Samsung announces the cause of its smartphone incidents
25 January 2017
700 researchers examined every aspect of the Galaxy Note7 to conclude that the batteries were the reason behind its smartphones failure.
Investigations were completed by Samsung and three independent industry organisations. All aspects were investigated, including hardware, software and related processes.
Based on a detailed analysis of the affected batteries, both Battery A from the 1st recall and Battery B from 2nd recall, Samsung identified separate factors that originated in and were specific to the two different batteries.
Testing of Battery A revealed the negative electrode was deflected in the upper-right corner of the battery. This negative electrode was incorrectly located in the curve, leading to abnormalities.
Battery B testing highlighted high welding burrs on the positive electrode, resulting in the penetration of the insulation tape and separator which then caused direct contact between the positive tab with the negative electrode.
As an additional contributing factor, a number of batteries were missing insulation tape.
There may also be a number of contributing factors relating to battery assembly/manufacturing and design that when combined led to the failure of the Note7 in the field.
Following the investigation, Samsung developed strict quality assurance protocols across its entire development process in an effort to promote its commitment to safety.
The new and enhanced safety measures are as follows:
• Samsung’s enhanced 8-Point Battery Safety Check addresses safety from the component level to the assembly and shipment of devices. Included in the check are enhanced tests (Durability Test, Visual Inspection, X-Ray Test, Disassembling Test and ?OCT Test), as well as newly applied measures (Charge and Discharge Test, TVOC Test and Accelerated Usage Test).
• Samsung’s enhanced multi-layer safety measures protocol will implement strict safety standards on every element of the company’s devices including the overall design and materials used, device hardware strength and capabilities, and improved software algorithms for safer battery charging temperature, current and duration.
• Samsung formed a battery advisory group of external advisers made up of academic and research experts to ensure the company maintains a clear and objective perspective on battery safety and innovation.
Video courtesy of Samsung Newsroom.