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Prof. Dr.-Ing. Julia Kowal
- Julia Kowal
[1]- © privat
Room: EMH 163
Address:
Einsteinufer 11
Sec. EMH 2
10587 Berlin
Phone: +49 (0)30 314-25394
Fax: +49 (0)30 314-21133
E-mail: Julia.Kowal@tu-berlin.de [2]
Consultation hours: On Mondays 9 - 10 h and on appointment. In summer semester 2022 (25.4.-18.7.), the consultation hour will be from 10-11 h.
In most weeks, I am in the office on mondays, so a personal meeting is possible again. To be sure, please ask before you come. Alternatively, you can phone me or we can arrange a Zoom meeting.
Vita
| 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 |
| 2010 | PhD at RWTH Aachen,
Topic: "Spatially-resolved impedance of nonlinear inhomogeneous
devices - using the example of the lead-acid
battery" |
| 04/06-05/06 | Visiting researcher
at the company Exide in Azuqueca de Hénares,
Spain |
| 10/05-12/05 | Visiting Researcher
at the research centre RISØ in Roskilde,
Denmark |
| 11/04-12/09 | Research
assistant at the department of Electrochemical Energy Storage
Conversion and Systems at the Institute For Power Electronics and
Electrical Drives (ISEA), RWTH Aachen |
| 10/99-11/04 | 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" |
| 2006 | Herbert-Kind-Price of ETG in the
VDE |
|---|---|
| 2006 | Brigitte-Berkenhoff-Price for the best graduate
in the field of electrical engineering at RWTH
Aachen |
| 2002 | Aachen's VDE
price |
| 2001-2004 | Sponsorship through
the Prof. Dr. Koepchen Merit
Foundation (RWE) |
Publications
| Citation key | BAUKNECHT2022103667 |
|---|---|
| Author | S. Bauknecht and J. Kowal and B. Bozkaya and J. Settelein and E. Karden |
| Pages | 103667 |
| Year | 2022 |
| ISSN | 2352-152X |
| DOI | https://doi.org/10.1016/j.est.2021.103667 |
| Journal | Journal of Energy Storage |
| Volume | 45 |
| Abstract | The active materials of batteries are often tested and selected at the cell level, which prevents comparability to battery-level performance. In the case of a typical lead-acid battery used in a vehicle, the performance after a few months in operation is not necessarily the same as it was during cell-level tests. The goal of this manuscript is to outline the most common reasons for the divergence in test results between cell-level tests and commercial batteries with respect to dynamic charge acceptance (DCA). To do so, this study tested 12 V-70 Ah enhanced flooded batteries (EFB) for their DCA properties. Afterwards, these batteries were dissembled to extract three 2 V test cells, some with a lower number of plates (3P2N and 2P1N). The aim of this investigation was to determine how the DCA of the original battery was affected by changing the plate count and the ratio between the positive active mass, the negative active mass, and the electrolyte by using industrially manufactured cell components – rather than introducing sources of errors by using handmade cells. Both the test batteries and the test cells were subjected to two different constant current discharge tests: the reserve capacity (RC) test and the C20 test. The DCA test according to Japanese Standard SBA S0101 2014 was also conducted. It was particularly important to identify operational conditions and scaling factors (e.g. voltages, currents, and acid densities) on the cell level – for cells with and without lower plate counts. Currently, these are only defined for battery testing according to standard test procedures. Our test cell design, with a reduced, asymmetric set of plates, generated an acid surplus and a PAM surplus, which in turn had major effects on steady-state properties such as the constant current discharge (as the RC test and C20 test showed). DCA battery and cell-level results are not comparable in terms of absolute values, especially for cells with lower plate count. The DCA results for single cells are systematically better for a lower plate count, which may be attributed to excess acid volume. |
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Address
Technische Universität BerlinElectrical Energy Storage Technology
Institute of Energy and Automation Technology
Faculty IV
sec. EMH 2
Einsteinufer 11
D-10587 Berlin
Contact
Sec. EMH2Room EMH 162
+49 (0)30 314-21633
+49 (0)30 314-21133
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