Software / AI

Automotive BMS Above 12 V BMS Architectures and Requirements

BMS ensures the operation and the safety of the battery. Automotive BMS must comply with the most stringent Safety Requirement as described into ISO 26262. Cell Monitoring Circuit is matching the numbers of cells stacked in serial in the battery pack, every cell is monitored. Different cell monitoring circuit will cover from a single cell to multiple cells. They will also cover the cell balancing function. In system, where the control function, run by a microcontroller, is powered from another voltage than the battery pack, there is need for an isolated communication between the control function and the cell monitoring circuits. This isolated communication might be through wired or wireless communication. BMS will also run the connection and disconnection function from the system. Disconnecting is the higher protection of the battery pack.

Low to High Voltage BMS shared a common architecture. Selection of the proper components is key to run the safe operation, to enhance the stored energy and life time of the battery pack. A123 Systemsʼ Li-Ion starter battery, open with BMS

Simplified Automotive BMS diagrams 123456

Extracted from the PDF; charts and images may read imperfectly.