DEVICE FOR ESTIMATING INTERNAL RESISTANCE OF BATTERY AND BATTERY PACK INCLUDING THE SAME
First Claim
1. A device for estimating internal resistance of a battery, comprising:
- a first memory unit that stores voltage difference values between sampled voltage values and current difference values between sampled current values for a predetermined period of time;
a selection unit that periodically selects a maximum value of the voltage difference values and a maximum value of the current difference values stored in the first memory unit, or selects a minimum value of the voltage difference values and a minimum value of the current difference values stored in the first memory unit;
a second memory unit that stores the voltage difference values and the current difference values selected by the selection unit; and
a first operation unit that calculates a covariance value of the voltage difference values and the current difference values stored in the second memory unit, and a variance value of the current difference values stored in the second memory unit, and estimates an internal resistance of the battery using the covariance value and the variance values.
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Accused Products
Abstract
A device for estimating an internal resistance of a battery and a battery pack including the same. The device stores voltage difference values between sampled voltage values and current difference values between sampled current values for a predetermined period of time, periodically selects a maximum value or a minimum value of stored voltage difference values and a maximum value or a minimum value of the stored current difference values, calculates a covariance value and a variance value of the selected voltage difference values and the selected current difference values, and estimates the internal resistance of the battery based on the calculated covariance value and variance value.
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Citations
20 Claims
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1. A device for estimating internal resistance of a battery, comprising:
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a first memory unit that stores voltage difference values between sampled voltage values and current difference values between sampled current values for a predetermined period of time; a selection unit that periodically selects a maximum value of the voltage difference values and a maximum value of the current difference values stored in the first memory unit, or selects a minimum value of the voltage difference values and a minimum value of the current difference values stored in the first memory unit; a second memory unit that stores the voltage difference values and the current difference values selected by the selection unit; and a first operation unit that calculates a covariance value of the voltage difference values and the current difference values stored in the second memory unit, and a variance value of the current difference values stored in the second memory unit, and estimates an internal resistance of the battery using the covariance value and the variance values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 18)
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11. A battery pack, comprising:
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a battery including a plurality of battery cells connected to each other in series; and a battery management unit that samples data of voltage and current values of the battery and estimates an internal resistance of the battery using the sampled data, wherein the battery management unit comprises; a first memory unit that stores voltage difference values between sampled voltage values and current difference values between sampled current values for a predetermined period of time; a selection unit that periodically selects a maximum value of the voltage difference values and a maximum value of the current difference values stored in the first memory unit or selects a minimum value of the voltage difference values and a minimum value of the current difference values stored in the first memory unit; a second memory unit that stores the voltage difference values and the current difference values selected by the selection unit; and a first operation unit that calculates a covariance value of the voltage difference values and the current difference values stored in the second memory unit, and a variance value of the current difference values stored in the second memory unit, and estimates an internal resistance of the battery using the covariance value and the variance values. - View Dependent Claims (12, 13, 14, 15, 16, 17, 19, 20)
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Specification