Abstract: A battery device with a battery module that includes multiple secondary cells, and the battery module is provided with a positive pole and a negative pole. Moreover, the battery module is placed inside an insulating housing with a contact element, which is connected to the positive pole and to the negative pole and through which the positive pole and the negative pole may be connected to an electronics unit of a battery system. Moreover, the invention relates to a battery system and a method for assembling a battery system.

Abstract: A battery device with a battery module that includes multiple secondary cells, and the battery module is provided with a positive pole and a negative pole. Moreover, the battery module is placed inside an insulating housing with a contact element, which is connected to the positive pole and to the negative pole and through which the positive pole and the negative pole may be connected to an electronics unit of a battery system. Moreover, the invention relates to a battery system and a method for assembling a battery system.

Abstract: An energy storage device for storing energy for a stationary AC voltage grid includes a control device; and at least two switching units. Each switching unit includes multiple storage elements for storing a part of the energy, a converter having an AC voltage connection for connection to the AC voltage grid and a DC voltage connection, and a multiplexer switching device electrically connected with the DC voltage connection of the converter and with one of the storage elements via a respective storage connection. The multiplexer switching device is configured to select one of the storage connections in dependence on a selection signal generated by the control device and to electrically connect only the one storage connection selected by multiplexer switching device with the DC voltage connection of the converter.

Abstract: An energy storage device for storing energy for a stationary AC voltage grid includes a control device; and at least two switching units. Each switching unit includes multiple storage elements for storing a part of the energy, a converter having an AC voltage connection for connection to the AC voltage grid and a DC voltage connection, and a multiplexer switching device electrically connected with the DC voltage connection of the converter and with one of the storage elements via a respective storage connection. The multiplexer switching device is configured to select one of the storage connections in dependence on a selection signal generated by the control device and to electrically connect only the one storage connection selected by multiplexer switching device with the DC voltage connection of the converter.