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How to bend the foldable mobile phone battery pack?

For several years, Samsung, Nokia, and even Apple have been developing foldable mobile phones, but this time, the field of foldable mobile phones has really developed, and it has begun to excite and expect people.



What can a foldable mobile phone do? Just imagine: it can be folded with the bending of the body, it is more comfortable to put in the pocket; it will not be broken when dropped from a high place, and it will bend when it is impacted, and it will not break; it is easier to store .



The problem with foldable glass For foldable phones, the biggest challenge is to make the surface glass bend; everyone thinks that the bendable glass will not break, which is a misunderstanding.



Deepak Chowdhury, vice president of the Corning division and director of the Willow glass project, emphasized that the original intention of WillowGlass foldable glass was to become a substrate material. From the current level, it is still not enough to use it to protect internal materials. The design is originally designed. It's not for this purpose.



Indeed, WillowGlass can be chemically strengthened like Corning Diamond Glass. Diamond glass is used on the screen surface of many mobile phones, tablets, and notebooks for protection purposes. Its strength is very good. Nevertheless, even if the strengthened WillowGlass glass is strong enough to allow it to be used on mobile phones and bendable, fragmentation is still an inevitable problem.



When chemists and industrial designers talk about strength, they are not talking about cracks or chipping in glass; they are actually talking about products that can withstand a drop test and suffer less damage than rigid glass, because glass can bend, which can reduce damage; but Foldable glass cannot guard against scratches, and long-term wear and tear will make the screen more likely to break.



Corning WillowGlass glass can be bent deeply, but it can also be pierced and broken.



The first bendable display may be wrapped in plastic instead of glass, but there are challenges in elasticity and durability.



Chowdhury pointed out that in the past few years, some companies have demonstrated flexible plastic displays, but they are still far from commercialization.



In fact, the smart phone industry has shifted from plastic displays to glass displays on a large scale. For example, the iPhone 5 does not use any plastic Retina display. The image of the glass display screen is sharper and clearer, and the touch should be more agile.



Glass can also better guard against the penetration of oxygen and water. Electronic products such as mobile phones can’t wait to be as far away as possible from these two things. It will cause damage to the product and aging.



If you see flexible plastic display designs, they may be reference products or conceptual designs, or early segmented model products, rather than mature, mass-market equipment.



Even if you make the display and the glass bend, there are problems with bending other internal components. How to bend the battery? What about the solution? What about the camera module? What about the NFC circuit?



LeydenEnergy’s vice president of research and development, Mark Juzkow, said that today’s smartphones use traditional lithium-ion batteries, which are quite hard, and they can last as long as possible only if they are hard and not bend.



The new battery technology is still in the early stages of research and development, and its direction is to make the battery cells thinner and flatter, and the battery has not yet come up with a solution for bendable mobile phones. First of all, the battery uses solid electrolyte to generate power, which makes the battery charging time longer; secondly, the battery energy output cannot keep the phone running for a long time.



Mark Juzkow also pointed out a possibility to put a thicker and shorter battery at one end of the device so that the phone can fold the battery without having to. There is also a way to arrange many smaller batteries along the screen, and the device can be bent through the spaces between the batteries. However, the second method has an important difficulty: the smaller the battery, the lower the charge, and it has a shorter life than the large battery.



Nonetheless, it does not mean that foldable phones will not come true. Mechanical and design engineers have been working hard to change the shape of batteries and printed circuit boards. For example, a foldable printed circuit board is commonly used in flip phones, which connect the two halves of the phone.



When contemplating a bendable mobile phone, what material is used is also a question. From a design point of view, it is not good for a mobile phone to be too soft or too hard.



FrogDesign design director Ralston said: You have a limit, you can use elastic plastic, but what about the body material after bending?



In other words, if the mobile phone is bent, can it return to its original state? Sometimes, the mobile phone is too flexible to bend too far and cannot be restored.



Ralston believes that the most important issue is the memorability of the material. If it is bent or not, how long can it stay?



From this point of view, memory and resilience are opposites. The good news is that such materials already exist, and the difficulty lies in combining all the components into functional designs.



Deepak Chowdhury, vice president of the Corning division and director of the Willow glass project, said that because glass can be rolled up and is cheaper to manufacture, this is an important benefit.



However, the lower manufacturing cost of a single component does not mean that the overall price of the product will be cheaper. Research and development, new material manufacturing processes, these are not completed overnight, bending glass is a new technology, and its price must be high.



How much do ordinary consumers have to pay for a flexible phone? Yes, this is a new thing, but after refreshing, how practical is the foldable phone compared to traditional phones? In other words, for To make the phone more comfortable in your pocket, how much are you willing to pay?



When imagining a foldable smartphone, don’t expect the phone to be bent into a circle or rolled into a roll.



Ralston, FrogDesign's creative director, said that rolling up the phone is a stupid idea. He said: Rolling up the mobile phone and then unrolling it is a departure from mobile phone usage habits. In other words, everyone takes the device out of the pocket and wants to use it immediately, rather than using it when it is spread out.



There may be a market for foldable mobile phones and other devices, but Ralston believes that products will not appear until the bendable glass and other bendable components are truly mature.



Corning Parker Chowdhury agrees with this view for one reason: the manufacturer doesn't know what it wants. Chowdhury said: We are trying to commercialize glass, but when it comes to fully functional equipment, there are different opinions on what flexibility means. In addition to the vague meaning, how manufacturers can profit from foldable phones is also a question.

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