The gases formed during the first loading process (=formation) collect in the so-called gas pocket, which is then vacuumed and sealed. A clean, dry vacuum environment is essential here to prevent contamination of the cell. In addition, the gas can only be extracted completely and residue-free under a vacuum. Oil-sealed pumps deliver sufficient performance in this process step and are used in many installations. However, a particular challenge for vacuum pumps could be that aggressive gases need to be handled which could enter the pumps. These gases could attack the oil which creates a high maintenance need. For such cases, dry-running pumps are the optimal solution, as they do not require oil in the compression room and can discharge such gases without being attacked.

The finished Li-ion cells have a high energy density. The electrolytes, consisting of a conducting salt and organic solvents, among other things, react strongly and quickly under ambient conditions. A cell’s seal is therefore an important safety criterion. Only leak-tested Li-Ion cells are used in electric vehicles and aircraft. In order to carry out this important and safety-minded leak test with high reliability and accuracy, the battery housing should be leak-tested at the very beginning. For prismatic and cylindrical cell housings, Leybold offers different versions of the PHOENIX Helium Leak Detector. Depending on requirements, size and environmental conditions, the PHOENIX Quadro can be used with a dry or oil-sealed pump. For flexible applications, the PHOENIX Vario can be used with any backing pump. All PHOENIX leak detectors feature the highest accuracy of measurement and operate intuitively.