Intelligent 4-Cell Lithium Battery Management with CAN/LIN Interface

The RD9Z1-638-4Li reference design is a Battery Management System (BMS) for 4-Cell Li-Ion battery applications featuring the MM9Z1_638 Battery Sensor Module. The RD9Z1-638-4Li is built to demonstrate the product capabilities in a 4-cell Li-Ion application where high EMC performance is required to obtain high accuracy measurements on key battery parameters. The board features an 8-pin standalone CAN transceiver to interface with other modules. Very high EMC robustness and performances are achieved by the Freescale MC33901 CAN High-Speed Transceiver. For cell balancing function and general purpose switches, the board features the Freescale MC33879 Configurable Octal Serial Switch.

The design is useful to automotive applications such as engine management, climate controls, communication, and safety systems. The circuit's function is suitable for a hybrid electric vehicle which monitors the condition of individual cells, make up the battery and maintains all the cells within the operating limits. It also provides information on the State of Charge (SOC) and State of Health (SOH) of the battery.