Zustandsdiagnose und Modellbildung von Lithium-Ionen Batteriesystemen zur Weiterverwendung in der Energieversorgung

The concept for an environment-friendly, reliable and affordable energy supply sets high goals for the development of renewable energies in the electricity sector. An important factor for the successful implementation of these goals is the creation of load-shifting and electricity storage capacities. Another important part of the energy concept is the reduction of energy consumption in the traffic sector. In order to achieve this, the introduction of highly efficient, electric powered vehicles is necessary. This work addresses the question how battery storage systems of electric vehicles can help to provide electricity storage capacities for the electricity sector under these highly dynamic boundary conditions.

In order to achieve this, a scenario-based analysis shows the potential of used battery storage systems from electric vehicles and compares it to the projected need of electricity storage capacity in the electricity supply sector. Due to the high variability of stress factors on a battery storage system in an electric vehicle, e.g. different driving and charging profiles and differences in regional temperature profiles, the state of health of battery systems can vary significantly over time. Therefore it is another goal of this work to develop a procedure for the clustering of battery cells in order to choose samples for further investigation and cycling.

Finally, a simulation model is set up in order to analyze the deployment of used energy storage systems in households with photovoltaic generators to raise the self-consumption quota. The parameters for the simulation model are derived from the empirical examination of cells. The main focus of the investigation lies on the influence of different load patterns on the second-use performance.

The result of this work is a method that can be used to analyze the potential of batteries for the deployment in stationary battery systems.