Electrical Energy Storage Lab

Module Number: EI73631

Duration: 1 Semester

Recurrence: Summer Semester

Language: English

Number of ECTS: 5

Staff

Professor in charge: Andreas Jossen

Amount of work

Contact hours: 75

Self-study hours: 105

Total: 150

Description of Achievement and Assessment Methods

In order to evaluate the learning objectives appropriately, the module is tested in the form of a laboratory, which is evaluated as a whole. This consists of the following parts:

• The students carry out the experiments and the teamwork and procedure for the thermal and electrical investigation of the energy storage will be evaluated.

• The ability to perform and understand the experiments will be examined in an oral exam to each experiment in the group or partly in a one-to-one interview and pre-assignments.

The ability to write scientific reports, interpret and evaluate energy storage systems is checked by the group report (10 - 15 pages per experiment). Type of examination: Oral: group examination / one-on-one intervies Practical application of each experiment Report of each experiment

Prerequisites (recommended)

Lecture Batteriespeicher, Batteriesystemtechnik, Energy Storage

Intended Learning outcomes

The students are able to do the following after the course:

• Practically apply the learned theoretical methods for the thermal and electrical characterization of energy storage systems. These are in detail the following characterization methods: o Check-up tests (measuring the U-I characteristic and evaluating the available capacity) on lithium-ion, NiMH, lead-acid batteries and double-layer capacitors with battery testers of BaSyTec and Biologic o Temperature tests using climate chambers and battery testers of BaSyTec and Biologic o Dynamic load with battery test equipment of BaSyTec and Biologic o Determination of efficiency o Electrochemical impedance spectroscopy

• To deal with battery test equipment of BaSyTec and Biologic

• To evaluate energy storage systems based on the standard characteristics, which are obtained by the thermal and electrical characterization • The students understand how to simulate the thermal behavior of a lithium-ion battery using the FEM method.

Content

The laboratory course covers selected topics on electrical energy storage systems, which will be studied within eight practical tests. In addition to fundamentals like measurements of standard parameters such as capacity, energy content, performance and efficiency, some insights into the current state of research (eg. electrochemical impedance spectroscopy, modeling, security issues ...) shall be given. In the context of this course several types of batteries and capacitors will be investigated. Tests: 1. Determination and balancing of SOC 2. Thermal behaviour and determination of the battery efficiency 3. Load profile and the effects on the battery 4. Electrochemical double layer capacitor 5. EIS - determination of the parameters regarding the frequency 6. Dynamic behaviour of batteries 7. Thermal modelling of lithium-ion batteries in ANSYS 8. Safety tests on lithium-ion batteries (excursion)

Teaching and Learning Methods

The modul is a laboratory to teach the students the most common methods for the electrical and thermal characterization of energy storage systems. The students are divided into small groups of 3 students per group. Together in the group, the students prepare for each experiments by self-study. The practical application takes place together with one supervisor per group. The supervisor examine the understanding and knowledge to each experiment of the group. The groups are supervised by the supervisors during the practical application. The groups doing the laboratory independently as possible, whereby the supervisor can intervene by his presence, if necessary.

Media

Introductory Event (PowerPoint) Test instructions with description of the tasks, the equipment and software and the theoretical method Individual discussion with the supervisors (whiteboard is sometimes used)

Jossen, A.; Weydanz, W.: Moderne Akkumulatoren richtig einsetzen, 1. Aufl., Reichardt Verlag, 2006

Vielstich, W.; Hamann, C.H.: Elektrochemie, 4., vollständig überarbeitete und aktualisierte Auflage, Wiley-VCH Verlag, Weinheim, 2005

Newman, J.S.; Thomas-Alyea, K.E.: Electrochemical systems, 3rd ed., J. Wiley, Hoboken, N.J., 2004

Linden, D.; Reddy, T.B.: Handbook of batteries, 3rd ed., McGraw-Hill, New York, 2002

Garche, J.; Dyer, C.K.: Encyclopedia of electrochemical power sources, Academic Press; Imprint of Elsevier, Amsterdam, Boston, 2009