What kind of damage will the lithium battery be overcharged or overdischarged?

On the one hand, because their battery professional standards are not high, the test equipment is backward, and the designed overcharge protection parameters are different; on the other hand, because the quality of the cells processed by different cell manufacturers is different, the lithium materials used are also different, if They can't judge, always use the same process to design the overcharge protection parameters, it is also easy to make mistakes and lead to overcharge. Of course, one or two overcharges will not do much damage to the battery, and the user experience is not deep, but as time goes by, the battery will change in quality due to the change in quantity and the battery will not be discharged until it can’t be charged or discharged. , The result can be imagined. Lithium battery charge and discharge detection The so-called overdischarge refers to the discharge of the battery after the battery has discharged the internally stored power. After the voltage drops to a certain value, it continues to discharge, causing overdischarge. The discharge cut-off voltage is usually determined based on the discharge current, that is, the critical voltage value for judging whether it is over-discharge. For 3.7V lithium batteries, 0.2C-2C discharge is generally set to 3.0V, and discharges above 3C, such as 5C or For 10C discharge, set it to 2.4V. Over-discharge of the battery will often bring catastrophic consequences to the battery, especially large current over-discharge, or repeated over-discharge, which has a greater impact on the electrical performance of the battery. This is like a person who loses three to five hundred milliliters of blood at a time, which will not affect people's health. However, once the blood loss is too much, the person's normal body functions cannot be maintained. If it reaches a certain level, the person will die. For the battery, over-discharge will increase the internal pressure of the battery and destroy the reversible function of the positive and negative active materials. Even if it is remedied by charging, it is difficult to fully recover. Naturally, the capacity is clearly attenuated, and the battery will die. , There is no way to come back to life. In order to guard against excessive consequences, we should set up the protection parameters in the early stage according to the characteristics of the battery, and in the later use, we should strictly follow the battery usage regulations in the instruction manual without compromise, and implement it with quality and quantity. . It is best to leave the battery with surplus power, just like leaving a line for doing things, and meeting each other in the future, laying a foundation for recharging, like doing the same thing, starting from scratch is difficult after all. 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 post: How to distinguish the pros and cons of mobile phone batteries