What are the reasons for the explosion history of 18650 lithium batteries?

Most of the 18650 batteries are packaged in steel shells. Since the quality of the batteries is not good, the internal pressure will increase sharply under the condition of overcharge (overcharge). When it exceeds the withstand value, it will explode. Problems such as short circuit, high temperature, or squeezed deformation or even puncture of the battery may cause the battery to explode. After 30 years of development, the 18650 battery preparation process has been very mature, in addition to greatly improved performance, its safety is also very complete. In order to guard against the explosion of the sealed metal casing, the current 18650 battery will be equipped with a safety valve on the top. The safety valve is the standard configuration of every 18650 battery, and it is also the most important explosion-proof barrier. When the internal pressure of the battery is too high, the safety valve on the top of the battery will open the exhaust and reduce pressure, and be wary of explosion. However, when the safety valve is opened, the chemical substances leaking from the battery will react chemically with oxygen in the air under high temperature conditions, and a fire may still occur. In addition, some of the current 18650 batteries also come with a protection board, which has functions such as overcharge, overdischarge and short circuit protection, and has a very high safety performance. The previous mobile power explosion incidents were all caused by unscrupulous manufacturers using unqualified 18650 batteries to save costs, or even second-hand waste electricity. At present, the 18650 batteries processed by major battery manufacturers such as Panasonic, Sony, Samsung, etc. are actually very safe, and the usage rate of 18650 batteries is very high. We can use them correctly in daily use and beware of short-circuit, damaged or damaged batteries. If the temperature is too high, there is no need to worry about the battery exploding. We cannot overturn a boatman with one bamboo pole, and use individual inferior products to determine the safety of 18650. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Lithium battery protection board working principle and functional use analysis