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With the prevalence of large-screen smart phones, there are fewer and fewer mobile phones with a standby time of more than one day due to the bottleneck of battery technology. This has led to a new product category - mobile power supply, or charging bank (hereinafter referred to as charging bank).

With the progress of technology, the 5000 milliampere power bank is still the starting point. 8000, 10000, 15000 and even 20000 mA mobile power supplies are everywhere. The current market of rechargeable battery is very chaotic, ranging from tens of yuan to hundreds of yuan, and all kinds of brands are blinded (there are hundreds of brands about the category of rechargeable battery in a domestic e-commerce company). However, there are many ways in the power bank. For example, its appearance includes round, flat, long, square, flaky and even plush toys! There is also a difference in its standard, such as the watt-hour at the airport, rather than the milliampere as we commonly call it. There are more and more functions, such as storage, wireless routing, card reader functions, and so on.

The most important part of the discharge efficiency is the core. What is it?

The current rechargeable battery cells are generally divided into 18650 cells and polymer lithium ion cells.

Their appearance is also easy to distinguish.

Cylindrical and relatively thick charging batteries are generally 18650 cells.

The size and appearance of polymer lithium ion cells can be customized. For example, some very thin, strange-looking and flaky rechargeable batteries.

Now there is a saying that the 18650 battery cell is lower than the polymer lithium-ion battery cell. I always feel that there are several rechargeable batteries in it. Is this true?

Of course not!

There are 18650 cells in Tesla. Do you think it will be bad? The battery is divided into Class A, B and C. If all of them are Class A cells, the discharge efficiency of cells at the same milliampere is almost the same. This is mainly a marketing strategy used by high-priced manufacturers who sell polymer lithium ion batteries to attack their competitors. You should understand this.

So the myth that the type of cell is better does not exist. The important thing is the grade of the battery. We should recognize the brands of large manufacturers to ensure the grade of the battery.

Nominal 5000 mA can be charged with 5000 mA

not always!

This is related to its charge and discharge efficiency.

The conversion efficiency of most power supplies is close to 76%, which is good. For example, 10000 mA can charge 7600 mA to your mobile phone, which is very good conversion efficiency.

Of course, the volume ratio is very important! The higher the milliampere number, the smaller the volume, the better. This is the reason why the card type and hand account type rechargeable batteries are popular now.

Is it easy to explode?

Principle: There is electrolyte in the battery. For example, the 18650 cell contains more liquid, while the polymer lithium ion cell is close to semi-liquid and semi-solid. There is one phenomenon in all liquids: gasification. When the quality of the cell is not good and the activity is too strong, the temperature inside the cell will rise and it will vaporize. When the liquid is vaporized, its volume will expand rapidly, and it will exert pressure on the shell of the charging bank. At this moment, you will feel an explosion.

For example, the "explosion" of the Beijing subway charging bag that you have heard of only emitted a lot of smoke from the woman's bag, but there was no explosion of pyrotechnic flint.

Is metal shell safer than plastic shell?

Of course not!

Because of the low hardness of plastic, it will accumulate less pressure than metal. However, once the metal shell with inferior quality is encountered, the consequences will be unimaginable.

Therefore, it is a fallacy that metal shells are safer.

The safety of the power bank comes from: circuit board quality+battery level.

PS: In summer, please take out the charging bag to charge, instead of putting it in the bag. It also needs heat dissipation

Many power packs have two charging ports, one is 2.1A and the other is 1A. Does 2.1A charging break the phone?

Of course not!

The mobile phone is very smart. It has a charging protection circuit. If all mobile phones have a door, and some mobile phones can be designed to be fully opened, it is affordable; Some can't bear to close the door.

PS: This 2.1A is designed for tablets. Because when the battery of the tablet is low, it can only be charged with 2.1A.

You must carry the power pack with you when you fly

The Civil Aviation Administration has stipulated in the Announcement on the Regulations of Civil Aviation Passengers Carrying "Power Bank" (hereinafter referred to as the "Announcement") that when passengers carry power bank on board, power bank can only be carried in their hand luggage or carried with them, not checked in. At the same time, the rated energy of the power bank shall not exceed 100Wh (watt hour), without the approval of the company; The rated energy exceeding 100Wh but not exceeding 160Wh can only be carried with the approval of the company, but each passenger shall not carry more than two power packs.

"It is strictly forbidden to carry a power bank with a rated energy of more than 160Wh. It is forbidden to carry a power bank without a rated energy, which cannot be calculated by other parameters marked." The Civil Aviation Administration said, "During the flight of the aircraft, it is forbidden to use the power bank to charge the electronic equipment. For the power bank with a start switch, it should always be closed during the flight."

According to the reporter, the Announcement has been implemented since the date of publication, and this provision also applies to the crew.

Most of the power packs on the market are within the allowable carrying range: there must be a marked value

In fact, "watt-hour" is the unit of electric power. If you want to know whether the power pack you carry meets the requirements, you can check the battery voltage and capacity marked on the power pack according to the Method for Determining the Rated Energy of Power Pack published by the Civil Aviation Administration.

At present, the capacity of most common charging banks on the market is between 3000 and 15000 mA, and the capacity of individual charging banks is 20000 mA, and the voltage indicated by most charging banks is between 3 and 5 volts. According to the formula of the rated energy value, the rated energy value of the 20000 milliampere charging bank is 100Wh at the voltage of 5 volts, which just reaches the upper limit of the capacity that can be carried without the approval of the civil aviation company.

"Referring to the above standards, most of the power packs can be boarded." The staff of the security inspection department of the Capital Airport said, "However, the power packs without any numerical value are not allowed to be carried. Such power packs will be temporarily kept at the airport, and passengers can pick them up at the airport with the tickets."

How to judge whether the power bank can be brought on the machine

1： The rated energy Wh (watt-hour) is directly marked on the charging bank

1. Rated energy ≤ 100Wh does not require company approval

2.100Wh, rated energy ≤ 160Wh, can only be carried with the approval of the company

3. Rated energy ≤ 160Wh

4. It is not allowed to carry the rated energy if it is not marked or calculated by other marked parameters

2： The rated energy Wh is not directly marked on the charging bank

1. If the charging bank is marked with voltage (V) and capacity ampere-hour (Ah), the rated energy value can be calculated: Wh=V&TIMes; Ah

2. If only milliampere hour (mAh) is marked on the charging bank, the value can be divided by 1000 to get ampere hour (Ah).

For example, the figure above shows that the nominal voltage of the charging bank is 4.8~5.4V, the nominal capacity is 7800mAh, and the rated energy is:

7800mAh÷1000=7.8Ah

5.4V&TImes; 7.8Ah=42.12Wh

So it is up to standard.

Conclusion:

1. You must carry the power pack with you (up to two);

2. There must be marked values;

3. If the power bank is ≤ 100Wh, you can board the aircraft;

4. Power bank ≤ 20000Ah, you can get on the plane.

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