Ten reasons for spontaneous combustion of lithium battery packs

In daily life, lithium batteries can be seen everywhere, 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. Hefei lithium battery manufacturers will answer you what caused the explosion of lithium batteries? Rechargeable batteries can now store a large amount of electrical energy in a small space. When the battery runs in a predetermined mode, it will slowly output electrical energy in a controlled manner. If for any reason (such as a man-made short circuit), the electricity is quickly released, there is a danger of explosion or fire. I have seen batteries catch fire several times, some are intentional (the mechanical properties of lithium batteries are deliberately damaged), and some are accidental. As a practitioner in the lithium battery industry, I think there are many reasons for the battery to catch fire or explode: 1. Too many positive electrodes or uneven plating during design, vibration during transportation causes dislocation of the plates, 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. 9. Internal short circuit. Due to the internal short circuit phenomenon, the high current discharge of the core produces a lot of heat, burns out the diaphragm, and causes a greater short circuit phenomenon. Therefore, the core will have a high temperature and the electrolyte will decompose into gas, resulting in too much internal pressure. The core that cannot withstand the pressure will explode. 10. External short circuit. The external short circuit may be due to improper operation or misuse. Due to the external short circuit, the battery discharge current is large, which will cause the battery to heat up. The high temperature will cause the internal diaphragm of the battery to shrink or be completely bad, resulting in an internal short circuit and explosion. All these are the reasons for the spontaneous combustion of lithium batteries. Hefei lithium battery manufacturers note: There are many factors that affect the safety of lithium batteries, such as the use of inferior cores, packaging technology is not standardized, and improper use by users will cause certain safety problems, but we should also pay attention to it. After all, lithium batteries are Auto-ignition is only a small probability event. We cannot kill a group of people with one stick, nor can we consider from many aspects to minimize the external factors that cause lithium problems. We hope that relevant practitioners can improve their technology and testing capabilities. Users should also be aware of this process. 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: Laser welding process of power lithium-ion battery aluminum shell