Shulou(Shulou.com)11/24 Report--

CTOnews.com, Oct. 14 (Xinhua)-- Arun Maini, a blogger on the oil pipeline technology channel Mrwhosetheboss, discovered last month that among his collection of more than 600 smartphones, the battery of Galaxy Note 8 had a drum condition, which caused the phone to crack. He later discovered that the batteries of his Galaxy S6 and S10 were also bulging.

When Arun Maini posted the news on Twitter, some reviewers said their Samsung phone batteries also had drum bags. Later, Maini posted the relevant video on YouTube, and after the video was released, more people said they had found the same thing.

This is not the first time Samsung has encountered battery problems after its Galaxy Note 7 stopped production because of a battery fire.

It is reported that Maini currently counts eight affected phones, all of which are Samsung phones. Although this means that only 1% of his mobile phone collection is affected, it is still very worrying that billions of people carry smartphones in their pockets every day.

Maini puts all his phones on the shelf and holds them upright with special 3D printing clips. There is no thermometer in his room, but Maini estimates the temperature is usually around 22 degrees Celsius, and he doesn't think the temperature has anything to do with battery expansion.

Arthur Shi, a senior technical writer at iFixit, said in an interview that when the electrolyte material in the battery (usually a liquid) begins to decompose and then turns into a gas, it expands. For lithium-ion batteries, they can be damaged if they are discharged to the point where there is almost no charge, he said.

Arthur Shi said that many iFixit phones also have battery drum bags, including Samsung and Apple phones, as to why this seems to happen on more Samsung phones, there is still a lot of research work. According to Shi, iPhone batteries tend to have smaller drum packs, and the older iPhone's battery capacity is significantly smaller than Samsung's. "capacity is also a factor affecting the degree of battery expansion," he said. "

Kelsey Hatzell, an assistant professor of mechanical and aerospace engineering at Princeton University, said the problem could also be caused by manufacturing defects. "when a metal part comes into contact with the material inside the battery and any metal residue is transferred to the battery during the manufacturing process, this is the cause of most or a considerable number of battery failures," she said in an interview. I expect it has something to do with the battery manufacturer. "

CTOnews.com learned that Samsung spokesman Chris Langlois told The Verge that Samsung was "aware of this" and was "studying further technical assessments" and encouraged customers who had questions about their Samsung devices to contact their local Samsung customer service representatives.

If you find that the phone's battery is expanding, don't panic, Arthur Shi said. "the drum bag itself is not dangerous, it's a safety mechanism to curb volatile gases. The battery actually expands slightly every time you charge, and the phone manufacturer has established specific tolerances in the battery well to take this into account."

The danger is to charge a battery that is already bulging, says Arthur Shi. "when you charge it, it will cause the electrolyte to decompose even more. Then the battery may expand more and eventually burst, and the heat generated may lead to thermal events."

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