Forced air drying device and method for removing residual electrolyte by adopting forced air drying device

Abstract

The invention discloses a forced air drying device and a method for removing a residual electrolyte by adopting the forced air drying device. The forced air drying device comprises a battery cell trayfor bearing a battery cell, a forced air drying tray and a pressurized air blowing device. A forced air drying unit is positioned on the forced air drying tray and comprises a shell, an air inlet pipe, an air outlet pipe and a sealing piece fixedly arranged on the shell, wherein the air inlet pipe and the air outlet pipe are arranged in the shell. The forced air drying unit and the battery cell form a closed cavity by virtue of a sealing piece, an air inlet pipeline communicates with the pressurized air blowing device and blows air to the air inlet pipe of the forced air drying unit, and theair outlet pipe communicates with an air outlet pipeline to discharge gas carrying electrolyte steam. A non-contact circulating blast mode is adopted to replace two independent processes of manually wiping a shell opening and a positive tab in the prior art, and a plurality of battery cells are simultaneously dried at a time, so that manual production processes are reduced, the production efficiency is greatly improved, the reject ratio of products is obviously reduced, and the service life of the products is prolonged.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a blast drying device and a method for removing residual electrolyte by using the same. Background technique [0002] In the current liquid injection process for the production of cylindrical lithium-ion batteries, the injection volume and injection time of the electrolyte can be controlled more precisely, and the production efficiency is relatively high. As a result, some electrolyte droplets remain on the positive ear and between the sealing ring of the liquid holding cup and the position of the lithium-ion battery roll groove. However, the residual electrolyte on the positive tab will lead to false welding and desoldering of the subsequent laser welding of the cover plate. Therefore, it is usually necessary to add an additional process of wiping the tab after the liquid injection process. Although there are currently existing equipment that can automatically wipe the posi...

AI Technical Summary

Problems solved by technology

[0002] In the current liquid injection process for the production of cylindrical lithium-ion batteries, the injection volume and injection time of the electrolyte can be controlled more precisely, and the production efficiency is relatively high. As a result, some electrolyte droplets remain on the positive ear and between the seal ring of the liquid holding cup and the position of the lithium-ion battery roll groove

However, the residual electrolyte on the positive tab will lead to false welding and desoldering of the subsequent cover plate laser welding, so it is usually necessary to add an additional process of wiping the tab after the liquid injection process

Although there are currently existing equipment that can automatically wipe the positive tabs before laser welding, this part of the process usually needs to be done after straightening the tabs. During the process of straightening the tabs, the residual electrolyte may still splash onto the skin Potentially harmful even in the eyes

In addition, although there is a small amount of electrolyte remaining at the position of the battery rolling groove, it may still cause the shell to rust after the battery is sealed. At present, the main treatment method is manual wiping, which has problems such as low efficiency and inconsistent results; other solutions are Wipe the residual electrolyte by designing a rotating structure with a wiping cloth. Considering the ratio between the diameter of the rotating structure and the diameter of the cylindrical battery and the position of the positive ear, it is easy to scratch the positive ear in actual operation and reduce the battery qualification rate; Moreover, these solutions mainly wipe the vertical inner wall of the battery, but the effect of wiping the residual electrolyte on the near horizontal inner wall of the rolling groove is relatively small, and the overall effect of removing the electrolyte is not very satisfactory.

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