Bipolar plate welding

In view of their mechanical strength and impermeability to gases, metals such as stainless steel, titanium, and aluminum are very attractive. In metals, the channels are readily made by the separate stamping of metal sheets for each side of the bipolar plate and snbsequent welding of the two halves. 

DeNora DN 350 Bipolar Electrolyzer. The DeNora DN 350 bipolar electrolyzers (Fig. 61) is of the filter-press type. The frames are very large (3.5 m ) and are compressed by mechanical screw jacks to ensure proper tightness. The electrolyzer can be operated with a slight overpressure. Anolyte and catholyte are recirculated in the cell by baffle plates and special downcomers. Fresh brine and diluted caustic soda are fed to the bottom section of each compartment. Anolyte with CI2 and catholyte with H2 leave the elements through insert pipes at the bottom of the cell. The electric current flows from the anode to the cathode surface through an array of welded electrical connectors of highly conductive metals (e.g., steel or copper). These connectors are interposed between the titanium anode wall and the nickel cathode wall, to which they are welded. The cathode walls are cold pressed to create a pattern of bulges. 

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