This equipment is specifically designed for leak testing of Membrane Electrode Assemblies (MEA) and bipolar plates (including those used in fuel cells and flow batteries). It enables fast, quantitative detection of:
●External leakage: Gas leakage at component edges or sealing interfaces
●Internal leakage / cross-over: Through-membrane leakage from anode to cathode in MEA, or leakage between the cooling chamber and reaction chamber in bipolar plates
●Sealing defects: Discontinuous sealant lines, micro-cracks, poor compression, etc.
Widely used for incoming material inspection, in-process quality control, and R&D validation in fuel cell / flow battery production lines.
PRODUCT DESCRIPTION
The equipment primarily employs two high-precision leak detection methods: the differential pressure method and the mass flow method.
●Differential pressure method: The sealed test cavity or device under test is pressurized with air or nitrogen to a specified pressure. After stabilization, the gas supply is isolated. A high-sensitivity differential pressure sensor measures the pressure drop over a set period, which is then converted into a leak rate.
●Mass flow method: The test part is continuously pressurized while maintaining a constant pressure. A mass flow meter directly measures the make-up gas flow required to sustain that pressure, providing the real-time leak rate.
For measuring cross-over leakage in MEA, the clamped gas introduction method is typically used: low-pressure gas is applied to one side of the MEA, while a high-sensitivity flow sensor on the opposite side detects the transmitted gas flow.
1. Pneumatic/Servo Clamping Unit
●Delivers stable, programmable clamping force to simulate stack assembly pressure (typically 0.5–2 MPa, adjustable).
●Upper and lower platens are equipped with sealed silicone gaskets or metal hard-stop sealing structures.
2. Pneumatic Control System
●Includes precision pressure regulators, solenoid valve banks, fill valves, and exhaust valves.
●Multi‑channel independent control allows separate pressurization and testing of the anode, cathode, and cooling chambers.
3. High-Precision Detection Unit
●Differential pressure sensor: Range ±1 to ±10 kPa, accuracy ±0.1% FS.
●Mass flow meter: Range 0–100 sccm / 0–10 slm, accuracy ±0.5% FS.
●Standard leak (with calibration certificate) for daily instrument verification.
4. PLC and Touchscreen Control System
●Pre‑programmed test routines (e.g., bipolar plate external leakage, MEA cross‑over, cooling‑to‑reaction chamber leakage).
●Real‑time display of pressure‑time curves and leak rates; automatic PASS/FAIL judgment.
●Supports data storage, USB export, and MES integration.
5. Safety Protective Enclosure
Transparent shatterproof door with door‑open emergency stop to ensure operator safety.
1. Fuel cell bipolar plate (metal/graphite) production line: In‑line leak testing to reject non‑conforming parts.
2. Membrane electrode assembly (MEA) production line: Measuring cross‑over leak rate to ensure no pinholes or thin areas in the proton exchange membrane.
3. Flow battery bipolar plates: Leak testing between the sealing gasket and plate body (typically with low‑pressure air at 0.1–0.3 MPa).
4. R&D laboratories: Validating leak performance of new sealing designs or materials.
5. Pre‑stack assembly re‑testing: Verifying that all bipolar plates and MEAs meet leak tightness standards to avoid rework due to stack‑level leaks.
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