How to cool yourself in the face of "fever" performance mobile phones?

You may often see the word "xx enthusiast". In many fields, such as photography or film, the word "fever" is hardly associated with derogatory meanings. However, if the field is changed to computer or mobile phone , "fever" becomes a pun, which in some cases can be used to describe a mobile phone or computer with poor heat dissipation.

For mobile phones, the situation is more dangerous. The main reason is that the internal space is too compact, and there is no sign of deceleration performance improvement. Therefore, we can see various cooling measures in this narrow space.

01 Heat dissipating copper tube

The three mobile phone cooling measures discussed first in this article are all the results of the miniaturization of the computer cooling system. The first is the heat dissipation copper tube.

Whether it is a mobile phone or a computer, the internal heat is concentrated, that is, a small area will continue to heat. Therefore, there is a design that uses a device with strong thermal conductivity to guide heat away from the heat source, that is, "heat dissipation copper tube".

Heat dissipation copper tube (source: network)

In addition to the thermal conductivity of the metal itself, there will be liquid repeatedly evaporating and condensing inside the heat pipe. As we all know, evaporation absorbs heat and condensation releases heat. Using this physical property, the heat dissipation system will allow the liquid in the heat pipe to evaporate at the heat source and absorb the heat from the heat source. Then the steam will carry the heat to the other end of the heat pipe and drain the heat through condensation.

Copper tubes appear on mobile phones for the first time (source: network)

Interestingly, the debut of such a "hard core" design on the mobile phone has nothing to do with high-end performance mobile phones, but is dominated by a female oriented mobile phone. This mobile phone is the Medias X N-06E for the Japanese market in May 2013.

Media X N-06E (source: network)

The mobile phone from NEC was submerged in the long river of history because the mobile phone without heat pipe was rarely overheated at that time.

2015 Sony Xperia 5 Double copper tubes for heat dissipation (source: network)

Until two years later, the great leap of mobile phone performance made the additional measure of copper heat dissipation tubes become one of the necessary components of high-performance mobile phones. By 2021, the mobile phone cooling copper tube will no longer be an advanced technology, but will become the standard configuration of high-end computers.

02 Copper tube evolution version: VC soaking plate

The other device, called "VC soaking plate" or "vacuum chamber heat dissipation", has the same principle as the heat dissipation copper tube. It is wrapped with liquid by metal skin, and uses liquid gas conversion to remove heat. But the shape is different. It is sheet, not tube. The lamellar cavity cannot be easily bent like the tubular cavity, shuttling among the electronic devices with complex structure. However, if a thin layer of space can be vacated inside the equipment, VC soaking plate is usually a better choice.

VC soaking plate (source: network)

When the cooling copper tube works, the direction of heat transfer must be along the length of the copper tube. VC soaking plate can transfer heat to all directions, and has stronger ability to disperse heat. Moreover, due to the wider shape, the VC soaking plate has more contact with the heat source. In laptops and mobile phones, which cannot accommodate a large number of "desktop" copper tubes with large diameter, the VC soaking plate has a higher heat dissipation efficiency.

VC soaking plate in mobile phone is very thin (source: network)

However, VC soaking plates are also "high-end products", whether in the mobile phone field or on computers. Only those products that pursue extreme performance will be used, such as iQOO 7 , Black Shark 4 Pro and ROG mobile game 5 And other products. The VC soaking plates of the first two have a total area of more than 4000 square millimeters and 3000 square millimeters respectively, which has almost "drained" the internal space of mobile phones.

iQOO 7's VC soaking plate has the largest area

Although the cooling effect is obvious to all, the majority of people who often play large games are not. In other use scenarios, ordinary copper tubes are enough for heat dissipation, so VC soaking plates will not be popular in a short time. At least the large area VC soaking plates built in iQOO 7, Black Shark 4 Pro or ROG game phone 5 will still be in the minority.

03 Cooling fan

Before the invention of two-phase heat dissipation (copper tube, soaking plate), in order to make up for the lack of thermal conductivity of pure metal, people relied on large wind fans. With copper tubes and soaking plates, some of the previous cooling work that requires metal fins+fans can even be done without fans. If we keep the fan and replace the solid metal sheet with copper tube (soaking plate), will the effect be better?

One of the fans of Lenovo Saver's E-sports mobile phone 2 Pro

Of course, the answer is yes, because this cooling combination has dominated the PC market. However, the body of the cooling fan and the air duct that can circulate hot and cold air will take up a lot of space. It is difficult to achieve this in the mobile phone of "land is money", so it is unknown how many years after being used by PC products, the mobile phone finally ushered in fan cooling in 2019. However, the design of fan active cooling has not been popularized, and there are few mobile phones with similar designs.

Heat dissipation structure of Lenovo Saver E-sports mobile phone 2 Pro

The most interesting fan cooling mobile phone recently is the Lenovo Saver E-sports mobile phone 2 Pro. It has increased the number of fans to 2, and built square tubular air ducts wrapped in copper. It is a mobile phone with a very complicated cooling structure at present.

04 Adjust the layout of heating devices

Next, Lenovo Saver e-sports mobile phone 2 Pro. Let's introduce another effective but rarer way of mobile phone cooling, that is, to solve the problem "fundamentally" by moving the heat source device inside the mobile phone to a position that is less sensitive to temperature.

Central uplift means different internal layout

Because it is a device that is often touched by hand, the mobile phone can not only consider the processor frequency like the desktop computer, but also consider the human body temperature. So there will be hard core game phones such as Lenovo Saver E-sports mobile phone 2 Pro, or ROG game mobile phone 5. In order to reduce users' perception of heat, the motherboard, which is usually placed on the right side of the phone camera, will be moved to the middle of the phone. In this way, when holding the mobile phone horizontally to play games, users will not directly touch the motherboard area with the most concentrated heat, and the body temperature will be lower.

Main board 5 of ROG game phone is in the middle

However, this kind of design only works when the mobile phone is held horizontally. It is basically only suitable for game phones, so it is more difficult to popularize the central motherboard.

05 Depressurize the battery

The last way to cool the phone is "strange". It can solve the pain points of users, but it is hard to think of. That is to use the charger to bypass the battery and directly supply power to the mobile phone. Although playing "Original God" will make mobile phones very hot, there are not many people who play large-scale games on mobile phones for a long time. While charging while using, almost every mobile phone user has experienced the burning sensation.

Sony Schematic diagram of independent power supply mode of

Since 2020, there have been several mobile phones in the industry that can still supply power to mobile phones through the power supply when they are almost out of power, thus eliminating the sharp rise in temperature during charging. First, Sony Mobile Sony Xperia 1 II This feature has been added to the game mode of. Then more pure game phones also began to follow, such as the Lenovo Saver e-sports phone 2 Pro and ROG game phone 5 mentioned above.

06 There is no coldest, only colder

Although the industry has tried various cooling measures, even the fans on computers have been moved into mobile phones. But people's pursuit of mobile phone's functional diversity and strong performance will not stop. Accordingly, the development of cooling system has to keep pace.

For game phones, good heat dissipation can bring smoother pictures. For mobile phones that do not focus on performance, the improvement of the cooling system is also beneficial. Long time high-definition photo shooting and video recording, long time use of mobile phones in outdoor sunlight, etc., all have a severe test on the temperature control ability of mobile phones. Therefore, we hope that in the future, the industry can also use high specification heat dissipation outside the mobile phone chipset to further improve the comprehensive use experience of mobile phones.

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