Electrolyte injection method for lithium battery with vacuum pumping function

 When a lithium ion battery is in normal operation, the negative terminal drawn from the negative current collector and the positive terminal drawn from the positive current collector form an electronic path with the external circuit. The lithium ions in the electrolyte and the positive and negative active materials form an ion path, an electronic path and an ion path Together to form a loop to achieve the purpose of normal work. With the gradual increase in demand for lithium-ion batteries, people have higher and higher requirements for their performance in all aspects, especially the requirements for the cycle performance of the battery, and the amount of liquid injection of the battery is an important parameter to ensure the battery cycle. Too little liquid injection will cause the cycle to decay too fast and cause the battery life to decay too fast. However, too much liquid injection will cause the battery to swell and damage the overall structure of the battery.

  In traditional lithium battery injection production, manual injection is generally used to perform one-to-one injection processing, which has low injection accuracy, low production efficiency and poor safety.

Although there are two types of automatic electrolyte injection machines in the prior art, the forward injection type and the vacuum reverse suction type, the vacuum reverse suction type injection method requires high sealing performance of the equipment pipeline, and the sealing conditions It is harsh; and the forward injection method also has technical problems that are difficult to control the accuracy of the injection.

  In addition, the existing liquid injection machine generally performs liquid injection in an atmospheric environment. When the moisture content in the atmospheric environment is high, the water in the atmosphere will react with the solute lithium hexafluorophosphate to generate hydrofluoric acid. Its electrochemical performance and safety performance have a great influence. In addition, the existing liquid injection machine cannot detect the liquid injection amount during the liquid injection process, and thus cannot immediately find the liquid injection failure and equipment problems. And the existing liquid injection machine does not have a sealing function, and the lithium battery after liquid injection needs a special sealing machine for sealing, and the production efficiency is low.

  In view of this, Mikrouna provides a lithium battery automatic production line to solve the existing lithium battery electrolyte injection efficiency is low, the injection accuracy is poor, and the technology cannot prevent the reaction between atmospheric moisture and the electrolyte solute lithium hexafluorophosphate during injection. problem.

  The automatic production line of Mikrouna's lithium battery can realize automatic scanning-injection-weighing-replenishment-seal operation in the super clean glove box, realizing high-efficiency and completely unmanned automatic production, sealing the battery after the injection, and the battery sealing Automatic completion, high production efficiency.