Method for Starting Up a Battery System Having a DC Voltage Intermediate Circuit

A battery comprising:

• a control unit;
• and
• a plurality of series-connected battery modules, each series-connected battery module including (i) a coupling unit and (ii) at least one battery cell that is connected between a first input and a second input of the coupling unit,
• wherein the control unit is configured to perform a method configured to start up a battery system,
• wherein the battery system includes the battery, a DC voltage intermediate circuit that is connected to the battery, and a drive system that is connected to the DC voltage intermediate circuit,
• wherein the method includes
• a) disconnecting the battery cells of all the series-connected battery modules by transmitting a corresponding control signal to the coupling units of the series-connected battery modules,
• b) providing a bridge on the output side of all the series-connected battery modules so that an output voltage of the battery is zero,
• c) connecting the battery cells of one of the series-connected battery modules and terminating the bridge on the output side of the one of the series-connected battery modules by terminating the transmission of the corresponding control signal to the coupling unit of the one of the series-connected battery modules, and
• d) repeating the step c) for in each case a further one of the series-connected battery modules at least until a voltage of the DC voltage intermediate circuit achieves a first desired operating voltage.

A battery system comprising:

• a battery including (i) a control unit and (ii) a plurality of series-connected battery modules, each series-connected battery module including a coupling unit and at least one battery cell that is connected between a first input and a second input of the coupling unit;
• a DC voltage intermediate circuit connected to the battery;
• and
• a drive system connected to the DC voltage intermediate circuit,
• wherein the control unit is configured to perform a method configured to start up the battery system,
• wherein the method includes
• a) disconnecting the battery cells of all the series-connected battery modules by transmitting a corresponding control signal to the coupling units of the series-connected battery modules,
• b) providing a bridge on the output side of all the series-connected battery modules so that an output voltage of the battery is zero,
• c) connecting the battery cells of one of the series-connected battery modules and terminating the bridge on the output side of the one of the series-connected battery modules by terminating the transmission of the corresponding control signal to the coupling unit of the one of the series-connected battery modules, and
• d) repeating the step c) for in each case a further one of the series-connected battery modules at least until a voltage of the DC voltage intermediate circuit achieves a first desired operating voltage.