Lithium ion battery charging method and process

Lithium-ion battery charging method Method 1. Before the lithium-ion battery leaves the factory, the manufacturer has carried out the activation process and pre-charged, so the lithium-ion battery has residual power, and the lithium-ion battery is charged according to the adjustment period. This adjustment period needs to be carried out. Fully charge and discharge 3~5 times. Method 2: Before charging, do not discharge the lithium-ion battery. Improper discharge will damage the battery. When charging, try to charge slowly and reduce fast charging methods; the time should not exceed 24 hours. After the battery has been fully charged and discharged for three to five cycles, the internal chemical substances will be fully activated to achieve the best use effect. Method three, please use the original charger or the reputable brand charger, the lithium ion battery should use the lithium ion battery special charger, and follow the instructions, otherwise the battery will be damaged or even dangerous. Method 4: The newly purchased battery is lithium ion, so the first 3 to 5 recharges are generally called the adjustment period, which should be charged for more than 14 hours to ensure full activation of the lithium ion activity. Lithium-ion batteries have no memory effect, but are very inert. They should be fully activated to ensure the best performance in future use. Method 5: Lithium-ion batteries must use special chargers, otherwise they may not reach saturation and affect their performance. After charging, it should be prevented from being left on the charger for more than 12 hours, and the battery should be separated from the mobile electronic product when it is not used for a long time. Lithium ion battery charging process Lithium ion battery is a kind of secondary battery (rechargeable battery), which mainly depends on the movement of lithium ions between the positive electrode and the negative electrode to work. During charging and discharging, Li+ intercalates and deintercalates back and forth between the two electrodes: during charging, Li+ deintercalates from the positive electrode and intercalates into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Lithium-ion batteries are called rocking chair batteries. Charged ions move between the positive and negative electrodes to realize charge transfer, and supply power to external circuits or charge from an external power source. During the specific charging process, external voltage is applied to the two poles of the battery, and lithium ions are extracted from the positive electrode material and enter the electrolyte. At the same time, excess electrons pass through the positive current collector and move to the negative electrode through the external circuit; lithium ions are in the electrolyte. Moving from the positive electrode to the negative electrode, passing through the diaphragm to reach the negative electrode; the SEI film passing through the negative electrode surface is embedded in the negative graphite layered structure and combined with electrons. 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. Phase 1: Trickle charge Trickle charge is used to pre-charge the fully discharged battery cell (recovery charge). 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 battery voltage 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 metal lithium. This will make the battery unstable and may cause a sudden automatic quick disassembly. 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 working principle of lithium-sulfur battery