Test gas leak detection on batteries for electric vehicles

Electric vehicles are crucial in reducing_{CO2 emissions} in road traffic. They store the drive energy in batteries and an electric motor converts it into motion. If the batteries are charged with electricity from renewable energy sources, they have a_CO2-free energy balance. Today, lithium-ion batteries are used almost exclusively as accumulators. Vacuum technology is indispensable for their production.

Tracer gas leak detection ensures quality

The flawless functioning, quality and safety of lithium-ion batteries, which are used as accumulators in electric vehicles, depends on their integrity and impermeability to external influences such as penetrating moisture. For this reason, leak detection systems are used in battery production to check the batteries. Pfeiffer Vacuum supplies the necessary vacuum solutions from a single source. One of the world's leading battery manufacturers for the automotive industry is currently using test gas leak detection systems from Zeltwanger Leaktesting & Automation GmbH, which are equipped with complete solutions from Pfeiffer Vacuum. The systems have to meet stringent requirements. The decisive factors here are achieving the required cycle time and high reproducibility of the battery cell test.

Leak detection with helium, among other things

Helium leak detector from Pfeiffer Vacuum's ASI 35 seriesWith the helpof Zeltwanger's testing systems, even the smallest leaks can be quantified and localized. This makes it possible to quickly eliminate leaks in a downstream production step. Changes to geometries and improvements to production methods and processes can be initiated based on the results obtained. This leads to quality improvements, increases the yield and reduces manufacturing and testing costs. Together with Zeltwanger, Pfeiffer Vacuum's team of experts designed suitable solutions. Pfeiffer Vacuum is characterized by its know-how and expertise in leak testing and vacuum technology, combined with a broad product portfolio that offers the entire product range from a single source. Helium leak detectors from the ASI 35 series (Fig. 1) as well as valves, vacuum gauges, DuoLine, Hena and Pascal backing pumps and other components are used in the test system.

Intensive cooperation

"Since our entry into leak testing with helium a few years ago, we have acquired extensive know-how through intensive development work and close cooperation with leading suppliers of key components - including Pfeiffer Vacuum. In addition to innovative ideas and skillful implementation, this is one of the main reasons for our leading position today. The transfer of knowledge and the support of the Pfeiffer Vacuum application team helped us with the preparatory work for important orders and enabled us to experience a helpful learning curve," explains Markus Mattauch, the responsible project manager at Zeltwanger. In the years leading up to project realization, the collaboration between Pfeiffer Vacuum and Zeltwanger was intensified. Zeltwanger had the opportunity to familiarize itself with the functionality of the technology in earlier projects. The concept for the vacuum components was developed in close cooperation with a view to performance, footprint and energy efficiency. The decisive factors were the short-term availability of the products and the well-known quality of Pfeiffer Vacuum.

Photos: Pfeiffer Vacuum