METHOD, APPARATUS AND COMPUTER PROGRAM FOR DETERMINING AN IMPEDANCE OF AN ELECTRICALLY CONDUCTING DEVICE

WIPO Patent Application WO/2019/025574

A8

The invention relates to a method for determining an impedance of an electrically conducting device (11), such as a battery or a welded metal joint, comprising the steps of: - applying a time-varying electric current (301 ) to the electrically conducting device (11), wherein the current (301 ) varies at least between a first level (31, 311) and a second level (33, 331), wherein the current (301 ) changes between the first level (31, 311) and second level (33, 331) within a time interval (302), wherein said time interval (302) is so short that a voltage response (39) of the electrically conducting device (11) exhibits a first local voltage extremum (36, 361 ) followed by a decay (364), wherein an ohmic resistance voltage (342) is adopted by the voltage response (39), when the first local voltage extremum (36, 361 ) has decayed, - acquiring the voltage response (39) at least partially, determining an impedance of the electrically conducting device (11) from the acquired voltage response (39).

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HUBER CHRISTIAN (DE)
HORSCHE MAX (DE)
BRAND MARTIN (DE)
SCHMIDT KORBINIAN (DE)

PCT/EP2018/071084

July 18, 2019

August 02, 2018

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LI PLUS GMBH (DE)

G01R31/36; G01R27/08

BOLSINGER, Jens (DE)

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