18650 cells and lithium polymer cells
18650 cell
Type 18650 lithium cell refers to a battery with a diameter of 18mm and a total length of 65 mm. 0 indicates a cylindrical battery. The skills of the 18650 cell are relatively mature. The battery structure is strong, the specific volume is high, and the comprehensive type is more bulging. At the same time, it is important because the exquisite body shape may be used in many areas. The disadvantage is that its safety is worse than that of polymer lithium batteries, and the number of reincarnations of cells is relatively low, roughly only about 300 times.
The 18650 cell is usually cylindrical and is usually designed with a steel shell. Importantly, the lithium ion display of 18650 is liquid, as if a cup is full of water, so the 18650 can only be cylindrical.
The risk factors of 18650 are still high. Importantly, the packaging design of 18650 usually uses steel shells. If the manufacturer fails in the case of production, it is very easy to cause trouble.
Polymer cells
The difference between polymer cells and traditional lithium-ion batteries lies in the production process. Lithium batteries are wrapped together and soft in size. Polymers are superimposed and hard in size. For similar polymers and lithium batteries, the volume of polymers is larger, about 30% higher. At the same time, it is safer and less dangerous. Long service life. Charges and discharges have reached more than 500 times. The disadvantage is that polymer cells with similar volume are at least more expensive than 18650 lithium-ion cells. The safety difficulty of lithium polymer cells is that liquid leakage and short circuit are likely to cause bulge difficulties, which will cause incineration and small flames.
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