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What are the advantages of nickel-metal hydride batteries and lithium batteries?

by:dcfpower     2021-03-14

Lithium batteries are more suitable for mobile phones than NiMH batteries, but for digital cameras, because digital cameras require a lot of current, and the power consumption is much larger than that of mobile phones, they are more suitable for high current output. Some nickel-metal hydride batteries are slightly better.

Ni-MH battery

Ni-MH battery is a combination of hydrogen ions and metal nickel, and its power reserve is 30% more than that of nickel-cadmium batteries and compared with nickel-cadmium batteries. It is lighter, has a longer service life, and has no pollution to the environment and no memory effect. The disadvantage of nickel-metal hydride batteries is that the price is much more expensive than nickel-cadmium batteries, and the performance is worse than that of lithium batteries.

Advantages: low price, strong versatility, high current, environmental protection and stability (compared with lithium) Disadvantages: heavy weight, shorter battery life, intolerant of over-charge (compared with lithium) Ni-MH battery The design originated from nickel-cadmium batteries, but great progress has been made in improving the memory effect of nickel-cadmium batteries. The main change is the replacement of cadmium originally used in the negative electrode with a hydrogen storage alloy, so the nickel-hydrogen battery is said to be a typical representative of material innovation. The pollution caused by nickel-metal hydride batteries is much smaller than that of nickel-cadmium batteries containing cadmium. Therefore, nickel-cadmium batteries have been gradually replaced by nickel-metal hydride batteries.

Recently, digital cameras use more and more nickel-metal hydride batteries. Battery manufacturers are also optimistic about this market. They have introduced high-capacity nickel-metal hydride rechargeable batteries, which has made the technology of nickel-metal hydride batteries advance by leaps and bounds, and their capacity has also increased Large, the use time is comparable to that of the lithium battery, and even the charger is getting more and more sophisticated, and the charging time is greatly shortened.

is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses non-aqueous electrolyte solution.

Advantages: no memory effect, lighter weight

Disadvantages: high cost, low current, intolerant of over-saturation (compared with NiMH) lithium battery has a lithium battery (not Rechargeable) and secondary lithium battery (rechargeable), secondary lithium battery is divided into Li-ion lithium ion battery and Li-Polymer lithium polymer battery.

General digital cameras usually use secondary lithium batteries (rechargeable). Compared with Ni-MH batteries, the weight is lighter than Ni-H, but the volume energy density ratio is 48% higher. Because of this, the production and sales of lithium-ion secondary batteries are gradually surpassing Ni-MH.

This kind of battery has low self-discharge and no memory effect. The charge and discharge times can reach more than 600 times. Especially the Li-Polymer battery developed in recent years, in addition to its smaller size, It is not restricted by the cylindrical or square shape of the general battery, and the weight is lighter.

Lithium batteries are not resistant to overcharge, and there is a danger of explosion if they are not careful. Therefore, a built-in control IC is required to prevent overcharge. However, the cost is relatively increased. There is no uniformity, so there will be cases where batteries cannot be purchased after production is discontinued. However, in order to overcome this problem, many manufacturers can also reduce inventory and unify lithium batteries. For example, FUJIFILM NP-60 is the same as CASIONP-30. Specifications, will not change the model, chargers, batteries, etc. must be replaced accordingly.

There are also Taiwanese manufacturers that have also introduced a charger that supports a variety of batteries (EX. Smart LCD fast charging dock (global voltage + socket)). You only need to change the socket when changing the model.

Lithium batteries also have a more difficult problem, which is environmental protection. Because lithium batteries contain many toxic substances, all lithium batteries must be recycled and cannot be discarded anywhere.

One.Volume

Compared with ordinary nickel-cadmium/nickel-metal hydride batteries, rechargeable lithium batteries are smaller (relatively), lighter in weight, low self-discharge rate, and have no memory effect. Advantages, widely used in many new mobile devices. The batteries of mobile devices such as mobile phones, laptops, and PDAs that we usually use have gradually been replaced by lithium batteries.

The memory effect of Ni-MH batteries is not very obvious, one thing. When you need to use it urgently, you don’t have to recharge after lighting up. It is best to charge it after lighting up in normal use.

Two. Electricity

Lithium batteries have large energy and small batteries; the voltage of a single lithium battery pack is 3 times that of a nickel-hydrogen battery; there is no memory effect, and it can be charged as needed. But it can't be charged at one time, so too many charge and discharge times will affect the life of the battery. Lithium batteries are not suitable for long-term storage, as they will lose part of their capacity permanently. It is best to charge it 40%

and store it in the freezer of the refrigerator.

Three. Charging method

The charging requirements of lithium batteries are different from nickel-cadmium/nickel-metal hydride batteries. The single voltage of rechargeable lithium batteries is 3.6V (some battery blocks may In the case of a nominally saving lithium battery). The charging of lithium batteries generally adopts the voltage-limiting current-limiting method. If a friend wants to charge the lithium battery independently, it should be noted that its charging method is different from the constant current charging method used by the nickel-cadmium/nickel-metal hydride battery, and ordinary nickel cannot be used. Charger for cadmium/nickel metal hydride batteries.

Although nickel-metal hydride batteries and lithium batteries are different, they are both new energy batteries of the current era, and they have played an irreplaceable role in the progress of human life!


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