Filling of battery cells with electrolytes

Small dispensing errors cause large variations in battery performance. Hermetic, high-precision dosing pumps are needed for this application. Filling electrolytes into battery cells is a critical step in battery manufacturing. Factors such as electrolyte formulation, pressure and temperature must be considered in the filling process.
Filling of battery cells with electrolytes

Hermetic pump mzr-7265 for electrolyte filling (Image source: HNP Mikrosysteme)

Critical to battery performance and life are the quality of the electrolyte and the accuracy of the filling process. Small dispensing errors cause large variations in performance. High-precision micro annular gear pumps from HNP Mikrosysteme are used for this application. Lithium-based liquid battery electrolytes are crystallizing and hazardous to health, and require the use of hermetic pumps. The magnetic hermetic pump mzr-7265 doses volumes between 4 and 8 ml in 2 seconds with a deviation of less than 1%. The process takes place under vacuum conditions. In addition to low-pulsation and precise dosing, the pump realizes very short cycle times. LOHC-based hydrogen storage is another application field for micro annular gear pumps.

Pumps of the high performance series, mzr-4605 or mzr-7205 are used to deliver LOHC dibenzyltoluene, also known as Marlotherm, perhydro-dibenzyltoluene and benzyltoluene. For example, the pumps deliver dibenzyltoluene with volume flow rates between 1 ml/min and 240 ml/min into a reactor. Here, the medium is charged with hydrogen by means of hydrogenation.

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Compact Filling Nozzles: Optimal Use of Installation Space

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Limited mounting space due to closely arranged formats for small packaging sizes combined with high output – what could the perfect dosing solution for this task look like? Compact filling nozzles, which are installed as battery arrangements, nozzle blocks, or in multiple lines in large filling systems, are an important building block on the way to the most efficient processes possible and the optimum solution.

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