We are excited to announce that BATSS successfully achieved another significant milestone: the completion of the cell electro-thermal preliminary model. This milestone, reached within Work Package 3 (WP3) and led by our partner IFPEN, marks a crucial step forward in our mission to enhance the safety and performance of battery systems through advanced modeling and simulation techniques.
The primary objectives of WP3 revolve around optimising thermal performance and mitigating thermal safety risks in battery systems. This is achieved through precise modeling, simulation activities, and the selection of effective safety measures. This milestone represents a pivotal point in this process, where a foundational electro-thermal model has been established.
This preliminary model is built on the NV 4695 cell data sheet and serves as the initial step towards a fully calibrated model based on experimental data from the BATSS project. This early-stage model will be instrumental in building a full battery pack simulation, enabling us to evaluate various aspects rapidly and effectively.
Methodology and approach
IFPEN employed a rigorous methodology to develop and validate the electro-thermal model, which included the following steps:
- Build a simulation protocol: Establishing a structured simulation framework to guide the modeling process. [1]
- Evaluate quasi-static approach: Assessing the electro-thermal behavior under static conditions. [2]
- Evaluate RC dynamic approach: Testing the model’s dynamic response using an RC circuit representation. [2]
- Validation with temperature profile from datasheet: Comparing model outputs with temperature data provided by the cell supplier. [3]
Through these steps, two electro-thermal models were constructed: a quasi-static model and an RC dynamic model.
Key outcomes
- Two electro-thermal models were successfully built using data provided by the cell supplier. These models were tested under constant current charge and discharge at a nominal current (1C).
- The quasi-static model effectively represents the electro-thermal behavior in simpler simulation protocols, providing a solid foundation for further development.
- While the RC dynamic model uses data from industrial NMC-SiC cells, its thermal response was found to be less accurate than the quasi-static model in this preliminary phase.
Next Steps
Moving forward, the team will focus on the following:
- Full calibration of the RC model: As experimental data becomes available, the RC dynamic model will undergo complete calibration, enhancing its accuracy and reliability.
- Application of the quasi-static model: This model will be used as a preliminary tool to evaluate the battery thermal management system.
In the initial months, IFPEN utilised a generic cell electro-thermal dynamic model, calibrated based on a commercial generic model, to lay the groundwork for further BS (Battery System) modeling activities. As more modeling data becomes available, IFPEN will refine this into a customised 1D electro-thermal model, which will work alongside a 3D approach to inform the development of a complete BS simulator. This simulator, expected to be ready by December 2024, will include aging and safety submodels, adding significant value to our ongoing research.
With this milestone now complete, BATSS continues to advance towards our next objectives. Following this achievement and the recent completion of the “Battery System initial specifications, requirements, and challenges” milestone by FMF, we are preparing for the upcoming milestone led by CID: “Review of the overall activity related to design, modeling, simulation, manufacturing, recycling, second life, and standardisation,” expected by March 2025.
Stay tuned as we continue to push the boundaries of battery technology, making strides in safety, efficiency, and sustainability.
