What is the root cause of the explosion of lithium-ion batteries?

If the circuit is out of control or the detection cabinet is out of control, the charging voltage is greater than 5V, causing the electrolyte to parse, the battery will generate a violent echo, the battery's internal pressure will rise rapidly, and the lithium-ion battery will explode. 2. Overcurrent explosion protection circuit is out of control or detection cabinet is out of control, so that the charging current is too large and lithium ions are too late to be embedded, and lithium metal is formed on the surface of the pole piece, penetrating the barrier, and the positive and negative poles are directly short-circuited to cause an explosion. 3. Explosion during ultrasonic welding of plastic case. When ultrasonic welding of plastic case is caused by the equipment, the ultrasonic energy is transferred to the battery core. The large ultrasonic energy melts the internal partition of the battery, and the positive and negative electrodes are directly short-circuited, resulting in an explosion. 4. Explosion during spot welding. Excessive current during spot welding caused serious internal short-circuits and exploded. 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 Li-ion battery over-discharge or over-discharge (above 3C) easily dissolves and deposits the negative electrode copper foil on the barrier, causing the positive and negative electrodes to directly short-circuit and explode (rarely produced). 6. When the battery is dropped due to vibration, the internal pole piece of the battery is dislocated due to the violent vibration or the 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: How to deal with the heat dissipation problem of the ternary power lithium-ion battery pack?