How did the explosion of lithium-ion batteries happen?

Penetrate the diaphragm and cause a short circuit to cause an explosion. 4. Ultrasonic welding will cause the positive and negative electrodes to explode after a short circuit and cause an explosion. Violent reactions occur in the battery. The lithium ion battery explodes, the positive and negative electrodes are short-circuited, and the protection circuit is out of control or The test cabinet is out of control so that the charging voltage is greater than 5V, and the positive pole connecting piece is directly connected to the negative pole during spot welding. However, lithium ion metal is formed on the surface of the pole piece, the short circuit of the positive and negative electrodes causes an explosion, and the internal pressure of the battery rises rapidly. Cause an explosion. 3. Over-discharge or over-current discharge (above 3C) of the over-discharged battery will easily dissolve and deposit the negative electrode copper foil on the diaphragm, causing the positive and negative electrodes to be directly short-circuited, causing the electrolyte to decompose and cause an explosion. When falling, the internal pole pieces are misaligned, and the ultrasonic energy is so large that the internal diaphragm of the lithium-ion battery melts. In addition, the overcurrent protection circuit is out of control or the test cabinet is out of control, so that the charging current is too large and the lithium is too late to be embedded. Ultrasonic energy is transferred to the battery core. 5. Spot welding. Excessive current during spot welding can cause a serious internal short circuit and cause an explosion. 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: What is the reason for the bulging of electric vehicle batteries?