Leak Testing Of Battery Tray With Helium In Accumulation Chamber
Leak testing is a fundamental operation in the production process of the battery pack and its components such as tray, frame, housing, cover.
Due to the high cost of a battery pack, it’s recommended to test the quality of its housing components during their manufacturing process and before proceeding with the next assembly operations.
For 100% quality check during mass production, global leak testing methods could be requested to minimize the testing time.
Whenever it’s not possible to apply air methods (pressure decay or mass flow), because it’s not compatible with the testing specifications, helium tracing in accumulation chamber represents an optimum compromise for highest testing sensitivity and minimum cycle time.
This technique of control during the production of battery trays and covers provides a reliable method for an early recognition of sealing defects, in order to prevent the assembly of components that could allow the entry of moisture and/or water inside the component under test.
The part under test is firstly sealed with a dedicated lid, to insulate the tested volume and later closed into a testing chamber at ambient pressure. The tested volume is filled with helium, in order to detect through a mass spectrometer any passage of tracer gas to the accumulation chamber.
Checking the pack components is an operation complicated by the large size and high deformability of the structure, even at low testing pressures. Marposs’s long-term experience for this type of application always guarantees the best design and construction of the sealing lid, clamping systems, and sealing gaskets, which are used to isolate the test volume.
The testing method with tracer gas guarantees the maximum sensitivity and the possibility to identify extremely low leaks, also for big volumes of the part and in any environmental condition.
Our helium leak test systems in accumulation chambers are capable of testing leaks with thresholds in the range of 10-2- 10-4 SCC/sec. This technology provides great results in this range and makes the application simple and reliable.
- Detects leaks up to 10-4 SCC/sec
- Tracer gas method independent on part and ambient temperature
- Suitable for testing of parts with big volume and deformable housing
- Cycle time optimization, not depending on the extension of the sealing surfaces
- Built according to customer’s specifications
- Dedicated or flexible solutions
- Robust construction
- Fully automatic solution or manual loading
- High reliability
- Low running costs
- Detected leaks up to 10-4 SCC/sec
- Cycle time depending on the specific application requirements
- Fully automatic testing station
- Possible manual application, for low volume production lines
- Integrated air method (pressure decay or mass flow) can be used for gross leak pre-check