Apparatus and method for estimating charge rate of secondary cell
First Claim
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 V0 which is an offset term of the equation (1) and coefficients of A(s), B(s), and C(s), which are transient terms; and
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 V0,
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Abstract
In charge rate estimating apparatus and method for a secondary cell, a current flowing through the secondary cell is measured, a voltage across terminals of the secondary cell is measured, an adaptive digital filtering is carried out using a cell model in a continuous time series shown in an equation (1), all of parameters at one time are estimated, the parameters corresponding to an open-circuit voltage which is an offset term of the equation (1) and coefficients of A(s), B(s), and C(s) which are transient terms, and, the charge rate is estimated from a relationship between a previously derived open-circuit voltage V0 and the charge rate SOC using the open-circuit voltage V0,
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- wherein s denotes a Laplace transform operator, A(s), B(s), and C(s) denote poly-nominal functions of s.
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Citations
15 Claims
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1. A charge rate estimating apparatus for a secondary cell, comprising:
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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 V0 which is an offset term of the equation (1) and coefficients of A(s), B(s), and C(s), which are transient terms; and 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 V0, - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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2. A charge rate estimating apparatus for a secondary cell, comprising:
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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 V0, which is an offset term of the equation (1), and coefficients of A(s), B(s), and C(s), which are transient terms; and 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 V0, - View Dependent Claims (13)
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10. A charge rate estimating method for a secondary cell, comprising:
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measuring a current flowing through the secondary cell; measuring a voltage across terminals of the secondary cell; calculating an adaptive digital filtering to provide an adaptive digital filter calculation using a cell model in a continuous time series shown in an equation (1); estimating all parameters at one time, the parameters corresponding to an open-circuit voltage V0, which is an offset term of the equation (1), and coefficients of A(s), B(s), and C(s), which are transient terms; and estimating 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 V0, - View Dependent Claims (12)
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11. A charge rate estimating method for a secondary cell, comprising:
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measuring a current flowing through the secondary cell; measuring a voltage across terminals of the secondary cell; calculating an adaptive digital filtering to provide an adaptive digital filter calculation using a cell model in a continuous time series shown in an equation (1); estimating all parameters at one time, the parameters corresponding to an open-circuit voltage V0, which is an offset term of the equation (1), and coefficients of A(s), B(s), and C(s), which are transient terms; and estimating 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 V0, - View Dependent Claims (15)
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14. A charge rate estimating apparatus for a secondary cell, comprising:
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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) estimates all of parameters at one time, the parameters corresponding to an open-circuit voltage V0 which is an offset term of the equation (1) and coefficients of A(s), B(s), and C(s) which are transient terms; and 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 V0,
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Specification