Cleaning method for liquid injection hole of lithium ion powder battery

Abstract

The invention discloses a cleaning method for a liquid injection hole of a lithium ion power battery. The cleaning method comprises the steps of cleaning the liquid injection hole with laser before laser sealing of the liquid injection hole of the lithium ion power battery, installing a charge coupled device (CCD) photographing detection system on a marker, automatically seeking the liquid injection hole, determining a position of the liquid injection hole, automatically giving out laser, marking and cleaning all surfaces of a sealing part needed to be welded by laser, allowing a crystallization electrolyte, a foreign matter and a surface oxide layer to volatilize at a high temperature during the marking process and to be pumped away with a smoke discharging and dust removal system, and placing a sealing valve for laser welding. The cleaning method has the advantages that manual operation is substituted, electrolyte crystal, the oxide layer and the foreign matter on a surface of the liquid injection hole and around the liquid injection hole all are removed in one time, no fire is exploded during sealing laser welding, the sealing yield is ensured, the efficiency is high, and the cost is low; and the liquid injection hole is automatically sought, automatic cleaning is achieved, the crystallization electrolyte, the foreign matter and the surface oxide layer are volatilized at thehigh temperature during the marking process and are pumped away with the smoke discharging and dust removal system, and a surrounding environment cannot be polluted.

Description

technical field [0001] The invention relates to a method for cleaning a liquid injection port of a power lithium ion battery, belonging to the technical field of lithium batteries. Background technique [0002] With the continuous advancement of lithium-ion power battery technology, lithium-ion batteries with metal casings are becoming mainstream. Due to the advantages of high stability, high safety, small size and wide temperature range, metal casing batteries are popular in the market. Occupancy is on the rise. During the manufacturing process of lithium batteries, after the electrolyte is injected into the battery case, it is necessary to seal the liquid injection port of the battery case to maintain the stability of the electrolyte. At present, laser welding is commonly used to seal. This technology High efficiency and good sealing effect, but the liquid injection port needs to be cleaned before sealing, otherwise the crystalline electrolyte, foreign matter and surface ...

AI Technical Summary

Problems solved by technology

During the manufacturing process of lithium batteries, after the electrolyte is injected into the battery case, it is necessary to seal the liquid injection port of the battery case to maintain the stability of the electrolyte. At present, laser welding is commonly used for sealing. This technology High efficiency and good sealing effect, but the liquid injection port needs to be cleaned before sealing, otherwise the crystalline electrolyte, foreign matter and surface oxide layer at the liquid injection port will cause explosion and leakage during laser welding. The cleaning method currently used It is manually wiped with a dust-free cloth or a dust-free cloth. This method is not only inefficient, but also the electrolyte crystals and foreign objects cannot be completely wiped clean, and the oxide layer cannot be removed, resulting in explosion and leakage during laser welding. Dust paper cannot be reused, resulting in higher cost