What is the important reason for the flatulence of the soft-packed lithium battery?

In the normal voltage range, natural gas production is very small, and most of it is hydrocarbons. When abnormal gas production occurs, a large amount of gas will appear, destroying the electrode interface structure, causing electrolyte differentiation and failure, and breaking through the packaging area in severe cases, causing leakage and corrosion risks. It is very necessary to control abnormal gas production from two aspects of data design and processing. First of all, the data and electrolyte system must be designed and optimized to ensure the formation of a fine and stable SEI film, improve the stability of positive data, and control the occurrence of abnormal gas production. In addition, due to the mutual use of lithium cobalt oxide anode materials and electrolytes, their product differentiation will catalyze the differentiation of electrolyte solvents. Therefore, exterior wall coatings with positive information can not only add data structures for safety behaviors, but also combine positive and electrolytic behaviors. Liquid contact reduces the activity of the anode gas to catalyze the attack of differentiation. Therefore, the emergence of positive data particles and the formation of stable and complete coatings are also an important development direction. Do not use it as a process parameter for strict operation and control to ensure the reliability of the package and prevent excessive moisture in the battery from causing gas expansion. The control methods are as follows: (1) Dry enough after the battery winding is completed to prevent excessive moisture in the diaphragm; (2) Strictly control the charging time and humidity of the drying chamber after vacuum baking; (3) Ensure that the liquid injection glove box is sealed; (4) ) Control the content of moisture and free acid in the electrolyte; (5) Standard electrolyte storage environment and sealing conditions to prevent excessive moisture from entering the electrolyte during use and storage; (6) The formation of static after vacuum sealing and exhaust Press or form an external airbag; (7) Choose a multi-step furnace and high-temperature placement process to ensure complete gas production; (8) Improve packaging reliability. The occurrence of gas bilge water is important for normal gas production and abnormal gas production. In order to control the abnormal gas production in the later stage of the battery, it is necessary to start with data design optimization and process control; choose a safe anode material to complete the coating layer, and cut off the electrolyte and Actively respond to differences, with film-forming electrolyte additives, used to ensure the gas attack of the SEI film for safe sex, under the premise of the process, ensure the reliability of the packaging, and enhance the operation of the system, such as water and oxygen-sensitive materials in the battery The interior is a useful solution for flatulence. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.