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SimDural

Simulation based safety assessment of an uncontrolled thermal runaway in aged battery cells

Project Information:

  • 01.04.2022 - 30.06.2025
  • BMWK (16BZF325F)
  • Funding: 506.445 € (TUBS)
  • Total Project Volume: 3.005.334 €

Project Partner:

  • Institute for Particle Technology (iPAT), TU Braunschweig
  • BMW AG
  • EL-Cell GmbH
  • KIT, Institute for Applied Materials – Electrochemical Technologies
  • SGS Germany GmbH
  • Siemens Industry Software GmbH

Overall summary of the project

The steadily increasing demands on the range of electric vehicles result in an increase in the energy density of the active materials. Ensuring the same level of safety remains one of the biggest challenges.

The main objective of the SimDural project is to develop a simulation-based workflow for the safety assessment of the uncontrolled thermal runaway in aged battery cells. For this purpose, cells will be manufactured and electrochemically aged in a controlled manner, as well as examined post-mortem within the scope of the research project. Reaction equations, reaction kinetics, electrolyte evaporation and short-circuit mechanisms will be modeled for the targeted simulations. A combination of calculations at the molecular level, at the particle and electrode level (discrete element method) and in the continuum with electrochemical and thermodynamic models will be used. Experiments to parameterise these models will also be performed on different scales, including pouch cell level. Additionally, a test device for determining gas products will be developed. Abuse cases will be simulated using a proprietary physical model of the full cell and a multi-physical 3D model with homogenised electrode layers. An important part of the project is the validation of the simulation-based workflow using cells in different aging states, which will be performed multiple times during the project.

The common goal of the consortium is that the workflow developed from an intelligent combination of experiments and simulations can be performed within 3 months. This means that the workflow can be used, among other things, in an early phase of the development process to optimise the cell design.

Aims and Tasks of iPAT:

  • Modeling of the phenomena of an uncontrolled thermal runaway using DEM simulation
  • Parameterisation of the cell component properties with suitable preliminary studies
  • Investigation of the behaviour of aged battery cells during mechanical abuse
  • Investigation of the behaviour of aged battery cells during thermal abuse in an ARC

Contact:

Tobias Ohnimus
tobias.ohnimus(at)tu-braunschweig.de

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

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