subject: the battery voltage increased gradually as the charging process [print this page] First, the basic concept of lithium-ion battery:
1, lithium-ion battery nominal voltage 3.7V (3.6V), charging cut-off voltage 4.2V (4.1V, according to the brand batteries have a different design). (Lithium-ion batteries standard argument is: lithium ion secondary battery)
2, the lithium-ion battery charging requirements (GB/T182872000 norms): First of all constant current charging, the current will, and the battery voltage increased gradually as the charging process, when the battery terminal voltage reaches 4.2V (4.1V), constant change Charge for the constant voltage charging, the voltage of a certain, current batteries based on the degree of saturation, with the charging process to continue to gradually reduce, when reduced to 0.01C, the view that charge termination.
(C is the control current of the battery nominal capacity of a representation, such as battery capacity is 1000mAh, 1C charge current is 1000mA, attention mA is not mAh, 0.01C is 10mA.) Of course, that approach is 0.01 standard C5A, here I simplified.
3, Why do you think the end of 0.01C for the charge: this is required by national standards GB/T18287-2000 also discuss the resulting. Before it was generally an end to 20mA, the Ministry of Posts and Telecommunications is the industry standard YD/T998-1999 such provisions, that no matter how much battery capacity, to stop current is 20mA. The national standard 0.01C help more full charge, through the identification of a party manufacturers benefit. In addition, the national standard of the charging time is not more than 8 hours, that is, even if not yet reached 0.01C, 8 hours to, and also that the charging end. (No problem, the quality of the battery, should be within 8 hours to reach 0.01C, the poor quality of the battery, wait meaningless.)
the battery voltage increased gradually as the charging process
