TU BRAUNSCHWEIG

EW-8 Junior Research Group Model Based Multiscale-Development of Battery Systems

The junior research group model based multiscale-development of battery systems investigates the integration of mathematical models in the development process of lithium-ion batteries in general and of all solid state batteries in particular. Various simulation methods are applied from molecular to systems level. Applied methods are system modeling, finite element modeling, discrete element modeling, as well as modeling on atomistic scale. Focus of the research group is the adequate combination of different modeling methods, i.e. interaction and coupling of models, as well as an integral investigation of production, application and abuse of battery systems.

The group develops a methodology to couple process-chain simulations and battery cell simulations. The aim is to enable an integral evaluation of the impact of production on the product quality. Here, the investigations focus on the uncertainty of production properties and their propagation along the production chain. The concept is shown in Figure 1.

Abbildung 1: Modellkonzept zur Analyse der Interaktion von Schwankungen beider Batteriezellproduktion
Abbildung 1: Modellkonzept zur Analyse der Interaktion von Schwankungen beider Batteriezellproduktion (Quelle: InES)

Further, direct coupling of different models is investigated. For instance, such a model has been realized by coupling atomistic reaction kinetics with macroscopic cell models. The coupled model has been applied to perform multiscale simulations of solid electrolyte interface (SEI) growth in lithium-ion batteries. This approach allows detailed analysis of film growth and interaction from atom to cell level. In Figure 2 the model concept and simulation examples are given.

Abbildung 2 Multiskalensimulation des SEI-Schichtwachstums in Lithium-Ionen-Batterien
Abbildung 2 Multiskalensimulation des SEI-Schichtwachstums in Lithium-Ionen-Batterien (Quelle: InES)

Coupling of various models is also applied to simulate the thermal runaway. These models require to couple models for simulation of mechanical particle-particle interaction with chemical and thermal simulation within global cell model. The model scope is shown in Figure 3.

Abbildung 3: Multiskalensimulation des Abuseverhaltens von Batterien
Abbildung 3: Multiskalensimulation des Abuseverhaltens von Batterien (Quelle: InES)

To integrate the model-based analysis in the development of batteries, model based data analysis is used. Here, large data sets from battery production are analyzed. Results from the simulation based analysis can be automatically processed to optimize the production.

Group leader:
  • Dipl.-Ing. Fridolin Röder, Institute of Energy and Process Systems Engineering, Technische Universität Braunschweig
scientist:
  • Oke Schmidt, Institute of Energy and Process Systems Engineering, Technische Universität Braunschweig
  • Florian Baakes, Institute of Energy and Process Systems Engineering, Technische Universität Braunschweig
  • Vincent Laue, Institute of Energy and Process Systems Engineering, Technische Universität Braunschweig
  • Matthias Thomitzek, Institute of Machine Tools and Production Technology, Technische Universität Braunschweig
  • Clara Sangros, Institute for Particle Technology, Technische Universität Braunschweig
  • Uwe Westerhoff, elenia, Technische Universität Braunschweig
  1. Röder, F., Braatz, R. D., Krewer, U.: Multi-Scale Simulation of Heterogeneous Surface Film Growth Mechanisms in Lithium-Ion Batteries, Journal of the Electrochemical Society, 2017, Doi: 10.1149/2.0241711jes
  2. Thomitzek, M., Schmidt, O., Röder, F., Krewer, U., Herrmann, C., Thiede, S.: Modeling the impact of production influences on electrochemical behavior of LIBs, Batterieforum Deutschland, 2018.
  3. Thomitzek, M., Schmidt, O., Röder, F., Krewer, U., Herrmann, C., Thiede, S.: Model approach for accessing the impact of production influences on electrochemical behavior of LIBs, Kraftwerk Batterie, 2018.
  4. Thomitzek, M., Schmidt, O., Röder, F., Krewer, U., Herrmann, C., Thiede, S.: Simulating Process- Product Interdependencies in Battery Production Systems, Procedia CIRP, 2018.
Dipl.-Ing. Fridolin Röder

Head of the Junior Research Group Model Based Multiscale-Development of Battery Systems

Technische Universität Braunschweig
Institute of Energy and Process Systems Engineering
Franz-Liszt-Str. 35
D-38106 Braunschweig

Tel.: +49 0531 391 3041
E-Mail: f.roeder@tu-braunschweig.de

  last changed 12.11.2018
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