Who is better with polymer than cylindrical lithium battery

Lithium batteries use liquid electrolytes, while polymer batteries use gel electrolytes and solid electrolytes. In fact, domestic polymers cannot really be called polymers, and cannot be truly solid. It is more accurate to call them no flowable liquid. This is a digression, so I won't explain it here. 2. The packaging method and exterior polymer use aluminum-plastic film packaging, the shape can be customized at will, thick or thin, large or small. Lithium batteries are packaged in steel shells, with the most cylindrical shape, the most common being 18650, which refers to a diameter of 18mm and a height of 65mm. The shape is fixed. Can't change at will. 3. Safety The polymer has no flowing liquid inside and will not leak. When the internal temperature is high, the aluminum-plastic film shell is just flatulence or bulging and will not explode. The safety is higher than that of lithium batteries. Of course, this is not absolute. If the polymer battery's instantaneous current is large enough to cause a short circuit, the battery will ignite or explode. The Samsung mobile phone battery explosion that occurred a few years ago and the Lenovo recall of laptops due to battery defects this year are the same problems. 4. The average energy density of 18650 battery can reach about 2200mAh, so the energy density is about 500Wh/L, and the energy density of polymer batteries is close to 600Wh/L at this stage. 5. Battery cell voltage Since polymer batteries use polymer materials, they can be made into a multi-layer combination in the cell to achieve high voltage, while the nominal capacity of lithium battery cells is 3.6V. If you want to achieve high voltage in actual use, A number of batteries must be connected in series to form an ideal high-voltage working platform. 6, the price is generally more expensive than lithium batteries with the same energy polymer. But it cannot be said that this is a disadvantage of polymers. At present, in the field of consumer electronics, such as notebooks and mobile power supplies, more and more polymers are used to replace lithium batteries. In a small battery compartment, to achieve the maximum energy density in a limited space, polymers are still used. Because of the fixed shape of the lithium battery, it cannot be customized according to the customer's design. However, there is no uniform standard size for polymer batteries, which in turn has become a disadvantage in some respects. The battery used in Tesla cars is composed of more than 7000 18650 sections in series and parallel, plus a power control system. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete.