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Battery Technical Center


Hermann-von-Helmholtz-Platz 1
76344 Eggenstein-Leopoldshafen, Germany

Building 276

Phone: +49 721 608-26844
Fax:     +49 721 608-28284 
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FastStorageBW II - Development of a Hybrid System of Battery and Capacitor

FastStorageBW II - Development of a Hybrid System of Battery and Capacitor

Project Group:

System Engineering


Ministry of Finance and Economy Baden-Württemberg


Fraunhofer IPA and ICT

University of Stuttgart ISW and EEP

Zentrum für Sonnenenergie- und Wasserstoff-Forschung (ZSW)

Institut für Strahlwerkzeuge (IFSW)

Industrial partners: Varta, SEW, Viastore, Freudenberg, FESTOOL, Daimler, Porsche





Objectives and Results

The aim of the project is to develop a high-performance hybrid storage device, the so-called "power cap", which combines the strengths of capacitors and lithium-ion batteries: power caps combine the fast charging time of a capacitor (within seconds) and the long cycle life (> 100,000 cycles) with the storage capacity of a battery.

They can be used in all fields of activity where uneven load peaks have to be covered or fast charging times are required. These include, for example, recuperation brakes in vehicles for recovering braking energy.


Contents and Approach

The KIT is developing prototypical energy storage modules for selected applications as part of the project. For this purpose, a semi-automated, robot-supported welding system for connecting and interconnecting individual cells to form a complete module will be set up. In addition to a cost-optimized module housing design, KIT is also developing an appropriate cooling concept and a battery management system (BMS) for the prototypes.


Project Volume

25 Mio. €


Further information

Press Release

Innovative Storage Systems with Increased Energy Efficiency

Innovative battery pack assembly solution – a newly developed concept for stationary storage systems