INTERNAL RESISTANCE ESTIMATION DEVICE AND METHOD OF ESTIMATING INTERNAL RESISTANCE
First Claim
1. An internal resistance estimation device for estimating an internal resistance of an electric storage device comprising:
- a current measurement portion configured to measure a charge current to the electric storage device;
a voltage measurement portion configured to measure a terminal voltage of the electric storage device; and
a controller configured to estimate an internal resistance of the electric storage device based on the charge current and the terminal voltage measured in a restrictive period of charge time for charging the electric storage device, the restrictive period being a period in which a time variation in charge current is constant.
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Accused Products
Abstract
An internal resistance estimation device for estimating an internal resistance of an electric storage device includes a current measurement portion, a voltage measurement portion, and a controller. The current measurement portion is configured to measure a charge current to the electric storage device. The voltage measurement portion is configured to measure a terminal voltage of the electric storage device. The controller is configured to estimate an internal resistance of the electric storage device based on the charge current and the terminal voltage measured in a restrictive period of charge time for charging the electric storage device. The restrictive period is a period in which a time variation in charge current is constant.
26 Citations
14 Claims
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1. An internal resistance estimation device for estimating an internal resistance of an electric storage device comprising:
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a current measurement portion configured to measure a charge current to the electric storage device; a voltage measurement portion configured to measure a terminal voltage of the electric storage device; and a controller configured to estimate an internal resistance of the electric storage device based on the charge current and the terminal voltage measured in a restrictive period of charge time for charging the electric storage device, the restrictive period being a period in which a time variation in charge current is constant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An internal resistance estimation device for estimating an internal resistance of an electric storage device comprising:
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a current measurement portion configured to measure a charge current to the electric storage device; a voltage measurement portion configured to measure a terminal voltage of the electric storage device; and a controller configured to estimate an internal resistance of the electric storage device based on the charge current and the terminal voltage measured in a ramp region of charge time for charging the electric storage device, the ramp region being a region in which the charge current varies to rise. - View Dependent Claims (11, 12, 13)
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14. A method of estimating an internal resistance of an electric storage device, the method comprising:
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measuring a charge current and a terminal voltage of the electric storage device in a restrictive period of charge time for charging the electric storage device, the restrictive period being a period in which a time variation of the charge current is constant; and estimating an internal resistance of the electric storage device based on the measured charge current and the measured terminal voltage.
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Specification