Electrode stack designs

Two basic types of electrode stack designs are used for aerospace cells (i) The back-to-back design of Comsat [96] and (ii) the recirculating design developed by a USAF team working with the Hughes Company [97]. Figure 8.43(a) shows the... 

Fig. 8.43 Aerospace Ni-H2 battery cell electrode stack designs (a) back-to-back (Comsat version) and (b) recirculating (US Air Force...

Electrode stack design (compression, electrode thickness, aspect ratio of height to... 

Figure 19.14 Overcharge pressure characteristics Eagle Richer split negative electrode stack design, seaied nickel-cadmium cell. Charge 200%, rate C/5, temperature 20 C (Courtesyof Eagle...

Figure 19.16 Overcharge pressure against electrolyte quantity Eagle Richer split negative electrode stack design sealed nickel-cadmium cell. Charge250%, rate C/10, temperature 20°C (Courtesyof Eagle Pichei)...

Figure 19.17 shows a laboratory test cell system designed for evaluation of various nickel-hydrogen electrode and electrode stack designs. The system offers a very heavy-duty pressure vessel capable of withstanding virtually any pressure developed during system tests, and offers a convenient means of instrumentation to obtain various data of interest. In this case pineapple slice electrode designs are stacked... 

Other important parts of the cell are 1) the structure for distributing the reactant gases across the electrode surface and which serves as mechanical support, shown as ribs in Figure 1-4, 2) electrolyte reservoirs for liquid electrolyte cells to replenish electrolyte lost over life, and 3) current collectors (not shown) that provide a path for the current between the electrodes and the separator of flat plate cells. Other arrangements of gas flow and current flow are used in fuel cell stack designs, and are mentioned in Sections 3 through 8 for the various type cells. 

Despite the advanced technology of the AQUATECH System, its installation is not complex. In fact, it is simpler and less costly than conventional electrolysis processing. AQUATECH Systems need only two electrodes for an entire 100-150 cell unit stack, avoiding complicated busbar arrangements. Furthermore, scale-up and installation of the unit are facilitated by the modular skid mounted cell stack design. 

A typical electrodialysis stack design is shown in Figure 8. An electrodialysis stack is essentially a device to hold an array of membranes between electrodes in such a way that the streams being processed are kept separated. 

The stack design of AFCs is different from the most common designs of PEFCs or SOFCs. The stack design is similar to that of standard primary batteries. AFCs often have a liquid alkaline electrolyte in two cell chambers that are divided by electrodes... 

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