Introduction to the knowledge of lithium ion battery explosion

1. What is a battery explosion? The national standard stipulates that any part of the solid matter in the battery is discharged instantaneously, and it is called an explosion when it is pushed to a distance of more than 25cm from the lithium-ion battery. The method of identification in the experiment is to cover the test battery with a circular mesh so that the battery is at the center of the circle, that is, 25 cm from either side of the mesh cover. If no solid part passes through the mesh cover in the experiment, it proves that the battery has not exploded. Here are specific instructions for the net: the net wire adopts a soft aluminum wire with a diameter of 0.25mm, and the density of the net is 6-7 pieces/cm. 2. How to prevent lithium ion battery from exploding? All lithium-ion battery explosions are caused by battery heating caused by short circuits. The causes of short circuits include overcharging, overdischarging, direct connection of positive and negative electrodes, and electrolyte leakage. Therefore, in the design of lithium-ion batteries, the following points can be started: 1. It is forbidden to overcharge the battery above 4.2V; 2. It is forbidden to overdischarge the battery below 2.75V; 3. Install an explosion-proof valve on the metal casing; 4. Prevent short circuit during the process. The good way is of course to have the design of the battery protection circuit board. Although this will increase the manufacturing cost of lithium-ion batteries, regarding the safe use of lithium-ion batteries, the products of regular lithium-ion battery manufacturers cannot avoid this design. 3. Will polymer lithium-ion batteries explode? Polymer lithium ion battery is a kind of lithium ion battery product made of flexible packaging and polymer electrolyte. It will not explode under normal use and storage, unless it is short-circuited by man-made strong damage. In order to reduce the occurrence of explosion accidents, polymer lithium-ion batteries are being used in more and more occasions. Although the replacement of other types of batteries by lithium-ion batteries is still in progress, among the types of lithium-ion batteries, polymer lithium-ion batteries have begun. Replace ordinary lithium-ion batteries in some areas. 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: How to deal with the bulge of mobile phone battery