Battery system with DC / DC converter in the high-voltage network for supplying a microcontroller

摘要

A battery system with a high-voltage network and a low-voltage network is introduced. The high-voltage network comprises a high-voltage battery with a plurality of series-connected battery cells (10-1, ..., 10-n) and a first microcontroller (20), the low-voltage network a second microcontroller (15). The first microcontroller (20) and the second microcontroller (15) are connected by a data bus, which is designed to transmit data via a first isolator (14) arranged between the first and the second microcontroller (20, 15). The high-voltage battery has at least one cell monitoring unit (11-1, ..., 11-n) which is connected or connectable to the first microcontroller (20) and which is designed to detect cell voltages of the battery cells (10-1, ..., 10-n) ) and to transmit the measured cell voltages to the first microcontroller (20). According to the invention, a DC / DC converter (21) connected to the high-voltage battery is provided, which is designed to generate an operating voltage for the first microcontroller (20) from a voltage output by the high-voltage battery and to output it to the first microcontroller (20) .