Is the power bank a good lithium battery or a polymer?

Advantages of polymer lithium battery 1. The working voltage of single battery is as high as 3.6v~3.8v, which is much higher than the 1.2V voltage of nickel-hydrogen and nickel-cadmium batteries. The capacity density is large, and its capacity density is 1.5 to 2.5 times or higher than that of nickel-hydrogen batteries or nickel-cadmium batteries. The self-discharge is small, and its capacity loss is also small after being left for a long time. Long life, its cycle life can reach more than 500 times in normal use. 2. There is no memory effect, it is not necessary to empty the remaining power before charging, which is convenient to use. Good safety performance The polymer lithium battery adopts aluminum-plastic soft packaging in structure, which is different from the metal shell of the liquid battery. Once a safety hazard occurs, the liquid battery is easy to explode, while the polymer battery will only blow up at best. The thickness is small, it can be made thinner and ultra-thin, and the battery can be assembled into a credit card. Generally, liquid lithium batteries use the method of customizing the shell first, and then plugging the positive and negative materials. The thickness is below 3.6mm and there is a technical bottleneck. Polymer batteries do not have this problem. The thickness can be below 1mm, which is in line with the current demand for mobile phones. . 3. The battery with light weight and polymer electrolyte does not need a metal shell as a protective outer packaging. The weight of the polymer battery is 40% lighter than the steel shell lithium battery of the same capacity specification, and 20% lighter than the aluminum shell battery. Large-capacity polymer batteries have a capacity of 10-15% higher than steel-shell batteries of the same size and 5-10% higher than aluminum-shell batteries. They have become the first choice for color-screen mobile phones and MMS mobile phones. Most of them use polymer batteries. 4. Small internal resistance. The internal resistance of polymer batteries is smaller than that of ordinary liquid batteries. At present, the internal resistance of domestic polymer batteries can even be below 35m, which greatly reduces the self-consumption of the battery and prolongs the standby time of the mobile phone. In time, it can fully meet the international standards. This kind of polymer lithium battery that supports large discharge current is an ideal choice for remote control models, and it has become the most promising product to replace nickel-hydrogen batteries. 5. The shape can be customized. The manufacturer is not limited to the standard shape, and can be economically made into a suitable size. Polymer batteries can add or reduce the thickness of battery cells according to customer needs, and develop new battery cell models. They are cheap and have a short mold-opening cycle. Some can even be tailored to the shape of the mobile phone to make full use of the battery shell space and improve battery capacity. 6. Good discharge characteristics. Polymer batteries use colloidal electrolytes. Compared with liquid electrolytes, colloidal electrolytes have stable discharge characteristics and a higher discharge platform. The design of the protection board is simple. Because the polymer material is used, the battery core does not fire or explode, and the battery itself has sufficient safety. Therefore, the protection circuit design of the polymer battery can be considered to omit the PTC and fuse, thereby saving battery costs. Disadvantages of lithium batteries 1. Lithium primary batteries have poor safety, and there is a danger of explosion. 2. Lithium cobalt oxide lithium batteries cannot be discharged at a high current, and lithium batteries with poor safety require protection circuits to guard against overcharge and overdischarge of the battery. 3. The processing requirements are high and the cost is high. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.