BRS 電池檢測-德國工業技術

Examples Battery Quality right from the start

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General Details



Battery Quality right from the start

Unequal cells lead to unequal stress and therefore cause

unequal ageing in battery systems.

By measuring the complete impedance curve you make sure
that only equal battery cells are grouped together into modules (packs).


Quality reports within seconds
Determine state of health of battery

The battery capacity declines with working life,
the internal resistance increases.

By measuring the internal resistance you can determine
the state of health within seconds.

Range of use

Our broad range of customers, from A (Audi) to Z (ZSW), reflects the versatility of our products. Our devices are successfully applied at:


  • Emergency power, UPS
  • Buffer storage


  • Vehicles, ships
  • Aerospace sector


  • Medical instruments
  • Power tools


  • Research and education
  • Test labs

Range of use of iur battery testers

Fundamentals of Spectral Impedance

The internal resistance of a battery is strongly frequency dependent: it decreases with increasing frequency and exhibits reactive components. Therefore it is called spectral impedance which is depicted either per magnitude and phase (and graphically as Bode plot) or per real part and imaginary part (and graphically as Nyquist plot).


Ortskurve Spektrale Impedanzmesstechnik

A purely ohmic behaviour only exists at one frequency which typically lies in the range of 1kHz, depending on technology and capacity. This so-called AC resistance is typically specified in the data sheets, for the sake of convenience at a fixed frequency of 1kHz. It is measured by imposing a small AC current onto the battery and measuring the resulting AC voltage. The measurement takes around 1 sec.

During operation such fast changes of currents are quite unusual; therefore in order to evaluate the operational behavior, the DC resistance is more appropriate. This is done by measuring the impedance at a lower frequency, typically <1Hz (or in the time domain as step response). Both measurements (AC and DC resistance) take only a few seconds.

The most comprehensive insight into the battery behavior is gained by spectral impedance measurements (also called electrical impedance spectroscopy EIS). Here the (complex) impedance is measured at multiple frequencies (e.g. between 0.1Hz and 1kHz), with a measurement duration of several minutes or longer. The frequency response or the Nyquist plot shows the electrochemical behavior. For instance, if the curve deviates considerably from a typical behavior, damages can be concluded.

The table below shows an overview of common measurement parameters:

Measurement Parameter

Battery Behavior

R & D





State of charge (SoC)
(Li-Ion, lead)

AC resistance

Ageing (SoH)

DC resistance

Operational behavior

Nyquist plot
(Impedance Spectrum)

Operational behavior, Damages,
Model parameters





Selection, grading

Examination and exchange


Reference values

are to be determined

Existing cells

Adjacent cells

Data sheet or initial data




# 項目 數值
1 電壓範圍
2 電流範圍
3 最小電壓解析度
4 最小電流解析度
5 交流阻抗
6 頻道數

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