Galaxy Note 7 fires caused by two separate battery issues — Samsung

Allan Goodman
January 23, 2017

Provides detailed overview of investigation.

Soon after the Galaxy Note 7 launched, videos were posted on social media from owners around the world of handsets appearing to overheat and burst into flames. He also apologized to the Note 7 customers but thanked them for their support and patience.

August 5, 2016: the Galaxy Note7 pre orders commenced in Australia. Two weeks later, on September 2, Samsung announced a global product replacement program. Some replacements exhibited similar issues, and the phone was discontinued on 11 October.

The results of that testing indicated the battery itself was the source of the problem, not the handset. These were subjected to repeated charge and discharge testing. It also means putting the cell through tests involving extreme temperatures and generally pushing the battery to the limit to see how it responds.

Meanwhile, no factor was found in the logistics and assembly processes that damage battery safety, according to the TUV Rheindland's investigations into factories in South Korea, China and Vietnam. These layers are rolled in to what is called a jelly roll. The positive and negative electrodes were coming into contact with each other as a result of several different faults, in two different types of batteries. More specifically, the upper-right corner, which could come with abnormalities.

Samsung ended its press conference with the promise that it has taken corrective actions to "ensure this never happens again".

Battery B had melted copper on the negative electrode area facing the positive tab, indicating a short circuit had occurred in that location.

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The company said that its investigation, as well as three independent investigations found the batteries to be the cause of the problem.

In fact, Samsung added that a number of batteries were simply missing the aforementioned insulation tape. Team also tested more than 30,000 batteries in the lab.

During their testing, Samsung built a custom charging and discharging facility to help replicate the failure. The created group for this project tested all aspects of the smartphone, including its fast-charging battery system, software, water-resistance as well as its iris scanner. What's more, some critics were not pleased with the way Samsung dealt with the crisis, citing a lack of transparency and a too-passive recall.

This more or less matches what The Wall Street Journal reported last week.

Holger Kunz, the German company's executive vice president, said its supply-chain analysis showed no specific defection of weakness, concern or obvious danger affecting battery safety integrity.

Keeping in view its Galaxy Note 7 debacle and its latest findings, Samsung has chose to implement additional safety protocols and an 8-Point Battery Safety Check routine to ensure battery safety.

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