BaSiS

Safety assessment of batteries

A major obstacle to the widespread use of e-mobility is its shorter range compared to conventional vehicles. The range can be extended by a considerable increase in energy density, e.g. through the use of new high-energy active materials in the cell. One of the biggest challenges here is to ensure the safety of the cell and the HV storage. The safety evaluation of cells with new materials on the basis of experiments is highly intricate and therefore associated with significant costs. In addition, such an experimental evaluation can only be carried out at the cell and module level, but these are only available relatively late in the development process. An early safety assessment of new materials is therefore essential to ensure an efficient and cost-effective development process.

Battery safety simulation

The aim of this research project is to enable a safety assessment at an early stage in the development of systems for automotive applications. An immediate simulation-based evaluation of new battery materials and cell designs enables on the one hand a targeted optimal safety-related design and on the other hand a significantly accelerated and cost-effective development process for safe and powerful battery systems. To achieve this, a multi-scale simulation methodology is to be developed. On the one hand, electrochemical models for modeling the reactions during a thermal runaway and on the other hand, mechanical models of the particle systems for simulating internal short circuits are developed. By coupling in a multidimensional model of the battery cell, the behaviour in case of failure due to overheating or mechanical deformation can be simulated. The individual models are separately parameterized in advance by developing special experimental setups, so that a prediction of the crash behavior is made possible.

Contact:

Stefan Doose
s.doose(at)tu-braunschweig.de

Alexander Hahn
alexander.hahn(at)tu-braunschweig.de