Reaction images of a battery cell as a result of a nail penetration test
Stefan Doose / Institute for Particle Technology
Braunschweig University of Technology and Tongji University in Shanghai are jointly developing test and standardisation procedures for batteries to optimise their use in electric vehicles. The "BaSS" project, which is being funded by the Federal Ministry of Education and Research (BMBF, Bundesministerium für Bildung und Forschung) with one million euros, has now been launched.
In addition to developing new cell components, Braunschweig University of Technology and its Chinese partner are aiming to standardise formats and safety test procedures as part of their collaboration. Together, they intend to harmonise the current safety assessment procedures for individual cells, cell connections and complete storage systems.
Fewer tests necessary
One of the tests that the partners will consider together is the "nail penetration test", which demonstrates cell behaviour as a result of mechanical damage or faulty production. The test procedure simulates a local short circuit by inserting a nail into the charged cell. Various national and international standards with different test configurations exist for this and other test scenarios. In the BaSS project, a uniform certification procedure is to be developed, which will manage with fewer tests by harmonising different test configurations. Part of the standardisation process is therefore for the researchers to reduce the risks to a uniform minimum using suitable production processes and safety mechanisms.
Preparing standards for pouch cells
In parallel to the research partners’ standardisation efforts, both intend to develop cell components for future standard pouch cells with uniform formats and additional safety mechanisms. The researchers are working closely with VDE/VDI standardisation committees.