Electronics and software structure of BMS with circuits of BQ769x0 series

Abstract

The current trend for road transport is the transition from fossil fuels to electric drives, which is associated with the use of Li-on batteries. The role of BMS (battery management system) is necessary for correct and safe operation of the battery. This task can in principle be categorized into several sub-parts - power interface electronics, monitoring analog front-end (AFE) circuits, communication peripherals and a central control unit equipped with the appropriate software. The battery management system is used for continuous dynamic monitoring of the flow of electricity and is implemented by supporting circuits of the BQ769x0 series. The choice of a specific circuit mainly affects the variable series combination of cells. The single-processor control unit, outside its energy-saving operating phases, reads the operating information from the AFE circuits with the required period, which is processed by the implemented algorithms. The principle of advanced control requires full control over the connected Li-Ion cells, which are initially thoroughly mapped by the first operating cycles. The central control unit must have an options for recording operating data on the MMC, service USB communication and wireless connection via a Bluetooth module for service tasks.