TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Compression System: The fibers are composed of several different materials. The frame includes multiple layers, friction-reducing layer located adjacent to at least one of the multiple layers or at least two opposing wall surfaces that form at least a portion of the continuous border. The compression system further comprises at least one end block, where the frame is further configured to contain at least one end block at an end region of the electrochemical cell stack. The compression system further comprises at least one compression mechanism, where at least one compression mechanism is configured to apply compressive force to the electrochemical cell stack. The compression mechanism includes at least one of gib or block configured to expand in response to increase in temperature. The compression mechanism includes one or more internal drive screws extending between two separate portions, where rotating the internal drive screws in a first direction moves the two separate portions further away from each other and rotating the internal drive screws in a second direction moves the two separate portions closer to each other. The compression mechanism includes internal drive screws configured to increase the size of the compression mechanism when the internal drive screws are rotated in a first direction and to decrease the size of the compression mechanism when the internal drive screws are rotated in a second direction opposite the first direction. The structure is formed of wound fibers. The fibers are non-conductive. The height of the structure along the axis of the electrochemical stack changes in response to a load applied by the compression mechanism to the electrochemical stack when containing the compression mechanism. The fibers are configured to stretch and contract in response to changes in the compressive force, where at least one compression mechanism includes at least one of a gib or an expandable element. Preferred Method: The compression mechanism configuring the compression mechanism involves wedging a gib against another gib, increasing the temperature of the compression system to expand the compression mechanism, or rotating several internal drive screws to expand the compression mechanism. EXAMPLE - None given.