Lithium battery production process analysis

The first step of the lithium battery production process-electrode slurry preparation and coating. The electrode active material, binder, solvent, etc. are mixed together, and the slurry is formed after sufficient stirring and dispersion. Then use the prepared slurry to evenly coat the current collector (aluminum foil or copper foil, etc.) with a specified thickness, and dry the solvent. The second step-the pole piece punching lamination will punch the pole piece produced in the previous step into the specified size and shape. Assemble the positive and negative plates and the diaphragm together, and form the pole core after the glue is applied. The third step-assembling the soft pack battery. Put the pole core processed in the previous step into the aluminum-plastic film that has been flushed, and complete the top seal, side seal, etc. (and leave a mouth for injection) to form an unfilled Soft pack battery. The fourth step-liquid injection, inject the specified amount of electrolyte into the inside of the soft pack battery. Of course, the battery cell needs to be baked, and the liquid injection operation is carried out in a low humidity environment, too much moisture content is not good. The fifth step-the battery is sealed in a vacuum environment to extract the gas inside the battery and complete the sealing. 1. First of all, weigh the plates inside each battery and match the plates. The capacity of each cluster must be equal, otherwise the group with the smaller capacity will overflow in advance due to the small capacity, then the battery pack with large capacity has not overflowed, the terminal voltage of the battery is low, and the total voltage has not reached the overflowing end voltage and continues Charging causes the group with a small capacity to form an overcharge. If the battery is discharged, the group with the small capacity will lose its power in advance. The voltage of the other batteries is higher, and the total voltage of the battery does not have the termination protection of the electric assist. Voltage and discharge continue to cause battery overdischarge. Overcharge and overdischarge of the battery and untimely charging will affect the service life of the battery. However, the capacity of the battery with the smaller battery is further reduced, and the decrease in the capacity of the battery further causes the The battery is overcharged and overdischarged, and this cycle causes the battery capacity to quickly decrease and become scrapped. 2. The solution of the electrode plate before weighing. Before the electrode plate is weighed, it is necessary to clear the excess front edge, burr, and excess active material during the pasting process. If it is not clean, it will cause the short circuit of the battery plate, that is, the battery self-discharge. . It is necessary to brush the earphone with a pole plate to clean the excess impurities on the pole plate to facilitate welding, so as to prevent false welding and false welding. Choose the ones with uneven poles, those with severe powder removal, and the poles with holes. 3. When the plate is weighed in the plate weighing and matching group, a part of the plates should be weighed out and placed on the workbench in sequence according to the weight, and the weights are compared and marked, and then the plates that are not weighed are weighed on the weighing instrument. Weigh the weight of each plate on the top, and place it together with the plate on the workbench according to the weight of the weighed plate, which saves some trouble. (The weight difference of each group of positive plate or negative plate is as small as possible. The error of 10～14AH should not exceed 1g per group, and the error of 17～20AH should not exceed 2g per group. Disclaimer: Some pictures and pictures of articles published on this site The content comes from the Internet. If there is any infringement, please contact to delete the previous article: How are lithium batteries classified?