Project Develops Energy Storage From "Second-Life" Batteries

The opened container of the second-life energy storage system Copyright: © PEM RWTH Aachen University

In September 2021, the research project "Intelligent and flexible system for the use of any second-life batteries in municipal charging infrastructure" (Fluxlicon) was launched. Until the end of August 2024, the project is developing key findings for a future circular economy in mobility. To this end, "Fluxlicon" is developing and piloting a modular and flexible energy storage system from batteries that, with around 80 percent remaining battery life, are no longer suitable for further use in electric vehicles. The architecture of the storage system provides a grid interface for the integration of renewable energy as well as "fast charging" for a quicker and more cost-effective setup of charging facilities.

Second-life storage "Gigabatt" is being built in Aachen

With the chair "Production Engineering of E-Mobility Components" (PEM) of RWTH Aachen University and the other project partners Agentur für Erneuerbare Energien e.V. (AEE), PEM Motion, ConAC and DEKRA, a "Trusted Platform" is being developed as part of the project. It acts as an interface between the distributors of electric vehicle battery systems as well as the secondary users, and it provides all data relevant for the further application of used battery systems. To validate the results, the second-life storage system "Gigabatt" with a capacity of one megawatt hour will be set up in Aachen. Additionally, an intelligent energy management system will be developed for data transfer back to the "trusted platform". In the further course, the focus will be on the construction and testing of two pilot plants in two different German municipalities. Both locations will be determined via a nationwide competition.

For resource efficiency and lower CO2 emissions

The background to the project is the ever-increasing importance of electromobility. However, there is criticism with regard to sustainability and the use of resources: the batteries require raw materials, production causes CO2 emissions, and after their useful life in the vehicle, many batteries are recycled directly despite their high residual capacity. In order to keep batteries in use as long and efficiently as possible in the future, initial concepts for "second life" applications have already been developed, allowing battery systems from electric vehicles to have a "second life" in stationary energy storage systems.

Further information is provided on the project's official website (German) and in this press release.



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The project

  • "Fluxlicon": Intelligent and flexible system for the use of any second-life batteries in the municipal charging infrastructure

Research objectives

  • Development and production of modular energy storage systems based on former traction battery systems
  • Integration of the storage systems into municipal infrastructures
  • Development of an algorithm for rapid characterization of the condition of any "second life" batteries
  • Development of a "trusted platform" that provides the data relevant for the reuse of used battery systems in a structured manner

Research and project partners

PEM of RWTH Aachen University
Agentur für Erneuerbare Energien e.V.
PEM Motion
ConAC (German)
DEKRA (German)


  • 09/01/2021 through 08/31/2024

Project management

DLR Projektträger

Funding code

  • 01MV21006C


Federal Ministry for Economic Affairs and Climate Action (BMWK)