Polymer lithium ion battery formation process capable of exhausting gas and supplementing liquid

Abstract

The invention discloses a polymer lithium ion battery formation process capable of exhausting gas and supplementing liquid, and belongs to the field of polymer lithium ion battery cell preparation andpackaging. According to the technical scheme, before a battery cell is packaged, a liquid supplementing pipeline is inserted into the battery cell along the bottom end of a battery pole piece, and anexhaust pipeline is communicated to the edge of the battery cell along the top seal side of the battery cell; liquid injection is performed, preliminary packaging is performed on the battery cell with an air bag after liquid injection, and vacuum placement is performed on the pole piece to be infiltrated by the electrolyte; pressure and temperature are set, pressurization formation is carried out, and gas is directly led out to an exhaust gas treatment system through a single-phase exhaust pipeline; in the formation process, residual electrolyte slightly higher than a calculated value is injected; and after the formation process is finished and the battery cell cools down, the battery cell is taken out, a preset pipeline is checked and sealed and the battery cell is put in storage. The polymer lithium ion battery formation process capable of exhausting gas and supplementing liquid has the beneficial effects that the cost can be reduced, the process is simplified, the safety performance and the electrochemical performance are improved, and possibility is provided for realizing cascade utilization and capacity recovery of waste battery cells.

Description

technical field [0001] The invention belongs to the field of preparation and packaging of polymer lithium-ion batteries, and in particular relates to a polymer lithium-ion battery formation process capable of exhausting and replenishing liquid. Background technique [0002] The patent name is a soft-pack lithium battery exhaust and liquid replacement device, and the application number is 201811562441.5. It is a Chinese invention patent application, mainly for device structure and design patents, and the scope of use has not been determined. The structure of the exhaust and liquid replacement device includes a three-layer communication pipe, a first elastic gasket, a second elastic gasket and an outer rubber layer. The heat-sealing layer is mated and connected, and the first elastic gasket and the second elastic gasket are respectively arranged in the three-layer communication pipe. [0003] The name of the patent is a lithium-ion battery with the function of exhaust and rep...

AI Technical Summary

Problems solved by technology

[0005] (1) During the packaging process of the original polymer lithium-ion battery, the aluminum-plastic film air bag is too large, and the waste rate of the aluminum-plastic film is high;

[0006] (2) When the original process air bag is insufficiently reserved, there will be hidden dangers of explosion or battery cell leakage during the formation process, and the safety of the laboratory is low;

[0007] (3) When the two seals of the original process are vacuum pumped and sealed, the electrolyte will be lost with the pumping process, and the insufficient amount of electrolyte will lead to a decrease in electrochemical performance;

[0008] (4) In the original process, after the cells are formed, two vacuum seals are set, and the process is cumbersome;

[0009] (5) Existing exhaust and fluid replenishment devices focus more on exhaust and fluid replenishment during battery use or failure, ignoring the need for exhaust and fluid replenishment during cell preparation

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