Electric energy storage device and method for increasing the voltage at the storage device terminals
An electric energy storage device includes two electrical terminals. The energy storage device further includes at least one first current path configured to electrically connect to the two terminals. The energy storage device further includes at least two energy storage modules configured to be connected to form a series connection of the energy storage modules. The energy storage modules include multiple storage units and a controllable multiple-voltage level converter. The converter is configured to optionally connect the one or more storage units in the first current path for the incremental adjustment of a module voltage, as at least one of a function of a control signal of a control and regulating device of the electric energy storage device.
1. An electric energy storage device, comprising:
two electrical terminals;
a first current path configured to electrically connect the two terminals;
a first energy storage module configured to be connected to form a series connection of a plurality of energy storage modules in the first current path, the at least one energy storage module including:
a first plurality of storage units,
and
a controllable multiple-voltage level converter comprising:
two series-connected diodes; and
a first switching device including four switches connected to the first plurality of storage units and to the two series-connected diodes, wherein the controllable multiple-voltage level converter is configured to operate the first switching device to connect at least one or more than one of the first plurality of storage units in the first current path for incremental adjustment of a module voltage based on a control signal of one of a control device and a regulating device of the electric energy storage device; and
a second energy storage module connected in the first current path to the first energy storage module, the second energy storage module including:
a second plurality of storage units, and
a second switching device including two switches configured to connect each of the second plurality of storage units to the first current path in a first configuration in which a first switch in the second switching device is closed and a second switch in the second switching device is open and to short-circuit a section of the first current path that is included in the second energy storage module to bypass each of the second plurality of storage units in a second configuration in which the first switch in the second switching device is open and the second switch in the second switching device is closed.
2. The energy storage device as claimed in claim 1 , wherein the first energy storage module includes the controllable multiple-voltage level converter that produces a maximum voltage of the first energy storage module that is at least twice as high as a voltage of each storage unit in the first plurality of storage units of the first energy storage module.
3. The energy storage device as claimed in claim 1 , wherein a maximum voltage of the first energy storage module is 120 volts.
4. The energy storage device as claimed in claim 1 , further comprising:
a capacitive component configured to act as an intermediate-circuit capacitor and arranged in a second current path between the terminals.
5. The energy storage device as claimed in claim 4 , further comprising:
a converter device connected to the two terminals in parallel with the second current path including the capacitive component.
6. The electric energy storage device as claimed in claim 1 , wherein the electric energy storage device is a battery device.