With the increasingly fierce price war of smart phones, the penetration rate of smart devices is increasing. The ever-growing market will expand the demand for smart phone-related accessories, among which the most closely connected is the mobile power supply! However, due to the lack of standardization and maturity of the mobile power supply market, many small brands and manufacturers seize the market every year. With a large number of fake and shoddy products, consumers have poor product experience and even personal and property injuries. The editor will popularize some knowledge about mobile power supplies, and answer the questions about which mobile power batteries are often asked by you. I hope you can gain something.

    First, let’s take a look at the three main components of the mobile power supply, namely the battery cell, the circuit board, and the housing. Among them, the battery cell, as the core component, is composed of the positive electrode material, the negative electrode material, the electrolyte and the diaphragm, and it is an influential product. One of the biggest influencing factors of charging and use effect. If it is the same from the perspective of product cost, the battery core alone accounts for 60% of the cost of a power bank, and the remaining circuit boards and casings only account for 40%. The current power bank batteries are all lithium-ion batteries, which can be divided into liquid lithium-ion batteries and polymer lithium-ion batteries according to the electrolyte material. According to the main market classification can also be divided into: 18650 batteries, polymer batteries, lithium iron phosphate batteries.

    1. 18650 batteries

    The technical term is called lithium cobalt oxide battery, and the public prefers to call it 18650 battery, commonly known as the enlarged version of AA battery. It is a cylindrical battery with a diameter of 18 mm and a height of 65 mm, just like a large AA battery, which can be easily distinguished by its appearance. At present, the 18650 battery cell technology is relatively mature, its battery structure is stable, the specific capacity is high, the comprehensive performance is outstanding, and because of its small size, it can be used in many areas. However, its safety is inferior to polymer lithium batteries, and the number of cycles of the battery cell is low, only about 300 times.

    2. Polymer batteries The technical term becomes the nickel-cobalt-manganese battery cell, and the polymer lithium ion is replaced by the colloidal polymer, which is "solid" or "colloidal".

    3. Lithium iron phosphate battery This lithium iron phosphate battery is a new type of battery in recent years, and it can be said to be the product with the best safety performance for the time being. The number of charging cycles has also reached about 2000, and the safety is high, and there is no pollution, but this kind of battery has two fatal shortcomings for mobile power sources, that is, large size and high price, which are determined by these two factors. For the time being, the batteries of this kind of batteries are rarely used in mobile power sources. The batteries are now mainly used in electric vehicles, small energy storage batteries, lawn lights, power tools and other relatively large tools.