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18650 lithium-ion battery is a common lithium-ion battery model. 18650 is the representative of size, that is, the circumference of the battery is 18mm and the length is 50mm. The 21700 lithium-ion battery is also a reason. In the application of lithium-ion batteries, the 18650 cylindrical lithium-ion battery is known for its applicability to devices such as flashlights and radios. Compared with the flexible lithium-ion battery, the 18650 has a higher exposure in daily life. Then, the popularity of the 18650 lithium-ion battery and the flexible lithium-ion battery is different, just suitable for different application conditions. In different application fields, what are the advantages and disadvantages of 18650 lithium-ion battery and flexible lithium-ion battery?

1、 Differences between 18650 lithium-ion battery and flexible lithium-ion battery

1) Structure and principle: Although the appearance and internal structure are different, the principles of the two batteries are basically the same. Both batteries have positive electrode, negative electrode and electrolyte. The positive electrode material is generally lithium cobaltate, lithium nickel-cobalt manganate (ternary material), lithium iron phosphate or lithium manganate, etc. The negative electrode material is generally graphite, and the electrolyte is lithium hexafluorophosphate solution.

2) Packaging method: 18650 lithium-ion battery is generally packaged in steel shell (18 indicates diameter of 18mm, 65 indicates length of 65mm, and 0 indicates cylindrical battery). The structure of internal electrode sheet and diaphragm is coiled. The outer packaging of lithium polymer soft pack battery uses aluminum-plastic film, and the internal electrode sheet and diaphragm are laminated (stacked layer by layer).

3) The form of electrolyte is different: the electrolyte inside the lithium polymer flexible battery is polymer, which is generally gel or solid, while the electrolyte inside the 18650 lithium ion battery is generally liquid.

2、 Application fields and their advantages and disadvantages.

1) 18650 lithium-ion battery: The 18650 lithium-ion battery has a high degree of automation in production, and the consistency and safety of the battery have reached a high level. In addition, the battery itself is small in size and light in weight, which makes it have unique advantages in the modularization and standardization of system development. However, individual capacity problems make the number of 18650 batteries in use particularly large, and the problems of battery consistency and heat dissipation are more complex

2) Soft pack lithium ion battery: The soft pack battery has high monomer capacity and strong shape plasticity (it can produce ultra-thin batteries of 0.33mm, 0.50mm and other models), but its disadvantages are poor consistency and mechanical strength. Based on the characteristics of lithium polymer flexible batteries, lithium polymer flexible batteries are increasingly used in mobile phones, laptops, mobile power supplies and other fields.

Finally, both 18650 lithium-ion batteries and soft pack lithium-ion batteries have their own suitable fields, and there is no absolute who is good and who is bad. With the permission of technical conditions, some possible problems can be avoided. So don't worry. When choosing, you can only choose more suitable products to maximize the convenience of lithium-ion battery to life.

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