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

    3 Citations (Scopus)
    122 Downloads (Pure)

    Abstract

    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
    PublisherIEEE
    Number of pages8
    ISBN (Electronic)978-1-7281-0791-2
    ISBN (Print)978-1-7281-0792-9
    DOIs
    Publication statusPublished - 11 Nov 2019
    EventElectric Vehicles International Conference and Show - ICPE Solar Park, Romania
    Duration: 3 Sept 20194 Sept 2019
    https://www.evshow.ro/

    Conference

    ConferenceElectric Vehicles International Conference and Show
    Abbreviated titleEV2019
    Country/TerritoryRomania
    Period3/09/194/09/19
    Internet address

    Keywords

    • 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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