What is the difference between 3.7V and 4.2V lithium-ion battery voltage?

Li-ion battery voltages of 3.7V and 4.2V indicate that one is 3.6V rated voltage parameter and the other is 4.2V rated working voltage parameter; the power will be different for different voltages. 3.7V battery, charge cut-off voltage 4.2V, discharge cut-off voltage is 3.0V. Therefore, when the open circuit voltage of the battery is lower than 3.6V, it should be able to charge. What is the difference between 3.7V and 4.2V lithium-ion battery voltage? Lithium-ion battery voltage standard is 3.7V or 4.2V, which is one thing. It's just that the manufacturer's label is different. 3.7V refers to the platform voltage when the lithium-ion battery is discharged during use, and 4.2V refers to the voltage when the battery is fully charged. Common rechargeable 18650 lithium ion batteries, the voltage is standard 3.6 or 3.7v, when fully charged is 4.2v, this has nothing to do with the power (capacity), 18650 batteries from 1200mah to 4000mah, 3.7V refers to battery power The lowest voltage at the end. It is generally believed that when the no-load voltage of a lithium-ion battery is set to 3.7V, the battery is considered to be exhausted. Lithium-ion battery discharge cannot put the no-load voltage below 3.7V, otherwise the battery will be damaged. 4.2V is the highest limit voltage for battery charging , It is generally believed that when the no-load voltage of a lithium-ion battery is charged to 4.2V, the battery is considered to be fully charged. During the battery charging process, the battery voltage gradually rises from 3.7V to 4.2V. The lithium-ion battery cannot be charged to 4.2V. Above V, otherwise it will damage the battery. In theory, there is no difference; 1: If one is a 3.6V rated voltage parameter and the other is a 4.2V rated working voltage parameter according to strict standards, there is a difference; 2: But the ICBC and the electronic industry standards are different, and sometimes they will The maximum working voltage is sometimes marked as the minimum working voltage, while the minimum working voltage of a lithium-ion battery is about 3.2V, and the highest is about 4.5V, so 3.7/4.2 is between the working voltage parameters, and there is no practical functional difference. Generally, 3.7V lithium-ion batteries must have overcharge and over-discharge protection boards. If the battery does not have a protection board, only a charging voltage of about 4.2V is used, because the ideal full charge voltage of a lithium-ion battery is 4.2V, and the voltage may exceed 4.2V. If the battery is damaged, use this method to charge while monitoring the condition of the battery at all times. Generally, 3.7 lithium-ion batteries are used. The voltage of 3.7V lithium-ion batteries will drop during discharge, generally from 4.2V to about 3.0V, so the voltage marked on the battery is not a stable output voltage. The standard voltage of lithium-ion batteries is about 7.4V, so there is no difference between 3.7V and 3.8V, that is, 3.8V charging may be more sufficient. 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 are the important advantages and disadvantages of graphene batteries?