What is the reason for the aging detection of lithium batteries

Aging is to load and run the product under a certain temperature and/or load, and then test whether the performance index of the product meets the technical requirements after a period of time or after a cycle. Lithium battery aging generally refers to the placement of the lithium battery after the first charging and forming after the completion of the assembly and injection of the lithium battery. It can be aging at room temperature or high temperature. The purpose is to stabilize the properties and composition of the SEI film formed after the initial charge. The normal temperature aging temperature is 25 degrees, and the high temperature aging is different in different factories, some are 38 degrees and 45 degrees, and the time is between 48-72 hours. So why do we need to detect the aging of power lithium batteries? There are three important purposes for aging detection: 1. After the battery has undergone the pre-forming process, a certain amount of SEI film will be formed on the graphite negative electrode inside the battery, but this film has a compact structure and small pores. It will be helpful to age the battery at high temperature. The SEI structure is reorganized to form a loose and porous membrane. 2. The voltage of the battery is in an unstable stage after formation, and its voltage is slightly higher than the true voltage. The purpose of aging is to make its voltage more accurate and stable. 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 are the key features of gel batteries for electric vehicles?