What are the important reasons for the explosion of lithium-ion batteries

The out-of-control of the shielding circuit or the out-of-control of the detection cabinet causes the charging voltage to be greater than 5V, causing the electrolyte to parse, a violent echo is generated inside the battery, the internal pressure of the battery rises rapidly, and the lithium-ion battery explodes. 2. Overcurrent explosion protection circuit out of control or out of control of the detection cabinet makes the charging current too large, causing lithium ions too late to be inserted, and lithium metal is formed on the surface of the pole piece, penetrating the barrier, and the positive and negative electrodes are directly short-circuited and causing an explosion (rarely). 3. Explosion during ultrasonic welding of plastic case. When ultrasonic welding of plastic case is caused by equipment, the ultrasonic energy is transferred to the battery core. The large ultrasonic energy melts the internal barrier of the lithium-ion battery, and the positive and negative electrodes are directly short-circuited and exploded. 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 The battery is over-discharged or over-charged (above 3C), it is easy to dissolve and deposit the copper foil of the negative electrode on the barrier, making the positive and negative electrodes directly short-circuit and explode (rarely produced). 6. Explosion during vibration drop The internal pole piece of the battery cell is dislocated due to violent vibration or drop caused by the violent vibration or drop, which directly causes a serious short circuit and explodes (rarely occurs). 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 post: What are the main reasons for the self-discharge of lithium-ion batteries?