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After completing welding, it is usually necessary to conduct leak detection and remove batteries with unqualified leak rates. Common leak detection methods include direct pressure, double pressure, and differential pressure. Good sealing is the key to ensuring the long-term stability and reliability of lithium-ion battery performance. Therefore, battery leak detection is also an essential part of the processing of square power lithium-ion batteries.

The battery that has undergone leak detection and screening then enters a very important liquid injection process. Due to the sensitivity of the electrolyte of lithium-ion batteries to moisture, the liquid injection process must be carried out inside the drying room. In order to improve the wetting effect of the electrolyte, vacuum liquid injection is usually required.

The battery, which is fully saturated with electrolyte, then enters the formation process, which is important for activating the battery through small current charging and discharging.

In addition, due to the problem of gas generation during the decomposition process of electrolytes, the gas generated may accumulate in the battery cells, resulting in insufficient electrolyte infiltration. Therefore, some manufacturers also arrange the battery sealing after the formation process to discharge the gas generated during the formation process.

After formation, the battery also needs to undergo aging. The so-called aging refers to storing the fully charged battery at a certain temperature. During the storage process, some side reactions inside the lithium-ion battery can cause changes in the external voltage and internal resistance of the battery. By monitoring the voltage, internal resistance, and capacity of the battery pack, it is possible to eliminate batteries that do not meet the self discharge and internal resistance requirements, in order to improve the consistency of individual batteries, At the same time, the aging results are also an important reference for subsequent battery pack matching. In order to accelerate the speed of battery aging and improve processing efficiency, manufacturers usually age at high temperatures (50-60 ℃) to shorten the battery aging time.

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