Many people think that NiMH batteries will gradually be eliminated because lithium batteries may perform better, but from the perspective of environmental protection, NiMH may be better than lithium batteries, which is one of the reasons why Toyota always insists on using NiMH batteries. In addition, NiMH batteries are also very safe, because they use liquid water as the electrolyte, so NiMH batteries will not catch fire and explode even under very extreme conditions.
Advantages of NiMH batteries.
1, wide range of applications: 1.2V discharge platform can present a variety of combinations of forms, and is used in a large number of applications: electric power meters, mechanical automation, engineering measurement instruments, aircraft models, remote control vehicles, remote control boats, emergency lighting, solar lawn lights, remote control equipment, and digital microphones
2, long service life: the number of uses of high performance NiMH batteries is almost equal to that of lithium batteries. The tolerance to overcharge and overdischarge is better than that of lithium battery.
3, sealed type, less maintenance.
4, acceptable self-discharge rate, although compared with lithium batteries, NiMH battery self-discharge is still very large, but some high-performance NiMH battery self-discharge rate is even better than lithium batteries, some NiMH batteries can be stored at room temperature for up to 10 years or so can continue to use.
Some NiMH batteries can be stored at room temperature for up to 10 years and still be used. Nowadays, conventional NiMH batteries on the market have a certain low self-discharge performance. Conventional NiMH batteries can be stored at room temperature for 1 year and still be used normally.
Disadvantages of NiMH batteries
1. Excessive weight, the energy density of NiMH battery is always lower than that of Li-ion battery due to the influence of materials, and the weight of NiMH battery with the same energy ratio will be larger.
2. The charging management is complicated, and there is a big difference in the consistency of single cell, which seriously affects the battery life of the group.
3. Any memory effect, although very weak, but a long time of use, the occasional discharge and then continue to charge can restore some capacity
4. Low energy density caused by the volume of large and high weight is a very problematic issue. The use of pure electric vehicles nickel-metal hydride battery which seems unrealistic.
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