US 11,927,663 B2
Impedance standard
Thomas Hammerschmidt, Unterschleissheim (DE); Ulrich Roth, Kolbermoor (DE); Jan Philipp Schmidt, Holzmaden (DE); Martin Stanglmaier, Au in der Halltertau (DE); and Christian Steinbauer, Zandt (DE)
Assigned to Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
Appl. No. 17/594,067
Filed by Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
PCT Filed Mar. 26, 2020, PCT No. PCT/EP2020/058538
§ 371(c)(1), (2) Date Oct. 1, 2021,
PCT Pub. No. WO2020/201007, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 10 2019 108 920.4 (DE), filed on Apr. 4, 2019.
Prior Publication US 2022/0163613 A1, May 26, 2022
Int. Cl. G01R 35/00 (2006.01); G01R 31/389 (2019.01); G01R 31/396 (2019.01)
CPC G01R 35/007 (2013.01) [G01R 31/389 (2019.01); G01R 31/396 (2019.01)] 11 Claims
OG exemplary drawing
 
1. A calibration method for an electrochemical impedance measuring device that is provided for measuring an impedance of an electrochemical cell, the method comprising:
(a) connecting the impedance measuring device to an impedance normal that has at least two excitation connections for feeding in an excitation signal and two measurement connections for determining a measurement signal, and that has a fixed or variable impedance that corresponds to an impedance setpoint value ZSoll;
(b) applying a voltage signal UEin to the excitation connections and measuring the current IAus flowing through the impedance normal on account of the voltage signal UEin at the measurement connections; or supplying a current signal IEin to the excitation connections and measuring the voltage drop UAus at the measurement connections; and
(c) calibrating the impedance measuring device against the impedance normal to the impedance ZSoll using Z=UEin/IAus=ZSoll or Z=UAus/IEin=ZSoll,
wherein a geometric arrangement of the excitation connections and the measurement connections of the impedance normal corresponds to a geometric arrangement of connections of the electrochemical cell for which the impedance is to be measured, as a result of which the impedance normal can be contact-connected to the impedance measuring device in a same arrangement as the electrochemical cell.