Researchers at RWTH Aachen University, in collaboration with industry partners, have launched the ‘SchnelleZelle’ (FastCell) project, aiming to optimize the fast-charging capability of prismatic lithium-ion batteries. The three-year initiative, backed by Germany’s Federal Ministry for Economic Affairs and Climate Protection, seeks to improve battery performance by reducing charging times and increasing charging power while maintaining safety and longevity.
Although the findings could be applicable to electric mobility, the project primarily focuses on stationary energy storage systems, which are expected to play a key role in the energy transition. While batteries in photovoltaic-connected storage units typically charge at a steady rate, industrial applications often require fast-charging capabilities to manage power fluctuations.
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The research consortium includes the Chair of Production Engineering of E-Mobility Components (PEM) at RWTH Aachen University, Fraunhofer Research Centre for Battery Cell Production (FFB), the Institute for Power Electronics and Electrical Drives (ISEA), as well as industrial partners Mahle Behr GmbH, Hoerbiger Antriebstechnik Holding GmbH, and Flexoo GmbH. Trumpf Laser- und Systemtechnik GmbH is also participating as an associated partner.
‘SchnelleZelle’ takes a holistic approach, addressing advancements in cell design, electrode interconnection, sensor integration, cooling, and control strategies. The project aims to achieve a 16% improvement in fast-charging capability within the 10-80% state of charge range. Researchers plan to integrate sensors into battery cells and apply machine learning algorithms to optimize charging processes. Additionally, improvements to electrode stack connections and cell housing are expected to minimize internal resistance and enhance thermal stability.
At the conclusion of the project in late 2027, prototype cells will be produced at Fraunhofer FFB and tested in a battery network before being introduced to the industry. “Enhancing fast-charging capability in lithium-ion technology is a crucial challenge for both research and industry,” said PEM Director Professor Achim Kampker. “This can be achieved by integrating sensors into the cells and adopting innovative approaches in cell design, cooling, and charging algorithms,” added PEM management member Professor Heiner Heimes.