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    • 17. 发明专利
    • Manufacturing bipolar- or electrode plates with flow-fields, for fuel cells or electrolysis stacks, employs continuous winding of wire conductors with selective plastic over-injection molding
    • DE102007025828A1
    • 2008-12-04
    • DE102007025828
    • 2007-06-02
    • MARTIN MICHAEL
    • MARTIN MICHAEL
    • H01M8/02C25B11/00H01M4/88
    • In the flow-field region, the bipolar- or electrode plates (1) have a central field (3) of wires (2). These are made from electrically-conductive, corrosion-resistant metal. The wires are partially over-injection molded with plastic. Wires on opposite sides of the flow field (3) are mutually-offset. Near the flow field, on both sides of the plate, the wires are up to one half-covered with over-injection molded plastic, or are fixed in a pre-injected plastic half-shell. The wires are wound continuously from side to side. Channels (8, 9) between the wires, guide reagent flow. These are produced in the injection process, in finished or pre-finished form. The wires are mounted in an outer sheet metal frame, to which they are soldered. A plastic frame (6) and seal (7) are over-injected at the locations of soldered connection, on both sides of the flow field. The wires are placed against tabs (4a, 4b), which are raised-up from the sheet metal frame. A membrane with a gas diffusion layer is located between opposite wires of the plate. Channels (8, 9) in the flow field (3) between opposite wires, are in parallel arrangement, such that the wires on both sides press against the gas diffusion membrane. Similar sections are stacked. An electrode plate section includes distribution channels and connections for the reagent and a membrane electrode unit (MEA). In the same plane, several adjacent cells are arranged in a series- or parallel circuit. Distribution to the electrode unit matches the conductive diffusion layer with the size of the flow field. End plates at each end of the stack, clamp the stacked sections and their seals. The end plates have connections for reagent supply and return. High temperature plastic used in the surface coating between the MEA and the anode or cathode, resists temperatures of 180[deg] C-260[deg] C over the long term. It is polyphenylene sulfide. The plastic for the flow field (3) and the plastic frame (6) includes a seal (7) of thermoplastic elastomer (TPE). The seal is made from PTS-Thermoflex V50-710 (RTM;plastic sealing material). An independent claim IS INCLUDED FOR the bipolar- or electrode plate.