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.
Which is better, a lead-acid battery or a lithium battery?
The electric car I bought uses a lithium battery. My boss told me it was basically a lithium battery. the one currently used, this one has a longer lifespan and charges faster. In fact, lead-acid batteries and lithium batteries each have their own advantages and disadvantages. The choice of battery depends on the application scenario and needs.
The advantages of lead-acid batteries are: low cost, mature technology, high safety and recyclability.
The disadvantages are: low energy density, high weight, slow charging speed and short lifespan.
Equipment such as golf carts and electric forklifts that require stable power supply for a long time can use it.
The advantages of lithium batteries are: high energy density, light weight, fast charging and long life.
The disadvantages are: high cost, relatively low safety and non-recyclability.
Drones, submarines, smartphones, tablets, laptops, digital cameras, etc. all use lithium batteries as the main power supply device.