Reducing or avoiding noise in measured signals of a tested battery cell(s) in a battery power system used to determine state of health (SOH)
First Claim
1. A battery monitoring device for testing at least one battery cell in a battery power system, comprising:
- a test current circuit configured to;
receive a test frequency setting signal indicating a test frequency setting; and
apply a test current pulse at a test frequency based on the test frequency setting in the received test frequency setting signal to at least one battery cell, to place an effective alternating current (AC) load on the at least one battery cell;
a demodulation circuit configured to;
receive an AC voltage signal generated across the at least one battery cell as a result of the test current pulse applied to the at least one battery cell;
convert the received AC voltage signal to a direct current (DC) voltage signal indicative of a state-of-health (SOH) of the at least one battery cell based on a sampling frequency; and
measure the voltage of the DC voltage signal to determine the SOH of the at least one battery cell;
a noise detecting circuit configured to;
determine a noise spectrum of the at least one battery cell; and
generate the test frequency setting signal indicating the test frequency setting based on the determined noise spectrum as the test frequency setting.
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Accused Products
Abstract
Reducing or avoiding noise in measured signals of a tested battery cell(s) in a battery power system is disclosed. A battery monitoring device(s) coupled to a tested battery cell(s) applies test current pulses at a predetermined frequency to place an effective alternating current (AC) load on the tested battery cell(s). The resulting AC voltage signal generated across the tested battery cell(s) is sampled at the frequency of the test current to convert the AC voltage signal to a direct current (DC) voltage signal to be measured to determine the state-of-health of the tested battery cell(s). To avoid or reduce noise in the DC voltage signal, a noise spectrum of noise signals at defined frequencies induced on the tested battery cell(s) is determined. The battery monitoring device sets the frequency of the test current pulse at a determined reduced-noise frequency to avoid noise signals being present in the DC voltage signal.
9 Citations
37 Claims
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1. A battery monitoring device for testing at least one battery cell in a battery power system, comprising:
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a test current circuit configured to; receive a test frequency setting signal indicating a test frequency setting; and apply a test current pulse at a test frequency based on the test frequency setting in the received test frequency setting signal to at least one battery cell, to place an effective alternating current (AC) load on the at least one battery cell; a demodulation circuit configured to; receive an AC voltage signal generated across the at least one battery cell as a result of the test current pulse applied to the at least one battery cell; convert the received AC voltage signal to a direct current (DC) voltage signal indicative of a state-of-health (SOH) of the at least one battery cell based on a sampling frequency; and measure the voltage of the DC voltage signal to determine the SOH of the at least one battery cell; a noise detecting circuit configured to; determine a noise spectrum of the at least one battery cell; and generate the test frequency setting signal indicating the test frequency setting based on the determined noise spectrum as the test frequency setting. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of testing at least one battery cell in a battery power system, comprising:
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applying a test current pulse at a test frequency based on a test frequency setting in a received test frequency setting signal to at least one battery cell, to place an effective alternating current (AC) load on the at least one battery cell; receiving an AC voltage signal generated across the at least one battery cell as a result of the test current pulse applied to the at least one battery cell; converting the received AC voltage signal to a direct current (DC) voltage signal indicative of a state-of-health (SOH) of the at least one battery cell based on a sampling frequency; measuring the voltage of the DC voltage signal to determine the SOH of the at least one battery cell; determining a noise spectrum of the at least one battery cell; and generating the test frequency setting signal indicating the test frequency setting based on the determined noise spectrum as the test frequency setting. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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29. A non-transitory computer-readable medium having stored thereon computer-executable instructions to cause a processor to implement a method for testing at least one battery cell in a battery power system, comprising:
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applying a test current pulse at a test frequency based on a test frequency setting in a received test frequency setting signal to at least one battery cell, to place an effective alternating current (AC) load on the at least one battery cell; receiving an AC voltage signal generated across the at least one battery cell as a result of the test current pulse applied to the at least one battery cell; converting the received AC voltage signal to a direct current (DC) voltage signal indicative of a state-of-health (SOH) of the at least one battery cell based on a sampling frequency; measuring the voltage of the DC voltage signal to determine the SOH of the at least one battery cell; determining a noise spectrum of the at least one battery cell; and generating the test frequency setting signal indicating the test frequency setting based on the determined noise spectrum as the test frequency setting.
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30. A battery monitoring system for testing battery cells in a battery power system, comprising:
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a plurality of battery monitoring devices, each battery monitoring device configured to be coupled to a subset of a plurality of battery cells electrically connected in series to form a battery, wherein each battery monitoring device comprises a plurality of current leads configured to be coupled to the subset of the plurality of battery cells assigned to the battery monitoring device to; apply a test current pulse at a test frequency based on a test frequency setting in a received test frequency setting signal to the subset of the plurality of battery cells, to place an effective alternating current (AC) load on the subset of the plurality of battery cells; receive an AC voltage signal generated across the subset of the plurality of battery cells as a result of the test current pulse applied to the subset of the plurality of battery cells; and convert the received AC voltage signal to a direct current (DC) voltage signal indicative of a state-of-health (SOH) of the subset of the plurality of battery cells based on a sampling frequency; wherein each battery monitoring device further comprises a plurality of voltage leads configured to be coupled to the subset of the plurality of battery cells assigned to the battery monitoring device to measure the voltage of the DC voltage signal to determine the SOH of the subset of the plurality of battery cells; a battery monitoring system control unit configured to; control each battery monitoring device among the plurality of battery monitoring devices to test a subset of the plurality of battery cells coupled to the battery monitoring device; and receive at least one battery current measurement from each battery monitoring device among the plurality of battery monitoring devices indicating the SOH of the subset of the plurality of battery cells coupled to the battery monitoring device; at least one battery monitoring device among the plurality of battery monitoring devices, configured to; determine a noise spectrum of the subset of the plurality of battery cells coupled to the at least one battery monitoring device; and generate the test frequency setting signal indicating the test frequency setting based on the determined noise spectrum as the test frequency setting. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37)
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Specification