Nickel cadmium batteries refer to alkaline nickel cadmium batteries that use metal cadmium as the negative electrode active substance and nickel hydroxide as the positive electrode active substance. The positive and negative electrode materials are respectively filled in perforated nickel steel strips (or nickel strips), and the plates are made by methods such as slurry drawing, rolling, sintering, forming or coating, drying, and pressing; Use materials such as polyamide non-woven fabric as isolation layers; Using potassium hydroxide aqueous solution as electrolyte solution; Electrodes are assembled by winding or stacking inside plastic or nickel plated steel shells

　　Nickel cadmium batteries have a nominal voltage of 1.2V and come in various types such as cylindrical sealed (KR), button sealed (KB), and square sealed (KC). It has the characteristics of wide temperature range, long cycle and storage life, and the ability to discharge at high currents, but there is a "memory" effect, which often leads to a decrease in electrical performance due to regular incorrect use

　　Application of nickel cadmium batteries: Large bag and open type nickel cadmium batteries are mainly used as starting or emergency power sources for railway locomotives, mines, armored vehicles, aircraft engines, etc.

　　Cylindrical sealed nickel cadmium batteries are mainly used in portable appliances such as electric tools and shavers. Small buckle type nickel cadmium batteries are mainly used for cordless phones, electric toys, etc. with low current and low rate discharge. Due to the environmental pollution caused by discarded nickel cadmium batteries, this series of batteries will gradually be replaced by better performing nickel metal hydride batteries.

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