The working principle and charging requirements of lithium batteries

The working principle and charging requirements of lithium batteries At present, most mobile phones use lithium batteries or lithium multi-element composite batteries, whose negative electrode data is made of lithium metal or lithium alloy, and uses a non-aqueous electrolyte solution. The first lithium battery came from the great inventor Thomas Edison. Due to the distinctive chemical properties of metallic lithium, there are high environmental requirements for the production, storage and application of metallic lithium. Therefore, lithium batteries have not been used for a long time. With the development of microelectronics technology in the 20th century, the degree of miniaturization of equipment is increasing. At that time, lithium batteries entered a large-scale practical stage, especially in the use of mobile phone batteries. Nowadays, the standard of lithium batteries commonly used in mobile phones is: lithium ion secondary batteries. The nominal voltage of commonly used lithium batteries is 3.7v (or 3.6v), and the charge cut-off voltage is 4.2v (or 4.1v, depending on the battery brand). The requirements for lithium batteries (GB/T182872000 standard) are first of all constant current charging, current must be, and battery voltage and charging process are gradually added, when the battery voltage is 4.2V, 4.1V), constant voltage charging, not voltage must be current The fullness of the constant current rechargeable battery is continuously reduced according to the charging process. When it is reduced to 0.01 degrees Celsius, the charging is considered to be suspended. We noticed that C is a way to express the battery's rated capacity versus current. For example, if the battery capacity is 1000mAh, then 1C is the charging current of 1000mA. Note that this is mA and not mAh. Of course, the standard indication is 0.01c5a. So why do you think the 0.01C charge is over? In fact, this is the national standard GB/t18287-2000. In the past, we generally ended up with 20mA, but the industry standard YD/t998-1999 of the Ministry of Posts and Telecommunications is the same rule, that is, no matter how big the battery capacity is, the stop current is 20mA. The national standard of 0.01°C will help the charge to be fuller, which is beneficial to the manufacturer after identification. In addition, the national standard stipulates that the charging time should not exceed 8 hours, that is, even if it does not reach 0.01°C, the charging will end after 8 hours. A good-quality battery reaches 0.01C within 8 hours, and a poor-quality battery makes no sense to wait. So, remind us that when charging does not exceed 8 hours, this is conducive to the life of the battery. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.