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Impedance standard

A standard and impedance measurement technology, applied in the direction of measuring resistance/reactance/impedance, measuring devices, instruments, etc., can solve problems that cannot be used for calibrating test benches

Pending Publication Date: 2021-11-05
BAYERISCHE MOTOREN WERKE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calibration via a geometrically arbitrarily designed impedance standard can therefore lead to results that depend on the cable routing or connector position
Therefore, this impedance standard cannot be used to calibrate test benches for samples with low ohm impedance

Method used

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Embodiment Construction

[0018] Impedance measuring device

[0019] The method according to the invention can be used for any impedance measuring device which is provided for impedance measurement or impedance spectroscopy (EIS) of chemically current-generating battery cells, in particular lithium-ion battery cells. For example, it can be a test bench measuring device or a measuring device permanently installed in an electrically operated vehicle for online diagnostics.

[0020] The measuring device has at least one output for an excitation signal (source) and an input for a measurement signal (sense), which in turn each comprise two connections (source+ and source- or sense+ and sensing part-). In principle, the source signal can be a voltage signal or a current signal, and correspondingly, the sensing signal is a current signal or a voltage signal. Preferably, a current signal is used as source signal (galvanostatic measurement).

[0021] The measurement frequency is not particularly limited and ...

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Abstract

The invention relates to a calibration method for an electrochemical impedance measuring device which is provided for measuring the impedance of an electrochemical cell, in particular a lithium ion cell, the method comprising the following steps: (a) connecting the impedance measuring device to an impedance standard which has at least two excitation terminals (A1, A2) for feeding an excitation signal and two measuring terminals (M1, M2) for determining a measurement signal, and which has a fixed or adjustable impedance which corresponds to an impedance set value ZSoll; (b) applying a voltage signal UEin to the excitation terminals and measuring the current IAUS flowing through the impedance standard due to UEin at the measuring terminals; or supplying a current signal IEin to the excitation terminals and measuring the dropping voltage UAUS at the measuring terminals; and (c) calibrating the impedance measuring device against the impedance standard to the impedance ZSoll using Z = UEin / IAUS = ZSoll and Z = UAUS / IEin = ZSoll, characterized in that the geometrical arrangement of terminals A1, A2, M1, M2 of the impedance standard corresponds to the geometrical arrangement of the terminals of the cell of which impedance is to be measured, such that the impedance standard can be contacted with the impedance measuring device in the same arrangement as the cell. Furthermore, the invention relates to an impedance standard for carrying out the method.

Description

technical field [0001] The invention relates to a method for using an impedance standard to calibrate an impedance measuring device for a chemically current-generating battery cell and to a corresponding impedance standard. Background technique [0002] Electrochemical impedance spectroscopy (EIS) is a well-established method for characterizing electrochemical systems, especially battery cells that chemically generate electrical current. The prior art also teaches the use of impedance measurements to diagnose the state of Li-ion battery cells in the automotive field. [0003] Impedance measurement can be performed by applying a predetermined AC voltage signal U(t) to the battery cell and measuring the resulting AC current I(t), or by supplying a predetermined AC current signal I(t) and measuring the resulting current in the battery cell. The AC voltage U(t) that falls on the body is carried out. The impedance Z is generally complex and results in both cases as Z=U(t) / I(t)....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/396G01R31/389G01R31/378G01R31/36G01R31/00
CPCG01R31/396G01R31/389G01R31/378G01R31/3648G01R31/006G01R35/007Y02E60/10G01R27/02G01R27/08
Inventor C·斯泰因鲍尔U·罗特M·施坦格尔迈尔T·哈默施密特J·P·施密特
Owner BAYERISCHE MOTOREN WERKE AG