Introduction to the characteristics and structure of lithium-ion batteries

The characteristics of lithium-ion batteries 1. It has a higher weight-to-energy ratio and volume-to-energy ratio; 2. The voltage is high, and the voltage of a single-cell lithium-ion battery is 3.6V, which is equal to the series voltage of three nickel-cadmium or nickel-hydrogen rechargeable batteries; 3. The self-discharge is small and can be stored for a long time, which is the most prominent advantage of the battery; 4. No memory effect. Li-ion batteries do not have the so-called memory effect of nickel-cadmium batteries, so lithium-ion batteries do not need to be discharged before charging; 5. Long life. Under normal working conditions, the number of charge/discharge cycles of lithium-ion batteries is far greater than 500; 6. It can be quickly charged. Lithium-ion batteries can usually be charged with a current of 0.5 to 1 times the capacity, which shortens the charging time to 1 to 2 hours; 7. It can be used in parallel at will; 8. Because the battery does not contain heavy metal elements such as cadmium, lead, and mercury, it is environmentally friendly It is pollution-free and is the most advanced green battery in the contemporary era; 9. High cost. Compared with other rechargeable batteries, lithium-ion batteries are more expensive. Lithium-ion battery structure Lithium-ion batteries usually have two appearances: cylindrical and rectangular. The inside of the battery adopts a spiral wound structure, and a very fine and highly permeable polyethylene film separator is used to separate the positive and negative electrodes. The positive electrode includes a lithium ion collector composed of lithium and cobalt dioxide and a current collector composed of aluminum thin film. The negative electrode is composed of a lithium ion collector made of sheet carbon material and a current collector made of copper thin film. The battery is filled with an organic electrolyte solution. In addition, a safety valve and PTC components are installed to protect the battery from damage when the battery is abnormal and the output is short-circuited. 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.