Cell phone battery overcharge and overcharge

Someone on the Internet asked: "The battery of the mobile phone outside is not full or 90 % filled with sleep batteries at night. Do you need to continue to fill it? Battery (cell phone lithium battery) after all is filled with a large injury or a large injury? "The following answer comes from battery practitioners.

Compared with lead storage, the biggest advantage of lithium electricity in performance is its long cycle life. Even if it is fully charged, there is no pressure for thousands of times.

However, the disadvantage is that it is sensitive to overcharge and overcharge. Once overcharge or overcharge, the battery will suffer irreversible damage.

In order to cope with overcharging and overloading, all lithium batteries have a complex and rigorous power management system (BMS, battery management system), which strictly controls the amount of electricity entering and leaving the battery, thus ensuring that the battery is always operating in a safe state.

Good mobile phone, power management system is very accurate, even if inserted in the charger, will not overcharge, even if overuse, will not overdo. Therefore, use it casually, when you go out, you are not full of electricity. If you feel that you will not shut down automatically soon, you will still have a portable power supply. Fill 90 % at night, you can keep filling. But for your own safety, I suggest you pull it out.

If the lithium battery power management system is not good enough, then, although overcharging and overloading will directly cause the battery to be scrapped, the overcharging effect is even greater for the user because overloading, at most, the battery life is over, but Overcharging, If the battery expands or explodes, it's a big problem.

It is said that the power management of Apple's mobile phone is very good. After it is full of electricity, it does not stop charging. Instead, it begins to discharge. After releasing about 5 %, it is refilled again.

Vaan.

The problem mentioned the mobile phone battery. Assuming that the owner does not use the cottage machine manufactured by the inexplicable manufacturer, because of the particularity of the cottage machine, we have no way to know the difference between the various cottage machines, and the design of the cottage machine is all kinds of strange and shoddy. It's not something you can imagine.

The battery we use now has a dedicated circuit board inside to ensure that the battery is over-discharged (discharging too much power to affect battery life) and overcharging (too much charge to affect battery life) Lifetime), it is very important that the overcharge is caused by the battery bulging. If the remaining amount of the phone case design is insufficient, the rear case will be lifted. At the same time, the current mainstream MTK platform products will have overcharge protection, but the specific design depends on each manufacturer, the general mainstream products will have overcharge protection, that is to say, you have no problem with plugging in the charger for a long time.

When we use batteries, the most important thing is battery life, and the battery life depends on the number of times the battery is charged. After 400 times, the battery power of a battery will drop to about 80 % of the nominal value. Where's the label? It's a bunch of numbers in front of the mAh on the battery, like 1400 mAh.

So we discuss the charging situation below. We simplify the various charging conditions into three types:

1. Battery power from 100 % to 0 %, and then recharge to 100 %

2. Battery power from 100 % to 50 %, and then recharge to 100 %

3. Battery power from 50 % to 0 %, and then only to 50 %

In three cases, the test standard is to reduce the battery power to the nominal 80 %. In the second method, most charges can be charged, followed by the first and the third worst.

So it should be filled with the best.

As for Apple's charging mechanism, the iPhone 4 to the iPhone 5s has changed so much that when the iPhone 4 and iPhone 4S are used, you will feel that the charge will always be full because it will always be charged at the same time as the discharge. The battery is constantly being charged, because I didn't use the iPhone 5, and I don't know what happened. When I used the iPhone 5s, I found that Apple's charging mechanism was completely different. It would check the number of times the charger was plugged in or the voltage of the battery. If you don't, the iPhone 5s will stop charging until you pull it out. And when you plug in the charger when you use the phone, the power consumed is the charger, will not take power from the battery, it can be said that the battery does not cost electricity.

Finally, Apple is always ahead of the rest of the industry, and when the company first heard about the Coulomb, it was already on the iPhone 4 and was used by the public. So the difference between today's handset makers and Apple is about two years or so. In the mobile industry, the difference of two years is enough to crush manufacturers, so Apple's profit margin has always been more than 30 %.

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