The role of the Battery Management System, which is a core and smart component in the complex architecture of EV power management.
Marelli, a global automotive supplier, has expanded its range of battery management technologies for electric vehicles with a new Wireless Distributed Battery Management System (wBMS). This technology eliminates the hardwired physical connections normally required in other Battery Management System (BMS) architectures, providing greater flexibility, increased efficiency, improved reliability and lower costs, all critical aspects in electric vehicles. Marelli will make the solution available from Q2 2022 to support customer launch in 2024.
The solution eliminates the need for daisy-chain communication and wiring by using wireless technology to enable communication between batteries and control unit. Compared to previous wired distributed solutions, the new wBMS developed by the company reduces the wiring harness by 90% and simplifies the construction and installation of the battery cell. In particular, the wBMS reduces mounting complexity and provides greater flexibility for battery module placement.
The reduced weight resulting from the removal of the connectors provides greater energy efficiency, increasing the range of the vehicle with the same load. The solution also frees up space in the battery pack to accommodate larger batteries, ensuring versatility, scalability and optimization; eventually, under the right conditions, larger batteries also translate into improved power performance and again greater vehicle range.
“Wireless BMS is a real game-changer for the automotive industry, eliminating the need for the battery harness, wires and connectors associated with standard wired BMS systems,” said Dr. Razvan Panati, Head of Power Electronics Technology of Marelli’s Vehicle Electrification Division. † “Marelli designed both the wBMS and Wired BMS with identical basic architectures, supported by two different modes of communication and interfaces. In this way, our technology can be applied to multiple vehicle platforms with minimal change. This flexibility of the solution guarantees a significant reduction in engineering costs and enables Marelli to make this high-performance technology affordable for the mass market.”
The Marelli wBMS can be delivered with a software application layer that uses advanced algorithms based on a proprietary technique called “Sensor Fusion”. The algorithms estimate several critical parameters of each battery cell — including state of charge, health, power status — to ensure a more accurate calculation of overall battery health, and inform the other powertrain components accordingly.