SMARTPHONE. just Two months after the launch of its smartphone flagship, the Galaxy Note 7, Samsung has to suspend the marketing. Question : a dangerous tendency to ignite ! Everything had started out so well… When the Korean giant has, in August 2016, this new "flagship" (flagship product) to the press, the optimistic. Journalists of the specialized press show for the most part very enthusiastic about the performance and the technology onboard this new smartphone top-of-the-line, such as the scanner of an iris used to unlock the screen. Ourselves to Sciences et Avenir had the opportunity to take in hand and appreciate the quality of photos and videos, as well as the fluidity and smoothness of the handwriting with the pen stowed in the thickness of the device. In short, the Galaxy Note 7 was appointed to be crowned the title of best smartphone of the moment. And this before even its large american competitor Apple, the leader on this segment the top-of-the-line, ad a few weeks later the release of his new iPhone 7.
the battery of The Samsung Galaxy Note 7 is incriminated
And then, crash ! Hardly in the hands of the first customers, here’s this icon of geeks is subject to a strange phenomenon of spontaneous combustion. Worse, the Note 7 explodes. Here, it ignited a Jeep, a house, and when he does not make a hole in the carpet of a plane from the american company Southwest. In Florida, it explodes in the front pocket of the shorts of the young Jonathan Strobel, who had to imagine the worst for a few seconds. Consecration ultimate Samsung would be well-placed : in the video game GTA 5, the Galaxy Note 7 becomes a powerful explosive that can be bought… in a weapons store.
Samsung responds very quickly, organizing a recall massif of its phones have already been distributed around the world, is 2.5 million units. And it is the culprit : the battery. The explosions of lithium-ion batteries are not new, and not so rare as this. Thus, during the summer of 2016, a few Hoverboards – these new skateboards are parties in smoke. Laptops, but also iPhones from Apple and even other models of Samsung have already flamed by the past. Without forgetting this electric car Model S of the american manufacturer Tesla that caught fire during a test on a drive from Biarritz, also in August 2016.
The causes of these incidents are well known : the lithium-ion batteries consist of a stack of "stacks", each composed of two electrodes (cathode and anode) remote by a separator (electrolyte). It has the role of preventing the contact between the two electrodes to avoid short-circuit while allowing the lithium ions from one electrode to the other. Result : during charging, these ions migrate from the cathode to the anode so that they take the opposite path during the use of the smartphone. And so on for each cycle of charge and discharge.
A short-circuit pest to the Galaxy Note 7 Samsung
Two phenomena may lead to the explosion of a battery. The first is the short-circuit : two electrodes touch each other, in particular, when the separator is damaged. The result is a warm up important. However, the battery is enclosed in its casing of metal, which itself confined in the housing of the phone, the heat was difficult to dissipate. It is the runaway. The temperature rises to ignite the electrolyte and then, the gas discharged from the combustion cannot escape, the pressure in the battery will increase significantly up to cause the explosion of the phone. The second phenomenon is the overload. It occurs if the electronic device is loaded to cut off the load when the battery is at 100% is defective. The battery continuing to charge beyond its capacity, the lithium accumulates on the side of the anode and begins to form dendrites, types of diverticula that will pierce the separator and move toward the cathode, creating a short-circuit.
to this day, these two phenomena remain the most probable hypotheses to explain the explosion of the Galaxy Note 7. But it will have to wait for the findings of the survey conducted by Samsung in connection with the u.s. authorities to confirm it. This industrial accident is expected to cost several billion euros to the Korean manufacturer, who wished to yet consolidate its position as number 1 in the world… and enjoy without doubt the iPhone 7 to its competitor Apple who did not ask for much !
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