Method of estimating an internal temperature of a lithium-ion cell

Abstract

at a known internal temperature so as to determine a phase of impedance at a plurality of electrochemical impedance spectroscopy frequencies; b) carrying out a distribution of relaxation times analysis on said electrochemical impedance spectroscopy measurement; c) determining a characteristic frequency corresponding to an electrochemical impedance spectroscopy frequency associated with movement of lithium ions through a solid electrolyte interface layer of said cell, on the basis of said distribution of relaxation times analysis; d) providing a correlation curve representative of the relationship between the impedance phase at said characteristic frequency and internal temperature for said cell

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