DIAGNOSIS DEVICE AND DIAGNOSIS METHOD
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Abstract
An impedance measuring device includes power supply means configured to output an alternating current to a positive electrode and a negative electrode of a laminated battery and detection means configured to detect at least one of an alternating-current potential difference between the positive electrode and an intermediate point of the laminated battery and an alternating-current potential difference between the negative electrode and the intermediate point of the laminated battery. The impedance measuring device includes computation means configured to compute an impedance of the laminated battery on the basis of the alternating-current potential difference detected by the detection means and the alternating current output from the power supply means, and an element having an impedance of a prescribed value necessary to calculate a measurement error of the impedance. The impedance measuring device includes switch means configured to alternately switch a battery connection state for connecting the power supply means and the detection means to the laminated battery and an element connection state for cutting off connection to the laminated battery and connecting the power supply means and the detection means to the element. The computation means computes an impedance of the element and diagnoses a measurement state of the laminated battery or corrects the impedance of the laminated battery when the switch means is switched to the element connection state.
7 Citations
27 Claims
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1-14. -14. (canceled)
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15. A diagnosis device, comprising:
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a power supply unit configured to output an alternating current for measuring an impedance of a laminated battery to a positive electrode and a negative electrode of the laminated battery, a plurality of battery cells being laminated in the laminated battery; a detection unit configured to detect at least one of an alternating-current potential difference between the positive electrode and an intermediate point of the laminated battery and an alternating-current potential difference between the negative electrode and the intermediate point; a computation unit configured to compute the impedance of the laminated battery on the basis of the alternating-current potential difference detected by the detection unit and the alternating current output from the power supply unit; a diagnosis element having a predetermined impedance reference value and necessary to calculate a measurement error of the impedance; and a switch unit configured to alternately switch a battery connection state for connecting the power supply unit and the detection unit to the laminated battery and a diagnosis element connection state for cutting off connection to the laminated battery and connecting the power supply unit and the detection unit to the diagnosis element; the computation unit measuring an impedance of the diagnosis element, calculating a difference between a measurement value of the impedance of the diagnosis element and the impedance reference value as a measurement error and diagnosing a measurement state of the laminated battery on the basis of the measurement error when the switch unit is switched to the diagnosis element connection state. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A diagnosis method implemented in a diagnosis device which comprises:
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power supply unit configured to output an alternating current for measuring an impedance of a laminated battery to a positive electrode and a negative electrode of the laminated battery, a plurality of battery cells being laminated in the laminated battery; detection unit configured to detect at least one of an alternating-current potential difference between the positive electrode and an intermediate point of the laminated battery and an alternating-current potential difference between the negative electrode and the intermediate point; a diagnosis element having a predetermined impedance reference value and necessary to calculate a measurement error of the impedance; and switch unit configured to alternately switch a battery connection state for connecting the power supply unit and the detection unit to the laminated battery and a diagnosis element connection state for cutting off connection to the laminated battery and connecting the power supply unit and the detection unit to the diagnosis element; the diagnosis method comprising; a battery computation step of computing the impedance of the laminated battery on the basis of the alternating-current potential difference detected by the detection unit and the alternating current output from the power supply unit when the switch unit is switched to the battery connection state; and a processing step of measuring an impedance of the diagnosis element, calculating a difference between a measurement value of the impedance of the diagnosis element and the impedance reference value as a measurement error and diagnosing a measurement state of the laminated battery on the basis of the measurement error when the switch unit is switched to the diagnosis element connection state.
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Specification