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TU Berlin

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Julia Kowal



Chair of Research Group at TU Berlin:

Electrical Energy Storage Technology


Contact Information at TU Berlin:

Technische Universität Berlin
Department of Electrical Engineering and Computer Sciences

Sekr. EMH 2
Einsteinufer 11
10587 Berlin

Email: julia.kowal@tu-berlin.de
Phone: +49 (030) 314 25394
Fax:   +49 (030) 314 21133

Further Information can be found on http://www.eet.tu-berlin.de/menue/elektrische_energiespeichertechnik/personen/leitung/parameter/en/



Research Focus:

My research interests are lifetime prediction and simulation models of different energy storage devices, such as batteries and supercaps. This includes testing and analysis of cells for understanding the mechanisms of ageing and operation as well as for parameterization of electrical, thermal and ageing simulation models. For testing, we have equipment for charging and discharging cells, impedance spectroscopy, opening cells and surface structure analysis. Simulation models are mostly equivalent circuit models but also finite elements and finite differences models, especially for spatially resolved electrical and thermal models. We use mainly MATLAB/Simulink, but also COMSOL, as simulation tools.


Short CV
since 2014
Chair of Electircal Energy Storage Technology at the TU Berlin
2010 - 2014
Senior engineer at the department of Electrochemical Energy Conversion and Storage Systems, ISEA, RWTH Aachen
PhD at RWTH Aachen "Spatially-resolved impedance of nonlinear inhomogenous devices - using the example of the lead-acid-battery"
Visiting researcher at the company Exide in Azuqueca de Hénares, Spain
Visiting researcher at the research centre RISO in Roskilde, Denmark
2004 - 2009
Research assistant at the department of Electrochemical Energy Conversion and Storage Systems at the Institute for Power Electronics and Electrical Devices (ISEA), RWTH Aachen
1999 - 2004
Studies of Electrical Engineering at RWTH Aaachen (Diploma Thesis: "Investigation of the thermal behaviour of electrochemical energy storage systems in vehicle on-board power supplies")
Awards and Scholarships
Herbert-Kind-Prize of ETG in the VDE
Brigitte-Berkenhoff-Prize for the best graduate in the field of electrical engineering at RWTH Aachen
Aachen's VDE prize
2001 - 2004
Sponsorship through the Prof. Dr. Koepchen Merit Foundation (RWE)
Five Selected Publications
J. Kowal, A. Arzberger, H. Blanke, D.U. Sauer.
How to determine the time for temperature equalization in battery supercaps for reliable laboratory measurements.
J. Energy Storage 4 (2015), pp. 113-120 
J. Kowal, D. Hente, D.U. Sauer.
Model Parameterization of nonlinear devices using impedance spectroscopy.
IEEE Trans. Instrumentation and Measurements 58 (7) (2009), pp. 2343-2350
J. Kowal, D. Schulte, D.U. Sauer, E. Karden.
Simulation of the current distribution in lead-acid batteries to investigate the dynamic charge acceptance in flooded SLI batteries.
J. Power Sources 191 (2009), pp. 113-120 
O. Bohlen, J. Kowal, D.U. Sauer.
Ageing behaviour of electrochemical double layer capacitors, Part II: Lifetime simulation model for dynamic applications.
J. Power Sources 173 (2007), pp. 113-120 
J. Schiffer, D.U. Sauer, H. Bindner, T. Cronin, P. Lundsager, R. Kaiser.
Model prediction for ranking lead-acid battery according to their expected lifetime in renewable energy systems and autonomous power supply systems.
J. Power Sources 168 (2007), pp. 66-78 




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