Welding structure for plate electrode foils and plate lug of lithium battery

Abstract

The invention discloses a welding structure for plate electrode foils and a plate lug of a lithium battery. The welding structure comprise an electrode formed by superposing a plurality of plate electrode foils, wherein the electrode consists of a positive electrode and a negative electrode, the plate electrode foils are welded with one another, the plate lug is welded with one side of the electrode, a damping sheet is arranged at the other side of the electrode, a damping chamber is arranged at the inner side of the damping sheet, a high temperature resistance gum is filled in the damping chamber, the periphery of the damping sheet extends outwards to form an annular welding surface, and the annular welding surface is welded with the electrode; a through hole is formed in the bottom of the damping chamber; the upper end of the damping sheet extends upwards in a bending mode to form an electrode end part retaining sheet and a plate lug connecting plate respectively, the electrode end part retaining sheet clings to the outer end surface of the electrode, and the plate lug connecting plate is welded with the inner side surface of the plate lug. Therefore, the welding structure has the beneficial effects that when the plate electrode foils are welded with the plate lug, the plate electrode foil at the outermost layer cannot be shocked to be broken by virtue of ultrasonic waves, and the service life of the lithium battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of connecting lithium battery pole pieces and foils, in particular to a welding structure between lithium battery pole pieces and tabs. Background technique [0002] The pole piece foil is drawn from one end of each lithium battery pole piece. After being drawn out, the pole piece foil on each pole piece is laminated and welded together to form a conductive end, and then connected to the tab, and then connected to the stage post. At present, the tab welding method of laminated soft-packed lithium batteries generally uses ultrasonic welding to pre-weld the leading foils between the pole pieces to form a pre-welded foil, and then ultrasonically welds the tab metal with the pre-welded foil. The welding foils are welded together to achieve the purpose of welding. However, in the process of ultrasonic welding, since the thickness of the foil drawn from the pole piece is very small, generally around 0.02mm, the o...

AI Technical Summary

Problems solved by technology

This welding structure reduces the connection strength between the battery tab and the nickel strip, and is not suitable for the connection between the battery foil and the tab

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