Briefly describe the excellent characteristics of nickel-metal hydride batteries

Nickel-metal hydride batteries are known as the most environmentally friendly batteries because of the low levels of environmental pollution. Compared with lithium batteries, nickel-metal hydride batteries have higher memory effects and higher self-discharge rates. However, nickel-metal hydride batteries have higher output currents than alkaline batteries and are more suitable for high-power products. At present, the capacity of nickel-hydrogen batteries is much higher than that of alkaline batteries. For example, AA batteries have a nominal capacity of 2700mAh, while alkaline batteries have only 2100mAh, which is certainly much higher than 1100mAh of nickel-cadmium batteries. But still can't match the lithium-ion battery. When the nickel-hydrogen battery is designed, the capacity is actually limited by the positive electrode, and the negative electrode capacity is designed to be excessive, so as to ensure that the oxygen generated by the positive electrode can react to the negative electrode during overcharge, and the internal pressure of the battery does not increase significantly.

The nickel-metal hydride battery for civilian use belongs to a low-voltage nickel-hydrogen battery, in which Ni(OH)2 is used as a positive electrode, a hydrogen storage alloy is used as a negative electrode, and an alkaline aqueous solution of potassium hydroxide is used as an electrolyte. Nickel-metal hydride batteries have the same specifications and nickel-cadmium batteries, and their performance indexes are similar. However, nickel-metal hydride batteries have their own unique advantages. The most important manifestation is that nickel-hydrogen batteries have higher specific energy density (that is, the same volume). The battery, the nickel-hydrogen battery has a larger capacity than the nickel-cadmium battery. In theory, the nickel-hydrogen battery is 1.5-2 times the energy density of the nickel-cadmium battery; the nickel-hydrogen battery has good environmental protection, and the nickel-hydrogen battery does not use metal. Cadmium does not use toxic substances and does not pollute the environment; nickel-hydrogen batteries basically eliminate the "memory effect."

As the number of nickel-metal hydride batteries in your hands continues to increase, the use and maintenance of science has gradually leapt into the attention of everyone. As we all know, the service life of brand NiMH batteries can be charged 500-1000 times according to the official claim. In fact, this is only an ideal value, and often it does not reach such a life. But as long as the charger is used reasonably and the Ni-MH battery is more deeply understood, we can still let her do “longevity”.

More and more manufacturers at home and abroad continue to introduce new products using nickel-hydrogen batteries. This phenomenon has accelerated the consumer buying boom. Of course, this battery also has many excellent performances, such as high energy density, high charging times, memory effect is small, do not contain harmful metals such as cadmium, make the position of nickel-hydrogen battery in the battery industry market more and more irreplaceable. In addition, the performance of nickel-metal hydride batteries in the power market is also good.

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