TU Berlin

Electrical Energy Storage TechnologyChair

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Prof. Dr.-Ing. Julia Kowal

Julia Kowal
Lupe

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:

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


CV
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"

 

 

Awards and Scholarships
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

Comparison of Dynamic Charge Acceptance Tests on Lead-Acid Cells for Carbon Additive Screening
Citation key https://doi.org/10.1002/ente.202101051
Author Bozkaya, Begüm and Bauknecht, Sophia and Settelein, Jochen and Kowal, Julia and Karden, Eckhard and Giffin, Guinevere A.
Pages 2101051
Year 2022
DOI https://doi.org/10.1002/ente.202101051
Journal Energy Technology
Volume n/a
Number n/a
Abstract Including a certain amount of carbon in the negative active material is currently the state-of-the-art method to improve the dynamic charge acceptance (DCA) of lead-acid batteries. The DCA is a key parameter of batteries used in micro-hybrid cars where brake energy recuperation is implemented. To find the optimal carbon additive, it is essential to test the carbon both in short-term and long-term tests. This work investigates the long-term and short-term DCA of 2 V, 2.5 Ah lead-acid cells and correlates the results with the external surface area of the carbon. Five different carbons with tailored particle size (27 nm – 633 nm) and external surface area (7.1 m2 g-1 – 159.3 m2 g-1) were employed as additives in the negative electrodes. The charge acceptance of cells according to the charge acceptance test 2 (SBA), the DCA (EN) test and the Run-in DCA test (Ford) is increased via an increase in the carbon external surface area. A correlation between the short-term tests and the first weeks of the Run-in DCA test is established for the carbon impact. After several weeks of Run-in DCA test, the carbon effect is diminished and only a differentiation between high and low DCA cells is possible. This article is protected by copyright. All rights reserved.
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