APPARATUS AND METHOD FOR ESTIMATING DEGREE OF AGING OF SECONDARY BATTERY
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United States of America Patent
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Aug 22, 2016
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Aug 21, 2015
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Abstract
An apparatus for estimating a degree of aging of a secondary battery is configured to: determine a current and a temperature of the secondary battery; determine a state of charge from the current of the secondary battery; determine a degree of calendar aging by applying a cumulative degree-of-aging model to a degree-of-calendar-aging profile corresponding to the determined state of charge and the determined temperature while the secondary battery is in a calendar state; determine a degree of cycle aging by applying the cumulative degree-of-aging model to a degree-of-cycle-aging profile corresponding to the state of charge, the temperature, and the current of the secondary battery while the secondary battery is in a cycle state; and determine, as the degree of aging of the secondary battery, a weighted average value calculated for the determined degree of calendar aging and the determined degree of cycle aging based on calendar time and cycle time.
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