TU Darmstadt I, SWIVT

About us

The Technical University of Darmstadt is one of the leading technical universities in Germany involving more than 25.000 students in its educational activities. Through outstanding achievements in research, teaching and transfer, Technical University of Darmstadt continually opens up new opportunities for shaping society. The Institute for Mechatronic Systems is a research and teaching entity affiliated to the Technical University of Darmstadt. Research at the Institute for Mechatronic Systems focuses on mechatronic system development and integration by addressing future-oriented topics, such as the transition to resource-efficient energy and mobility systems.

We are looking for

An indoor 20 kWh lithium-ion battery system targeted at residential applications to be connected to the adjustable 200 to 500 V side of a DC-DC-converter.

About the Storage Challenge

The hybrid storage SWIVT is developed in the framework of the SWIVT-Projects, which aim to enhance the energy balance of existing residential buildings. The integration of energy storage units into residential buildings enables the storage of local renewable energy surplus, facilitating a reduced dependence on the power gird. SWIVT combines a kinetic and an electrochemical unit to a hybrid energy storage system. The synergistic combination of the two storage technologies creates a novel storage system with improved characteristics in terms of aging, losses and available energy content.

The kinetic and electrochemical units of SWIVT are coupled to a common 750 V DC-link. The common DC-link is integrated through a grid-tie inverter to the mains. The existing battery system is connected to the common DC‑link though a 30 kW DC-DC-converter. This configuration enables the easy replacement of the battery system in order to facilitate the testing of an alternative system. A battery management system that includes safety functions and delivers important information about the battery status on a fieldbus is highly recommended. In this way, the integration of the battery system to the central energy management is enabled.

A layout of the designated system distinguishing between already available parts (blue) and required parts (red) is depicted in the picture below.

Usable Capacity: 20 kWh

Power, discharging cont.: 30 kW

Power, charging, cont.: 30 kW

Voltage level: 200 - 800 V; DC

Temperature range: 10 °C - 40°C

site: indoor

headword / technology: open for different energy storage

Further Information

More Information and contact details for the hybrid storage SWIVT can be found here.