During the manufacturing of 18650 lithium batteries, a protective adhesive or tape is sometimes applied to the side of the cell to prevent short circuits or contamination. This adhesive or tape serves the following purposes:
1. Preventing short circuits: There must be a separator between the positive and negative electrodes of a lithium battery. If there is no protective adhesive on the surface of the cell, the positive and negative electrodes are very likely to come into contact and form a short circuit, which can lead to thermal runaway inside the battery or even an explosion.
2. Preventing Cell Contamination: During manufacturing and transportation, dust, dirt, and other impurities can adhere to the surface of the battery cells. If these impurities fall into the cell, they will affect the battery's performance and lifespan. Protective adhesive prevents these impurities from adhering to the cell surface, thus ensuring battery quality.
3. Increase cell strength: Applying adhesive or tape to the sides of the cell can increase its mechanical strength and prevent damage caused by vibration, collision or other reasons during transportation or use.
In short, applying adhesive or tape is to protect the battery cell from external factors, ensuring the safety and quality of the battery cell, thereby guaranteeing the reliability and stability of the lithium battery.
