How is the life of a lithium-ion battery calculated?

Just change the 4.2V constant voltage voltage to 4.1V constant voltage voltage to test the cycle life of the same type of battery. It is stipulated that the cycle life must exceed 300 times after the execution of this mode. The capacity is still more than 60%. In fact, The national standard stipulates the cycle life testing conditions and requirements of lithium-ion batteries: charging at a constant current and constant voltage at a room temperature of 25 degrees and a 1C charging system for 150 minutes, not the purpose! Misunderstanding: Many people like to use mobile phone lithium-ion batteries automatically Turn off and recharge. Some experts have proposed that the life of general civilian lithium-ion batteries is 2 to 3 years, and the discharge system of constant current 1C is discharged to 2.75V as a cycle. The number of cycles obtained by different cycle systems is completely different, but GSM Pulse discharge and the usual low-current discharge are mixed. In fact, the number of cycles of lithium-ion batteries is also related to the processing technology and material formulations of manufacturers who process lithium-ion batteries. For example, 60% capacity is used as the end of life. In addition to the time-efficient use of lithium-ion batteries, it is impossible for users to use the battery in accordance with the national standard testing mode. It is more reasonable to use time to express the cycle life. Lithium-ion battery pack: This meaning stipulates that the cycle life test is based on deep charge and deep discharge. Way. Finally, the cycle life can be increased by nearly 60%. If the cut-off voltage is increased to 3.9V for testing, no mobile phone will shut down at 2.75V. This is completely unnecessary, and its discharge mode is not a high current constant current. Discharge. In fact, because the number of cycles is a means of testing battery life. In this way, this battery is no longer a deep charging method, and the number of cycles must be greater than 300. Combined with the actual situation, it is time. There is another measure of cycle life. When one discharge time is less than 36 minutes, the test ends. The number of cycles should be increased by several times. It doesn't make any sense to talk about the number of cycles aside from the rules. For example, the other conditions above remain unchanged, except that the way users use them is affected. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete.