In the field of cell development, the main focus is on product-related research and development of lithium ion cell technology with the aim of developing high-quality, high-performance cells. The focus is on reducing cell costs while simultaneously increasing energy density, cycle stability, calendar life and intrinsic safety. The Battery Technical Center offers the possibility of manufacturing lithium ion pouch cells in laboratory format and large format (up to 20 Ah) in a drying room. The construction of prototypes as well as small series is possible at Battery Technical Center.
Improved and novel electrolytes are developed in the Battery Technical Center, as well as new formulations and processes for slurries and electrodes in cooperation with the KIT institutes MVM and TFT. The new raw materials and manufacturing processes are first tested on the basis of specially manufactured laboratory cells and then validated in large-format pouch cells as product-related applications.
Due to the highly reproducible cell construction on the hand production lines, individual cell components are also evaluated by industrial partners in this area:
- Testing of individual cell components such as separators, electrodes and arrester foils
- Testing of additives, electrolyte mixtures
Quality control and defect research also plays an important role in cell development. In order to clarify cause and effect relationships, cell construction tests are carried out with forced errors. Methods such as electron microscopy or X-ray analysis are available for cell characterization and post-mortem analysis.
In the field of cell testing, electrical cell characterizations including endurance tests and application-specific evaluations can be performed to measure cell performance. For this purpose, numerous channels (0-6 V, 50 or 200 A max.) are available in an open test field conditioned at 25°C as well as in a climate chamber (T range). The testing of all cell formats (prismatic/hardcase, pouch and round cells) is thus possible:
- Market screening State-of-the-art cells
- Capacity tests
- Load behaviour
- Cycle Aging
- Internal resistances
- OCV-SOC curves
- Ageing under real load profiles
- Power dissipation
- High-precision measurements for self-discharge
- Safety assessments