We all waited a long time for this information. Today, Samsung unveiled the results of the teams investigating the cause of Galaxy Note 7 autoignition. Batteries of this faulty smartphone were examined by both the Samsung employees and three independent teams from external companies. The conclusion from this work is one. Not at fault here the project of the smartphone. The batteries were not able to meet the requirements posed.
In recent months they have tested all the factors that could have an impact on problems with the Galaxy Note 7. Samsung has proven its flagship both in terms of hardware and software running on it. They have also checked the whole production process. Around 700 Samsung employees has tested 200 000 pieces of Galaxy Note 7 and 30 000 batteries. After many attempts, they were able to reproduce issues reported by customers from all over the world.
Samsung has established that both types of battery used in the Galaxy Note 7 were defective.
Two independent companies manufactured batteries for Galaxy Note 7: Samsung SDI (type A) and Amperex Technology (type B). Samsung initially thought that the problem only applies to batteries manufactured by Samsung SDI. These batteries were in all the Galaxy Note 7 except models sold in China. As a result of swelling, the battery of Samsung SDI deform in the upper right corner. This led to a short circuit between the positive and negative electrodes. Furthermore, the negatively charged electrode was improperly placed inside the battery. Both these factors resulted in inappropriate behaviour during battery swelling. Leaving more space inside the smartphone would not help here.
Batteries from the Amperex Technology company were hiding their disadvantage longer. Here, the problem appeared in the upper left part of the battery, but it was a place quite distant from the charging cable. In place of the discontinuation rate of insulating tape and the separator whereby short circuit occurred between the electrodes of opposite charge. In addition, some batteries did not have insulation tape installed between the electrodes.
96% of the 3 millions sold Samsung Galaxy Note 7 units returned to the manufacturer.
Other pieces are systematically excluded from the market by updates prepared by Samsung. One of them artificially limits the capacity of the battery, minimizing the likelihood of spontaneous combustion. The second update is more rigorous, because it completely excludes the possibility of charging your smartphone. However, these are not the only steps which Samsung has taken in connection with the situation. Every electronics manufacturer draws conclusions from their mistakes. All this, so that similar incidents do not occur in the future.