Battery Innovation Days (BID) 2025 returns for its fifth edition as a hybrid event taking place in Graz, Austria and online on 2–3 December 2025. Organised within the European battery research and innovation ecosystem, the conference brings together researchers, policymakers, industry representatives and end users to accelerate progress in battery technologies across Europe. The programme covers the entire battery value chain, from materials and cell design to manufacturing and recycling, with sustainability and industrial impact at its core. The event is hosted by the Styrian Business Promotion Agency (SFG) in Graz.

CIDETEC showcased OPINCHARGE innovation in EIS automation

OPINCHARGE partner CIDETEC Energy Storage was represented at BID 2025 by Dr. Elixabete Ayerbe, Team Leader at CIDETEC. In her presentation, Dr. Ayerbe introduced an Automatic EIS analysis tool developed at CIDETEC to tackle one of the most common challenges in battery diagnostics. Electrochemical Impedance Spectroscopy (EIS) is a powerful technique, but its interpretation is often slow and highly dependent on expert knowledge. Traditional workflows typically involve manual data cleaning, commercial software, and careful fitting of equivalent circuit models, which can take around 30 minutes per single result. For long-term degradation studies, this quickly becomes a major bottleneck.

From raw spectra to usable insights

The Automatic EIS tool addresses this issue through an end-to-end automated workflow. Starting from raw EIS measurements, the tool processes the data, selects an appropriate equivalent circuit model, performs the fitting, and extracts the key parameters automatically. In simple terms, it turns complex impedance spectra into clear and comparable results without the need for repeated manual intervention. This approach supports automation, consistency and scale, which are essential for operando and ageing studies involving large datasets.

A clear advantage when scaling up experiments

The benefits become especially clear in large studies. In an operando EIS campaign covering 500 charge–discharge cycles at 30%, 60% and 90% state of charge, the automated tool completed the full analysis in just over 50 seconds. Performing the same task manually would have required around three hours of researcher time. This dramatic reduction in analysis time enables larger experimental matrices and faster iteration between hypothesis, testing and model refinement within OPINCHARGE.

OPINCHARGE selected for the Battery2030+ Innovation Uptake Session finals

The innovation presented by CIDETEC Energy Storage within OPINCHARGE was selected for the live finals of the Battery2030+ Innovation Uptake Session at Battery Innovation Days 2025. This selection followed a competitive evaluation process with a high number of submitted proposals, highlighting the strong innovation potential and industrial relevance of the Automatic EIS analysis tool. Finalists will pitch their solutions live in Graz in front of industry representatives, making this session a unique opportunity to gather feedback, test the value proposition, and explore future collaborations.

Why this matters for OPINCHARGE

OPINCHARGE aims to unlock a deeper understanding of battery interfaces and charge transport under realistic operating conditions. Automated and reproducible EIS analysis strengthens the project’s ability to track degradation signatures over long cycling campaigns. At the same time, tools that transform complex diagnostics into scalable and reliable datasets help bridge the gap between fundamental research and industrial decision-making, supporting the ambitions of Battery 2030+ and the wider European battery ecosystem.