About 18650 lithium battery cell cap PTC and CID introduction

1. Cylindrical 18650 lithium battery, winding process, internal cap parts, cap, PTC, CID, positive electrode tab. 2. The front and back side of the cap are illustrated. PTC is between the CID and the cap. The resistance value of PTC increases when the temperature rises, and the resistance value decreases when the temperature drops, and it can be restored. The CID is disconnected when the internal air pressure reaches a certain level, alerting the battery to explode. Unrecoverable. The reason for the increase in air pressure is that the external temperature is too high, the battery core is directly short-circuited, and the battery core is overcharged. 3. CID comparison chart. When the CID is normal, the tab connection is normal. When the CID is used and disconnected, the cell is equivalent to no output. 4. CID close-up. Compare OKCID with NGCID. It is clear that the connection is normal and the connection is disconnected. 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 article: How does 1865 lithium battery store electricity?