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Title:
IMPEDANCE MEASUREMENT DEVICE AND IMPEDANCE MEASUREMENT METHOD
Document Type and Number:
WIPO Patent Application WO/2022/270104
Kind Code:
A1
Abstract:
Provided is an impedance measurement device that is capable of measuring the internal impedance of a battery under measurement that is connected in parallel to a load.　This impedance measurement device comprises a current source 2 for supplying an AC current Iac to a circuit network NW1, a current measurement circuit 3 for detecting the AC current Iac flowing through a battery Bat1 as a current detection signal Si, a voltage measurement circuit 4 for detecting the voltage Vb generated between the ends of the battery Bat1 as a voltage detection signal Sv, and a processing unit 5 for measuring the internal impedance Zb of the battery Bat1 on the basis of the current detection signal Si and voltage detection signal Sv. The current detection circuit 3 comprises an ammeter 31 that is capable of measuring the AC current Iac flowing through the circuit network NW1, a clamp-type ammeter 32 that is capable of measuring the AC current Iac flowing through the loads Load1, Load2, and a differential current value detection circuit 33 that detects, as the current detection signal Si, a differential current value obtained by subtracting the current value measured by the ammeter 32 from the current value measured by the ammeter 31.

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Inventors:
IIJIMA JUNJI (JP)
Application Number:
PCT/JP2022/015375
Publication Date:
December 29, 2022
Filing Date:
March 29, 2022
Export Citation:
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Assignee:
HIOKI ELECTRIC WORKS (JP)
International Classes:
G01R27/02; G01R31/389
Domestic Patent References:
WO2019092794A12019-05-16
Foreign References:
JPH03274479A1991-12-05
JPH0954147A1997-02-25
JP2020016493A2020-01-30
JP2013019832A2013-01-31
JP2017060316A2017-03-23
JP2009126642A2009-06-11
JP2017118642A2017-06-29
JP2000299137A2000-10-24
Attorney, Agent or Firm:
SAKAI Shinji (JP)
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