Patent ID: 6222369
Filing Date: 2001-04-24
Classification: G01R

Abstract:
Apparatus for determining an electrical, chemical, or physical property of an electrochemical cell or battery comprising:measuring circuitry adapted to couple to said cell or battery and adapted to determine a real part and an imaginary part of complex immittance of said cell or battery at a measurement frequency;control circuitry coupled to said measuring circuitry and adapted to command said measuring circuitry to select each one of n said measurement frequencies thereby defining n said real parts, n said imaginary parts and n said measurement frequencies where n is an integer number equal to or greater than two; and,computation circuitry coupled to said measuring circuitry and to said control circuitry and adapted to numerically combine values of said n real parts, said n imaginary parts, and said n measurement frequencies to evaluate one or more elements of a 2n-element equivalent circuit model and further adapted to determine said electrical, chemical, or physical property from one or more values of said elements.