What kind of damage does overcharge and overdischarge have to the life of lithium-ion batteries?

The so-called overcharging, as the name implies, means overcharging, that is, the battery continues to be charged after it is fully charged. After being fully charged, continue to charge to a certain level. The gas generated by the decomposition of the electrolyte in the lithium-ion battery will cause the battery to swell and even smoke. In this way, the battery will not work properly. Just like a balloon, the balloon will burst sooner or later if it continues to be filled after being filled. Some customers, for the sake of the beauty of their products, or to meet the requirements of product mold design, often only purchase batteries and design their own protection boards, which is also easy to cause overcharging. On the one hand, because their battery professional standards are not high, the experimental 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-ion 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. The so-called over-discharge means that the battery discharges the internally stored power, and after the voltage drops to a certain value, it continues to discharge, resulting in over-discharge. The discharge cut-off voltage is usually determined according to the discharge current, that is, the critical voltage value for judging whether it is over-discharged. In order to prevent excessive consequences, we should set 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 compromising quality and quantity. . Leaving the battery with surplus power is just like leaving a thread for doing things and meeting each other in the future, laying a foundation for recharging. It is like doing the same thing. Starting from scratch is hard. 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 is the reason for the bulging of lithium polymer battery