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Prismatic Battery Helium Leak Testing Machine
Our prismatic battery helium leak testing machine is designed for dry leak testing of top cover and seal nail sealing on prismatic aluminum‑case batteries after secondary electrolyte filling. This lithium battery secondary helium leak detection equipment uses the vacuum chamber method: batteries pre‑filled with helium are placed in a vacuum chamber, and a mass spectrometer detects any helium leakage. As a prismatic cell vacuum helium leak tester for battery sealing, it achieves a detectable leak rate <9.9×10⁻⁷ Pa·m³/s, with a minimum detectable leak rate of 5×10⁻¹³ Pa·m³/s. Confirmed good cells are automatically transferred to the next process.
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What Is a Prismatic Battery Helium Leak Testing Machine?
A prismatic battery helium leak testing machine is a critical quality control instrument used to verify the hermetic seal of prismatic aluminum‑case batteries after top cover laser welding and seal nail welding. Leakage can lead to electrolyte leakage, moisture ingress, and premature battery failure. Our system performs non‑destructive dry leak testing using helium as a tracer gas, ensuring that only perfectly sealed cells proceed to formation and assembly.
Lithium Battery Secondary Helium Leak Detection Equipment – Working Principle
This lithium battery secondary helium leak detection equipment operates as follows:
Pre‑condition: Batteries are already filled with a small amount of helium during the secondary electrolyte filling process (previous station).
Loading: The battery is automatically placed into a vacuum chamber.
Evacuation: The chamber is evacuated to a pressure ≤40Pa.
Leak detection: A mass spectrometer connected to the chamber continuously samples the gas inside the chamber. If helium is detected, it indicates a leak.
Evaluation: The system calculates the helium leak rate.
Sorting: Batteries that pass the leak test (leak rate below the threshold) are transferred to the next process; failing batteries are rejected.
The vacuum chamber method ensures high sensitivity and repeatability, with no contamination of the battery.
Prismatic Cell Vacuum Helium Leak Tester for Battery Sealing – Technical Parameters
As a high‑performance prismatic cell vacuum helium leak tester for battery sealing, our machine meets the following specifications:
| Parameter | Value |
|---|---|
| Helium leak rate detection limit | <9.9×10⁻⁷ Pa·m³/s |
| Minimum detectable leak rate | 5×10⁻¹³ Pa·m³/s |
| Vacuum chamber start pressure for testing | ≤40 Pa |
| Chamber sealing performance | Evacuate to 20 Pa, hold for 2 minutes, then measure pressure rise; ≤50 Pa rise in 1 minute |
| Cycle time | Typically 8–12 seconds per chamber (depends on chamber size) |
| Test method | Vacuum chamber + mass spectrometer (helium) |
| Applicable products | Prismatic aluminum‑case batteries after top cover & seal nail welding |
Key Features & Process Integration
High sensitivity – Detects leaks as small as 5×10⁻¹³ Pa·m³/s, far below the industry threshold.
Reliable chamber sealing – Excellent vacuum integrity ensures no false positives.
Automated operation – Integrated with upstream (secondary filling) and downstream (next assembly) conveyors.
Mass spectrometer – Fast response, low maintenance, long life.
Data logging – Each cell’s leak rate is recorded for traceability.
Safety – Helium is inert and non‑toxic; system includes exhaust ventilation.
Why Choose This System for Battery Sealing Quality Control?
Ensure safety – Prevents electrolyte leakage and thermal runaway caused by poor sealing.
Improve yield – Catches defective cells before they enter costly downstream processes.
Compliance – Meets automotive and energy storage industry standards for leak testing.
Low operating cost – Helium consumption is minimal; chamber maintenance is simple.
Applications
Prismatic battery manufacturing – After top cover laser welding.
Post‑seal nail welding – Final sealing test before formation.
EV and ESS battery lines – High‑volume production requiring 100% inline leak detection.
🔬 Ultra‑high sensitivity – Detects leaks <9.9×10⁻⁷ Pa·m³/s, min 5×10⁻¹³ Pa·m³/s.
⚙️ Vacuum chamber method – Reliable, non‑contaminating, fully automated.
🏭 Inline ready – Seamless integration with secondary filling and downstream processes.