Page 214 - Uninterruptible Power Supplies

Batteries
212 Chapter Seven

Pocket Plate
There are two basic types of plate structure, a thick plate comprising per-
forated steel sheets between which the active material is compressed,
usually in the form of pockets or tubes. This method of construction
affords cells with a relatively long discharge period (see Fig. 7.28a and b).

Construction
Nickel-cadmium pocket plate

Plate tab

Plate frame serves
as current collector
Pockets

Final pocket plate assembly
Figure 7.28 (a) Construction of nickel-cadmium pocket plate.

Construction

Terminal seal Frame arresting
vents

Separating grids Plate group bus

Plate tab

Plate frame Plate

Figure 7.28 (b) Construction.

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