Is the explosion of lithium-ion batteries unpreventable?

The fear of lithium battery explosions has been around for a long time, as have international brands such as Samsung and Apple. This leads to a question: Is the explosion of lithium batteries unpreventable? Lithium batteries are used in mobile phones and laptops. A lithium battery is a device that relies on the movement of lithium ions between the positive electrode and the negative electrode to carry out a chemical reaction to supply power and release. It requires lithium ions to shuttle between the positive and negative electrodes without additional influencing factors. Technically speaking, this design is completely feasible, but in practice, because lithium batteries are highly active products, any abnormality may cause battery problems. All lithium battery explosions are caused by short circuits, causing short circuits, overcurrent, and overheating. The most important thing is that they are all formed through internal structure and short-circuit batteries. The so-called from the inside to the outside of the lithium battery, the structure of the lithium battery itself is a process manufacturing process, and it is difficult to prevent 100% defects in the manufacturing process and the process. The positive and negative electrodes where lithium ions stay should be kept clean, and the electrolyte and diaphragm should be closed without impurities. However, during the processing, the electrolyte and membrane cannot be completely prevented from being contaminated by metal dust, copper foil or aluminum foil and other impurities. When people improperly use lithium batteries (overcharge, overdischarge, overcurrent) or place them in extreme environments (excessive temperature), lithium batteries will overheat, breaking the quiet state of the debris at room temperature, and allow Heat moves in the hot electrolyte space. Secondly, if the fragments are close to the diaphragm, the hot fragments will affect the isolation of the diaphragm and cause a short circuit. It can be seen that there are two reasons for the short circuit: one is that there are impurities in the battery, and the other is that the impurities will move. The medium of the two is heat. Therefore, a short circuit is necessarily accompanied by heat, and heat is not necessarily a short circuit. Third, we can easily understand that a short circuit will cause battery sparks, and the electrolyte is a flammable liquid that will cause the battery to burn and explode in a limited space. Therefore, there is now a polymer lithium battery that uses a colloidal electrolyte instead of a liquid electrolyte, which can reduce the probability of a short circuit. But not exactly. Once the battery is short-circuited, according to the structure and temperature of the battery, generally speaking, the battery will have three situations: leakage, burning and explosion, and the safety problem caused by burning is the most serious. 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: The energy density of ternary lithium-ion batteries is large, how about the safety performance?