Talk about the cause of the explosion of lithium batteries

The explosion of lithium batteries can be seen everywhere in daily life, from electric vehicles to computer motherboard batteries to various safety accidents caused by lithium batteries. The most impressive phenomenon is the explosion and fire caused by lithium batteries. There are still some flaws in the battery design. When the battery is fully charged and defective, the temperature of the battery rises, resulting in excess energy, the electrolyte decomposes to produce gas, and the internal pressure of the battery increases sharply, leading to spontaneous combustion or explosion. In this case, we can choose a better core, such as polymer lithium batteries. The problems with smartphones, laptops, portable batteries and similar electronic devices stem from chargers or lithium batteries. The following lithium battery manufacturers explain the reasons for the explosion of lithium batteries. Rechargeable batteries can now store large amounts of electrical energy in a small space. When the battery runs in the desired mode, it slowly outputs energy in a controlled manner. If the cause causes the rapid release of energy, such as a man-made short circuit, there is a risk of explosion or fire. I have seen some batteries catch fire, some are intentional (the mechanical properties of lithium batteries will be deliberately destroyed), and some are unexpected. 1. There are too many positive electrodes in the design, or the coating is not uniform, the vibration during transportation causes the plate to be dislocated, and lithium dendrites appear during charging. 2. Vibration during transportation causes the pole plate to be misaligned. When the electrode expands, the pole plate is short-circuited through the shell or the connecting plate. 3. Short circuit caused by burrs, dust, vibration and expansion. 4. Poor diaphragm. 5. Excessive current of spot welding nickel belt will damage the inner and outer membranes or add metal dust. 6. The voltage and temperature during the transmission process will cause the instability of the SEI layer. 7. Overcharge. When the battery is charged, the excessive release of lithium in the positive electrode will cause the structure of the positive electrode to change, and the excessive release of lithium will easily fail to be inserted into the negative electrode, and it will also easily lead to the evolution of the surface of the lithium negative electrode. When the voltage exceeds 4.5v, the electrolyte will decompose and produce a lot of gas. 8. Too much water. It can be processed in the cell reaction, water and electrolyte natural gas. When charging, the lithium reaction can generate and generate lithium oxide, which causes the battery capacity to be lost, and it is easy to overcharge the battery and natural gas processing. The water breakdown voltage is low, and the charge is easy to decompose. Gas, when the series of generated gas can make the internal pressure of the battery, the battery can not withstand the battery case, the battery will explode. The above is the reason why some lithium batteries supplied by lithium battery manufacturers exploded. It can be seen from the above that in addition to the design flaws of lithium batteries, there are also some problems during use. Therefore, the use of lithium batteries should follow the norms. 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: Explain the advantages of using forklift lithium batteries