The popularity of large-screen and high-profile mobile devices has made DOCA mobile power (charging treasure) an effective assistant to protect life. It has been favored by many users, and some friends even purchase a variety of mobile power sources to cope with different situations of charging and use.
You are fooled by the business! Demystify the understanding of mobile power
Due to the lack of professional knowledge, consumers are vulnerable to the publicity of businesses when purchasing and using mobile power. There are also many misunderstandings. This article will analyze the common mistakes in mobile power and help you to avoid detours when purchasing and using mobile power. , Also avoid the impulse to buy low-priced and inferior products because of some propaganda.power bnak plant
The vast market has not only attracted many businesses into the mobile power industry, but also made the competition among products more fierce. Many businesses use false publicity to mislead consumers in order to sell products. Many misunderstandings are here to enter our consciousness.
You are fooled by the business! Demystify the understanding of mobile power
In addition, some users will use the habit of using rechargeable batteries such as nickel metal hydride batteries on mobile power, some friends will simply understand the product information from a literal meaning, all make mistakes in the understanding of mobile power, here we are for you one by one Interpretation.
Unsafe love explosion? Why is the 18650 widely used
The mobile power cell directly determines the capacity of the product, but because the cell is covered by the shell, the user cannot directly see the cell of the mobile power source, so this place is also where the merchant likes to make a fuss.
You are fooled by the business! Demystify the understanding of mobile power
The 18650 battery claimed by the merchant is not safe and has no basis
(The right side of the figure is actually the 5th battery that leaks the liquid. The picture is taken from Taobao.com)
We have seen in the news that mobile power batteries “explode” and let many consumers think that the 18650 batteries are more dangerous. Businesses have taken the opportunity to claim that their mobile power is more secure and they are equipped with many 18650 battery wreckage photos. Urging consumers to buy their products.
In fact, many news and business photos in the 18650 is not an explosion, but the battery positive pressure relief valve pops up when the internal pressure is too high, this is a normal performance of the safety batteries in harsh environments, the battery's shell Still intact, it is not appropriate to call it an explosion.
You are fooled by the business! Demystify the understanding of mobile power
18650 battery commonly used in laptops
In fact, because the technology is more mature, the consistency of the battery is very high, and the 18650 battery has been widely used. From small flashlights to large flashlights to Tesla electric cars, all 18650 batteries play a role. The vast majority of laptops use 18650 batteries, and it is normal for such a large amount of damage to occur. The 18650 batteries are not as explosive as they claim to be. As long as they are branded products, they also have good safety and security.
You are fooled by the business! Demystify the understanding of mobile power
Lithium-ion batteries with various dimensions (images from aliimg)
Note: Scientific knowledge
The 18650 is a model of battery size. It refers to a cylindrical battery with a diameter of 18 mm and a length of 65 mm. A liquid lithium ion battery is not a 18650 battery as long as it is made into other shapes, but its working principle and basic characteristics are still the same. .
Trickery? Thin design is not a polymer
Flat and thin batteries are polymer batteries? With 18650 easily exploding gimmicks, businesses like to advertise on polymer batteries, especially ultra-thin design products, consumers are more likely to believe this.
You are fooled by the business! Demystify the understanding of mobile power
Ultra-thin mobile power likes to claim polymer batteries (images from Taobao)
In current electronic products, especially in mobile power supplies, the so-called "polymer battery" is a gimmick, but the 18650 battery is replaced by a package. The cylindrical housing is replaced by an aluminum plastic film package. Its working principle is still the same. The correct name should be a soft-packaged lithium-ion battery.
You are fooled by the business! Demystify the understanding of mobile power
Liquid lithium-ion battery disguised as a polymer battery
Polymer lithium batteries are currently very few commercialized, and the current cost is very high, due to the greater difference in the charge and discharge efficiency of polymer batteries, it also reduces the overall performance of the finished battery pairing.
Lithium-ion battery
Rd
Battery indication
You are fooled by the business! Demystify the understanding of mobile power
You are fooled by the business! Demystify the understanding of mobile power
Cathode material
LiCoO2
LiNiCoMnO2
Negative electrode material
graphite
graphite
manufacturing cost
Lower
high
Cycles
300-1000
>500
Energy Density
140mAh/g
160mAh/g
Safety performance
well
well
In fact, there is no need to worry about this. Since the safety performance and battery capacity of polymer batteries and liquid lithium-ion batteries are not much different, the price of the latter is much lower, so you don't have to blindly pursue the so-called polymer batteries when you choose. Do not worry about whether the business is advertised as a polymer battery.
You are fooled by the business! Demystify the understanding of mobile power
The same package for liquid lithium-ion batteries
Note: Scientific knowledge
Polymer batteries and 18650 batteries are not one of the two classification methods of lithium batteries. 18650 is one of the battery's shape classifications, and the polymer is classified according to the lithium battery electrolyte. The two are not either. His relationship, so many businesses promote the battery classification is wrong.
Small size big energy? Lithium battery technology to be improved
An intuitive parameter when choosing a mobile power source is capacity. Large-capacity products make people feel more endurance protection. Products with higher values are also more popular with consumers. Businesses are also happy to “fill water” with capacity to make products better sold.
As we mentioned before, the differences in the technology of the battery manufacturers will cause differences in the capacity of batteries of different brands, but it should be noted that this difference only makes the difference in the energy density between different batteries, and it is insufficient. To open the gap by the order of magnitude.
In other words, if a branded mobile power source has a capacity of 10,000 mAh (37 Wh), and its volume-weight product will not exceed 15,000 mAh (55.5 Wh), this is the current technological decision. , And no black technology can make a small mobile power can have large capacity.
It can be understood that different batches of mobile power supply will have different capacity, but the Shanzhai products are not satisfied with this point. When the product capacity is directly marked with thousands or even tens of thousands of milliamperes, the user feels more "substantial."
The larger the mobile power is, the larger the mobile phone's capacity is, so the merchants generally do not produce products with too large capacity. If you see the product's publicity is a small size, I still advise you to look for another one.
Note: Scientific knowledge
At present, the single cell 18650 cell has a capacity of 2200 to 3400 mAh, the price is high when it exceeds 2800 mAh, and it is rarely used in mobile power; the volume ratio of the soft-packaged lithium-ion battery is not very different from 18650. There is also no significant difference in weight; the polymer battery has a slightly higher energy density but a slightly higher internal resistance.
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