Advantages of Li-polymer battery.
(1) Good safety performance. Polymer lithium battery in the structure of the aluminum-plastic flexible packaging, as opposed to the metal shell of the liquid cell, in the event of a safety hazard, lithium-ion cells are prone to explosion, while polymer cells will only gas drum, at most, burning.
(2) thickness of small can be made thinner ultra-thin, thickness can be achieved below 1mm, can be assembled into the credit card. Ordinary liquid lithium battery thickness to do below 3.6mm there is a technical bottleneck, and 18650 battery is a standard volume.
(3) Light weight, high capacity battery with polymer electrolyte does not need a metal case as a protective cover, so the capacity is the same, 40% lighter than steel-cased lithium batteries, 20% lighter than aluminum-cased batteries. When the volume is generally large, the capacity of polymer batteries is greater, about 30% higher.
(4) shape can be customized polymer batteries can be increased or reduced cell thickness according to actual demand, such as a famous brand of new notebooks is the use of trapezoidal polymer batteries, making full use of internal space.
Advantages of 18650 lithium battery.
1、Wide range of use
Widely used in all kinds of electronic equipment, such as laptop computers, walkie-talkies, portable DVDs, instruments, audio equipment, model aviation, toys, video cameras, digital cameras, etc.
2、Series connection
Can be combined in series or parallel to form 18650 lithium battery pack.
3、Low internal resistance
The internal resistance of polymer batteries is smaller than that of ordinary liquid batteries. The internal resistance of household polymer batteries can even be less than 35mΩ, which greatly reduces the self-consumption of the battery. This support for high discharge current lithium polymer battery is ideal for remote control models, which has become the most promising alternative to NiMH batteries.
4、No memory effect
No need to empty the remaining power before charging, easy to use.
5、High voltage
The voltage of 18650 Li-ion battery is usually 3.6V, 3.8V and 4.2V, much higher than the 1.2V of NiCd and NiMH batteries.
6、High safety performance
18650 lithium battery has high safety performance, non-explosive, non-combustible; non-toxic, non-polluting, RoHS trademark certification; cycle times greater than 500 times; good high temperature resistance, discharge efficiency of up to 100% at 65 degrees. To prevent the battery from short circuit, the positive and negative electrodes of 18650 lithium battery are separated.
Therefore, its possibility of short circuit has been minimized. Protection plates can be added to avoid overcharging and over discharging of the battery, which can also extend the battery life.
7、Long life span
18650 lithium battery has a long service life, the cycle life can reach more than 500 times in normal use, which is more than twice as long as ordinary batteries.
8、High capacity
The capacity of 18650 lithium battery is usually between 1200mah~3600mah. If 18650 lithium battery is combined together to form 18650 lithium battery pack, the 18650 lithium battery pack can easily break through 5000mah.
Second, 18650 lithium battery and polymer lithium battery difference.
1, raw materials are different lithium-ion battery raw materials for the electrolyte (liquid or colloid); lithium polymer battery raw materials for the electrolyte have polymer electrolyte (solid or gel) and organic electrolyte.
2, safety is different lithium-ion batteries in high temperature and high pressure environment is prone to explosion; lithium polymer batteries use aluminum-plastic film to do the shell, when the internal organic electrolyte, even if the liquid is very hot does not explode.
3, shaping different polymer batteries can be thin, any area and any shape, the reason is that its electrolyte can be solid or gel rather than liquid, lithium batteries use electrolyte, a strong shell is needed as a secondary packaging to accommodate the electrolyte.
4, the cell voltage is different because polymer batteries use polymer materials, can be made in the cell multi-layer combination to achieve high voltage, while the nominal capacity of lithium battery cells is 3.6V, to achieve high voltage in practice, it is necessary to connect multiple cells in series to form the ideal high-voltage platform.
5, manufacturing process is different polymer batteries the thinner the better production, lithium batteries the thicker the better production, which makes the lithium battery in the application can be expanded in more areas.
6, capacity polymer battery capacity is not effectively improved, compared with the standard capacity of lithium batteries and reduced.
7, 18650 battery life theory for cycle charging 1000 times. Because of the large capacity of the unit density, so most of them are used in laptop batteries, in addition, because of the 18650 in the work of the stability of performance is very good, widely used in major electronic fields: commonly used in high-grade flashlight, portable power, wireless data transmitter, etc.. Polymer batteries are mainly used in cell phones and mobile DVDs.
8, electrolyte materials are different: liquid lithium-ion batteries use liquid electrolyte, while polymer lithium-ion batteries use solid polymer electrolyte instead.
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