One minute to teach you what a lithium-ion battery was in 1865!

It is understood that in order to save costs, Japan's SONY Corporation has set a standard lithium-ion battery model, in which 18 indicates a diameter of 18mm, 65 indicates a length of 65mm, and 0 indicates a cylindrical battery. 18650 pack builder It's the 18650, the ancestor of the lithium-ion battery. Our common 18650 batteries are divided into lithium-ion batteries and lithium iron phosphate batteries. Lithium ion battery nominal voltage 3.7v, charging cut-off voltage 4.2v, lithium iron phosphate battery nominal voltage 3.2V, charging cut-off voltage 3.6v, the capacity is usually 1200mAh-3350mAh, common capacity is 2200mAh-2600mAh.

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Next, let's talk about the advantages and disadvantages of 18650 lithium batteries

Advantages:

1, large capacity

The capacity of the 18650 lithium battery is generally between 1200 MAh-3600 mAh, battery manufacturing machine while the general battery capacity is only about 800mah. If the 18650 lithium battery pack is added, the 18650 lithium battery pack can easily exceed 5000mah.

2, long life

The 18650 lithium battery has a long service life, and its normal service life can reach more than 500 times, which is more than twice the life of ordinary lithium batteries.

3, high safety performance

18650 lithium battery has high safety performance, no explosion and no combustion; Non-toxic, non-polluting, RoHS trademark certification; The safety performance is completed in one go li ion battery construction, the number of cycles is more than 500 times; High temperature resistance, 65 degrees discharge efficiency reaches 100%. In order to prevent short circuit of the battery, the positive and negative electrodes of the 18650 lithium battery are separated. So the possibility of short circuit has been reduced to the extreme. You can install a protection plate to avoid overcharging and overdischarging the battery and extend the service life of the battery.

4, high voltage

The voltage of 18650 lithium batteries is generally 3.6V, 3.8V and 4.2V, which is much higher than the 1.2V voltage of nickel-cadmium and nickel-metal hydride power batteries.

5, no memory effect, easy to use

There is no memory effect and no need to empty the remaining battery before charging.

6, small internal resistance:

The internal resistance of polymer batteries is less than that of ordinary liquid batteries. The internal resistance of domestic polymer batteries can even be lower than 35mω, which greatly reduces the self-consumption of the battery, extends the standby time of the mobile phone, and can reach the level of international integration. Polymer lithium batteries that support large discharge currents are ideal for remote control models and are the most promising alternatives to NIMH batteries.

7, 18650 Lithium battery packs can be combined in series or parallel.

8, wide range of use

Can be widely used in a notebook using computer, walkie-talkie, portable DVD, instrument instrumentation, sound system equipment, model aircraft, toys, video cameras, digital cameras and other electronic technology equipment.

Cons:

1, Fixed volume

The biggest disadvantage of the 18650 lithium-ion battery is that its size is already fixed, and when it is installed on some laptops or certain products, it is not easy to locate. Of course, this disadvantage can also be said to be an advantage, which is a disadvantage compared to other customizable and variable size lithium-ion batteries, such as polymer lithium-ion batteries. This is an advantage for some products with specified battery specifications. The 18650 lithium-ion battery is more prone to short circuits and explosions than the polymer lithium-ion battery, which is less pronounced than the conventional battery.

2, must need to protect the line

　The production of the 18650 lithium battery requires protection of the circuit to prevent the battery from overcharging and causing discharge. Of course, this is necessary for lithium batteries, which is also a disadvantage of lithium batteries, because the materials used in lithium batteries are basically lithium cobalt acid materials, lithium batteries made of lithium cobalt acid materials can not be large current discharge, poor safety.

3, the production of strict requirements

The production conditions of 18650 lithium-ion batteries are very good. Compared with the general production of lithium-ion batteries, the production conditions of lithium-ion batteries in 18650 are very high, which undoubtedly increases the production cost.