What are the three causes of battery explosion?

There are three reasons for the explosion: 1. The battery shell explodes due to the high internal pressure of the battery. The working principle of the lead-acid battery is known to people in the battery charging process, especially at the end of charging, due to overcharging, the water is decomposed into hydrogen and oxygen, short circuit, serious The rapid rise of electrolyte temperature during vulcanization and charging will cause a large amount of moisture to evaporate. At this time, if the vent hole of the filling hole cover is blocked, because there is too much gas to overflow, the internal technical structure of the battery before the implementation of the new national standard of the battery is simple, and the pressure will rise. When the internal pressure reaches a certain pressure, it will burst from the junction of the battery slot cover or other weak points. This is a physical process. When the internal pressure of the battery is higher than 0.25MPa, the battery will burst, and the burst location is located at the hot air joint of the slot cover or the corner where the stress is concentrated. 2 The explosion limit of the battery explosion formed by hydrogen encountering an open flame. The explosion limit of the H2 and O2 mixed gas is 4%-96% of the volume of the mixed gas, and the explosion limit of the mixed gas of H2 and air is 4%-74% of the volume of the mixed gas. . If 80% of the overcharge is used for water electrolysis, the H2 content inside the battery is greater than the explosion range. When the hydrogen content in the battery or in the air accumulates to the explosion limit, it will explode when exposed to an open flame. Kind of chemical reaction. Studies have found that the explosion of the battery is a branched chain explosion reaction. Too many explosions of this kind occur in the case of overcharging. If there are virtual solder joints in the battery internal poles, through-wall welding, etc., the battery has a higher probability of explosion. A qualified battery will not undergo self-heating and explosive reaction under normal conditions of use. When the battery charging voltage is higher than 14.4V for gasoline vehicles and 28.8V for diesel vehicles, an explosion may occur under the condition that the fire exists at the same time. Through the inspection of the vehicle with the battery exploded, it was found that most of the voltage regulators were defective, and the battery was in a serious overcharge state. 3 Due to the blockage of the vent hole of the traditional lead-acid battery, the battery burst first, and the burst caused the battery to vibrate, and sparks appeared when the pole wiring was not strong, which caused an explosion. Disclaimer: Some pictures and contents of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What types of ternary anode materials for lithium batteries?