Design-of-Experiments Analysis of Li-Ion Cell Capacity Fading in High Temperature Automotive Conditions

Richard Stocker, Asim Mumtaz, Neophytos Lophitis

Research output: Chapter in Book/Report/Conference proceedingConference proceedingpeer-review

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This paper examines the evolution of performance degradation through capacity fade in Li-ion cells when subjected to 8 months of automotive drive cycles in high temperature conditions. This is done by combining a temperature controlled, highly transient cycling approach with a design-of-experiments matrix varying charge current magnitude and Depth-of-Discharge, two factors known to be influential in ageing rate. The subsequent results are then analyzed using design-of-experiments methodology and trend analysis, comparing the rates of capacity evolution at various points in cell lifetime. What was found is that the cell ageing evolved in 3 main phases dependent on the cycling time
duration rather than Ah throughput. In early life, charge current was influential, while in later life depth-of-discharge proved significant. It was also clear, that the factors could not be treated in isolation, with higher order and interaction effects observed. This implies that modeling of cell ageing cannot be uniform across lifetime and must consider the different ageing phases of the cell.
Original languageEnglish
Title of host publication2019 Electric Vehicles International Conference, EV 2019
Number of pages8
ISBN (Electronic)978-1-7281-0791-2
ISBN (Print)978-1-7281-0792-9
Publication statusPublished - 11 Nov 2019
EventElectric Vehicles International Conference and Show - ICPE Solar Park, Romania
Duration: 3 Sep 20194 Sep 2019


ConferenceElectric Vehicles International Conference and Show
Abbreviated titleEV2019
Internet address


  • Lithium-ion
  • battery cell
  • equivalent circuit
  • model
  • simulation

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Electrical and Electronic Engineering

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