Will the lithium battery explode if it is punctured?

First of all, if it is not the negative electrode lithium (lithium ions are not completely combined with carbon and lithium crystals appear), the lithium ions are in a stable state and will not react due to lithium and air. Even if lithium is separated, it is not the main cause of combustion. The reason for spontaneous combustion is that after the battery is destroyed, 1. a metal weapon causes a short circuit of the battery; 2. an external force damages the diaphragm and causes a short circuit of the battery. When a DC short-circuit occurs, the heat is huge, causing the battery to run out of thermal control, and the temperature will rise to more than 300 degrees Celsius in milliseconds. The most important flammable substance in lithium batteries is actually electrolyte. In the absence of flame retardants (in fact, all products have flame retardants), the ignition point of the electrolyte is about 130 degrees Celsius. In the final analysis, the large-scale electric vehicle accidents that have occurred are caused by the destruction of the battery and the outflow and burning of electrolyte. However, it is also divided into technical systems. As we all know, lithium batteries are roughly divided into cobalt-lithium, manganese-lithium, ternary, iron-lithium, etc., among which the thermal runaway temperature of cobalt-lithium and ternary is lower than 300 degrees Celsius, manganese-lithium is about 400 degrees Celsius, iron-lithium The temperature is higher than 700 degrees Celsius. Recently, there are also iron-manganese-lithium binary products. Depending on the doping, the critical thermal runaway is 400-600 degrees Celsius. It can be seen that there is a big difference, which is one of the reasons why iron-lithium is safe. Therefore, in the iron-lithium national standard, the metal acupuncture test is a must-do safety test. In other words, iron-lithium batteries that meet the requirements of our country should not burn or explode after acupuncture. This experiment has done a lot, and there is basically no objection, even I encountered some products that can be used continuously after acupuncture. The knife cut mentioned by the subject is even more destructive. I have tried (zuo) and tried (si) this experiment, and the battery did not burn or explode. In some third-party tests in recent years, the supervisory agency asked the unplaning battery to check whether there is an internal structure. The standard is whether there is only one battery in the unified electrolyte structure. We have also split the battery many times for explanation, but none of it has been found. Security Question. Therefore, iron-lithium battery products that meet national standards should not be spontaneously combusted after knife cutting due to their chemical characteristics and the protection after adding flame retardants. Other products cannot be guaranteed. Of course, since I work on iron-lithium here, I am not familiar with the standards of manganese-lithium and other products. I also hope that my colleagues will add answers to correct me. Theoretically speaking, the metal foreign body puncture experiment should be the foundation of the foundation. 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: Analysis of common faults and repair methods of 12v lithium batteries