rates, discharging the cellin just 10 minutes, surface cooling led to a loss of useable capacity of 9.2% compared to 1.2% for cell tab cooling. After cyclingthe cells for 1,000 times, surface cooling resulted in a rate of loss of useable capacity under load three times higher than cell tabcooling. We show that this is due to thermal gradients being perpendicular to the layers for surface cooling leading to higher localcurrents and faster degradation, but in-plane with the layers for tab cooling leading to more homogenous behavior. Understandinghow thermal management systems interact with the operation of batteries is therefore critical in extending their performance. Forautomotive applications where 80% capacity is considered end-of-life, using tab cooling rather than surface cooling would thereforebe equivalent to extending the lifetime of a pack by 3 times, or reducing the lifetime cost by 66%.
AU  - Hunt,I
AU  - Zhao,Y
AU  - Patel,Y
AU  - Offer,GJ
DO  - 10.1149/2.0361609jes
EP  - 1852
PY  - 2016///
SN  - 0013-4651
SP  - 1846
TI  - Surface cooling causes accelerated degradation compared to tab cooling for lithium-Ion pouch cells
T2  - Journal of the Electrochemical Society
UR  - http://dx.doi.org/10.1149/2.0361609jes
UR  - https://iopscience.iop.org/article/10.1149/2.0361609jes
UR  - http://hdl.handle.net/10044/1/34389
VL  - 163
ER  -
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