Nickel Hydride Batteries

　　The principle technology of nickel-cadmium battery

　　Electronic enthusiasts provide you with the principle technology of nickel-cadmium batteries, the principle technology of nickel-cadmium batteries, nickel-cadmium batteries can be charged and discharged more than 500 times, economical and durable. Its internal resistance is small, the internal resistance is very small, it can be charged quickly, and it can provide a large current for the load, and the discharge

　　The principle technology of nickel-cadmium battery

　　Nickel-cadmium batteries can be charged and discharged more than 500 times, economical and durable. Its internal resistance is small, its internal resistance is very small, it can be charged quickly, and it can also provide a large current for the load, and the voltage changes little when it is discharged. It is a very ideal DC power supply battery. Compared with other types of batteries, nickel-cadmium batteries are more resistant to overcharging or over-discharging. The discharge voltage of nickel-cadmium batteries varies according to the discharge device. Each unit battery (Cell) is about 1.2V, and the unit of battery capacity is Ah (Ampere Hour), mAh (milliampere Hour). is the "end-of-discharge voltage", the end-of-discharge voltage of nickel-cadmium batteries is 1.0/cell (cell is each unit battery). The self-discharge rate is low, and the characteristics of the nickel-cadmium battery will not deteriorate even if it is placed for a long time, and the original characteristics can be completely restored after being fully charged. It can be used in the temperature range of -20°C + 60°C. Since the unit battery adopts a metal container, it is strong and durable; it adopts a completely sealed method, and there will be no leakage of the electrolyte, so there is no need to replenish the electrolyte.

　　The key to improving battery performance and extending battery life is to avoid memory effects and over-discharge. Nickel-cadmium batteries have a memory effect, that is, after the nickel-cadmium battery has been charged and discharged several times at low capacity. If you want to charge and discharge a larger capacity, the battery will not work properly, this situation is the memory effect (Memory effect). The memory effect makes the end-of-discharge voltage set higher on video recorders and cameras. As the operating voltage decreases, the battery capacity also decreases on the surface, but the decrease in discharge voltage may be temporarily caused by one or two complete discharges. Phenomenon. The memory effect prevents the performance of the battery from being fully utilized, and also brings great inconvenience to shooting. Therefore, you should pay attention to using a charger with charge and discharge performance during use, such as Sony's BC-1WDCE, to avoid the memory effect. Carrying out a discharge after charging can also achieve the purpose of preventing the memory effect.

　　Nickel-cadmium battery (nickel-cadmium battery) uses metal cadmium as the negative electrode active material, nickel hydroxide as the alkaline battery of the positive electrode active material. The positive and negative electrode materials are respectively filled in perforated nickel-attached steel strips (or nickel strips), and the plates are made by drawing, rolling, sintering, chemical formation or pasting, drying, and pressing; Woven cloth and other materials are used as the isolation layer; potassium hydroxide aqueous solution is used as the electrolyte solution; the electrodes are wound or laminated and assembled in a plastic or nickel-plated steel shell. The nominal voltage of nickel-cadmium batteries is 1.2V, and there are many types such as cylindrical sealed type (KR), button type (KB), and square sealed type (KC). It has the characteristics of wide operating temperature range, long cycle and storage life, and can be discharged with a large current, but it has a "memory" effect, and the electrical performance is often reduced due to regular incorrect use. The battery expression of the nickel-cadmium battery is: (-)Cd︱KOH(NaOH)︱NiOOH(+) The battery reaction is: when discharging: Cd+NiOOH+H2O→Ni(OH)2+Cd(OH)2 when charging: Ni(OH)2+Cd(OH)2→Cd+NiOOH+H2O nickel-cadmium (Ni-Cd) rechargeable batteries are widely used in modern life.

　　It is known that the electrolyte solution of a nickel-cadmium battery is KOH solution, and its charge and discharge are carried out according to the following formula: Cd+2NiOOH+2H2O=Cd(OH)2+2Ni(OH)2 (discharge from left to right, charge from right to left) Charge anode: 2Ni(OH)2-2e—+2OH-==2NiOOH+2H2O charge cathode: Cd(OH)2+2e-==Cd+2OH-discharge anode: 2NiOOH+2H2O+2e-==2Ni(OH )2+2OH- discharge cathode: Cd+2OH--2e==Cd(OH)2