Introduction to lithium battery charging process and charging precautions

The four processes of lithium-ion battery charging: The most suitable charging process for lithium-ion batteries can be divided into four stages: trickle charge, constant current charge, constant voltage charge, and charge termination. Stage 1: Trickle charge Trickle charge is used to pre-charge (recovery charge) the fully discharged lithium-ion battery cells. When the battery voltage is lower than about 3V, first charge the battery with a constant current of maximum 0.1C. Phase 2: Constant current charging When the battery voltage rises above the trickle charge threshold, increase the charging current for constant current charging. The current for constant current charging is between 0.2C and 1.0C. The current during constant current charging is not required to be very accurate, and quasi-constant current is also acceptable. In the linear charger design, the current often rises as the battery voltage rises to minimize the heat dissipation problem on the pass transistor. Phase 3: Constant voltage charging When the voltage of the lithium-ion battery rises to 4.2V, the constant current charging ends and the constant voltage charging phase begins. To maximize performance, the voltage regulation tolerance should be better than +1%. Stage 4: Charge termination is different from nickel batteries, and it is not recommended to continue trickle charging of lithium-ion batteries. Continuous trickle charging will cause the plate plating effect of metallic lithium. This will make the battery unstable and may cause a sudden automatic quick disassembly. What are the precautions for charging lithium-ion batteries? ⒈ Prevent charging at excessively high temperature. If the lithium ion battery is used in an environment higher than the specified operating temperature, that is, 35C or higher, the battery's power will continue to decrease, that is, the battery's power supply time will not be as long as usual. If the device is charged at such a temperature, the damage to the lithium-ion battery will be even greater. Even if the battery is stored in a hot environment, it will inevitably cause corresponding damage to the quality of the battery. Therefore, keeping the operating temperature as suitable as possible is a good way to extend the life of the lithium-ion battery. ⒉Prevent charging at too low temperature. If the lithium battery is used in a low temperature environment, that is, below 4C, the battery life will also be reduced. The original lithium battery of some mobile phones cannot even be charged in a low temperature environment. But don't worry too much. This is only a temporary situation, which is different from the use in a high-temperature environment. Once the temperature rises, the molecules in the lithium-ion battery will be heated, and they will immediately return to the previous power. ⒊ Frequent use of life lies in exercise. If you want to give full play to the maximum performance of lithium-ion batteries, you must use it frequently to keep the electrons in the lithium battery in a flowing state. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What is the important difference between lithium batteries and storage batteries?