| CPC G01R 31/389 (2019.01) [G01R 31/382 (2019.01); G01R 31/396 (2019.01); H01M 10/4235 (2013.01); H01M 10/48 (2013.01); H02J 7/0047 (2013.01)] | 7 Claims |
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1. A battery monitoring system for monitoring a state of a storage battery composed of an electrolyte and multiple electrodes, the battery monitoring system being implemented in a transportation system and comprising:
a signal controller configured to cause the storage battery to output an AC signal as a response signal, the storage battery outputting the AC signal based on its own power;
a lock-in amplifier configured to receive the response signal from the storage battery; and
a processor configured to:
designate a waveform of the AC signal to be output by the storage battery, the waveform defining a reference frequency used in measuring a complex impedance of the storage battery;
determine whether the reference frequency is within a predetermined range of noise signal frequencies;
when the reference frequency is not within the predetermined range of noise signal frequencies,
cause the storage battery to output the AC signal as the response signal,
cause the lock-in amplifier to perform a lock-in detection to detect a frequency component included in the response signal at the reference frequency, and
calculate a complex impedance of the storage battery based on the detected frequency component in the response signal,
when the reference frequency is within the predetermined range of noise signal frequencies,
before the signal controller causes the storage battery to output the AC signal as the response signal, cause the lock-in amplifier to perform a lock-in detection to detect a frequency component included in a first signal at the reference frequency, and
determine whether the first signal is a noise signal based on a determination of whether the frequency component of the first signal satisfies a first threshold value, and
when the frequency component of the first signal satisfies the first threshold value, the first signal is a noise signal occurring a first time, and the processor is further configured to:
after the signal controller causes the storage battery to output the AC signal as the response signal, cause the lock-in amplifier to perform a lock-in detection to detect a frequency component of the response signal including the noise signal;
cause the lock-in amplifier to perform a lock-in detection to detect a frequency component included in a second signal, the second signal being a noise signal at a second time, which is after the first time;
compare the frequency component of the first signal with the frequency component of the second signal;
when a difference between the frequency component of the first signal and the frequency component of the second signal satisfies a second threshold value, either avoid or remove the noise signal; and
calculate the complex impedance of the storage battery based on the frequency component detected in the response signal upon removal or avoidance of the noise signal.
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