The scale of use of lithium battery packs and the reason for the explosion of lithium batteries

The scale of use of lithium battery packs: In just a few years, the scale of use of lithium battery packs has expanded from our usual days to the industrial field. It is not only used in some digital products such as laptops, portable CDs, etc. Some of the electric bicycles we use in our daily trips have also begun to use lithium battery packs. In some shopping malls and field operations, the backup power supply is also a lithium battery pack, and part of the power source in the aircraft also uses a lithium battery pack. It can be seen that the scale of application of lithium battery packs is increasingly widespread. In recent years, with the development of new energy technology and the popularization of electronic products, new energy batteries represented by lithium battery packs have become things that people increasingly rely on in their daily lives. However, the recent Samsung note7, iPhone battery explosion accident, and the recent serial burning of the Crab Island bus have triggered people's worries about new energy technologies. If the safety issue cannot be handled properly, it will affect the arrival of the new energy era. Reasons for explosion of lithium battery: 1. External short circuit of lithium battery. External short circuit may be caused by improper operation or misuse. Due to the external short circuit, the battery discharge current is very large, which will cause the heating of the battery cell, and the high temperature will cause the internal heat of the battery cell. The diaphragm shrinks or breaks completely, causing an internal short circuit and exploding. 2. Internal short circuit. Due to the internal short circuit phenomenon, the battery core discharges with a large current, and a large amount of heat occurs, which burns the diaphragm and causes a greater short circuit phenomenon. In this way, the battery core will have a high temperature, causing the electrolyte to analyze into a gas, causing the internal If the pressure is too high, when the shell of the battery cell cannot withstand this pressure, the battery cell will explode. 3. When the overcharge core is overcharged, the excessive release of lithium in the positive electrode will change the structure of the positive electrode. If too much lithium is released, it is easy to be unable to insert into the negative electrode, and it is also easy to cause lithium deposition on the surface of the negative electrode. Moreover, when the voltage reaches 4.5V At the above, the electrolyte will analyze and process a large amount of gas. All of the above may cause an explosion. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: What are the specific processes and processes of lithium battery processing?