At the 2024 CTI Symposium in Berlin, Marelli presented its latest development in Battery Management Systems (BMS) for automotive applications. The new system incorporates Electrochemical Impedance Spectroscopy (EIS), designed to improve battery cell management, enhance battery pack performance, and support optimal operation.
The battery management system functions as an electronic control unit that monitors the state of cells within a battery pack. It ensures safe operation by maintaining the cells within specified voltage, current, and temperature ranges. Over time, lithium-ion batteries experience degradation, leading to capacity reduction and increased resistance. The integration of EIS into Marelli’s BMS offers specific insights into battery degradation, enabling more accurate assessments of the remaining useful life and residual economic value of batteries.
Previously considered an expensive laboratory tool, EIS has been adapted by Marelli into a cost-effective solution suitable for large-scale production. This system can detect early anomalies, helping to prevent issues like thermal runaway. The current version of the Marelli Energy BMS platform, known as “EIS Ready,” introduced improvements such as measuring impedance at lower frequency ranges. The next-generation “Full EIS” BMS, scheduled for release in 2025, is expected to expand these capabilities by enabling higher frequency measurements and providing a more comprehensive evaluation of each battery cell’s condition.
The new BMS platform also integrates advanced cloud tracking and artificial intelligence applications, enhancing the calculation algorithms used for real-time estimations of the State of Charge (SoC) and State of Power (SoP). These features allow for precise assessments of a battery’s remaining useful life and degradation, contributing to longer battery life, improved vehicle performance, and extended driving range.
Giovanni Mastrangelo, Chief Technology Officer of Marelli’s Propulsion Solutions business, highlighted the role of EIS and AI in advancing BMS technology. He stated that these innovations are expected to enhance safety, reliability, and performance standards in battery management for electric vehicles in the coming years.
Marelli is showcasing these advancements at the CTI Symposium in Berlin on December 3 and 4, where Davide Cavaliere, Product Manager for Battery Management Systems, is delivering a keynote speech titled “Electrochemical Impedance Spectroscopy (EIS) Implementation in Battery Management Systems (BMS).” The session will focus on the development process, design challenges, and future improvements in Marelli’s BMS technologies.