Overcharge can cause the battery to explode?

Does battery overcharging really cause an explosion? In theory, this is indeed possible, but in actual use, battery manufacturers have already taken precautions inside the battery, so there is generally no explosion.

Battery explosion (picture from the network)

Lithium-ion batteries have high energy density and high voltage (the voltage generated by a single lithium-ion battery unit can reach 4.2V, while the ordinary nickel-based rechargeable battery is 1.2V). Compared with low-voltage batteries, lithium-ion batteries are charged . The redox reaction of the electrode is very severe, so the conditions of use of the lithium ion battery must be strictly limited. Overcharge, overdischarge, short circuit, high temperature, etc. can cause battery damage and even fire and explosion.

Lithium battery internal structure

However, the actual use of lithium-ion batteries is to pack several batteries together with a set of safety protection circuits and a variety of safety devices into a battery board. These safety designs ensure that the battery's circuitry is automatically shut off during overcharging, over-discharging, and short-circuiting; excessive internal pressure in the battery can also trigger decompression of the exhaust; if the battery temperature is too high, the hot-melt protection device can be triggered to block lithium ions. The movement thus stops the electrochemical reaction of the battery. Therefore, if the phone is fully charged and the power is not removed in time, it will not cause the battery to explode.

Reduce battery life and extend battery life?

As we all know, mobile phone batteries also have a long life, generally calculated by the number of charge and discharge times. So, will the frequent charging affect the battery life? Is it a charge and discharge number when plugging and unplugging the charger? I believe that there will be such doubts in the future, and the following will give you detailed answers.

Lithium battery charging and discharging diagram (picture from the network)

Generally, the life of a lithium ion battery can reach several hundred charge and discharge cycles, and such expressions are often seen in the specifications of batteries and equipment. Here, one charge and discharge cycle refers to the process of using the battery power and then refilling it, instead of plugging in the charger and then unplugging it once. Continuous deep charge and discharge of lithium-ion batteries has an impact on the life of lithium-ion batteries. The above hundreds of data are also measured under such conditions, but under daily shallow charge and discharge conditions, lithium-ion batteries The life span is actually quite long.

In addition, lithium-ion batteries are not used, and their capacity is naturally lost. The main influencing factors are voltage and temperature. Studies have shown that lithium ions are stored for a long time in a fully charged state, and their capacity is significantly lost. Similarly, the higher the temperature, the faster the capacity loss of the lithium-ion battery, and the loss is irreversible, that is, the capacity of the battery will be permanently reduced. In a 0 degree environment, the remaining 40% of the lithium-ion battery will lose 2% of its capacity after one year of storage. In a 40 degree environment, the fully charged lithium-ion battery will lose up to 35 years after storage. %.

So what is the correct way? First, frequent shallow charge and discharge will help to extend the life of the battery than deep charge and discharge. Do not think that charging more will damage the battery. This statement is not applicable to lithium-ion batteries. Therefore, a good habit is to plug in the charge when you have the opportunity, and then pull it out when it is almost full - a small amount of meals, but don't eat too much. Second, you should minimize the time the battery is fully charged. Do not unplug the power supply after fully charging, it will keep the battery fully charged, although it will not explode, but it will speed up the loss of battery capacity.

However, if you are not using the original battery, but the quality of the cottage battery is not guaranteed, it is difficult to ensure the safety of the battery. Because most of them will not produce according to the prescribed standards. It is inevitable that problems will arise. So choose the original battery or a large brand battery with guaranteed quality.

Calling the phone while charging will explode?

I believe that many people have the habit of playing games or making phone calls while charging their mobile phones. Is there any danger in this way? It is said that there are protection circuits inside the mobile phone, which will not cause danger. However, there have been reports in the past that a man who was on the phone while charging the phone caused the phone to explode and the party was killed on the spot. Then, when you charge while you are on the phone, will it cause an explosion?

In fact, in all regular branded mobile phones, protection circuits that prevent safety accidents, such as fuses, are designed. When the external current is too large or short-circuited, the fuse will be burned off, thus cutting off the contact with the bad power supply and protecting its electronic products; the protection circuit of the mobile phone is mainly near its most important IC and CPU, whenever there is bad current information passing Automatically tripping, or providing additional power when the phone battery is suddenly interrupted to supply the phone to continue to save data after shutdown, without losing it, the IC and CPU of each genuine phone will be given a limited job during design. Current and current are generated by data information. If the data information conflicts or suddenly increases, the current supplied to the IC and CPU must be high. At this time, the protection circuit will cut off the current to protect the mobile phone. Security. Therefore, under normal circumstances, even if you call while charging, it will not cause the phone to explode.

Although there is no safety problem in theory, it is impossible to rule out the failure of individual protection measures. If a battery produced by an informal manufacturer is used, it is very likely to cause a mobile phone to explode. Therefore, as far as insurance is concerned, everyone should try not to charge the mobile phone. Call.

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