Featured Product
This Week in Quality Digest Live
Metrology Features
Tracking changes in fluorescence from ultracold atoms is a super-sensitive indicator of pressure
Prashant Kapadia
Aid root cause analysis by detecting wear and tear in advance
Mike John
How metrology can bring the medical-device design and manufacturing process together
Steven Brown
21st-century standard candles at NIST

More Features

Metrology News
For light-duty industrial weighing applications
Precision manufacturers can monitor Universal Robots in real time and over time
New technology will allow customers to grow capacity, improve profit margins and gain efficiencies
Demonstrating a commitment to keeping people safe and organizations running
Meet the latest generation of LC xx6 encoders
On-demand pipe flow measurement, no process interruptions
Q-Span Gauging Systems improve efficiency, capacity, and real-time reporting of quality departments

More News

Quality Digest


Marposs Announces Automatic Machine for Leak Testing of Sealed Batteries

Designed for high-volume production environments

Published: Tuesday, June 14, 2022 - 12:00

(Marposs: Auburn Hills, MI) -- Marposs, a leader in measurement, inspection, and test technologies, has announced its new automatic machine for leak testing of sealed batteries in high production environments. This patent pending system is based on electrolyte tracing, which makes it possible to perform the leak test after it has been filled with the electrolytes and completely sealed.

Perfect sealing is necessary to prevent the loss of electrolytes, often composed of flammable solvents which can produce toxic substances if they come in contact with humidity in the air. Additionally, it is equally important to prevent moisture and other sources of external contamination from entering the cell, which can compromise functionality.

Current state-of-the-art leak testing systems for battery cells use helium as a tracer gas in the vacuum chamber, which requires testing prior to filling with the electrolyte and sealing of the cell. Therefore, the tightness of the final seal cannot be totally verified. The ability of the Marposs system to test after filling and sealing provides higher quality verification of batteries being used in electric vehicle (EV) production.

Marposs battery leak tester

During operation, the cells are placed in the vacuum chamber during the test. In the presence of a housing leak, partial vaporization of the electrolyte solvent occurs, and it exits from the cell toward the vacuum chamber. The test principle is based on the possibility of measuring the extent of the leak by tracing these electrolyte vapors with a quadrupole mass spectrometer.

Cells can be tested in different stages of the production process: immediately after electrolyte filling and sealing, after formation, or after degassing and subsequent final sealing, and up to the check during the end-of-line testing.

The Marposs automatic leak test system is available in three versions: cylindrical and button cells, prismatic cells, and pouch cells. The pouch cell version requires tooling to constrain the surface of the cell to avoid swelling when the vacuum is performed. The systems can trace different types of solvents typically used in the production of lithium-ion cells, such as DMC, DEC, EMC, PP, etc.

These systems provide:
• High sensitivity for sorting good batteries from leaking ones
• Short cycle times; one second/cell in button cell batteries
• Safety verification to avoid cross contamination should there be a gross leak in the battery cell
• Automatic contamination detection
• Automatic cleaning cycles
• Sorting of good batteries from leaking batteries

For more information on Marposs’ Automatic Leak Testing System for Sealed Batteries, visit Leak Testing Of Sealed Battery Cells Through Electrolyte Tracing | Marposs or contact Marposs Corp. at (248) 370-0404 or marposs@us.marposs.com


About The Author

Quality Digest’s picture

Quality Digest

For 40 years Quality Digest has been the go-to source for all things quality. Our newsletter, Quality Digest, shares expert commentary and relevant industry resources to assist our readers in their quest for continuous improvement. Our website includes every column and article from the newsletter since May 2009 as well as back issues of Quality Digest magazine to August 1995. We are committed to promoting a view wherein quality is not a niche, but an integral part of every phase of manufacturing and services.