At present, the most commercially available batteries in the market are polymer lithium batteries and 18650 lithium batteries. Many friends who don't make batteries don't know what's different between the two batteries. Let's talk about the differences between polymer lithium battery and 18650 lithium battery.
1. Battery shape is different
The most intuitive thing about the cell of polymer lithium battery and 18650 lithium battery is that they are different in appearance. The polymer lithium battery is square, the shell is aluminum-plastic film, and it is soft wrapped battery. The 18650 lithium battery is cylindrical, the shell is steel, and it is hard packed. At the same time, 18650 lithium battery has only one size, its diameter and height are fixed, and the maximum capacity is 3200mah or The polymer lithium battery is different. It can be made into batteries of various sizes and shapes, such as triangle, trapezoid, arc and so on. Of course, in addition to the sphere, it can better control the battery capacity.

2. Differences in electrolyte
The two kinds of batteries are also different in terms of electrolyte. Of course, even if the same kind of battery is used, the electrolyte may be different. The difference here is mainly the difference in morphology. There are three kinds of electrolyte forms used in polymer lithium battery, which are liquid, colloidal and solid. Different electrolytes have different advantages and disadvantages. The electrolyte of 18650 lithium battery is basically liquid.
3. Differences in production process
The manufacturing process of polymer lithium battery is lamination, which can change the size and shape of the battery manufacturing with low cost and high efficiency. It can produce the battery with appropriate shape according to the actual application requirements of the product, make full use of the commodity space, and make the product more in line with the application requirements of consumers. 18650 lithium battery production and manufacturing process is winding type, which is a fixed size and shape,
4. Differences in application areas
The application field of polymer lithium battery in commercial products is much deeper and wider than that of 18650 lithium battery. Basically, 18650 lithium battery can be used to replace 18650 lithium battery, especially in 3C product field. Under the requirements of miniaturization and high endurance of intelligent equipment, 18650 lithium battery can't be used, while polymer lithium battery can