The different methods of electrolyte injection promote wetting. The single-injection method promotes the wetting of electrolyte in the cell by repeatedly pumping and pressing, while the multi-injection method promotes the wetting of electrolyte in the cell by applying pressure. Immersion injection does not have any measures to promote wetting.
The working principle of the automatic lithium-ion battery liquid filling machine is as follows: the battery box is inverted in the positioning module of the liquid filling plate. The upper box is moved by air pressure, and the upper pressure plate moves synchronously to press and seal the battery box and the liquid filling plate. The inside of the battery box forms the same sealed space with the liquid filling tank through the liquid filling hole. The liquid filling tank is evacuated. After the negative pressure is formed inside the battery, the liquid filling valve is opened. Due to the air pressure difference, the battery liquid automatically flows from the transfer box into the liquid filling tank and the liquid filling valve is closed.
The first electrolyte injection is the initial electrolyte filling. After filling, the battery passes through a high-temperature aging chamber, allowing the electrolyte to penetrate the electrodes and participate in the chemical reaction, converting chemical energy into electrical energy. It's important to note that some electrolytes contain overcharge protectants and other additives; therefore, it's crucial to maintain a sufficient electrolyte level to ensure battery safety. The second electrolyte injection is a replenishment process after formation. During the second injection, sealing is also performed. Common sealing methods include using rubber stoppers, laser sealing with aluminum sheets, or using steel balls and adhesive application. To prevent dust contamination and enhance wetting, the battery can be manually sealed with rubber stoppers after filling, removed before formation, and resealed after formation, only to be removed again before the second electrolyte injection. Only in this way can the battery be safely aged at high temperatures using a stacked plate method.
Lithium-ion battery electrolyte filling equipment
1) Liquid injection equipment;
2) Pressure control equipment, vacuum equipment, and pressurization equipment;
3) Battery fixing structure.
