Mobile power core What kind of mobile power core is good?

With the increasing price war on smartphones, the popularity of smart devices is increasing. In 2016, China's smartphone users will reach 620 million, and in two years, it will break through the 700 million mark in 18 years. The growing market will expand the demand for smartphone-related accessories, the most closely connected is the mobile power! However, due to the lack of standardization and maturity of the mobile power market, many small brands and manufacturers are robbing the market every year. A large number of counterfeit and shoddy products cause poor consumer experience and even personal and property damage. iWalk is the IDB rated iBrandTOP20 award-winning world Apple & smart accessories brand is obliged to popularize some knowledge about mobile power. This article covers the core components of mobile power, the battery core, which is the mobile power battery that everyone often asks. A good question to answer, and at the end of the article, briefly introduce some mobile power purchase methods and techniques, I hope everyone will gain something.

A growing popularity of smartphones

Composition and classification of electric cores

First of all, look at the three main components of mobile power supply, namely, the core, the circuit board, and the outer shell. Among them, the core is the core component, which consists of a positive electrode material, a negative electrode material, an electrolyte, and a diaphragm. It is one of the most influential factors that affect the charging and use of products. If it is consistent from the point of view of product cost, a charging device costs 60 % of the core, and the remaining circuit boards and shells account for only 40 %.

The current charging core is a lithium-ion battery. According to the electrolyte material, it can be divided into liquid lithium-ion batteries and polymer lithium-ion batteries. According to the main classification of the market can also be divided into: 18650 core, polymer core, lithium iron phosphate core.

Cylinder 18650 core

At present, the most used lithium ion core on the market is 1,8650, which has a share of up to 70 %. Most of the remaining products are polymer lithium batteries, and the lithium iron phosphate core mentioned above has not yet been popularized. The following iWalk will be introduced according to the product performance and characteristics of different cores:

1, 18650 core

The technical term is called lithium cobalt acid core, and the public prefers to call it the 18650 core, commonly known as the enlarged version of the 5th battery. It is a cylinder battery with a diameter of 18 mm and a height of 65 mm. Like a large battery number 5, it is easy to distinguish by its appearance. At present, the technology of the 18650 core is relatively mature. Its battery structure is stable, its specific capacity is high, and its comprehensive performance is outstanding. Because of its compact size, it can be used in many areas. However, its safety is worse than that of polymer lithium batteries, and the number of cycles of the core is low, only about 300 times.

18650 core shell information

2, polymer core

The technical term becomes nickel cobalt manganese core, and its polymer lithium ion is replaced by a colloidal polymer, which is "solid" or "colloidal." For what kind of good questions about mobile power core, iwalk recommends that you use polymer core.

Polymer core

The main advantages of polymer cores:

(1) The variety of appearance production, and the use of the 18650 battery products thick and large, and the appearance of the same thousand years.

(2) Long service life. Charged and discharged more than 500 times. No problem.

(3) Use high security, mostly used in high-end products. The safety of the polymer core is that there will be no explosion, and only drums and spontaneous combustion may occur.

(4) High capacity, under the same packaging volume(note, packaging volume), polymer cores can store more electricity, so most of them are lighter and thinner, have good portability, and directly improve the user's experience..

(5) The disadvantage is that the cost is high. The polymer core of the same capacity is at least 100 % more expensive than the 1,8650 lithium ion core.

3, lithium iron phosphate core

The lithium iron phosphate core battery is a new type of battery in recent years and can be said to be the best safe product for the time being. The number of recharging cycles has also reached about 2,000, and the safety is high and there is no pollution, but the two fatal disadvantages of this type of battery for mobile power supply are that it is large and expensive. These two factors determine that For the time being, This type of battery is rarely used in mobile power supplies. This battery is now mainly used in larger tools such as electric vehicles, small energy storage batteries, lawn lights, and electric tools.

lithium iron phosphate core

Major domestic and foreign core manufacturers

At present, the world's leading core manufacturers are mostly concentrated in South Korea and Japan. Japan is the birthplace of lithium batteries. Thanks to the integration of production and research and the importance of basic materials research, it is far ahead of the technology. Representative companies include Panasonic, Sony, and Toshiba. South Korea also occupies a pivotal position here. Representative companies include Samsung and LG.

From the domestic point of view, BYD, Bic International, Chuangming Battery, Dongguan Liwei, Yiwei Li-Neng, and Shanshan shares have a certain influence in this field. However, most domestic lithium battery industry cycle life, specific energy, safety and other comprehensive indicators lag behind Japan and South Korea. In a relatively simple example, it is also a 18650 core with a capacity of 2400 mA. The domestic core price is 6.5 yuan, while Samsung's price can reach 8.5 yuan. Core technology and advanced technology have created high costs for Samsung batteries. Even so, Samsung's core still leads the market with a comprehensive advantage.

Mention the specific energy here, which refers to the energy per unit weight or unit volume. The 18650 core capacity produced by domestic core manufacturers is mostly between 2200-2800 mA, and it is difficult to further increase. The 18650 core of Japanese and Korean companies has maintained the largest capacity record so far, and a single capacity can reach 3,600 mA or more. At present, the best stability and consistency is the capacity range of 2600 to 3000 mAh. The price of the 18650 lithium battery is proportional to the size of the capacity. The larger the capacity, the greater the energy ratio, and the more raw materials are used, so the price will be more expensive. The general price is 10 to 30 yuan/branch.

III. How to distinguish between the core and the core

At present, unless the use of professional testing tools for testing, it is difficult for ordinary consumers to judge the quality of products. If you are a demolition madman or a digital enthusiast, you can try to see that the core anti-wear surface is uniform, there is no brittle column, and there is no burr to judge. In addition, a good battery logo should be printed with the battery model, type, rated capacity, standard voltage, positive and negative pole mark, and manufacturing plant name. As an ordinary user, it is not recommended that there is a certain safety risk after all. Only after the purchase, pay attention to whether the charging is abnormal, such as abnormal heat, smoke, shell uplift, easy to disconnect and charge, or when the capacity is large but the charging and discharging time is short, which shows that the core has a certain problem. In fact, there is also a simple and rough way to judge the price, dozens of dollars can buy tens of thousands of capacity charging treasure, please do not buy! Hey! Hey! Some people on the Internet also reported that they wanted to exchange goods after purchasing such products, but they were directly ignored by customer service personnel. Not everyone is willing to pay a lot of time and energy to properly defend their rights, so in the end they can only admit it.

Mobile Power Purchase Techniques

How to select mobile power? In fact, it is very simple, as long as consumers pay attention to the product's high popularity, moderate price, not too large capacity nominal, check whether the overall production process is excellent, product quality certification such as UL-certification can basically screen most of the inferior products.

The page contains the contents of the machine translation.