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Today, lithium batteries have been solved in electronic devices, including smartphones, laptops, electric vehicles, and even a large number of lithium batteries, but recent Samsung Electronics Galaxynote7 flagship mobile phone overheating and explosion events, making consumers Examination of lithium batteries. According to the US media, last week, the US Federal Authority issued a consumer warning, it is recommended not to open the Note7 mobile phone or charging on the plane, or even don't put it in the checked baggage. Many international companies have also developed similar limitations.
In addition, the US Consumer Product Safety Commission has also issued suggestions and stops charging NOTE7 mobile phone. Note7's serious event, it is necessary to let us reach some knowledge of lithium batteries, especially why it happens or explodes. It's time to tell you what is lithium battery, why is Samsung Note7 exploded what is the lithium battery so popular? Lithium battery technology and the No.
5, seven batteries, such as in the TV remote control), etc., the lithium battery can be repeatedly charged, and the lithium battery needs to rely on the lithium battery in the electronic device. To provide electrical energy.
Since the lithium battery can store electrical energy efficiently, it can slow discharge, so the lithium battery is very popular battery, which is used in laptops, smartphones and other fields. Stephenhackney, Professor, Materials, Michigan University of Technology, said that compared with other old battery technology, the lithium battery can store two to four times. How does a lithium battery work? Like all batteries, lithium batteries first need to store electrical energy, and then gradually release electrical energy by controlled chemical reaction.
One lithium battery has two electrodes, that is, the power capable of entering or leaving the battery. These two electrodes are called anodes and cathodes, respectively. Popular point, consumers can regard the two electrodes as the plus or minus sign on ordinary batteries.
When discharged using a lithium battery, the lithium ion moves from the cathode to the anode, and when charging, the lithium ion moves from the anode to the cathode. Separate the anode material and the cathode material in the interior of the lithium battery. If two materials are in contact, it will trigger a combustion or explosion.
How is the explosion generated? The above professor introduced that such a multi-electric energy can be stored in a lithium battery because lithium is an active material "almost and any material.". This feature will cause explosion.
This professor said that the most common cause of the lithium battery is the mistake during the charging process. In electronic devices using lithium batteries, there is often related software to set the power of lithium batteries, and charging speed. If an error occurs, the compound in the battery will be unstable, and a researcher is called "thermal out-of control", which will cause burning or explosion.
Lithium battery temperature is too high, will also cause explosion. Therefore, some smartphones will actively alarm when the battery temperature is too high, prompting users to cool down. Another reason for overheating and explosion occurs during the manufacturing process, or the carelessness of users.
If there is no need for material (such as a small iron piece) during the battery manufacturing process, this will cause a battery short circuit, causing thermal out of control. In addition, the user's electronic equipment will cause problems with the isolation materials of the anode and cathodes in the lithium battery, resulting in overheating or explosion. What happened to NOTE7 battery? From the current point of view, it should be manufacturing problems.
Before Samsung Electronics announced that due to the "very rare manufacturing process error", at least 35 Note7 mobile phone lithium batteries in the world, it is reported that the craft error known as Samsung will make the anode and cathode. Note7 has just been listed for two weeks, but Samsung Electronics have decided to recall the product and replace new mobile phones to the consumers purchased. Is the lithium battery overheating often appears? Professor Stephenhackney, Michigan University of Technology gives a good news.
He said that lithium batteries are not common. Especially in high-end electronic devices, as long as the manufacturer is slightly paying attention to quality control, there will be such problems such as crafts. However, in history, there have been many lithium battery products recall events.
For example, in 2006, Dell recalled a laptop with a battery overheating problem. In 2013, the Boeing 787 passenger plane manufactured by Boeing, US Boeing was forced to suspend flight, because the report showed that there is a problem that the lithium battery on the plane is easy to overheat. In addition, this summer, US manufacturers also recalled more than 500,000 suspended skates (the most popular gifts last year), mainly lithium batteries overheating and explosion.
Is the regulatory agency investigating the battery overheating? At present, governments and international organizations have adopted many ways to request the safety and quality of lithium batteries. This is also a reason for lithium battery overheating or explosion. For example, the US Department of Transport has strict regulations in how to safely transport lithium batteries.
Many regulators also require a rigorous safety test in the lithium battery in consumer electronics. The US Consumer Product Safety Commission has organized multiple battery recalls in the past. At present, the agency is also working with Samsung Electronics to conduct Note7 recalls in the United States.
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