Electrical Energy Storage

Prof. Dr.-Ing. Oliver Bohlen

The research group Electrical Energy Storage focuses on systems for storing electrical energy - primarily batteries - and the respective applications such as electric vehicles, ancillary services, home storage systems, e-bikes, etc.

The thematic focus is on battery system technology, i.e. everything that goes with it to turn battery cells into a functioning overall system. This includes:

  • Battery characterization, such as pulse and capacity tests, impedance spectroscopy, thermal analysis
  • Modelling and simulation of electrical, thermal and ageing behaviour using tools such as Modelica, Python and Matlab/Simulink
  • Battery management systems and algorithms for state-of-charge and state-of-health monitoring, energy management and optimal power flow in storage systems
  • Battery electronics, prototyping for battery systems and BMS electronics for e-bikes and other applications

Rooms

The laboratory is located in room E0202, in the basement of the E-Building (room finder). Further workplaces are currently located in the Systems Engineering Laboratories E002/3, E006 and E211/212. Some of the experimental setups for the research projects are located on project area B0172.

Equipment

The equipment in the Electrical Energy Storage Laboratory is used for both teaching and applied research.

There is a fully automated test bench for the characterization of battery cells and battery modules:

  • 6 test channels 80 V / 100 A for testing battery modules
  • 24 test channels 6 V / 30 A for testing battery cells
  • 3 temperature chambers
  • Additional modules for recording cell voltages, temperature measurements and CAN messages
  • Comprehensive security technology

The laboratory's equipment also includes:

  • 5 impedance spectrometer
  • Multi-channel high-current impedance spectrometer
  • Regenerative electronic load and source (up to 750 V, 30 kW)
  • Workplaces for setting up and testing battery electronics
  • Programmable laboratory power supplies for battery tests on cells and modules up to 60 V / 120 W
  • Laboratory power supply 100 V / 3300 W
  • Internal resistance meter
  • Oscilloscope, multimeter, laboratory power supplies, soldering station, etc.