Is the life of a lithium battery calculated by time or by the number of cycles?

The industry refers to the performance of lithium batteries according to the number of cycles. However, in practical applications, the user's use methods are very different, because under different conditions, there is no comparability between tests, so the meaning of cycle life must be standardized and compared. According to the national standards, the test conditions and the cycle life requirements of lithium batteries are as follows: Charge 150 minutes constant current and constant voltage charging system (1c) at room temperature 25c, discharge at constant current, discharge until 2.75v system is a cycle (1c). When the discharge time is less than 36 minutes, the test ends, and the number of cycles must be greater than 300. In fact, the number of recycling of lithium batteries is not only affected by the different ways users use them, but also related to the processing technology level and material formula of lithium battery manufacturers. Lithium battery pack: This meaning stipulates that the cycle life test is carried out in the case of deep charging and deep release. The cycle life in this mode must be more than 300 times to reach more than 60%. In fact, the cycle system of different cycles has a great deal It is different. If it exceeds other conditions, only change the constant voltage voltage from 4.2V to 4.1V. The constant voltage cycle life test of the battery of the same model voltage, so the battery is not deep-filled, and the final test cycle life time can be increased by nearly 60%. With the newly added cut-off voltage of 3.9V, the period should be able to increase several times. Regardless of the rules, it is meaningless to talk about cycle time, because cycle time is a measure of battery life, not the purpose itself! Misunderstanding: Many people like to use lithium batteries to charge mobile phones. This is completely unnecessary. In fact, it is impossible for the user to use the battery in the gb test mode. 2.75v does not shut down, the discharge method is not high current constant discharge, but a mixture of GSM pulse discharge and small current discharge. There is another way to measure the life cycle, and that is time. Some experts have proposed that the service life of general civilian lithium batteries is 2 to 3 years. According to the actual situation, such as the end of the service life of a lithium battery with a capacity of 60%, coupled with the aging effect of lithium batteries, it is more reasonable to express the cycle life by time. 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: Maintenance and repair of lithium-ion batteries for electric vehicles