Analysis of the power and reason of the explosion of lithium batteries for electric vehicles

The fire department has done lithium battery collision experiments. The lithium battery is taken from an old electric car. In order to guard against the power of the scene, the experimenters only used one of the small lithium batteries. The experimenter smashed the impact hammer weighing 1 kg against the lithium battery from a height of 1 meter. The small lithium battery leaked and smoked first, and then burst with a bang. The protective box was blasted with a hole, and the scene also caused a fire. And this is only one battery element. If it is a whole battery pack, the impact of the explosion will be very powerful. In the process of being released and out of control, some combustible gases and even some toxic gases such as hydrogen sulfide and hydrogen fluoride will appear in lithium batteries, which can cause harm and damage to people. The power of lithium batteries is huge. If used improperly, the consequences will be dangerous! So, under what circumstances will lithium batteries have potential safety hazards? The first is overcharging: continue to charge the battery without protective measures, there will be great safety risks. The second type is short circuit: internal short circuit may be some structural damage. The internal positive and negative electrodes are directly touched. External short circuit may include some conductive iron wire, copper wire or some metal pieces, forming an instantaneous large Electric current may cause heat generation and battery burning; the third type is heating: for example, the weather is hot, or the ambient temperature used is relatively high, it will also cause the ablation and shortening of some organic matter inside the lithium battery, forming a short circuit between the positive and negative electrodes of the battery , Will eventually form the burning and blasting of the battery. 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 article: The use of 18650 lithium batteries and three judgment methods for positive and negative poles