18650 battery pack 3.7v

　　Analysis of the weakness of 18650 lithium battery technology

　　The combustion and explosion accidents of smart phones and tablets, including Apple products, caused people to be full of doubts about the mobile power products driven by the same power. Consumers are worried that mobile power may become the source of such unsafe factors. Another source, and 18650 lithium battery technology is one of its weaknesses.

　　The combustion and explosion accidents of smart phones and tablets, including Apple products, caused people to be full of doubts about the mobile power products driven by the same power. Consumers are worried that mobile power may become the source of such unsafe factors. Another source, and 18650 lithium battery technology is one of its weaknesses. As the most mature type of liquid lithium-ion battery in the world, 18650 cylindrical lithium batteries are widely used in mobile terminal equipment, especially tablet computers and smart phones, either in the form of a single cell or in the form of a battery pack; however, the structure of the 18650 battery The characteristics make it inevitable that there are certain defects. Judging from the reported explosion accidents of the above-mentioned equipment, they are all caused by the short circuit of the 18650 lithium battery (group): if it is used improperly or because of the battery design itself, The internal pressure of the lithium battery (pack) will be too large, and in the case of pressure leakage, it will cause pressure on the hard shell (steel shell or aluminum shell) of the battery, causing the shell to explode. The current mobile power products use lithium batteries as energy storage units. This "lithium battery" has two technical routes. One is liquid lithium-ion battery cells. Because the 18650 model technology is the most mature, it is represented by 18650 lithium batteries. . The so-called 18650 lithium battery refers to its specification model with a diameter of 18mm and a height of 65mm; the other is a polymer lithium battery, which is generally designed as a square lithium battery. Polymer lithium batteries are also used as power drives for many devices because they can be shaped arbitrarily. If they are used in mobile power supplies, consumers' demands for miniaturization and thinning of mobile power supplies can be realized. However, since polymer lithium batteries are made of different materials than liquid lithium-ion batteries, the ex-factory cost is relatively high. Many consumers seem to have an endless pursuit of high capacity and low price for mobile power. They don't know much about it: at the existing level of battery technology, the requirements of the two are contradictory. At present, several mobile power brands in the first line, such as Yubo, Pinsheng, Pineng, etc., in order to open up market channels, will adopt relatively cheap 18650 battery technology in the early stage without exception. As mentioned earlier, 18650 batteries are used in other mobile phones. Problems on the terminal cannot be completely avoided when applied to mobile power supplies. Consumers’ worries about commercially available mobile power supplies are not unfounded. During the working process of the power supply, hydrogen gas is generated when the electrolyte is electrolyzed, which releases heat higher than the normal level, which cannot be effectively prevented. This lays the groundwork for the internal short circuit of the battery, which leads to explosion and combustion. Therefore, in addition to choosing polymer lithium battery mobile power as much as possible, consumers should also choose products from regular manufacturers. Although the price is slightly higher, the safety is more guaranteed.