NOVELTY - The stack has a set of bipolar plate arrangements for separating a set of membrane electrode arrangements from each other. The plate arrangements comprise anode plates (6), cathode plates (7) and common reference apertures (30, 31) i.e. fluid ports, that are aligned with each other. A set of non-electric conductive annular or disk-shaped alignment components (20) is formed for each adjacent pair of apertures in the adjacent plate arrangements and engages with the apertures of the anode and cathode plates of the adjacent plate arrangements. The alignment components are made of polymer.    USE - Solid material polymer electrolyte fuel cell stack for use in automotive and commercial applications for converting an electrochemical reactant in form of a fuel and an oxidant e.g. hydrogen, oxygen and air, to produce electric power.    ADVANTAGE - The set of non-electric conductive annular or disk-shaped alignment components is formed for adjacent pair of common reference apertures in the adjacent plate arrangements and engages with the apertures of the anode and cathode plates of the adjacent bipolar plate arrangements, thus enabling alignment of the bipolar plate arrangements in a simple and better manner during assembly of the stack. The utilization of alignment components improves structural stability of the assembled stack, so that the stack is less susceptible for breakage, thus enabling reduction of hazards caused during manufacturing of the stack, and hence reducing manufacturing cycle time and costs of capital goods.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for aligning a set of bipolar plates during assembly of a solid material polymer electrolyte fuel cell stack.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic, side perspective sectional view of an edge of a framed membrane electrode arrangement comprising an alignment component.    Anode plates (6)    Cathode plates (7)    Annular or disk-shaped alignment components (20)    Central hole (21)    Common reference apertures (30, 31)