Patent ID: 7098625
Filing Date: 2006-08-29
Classification: G01R,H02J

Abstract:
1. A charge rate estimating apparatus for a secondary cell, comprising: a current detecting section capable of measuring a current flowing through the secondary cell; a terminal voltage detecting section capable of measuring a voltage across terminals of the secondary cell; a parameter estimating section that calculates an adaptive digital filtering using a cell model in a continuous time series shown in an equation (1) and estimates all parameters at one time, the parameters corresponding to an open-circuit voltage V a charge rate estimating section that estimates the charge rate from a previously derived relationship between an open-circuit voltage and a charge rate of the secondary cell and the open-circuit voltage V wherein s denotes a Laplace transform operator, A(s), B(s), and C(s) denote poly-nominal functions of s, wherein the open-circuit voltage V wherein s denotes the Laplace transform operator, A(s), B(s), and C(s) denote poly-nominal equation functions, h denotes a variable, and 1/G