Reasons for Lithium Battery Explosion-Internal Structure Design

Causes of Lithium Battery Explosion The internal structure design concerns that lithium batteries will cause mobile phones to explode, which has always been a source of anxiety for people before and after get off work. Global brands such as Dell and Apple have had similar embarrassing experiences. This leads to a question: Is lithium ion explosion unpreventable? What mobile phones, notebooks use lithium batteries, so-called lithium batteries rely on lithium ions to move between the positive and negative electrodes and release the power and release of the device. It requires lithium ions in the positive electrode. There is no additional factor for the continuous movement of the negative pole, namely clean ground movement. In theory, this can be done, but in practice, as lithium batteries are highly sensitive products, any unusual circumstances will cause problems. All lithium battery explosions are caused by short circuits, causing short circuits, overcurrent, and overheating. The most important thing is that they all go through the internal structure of the lithium battery to form a battery short circuit. The so-called internal resolution has an external meaning. The structure of the lithium battery itself is a process of processing, and it is difficult to prevent 100% of defects during the processing. The positive and negative electrodes should be clean when the lithium ions stay, and the gap should be free of impurities when the electrolyte is flowing. However, it is difficult to completely prevent metal dust, copper or aluminum foil and other impurities from the electrolyte and the gap during processing. When people use lithium batteries improperly (overcharge, overdischarge, overcurrent) or place them in a polar environment (too high temperature), the lithium battery will overheat, the fragments will be broken at room temperature and quiet, and then in the hot electrolyte Space heat movement. Next, assuming that the debris is close to the gap, the hot debris will affect the barrier of the gap and form a short circuit. It can be seen that the short circuit is caused by two reasons: one is that there are impurities in the battery, and the other is that the impurities will move. The intermediary between the two is heat. Therefore, the short circuit must be accompanied by heat, and the heat is not necessarily a short circuit. Third, a short circuit causes sparks. The electrolyte is a flammable liquid, which can cause the battery to burn and explode in a limited space. This is easy to understand. Therefore, there is now a polymer lithium battery that can use gel electrolyte instead of liquid electrolyte to reduce the possibility of short circuits. But this cannot be completely prevented. Once a battery is attacked and short-circuited, depending on the structure and temperature of the battery, generally speaking, the battery will have three situations: leakage, incineration and blasting, and the safety problem caused by incineration is the most serious. 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: Safety Management of Lithium Battery Pack-SOC