Samsung announces cause of Galaxy Note7 incidents
Samsung Electronics, along with independent industry expert organizations, has announced during a press conference the reasons why the Galaxy Note7 smartphone catches fire.
According to Samsung, they have utilized over 700 engineers, 200K devices, and 30K batteries, as well as performed repeated device charge and discharge test to replicate the Galaxy Note7 incidents experienced by its customers.
The investigation involves the two batteries manufactured by two different companies: Battery A and Battery B. According to the findings by Samsung Electronics and independent industry groups UL, Exponent and TUV Rheinland, defects were found in the manufacturing of the two batteries.
For Battery A, an internal cell faulting and thermal failure occurred due to the tight cell pouch design that didn’t have enough room for the electrodes. This caused the electrodes to bend at the upper corners, compromising its integrity, which led to an internal short circuit.
For Battery B, it used a different cell pouch design with enough room for the electrodes. However, a new manufacturing flaw occurred (probably in its haste to replace Company A battery), this time in the electrode tab welding. Investigators found that the welding spots were sharp and relatively tall enough to bridge the distance between the positive and negative electrodes. In addition, they also found missing insulation tapes in one of the electrode tabs which increases the chances of an internal short circuit.
Based on what Samsung has learned from the investigation, the company has “implemented a broad range of internal quality and safety processes to further enhance product safety including additional protocols such as the multi-layer safety measures and 8-Point Battery Safety Check. Samsung also formed a Battery Advisory Group of external advisers, academic and research experts to ensure it maintains a clear and objective perspective on battery safety and innovation.”
DJ Koh, President of Mobile Communications Business, Samsung Electronics, has also expressed his sincere apology and gratitude to Galaxy Note7 customers, mobile operators, retail and distribution partners and business partners for their patience and continued support.
“Today, more than ever, we are committed to earning the trust of our customers through innovation that redefines what is possible in safety, and as a gateway to unlimited possibilities and incredible new experiences,” Koh said.