Energy storage element

An energy storage element for providing a voltage, the energy storage element comprising:

• a first control apparatus;
• modules each having an energy storage unit, a connection unit and a module control apparatus, which connection units are connected between two associated modules and have first switches;
• the connection units are configured to enable, on a basis of a state of the first switches, at least two connections from the group of connections including (i) parallel connection of the two modules, (ii) serial connection of the two modules, and (iii) bridging of at least one of the two modules;
• two first outputs for providing the voltage of the energy storage element, and in which the first control apparatus is configured to control the module control apparatuses on the basis of a predefined desired voltage value in order to influence the voltage of the energy storage element on the basis of a desired voltage value;
• and
• a first measuring apparatus for producing a first measured value characterizing the voltage between the two first outputs, and wherein the first control apparatus is configured to regulate the first measured value to the desired voltage value by reconfiguring the connection units,
• wherein the first control apparatus and the module control apparatus are together configured to enable changing of a control of the associated connection unit during use of the energy storage element in order to reconfigure the energy storage element;
• and
• wherein the first control apparatus is configured to control the module control apparatuses.