Introduction to the cause of explosion and combustion of lithium batteries

The battery burns and explodes. Based on the on-site decomposition results, the reason for the appearance of the battery was decomposed. My personal understanding is as follows: one. Internal short circuit (mostly large monomers of flexible packaging): structure or process defects lead to insertion of tabs, excessive packaging of the diaphragm, burrs, and discounts on the diaphragm, etc. Tab insertion often occurs in thick battery structures and internal parallel connections. The insulation of the tab position is not in place. In the subsequent finished product or use process, it is easy to cause internal acute short circuit and combustion or explosion (internal short circuit: I know this very well. At that time, this battery was scrapped more than 2K pieces, which is actually a design defect. The abnormal essence is: Acute internal short circuit), but it is very rare nowadays, except for external factors. 2. External short circuit: An explosion after burning caused by an external short circuit of a battery less than 1h is rare, usually caused by ear bulge or simple burning. What I decompose is the burning caused by external short circuit of power lithium-ion battery or large-capacity mobile phone battery. This involves improper use of the user when installing the metal outer box, without considering the tab insulation, abnormal smoke and burning of the battery occur at the installation site; the common structural fixing measures of the power lithium-ion battery are not enough (not considered); and the battery The shaking of the bag will cause damage to the protective film on the outer edge of the battery or damage to the outer skin of the connecting wire during the user's use, and eventually cause short-circuit burning. three. Overcharge explosion: This is the most dangerous and terrifying time for the company, but it still happens from time to time. It is known that there are two points: one is that the user does not use the matching charger as required, which causes the protection circuit to be damaged. The user often charges indefinitely and it is difficult not to explode; the other is that the battery configuration is unreasonable, the protection board fails, and it will explode. . . The same applies to a battery. 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: What are the advantages and disadvantages of polymer lithium batteries