Let’s first look at the difference between polymer and 18650:
Currently, electronic gift item on the market generally have two kinds of batteries, one is 18650 batteries, and the other is polymer batteries. These two batteries dominate the market for the vast majority of the lithium battery industry. In many netizens mentioned lithium battery cells, here we explain the two common batteries.
18650 is the industry’s statement, that is, the battery has a diameter of 18mm and a length of 65mm. The cylindrical battery mainly produced by Sanyo, Panasonic, Samsung, and Sony. There are also some manufacturers in China that produce 18650, but the reputation and The impact is not as big as the three above. And Panasonic has actually become the world’s largest production plant for the 18650 due to the acquisition of Sanyo.
18650 capacity regular size:
Generally there are 2200mAh, 2400mAh, 2600mAh, 2800mAh capacity standard. According to industry insiders, the current 18650 has achieved a maximum single-block capacity of 3400mAh. If the lithium battery in the electronic product uses 18650 as the battery core, it basically connected in parallel with the above specifications.
The 18650 generally packaged in steel, that is, 18650 lithium ions are in a liquid state, just like a cup filled with water, similar to this understanding. Therefore, the 18650 can only be cylindrical. If you buy electronic products, you can see that the parts of the battery are thick and large, basically 18650 batteries.
Due to the particularity of the 18650 package (with steel shell), if the quality of the products produced is not good, the biggest danger is the explosion. The explosion caused by notebooks in previous years is because of the laptop batteries produced by Sony (usually using 18650) There is a problem with quality control.
Lithium polymer battery:
The raw materials generally prepared by mixing lithium cobaltate, lithium manganate, and ternary lithium. Through a certain proportion of the three mixtures, a certain process used to make the outer packaging mainly using aluminum plastic film, and the lithium material in the middle is paste. So the shape can be customized. At the same time, you can make ultra-thin batteries, such as ultra-thin batteries such as 0.33mm and 0.50mm.
Lithium polymer battery capacity:
Since the polymer battery can be of any size, it has no standard shape. The general volume marked as long * wide * thick. In addition, the battery has a positive and negative tolerance. And a positive and negative tolerance of 0.5 mm for the length and width. While a negative tolerance of 0.55 mm for the thickness. The polymer determined by the size of the volume, and also related to the ratio of the lithium raw material.