Method and System for Estimating Life-Expectancy of Secondary Battery
First Claim
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1. A method for estimating a life expectancy of a secondary battery, comprising;
- determining an internal resistance of the secondary battery from variations in current and voltage;
determining an accumulating portion resistance of the secondary battery from the internal resistance;
determining an increase coefficient of said accumulating portion resistance from condition parameters including an operating voltage and a surrounding temperature of the secondary battery; and
estimating a life expectancy of the secondary battery from the accumulating portion resistance and the increase coefficient.
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Abstract
It is an object of the present invention to provide a technique for specifically estimating a life expectancy of a secondary battery. The technique performs the steps of: determining an accumulating portion resistance of the secondary battery from an internal resistance thereof; determining an accumulating portion resistance increase coefficient under operating conditions of the secondary battery; and estimating a life expectancy of the secondary battery from the accumulating portion resistance and the accumulating portion resistance increase coefficient.
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Citations
20 Claims
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1. A method for estimating a life expectancy of a secondary battery, comprising;
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determining an internal resistance of the secondary battery from variations in current and voltage; determining an accumulating portion resistance of the secondary battery from the internal resistance; determining an increase coefficient of said accumulating portion resistance from condition parameters including an operating voltage and a surrounding temperature of the secondary battery; and estimating a life expectancy of the secondary battery from the accumulating portion resistance and the increase coefficient. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for estimating a life expectancy of a secondary battery, comprising:
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an input/output unit; an operation unit; a storage unit; and an interface unit; wherein said operation unit further comprising; an internal resistance determining unit; an accumulating portion resistance determining unit; an increase coefficient of accumulating portion resistance determining unit; and a life-expectancy estimation unit; wherein said increase coefficient determining unit configured to determine an increase coefficient of accumulating portion resistance by assigning operating condition parameters including an operating temperature and an operating voltage of the secondary battery; and wherein said life-expectancy estimation unit configured to estimate a life expectancy of the secondary battery using said accumulating portion resistance and said increase coefficient of accumulating portion resistance. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A secondary battery life-expectancy estimation system for estimating a life expectancy of a secondary battery, comprising:
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an internal resistance determining means for determining an internal resistance of the secondary battery from variations in current and voltage; an accumulating portion resistance determining means for determining an accumulating portion resistance of the secondary battery from the internal resistance; an increase coefficient determining means for determining an increase coefficient of said accumulating portion resistance from condition parameters including an operating voltage and a surrounding temperature of the secondary battery; and a life expectancy estimating means for estimating a life expectancy of the secondary battery from the accumulating portion resistance and the increase coefficient. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification