Lithium battery injection process and issues analysis

The current common liquid injection methods for lithium battery injection technology are divided into two categories, one is to inject the liquid directly through the injection hole, and the other is to put the battery into the electrolyte to allow the electrolyte to penetrate into the battery. The way of injection through the injection hole can be divided into single injection and multiple injection according to the injection volume. Several injection methods have different measures to promote infiltration. The single injection method promotes the infiltration of the electrolyte in the cell by repeated pumping, while the multiple injection method promotes the use of pressurization. The electrolyte is infiltrated in the cell, and the immersion injection has no measures to promote the infiltration. The working principle of the liquid injection of the lithium battery automatic liquid injection machine is that the battery box is placed upside down in the positioning module of the liquid injection plate, the air pressure drives the upper box to move, and the upper pressure plate moves synchronously so that the battery box and the liquid injection plate are compressed and sealed, and the inside of the battery box passes The filling hole and the filling box form the same sealed space, and the filling box is evacuated. After the negative pressure is formed inside the battery, the filling valve is opened, and the battery liquid will automatically flow from the transfer box into the filling box due to the air pressure difference, and the filling box will be closed. Liquid valve. One injection is the first injection. After the injection, the electrolyte is infiltrated into the pole piece through the high-temperature aging room, participates in the chemical reaction, and realizes the conversion of chemical energy and electric energy. It should be noted that some electrolytes are added with additives such as overcharge protection agents, so it is necessary to maintain the amount of electrolyte to ensure battery safety. The second injection is a process of replenishing the electrolyte after the formation. When the second injection, the sealing is also considered. The commonly used sealing methods include rubber plugs, aluminum laser sealing; steel balls, and glue sealing. In order to guard against dust pollution and enhance the infiltration effect, the battery can be manually sealed with a rubber plug after liquid injection, unplugged before chemical conversion, sealed again after chemical conversion, and unplugged before second injection. Only in this way can the stacking method be used safely. Ageing. Precautions for liquid injection in lithium battery processing 1. The cylinder on the liquid injection machine must use the same pressure process gas as the glove. The pressure is 3-5Bar. 2. The processing department must set up a dedicated person to configure electrolyte, and other people are not allowed to configure electrolyte at will. 3. When the additives enter the glove box, put them into the bottles in the glove box. All the bottles containing additives must be hung with a sign, distinguished by color, and marked: Additives. 4. Please read this manual carefully before using the liquid filling machine equipment, otherwise improper operation may cause accidents such as mechanical failure and personal injury. 5. Regularly check whether the fasteners of the liquid injection machine are loose, and whether the sensors, motors, cylinders, solenoid valves, etc. are malfunctioning, so as to avoid unnecessary losses. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the characteristics of UPS battery packs in series and parallel