Analysis of the cause and explosion type of lithium battery

Auctor Iflowpower - Portable Power Station supplementum

1: The internal polarization is large. 2: the pole water absorption, reacting the drum with the electrolyte. 3: The quality of the electrolyte itself, performance problem .

4: The amount of liquid in the liquid does not meet the process requirements. 5: assembly The laser welding in the process is poor, leakage, leakage, leakage. 6: dust, polar dust is first easily causing micro-short circuit.

7: The positive and negative poles are thick, the shell is difficult. 8: Nipple sealing problem, steel ball sealing performance is not good to cause gas drum. 9: The housing material exists thickness, and the thickness of the housing deformation.

The type of exploded type decomposing the battery core explosion can be summarized as an external short circuit, internal short circuit, Three kinds of. The external system here refers to the exterior of the battery, which contains short circuits caused by poor insulation design in the battery pack. 当电芯外部发生短路时，电子元件没有被切断，电芯内部会产生高热量，导致部分电解液蒸腾，支撑电池外壳。

When the internal temperature of the battery is high to 135 degrees Celsius, the quality of the diaphragm is closed, the electrochemical reaction is terminated or near termination, the current is plummeted, and the temperature is slowly decreased, and the explosion occurred. However, the fine hole closure rate is too bad, or the fine hole does not close the diaphragm paper, which will make the battery temperature rise, more electrolyte, and finalize the battery housing, and even improve the battery temperature. Material burning and exploding.

The internal short circuit is to be because the brass foil is pulling the membrane of the aluminum foil, or the branches of the lithium atom wear the diaphragm. 这些细针可能会引起微短路。 Because the needle is very fine, there is a certain resistance value, so the current is not necessarily.

Copper aluminum foil burr is caused by processing, and it is observable. Moreover, since the glitch is small, sometimes it will be burnt, so that the battery will return to normal. 因此，因毛刺引起爆炸的概率并不高。

这样，就可以从每个电池单元的内部对短路电池进行内部充电。 但爆炸事件已经发生，但却得到了统计上的支持。 Therefore, the explosion caused by internal short circuits, it is still due to overcharge.

因为，它是针状的锂金属结晶，而且是微短路。 因此，电池温度会逐渐升高，最后高温会使电解质产生气体。 This situation, whether it is too high to make the material burns, or the outer shell is first striking, so that the air into the lithium metal is violently oxidized, all of which are explosion.

不过，这种因内部短路过度而引起的爆炸，并不一定发生在充电时。 有可能电池温度不够高让材料燃烧。 当气体出现，消费者不足以打破电池外壳时，消费者就会终止充电，带着手机外出。

这时候，许多微短路产生的热量，慢慢使电池的温度升高，一段时间之后，才会爆炸。 消费者常见的描述是拿起手机后发现手机发热，然后爆炸。