PSM: Lithium-Ion Battery State of Charge (SOC) and Critical Surface Charge (CSC) Estimation using an Electrochemical Model-driven Extended Kalman Filter
نویسندگان
چکیده
This paper presents a numerical calculation of the evolution of the spatially-resolved solid concentration in the two electrodes of a lithium-ion cell. The microscopic solid concentration is driven by the macroscopic Butler Volmer current density distribution which is consequently driven by the applied current through the boundary conditions. The resulting, mostlycausal, implementation of the algebraic differential equations that describe the battery electrochemical principles, even after assuming fixed electrolyte concentration, is of high order and complexity and is denoted as the full-order model. The fullorder model is compared with the results in [22] and in [11] R3C1 and creates our baseline model which will be further simplified for charge estimation. We then propose a low-order extended Kalman filter (EKF) for the estimation of the average-electrode charge similarly to the single-particle charge estimation in [18] with the following R3C2 two substantial enhancements. First we estimate the averageelectrode, or single-particle, solid-electrolyte surface concentration, called critical surface charge (CSC) in addition to the more-traditional bulk concentration, called state of charge (SOC). Moreover, we avoid the weakly observable conditions associated with estimating both electrode concentations by recognizing that the measured cell voltage depends on the difference, and not the absolute value, of the two electrode open-circuit voltages. The estimation results of the reduced, single, averaged electrode model are compared with the full order model simulation.
منابع مشابه
ARC Collaborative Research Seminar Series Winter 2010
We will show how an electrochemical lithium-ion battery model is approximated with electrodeaveraged solid diffusion dynamics and parameterized through a reasonable set of experimental data. The parameterized model renders the critical solid-electrolyte surface charge as observable and allows the application of an extended Kalman filter for state of charge (SOC) estimation from the measured vol...
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تاریخ انتشار 2009