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In-depth analysis of mobile power batteries-18650 batteries are more likely to explode?

by:dcfpower     2021-03-09
1. The power cell publicity fools youu003cpu003e  Many mobile power manufacturers often emphasize that their cells are high-quality polymer cells when they promote their products, and their safety performance is better than other brands of cells, and give a lot of shocking 'Battery core explosion' photo, then how should consumers who care about product safety choose?u003c/pu003eu003cpu003eu003c/pu003eu003cpu003e   Because they don’t have relevant professional knowledge, consumers are more likely to buy mobile power Affected by the manufacturer’s publicity. The author will analyze the common mobile power batteries for you here, and reveal the false propaganda behind the batteries, and help you choose the mobile power products that suit you.u003c/pu003eu003cpu003e  Lithium ion battery is used as the battery core. Lithium ion battery is a kind of rechargeable battery, which mainly relies on the movement of lithium ions between the positive and negative electrodes to work. Lithium ion batteries used in mobile power sources are mainly divided into two types: liquid lithium ion Batteries and polymer lithium-ion batteries, it is these two batteries that merchants are making a big fuss about.u003c/pu003eu003cpu003eExplosion-proof batteries promoted by mobile power merchants (picture cut from Taobao)u003c/pu003eu003cp u003e  What are liquid lithium-ion batteries and polymer lithium-ion batteries? If there is a big difference in safety as claimed by the business, why is there still a big application? Next, I will analyze it for you.u003c/p u003eu003cpu003eSecond, liquid lithium ion battery (including 18650 battery)u003c/pu003eu003cpu003e  Liquid lithium ion battery (LIB) cathode material is a compound containing lithium, and the anode material is carbon (graphite), using liquid electrolysis Liquid is used as an electrolyte, and the battery does not contain pure lithium metal.u003c/pu003eu003cpu003e18650 batteries and soft-pack lithium-ion batteries are liquid lithium-ion batteriesu003c/pu003eu003cpu003e  The common ones in liquid lithium-ion batteries are Lithium cobaltate batteries, that is, the cathode material is LiCoO2, often appear in the form of 18650 batteries, that is, a cylindrical battery with a diameter of 18 mm and a length of 65 mm. The shell is usually a steel shell, and some manufacturers use a soft coating film. , Made into more diversified shapes.u003c/pu003eu003cpu003eInternal structure of 18650 batteryu003c/pu003eu003cpu003e  Take lithium cobalt oxide battery as an example, its energy density can reach approximately 140mAh/g, and its cycle life is greater than 300 (The most mature 18650 battery can provide more than 1,000 cycles). The current technology is relatively mature, the production process is simple, the product cost is lower, and it is widely used.u003c/pu003eu003cpu003eu003c/pu003eu003c pu003e18650 battery internal electrodes and diaphragmu003c/pu003eu003cpu003e   Most of the batteries in notebook computers use 18650 battery packs. Tesla electric cars also use 18650 batteries. More than half of the mobile power sources also choose 18650 batteries. As batteries. In addition, most digital products such as Bluetooth headsets and wireless devices use soft-packed lithium-ion batteries. The safety performance of such batteries is still guaranteed, but second-hand poor-quality batteries need to be avoided.u003c/pu003eu003cpu003eBuilt-in 18650 battery mobile poweru003c/pu003eu003cpu003e   is very The unsafe 18650 battery mentioned by many businesses is also a problem worth noting. The positive electrode of the genuine battery is equipped with a pressure relief valve, which can pop up and release the pressure in time when the pressure is high, reducing the occurrence of danger, and has high safety. 18650 battery accidents are mostly caused by the use of inferior second-hand batteries. The extremely wide application of the product is also the more common cause of its accidents, not because of the poor safety performance of the product. u003c/pu003eu003cpu003eThree, polymer lithium ion batteryu003c/pu003eu003cpu003e   polymer lithium ion battery (LIP, also known as lithium ion polymer battery, lithium polymer battery) cathode material is a compound containing lithium, the anode The material is carbon (graphite), solid or colloidal polymer electrolyte is used, and the battery does not contain pure lithium metal. u003c/pu003eu003cpu003ePolymer lithium ion battery (picture from Wikipedia)u003c/pu003eu003cpu003ePolymer lithium ion battery (picture from Wikipedia)u003c/pu003eu003cpu003e   polymer lithium ion battery The most common is the nickel-cobalt-manganese battery, that is, the cathode material is LiNiCoMnO2, which usually appears in a flat appearance. Taking nickel-cobalt-manganese battery as an example, its energy density can reach 160mAh/g, and its cycle life is more than 500 times. Due to the high production process requirements and higher cost, it is also a main reason for limiting its development. u003c/pu003eu003cpu003ePolymer lithium battery pack with ultra-thin design (picture from Wikipedia)u003c/pu003eu003cpu003e  Because the shape of lithium-polymer battery is more diverse, there are some electrical appliances with limited volume and shape. Better application. u003c/pu003eu003cpu003e   Lithium polymer batteries are mainly used in higher-priced electronic products, including some highly designed digital products, as well as some new model aircraft products. Lithium polymer batteries are also used in electric vehicles and electric bicycles. . u003c/pu003eu003cpu003eBulky polymer batteries (picture from Wikipedia)u003c/pu003eu003cpu003e   Polymer lithium-ion batteries are basically packaged with soft aluminum-plastic film, which will deform and reduce when the internal pressure is high Low pressure also has good safety performance, but this does not mean that lithium polymer batteries are absolutely safe. Such batteries still have the risk of rupture, fire and explosion during use. Users should also avoid harsh environments when using them. u003c/pu003eu003cpu003e4. Safety comparison of battery cell performanceu003c/pu003eu003cpu003e   After the above introduction, it is easy to find that the positive electrode material and negative electrode material of liquid lithium ion battery and polymer lithium ion battery are not substantially different. The working principle of the battery is also the same, but the properties of the electrolyte are different. u003c/pu003eu003cpu003eLiquid lithium ion batteryu003c/pu003e
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