Rivet-pulling sealing method for lithium battery liquid injection seal

Abstract

The invention discloses a rivet-pulling sealing method for a lithium battery liquid injection seal. The method comprises the following steps: 1, fixing a single battery of which a battery liquid injection hole needs to be sealed in advance, wherein the battery liquid injection hole is formed in the top of the single battery; 2, horizontally putting a sealing ring into the battery liquid injection seal; 3, vertically installing the rivet rod of a rivet on a hand riveter, and clamping; 4, enabling a rivet head on the lower portion of the rivet to vertically penetrate through the inner ring through hole of the sealing ring, and then inserting the rivet head into the battery liquid injection hole to make the bottom face of a locking ring of the rivet in contact with the top face of the sealing ring; and 5, operating the hand riveter, so as to make the nail head fix the battery liquid injection hole, and make the sealing ring seal the battery liquid injection hole. The sealing process of the battery liquid injection hole can be simplified, so that the variable in the battery production process is reduced, the sealing performance of the battery is ensured, the production stability, safety and reliability of the battery are improved, and the overall manufacturing cost of the battery is reduced.

Description

technical field [0001] The invention relates to the technical field of lithium ion power batteries, in particular to a blind riveting sealing method for liquid injection sealing of lithium batteries. Background technique [0002] At present, with the country's strong support for the new energy industry, my country's lithium-ion power batteries have developed rapidly and have been used in various fields of life and energy storage, especially in the field of new energy vehicles. [0003] In the manufacturing process of lithium batteries, after the liquid injection process is completed, the liquid injection hole on the top of the battery cover plate needs to be laser sealed and welded with a seal to prevent electrolyte leakage and achieve the effect of battery sealing. [0004] For lithium-ion power batteries, in order to complete the sealing of the battery after liquid injection, laser welding and sealing technology is mainly used now, that is, laser welding is carried out bet...

AI Technical Summary

Problems solved by technology

When the molten pool is close to the seal, there is a risk of partial vaporization of the seal, and the pressure inside the battery is ejected upward along the axial direction, resulting in the risk of battery cracks, explosion, etc.

Moreover, laser welding and sealing technology has high requirements for related equipment and processes, and the initial investment cost is high, which in turn increases the overall manufacturing cost of lithium-ion power batteries.

[0006] In addition, the existing laser welding sealing technology has high requirements for the assembly accuracy of the seal and the battery liquid injection hole, and the specific welding position must be accurate, otherwise, it is easy to cause welding defects

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