Microwave signal jammer

SEOUL, South Korea (AP) — Samsung Electronics said Monday that tests of more than 200,000 Galaxy Note 7 smartphones found defects in two sets of batteries from two different manufacturers that made the devices prone to catch fire. Samsung’s mobile division president, Koh Dong-jin, ruled out any problems with other aspects of the Note 7, either in its hardware or its software. He said Samsung would use what it learned from its investigations to improve lithium ion battery safety for the industry, though analysts questioned if the company had really gotten to the heart of the problem. Samsung discontinued the Note 7 just two months after it was launched on Aug. 2, in one of its worst product fiascos ever. The company said 700 hundred researchers and engineers tested more than 200,000 devices and more than 30,000 batteries and replicated what happened with the Note 7 phones trying to pin down why some of the phones were overheating. U.S. companies UL and Exponent also examined the batteries supplied by South Korea-based Samsung SDI and China-based Amperex Technology Ltd., or ATL. The German company TUV Rheinland analyzed the Note 7 supply chain as part of the investigation, Samsung said. The Galaxy Note 7 featured one of the biggest battery capacities so far for smartphones at 3,500 mAh, or milliampere hour, which gave it the highest energy density of all Samsung’s devices. However, Koh said Samsung and the outside inspectors found no evidence that the high energy density alone had made the phones prone to overheating. Rechargeable lithium batteries are more susceptible to overheating than other types of batteries if they are exposed to high temperatures, are damaged or have manufacturing flaws. A highly technical explanation of Note 7 problems boiled down to the relatively large battery cells not fitting well into their pouches, with not enough insulating material inside. In batteries by one manufacturer — likely Samsung SDI — used in the phones in the initial Note 7 recall, inspectors found damage to their upper corners. That, combined with thin separators and high energy density, caused the phones to overheat. The cell-pouch design of the battery did not include enough room to safely accommodate its electrodes — another flaw. It was unclear to what extent the battery maker was responsible for those problems: Samsung said only that it had provided “targets” for the batteries. “We suggested that the Note 7 has innovations and a compact design and a 3500 mAh (battery) but we did not know how to make the separators within (the battery) or how many millimeters thick they should be,” Koh told reporters. That may suggest a breakdown both in communication between Samsung and its suppliers and in quality control and testing. In other batches of batteries from a second manufacturer, presumably ATL, the researchers found welding defects and a lack of protective tape in some battery cells. Patrick Moorhead, president of Moor Insights & Strategy, said the odds of two different suppliers having issues with the same phone are extremely low. Though Samsung faulted the batteries from its suppliers, it said in a statement “we provided the target for the battery specifications for the innovative Note 7, and we are taking responsibility for our failure to ultimately identify and verify the issues arising out of battery design and manufacturing.” Koh said Samsung would treat the event as a “chance to strengthen the safety of lithium-ion batteries for the entire industry, not only us.” Analysts said the root cause of the fires remains unclear. “Samsung said the weaknesses could make the phone prone to catch fire. That I understand but what did trigger fires in such conditions? Did they discuss if there is another cause? No,” said Park Chul Wan, a former director of the next generation battery research center at the state-owned Korea Electronics Technology Institute. Recalls of the Note 7s began in September after reports emerged that some of the phones were overheating and catching fire. At the time, Samsung blamed a flaw in batteries from one of its two suppliers, without saying which manufacturer was to blame. In October, Samsung dropped the phone for good after new Note 7s with different batteries issued as replacements also were found to be catching fire. It estimates the problems will cost it at least $5.3 billion through early 2017. The company has recalled 3.06 million Note 7 phones. About 4 percent, or 120,000 units, of the recalled Galaxy Note 7, are still not returned. ___ Follow Youkyung Lee: www.twitter.com/YKLeeAP and https://apnews.com/search/youkyung%20lee Credit: Samsung

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