What are the reasons for the battery explosion? How to prevent it?

If the protection circuit is out of control or the test cabinet is out of control, the charging voltage is greater than 5V, causing electrolyte analysis, a violent reaction occurs inside the battery, the internal pressure of the battery rises rapidly, and the battery explodes. 2. The overcurrent explosion 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 ions are too late to be embedded, and lithium metal is formed on the surface of the pole piece, penetrates the diaphragm, and the positive and negative electrodes are directly short-circuited and cause an explosion. 3. Explosion during ultrasonic welding of plastic case. When ultrasonic welding of plastic case is caused by the device, the ultrasonic energy is transferred to the battery core. The large ultrasonic energy causes the internal diaphragm of the battery 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 to explode. In addition, during spot welding, the positive electrode connecting piece was directly connected to the negative electrode, causing the positive and negative poles to explode after a straight short-circuit. 5. Over-discharge explosion. Battery over-discharge or over-current discharge (above 3C) will easily dissolve and deposit the negative electrode copper foil on the separator, causing the positive and negative electrodes to be directly short-circuited and explode. 6. Explosion during vibration drop The internal pole piece of the battery is misaligned due to severe vibration or drop caused by the battery, and it will explode due to a serious short-circuit in a straight line (a rare occurrence). How to prevent lithium battery explosion? All lithium battery explosions are caused by battery heating caused by a short circuit. The reasons for the short circuit are overcharge, overdischarge, direct connection of the positive and negative electrodes, and electrolyte leakage. Therefore, in the design of lithium batteries, the following points can be started: 1. It is forbidden to overcharge the lithium battery above 4.2V; 2. It is forbidden to overdischarge the lithium battery below 2.75V; 3. Install an explosion-proof valve on the metal casing; 4. , Prevent short circuit during the process. The best way is of course to have a lithium battery protection circuit board design. Although this will increase the manufacturing cost of lithium batteries, it is necessary for the safe use of lithium batteries. This design is inevitable for the products of all formal lithium battery processing manufacturers. 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: Introduction to the types and differences of lithium batteries