Detailed explanation of the lithium battery cell of the charger

With the advancement of technology, the 5000 MA/h charging treasure is still the starting number. 8000, 10000, 15,000 or even 20,000 MA/h of mobile power is everywhere. The current charging treasure market is very chaotic, from tens of dollars to hundreds of dollars, all kinds of brands have shook their eyes (a top e-commerce company in China has hundreds of brands on the category of charging treasure). But there are still many doorways in the charging treasure.

With the prevalence of large-screen smart phones, battery technology bottlenecks, fewer and fewer mobile phones with standby time of 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 5000 MA/h charging treasure is still the starting number. 8000, 10000, 15,000 or even 20,000 MA/h of mobile power is everywhere. The current charging treasure market is very chaotic, from tens of dollars to hundreds of dollars, all kinds of brands have shook their eyes (a top e-commerce company in China has hundreds of brands on the category of charging treasure). But there are still many doorways in the charging treasure. For example, its appearance, round, flat, long, square, sheet-like and even plush toys! There are also differences in its standards, such as the airport's watt-hours, rather than our common name. More and more functions, 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, 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 battery is divided into A, B, and C grades. If they are all A-class batteries, the discharge efficiency of the batteries under the same MA 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's important is the level of the battery. To look for the big brand, you can guarantee the battery level.

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, 10000 MA/h can charge 7600 MA/h 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 cell, and the polymer lithium ion cell is close to the semi-liquid 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, the safer metal shell is a paradox.

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, one 1A. Is charging with 2.1A charging the phone?

Of course not!

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

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

I have to take it with me on the plane.

In the "Announcement on the Provisions for Passengers Carrying "Charging Po" in Civil Aviation Passengers" (hereinafter referred to as the "Announcement"), the Civil Aviation Administration stipulates that when passengers carry the charging treasure, the charging treasure can only be carried in the hand luggage or carried with them, 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. It is not allowed to carry the rated energy without the rated energy, and the charging energy of the rated energy cannot be carried by other parameters.” The Civil Aviation Administration said, “It is forbidden to use charging during the flight of the aircraft. Bao 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.

The page contains the contents of the machine translation.