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the active material. This is a very popular battery for electric vehicle use because it has a high discharge voltage and is of high efficiency. Flexible pillar strap connectors are regular equipment on “Iron Clad” Exide batteries. These consist of alloy terminals cast around lead plated copper strips, which give greater conductivity and which are more flexible than the stiff pillar-strap connectors used with the Exide standard lead plate batteries. The jar is the same as used for the Exide cells of similar size. A special type of vent is provided, which insures positive retention of the electrolyte yet permits the escape of gas evolved when the battery is charged. The top of the vehicle type cell with vent in place is shown at Fig. 17 E, while the method of sealing is clearly outlined at Fig. 17 D.
The Edison Alkaline Storage Battery. This is the only battery built of steel. It is the only storage battery having an alkaline solution and using active materials of nickel hydrate (positive) and iron oxide (negative). This construction and principle are said to have important advantages, and some of these are: It is light in weight. It occupies less space. Requires no spare parts. Its steel container is unbreakable. Requires very little attention. It suffers small loss of charge when idle. Does not need frequent hydrometer readings. Its tray assembly and cell connections are simple. It cannot suffer from sulphation or any kindred “disease.” Its exclusive use eliminates the need of a battery house. It is not subject to buckling or growing of plates. It may be discharged to zero, or as low as may be desired, without fear of injury. It requires no internal cleaning, the active materials being held securely in perforated steel tubes and pockets. It may be left unused, either charged or discharged, for an indefinite time, without any attention, and suffer no injury. Its cells are hermetically sealed, except for the single filler opening, indicating conclusively that no plate renewals, separator renewals or other repairs are needed or expected. It can be put on charge at any time, regardless of how much or how little of the previous charge has been used; and similarly it may be taken off charge at any time and used, whether fully charged or not.
The positive plates (Fig. 19) consist of a series of perforated steel tubes which are heavily nickel-plated and which are filled with alternate layers of nickel hydroxide and pure metallic nickel in
very thin plates. The tube is drawn from a perforated ribbon
of steel, nickel-plated, and has a spiral-lapped seam. After being filled with active material it is re-enforced with eight steel bands, which prevent the tube expanding away from and breaking contact with its contents. The negative plate consists of a grid of cold-rolled steel, also heavily nickel-plated, holding a number of rectangular pockets filled with powdered iron oxide. These pockets are also made up of finely perforated steel, nickel-plated. After the pockets are filled they are inserted in the grid and subjected
Fig. 17.—Constructional Features of the Exide "Iron Clad"
to considerable pressure between 'dies, which corrugate the surfaces of the pockets and force them into positive contact with the grids.
These elements are housed in a jar or container made from