Samsung confirmed that the Note7 explosion was battery related.

After months of in-depth research and analysis, Samsung Electronics teamed up with the world's three largest independent research agencies yesterday to release the results of the Note7 investigation. The results showed that the Note7 explosion was due to problems in the design and manufacturing of the battery. Samsung Electronics also introduced a series of measures to prevent similar incidents from happening again.

Samsung Electronics confirmed that the explosion was caused by battery problems.

At yesterday's conference, DJKoh, president of Samsung Electronics Wireless, said: "From the conclusion, the reason why Galaxy Note 7 is burning is the battery. He said Samsung had conducted a careful review of Note7's hardware, software, and related processes such as assembly, quality inspection, and logistics, and eventually confirmed that it was a battery problem. "In pursuit of innovation and excellent design, we have set specifications and standards for the Galaxy Note 7 battery, and the problems in the design and manufacturing of this battery have not been discovered and confirmed before the release of Note 7. We are deeply saddened and sorry for that. "

More than 700 researchers and engineers tested more than 200,000 full-body and 30,000 batteries over several months in an effort to accurately investigate the cause of the accident and recreate the burning and damage on the market, according to Samsung Electronics.

The test team conducted charging and discharge tests on the entire Note7 machine and battery. The test results showed that there was indeed a burning phenomenon during the extensive charging and discharge experiments on the entire machine and battery. The proportion of burning damage occurred in the entire machine and battery. The same. Therefore, it is speculated that the burning loss phenomenon is caused by the battery.

There are different problems with A and B batteries

After confirming that the damage was caused by the battery, Samsung Electronics performed a more sophisticated detection and analysis of the battery. The lithium battery consists of a positive pole, a negative pole, and a separation membrane separating the positive and negative poles. These three components form a core in a winding manner. In general, the short-circuit inside the battery core occurs when the isolation membrane inside the core is burned.

A three-star precision test of a burned battery confirmed that a recalled A battery was different from a recalled B battery. According to previously published information, A and B represent batteries produced by different manufacturers. Among them, battery A is mainly due to the extrusion of the negative electrode plate, and other factors such as the position of the negative extreme error increase the possibility of combustion loss; The problem with battery B is the melting of copper foil. In addition, some batteries were found not to use insulating tape. The Chinese, as the second recall, used B batteries.

Samsung tested a number of features.

In addition to batteries, during the investigation, Samsung Electronics adopted an attitude of all possibilities and conducted a comprehensive detection and analysis of various assumptions about the cause of burning and loss.

In order to test the impact of fast charging, changes in the status of Wired charging and wireless charging when fast charging is enabled and turned off. The current and voltage of fast charging are tested repeatedly. In order to find out whether it is the influence of waterproof function, the charging and discharge experiments were repeatedly done in the state with and without the rear shell. In order to find out whether it is the effect of Iris recognition function, the change of electric flow when Iris recognition function is enabled was carefully observed. In order to test whether it is the influence of the new charger USB Type C, an electrostatic test of more than 4,000 volts was performed on the USB port; In order to find out whether there is current overload in the abnormal running of software, experiments such as current consumption in the abnormal running state of software are carried out. In the end, in all the above tests, there was no correlation between the anomaly and the burning phenomenon.

In addition, in addition to the product itself, Samsung Electronics also conducted a comprehensive investigation of all parts verification, production, logistics and other process links. The company examined the whole process of production and logistics from battery storage to the factory. At the same time, from the logistics point of view, it analyzed various factors such as product packaging, handling, and warehousing that may affect the state of the battery and the entire machine. The survey showed no correlation between the anomaly and the burning phenomenon.

At the same time, leading third-party institutions such as the US Insurance Industry Laboratory(UL), Exponent Laboratory, and Rhein TUV Group in Germany have also been commissioned by Samsung to conduct an objective, impartial, and independent investigation into the possibility of the Note7 incident.

The company will introduce targeted safeguards

In response to the Note7 incident, Samsung has developed "eight battery safety inspection measures" to ensure that batteries are safe and reliable. The "8 Battery Safety Inspection Measures" include safety inspection, battery appearance inspection, X-ray inspection, core dismantling inspection, TVOC inspection, ΔOCV measurement, charging and discharging inspection, and user safety inspection under the user's use scenario.

In addition, Samsung has adopted a multi-layer safety protocol for product planning. The "Multilayer Security Measures Agreement" will implement strict safety standards for each part of the device, including the overall design and materials used, hardware strength and size, and new software algorithms. At the same time, it will enhance the safety of battery charging temperature, charging current and charging duration.

In addition, Samsung has formed a "component professional team" to design, verify and manage the core components. At the same time, in order to be able to objectively assess security issues, Samsung has formed expert consultants from the academic community and industry.

"Innovation is Samsung's DNA," said Wang Tong, president of product strategy and research and development at Samsung Electronics Greater China. Under the premise of ensuring user safety and product quality, we will not stop innovating. As the largest foreign-invested company in China, Samsung will study Chinese consumers 'preferences and usage habits, and continue to develop products that satisfy Chinese consumers' preferences. "

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