TU Berlin

Electrical Energy Storage TechnologySiCWell

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Influence of silicon carbide inverters on the lifetime of the batteries of EVs

  • Collaborative project
  • Partners: Daimler AG, Solfas Technologie GmbH, dept. PE and MDT of TU Berlin
  • Sponsored by BMBF
  • Project duration: 09/2018 - 08/2021
  • Subproject: Experimental investigation, modeling and diagnosis of aging of batteries of EVs caused by SiC inverters


Innovations in electronics will further increase the efficiency of electric vehicle propulsion systems and hence the range. Power electronics control the energy flows in the vehicle. The use of silicon carbide (SiC) semiconductors enables more efficient and thus more compact power electronics. Intelligent monitoring and control systems will ensure the reliability of future drives, even in the event of a fault.

Aims and objectives

The usually high switching frequencies of the SiC power electronics affect the battery, the propulsion system and the electrical system of electric vehicles. Although largely unexplored so far, this could negatively impact the system performance. The SiCWell project aims to investigate the effects of the fast switching SiC power semiconductors on the lifetime of vehicle batteries. This will be done in aging tests on lithium-ion cells in the laboratory. The operating parameters of the power electronics will be selectively varied. Based on the results of the aging tests, a simulation model is to be developed which models the influences of SiC power semiconductors on the battery system and makes it possible to predict interactions.

Innovations and perspectives

In future, on the basis of the simulation model, possible effects of high switching frequencies on the aging behavior of the battery can already be taken into account during the development of SiC inverters. This can prevent adverse effects and increase the performance and reliability of electric vehicles. In addition, the planned investigations might lead to methods for the online-Lifetime-diagnosis of battery systems.


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