DEVICE FOR CALCULATING IMPEDANCES OF BATTERY CELL AND BATTERY IMPEDANCE MEASURING SYSTEM
First Claim
1. A device for calculating impedances of a battery cell for respective frequency domains, the device comprising:
- a Fourier transformation calculator configured to perform Fourier transformation on voltage waveform data and current waveform data, which are output from the battery cell, and calculate an impedance of the battery cell by dividing a Fourier transformation data of the voltage waveform data by a Fourier transformation data of the current waveform data;
a circuit constant estimator configured to estimate circuit constants of a predetermined equivalent circuit model of the battery cell, based on the impedance calculated by the Fourier transformation calculator; and
an impedance estimator configured to estimate impedances of the battery cell for respective frequency domains, based on the estimated circuit constants and the equivalent circuit mode.
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Abstract
There is provided a device for calculating impedances of a battery cell for respective frequency domains. The device includes: a Fourier transformation calculator configured to perform Fourier transformation on voltage waveform data and current waveform data, which are output from the battery cell, and calculate an impedance of the battery cell by dividing a Fourier transformation data of the voltage waveform data by a Fourier transformation data of the current waveform data; a circuit constant estimator configured to estimate circuit constants of a predetermined equivalent circuit model of the battery cell, based on the impedance calculated by the Fourier transformation calculator; and an impedance estimator configured to estimate impedances of the battery cell for respective frequency domains, based on the estimated circuit constants and the equivalent circuit mode.
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Citations
11 Claims
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1. A device for calculating impedances of a battery cell for respective frequency domains, the device comprising:
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a Fourier transformation calculator configured to perform Fourier transformation on voltage waveform data and current waveform data, which are output from the battery cell, and calculate an impedance of the battery cell by dividing a Fourier transformation data of the voltage waveform data by a Fourier transformation data of the current waveform data; a circuit constant estimator configured to estimate circuit constants of a predetermined equivalent circuit model of the battery cell, based on the impedance calculated by the Fourier transformation calculator; and an impedance estimator configured to estimate impedances of the battery cell for respective frequency domains, based on the estimated circuit constants and the equivalent circuit mode. - View Dependent Claims (3, 5, 6)
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2. A device for calculating impedances of a battery cell for respective frequency domains, the device comprising:
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a Fourier transformation calculator configured to perform Fourier transformation on voltage waveform data and current waveform data, which are output from the battery cell, and calculate an impedance of the battery cell by dividing a Fourier transformation data of the voltage waveform data by a Fourier transformation data of the current waveform data; a circuit model selector configured to select a certain equivalent circuit model from among a plurality of equivalent circuit model, based on the impedance calculated by the Fourier transformation calculator; and a circuit constant estimator configured to estimate circuit constant of the selected equivalent circuit model, based on the impedance calculated by the Fourier transformation calculator. - View Dependent Claims (4)
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7. A battery impedance measuring system, comprising:
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a battery module comprising a plurality of battery cells and configured to provide power to a load; a plurality of devices each provided for a corresponding one of the battery cells to calculate impedances of the corresponding battery cell for respective frequency domains, each of the devices comprising; a Fourier transformation calculator configured to perform Fourier transformation on voltage waveform data and current waveform data, which are output from the corresponding battery cell, and calculate an impedance of the corresponding battery cell by dividing a Fourier transformation data of the voltage waveform data by a Fourier transformation data of the current waveform data; a circuit constant estimator configured to estimate circuit constants of a predetermined equivalent circuit model of the corresponding battery cell, based on the impedance calculated by the Fourier transformation calculator; and an impedance estimator configured to estimate impedances of the corresponding battery cell for respective frequency domains, based on the estimated circuit constants and the equivalent circuit mode.
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8. A battery impedance measuring system, comprising:
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a battery module comprising a plurality of battery cells and configured to provide power to a load; a plurality of devices each provided for a corresponding one of the battery cells to calculate impedances of the corresponding battery cell for respective frequency domains, each of the devices comprising; a Fourier transformation calculator configured to perform Fourier transformation on voltage waveform data and current waveform data, which are output from the corresponding battery cell, and calculate an impedance of the corresponding battery cell by dividing a Fourier transformation data of the voltage waveform data by a Fourier transformation data of the current waveform data; a circuit model selector configured to select a certain equivalent circuit model from among a plurality of equivalent circuit model, based on the impedance calculated by the Fourier transformation calculator; and a circuit constant estimator configured to estimate circuit constant of the selected equivalent circuit model, based on the impedance calculated by the Fourier transformation calculator.
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9. A battery monitoring device for real-time measurement, which monitors a battery module comprising a plurality of battery cells connected to each other in series, the device comprising:
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a plurality of power and impedance calculators each provided for a corresponding one of the battery cells, and each configured to receive a voltage signal and a current signal from the corresponding battery cell and to measure an instantaneous power value and an internal impedance characteristic of the corresponding battery cell; and a battery module state manager configured to receive output data of the respective power and impedance calculators via an internal bus. - View Dependent Claims (10, 11)
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Specification