18650 lithium ion battery or polymer lithium ion battery: which is safer?

18650 lithium ion battery or polymer lithium ion battery: which one is safer? It seems that the general public opinion is: polymer lithium-ion batteries are safer and are said to never explode. According to my understanding, the claim that the polymer lithium ion battery is safer is mainly from the manufacturer of the Taobao copycat mobile power supply, which uses the polymer lithium ion battery as a selling point to attack products that use 18650 batteries. Everyone can use 'battery explosion' as a key word, Du Niangzhi, the relevant important news is related to mobile phones, and there are no models with non-polymer lithium ion batteries for mobile phones today. Therefore, polymer lithium The claim that ion batteries are safer than 18650 lithium-ion batteries 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-ion batteries. Of course, the polymer lithium-ion battery has its magical and 18650 (cylindrical) lithium-ion battery's completely irreplaceable advantage: the square and flat shape, which makes it a great use in thin and light portable electronic devices, except for the mobile phones that everyone highly depends on. Polymer lithium-ion batteries are also used in thin notebooks. No matter its security is high or low, as long as we can't do without the mobile phone, it is in your hand or in your trouser pocket. Fortunately, the current star models of mainstream mobile phone brands almost all 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. Turning back to talk about the 18650 lithium-ion battery, this '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 and notebook batteries, the 18650 has always been the main role. The large-scale use of Tesla electric vehicles has enhanced the high-safety image of this battery. The 18650 lithium-ion battery has mature technology, good consistency and high capacity density. It has the advantages that polymer lithium-ion batteries cannot be replaced 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 is important to the quality control of the manufacturer, not to whether it is a polymer or a general lithium-ion battery. By the way, to correct a widely accepted false statement: polymer lithium-ion batteries do not mean lighter and thinner. Lightness or thickness has always been closely related to energy density. No matter whether the battery is cylindrical or square, in the same period, the volume and weight of polymer lithium-ion batteries of the same capacity and 18650 lithium-ion batteries are not significantly different.