Nickel-Cadmium Rechargeable Cells
Nickel-Cadmium electrochemical system was proposed in 1899 by V. Jungner that puts nickel-cadmium system at the second place after lead-acid from historical point of view. Invention of the sealed Ni-Cd batteries manufacturing technology followed by the sharp improving of battery operational characteristics resulted in wider expansion of their applications range.
The positive plate in Ni-Cd is nickel oxide, the negative one - cadmium. The electrodes are separated from each other by means of the separator. KOH solution is used as the electrolyte, the basic current-forming process is described by the following equation:
2 Ni (OH)2 +Cd (OH)2 2Ni OOH+Cd+H2O
At the end of charge the side reaction of oxygen evolution takes place on the positive electrode:
4 OH- O2 + 2 H2O +4e
The oxygen evolved on the positive plate is ionized on the negative one.
Fields of application:
- Communication means of various purpose
- Radio equipment
- Devices of night viewing
- Space and rocket equipment
The rechargeable cell represents the cylindrical case made of steel inside of which the curled positive and negative plates are. The plates are divided by separator. The outer side surface of the cell is painted or coated with insulating film. The lid is the terminal of positive electrode, the case or bottom – of negative one.
The batteries having any nominal voltage according to the customer’s need can be made on the base of nickel-cadmium sealed rechargeable cells of cylindrical type.
In NIAI «Istochnik» the continuous works in the field of improvement of quality and technical characteristics of cylindrical cells and batteries on their base are carried out.
Nickel-cadmium rechargeable cells of prismatic type are produced in various configurations. Configuration of «ÍÊÃ» type consists of positive and negative plates of metal-ceramic design. Configuration of «ÍÊÃÊ» type — of metal-ceramic positive and negative plates without metal-ceramic base. Electrode blocks are placed into the metal and plastic casings.