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Prof. Dr.-Ing. Julia Kowal

Julia Kowal

Room: EMH 163


Einsteinufer 11

Sec. EMH 2

10587 Berlin

Phone: +49 (0)30 314-25394

Fax:     +49 (0)30 314-21133


Consultation hours: On Mondays 9 - 10 h and on appointment 

Please note: Until further notice, there is no consultation hour with personal contact. Please phone me or write me an email.

The consultation hours on December 21 and 28 are cancelled.


since 03/2014
Chair of Electrical Energy Storage Technology at the TU Berlin
01/10 - 02/14
Senior engineer at the department of Electrochemical Energy Conversion and Storage Systems, ISEA, RWTH Aachen
PhD at RWTH Aachen, Topic: "Spatially-resolved impedance of nonlinear inhomogeneous 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 RISØ in Roskilde, Denmark
Research assistant at the department of Electrochemical Energy Storage Conversion and Systems at the Institute For Power Electronics and Electrical Drives (ISEA), RWTH Aachen
Studies of electrical engineering at RWTH Aachen Diploma thesis: "Investigation of the thermal behaviour of electrochemical energy storage systems in vehicle on-board power supplies"



Awards and Scholarships
Herbert-Kind-Price of ETG in the VDE
Brigitte-Berkenhoff-Price for the best graduate in the field of electrical engineering at RWTH Aachen
Aachen's VDE price
Sponsorship through the Prof. Dr. Koepchen Merit Foundation (RWE)


How to determine the time for temperature equalisation in batteries and supercaps for reliable laboratory measurements
Citation key Kowal2015113
Author Julia Kowal and Arno Arzberger and Holger Blanke and Dirk Uwe Sauer
Pages 113 - 120
Year 2015
ISSN 2352-152X
DOI http://dx.doi.org/10.1016/j.est.2015.09.009
Journal Journal of Energy Storage
Volume 4
Abstract Abstract Temperature is an important impact factor for both battery performance and lifetime. As lifetime of a battery is typically smaller than that of the application it is used in and performance decreases significantly with ageing, lifetime and performance predictions are of great importance for almost all battery-powered applications. To achieve a good and reliable prediction, comprehensive ageing tests with a significant number of different operating conditions are necessary. From time to time, ageing tests are interrupted for capacity and resistance checkups. For comparable results, these checkups have to be performed under the same ambient conditions, typically room temperature. Thus, before the checkup is started, temperature equalisation is needed. The same is true for performance tests or parameterisation measurements for electrical models. Typically, they are not only performed at room temperature, but also at other temperatures to identify the influence of temperature on performance or electrical impedance. For this reason, a homogeneous temperature within the cell is essential for the test results as well. Therefore, a certain waiting time has to be inserted before starting the test, that on the one hand has to be long enough to assure that all parts of the battery have the same temperature, but on the other hand is as short as possible to prevent an unnecessary prolongation of the test, especially for already time consuming ageing tests. Temperature measurements within cells are typically impossible for commercial cells without destroying the cell. However, this paper shows that it is sufficient to measure the outside temperature to find out the necessary waiting time.
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Technische Universität Berlin
Electrical Energy Storage Technology
Institute of Energy and Automation Technology
Faculty IV
sec. EMH 2
Einsteinufer 11
D-10587 Berlin


Sec. EMH2
Room EMH 162
+49 (0)30 314-21633
+49 (0)30 314-21133