Apple revealed that the iPhone Duo hinge also incorporates heat dissipation design. (Photo/Reuters)
Apple's first foldable phone, iPhone Duo, will be available for pre-order tomorrow (16th) and will be officially launched on October 23rd, with prices ranging from 74,900 yuan to 118,900 yuan. In addition to being able to unfold and transform into a large screen, iPhone Duo actually also has a cooling technology hidden inside. Apple cleverly allows the hinge that is originally responsible for opening and closing to also help dissipate heat from the phone, trying to solve the problem of easy accumulation of heat in folded phones.
Although foldable mobile phones can be unfolded and transformed into a large screen, heat dissipation has always been a major design challenge. When the phone is unfolded, the body has a larger surface area for heat dissipation. Once closed, the two sides of the phone are stacked together like a sandwich, and the area for heat dissipation is also reduced. If you play games, record videos, or perform high-load work for a long time, heat will accumulate more easily, affecting performance.
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Although foldable mobile phones can be unfolded and transformed into a large screen, they have inherent limitations in heat dissipation. When the phone is unfolded, the body has a larger area for heat dissipation. Once closed, the two sides of the phone are stacked together like a sandwich, and the area for heat dissipation is reduced. If you play games, shoot videos, or perform high-load tasks for a long time, heat will accumulate more easily, affecting performance.
Apple said that heat dissipation is one of the most technically difficult aspects of the iPhone Duo. (Photo/Reuters)
The hinge not only folds, but also helps cool down the phone
Apple's engineering team revealed to foreign media that in order to solve the iPhone Duo's heat dissipation problem, Apple not only adopted a floating vapor chamber design, but also added a "flexible graphite heat pipe" inside the hinge to allow heat to be transferred between the two sides of the phone and increase the available heat dissipation area.
In the past, the hinge of folding mobile phones was mainly responsible for opening and closing the phone smoothly, but Apple has added a new task to the hinge this time, which is to help transfer heat. When the chip generates a large amount of heat energy, part of the heat can be transferred to the other side of the fuselage through the graphite heat pipe to avoid excessive concentration of heat.
However, this design cannot be achieved by adding a heat pipe. Apple admits that this is one of the most technically challenging aspects of the iPhone Duo, because the heat pipe must be bent repeatedly along the shaft. Not only must it maintain good thermal conductivity, but it must also ensure that it will not be easily damaged after long-term use. Therefore, Apple’s thermal and mechanical engineering teams must work together to develop both thermal efficiency and durability.
Floating vapor chamber is thinner than iPhone 18 Pro
In addition to shaft heat dissipation, iPhone Duo is also equipped with a specially designed ultra-thin vapor chamber, which is thinner than the version used in the iPhone 18 Pro series, and adopts a floating structure, allowing the phone to effectively manage the heat generated by the chip while pursuing a thin and light design.
Another key to heat dissipation is the packaging design of the A20 Pro chip. In the past, iPhones usually stacked DRAM memory directly on top of the chip. Although this saves space, it also limits heat conduction. This time, the A20 Pro adopts a new WMCM packaging technology, which moves the DRAM next to the chip so that the generated heat can be conducted more directly to the vapor chamber to improve heat dissipation efficiency.
Overall, Apple is not simply adding heat dissipation materials this time, but is comprehensively rethinking the heat dissipation design from chip packaging, vapor chambers to folding shafts, hoping that even if the iPhone Duo has a slim body, it can still maintain the performance that a flagship phone should have. However, the actual effectiveness of this shaft cooling technology remains to be verified by actual testing.
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