How to effectively prevent lithium ion batteries from exploding?

Will lithium polymer batteries explode? How to prevent lithium ion batteries from exploding? Safety issues have always been an important issue that plagues the industrialization of lithium ion batteries. In recent years, all exposed battery explosion accidents are caused by the use of lithium-ion batteries without exception. We often see various safety accidents caused by lithium-ion batteries. lithium polymer battery. Will JPG lithium polymer batteries explode? Polymer lithium-ion batteries are lithium-ion battery products made of flexible packaging and polymer electrolytes. Under normal conditions of use, storage will not explode unless man-made short-circuit damage is caused. Lithium polymer battery is also called polymer battery. The biggest safety difference between lithium ion batteries and lithium ion batteries is that when the two batteries are heated to a certain level, the lithium ion battery will explode, while the lithium polymer battery will only show chemical volatilization, and will burn at most without exploding. Structure, polymer lithium-ion batteries usually use soft packaging, the shell is thin and soft, lithium-ion batteries use rigid packaging, more shells are thicker, harder, from a safety point of view, soft packaging batteries to prevent accidental damage, such as excessive charging voltage The explosion and damage caused by high temperature and high temperature are much smaller than that of rigid-packed lithium-ion batteries. In order to reduce the occurrence of explosion accidents, polymer lithium-ion batteries are used in more and more occasions. Although lithium-ion batteries are still in the process of replacing other types of batteries, polymer lithium-ion batteries have begun to replace ordinary lithium-ion batteries in some areas. How to prevent lithium ion batteries from exploding? Most lithium ion battery fires and explosions are caused by short circuits. This happens when the plastic separator fails and the anode and cathode are in direct contact. Once the two poles are connected, the battery starts to overheat. All lithium-ion battery explosions are caused by short circuits caused by battery heating. The causes of short circuits include overcharge, overdischarge, direct connection of positive and negative electrodes, and electrolyte leakage. Therefore, in the design of lithium-ion batteries, we can proceed from the following points: 1. It is forbidden to charge batteries above 4.2v; 2. It is forbidden to place the battery below 2.75v; 3. Install an explosion-proof valve on the metal casing; 4. Prevent short circuit during the process. Of course, the best way is to use lithium-ion batteries to protect the circuit board design. Although this will increase the manufacturing cost of lithium-ion batteries, it is necessary to use lithium-ion batteries safely. All regular lithium-ion battery manufacturers are products that cannot be prevented in this design. Lithium-ion battery explosions generally have the following situations: 1. The out-of-control protection of overcharge explosion or the out-of-control detection cabinet causes the charging voltage to be greater than 5v, which leads to the decomposition of the electrolyte, the violent reaction of the battery, the rapid rise of the internal pressure of the battery and the The explosion of the ion battery. 2. When the current explosion is out of control on the protection line or the detection cabinet, the charging current is too large to insert lithium ions. Lithium metal is formed on the surface of the pole piece, penetrates the film, and the anode and cathode are directly short-circuited and cause an explosion (rarely). 3. Ultrasonic welding of plastic enclosures explodes. When ultrasonic welding of plastic enclosures occurs, the ultrasonic energy is transferred to the battery due to equipment reasons. Ultrasound can melt the membrane in the lithium-ion battery well, and the positive and negative electrodes are directly short-circuited, causing an explosion. 4. Spot welding explosion When spot welding, excessive current will cause serious internal short circuit and explosion. In addition, during spot welding, the positive electrode connector is directly connected to the negative electrode, so that the positive electrode is directly short-circuited and exploded. 5. Discharge explosion The battery is over-discharged or over-discharged (greater than 3C) easily dissolves the negative copper foil deposited on the diaphragm, causing a direct short-circuit explosion between the positive and the negative (a rare occurrence). 6. Vibration explodes when falling. When the lithium-ion battery vibrates violently or falls, the internal plates of the battery are dislocated, causing serious short circuits and explosions (rarely). Batteries have the potential to explode, but lithium-ion batteries are better, and they have a more stable discharge. Based on the above content, using the correct method can effectively prevent the possibility of lithium-ion battery explosion. 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: Analysis of the future development direction of lithium-ion batteries