NEMO project reaches key milestone: zBMS demonstrator acquires one month of data
This achievement marks significant progress toward the project’s goal of optimizing battery management for enhanced performance and safety.
The NEMO project has successfully reached an important milestone with its zBMS demonstrator acquiring one month of operational data. The zBMS is designed to address the limitations of traditional battery management systems, which often rely on limited data and semi-empirical models. By integrating advanced sensor technologies, including electrochemical impedance spectroscopy (EIS), the zBMS platform aims to capture critical data on the battery’s internal electrochemical processes. By combining EIS data with advanced models, the project aims to deliver more accurate state of charge (SoC), state of health (SoH), and state of temperature (SoT) estimations.
Two prototypes based on the zBMS architecture have been prepared by IAV and provided to CSEM and, over the past month, the zBMS demonstrator has gathered crucial data under the supervision of CSEM for this milestone.
CSEM is in charge of several activities in the project, including:
- zBMS and zBMS+ testing using CSEM’s testing equipment, such as battery cyclers and reference EIS systems.
- Hardware development, developing the zBMS+ slave modules and cell-switching solution.
- Algorithms development, and validation of EIS-based SoT, SoC, and SoH estimators. These estimators will be used in combination with the zBMS and compared to conventional estimators. The goal is to demonstrate the benefits of EIS-based estimator recalibration. Additionally, an algorithm for SoH-based cell balancing will be developed for the zBMS+, acting on the cell-switching. Our aim is to demonstrate that smart cell balancing (based on SoH) will extend the pack’s lifetime.
In terms of progress so far, the SoC and SoT estimators have been developed, and the SoC has been integrated into the TTTECH cloud platform. The hardware, including the EIS board and cell-switching board, has been designed and incorporated into the zBMS+ platform in collaboration with IAV.
The final objective is to demonstrate the advantages of the EIS-based recalibration for SoC, SoT, and SoH estimators, ultimately aiming to license these solutions. This will be achieved in combination with the developed hardware, particularly the switching and EIS boards, to advance battery management system technology.
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About CSEM
Inaugurated in 2023, CSEM’s Battery Innovation Hub consolidates all key competencies necessary for battery technology in a single location. CSEM develops and tests innovative solutions in coin cells before scaling up to pouch cells. CSEM also develops innovative sensing solution and BMS. The facility features several climatic chambers and testers for both cells and packs, enabling comprehensive evaluation. Additionally, CSEM engineers are actively engaged in advancing battery management systems, focusing on enhancing SoX estimations.
