What is 18650 battery cell? Currently, there are two types of battery cells in the mobile power market, one is 18650 battery cell and the other is polymer battery cell. These two types of battery cells dominate the vast market share in the lithium battery industry. Many netizens have mentioned mobile power battery cells. Here, I will explain two common types of mobile power battery cells.
18650 battery cell 18650 is a standard lithium-ion battery model established by Sony Corporation in Japan to save costs. Among them, 18 represents a diameter of 18mm, 65 represents a length of 65mm, and 0 represents a cylindrical battery. Common 18650 batteries are divided into lithium-ion batteries and lithium iron phosphate batteries. Lithium polymer battery cells are made by mixing individual raw materials such as lithium cobalt oxide, lithium manganese oxide, and ternary lithium. By mixing a certain proportion of the three substances and using a certain manufacturing process, the outer packaging is mainly made of aluminum-plastic film, and the lithium substance next to it is a paste. So the appearance can be customized arbitrarily. At the same time, ultra-thin batteries such as 0.33mm and 0.50mm may be manufactured.
The capacity of lithium polymer battery cells is not standardized in appearance as polymer batteries can be of any size. Some individual body areas are marked as length, width, and thickness. In addition, the battery cells have a positive and negative tolerance, with a positive tolerance of 0.5mm for length and width and a negative tolerance for thickness 0.55mm (with both positive and negative tolerances). Therefore, it indicates that the capacity of polymers is determined by their volume and is also related to the ratio of lithium raw materials used. Lithium polymer battery cells are covered with a layer of aluminum-plastic film on the outside, and then wrapped with a layer of high-temperature adhesive tape. The safety feature of polymer invention is leakage, short circuit, causing swelling, and in severe cases, burning and flames.
Therefore, compared to 18650, polymer battery cells are better in terms of insurance. However, incineration can also bring safety hazards, so it is advocated that users who use mobile power sources should try not to place them on pillows or beds. At present, the mobile power supply market still has a relatively large shipment volume of 18650, and the vast majority of mobile power supplies use 18650.
At present, in the high-end mobile power supply market, the vast majority of them use polymer cells to make mobile power supplies. To a certain extent, it is advocated that users should buy mobile power supplies with polymer cells, especially those with large capacity, such as 8000mA or more. If there is a safety incident, it is not fun, and polymer cell mobile power supplies often produce small sparks, which are unlikely to occur.
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