galaxy note 7 recall shows challenges of stronger batteries - li ion battery cell

SEOUL, South Korea
Samsung recall 2.
The 5 million Galaxy Note 7 phone may have been caused by a subtle manufacturing error after dozens of fires and explosions, but it highlights electronics manufacturers running around to package more battery power into thinner and thinner phones for faster release dates.
The recall was announced on Tuesday.
2. Samsung confirmed dozens of cases in which the Note 7 battery caught fire or exploded, mostly when charged.
The company plans to carry out software updates that limit the battery's charging capacity to 60 cents to help minimize the risk of overheating.
But it urged owners to turn off their phones from Monday, before replacing them. U. S.
The security regulator made an official recall on Thursday, saying Samsung's voluntary action was not enough.
Despite Samsung's promise to replace devices, the United StatesS.
The US Consumer Product Safety Commission said,S.
Customers will be eligible for a refund if they choose.
It is expected to be replaced at the store next Wednesday.
The moon is well received on August. due to its speed, the new software function,not least —
It is estimated that it will last nine hours between the two charges.
But all of this electricity comes at a cost: the user starts to report that the phone is on fire or exploding, and in one case burns the SUV that stays in it.
American aviation authoritiesS.
Australia and Europe urge passengers not to use Note 7 or charge Note 7 while flying, or to put it in checked baggage.
Canada officially announced the recall on Monday. Koh Dong-
Samsung Mobile President Kim said in a recall on Tuesday.
2 A survey shows that a "minor error" occurred during the manufacturing of the faulty battery in Note 7, which is difficult to identify.
The end of the bag-
He explained that the molded battery has some defects that increase the possibility of pressure or overheating.
This manufacturing error is unthinkable for top-
Park Chul Wan, former director of the National next generation battery research center, said notch battery manufacturers with adequate quality control
Korea Institute of Electronic Technology.
Samsung and other experts should look for factors other than the battery that could cause overheating, he said.
"If Koh's argument is correct, it makes Samsung SDI the third --
Rate the company, "Park.
"But it doesn't seem like a simple battery problem.
"Time is also a factor in marketing and making mobile phones.
On 2015, Samsung raised its new Galaxy Note model from August to September, seeking to make a difference in Apple's iPhone upgrade in September.
Supply couldn't keep up with Note 7 demand until the battery explosion problem occurred.
Samsung did not recall the Note 7 sold in China, but the company declined to say which of its two battery suppliers made a faulty battery and declined to clarify that it was used in the Note 7 smartphone.
The company also declined to comment on South Korean media reports, saying it stopped using Samsung SDI, one of its two suppliers, in the Note 7. C. W.
Zhong, an analyst at Seoul Securities in Seoul, said SDI officials estimated that the battery of the Galaxy Note 7 smartphone was from SDI.
It is believed that the other 30 cents were provided by Amperex Technology Ltd. , a Chinese-
It is reported that the company is also a major supplier of iPhone batteries.
From laptops to Tesla cars to Boeing's 787, the problem with lithium batteries has been bothering everything, even though there is so much lithium.
The ion battery caught fire in a short period of time, Park said.
Batteries are everywhere in consumer electronics and are favored by manufacturers because they are lightweight and pack more energy into a small space than other power batteries.
But with so much energy stored in a very small space, combustible components are super
Thin walls make them prone to overheating if exposed to high temperature, damage or manufacturing defects.
If the separator fails, the chemical reaction is quickly out of control.
Samsung's Koh explained that this is how Note 7 happened.
"Defects in the manufacturing process cause negative and positive electrodes to gather together," he told reporters in Seoul . ".
It is not clear how Samsung found battery problems before launching Note 7.
The company confirmed that after photos of burnt phones appeared on social media, a few weeks later, the end of August, there was a delay in delivery of additional quality tests.
South Korean experts say Samsung may be too ambitious in the design of the Note 7 to affect security.
"There is no choice but to make a separator (
Between positive and negative poles)
Because of the battery capacity, it is very thin . "
Yong, a professor at Ulsan National Institute of Science and Technology, has worked for more than ten years at LG Chem, a leading lithium battery manufacturer.
Thicker separators can improve safety, but they don't necessarily prevent all overheating problems, he said. Doh Chil-
Hu en, head of state-
The battery research department of the Korea Institute of Electronic Technology said that based on the limited information provided by Samsung, he believes that efforts to increase battery power are part of the problem.
"Even if there is a small manufacturing error, it will not explode if there are enough elements to ensure safety," Doh said . ".
"This is a roundabout way to recognize weak security.
"The Note 7 phone has a powerful 3,500-hour battery, while the Galaxy S7 smartphone has a slightly smaller body than the Note 7 and a 3,000 battery.
The same is true of Note 5 launched in 2015.
Apple did not provide information about the iPhone's battery capacity, in milliamperes.
But two research firms that specialize in analyzing tech gadgets and their components say the iPhone 6 S Plus has a 2,750 mAh battery.
The size of the battery in the newly released iPhone 7 is not yet known.
The 3,500 mAh battery in Samsung Note 7 is "one of the highest capacity batteries we see in our phones, if not the highest," said Wayne Lam, an industry analyst at IHS Markit Technology.
Lin said he believes the Note 7 battery problem is caused by weak manufacturing controls rather than poor design or insecurity.
A spokeswoman for IFixit provided a similar view, and the company published a guide to the repair of electronic products.
"We don't think any internal design changes in Note 7 are responsible for the exploding battery --
It is more likely that it is just a manufacturing defect, "Kai of IFixit-
Kekelap said in an email.
Apple has adjusted its own hardware and software to make the iphone use power more effectively, while Samsung has increased the capacity of the phone's battery.
This can be done by adjusting the components or changing the production process without increasing the size, Lam said.
"You have two different trajectories, Samsung has a higher energy density, and Apple is trying to reduce the energy density by optimizing everything else," he said . " He added that the two competitors "have been locked in this arms race for improvement and integration"upping.
When Apple and Samsung use the built-in
In terms of battery for high-end phones, Samsung's smaller South Korean rival, LG Electronics, has chosen a replaceable 3,200 mAh capacity battery for its new high-end, oversized-screen smartphone v20.
LG chose to make the phone thinner and extend the customer's battery life by replacing the battery.
"The safety of the battery is not directly related to whether the battery can be replaced," Cho Joon-
He Hong ho, head of LG Mobile business, told reporters.
"But we strive to ensure safety through prior quality control testing.