Author ：Iflowpower – Portable Power Station Supplier
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. When a short circuit is outside the battery cell, the electronic component is not cut off, and the interior of the battery cell will have high heat, resulting in a partial electrolyte steaming, and support the battery shell.
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. These fine needles can cause micro-short circuits. 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. Therefore, the probability of the explosion caused by burrs is not high.
In this way, it is possible to have a short battery internally charged from the interior of each of the cells. However, the explosion event has occurred, but it has been statistically supported. Therefore, the explosion caused by internal short circuits, it is still due to overcharge.
Because, it is a needle-shaped lithium metal crystallization, and it is a micro-short circuit. Therefore, the battery temperature will gradually increase, and finally high temperature will electrolyte gas. 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.
However, this explosion caused by excessive internal short circuit is not necessarily occurring at the time of charging. It is possible that the battery temperature is not high to let the material burned. When the gas appears, the consumer is not enough to break the battery housing, the consumer will terminate the charging, with the mobile phone to go out.
At this time, the heat of many micro-short circuits, slowly increase the temperature of the battery, after a period of time, only explosion. The common description of the consumer is to pick up the phone and find that the phone is hot, and then exploded.
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