Analysis on the Distinguishability of Ageing Mechanisms within a Doyle-Fuller-Newman Framework

Research output: Contribution to conferencePaperAcademic

Abstract

Battery models play an important role in the application of Li-ion batteries, allowing battery management systems to make the most out of Li-ion cells. Electrochemistry-based models can provide detailed information about internal states. However, toolboxes and implementations of electrochemistry-based models rarely consider ageing phenomena. Furthermore, those that do model ageing mechanisms in their implementation, do not address issues with identifiability of model parameters and the distinguishability of different ageing mechanisms. In this work, the most-studied ageing phenomena are implemented into the Doyle-Fuller-Newman model and their distinguishability is studied. It will be shown that Solid-Electrolyte-Interphase formation and Lithium Plating are indistinguishable at a constant temperature and some of their model parameters are unidentifiable. We further show that
operating conditions such as C-rate and upper cut-off voltage (UCV) can be used to distinguish loss of active material and cathode degradation, respectively, since they respond proportionally more to the operating conditions than other ageing phenomena.
Original languageEnglish
Number of pages6
Publication statusAccepted/In press - 2024
EventAmerican Control Conference - Westin Harbour Castle, Toronto, Canada
Duration: 8 Jul 202412 Jul 2024
https://acc2024.a2c2.org/

Conference

ConferenceAmerican Control Conference
Country/TerritoryCanada
CityToronto
Period8/07/2412/07/24
Internet address

Keywords

  • Modeling
  • Lithium batteries
  • Ageing

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