18650 lithium battery cells

　　A brief description of the disadvantages of 18650 lithium-ion battery technology

　　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 deficiencies

　　As the most mature type of liquid lithium-ion battery in the world, 18650 cylindrical lithium-ion batteries are widely used in mobile terminal equipment, especially tablet computers and smartphones, 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, it is all caused by the short circuit of the 18650 lithium-ion battery (group): if it is used improperly or because of the battery cell design itself The problem is that the internal pressure of the lithium-ion 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-ion batteries as energy storage units. There are two technical routes for this lithium-ion battery. One is liquid lithium-ion battery cells. Because the 18650 model technology is the most mature, 18650 lithium-ion batteries are used as the core. represent. The so-called 18650 lithium-ion battery refers to its specification model with a diameter of 18mm and a height of 65mm; the other is a polymer lithium-ion battery, which is generally designed as a square lithium-ion battery. Polymer lithium-ion 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, because polymer lithium-ion batteries are made of different materials than liquid lithium-ion batteries, the factory cost is relatively high.