Energy accumulator device

The invention relates to an energy accumulator device for connecting a first voltage network (21) having a first voltage level to at least a second voltage network (22) having a second voltage level,wherein the first voltage level is higher than the second voltage level, wherein a plurality of module strings is present, in each of which a number of battery cell modules (Cx) is provided and said battery cell modules are interconnected, wherein the module strings (30, 31, 32, 34, 40, 41, 42, 43) are connected in parallel with each other, wherein a plurality of battery cell modules (Cx) connected to each other alternately in parallel or in series by means of a switching elements is present in each module string. 本发明涉及种用于将具有第电压水平的第电压电网(21)与具有第二电压水平的至少个第二电压电网(22)连接的能量储存设备，其中所述第电压水平高于所述第二电压水平，其中存在多个模块链，在所述模块链中分别设有和连接有多个电池单元模块(Cx)，其中所述模块链(30，31，32，33，34，40，41，42，43)能够彼此并联连接，其中在每个模块链中存在多个电池单元模块(Cx)，所述电池单元模块能够经由开关元件交替地彼此并联连接或者串联连接。