Internal Impedance Detecting Apparatus, Internal Impedance Detecting Method, Degradation Degree Detecting Apparatus, and Degradation Degree Detecting Method
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Abstract
An internal impedance detecting apparatus for detecting the internal impedance of a secondary battery with high accuracy is provided. Processor 106 divides the variation of each voltage detected by voltage change detector 103 by the variation of the current detected by current change detector 105 for the same detecting time as that for the voltage variations to compute the internal impedances. Judging unit 107 checks the variations of the internal impedances computed by processor 106 and judges from the check result whether or not the internal impedances have reliability. Only when judging unit 107 judges that the internal impedances have reliability, generator 109 generates output internal impedance according to the internal impedances.
29 Citations
36 Claims
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1-18. -18. (canceled)
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19. An internal impedance detecting apparatus for detecting an internal impedance of a secondary battery, comprising:
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a voltage detector for detecting a voltage of said secondary battery; a voltage change detector for detecting a change in the voltage within each of a plurality of detection times which have respective different time durations and include a common time, based on the voltage detected by said voltage detector; a current detector for detecting a current flowing through said secondary battery; a current change detector for detecting a change in the current within each of said detection times based on the current detected by said current detector; a processor for calculating a plurality of internal impedances by dividing voltage changes detected by said voltage change detector by current changes detected by said current change detector at the same detection times as the voltage changes; a judging unit for judging whether the internal impedances are reliable or not based on variations of the internal impedances calculated by said processor; and a generator for generating an internal impedance to be output based on the internal impedances only if said judging unit judges that said internal impedances are reliable. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. A degradation degree detecting apparatus for detecting a degradation degree of a secondary battery, comprising:
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an internal impedance detecting apparatus comprising a voltage detector for detecting a voltage of said secondary battery;
a voltage change detector for detecting a change in the voltage within each of a plurality of detection times which have respective different time durations and include a common time, based on the voltage detected by said voltage detector;
a current detector for detecting a current flowing through said secondary battery;
a current change detector for detecting a change in the current within each of said detection times based on the current detected by said current detector;
a processor for calculating a plurality of internal impedances by dividing voltage changes detected by said voltage change detector by current changes detected by said current change detector at the same detection times as the voltage changes;
a judging unit for judging whether the internal impedances are reliable or not based on variations of the internal impedances calculated by said processor; and
a generator for generating an internal impedance to be output based on the internal impedances only if said judging unit judges that said internal impedances are reliable;a temperature detector for detecting the temperature of said secondary battery; an SOC detector for detecting the SOC of said secondary battery; a corrector for correcting the internal impedance to be output which has been generated by said internal impedance detecting apparatus, based on the temperature detected by said temperature detector and the SOC detected by said SOC detector; and a degradation degree detector for detecting a degradation degree of said secondary battery based on the internal impedance to be output which has been corrected by said corrector.
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28. A method of detecting an internal impedance of a secondary battery, comprising the steps of:
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detecting a voltage of said secondary battery; detecting a change in the voltage within each of a plurality of detection times which have respective different time durations and include a common time, based on the voltage detected in said step of detecting a voltage; detecting a current flowing through said secondary battery; detecting a change in the current within each of said detection times based on the current detected in said step of detecting a current; calculating a plurality of internal impedances by dividing voltage changes detected in said step of detecting a change in the voltage by current changes detected in said step of detecting a change in the current at the same detection times as the voltage changes; judging whether the internal impedances are reliable or not based on variations of the internal impedances calculated in said step of calculating a plurality of internal impedances; and
generating an internal impedance to be output based on the internal impedances only if it is judged in said step of judging that said internal impedances are reliable. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
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36. A method of detecting a degradation degree of a secondary battery, comprising the steps of:
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detecting a voltage of said secondary battery; detecting a change in the voltage within each of a plurality of detection times which have respective different time durations and include a common time, based on the voltage detected in said step of detecting a voltage; detecting a current flowing through said secondary battery; detecting a change in the current within each of said detection times based on the current detected in said step of detecting a current; calculating a plurality of internal impedances by dividing voltage changes detected in said step of detecting a change in the voltage by current changes detected in said step of detecting a change in the current at the same detection times as the voltage changes; judging whether the internal impedances are reliable or not based on variations of the internal impedances calculated in said step of calculating a plurality of internal impedances; generating an internal impedance to be output based on the internal impedances only if it is judged in said step of judging that said internal impedances are reliable; detecting the temperature of said secondary battery; detecting the SOC of said secondary battery; correcting the internal impedance to be output, based on the temperature detected in said step of detecting the temperature and the SOC detected in said step of detecting the SOC; and detecting a degradation degree of said secondary battery based on the internal impedance to be output which has been corrected in said step of correcting an internal impedance to be output.
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Specification