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

@inproceedings{Schimpe:2020:10.1149/ma2020-02453808mtgabs,
author = {Schimpe, M and Barreras, JV and Wu, B and Offer, GJ},
doi = {10.1149/ma2020-02453808mtgabs},
pages = {3808--3808},
publisher = {The Electrochemical Society},
title = {Novel Degradation Model-Based Current Derating Strategy for Lithium-Ion-Batteries},
url = {http://dx.doi.org/10.1149/ma2020-02453808mtgabs},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - CPAPER
AB  - <jats:p>  Derating is the operation of an electrical or electronic device at less than its rated maximum capability in order to ensure safety, extend lifetime or avoid system shutdown. Relatively simple derating approaches have been proven effective for lithium-ion batteries. They are typically based on limiting battery charging and discharging currents to prevent operation outside certain operating areas, which are bounded by state-of-charge (SOC), voltage, or temperature levels, taken individually. The manufacturer’s datasheet provides hard limits for these operating areas, defining the so-called safe operating area (SOA). In order to prolong battery lifetime, more restrictive limits than the SOA can be defined, but this leads to reducing battery performance more frequently and intensively. However, it should be noted that these simple derating approaches do not fully capture the complexity of battery degradation mechanisms, since the actual rate of degradation is the result of an interaction of multiple operating conditions. Thus, they may overestimate or underestimate the optimal current limit. Indeed, many advanced degradation models that consider a combination of operating conditions have been proposed in the literature to predict the rate of degradation, in terms of capacity loss and/or internal resistance increase.</jats:p>               <jats:p>With this in mind, we propose the integration of an advanced degradation model in the derating strategy and thereby reduce degradation without significant losses in performance. The degradation model calculates the maximum battery current that will ensure reduced degradation rates, both for calendar and cycle related ageing processes. The calendar ageing rate is limited by defining the SOC-dependent maximum temperature that will keep the rate below a certain level, and then limiting the current accordingly, aiming to reduce self-heating effects that lead to temperature rise. The cycle ageing
AU  - Schimpe,M
AU  - Barreras,JV
AU  - Wu,B
AU  - Offer,GJ
DO  - 10.1149/ma2020-02453808mtgabs
EP  - 3808
PB  - The Electrochemical Society
PY  - 2020///
SP  - 3808
TI  - Novel Degradation Model-Based Current Derating Strategy for Lithium-Ion-Batteries
UR  - http://dx.doi.org/10.1149/ma2020-02453808mtgabs
ER  -
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