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Extending battery life: A low-cost practical diagnostic technique for lithium-ion batteries

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Title: Extending battery life: A low-cost practical diagnostic technique for lithium-ion batteries
Authors: Merla, Y
Wu, B
Yufit, V
Brandon, NP
Martinez-Botas, R
Offer, G
Item Type: Journal Article
Abstract: Modern applications of lithium-ion batteries such as smartphones, hybrid & electric vehicles and grid scale electricity storage demand long lifetime and high performance which typically makes them the limiting factor in a system. Understanding the state-of-health during operation is important in order to optimise for long term durability and performance. However, this requires accurate in-operando diagnostic techniques that are cost effective and practical. We present a novel diagnosis method based upon differential thermal voltammetry demonstrated on a battery pack made from commercial lithium-ion cells where one cell was deliberately aged prior to experiment. The cells were in parallel whilst being thermally managed with forced air convection. We show for the first time, a diagnosis method capable of quantitatively determining the state-of-health of four cells simultaneously by only using temperature and 2 voltage readings for both charge and discharge. Measurements are achieved using low-cost thermocouples and a single voltage measurement at a frequency of 1Hz, demonstrating the feasibility of implementing this approach on real world battery management systems. The technique could be particularly useful under charge when constant current or constant power is common, this therefore should be of significant interest to all lithium-ion battery users.
Issue Date: 16-Sep-2016
Date of Acceptance: 3-Sep-2016
URI: http://hdl.handle.net/10044/1/40331
DOI: https://dx.doi.org/10.1016/j.jpowsour.2016.09.008
ISSN: 1873-2755
Publisher: Elsevier
Start Page: 224
End Page: 231
Journal / Book Title: Journal of Power Sources
Volume: 331
Copyright Statement: © 2016, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/I00422X/1
Keywords: 09 Engineering
03 Chemical Sciences
Publication Status: Published
Appears in Collections:Faculty of Engineering
Earth Science and Engineering
Dyson School of Design Engineering
Grantham Institute for Climate Change