Types, advantages, and disadvantages of 18650 lithium batteries

What kind of battery is the 18650 lithium-ion battery?

18650 battery is a general term class of batteries, most of which now refer to 18650 lithium-ion batteries, where 18650 refers to the external dimensions of the battery, 18 represents a diameter of 18mm, 65 represents a length of 65mm, and 0 represents a cylindrical battery.

1. What type of 18650 battery is there?

There are 18,650 NiMH batteries, 18,650 Li-Ion batteries and 18,650 LiFePO4 batteries.
Due to the material properties of 18650 NiMH batteries, their energy density is not as good as that of Li-ion batteries. That is, under the same volume, the capacity density of lithium-ion batteries is higher than that of nickel-metal hydride batteries. As a result, the 18650 NiMH battery disappeared from the market. However, 18650 lithium-ion batteries are also divided into lithium-ion batteries and lithium iron phosphate batteries. The rated voltage of the lithium-ion battery is 3.7v, the charge cutoff voltage is 4.2v, the rated voltage of the lithium iron phosphate battery is 3.2v, the discharge cutoff voltage is 3.6v, and the general capacity is 1200mAh-3350mAh, and the general capacity is 2200mAh-2600mAh.

Second, the advantages and disadvantages of each category 18650

(1)18650 Li-ion battery

The 18650 lithium-ion battery is a liquid lithium-ion battery, and its electrolyte is liquid.

1. The advantages of the 18650 lithium-ion battery
(1) The capacity of the large-capacity 18650 lithium-ion battery is generally between 1200mah and 3600mah, while the general battery capacity is only about 800mah. If it is combined into a 18650 lithium-ion battery pack, the 18650 lithium-ion battery pack can easily exceed 5000mah.

(2) Long-life 18650 lithium-ion battery has a long service life. Under normal use, its cycle life can reach more than 500 times that of ordinary batteries, which is more than twice that of ordinary batteries.

(3) High safety performance 18650 lithium-ion battery, with high safety performance, no explosion, no burning; non-toxic, non-polluting, RoHS trademark certification; various safety performance, more than 500 cycles; high-temperature resistance, 65 degrees power efficiency up to 100%. To prevent short circuits, the positive and negative electrodes of the 18650 lithium-ion battery are separated. Therefore, the possibility of its short circuit has been reduced to the limit. You can add a protective panel to prevent the battery from being overcharged, which can extend the life of the battery.

(4) The voltage of a 18650 lithium-ion battery is generally 3.6v, 3.8v, or 4.2v, which is much higher than the 1.2v voltage of nickel-cadmium battery and nickel-hydrogen battery.

(5) No memory effect, no need to empty the remaining power before charging, easy to use.

(6) The internal resistance is small, the resistance of the polymer battery is smaller than that of the liquid battery, and the internal resistance of the domestic polymer battery can even be less than 35m, which greatly reduces the battery power consumption and prolongs the standby time of the mobile phone, which can reach the international level. This polymer lithium-ion battery supports a large discharge current and is ideal for remote control models and is the most promising alternative to nickel-metal hydride batteries.

(7) 18650 lithium-ion batteries can be synthesized in series or in parallel

(8) Extensive use of laptop computers, walkie-talkies, portable DVDs, instruments, audio equipment, model aircraft, toys, video cameras, digital cameras, and other electronic equipment.

2. Disadvantages of 18650 lithium-ion battery

(1) The biggest disadvantage of the 18650 lithium-ion battery is that its volume is fixed, and it is not easy to locate when installed in some notebook computers or some products. Of course, this disadvantage can also be said to be an advantage, related to the customizable and variable size disadvantage of other Li-polymer batteries and other Li-ion batteries. This is an advantage that some products specify battery size.

(2) 18650 lithium-ion batteries are prone to short circuits or explosions, which is also related to lithium polymer batteries. If the battery is relatively ordinary, this defect is not so obvious.

(3) When producing 18650 lithium-ion batteries, there must be a protective line to prevent the battery from being discharged due to overcharging. Of course, this is necessary for lithium-ion batteries, which is also a common disadvantage of lithium-ion batteries, because lithium-ion batteries are made of lithium cobalt acid material, and lithium cobalt acid material cannot discharge large currents, which is safe Bad sex.

(4) The production conditions of 18650 lithium-ion batteries are demanding. Compared with ordinary battery production, 18650 lithium-ion batteries require higher production conditions, which undoubtedly increases production costs.