Although various leak detection methods are available, helium mass spectrometer leak detection (HMSLD) is the preferred and is being used broadly to ensure low air and water permeation rates in cells.
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The rapid detection of battery pack coolant-system leaks during production
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AI Customer Service“There currently are no reliable tests on which to base leak-detection standards for a full range of soft-pouch, cylindrical or prismatic battery cells in use throughout the industry,” says Daniel Wetzig, head of leak-detection R&D at INFICON—a specialist in gas analysis technology that designs and produces helium leak testing equipment.
Common lithium‐ion battery types. Testing for leak tightness requires some form of leak detection. Although various leak detection methods are available, helium mass spectrometer leak detection (HMSLD) is the preferred and is being used broadly to ensure low air and water permeation rates in cells.
Furthermore, the helium leak test cannot be used for pouch cells. There currently are no reliable tests on which to base leak-detection standards for a full range of soft-pouch, cylindrical or prismatic battery cells in use throughout the industry.
Over a given period of time, a leak rate can be determined. For this type of test, a leak rate of 10-6 mbar∙l/s is normally used. Depending on cell type, five percent or more of the lithium-ion cells currently produced for the auto industry may have undetected leaks.
The problem with this method is that, while helium tests can detect many common leaks in the casing, the test is performed before the cell is fully assembled. The cell can only be filled with electrolyte and sealed after the test is complete, so the sealed fill port is not tested for leaks.
Two primary objectives must be considered when testing lithium-ion battery cells: The need to minimize the loss of electrolytes over the battery cell’s lifecycle. The importance of reducing the possibility of moisture entering the battery cell. Prismatic battery cells in a vacuum test chamber.
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