What are the reasons for the explosion or combustion of lithium batteries?

We first analyze why lithium batteries explode or burn from the perspective of electricity. Combustion or explosion usually occurs because heat is accumulated and cannot be diffused, and it accumulates to the point of fire, or if heat accumulates to a certain extent in a certain space, it will happen. As a battery, in the final analysis, the above-mentioned situation usually does not have the following four reasons. 1. Internal short circuit (mostly soft package large monomer): structure or process defects lead to the insertion of the tabs, the surplus of the diaphragm is too small, burrs, and the diaphragm is discounted. Tab insertion often occurs in thick storage batteries and internally connected in parallel. Insulation of tabs is not in place. Adding a protective plate to the subsequent finished product or using the process will easily cause an internal acute short circuit and cause combustion or explosion (internal short circuit: this is personally I have a deep experience. At that time, more than 2K batteries of this kind were scrapped. The actual design defect was abnormal in nature: internal acute short circuit), but now this situation is almost rare, unless external forces are involved. 2. External short circuit: The explosion after burning caused by the external short circuit of the battery below 1AH is rare. It is usually caused by bulging or simply burning the tab. Personal analysis is caused by the external short circuit of the power lithium-ion battery or the large-capacity mobile phone battery. Burning. This involves customers improperly installing metal outer boxes without considering tab insulation, and abnormal battery smoking and burning occurred at the installation site; power lithium-ion batteries also often have insufficient structural fixation measures (not thoughtful), and the battery pack is used during the user’s use. Shaking can cause damage to the external insulation and protective film of the battery or damage to the connecting wire, which will eventually lead to short-circuit burning. 3. Overcharge explosion: This is the most dangerous and the one that the company fears most, but it still happens occasionally. From what we know, there are two points: a. The user does not use the matching charger as required, which damages the protection circuit and the user often charges for an unlimited time. In this case, it is difficult to not explode; b. It is unreasonable and the protection board fails. In this case, it will be a mess... The same is true for single-cell batteries. 4. The material of the battery itself is not good enough. If the material is not good enough, it may overheat under the calibrated voltage and current, which may cause an accident. 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: How to judge the quality of electric vehicle batteries?