Pseudo soldering detection method, pseudo soldering detection device and preparation method of lithium battery

Abstract

The invention relates to a pseudo soldering detection method, a pseudo soldering detection device and a preparation method of a lithium battery, wherein whether pseudo soldering exists in a first welding piece welded on a second welding piece can be detected, the first welding piece has magnetism, and the second welding piece does not have magnetism. The detection method comprises: arranging a magnetic component, and during detection, placing a first welding piece and a second welding piece on one side of the magnetic component, wherein the first welding piece is opposite to the magnetic component; arranging a distance obtaining component for obtaining distance information between the first welding piece and the second welding piece; and determining the distance between the first welding piece and the second welding piece according to the obtained distance information, comparing the maximum value with a set threshold value, and if the maximum value is greater than the set threshold value, determining that the first welding piece is pseudo soldering. According to the invention, non-contact detection is adopted, so that the damage of a detection piece caused by contact can be avoided, the product yield can be improved, detection can be carried out immediately after welding is completed, and the waste of materials and manpower in subsequent procedures caused by poor welding is avoided.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a welding quality detection method and detection device. Background technique [0002] Lithium-ion batteries have the advantages of portability and high energy density, and are currently widely used in various fields. At the same time, users have higher and higher requirements for the quality of lithium-ion batteries, so effective quality control methods are crucial. There is a tab welding process in the production process of lithium-ion batteries. Due to the large fluctuations in the manufacturing process and raw materials, sometimes there will be false welding phenomena such as weak or unwelded pole pieces and tabs. The negative electrode of lithium-ion batteries is usually welded with nickel tab and copper foil, and the positive electrode is usually welded with aluminum metal and aluminum metal. Compared with the welding of positive tab, the welding of negative ta...

AI Technical Summary

Problems solved by technology

There is a tab welding process in the production process of lithium-ion batteries. Affected by the large fluctuations in the manufacturing process and raw materials, sometimes there will be false welding phenomena such as weak or unwelded pole pieces and tabs.

The negative electrode of lithium-ion batteries is usually welded with nickel tab and copper foil, and the positive electrode is usually welded with aluminum metal and aluminum metal. Compared with the welding of positive tab, the welding of negative tab requires higher output energy and tighter tolerance. It is also more prone to false welding, so how to detect the false welding of the negative ear is a difficult problem faced by the industry

Images