Under what circumstances will polymer lithium batteries be incinerated or exploded?

When a short-circuit occurs in a polymer lithium battery, an ultra-high short-circuit current is formed inside the battery, and a large amount of heat is generated instantaneously. It is very likely that the heat will run out of control and cause burning and explosion. The collision and damage of the battery caused by the traffic accident of the new energy vehicle caused the lithium battery to be short-circuited and then burned. The calculation stated that battery charging, short circuit and bumping are the most important scenarios for spontaneous combustion of new energy cars. In the polymer lithium battery pack, even if a single battery is thermally out of control, the energy released by the small-capacity battery will not cause the entire battery pack to burn and burst. However, the structure of the battery pack formed by the small-capacity battery is complex, and the system integration efficiency is low. The small-capacity battery has to use positive and negative materials with higher energy density. The soft-pack lithium battery is severely overcharged. The chemical system of the lithium ion battery determines that when the battery is overcharged, the LiCoO2 inside the battery becomes Co3O4. Co3O4 is a strong oxidant and can react with the electrolyte to generate gas (O2 ). When the cell voltage reaches close to 5V, following the increase in the internal temperature of the cell and the use of gas pressure, most of the cells will burn or explode due to internal short circuits. The polymer lithium battery cell is heated by high temperature. When the cell is heated at high temperature, the electrolyte will vaporize and divide together. The internal pressure of the cell will increase. The isolation film inside the cell may melt and cause the internal short circuit of the cell to cause incineration. When the data is overflowing with electricity, at a certain temperature, it will have an autocatalytic reaction and appear to be incinerated. Treatment measures: At present, it is urgent to adopt methods such as polymer lithium battery maintenance board, PTC, special charger and fuse to maintain the battery. In the meantime, the maintenance board is the primary maintenance for the overcharge, overdischarge and overcurrent of the cell. The PTC performs secondary maintenance on the cell when the cell is overheated and the current is cut off when the cell is overheated. The charging current and voltage of the cell are limited, and the fuse is currently less used. Its important purpose is to completely cut off the connection between the cell and the external circuit when the cell voltage or current is abnormal, and then ensure that the cell will not be used again. To ensure that the batteries will not present severe safety incidents. The best way is of course to have a plan for lithium battery maintenance circuit boards. Although this will increase the production cost of lithium batteries, the safe use of lithium batteries is necessary, and all the products of formal lithium battery processing manufacturers are unavoidable of this plan. Disclaimer: Some pictures and content of articles published on this site are from the Internet, please contact to delete if there is any infringement. Previous: What are the general advantages and disadvantages of polymer lithium batteries?