The cause of 18650 battery explosion.

The cause of 18650 battery explosion，There are many reasons for the explosion of Li-ion Battery 18650:

1. The impact of battery materials on the safety of lithium batteries, as battery materials generally have thermal activity. When the external temperature or battery temperature continues to rise, the lithium battery part will undergo many thermal reactions. If the temperature continues to rise, there is a possibility of explosion for 18650 lithium-ion batteries. Therefore, the selection of positive and negative electrode materials for lithium batteries has a significant impact on the safety performance of the battery.

2.The quality control of various operational links in production is also an important factor affecting the safety performance of batteries, such as positive and negative electrode capacity ratio, slurry uniformity control, positive and negative electrode burrs, and detecting short circuits during cell winding to ensure the battery circuit is completed after production. When we use lithium batteries, if there is overcharging or external short circuit, internal short circuit can cause the lithium battery to overheat, and the rapid chemical reaction and expansion inside the battery can cause explosion.

3.High temperature
If the temperature is too high, it can also cause the 18650 lithium battery to explode. The normal operating temperature range for lithium batteries is from 0 to 45 ℃ during charging; Discharge -20~65 ℃; Store at 0-45 ℃. Generally speaking, the lithium battery protection board is set to protect the battery at a high charging temperature of 50 ℃; High temperature discharge protection at 70 ℃. If there is no high temperature protection, continuous discharge or storage of lithium batteries will basically cause lithium battery explosions.

4.Overcharge explosion
This is the most dangerous and feared by the company, but it still happens occasionally. From the understanding of the situation, there are two points: a. The customer does not use the matching charger as required, which damages the protective circuit. Generally speaking, customers charge without time limit, and this situation is difficult to avoid; b. If the 18650 lithium battery is improperly assembled and the protective board fails, it will also explode in a mess. The same applies to a single battery.

After explaining so much, let's summarize: In fact, for lithium batteries, the reason for explosion is understandable. After all, in the past, the grasp of stability was not so strong.