Fuel Cell Stack Measuring Device - ALDAS-E

HIOKI E.E. CORPORATION

High-speed EIS measurement with a minimum time of 7.6 minutes (conditions: 10 kHz to 0.01 Hz, 30 points, fast mode)
Multi-channel measurement expandable from 1 to 48 channels, enabling simultaneous tracking of total stack and individual cell impedance
Connects in parallel to existing electrolysis cell and fuel cell systems — no dedicated power supply or load required, and no system modifications needed
Non-contact current sensor method eliminates temperature drift associated with shunt resistors, enabling high-accuracy measurements at low frequencies below 1 Hz
Supports measurement currents up to 10 kA via combination of multiple current sensors, enabling EIS on large industrial-scale electrolysis cells during live operation
Supports Nyquist plot, Bode plot, and logging plot display modes

The HIOKI ALDAS-E (Active Line Device Analysis System) is a high-speed, high-precision Electrochemical Impedance Spectroscopy (EIS) measurement system designed for use during the actual operation of kW to MW class electrolysis cells, fuel cells, and cell stacks. The system measures impedance (R, X, θ, Z), voltage, and current, and supports multi-channel measurement expandable from 1 to 48 channels, enabling simultaneous tracking of total stack and individual cell impedance. For large electrolysis cells with high currents flowing in multi-wire configurations, multiple current sensors can be combined to measure currents up to 10 kA, allowing EIS measurements to be performed by detecting small AC signals amidst noisy DC currents during live operation. The system connects in parallel to existing electrolysis and fuel cell systems without requiring a dedicated power supply or load, and uses non-contact current sensors to avoid temperature drift issues common with shunt methods, ensuring stable, high-accuracy measurements down to frequencies below 1 Hz. The minimum measurement time is 7.6 minutes under specified fast-mode conditions (10 kHz to 0.01 Hz, 30 points). The measurement voltage range is 1.5 V to 1000 V and the frequency range is 10 mHz to 100 kHz.

Use Cases

EIS measurement during actual operation of kW to MW class electrolysis cells and fuel cell stacks
Simultaneous observation of total stack performance and individual cell impedance states
EIS measurement on large electrolysis cells with high-current multi-wire configurations (up to 10 kA)
Connection to and evaluation alongside existing electrolysis cell and fuel cell systems without system modification

Capabilities

Performs EIS measurements over a frequency range of 10 mHz to 100 kHz
Measures impedance (R, X, θ, Z), voltage, and current simultaneously
Supports 1 to 48 input channels, expandable for comprehensive stack observation
Measurement voltage range of 1.5 V to 1000 V, covering low-voltage single cells through high-voltage stacks
Measurement current range of 400 mA to 2000 A (CT6877A sensor); maximum 10 kA achievable with combination of sensors
Maximum applied measurement signal of 80 Ap-p at 50 V; derating applies for voltages above 50 V
Non-contact current sensor method provides stable measurements at low frequencies below 1 Hz, free from shunt-related temperature drift
Capable of detecting small AC signals amidst noisy DC currents during live stack operation
Operates in Logging Mode and EIS Mode; displays Nyquist plot, Bode plot, and logging plot

HIOKI E.E. CORPORATION Hioki Corporation supplies advanced electrical measurement solutions tailored for hydrogen energy R&D, including fuel cells and water electrolysis systems. Their precision testing instruments are engineered to evaluate and optimize hydrogen production efficiency, ensuring safety and performance in the emerging green energy supply chain.

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