Analysis on the type of battery explosion

The types of battery blasting can be divided into external short circuit, internal short circuit and overcharge. The external connection here refers to the outside of the battery, including short circuits caused by poor insulation planning inside the battery pack. When the external battery attacks the short circuit, the electronic components and circuits fail to block, the internal battery will attack the high heat, the component electrolyte will evaporate, and the battery casing. When the internal temperature of the battery reaches 135°C, high-quality interstitial paper will close the pores, the electrochemical reaction is continuous or nearly continuous, the current suddenly drops, and the temperature gradually drops to prevent explosion attacks. However, the sealing rate is too bad, otherwise the gap in the root of the hole will not be plugged up, which will cause the battery temperature to continue to rise, and more electrolyte will evaporate. After all, the battery casing will burst, and even the battery temperature will cause the material to burn and burn. explosion. The internal short circuit is mainly caused by the burr between the copper foil and the aluminum foil or the dendritic crystals of lithium atoms penetrating the diaphragm. These tiny needle-like metals can form microcircuits. Because the needle is very thin and has a certain resistance value, the current is not necessarily large. The burrs of copper foil and aluminum foil are formed during processing. The observed phenomenon is that the battery leaks too quickly. Because the burr is so small, it sometimes burns off, allowing the battery to return to normal. Therefore, the probability of blasting caused by burr short circuit is not high. Such a statement can often be supported by calculations from the low-voltage bad battery but few bursts shortly after the internal charge of each battery factory. Therefore, the blasting caused by the internal short circuit is still mainly caused by overcharge. Because, after charging, there are lithium needle metal crystals everywhere on the pole, and the pinhole points are everywhere, and they are attacking micro-short circuits everywhere. Therefore, the temperature of the battery will gradually rise, after all, high temperature will cause gas in the electrolyte. This phenomenon, whether it is an attack that causes the data to be incinerated and blasted due to excessive temperature, or that the shell explodes first, causing the air to enter the lithium metal to violently oxidize, it is the end of the blasting. However, the explosion caused by an internal short circuit does not necessarily occur during charging. Perhaps the battery is not hot enough for data incineration, and there is not enough gas to burst the battery case, so consumers will charge the phone and take it out. At this time, a lot of micro-short circuit heat attacks will cause the battery temperature to travel gradually, and it will burst after a period of time. According to descriptions, customers picked up their phones, found them hot, threw them away, and blew them up. In summary, we can focus on preventing overcharge, preventing external short circuits, and traveling battery safety. In the case of overcharging and external short circuit, it is necessary to prevent electronic protection, which has a greater relationship with battery system planning and battery pack equipment. Chemical and mechanical protection is the key to battery safety. 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 post: How to prevent lithium battery explosion?