Welding method for liquid injection hole of lithium ion battery threaded pole

Abstract

The invention relates to a welding method for a liquid injection hole of a lithium ion battery threaded pole. The manufacturing process comprises the step that fusion sealing welding is carried out on the liquid injection hole of a welded battery. The welding method is characterized in that the manufacturing process further comprises the step that before sealing welding, a ceramic ring is arranged on the threaded pole in a sleeving manner, and a closed weld pool is formed at the welding part of the liquid injection hole in the threaded pole in the circumferential direction. By means of the characteristics that ceramic is low in heat conductivity, and the ceramic and metal cannot be welded, the closed weld pool is formed at the welding part of the liquid injection hole in the threaded pole; when the liquid injection hole is welded, the ceramic ring effectively prevents liquid in the closed weld pool from flowing outwards, a thread on the battery pole is protected, and the phenomenon that the battery is scrapped due to the thread damage caused by seal welding is eliminated. Meanwhile, due to the fact that the ceramic is low in heat conductivity, the welding quality cannot be affected even when the heat of the welding weld pool is absorbed. The metal in the fusion state cannot be welded to the ceramic into a whole so that the consequence that the ceramic ring cannot be taken down after welding cannot happen, and the work efficiency of the welding of the liquid injection hole is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion storage battery welding, in particular to a welding method for a liquid injection hole of a threaded pole of a lithium-ion battery. Background technique [0002] With the development of lithium-ion battery technology, lithium-ion batteries are used in almost all fields, replacing the existing nickel-cadmium batteries and nickel-hydrogen batteries one after another. People's requirements for the durability and reliability of lithium-ion batteries are also getting higher and higher. . [0003] After the electrolyte is injected into the lithium-ion battery, the liquid injection hole needs to be welded. In order to avoid excessive heat transfer to the inside of the battery, heat dissipation tooling is required. The currently known welding process of the liquid injection hole of the lithium-ion battery is usually to fix the heat dissipation tooling on the threaded pole, add solder to the liquid in...

AI Technical Summary

Problems solved by technology

The currently known welding process of the liquid injection hole of the lithium-ion battery is usually to fix the heat dissipation tooling on the threaded pole, add solder to the liquid injection hole, and complete the welding seal. The plane of the welded liquid injection hole must expose the heat dissipation tooling for a certain distance. Otherwise, the heat dissipation tooling will take away the heat from the welding surface and the fusion welding cannot be completed, such as image 3 As shown; during fusion welding, a molten pool is formed on the end surface of the pole. Since the end surface of the pole is open, when the battery liquid injection hole is sealed and welded, the solution on the molten pool is easy to flow out and cause the thread on the pole to The battery is damaged due to damage; in order to prevent the thread from being damaged, the requirements for the welding operation are high, which reduces the welding efficiency, and it is also easy to cause the battery to be invalidated due to the solution on the molten pool overflowing to the thread of the pole

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