Helium Mass Spectrometry for Micro Leak Detection in Battery Envelopes
Inline helium mass spectrometry detects sub-micron battery envelope leaks down to 10-8 mbar l/s, preventing moisture-induced HF corrosion and solvent loss.
Turbomolecular Pump
Meaning
High-vacuum pumping systems utilize rapidly rotating blades to compress and transfer gas molecules from a sealed chamber to a backing pump. In battery test setups, a turbomolecular pump generates the deep vacuum required for high-sensitivity mass spectrometers to analyze escaping tracer gases. It maintains the operating pressures below ten to the minus five millibar, which is necessary to prevent ion collisions.
This extremely low pressure environment is vital for maintaining the accuracy of the ion source and protecting the mass spectrometer filaments from premature oxidation.
Operational Principle
The rotor blades spin at tens of thousands of revolutions per minute, imparting directional momentum to the gas molecules. This mechanism relies on molecular flow conditions where molecule-to-surface collisions dominate. It is highly efficient for light gases like helium but requires a backing pump to exhaust the compressed gas to the atmosphere.
System Integration
The vacuum system must be designed to protect the high-speed rotor from sudden pressure rises or particulate contamination. If a cell housing bursts inside the test chamber, the shockwave and electrolyte droplets can destroy the delicate blades. Solenoid isolation valves are integrated to close within milliseconds in the event of an overpressure.
Maintenance Schedule
Regular service includes checking the bearing wear and replacing the lubricating oil or cartridges. Because these pumps operate under extreme mechanical stress, scheduling preventive maintenance is crucial to avoid unplanned production stops. This maintenance ensures high system uptime on the manufacturing line.