Internal shorting (primarily large, soft-packaged monomers): structural or process defects result in polar tab insertion, too little excess in the membrane housing, flashing, discounting on membrane, etc. Pole tab insertion often occurs in structures with thick batteries and internal parallel connections. The pole tabs are not insulated in place. Adding protective plates to the subsequent finished product or during use can easily lead to acute internal short circuit, resulting in combustion. or explosion (internal short circuit: this is usually the case) I have deep experience that more than 2K batteries of this type have been discarded at this time. It was actually a design flaw and the bottom line was: an acute internal short circuit. this situation is almost rare these days, barring external factors.
2. Short circuitit external: Post-combustion explosions caused by external shorts in batteries less than 1AH usually bulge or simply burn the tabs. I have personally taken the lithium-ion batteries apart or they are on fire. caused by external short circuit of large capacity mobile phone batteries. This involves customers incorrectly installing the outer metal casing without considering the insulation of the tabs, causing the battery to smoke and burn abnormally at the installation site. It is also common for lithium-ion power batteries to have insufficient (not well thought out) structural fixing measures. . During user use of the battery, shaking may damage the battery's external insulation protective film or damage the connection wires, possibly leading to short circuit and burn.
3. Explosion of surcharge: This is the most dangerous and the one that businesses fear the most, but it still happens occasionally. From what we know, there are two points: a. Users do not use the corresponding chargers as required, thereby destroying the protection circuit and users often charge without time limit. This situation is difficult without causing a battery explosion; unreasonable and the protection board fails, it will explode in a mess...the same goes for a single battery. 4. The above three points are relatively common. In summary: Careful structural design and user operation according to specifications are important guidelines to guard against product combustion or explosion. I think the major battery manufacturers have already made reasonable improvements. have been taken, and I personally think that developings safer materials is the only way to ensure the safety of lithium batteries.