Apparatus and method for estimating state of charge of secondary battery
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United States of America
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Jun 28, 2022
Grant Date -
Feb 25, 2021
app pub date -
Sep 9, 2018
filing date -
Sep 9, 2018
priority date (Note) -
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Abstract
Provided is an apparatus and method for estimating a state of charge of a secondary battery. The apparatus includes a sensor unit configured to measure a voltage and a current of the secondary battery in a predetermined cycle, and a control unit operably coupled to the sensor unit. The control unit is configured to estimate the state of charge of the secondary battery in the predetermined cycle based on the voltage and the current measured by the sensor unit. The control unit is further configured to determine an operating state of the secondary battery as any one of a linear operating state and a non-linear operating state based on a threshold voltage and the measured voltage, and then determine first process noise indicating inaccuracy of a current integration model and second process noise indicating inaccuracy of an equivalent circuit model according to the determined operating state.
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