Explosion principle and charge error

In order to successfully blow up a lithium battery, lithium atoms or lithium ions must be directly exposed to oxygen. This method can be invented if the battery case is damaged by violence (external force, medium fire), overcharge or short circuit, and counterfeit batteries are used.

Let’s take a look at how lithium batteries work. First, lithium atoms are only stored in the positive and negative electrodes, and the positive and negative centers are separated by an electrolyte or electrolyte (lithium batteries are electrolytes; lithium is a non-liquid electrolyte). In this case, lithium is relatively stable in the north and south poles. Especially in lithium polymer batteries, lithium exists in the form of compounds, and it is not easy to directly ignite and explode even if exposed to oxygen.

In the process of charging and discharging, the state of the battery changes: the lithium atom in one electrode loses an electron, becomes a lithium ion, enters the other electrode through the central electrolyte or electrolyte, and changes from the zero state to the atomic state. The most dangerous situation is the lithium ion migration process. You can destroy these lithium ions or electrolytes like this.

1, short circuit

The so-called short circuit, I believe everyone understands its principle. When a lithium battery is short-circuited, the electrolyte begins to store heat. At first, a small amount of heat does not seem to be a problem, but once it is hot enough, the electrolyte begins to expand and the electrolyte begins to change directly from liquid to vapor. After all, the worst-case scenario is that the battery casing will rupture, so the repositioned lithium ions will eventually be close enough to oxygen, and the result can be imagined.

2. Overcharge

The principle of overcharge forming blasting is similar to that of short-circuit forming blasting, but the important reason is not the electrolyte or the electrolyte, but the negative electrode. When the battery is fully charged, the lithium atoms stabilized in the negative electrode will become metallic lithium crystals, penetrating the gap between the electrolyte (liquid) and the electrode. As a result, the charge will be connected to the positive electrode, causing an internal short circuit.

3. The battery cover is damaged

Not to mention, you don’t have to rely on electrolytes (liquids) or charge the battery in a less irritating way. You can damage the battery with just one tap on the battery casing. Therefore, oxygen can enter the battery smoothly, and the battery will catch fire or burst before you have time to disassemble the test.

Even so, lithium batteries are still safe

If you are scared, what is the difference between a lithium battery and a thunderbolt and two kicks? I want you to know that there is a difference. Short-circuit first is safe. We have three methods: use a qualityless charging cable to prevent external short-circuits and prevent short-circuit protection mechanisms from charging in the mobile phone. The battery can narrow the gap and prevent overheated lithium ions from continuing to move. Through these three steps, the possibility of a fire caused by a short circuit is now minimal. Regarding overcharging, mobile phones of mainstream brands now have a charging protection circuit, which prevents a full battery from continuing to charge. Therefore, scientists have long been aware of these risks and have established a mechanism to allow lithium batteries to openly enter our mobile phones. We don’t have to worry about large amateurs.

There is one more thing. Although it is a bit representative of the manufacturer, we must consider: Thousands of mobile phones are shipped every year, and the small probability will be magnified, so our inferior iPhone has such an illusion, and said Back to practice, the risks of these brands are not higher than other brands, let alone compared with their own knockoffs. Doesn’t our concern about the safety of mobile phone batteries come from these rare cases?

retired

makes us believe that we have a way to blow up the battery. So, what if you want to prevent the battery from exploding? First, please put down your universal charger! Universal charging is equivalent to giving up the battery protection of the mobile phone. Not only can it not guarantee the stability of the current, but it will not be cut off after charging, and it will only cause overcharge. As long as you use non-counterfeit mobile phones to charge, this will not happen.