Nickel-hydrogen battery and nickel-cadmium battery and […]
Nickel-hydrogen battery and nickel-cadmium battery and the difference:
Both nickel-metal hydride batteries and nickel-cadmium batteries have a working voltage of 1.2V. However, the specific energy of Ni-MH is higher than that of Ni-Cd batteries. According to different factors in the process of making the battery, the Ni-Cd battery has a strong memory effect, and the Ni-MH battery has a very small memory effect. However, due to the excellent high-rate discharge performance of nickel-cadmium batteries, in many power tools, nickel-hydrogen batteries cannot replace nickel-cadmium batteries. Therefore, in the ROSH standard, nickel-cadmium batteries are temporarily allowed to be used in the field of power tools.
The difference between lithium battery and Ni-MH battery:
Under the same size, lithium batteries have a larger capacity than nickel-hydrogen batteries, so their talk and standby time are longer than nickel-hydrogen batteries, and the price is higher than that of nickel-hydrogen batteries. In addition, under normal circumstances, Ni-MH batteries cannot be charged as they are used, and the convenience is greatly reduced.
The development of lithium-ion batteries is the first lithium battery, and then developed to the lithium-ion battery. Early lithium battery negative electrodes used pure lithium sheets. This kind of lithium battery can easily catch fire and cause danger. On this basis, lithium-ion batteries were developed. The negative electrode of lithium ion battery is graphite. The ion conducts lithium ions, not metallic lithium. Security is greatly improved.
The operating voltage of the lithium ion battery is 3.7V. The volume specific energy is higher than that of NiMH. Currently, lithium-ion batteries have aluminum shells, steel shells and flexible packaging. Occupy the market in their own different fields. Some markets are common, such as mobile phone lithium batteries.
The volumetric energy is higher than that of NiMH. Currently, lithium-ion batteries have aluminum shells, steel shells and flexible packaging. Occupy the market in their own different fields. Some markets are common, such as mobile phone lithium batteries.
However, since the working voltage of disposable batteries and nickel-metal hydride batteries was 1.2-1.5V before, and the two were connected in series as 2.4V-3V nickel-metal hydride batteries; mobile phones, etc. all use lithium batteries as mobile power sources.
Therefore, nickel-cadmium batteries and lithium-ion batteries cannot be replaced by other batteries in their respective fields.