Recently, there have been many overheating and even explosions of the Samsung Galaxy Note7 mobile phone in the world. Samsung subsequently announced the recall of the new Note7 mobile phone and explained: "The company has conducted an in-depth investigation and found that there is a problem with the lithium battery installed in the mobile phone."
Since its inception, the lithium battery family has quickly occupied the handheld device market with its high performance and no memory effect.
So is the lithium battery reliable? What do you think about it? Lithium-ion batteries rely on lithium ions to move between the positive and negative electrodes to complete the conversion of chemical energy to electrical energy. It consists of a positive electrode, a negative electrode, a separator, and an electrolyte.
When the battery is charged, lithium ions are generated on the positive electrode of the battery, and the generated lithium ions move to the negative electrode through the electrolyte. The carbon as the negative electrode has a layered structure, and it has many micropores. The lithium ions reaching the negative electrode are embedded in the micropores of the carbon layer, and the more lithium ions are embedded, the higher the charging capacity. By the same token, when the battery is discharged (ie, the process we use the battery), the lithium ions embedded in the carbon layer of the negative electrode come out and move back to the positive electrode. The more lithium ions return to the positive electrode, the higher the discharge capacity. What we usually call battery capacity refers to the discharge capacity. Therefore, it has become the representative of high-performance batteries.
Lithium is an extremely active metal that oxidizes and burns when exposed to air, and explodes when exposed to water. Therefore, in the production process of the lithium ion battery, in order to avoid short circuit between the positive and negative electrodes through the electrolyte, it is necessary to divide the positive and negative electrodes with a separator. Battery manufacturers use thinner diaphragms to increase the energy density of batteries without increasing the volume to store more energy in a limited volume. The reduction in thickness increases the difficulty in producing the separator, which is liable to cause production defects, so that the separator cannot effectively isolate the positive and negative electrodes. A short circuit or explosion of the battery can occur after an improper charging method causes overheating or is leaked by a physical shock.
How to prevent battery explosion:
1. Select products with qualified quality. When purchasing mobile phone chargers and batteries, be sure to select qualified products from regular manufacturers. Do not buy cheap products and purchase products with unqualified electrical performance.
2. Avoid damp or water ingress, the circuit is most likely to cause short circuit when it encounters water, resulting in an accident. If there is moisture ingress, dry it first or blow it off with a hair dryer.
3. Avoid physical shock to the mobile phone. Once you are exposed to physical shock, you must first observe whether there is continuous heating.
4. Remember to unplug the power cord when charging is finished. This will effectively prevent the power cord from causing a fire.
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