What is the progress of the production process of lithium-ion battery packs?

Generally, during the hot pressing and shaping of the cell, an insulation withstand voltage test is performed on the cell at the same time to detect whether there is a micro short circuit inside the cell. If there are tiny metal foreign particles inside the cell, the cell barrier punctures when the cell is depressed, and it is easy to detect the micro-short circuit failure. Key points of the production process of lithium-ion battery packs. The important process parameters for the hot pressing of the cell are pressurizing pressure, pressurizing time and template temperature. Under the appropriate process parameters, there is almost no atmosphere inside the thick battery cell, and the barrier and the pole piece are tightly bonded together, and the loose battery core can become a lumpy state. In the process determination test, the test items include the permeability and thickness change of the barrier; whether the thickness of the battery cell meets the requirements of the shell; whether the pole piece is broken, etc. As the focal part of the lithium-ion battery pack, the battery barrier plays a key role in cutting off the electron conduction between the positive and negative electrodes and allowing lithium ions to pass between the north and south poles. The micropore layout on the barrier is precisely where these ions go back and forth. The air permeability of the important channels of the positive and negative electrodes will directly affect the function of the battery. The permeability of the barrier refers to the amount of gas that the barrier can penetrate under a certain time pressure. If the air permeability of the barrier is not good, it will affect the notification of lithium ions between the positive and negative electrodes, and then affect the charge and discharge of the lithium ion battery. The test process is: secure the battery barrier, apply air pressure on one side of the barrier, measure the air pressure drop and the time used, and detect the air permeability of the barrier. The shorter the time, the better the air permeability. During the hot pressing process, the barrier is probably severely compressed, and the thickness of the barrier changes greatly, causing the micropores to be blocked. Visual inspection of the barrier will turn into a transparent color. This environment shows that the hot press shaping exceeds the limit of the use of the battery and will affect the lithium ion. transmission. 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: Explanation of important differences between polymer lithium-ion batteries and lithium-ion batteries