Patent ID: 9529055
Filing Date: 2016-12-27
CPC Classification: G01R,H01M,Y02E,Y02P

Claim Text:
1. An impedance measuring device for a laminated battery, comprising: an AC power supply unit configured to output an alternating current to an impedance measured object, the impedance measured object including at least a laminated battery; an AC potential difference detecting unit configured to detect at least one of a positive-electrode side AC potential difference or a negative-electrode side AC potential difference, the positive-electrode side AC potential difference being a potential difference between a potential on a positive electrode side of the impedance measured object and an intermediate potential of the impedance measured object, the negative-electrode side AC potential difference being a potential difference between a potential on a negative electrode side of the impedance measured object and an intermediate potential of the impedance measured object; an impedance computing unit configured to compute an impedance of the laminated battery on the basis of the at least one AC potential difference and the alternating current applied to the impedance measured object; a filter configured to remove a signal with a measurement frequency of an AC signal from the AC signal having a measurement component at the measurement frequency, the AC signal indicating the AC potential difference on one electrode side opposite to that of the AC potential difference used by the impedance computing unit; and an adding unit configured to add a filtered signal to the AC signal, the filtered signal being a signal after passing through the filter, the AC signal indicating the AC potential difference used by the impedance computing unit.