Why those Samsung batteries exploded

by:CTECHi     2020-02-04
Today, lithium-ion batteries appear in a variety of technologies, from your mobile phone, laptop to aircraft and electric vehicles.
But I recalled it voluntarily.
Reports of the battery explosion on the 5 million Samsung Galaxy Note 7 smartphone have raised concerns about its safety.
Last week, the Federal Aviation Administration warned passengers not to turn on or charge during their flight-
Even put them in checked baggage.
Some international airlines have imposed similar restrictions on travel using smartphones.
The Consumer Product Safety Board recommends that consumers stop charging or using the device.
\"Here is the information you need to know about lithium batteries that may power many of your Technologies ---
Why are they on fire sometimes?
What is lithium ion battery and why is it so popular?
The lithium ion battery is a little different from the basicAA battery you use to power the TV remote.
They are rechargeable and usually built directly into the device and rely on lithium as the primary fuel.
Lithium-ion batteries are particularly popular in devices such as laptops and mobile phones, because they store energy efficiently and charge slowly.
\"You will get a lot of oomph relative to the old technique of the same size ---
It\'s usually two to four times the voltage, \"explains Stephen Hackney, a professor of materials science and engineering at Michigan University of Technology.
How do they work?
Like almost all batteries, lithium-ion batteries work by storing energy and releasing it through a controlled chemical reaction.
Two electrodes for lithium ion batteries-
The place where power can enter or leave the battery.
An electrode called an anode is filled with negatively charged ions.
Another electrode called the cathode contains ions and lithium with positive electricity.
You can think of the anode and cathode, just like the positive and negative symbols you often see on the battery.
Lithium moves from cathode to anode when you use battery--
Lithium goes back to the cathode when you charge it.
There is a separator inside to prevent contact between the anode and the cathode, as this can cause accidents such as fire and explosion.
So what is the cause of the explosion?
The reason you can inject so much energy into lithium-ion batteries is that lithium basically \"wants to react to almost anything \"---
This could lead to explosive results, Hackney said.
But he says one of the most common causes of battery explosions is errors during charging.
Inside the battery-dependent device, the software tells them how much the battery should charge and how fast it should charge.
If these schemes are correct, it can disrupt the stability of some chemicals inside the battery and cause a chain reaction, which the researchers believe may result in a fire or explosion.
Overheating can also cause an explosion, which is why your phone may pop up with a warning that needs to be cooled when it gets too hot.
Another reason may be shoddy or rough treatment by users.
If unwanted materials, such as metal scrap, are accidentally placed inside the battery when it is made, they short-circuit the battery of the battery and cause the heat to get out of control.
Therefore, if the impact causes the separator to break between the anode and the cathode, the device may be dropped.
What happened to Galaxy Note 7?
This seems to be a manufacturing problem.
The company said in a statement on its UK website that the company reported at least 35 cases of batteries assembled due to \"very rare manufacturing process errors\" in anode and cathode contact
The company decided to temporarily withdraw from the market two weeks after the launch of the phone and provide a replacement for those who have already purchased the device.
How often do these types of problems occur?
According to Hackney, the good news is that they are very rare, especially in high school.
Terminal equipment when manufacturers pay close attention to production quality.
But there are already a lot of highprofilecases.
For example, as early as 2006, Dell recalled more than 4 million laptop battery packs due to burning problems.
On 2013, the Boeing 787 Dreamliner was grounded by the FAA because of a fire caused by a lithium-ion battery used in the aircraft. And, a half-
Millions of floating skateboards were one of the most popular gifts of the last holiday season and were canceled this summer due to a lithium-ion battery explosion.
Are the regulators investigating these batteries?
The government and international organizations have already regulated lithium-ion batteries in many ways, which may be one of the reasons why we have not seen more explosions.
For example, the Transportation Department has regulations on how to safely transport batteries. Other U. S.
The regulations also require a variety of safety tests for batteries that end up with consumer goods, and the consumer goods safety board oversees many recalls involving lithium-ion battery products.
The agency is working with Samsung to formally recall the Galaxy Note 7 in the United States.
Custom message
Chat Online 编辑模式下无法使用
Chat Online inputting...