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To successfully let the lithium battery explode, it is necessary to let lithium or lithium ions directly contact with oxygen, can create this condition method, only the violence damage the battery shell (such as external force, into the fire, etc.), overcharge or short circuit Several, of course, the use of cottage inferior batteries are also included.
Let's take a look at the principle of lithium battery charging. Initially, the lithium atoms are stored only in the positive and negative electrodes, and the middle of the poles is separated by an electrolyte or an electrolyte (the lithium ion battery is an electrolyte, and the lithium polymer battery is a non-liquid electrolyte). In this case, the lithium in the poles is still relatively stable. Particularly in a lithium polymer battery, since lithium is present as a compound, it is not easy to cause a direct fire explosion even if it is in contact with oxygen.
  In the case of charging or discharging, the situation in the battery changes: the lithium atoms in one electrode lose an electron, become lithium ions, and through the middle of the electrolyte or electrolyte, into the other pole, re-become atomic state. The most dangerous situation is precisely in the process of lithium ion migration. The following is to see how you tortured these lithium ions or electrolytes (liquid).
  1, short circuit
  The so-called short circuit, I believe we all understand its principles. Lithium battery short circuit, the electrolyte or electrolyte will begin to accumulate heat. At first a small amount of fever does not seem to be a big problem, and once the heat to a certain extent, the electrolyte will begin to expand, the electrolyte is directly from the liquid into steam. In the final analysis of this problem caused by the worst case is the battery shell up, so the "moving" lithium ions finally get and oxygen "close contact" opportunities, the consequences of course can be imagined.
  2, overcharge
  Overcharge caused by the principle of explosion and short circuit is similar, but the culprit is not in the electrolyte or electrolyte, but the negative. In the case of the battery really facing the charge, the negative electrode has been relatively stable lithium atoms will be the embodiment of acicular lithium metal crystals, puncture the electrolyte (liquid) and the electrode between the membrane, so the charge and the positive connection, resulting in internal short circuit, left Under the process please see the first point. Another general lithium battery is a lithium battery protection board, specifically to protect the battery charge and discharge voltage stability, and temperature safety control (set the temperature limit, once beyond the limit will be power protection)
  3, the battery shell damage
  This is not to mention this, not to rely on the electrolyte (liquid), do not have to charge this is not enough to stimulate the way, but a direct knife to kill the battery shell, to a fish dead net broken, so the oxygen on the success of the battery into the internal, You have not had time to do "dismantling evaluation" it, the battery has been on fire or exploded.
Even so, lithium batteries are still safe   Hear here you guess you are frightened, this lithium battery and the big thunder and two kicks What is the difference? I would like to tell you that there is indeed a difference. First, short circuit, which we have three insurance: the use of good quality charging wire to prevent external short circuit, the phone internal protection mechanism to prevent short-circuit charging, the battery can be closed within the diaphragm to prevent overheating lithium ions continue to exercise. With these three steps, short circuit directly lead to fire explosion situation is already a very small probability of the event. And for overcharge, the current mainstream brand phones have overcharge protection circuit, will not let the full battery continues to be charged. So, scientists have long thought of these dangers, and take the corresponding mechanism, so the lithium battery dare to "openly" to enter our mobile phone, we do not have to worry about the big lay.
Another point, although a bit for the manufacturers to speak the meaning, but we must think of this problem: Apple, Samsung, etc. as the mobile phone shipments of millions or even tens of thousands of products, and then a small probability of events will be enlarged , So we have produced the illusion of poor quality iPhone, and that return to the actual risk, these brands are not higher than other brands, not to take them and those who do not fly the cottage products for comparison. Most of our concerns about the safety of mobile phone batteries are not all generated from these very few cases?
  Universal charge should have retired
  Let the battery explode the way I believe we have mastered. What if you want to avoid the battery explosion? First of all, please throw away your universal charge it! With the universal charge to the battery charge, the equivalent of a direct abandonment of the battery on the phone protection measures, not only the stability of the current can not be guaranteed, full of power will not be charged, likely to cause overcharge. As long as you use the non-cottage phone to the battery charge, then overcharge this situation will not happen.
  On the other hand, if your battery "drum package", the first time for the battery, do not reluctantly used, because such a battery has occurred within the short circuit, and then continue to use the shell may rise, easy Causing a fire explosion. Finally, we must use genuine batteries, do not be cheap to buy the spread of goods, the original battery is expensive, this is the most basic point to ensure safety.
Only to do the above, your normal charging operation will not constitute a threat of fire explosion, let alone charge a night, charge a year also nothing. Throw away your universal charge and poor battery it, these products is the culprit of the danger, long time to withdraw from the stage of history.
  We come back to see this period of mobile phone death events: girls sleep when the iPhone 4s electric shock, while the iPhone screen burst. According to everyone knows the common sense, the voltage charged for the phone only 5V, so high voltage can not directly contact with the human body. If there is a high voltage into the phone, the most likely situation is the charger failure, resulting in leakage, while the phone battery short circuit, causing an explosion, may be used with the purchase and use of poor quality charger. Therefore, we do not need this thing because of the psychological shadow, as long as the original accessories do not have to worry about, afraid of some unscrupulous profiteers to steal the charger and battery, we must be careful when buying a mobile phone.