Introduce the process of cylindrical lithium ion battery and the cause of leakage

Causes of lithium-ion battery leakage. With the further expansion of the electric vehicle market and the continuous improvement of mileage requirements, automobile manufacturers have put forward higher requirements for power lithium batteries in terms of energy density, manufacturing costs, cycle life, and product additional attributes. Under the premise that no major breakthrough has been made in the field of raw materials, adding cylindrical lithium-ion batteries to obtain larger battery capacity has become an exploration direction. Today, a small series of cylindrical lithium-ion battery technology, and the cause of leakage. Cylindrical lithium-ion battery production process Objectively speaking, the production process of lithium-ion batteries is divided into three parts, one is the production of plates, the other is the production of battery cells, and the third is the assembly of batteries. In the production process of lithium-ion batteries, the production of pole pieces is the foundation, the production of batteries is the core, and the assembly of batteries is related to the quality of lithium-ion battery products. The specific process of lithium-ion battery production includes positive pulping, negative pulping, positive electrode sheet, negative electrode sheet, steel shell assembly, liquid injection, testing and packaging. As we all know, the production process of lithium-ion batteries is very complicated. After all, the safety performance of lithium-ion battery products is directly related to the lives and health of consumers. In the production of natural lithium-ion batteries, there are high requirements for the performance, accuracy, stability and automation of the equipment. Take the preparation of electrode paste in the production process of lithium-ion batteries as an example. This link is the most important link in the entire production process. After all, the mixing and dispersion process of electrode paste has an impact on product quality by more than 30%. Why? The reason is that the preparation of positive and negative electrode slurry for lithium ion batteries includes a series of processes such as mixing, dissolving, and dispersing liquid and liquid, and liquid and solid materials, and is accompanied by changes in temperature, viscosity, and environment. In the positive electrode slurry and the negative electrode slurry, the dispersion and uniformity of the granular active material directly affects the movement of lithium ions between the two electrodes of the battery, so the dispersion quality of the electrode slurry directly affects the product performance of the lithium ion battery. Lithium battery. The important reason for the leakage of the JPG cylindrical lithium-ion battery is: the internal pressure is too large, and the outer packaging is unqualified. 1. During the battery manufacturing process, if the following problems occur, the battery may leak: 1. When the battery shell and the battery cover are welded, the welding is not strong, the sealing is not good, there are missing welding, virtual welding, cracks and cracks in the weld. Other problems 2. Steel ball sealing, the size of the steel ball is not suitable, the material of the L-shaped steel ball and the material of the bottle cap are not the same 3. The cap positive electrode is not riveted tightly, there are gaps, and the insulating gasket is not elastic, corrosion resistant, and easy to age. . Problems that may occur during use: 1. The battery is not original, the voltage is too high or the current is too large. 2. The battery often bumps during normal use, damaging the aluminum plastic film, and the internal strength of the battery is insufficient. Cylinder Li-ion battery leakage treatment method▲ Check the battery case. In many cases, the damage to the battery shell is due to improper battery installation, electric welding slag in the frame of the battery box and collision of the frame caused by the low chassis of the frame. ▲Open the cover to check whether there is acid leakage around the safety valve, and then open the safety valve to check whether there is electrolyte flowing inside the battery. ▲There is no abnormality in the first two steps. An air-tightness test should be carried out, that is, air is pressurized in the water to check whether there are bubbles. ▲During the charging process, observe whether there is electrolyte flowing, if so, pull it out. Once you find the leak, clean it up with a knife and fix the leak with battery glue. The reason for battery leakage has a lot to do with the quality of the battery itself, so users must identify genuine high-quality batteries during the purchase process. Therefore, the production process of lithium-ion batteries is closely related to the quality and safety of the products. Every link in the production process of lithium-ion batteries must be strictly and meticulously managed to improve the safety performance of lithium-ion battery products. Users should pay attention to the leakage of lithium-ion batteries. 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: Is it better for electric forklifts to use lithium-ion batteries or batteries?