What is the difference between nickel metal hydride batteries and lithium batteries?

Introduction What is the difference between nickel metal hydride batteries and lithium batteries? Nickel-metal hydride batteries are good. The differences between nickel-metal hydride batteries and lithium batteries are as follows: 1. The cell voltages are different.

What is the difference between nickel metal hydride batteries and lithium batteries?

Ni-MH batteries are good. The differences between nickel-hydrogen batteries and lithium batteries are as follows:

1. The cell voltages are different. The voltage of lithium-ion batteries is 3.7-4.2V, and the voltage of nickel-metal hydride batteries is only 1.2V. The capacity of one lithium-ion battery is equivalent to three batteries nickel-metal hydride connected in series.

2. The loading speed is different. Due to the active performance of lithium ions, they move faster inside the battery, so the charging current is larger and the charging speed is faster. A lithium-ion battery can be fully charged in about 3 hours, while the charging speed of nickel is high. metal hydride batteries are very slow and it takes about 1 day.

3. The energy density is different. Lithium-ion batteries have ahigh energy density. In the first batch of promotional catalogs in 2019, the energy density of electric vehicle batteries reached more than 160 Wh/kg; nickel-metal hydride batteries have a low energy density, only 40 to 70 Wh/kg; kg. Therefore, at equal volume, lithium-ion batteries have a greater capacity than nickel-metal hydride batteries.

4. Memory effects are different. Lithium-ion batteries have no memory effect and can be charged at any time; nickel-metal hydride batteries have a certain memory effect. It is best to fully discharge and charge them during daily use to avoid affecting the battery capacity.

5. The self-discharge phenomenon is different. Although the self-discharge capacity of nickel-metal hydride batteries is not large compared with nickel-cadmium batteries, compared to the self-discharge prenegligible squeegee of lithium batteries, nickel-metal hydride batteries are simply the king of discharge.

6. The prices are different. Lithium batteries are expensive and NiMH batteries are cheap. However, the price of lithium-ion batteries has fallen rapidly over the past two years.

No

The charging methods for lithium batteries and nickel-metal hydride batteries are different.

First of all, the single-cell voltages of lithium batteries and nickel-metal hydride batteries are different. For lithium batteries made from ternary materials, their nominal voltage is 3.6V and their actual voltage range is 2.8. -4.2V, while the nominal voltage of nickel-metal hydride batteries is generally 1.5V, and the actual voltage range does not fluctuate much.

In addition, the method of charging lithium batteries is differentte from that of nickel-metal hydride batteries. Lithium batteries usually start with a constant current, then a constant voltage, and finally stop, while nickel-metal hydride does not. this process.

If lithium batteries and nickel metal hydride are to be made into battery packs with the same voltage, their combination methods will be different and the actual voltages will also be different.

In summary, the chargers of these two batteries cannot be used universally

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