What are the general situations of lithium battery pack explosion?

There are generally the following situations when a lithium battery pack explodes: 1. The overcharge explosion protection circuit is out of control or the detection cabinet is out of control to cause the charging voltage to be greater than 5V, causing the electrolyte to decompose, a violent reaction occurs in the lithium battery pack, the internal pressure of the battery rises rapidly, and the battery explodes. 2. The overcurrent explosion protection circuit is out of control or the detection cabinet is out of control, so that the charging current is too large and the lithium ions are too late to be inserted, and lithium metal is formed on the surface of the pole piece, penetrates the diaphragm, and the positive and negative poles are directly short-circuited to cause an explosion (rarely). 3. Explosion during ultrasonic welding of plastic shell. When ultrasonic welding of plastic shell is caused by equipment, the ultrasonic energy is transferred to the battery core. The large ultrasonic energy causes the internal diaphragm of the lithium battery pack to melt, and the positive and negative electrodes are directly short-circuited and an explosion occurs. 4. Explosion during spot welding. Excessive current during spot welding caused serious internal short-circuit explosion. In addition, during spot welding, the positive electrode connecting piece was directly connected to the negative electrode, causing the positive and negative poles to directly short-circuit and explode. 5. Over-discharge explosion The over-discharge or over-current discharge of the battery will easily cause the negative electrode copper foil to dissolve and deposit on the diaphragm, causing the positive and negative electrodes to directly short-circuit and explode. 6. When the battery is dropped due to vibration, the internal pole piece of the battery is dislocated due to severe vibration or drop, which directly causes a severe short circuit and explodes. 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: What are the charging methods for lithium battery packs for electric vehicles?