Precise cell impedance measurement in fuel cells

How can complex electrochemical processes in fuel cell stacks be analysed efficiently and precisely? This question was addressed in the FullStack TS research project, which SMART TESTSOLUTIONS carried out in collaboration with MS2 Engineering & Anlagenbau GmbH and Fraunhofer ISE.

The result: a test bench for full fuel cell stacks with up to 200 kW of power, designed for applications in trucks, trains and aviation. It also includes an electrical impedance spectroscopy (EIS) system, the heart of which is our new MCM measurement module IntelliProbe U02 AC. As part of the modular EIS system, the module measures the AC voltage response of individual cells to sinusoidal current excitations – multi-channel, time-synchronous and highly accurate.

What makes the IntelliProbe U02 AC special?

• Two galvanically isolated measurement channels per module
• Compact, stackable form factor (IP54)
• High voltage isolation (up to 1000 V)
• Frequency range from 0.1 Hz to 2 kHz
• Robust operation even in climate chambers (-40 to +105 °C)

Up to 60 modules can be combined into a stack, supplemented by link and master modules for data processing and communication via Ethernet and CAN bus.

EIS in practice: real-time insights into cell processes

Electrochemical impedance spectroscopy allows the analysis of cell behaviour across different frequencies. This enables the targeted investigation of membrane moisture, degradation mechanisms or other physical-chemical processes, for example – a decisive advantage for the development and validation of fuel cell systems.

Conclusion

With the IntelliProbe U02 AC, SMART TESTSOLUTIONS offers a powerful solution for multi-channel high-voltage measurement technology in demanding EIS applications. Whether in research or industry, precise cell impedance measurement becomes more efficient and scalable.