Detailed explanation of the lithium battery core of the charging treasure

With the prevalence of large-screen smart phones and their own battery technology bottlenecks, fewer and fewer mobile phones have been servicing for more than one day. This has given birth to a new product category - mobile power, or charging treasure (down to collectively called charging treasure).

With the advancement of technology, the 5000mAh charging treasure is still the starting number. 8000, 10000, 15,000 or even 20,000mAh of mobile power is everywhere. Nowadays, the charging treasure market is very chaotic. From tens of Yuan to hundreds of dollars, various brands have confused them (there are hundreds of brands in the category of charging treasures in China). But there are still many doorways in the charging treasure. For example, its appearance, round, flat, long, square, flake and even plush toys! There is also the difference between its standards, such as the airport to talk about time, not what we commonly call the milliamp. More and more features, such as storage, wireless routing, card reader functions and so on.

The most important thing in discharge efficiency is the battery. What is it about?

Today's charging treasure batteries are generally divided into 18650 batteries and polymer lithium-ion batteries.

Their appearance is also well distinguished.

Cylindrical, relatively heavy charging treasures are generally 18650 batteries.

The size and appearance of the polymer lithium ion battery can be customized. For example, some very light, strange, and patchy charging treasures.

There is now a saying that the 18650 battery is lower than the polymer lithium-ion battery, and it always feels that a few rechargeable batteries are inside. Is this true?

Of course not!

Inside Tesla is the 18650 battery. Do you think it will be worse? The batteries are divided into A, B, and C grades. If they are all A-class batteries, the discharge efficiency of the batteries under the same milliamperes is almost the same. This is mainly a marketing strategy that sells polymer lithium-ion batteries and high-priced manufacturers to attack opponents. Everyone needs to understand this.

So the so-called type of cell is better. This myth does not exist. What is important is the level of the battery. To be sure of the brand of the big manufacturer, the level of the battery can be guaranteed.

The nominal 5000mAh can charge 5000mAh.

Not necessarily!

This is related to its charge and discharge efficiency.

Most power supplies are close to 76% conversion efficiency is already good. For example, 10000mAh can charge 7600mAh to your mobile phone, which is very good conversion efficiency.

Of course the volume ratio is very important! The higher the MA, the smaller the better, which is why card-type and hand-held charging treasures are popular.

Is charging treasure easy to explode?

Principle: The inside of the battery is the electrolyte. For example, there are more liquids in the 18650 cells, and the polymer lithium-ion cells are close to semi-liquid and semi-solid. There is a phenomenon in liquids: gasification. When the cell quality is not very good and the activity is too strong, the temperature inside will rise and it will vaporize. When the liquid is vaporized, its volume will expand rapidly, which will put pressure on the charging treasure shell, and at this moment, what you feel is an explosion.

For example, the "explosion" incident of the Beijing subway charging treasure that I have heard of is only a large amount of smoke from the lady's bag, and there is no explosion of electro-optical flint.

Is the metal shell safer than the plastic case?

Of course not!

Because plastics have low hardness, they accumulate less pressure than metals. Once the inferior metal casing is encountered, the consequences are unimaginable.

Therefore, it is paradox that the metal shell is safer.

The safety of charging treasure comes from: board quality + battery level.

PS: Please charge the charging treasure in the summer instead of putting it in the bag. It also needs heat dissipation.

Many charging treasures have two charging ports, one 2.1A and one 1A. Is charging with 2.1A charging the phone?

Of course not!

The phone is smart and it has a charging protection circuit. If the mobile phone has a door, some mobile phones can be designed to be fully open, which is acceptable to others; some cannot accept the door and close the door.

PS: This 2.1A is designed for tablets. Because when the tablet is low, you can use 2.1A to charge.

You must carry it with you on the plane.

The Civil Aviation Administration of the Civil Aviation Administration stipulates in the "Notice on the Regulations for Passengers Carrying "Charging Po" in Civil Aviation Passengers (hereinafter referred to as the "Announcement") that when a passenger carries a charging treasure, the charging treasure can only be carried or carried in the hand luggage, and cannot be checked. At the same time, the charging energy rating does not exceed 100Wh (watt hours), no airline approval; rated energy exceeds 100Wh but does not exceed 160Wh, can be carried after approval by the airline, but each passenger cannot carry more than two charging treasure.

“It is strictly forbidden to carry a charging treasure with a rated energy exceeding 160Wh. The charging energy that does not indicate the rated energy or the rated energy calculated by other parameters indicated is strictly prohibited.” The Civil Aviation Administration said, “It is forbidden to use charging during the flight of the aircraft. Charging treasures charges the electronic device, and for the charging treasure with the start switch, the charging treasure should always be turned off during the flight."

According to the reporter's understanding, the "Announcement" has been implemented since the date of promulgation, and this provision is also applicable to the crew.

Most charging treasures in the market are allowed to carry: must have the indicated value

In fact, "Watt hour" is the unit of electric power. If you want to know whether the charging treasure you carry meets the requirements, you can check the battery voltage and capacity marked on the charging treasure according to the "Method for Judging the Rated Energy of Charging Po" published by the Civil Aviation Administration. Come calculate it yourself.

At present, most of the charging treasures on the market are between 3,000 and 15,000mA, and the individual charging treasures have a capacity of 20,000mA, and most charging treasures have voltages between 3 and 5 volts. According to the formula of the rated energy value, the charging power of 20000mA is rated at 100Wh under the condition of 5 volts, which is just the upper limit of the capacity that can be carried without the approval of the civilspecial company.

"According to the above criteria, most of the charging treasures can be boarded." The staff of the airport security inspection department said, "However, charging treasures that do not indicate any value are not allowed to be carried. Such charging treasures will be temporarily kept at the airport. Passengers can take the ticket to the airport."

How to judge whether the charging treasure can be brought on the machine

One: charging the treasure directly marked the rated energy Wh (watt hours)

1. Rated energy ≤100Wh without airline approval

2.100Wh "Rated energy ≤160Wh can be carried after being approved by the airline

3. Rated energy "160Wh is strictly prohibited to carry

4. The rated energy is not indicated, and the rated energy is not calculated by other parameters marked.

Two: The charging energy is not directly marked with the rated energy Wh

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

2. If the charging treasure is only marked with milliampere (mAh), divide this value by 1000 to get ampere-hours (Ah).

For example, the above picture: The charging treasure has a nominal voltage of 4.8 to 5.4V and a nominal capacity of 7800mAh. Its 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 it with you (up to two);

2. Must have a numerical value;

3. Charging treasure ≤100Wh, you can get on the plane;

4. Charging treasure ≤ 20000Ah, you can get on the plane.

The page contains the contents of the machine translation.