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It seems that the general public opinion is that polymer lithium batteries are safer and are said to never explode. The author said "haha"!

According to the author's understanding, the claim that polymer lithium batteries are safer is mainly from the manufacturers of Taobao copycat mobile power sources, who use polymer lithium batteries as a selling point to attack products that use 18650 batteries.

Everyone can use "battery explosion" as the key word, Du Niangzhi, the main news related to mobile phones, but now mobile phones, there is no model of non-polymer lithium battery, so compared with polymer lithium battery The claim that 18650 lithium batteries are safer is untenable, and there is no claim that they will never explode. Except for a few extreme explosion cases, the bulging phenomenon is almost a common problem of polymer lithium batteries.

Of course, the polymer lithium battery has its unique and completely irreplaceable advantage of the 18650 (cylindrical) lithium battery: the square and flat shape, which makes it a great use in thin and light portable electronic devices, except for the highly dependent mobile phones and ultra-thin notebooks. Lithium polymer batteries are also used here. No matter its security is high or low, as long as we cannot do without the mobile phone, it is in your hand or in your trouser pocket. Fortunately, most of the current star models of mainstream mobile phone brands use Japanese and Korean batteries, all from major international manufacturers, and the overall safety is very high, so you don't need to worry about it in daily use.

Back to talk about 18650 lithium battery, this kind of "old" battery that is often attacked by various cottage mobile power manufacturers, is still widely used in various electronic devices, such as mobile power. In fact, in high-end applications, such as professional imaging equipment, notebook batteries, 18650 has always been the main role, and the large-scale application of Tesla electric vehicles has enhanced the high-security image of this battery. The 18650 lithium battery has mature technology, good consistency, and high capacity density. It has advantages that polymer lithium batteries cannot replace in large-capacity hybrid applications.

So, when we need to consider the battery type in our daily life, what choice should we make? Take the mobile power supply as an example. My personal opinion is: choose products from well-known battery suppliers, such as: SANYO, Panasonic, SONY, Samsung, LG, domestic Lishen, BAK, Yangtze River, Zhuoneng, etc. also have a certain scale of strength The safety of the brand is also relatively high. The safety of the battery cell mainly lies in the quality control of the manufacturer, rather than whether it is a polymer or an ordinary lithium battery.

By the way, to correct a widely accepted false statement: polymer lithium battery does not mean that it is lighter and thinner. Lightness or thickness has always been closely related to energy density. Whether the battery is cylindrical or square, in the same period, the same capacity polymerization There is no significant difference between the volume and weight of lithium batteries and 18650 lithium batteries.