Battery management system and associated method for determining a state of charge of a battery, battery with battery management system and motor vehicle with battery management system

摘要

A battery management system (21) is disclosed which comprises a control unit (15) and one or more cell monitoring units (31) for monitoring in each case a plurality of battery cells (14) of at least one battery module of a battery, the cell monitoring units (31) each having a microcontroller (33), which is connected by a first communication connection (19) to the control unit (15), and a measuring electronics for detecting one or more measured variables from the battery cells (14). Furthermore, the measuring electronics of each cell monitoring unit (31) is at least partially redundant, so that in the cell monitoring unit (31) a measured variable, in particular an electrical voltage, by means of several measuring units (32, 34, 42, 43) can be detected several times, and each cell monitoring unit (31) has means for current detection. The microcontroller (33) is designed to calculate a state of charge. Furthermore, a method for monitoring a battery is provided. In addition, a battery with a battery management system and a motor vehicle with a battery management system are disclosed.