IMPCELL

Using impedance analysis as a diagnostic method in fuel cell system operations

Current efforts to reduce greenhouse gas emissions in the transport sector must be intensified to achieve globally defined climate targets. Therefore, fuel cell electric vehicles (FCEVs) represent considerable potential as a clean and sustainable alternative to conventional combustion engines, especially for applications that require long ranges and high performance.

To develop FCEVs to be market feasible, suitable onboard diagnostic instruments for the fuel cell stack must be developed. Electrochemical impedance spectroscopy (EIS) is a promising diagnostic method for this purpose. In particular, the ease with which EIS can be integrated into existing FCEV infrastructures is considered a decisive advantage of this method. However, a number of challenges that must be evaluated and better understood remain before EIS can be implemented as an onboard diagnostic tool. Therefore, modern EIS methods are being evaluated in this project, particularly relating to the required signal-to-noise ratio and frequency range, so the requirements and limitations of the different methods can be compared with each other. Additionally, the use of different data analysis methods, such as model-based or model-free methods, will be systematically analysed. Based on the evaluation of the measurement and analysis, relevant implementation options will be identified and evaluated in a second step. The possible use of fast and high resolution measurement technology, modern power electronics systems, and signalling devices will be included in the assessments. In a final step, specific performance indicators will be developed to systematically analyse and compare the various implementation options.

Project lead: Prof. André Leonide (H2Ohm Institute)

Researchers: Mertkan Özcan, M.Eng.; Omar Elattar, M.Sc.; Josef Knoblach, M.Eng..

Project partners: Prof. Armin Dietz (H2Ohm Institute) and Prof. Marcelo Lobo Heldwein (TU München)

Funded by: FVV e.V.

Funding period: 1 January 2024 - 30 June 2025