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Cell development/testing


The focus of cell development is on product-related research and development in lithium-ion cell technology with the objective to develop high quality and high performance cells. Therefore, the reduction of cell costs while increasing energy density, cycle stability, calendar life and intrinsic safety is paramount. At Battery Technical Center, Lithium-ion pouch cells can be produced in lab and large-format size (up to 20 Ah) in the dry room of the research factory. Both prototype and small series production is possible.


Besides cell production, improved and novel electrolytes are being developed and, in collaboration with the KIT institutes MVM and TFT, also new recipes and processes for slurries and electrodes. The new raw materials and manufacturing processes are validated with the own large-format pouch cells.


In cell development, quality control and fault analysis also play an important role. For the clarification of cause-and-effect relationships cell manufacturing tests with intentional faults are being carried out. Moreover, different methods such as electron microscopy or X-ray can be used for cell characterization and post-mortem analyses.


In cell testing, electrical cell characterization including long-term tests and application-oriented assessments can be carried out for the determination of cell performance:

  • Market screening state-of-the-art cells
  • Measurement of 
    • Capacity
    • Load behavior
    • Cycle ageing
    • Internal resistance
    • OCV-SOC
    • Ageing under real load profiles
    • Power loss
  • Highly precise measurement of self-discharge
  • Safety assessment