Laser welding jig and method for lithium battery cell positive and negative pole pieces and lead-out pole lugs

Abstract

The invention discloses a laser welding jig and method for lithium battery cell positive and negative pole pieces and lead-out pole lugs. According to the laser welding jig and method for the lithiumbattery cell positive and negative pole pieces and the lead-out pole lugs, welding is performed adopting a laser welding manner, product deformation is eliminated, and the welding quality and the appearance attractiveness are improved; in the welding process, no contact exists between a welding head and a welded product, equipment has no parts worn and torn easily, and the maintenance cost is low;and the product is fixed through gas pressure, and welding mistake caused by moving of the product in the welding process is prevented. By means of the laser welding jig and method for the lithium battery cell positive and negative pole pieces and the lead-out pole lugs, the product with attractive molded appearance can be welded and formed, the cost is saved, furthermore, loss of the welding head and the jig is avoided, and meanwhile, the product quality can be monitored.

Description

technical field [0001] The invention relates to the technical field of laser welding, in particular to a laser welding jig and method for positive and negative plates of a lithium battery cell and tabs. Background technique [0002] The current solution for welding the positive and negative pole pieces of lithium battery cells and the lead-out tabs generally adopts ultrasonic welding technology. Ultrasonic welding uses high-frequency vibration waves to transmit to the surfaces of two objects to be welded. The surfaces of two objects rub against each other to form a fusion between the molecular layers. Ultrasonic welding has good conductivity and extremely low resistivity, and is widely used in the welding of copper foil and nickel sheet, aluminum foil and aluminum sheet in lithium batteries and polymer batteries. However, ultrasonic welding belongs to contact welding, which uses ultrasonic high-frequency mechanical vibration to act on the surface of the metal sheet and pres...

AI Technical Summary

Problems solved by technology

However, ultrasonic welding belongs to contact welding, which uses ultrasonic high-frequency mechanical vibration to act on the surface of the metal sheet and pressurizes to weld the metal sheets together. The vibration and pressure of the welding head on the metal sheet will cause deformation and surface scars of the metal sheet. The junction is easy to break, the welding head and fixture are easy to wear, and cannot be monitored, and the cost of frequent replacement is high. There are disadvantages such as poor product appearance, easy wear and tear of welding head and fixture, and difficult product quality monitoring.

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