The aging process in the production of lithium-ion batteries refers to the process of allowing the battery to be stored in a controlled environment for a period of time after injection or formation, in order to fully stabilize its internal chemical composition. This process is a crucial step in ensuring the consistency and safety of battery performance.

The workflow is mainly divided into the following stages:

Static storage: Transfer the sealed battery to a constant temperature aging warehouse (usually controlled at 20-30 ℃), and place it in a specific posture (such as upright) on the shelf for long-term static storage. The settling time can range from 24 hours to several days according to the process requirements.

Internal reaction and stability: During the static period, the electrolyte further infiltrates the membrane and electrode through capillary action, ensuring good interface contact. At the same time, residual trace side reactions inside the battery (such as the further formation of a stable SEI film) will slowly progress and tend to complete, and the internal voltage and chemical system will gradually reach a stable equilibrium state.

Performance screening and testing: After aging, the battery is subjected to open circuit voltage (OCV) testing and internal resistance measurement. By analyzing the stability of voltage drop, it is possible to screen out cells with abnormal voltage changes (such as excessive self discharge), effectively eliminate potential defects such as micro short circuits and poor sealing, and ensure the consistency of the factory products.

Summary of Function:

Although the Chen chemical process does not involve complex equipment operations, its principle of "time for stability" is crucial. It can effectively improve the voltage stability, consistency, and safety of batteries, and is an implicit key link to ensure the final product yield and reliability.