Nickel-cadmium battery is a DC power supply battery, a nickel-cadmium battery can be repeatedly charged and discharged more than 500 times, economical and durable. Its internal resistance to the low-force, both resistance is very small, fast charge, but also provides a large current to the load, and the discharge voltage changes little, it is an ideal DC battery supply.
1. The nickel-cadmium battery Introduction
Nickel-cadmium batteries nickel-cadmium batteries (Ni-Cd, Nickel-Cadmium Batteries, Ni-Cd Rechargeable Battery) is first used in mobile phones, and other devices superfamily the battery type, it has excellent large current discharge characteristics, high resistance to over-charge and discharge capacity, simple maintenance, general discharge using the following reaction:
Cd + 2NiO (OH) + 2 = an opposite reaction 2 +
charging .
Nickel-cadmium batteries most fatal disadvantage that the charge-discharge process if not handled properly, there will be serious “memory effect”, so that the service life shortened. The so-called “memory effect” is the battery before charging, the battery power is not fully exhausted, over time will cause the battery capacity dropIs low, the charging and discharging process of the battery (discharge more obvious), a little small bubbles generated in the battery plates, over time these bubbles reduce the battery plates also indirectly affect the capacity of the battery. Of course, we can reduce the “memory effect” by mastering a reasonable charge and discharge method. In addition, cadmium is toxic, so nickel-cadmium batteries is not conducive to protecting the environment. Many disadvantages such that the nickel-cadmium battery has been substantially eliminated from the application range of digital device battery.
2. The nickel-cadmium battery Details
Nickel-cadmium batteries can be repeated more than 500 times of charge and discharge, economical and durable. Its internal resistance to the low-force, both resistance is very small, fast charge, but also provides a large current to the load, and the discharge voltage changes little, it is an ideal DC battery supply. Compared to other types of batteries, nickel-cadmium batteries can withstand overcharge or overdischarge. Nickel-cadmium battery discharge voltage of the discharge apparatus according to differ, each unit cell (the Cell) is approximately 1.2V, the battery capacity per unit of Ah (ampere hour), mAh (milliamp hours), said discharge end voltage limit as “discharge termination voltage”, nickel-cadmium battery discharge termination voltage of 1.0 / cell (cell for each unit cell). Self-discharge rate, in the case of nickel-cadmium batteries placed in a long, the characteristics are not deteriorated, can be fully charged after fully restore the original properties, it may be used in the temperature range of 30 ℃ –50 ℃. Since the metal cell container, durable; a fully sealed manner, electrolyte leakage phenomenon does not occur, it is not required to replenish the electrolyte.
Key improve battery performance and extend battery life is to avoid memoryEffect and over discharge. Nickel-cadmium batteries have a memory effect, i.e., nickel-cadmium batteries after charging and discharging times at low capacity, if a larger capacity to be charged and discharged, the battery will not work, this is the memory effect (Memoryeffect) . In particular, the higher the discharge termination voltage is set to the VCR, a video camera, as the lower operating voltage, the battery capacity also decreases as the surface, but the discharge voltage may be lowered to a second full discharge caused by temporary phenomenon. Memory effect so that the performance of the battery can not be fully realized, but also cause great inconvenience to the shooting. Thus, in use, it should be taken with the charger charge-discharge characteristics, such as Sony Corporation BC-1WDCE, to avoid memory effect. Use as a general charger BC-1WA, BC-1WB, the discharge may be performed after a charging time of about 10, it may be the purpose of preventing the memory effect.