Analysis on the causes of lithium battery accidents

Analysis of the causes of lithium battery accidents Many people are afraid of lithium batteries, but this is not the case. This is impossible, because mobile phones, laptops, tablets, and other devices require it. Because I don't know when the lithium battery will suddenly have a terrorist attack in front of me: either burning or exploding. This kind of work is temporary, and is naturally related to the electrical characteristics and quality of the lithium battery itself, but it cannot be generalized. Whether the lithium battery is used correctly is also one of the reasons for the failure of the lithium battery. The correct use of lithium batteries is based on the characteristics of lithium batteries. Therefore, we first analyze the causes of explosion or combustion of lithium batteries from an electrical perspective. Incineration may explode, usually because heat cannot be dispersed due to heat accumulation, and it will explode if it accumulates to a fire point, or if heat accumulates to a certain extent in a certain space. As a battery, in summary, there are generally no four reasons for the attack in the above situation. 1. Internal short circuit (mostly large soft bag monomer): structure or process defects lead to the insertion of the tab, the film package is too small, burrs, film folds, etc. The battery lug interpolation usually appears in thick and parallel structures. The lug insulation is not in place. The addition of a protective plate in the subsequent product or the simple application process causes an acute internal short circuit, and then burns or blasts (internal short circuit: this person is deeply related Experience, and then waste batteries, the essential obstacles to the implementation of plans above 2k are disadvantages: but now this situation is rare, unless external factors. 2. External short circuit: Incineration caused by external short circuits of batteries below 1AH is rare. In general, 1AH The following incineration caused by external short circuit of the battery is swelling, or just burned the tab. Involving the customer's improper use, the tab insulation was not considered when installing the metal outer box, and the battery flue gas incineration at the installation site was abnormal; the power lithium-ion battery is also a common structure The lack of fixation methods (not thoughtful enough), the battery's external insulation protection film is damaged or the cable sheath is damaged due to the vibration of the battery pack during the user's use, and eventually leads to short-circuit incineration. 3. Overcharge discharge: this is the most dangerous and the most feared company It appears, but it still appears occasionally. According to my understanding, there are two points: a. The user does not use the matching charger as required, and then damages the protection line. The user usually charges the charger in an unlimited time. B The battery configuration is unreasonable, and the protection board fails. In this case, there will be an explosion of miasma. The same is true for the battery. 4. The data of the battery itself does not meet the standard. When the data does not pass, it may appear when the voltage and current are calibrated. The attack is overheated, and then the attack fails. Statement: Some pictures and content of the articles published on this site are from the Internet, if there is any infringement, please contact to delete the previous article: Analysis of the seven advantages of lithium iron phosphate batteries