18650 lithium battery knowledge analysis
More than three hundred years ago, Benjamin Franklin began to capture lightning, which opened up people's awareness of lightning and opened up people's understanding of electricity. From that time on, many people were thinking about how to store the captured electricity, so Gradually, this kind of battery has been produced. Indeed, as a very important invention in history, the emergence of batteries has indeed solved many problems, greatly improving various living efficiencies, and the emergence of lithium batteries has made people more The understanding of electricity is getting deeper and deeper. The 18650 lithium battery is the lithium battery with the longest use time and still exists. It can see the shadow of 18650 lithium battery in many local areas, because this battery is compared with other batteries. Battery, the advantages are very obvious, and the security is relatively good, even has been used in large equipment, this article will introduce you to the knowledge of 18650 battery, and explain why there will be an explosion.
18650 lithium battery
First, the advantages of 18650 lithium battery
It is generally considered that the lithium battery's no-load voltage is below 3.0V and it is considered that the power is used up (the specific value needs to look at the threshold of the battery protection board, such as low to 2.8V, also 3.2V). Most lithium battery discharges can not put the no-load voltage below 3.2V, otherwise excessive discharge will damage the battery (usually the lithium battery on the market is basically used with a protective plate, so over-discharge will also cause the protection board to detect To the battery, it is impossible to charge the battery).
4.2V is the highest limit voltage for battery charging. It is generally considered that charging the lithium battery's no-load voltage to 4.2V is considered to be full. During battery charging, the battery voltage gradually rises to 4.2V at 3.7V, and the lithium battery cannot be charged. Charge the no-load voltage to 4.2V or higher, otherwise it will damage the battery. This is the special place for lithium batteries. Generally speaking, the 18650 lithium battery has the following advantages.
1, a wide range of uses
Electronic devices such as laptops, walkie-talkies, portable DVDs, instrumentation, audio equipment, model airplanes, toys, video cameras, digital cameras, etc.
It can be combined in series or in parallel to form a 18650 lithium battery pack.
3, the internal resistance is small
The internal resistance of the polymer battery core is smaller than that of the general liquid battery. The internal resistance of the domestic polymer battery can even be less than 35mΩ, which greatly reduces the self-consumption of the battery and prolongs the standby time of the mobile phone. The level of international integration. This polymer lithium battery that supports large discharge currents is an ideal choice for remote control models and is the most promising alternative to nickel-metal hydride batteries.
4, no memory effect
It is not necessary to empty the remaining power before charging, which is convenient to use.
5, high voltage
The voltage of the 18650 lithium battery is generally 3.6V, 3.8V and 4.2V, which is much higher than the 1.2V voltage of nickel-cadmium and nickel-hydrogen batteries.
6, high security performance
18650 lithium battery has high safety performance, no explosion, no burning; non-toxic, non-polluting, RoHS-certified; all kinds of safety performance in one go, the number of cycles is more than 500 times; high temperature resistance is good, discharge efficiency is up to 100% under 65 degrees . In order to prevent battery short circuit, the positive and negative poles of the 18650 lithium battery are separated. So the possibility of its short circuit has been reduced to the extreme. A protective plate can be added to prevent the battery from overcharging and over-discharging, which also extends the battery life.
7, long service life
The 18650 lithium battery has a long service life, and the cycle life can reach more than 500 times in normal use, which is more than twice that of ordinary batteries.
8, large capacity
The capacity of 18650 lithium battery is generally between 1200mah and 3600mah, and the general battery capacity is only about 800. If you combine 18650 lithium battery to 18650 lithium battery pack, then the 18650 lithium battery pack can break through 5000mah casually.