A modern fuel cell usually consists of a stack of individual cells that are mechanically pressed together. In MOD FC, pressing is not done mechanically but hydraulically. The complete flushing of separate individual cells with the hydraulic medium ensures homogeneous pressing of the internal cell components. In addition, the hydraulic medium can be used directly as a cooling medium. This ensures that homogeneous power generation takes place over the entire surface and that no service life-shortening hot spots occur.

Based on the concept of the modular fuel cell (see Mod FC), a modular electrochemical energy storage system (E-Cube) can be realized. This is an integrated system consisting of one or more electrochemical converters (fuel cells and/or electrolyser cells) and a storage medium. Hydrogen storage modules are used in the spaces between the pocket inserts (cf. figure), in which the fuel cells or electrolyzer cells are located. These use an optimized metal hydride as the hydrogen storage medium.

This design makes use of thermodynamic effects which serve, among other things, to increase the efficiency of the overall system, since heat is exchanged between the cells in the pockets and the metal hydride modules.