Patent ID: 8548762
Filing Date: 2013-10-01
Classification: G01R

Abstract:
1. A method, utilizing a computer programmed with an electrochemical model, for estimating an internal state of a rechargeable electrochemical system and including electrodes, a separator, and an electrolyte, the method comprising: receiving at least one input signal of at least one parameter representative of a physical quantity of the system; providing a computer programmed with the electrochemical model of the system for calculating variations over time of internal electrochemical variables of the system on a basis of the at least one input signal; and estimating an internal state of the system by generating at least one output signal representing the internal electrochemical variables derived from calculating variations over time of the electrochemical variables of the rechargeable electrochemical system by applying the at least one input signal to the model; and wherein the electrochemical model includes a mathematical representation of kinetics of electrochemical reactions that take place at interfaces between the electrodes and the electrolyte accounting for interface concentrations; a mathematical representation of a spatial accumulation of charges in a double layer capacity at each electrode; a mathematical representation of a redistribution of charges at the electrodes; a mathematical representation of a diffusion of ionic charges of the electrolyte through the electrodes and the separator; a material balance of the electrodes and the electrolyte of the system; an energy balance of the system for calculating a temperature of the system; and homogenous parameters within the electrodes and the separator.