Samsung has had nothing but problems since the Galaxy Note 7 launched in September. Battery problems began happening not long after launch, starting out with just a few small reports before they got fairly widespread. Samsung eventually recalled the handsets and started selling new Galaxy Note 7’s with a different battery supplier. Unfortunately, the phone was still running into the same problem with battery defects even after that.
And so, Samsung began a worldwide recall of the Galaxy Note 7, completely discontinuing the phone. But, there were still so many unanswered questions as to why it happened. Truth be told, Samsung had no idea why the Galaxy Note 7 was exploding, but after months of research and analysis, they finally have some answers.
In a press conference, Samsung revealed that the problems with the first battery was because the battery casing was too small, causing damage to the negative electrode, and thus, causing a thermal discharge.
The second battery had the same problem — a thermal discharge — but was because of a different reason: high welding burrs on the positive electrode. These burrs would penetrate through the insulation tape as well as the separator, which caused direct contact between the positive tab and the negative electrode, causing — you guessed it — a thermal discharge.
You can see a full, detailed infographic of the problem here:
Samsung says they’ve obtained 96% of the recalled Galaxy Note 7’s. They’ve got 4% more to go, hoping for full cooperation so that they can retrieve every Galaxy Note 7 sold.
The Korean tech giant says the problem shouldn’t happen again. In fact, Samsung has developed a number of internal quality steps to ensure battery safety. This includes an 8-point check to put the batteries made through extreme testing. Not only that, but they’re focusing heavily on improving battery design safety standards and even went as far as forming a Battery Advisory Group of external advisers, academic and research experts to hopefully help Samsung keep a clear perspective in future battery design.