Page 66 - Handbook of Battery Materials

32 2 Practical Batteries

Electric
welding

Positive tab

Negative
electorde
Enlargement Separator
Positive electrode
Positive cap
Spring
Cover plate
Gasket Seal plate
Rubber plate
Positive tab

Separators

Positive
electrode

Casing
Negative
electrode

Negative tab

Figure 2.6 Structural design of a cylindrical Ni–Cd battery.

on the charge current and ambient temperature. Figure 2.9 shows the discharge
characteristics at various discharge rates. The discharge capacity of the cell decreases
as the discharge current increases. However, compared with other batteries,
nickel–cadmium batteries have excellent high-current discharge characteristics. A
continuous, high-current discharge at 4 C or, in some types, over 10 C is possible.
Figure 2.10 shows the charge–discharge cycle characteristics. As shown in this
figure, nickel–cadmium batteries exhibit excellent cycle characteristics and no
noticeable decline is observed after 1000 charge–discharge cycles.