Multi-layer superimposed tab high-excitation ultrasonic welding method and system

Abstract

The invention discloses a method and system for multi-layer superimposed tab high-excitation ultrasonic welding. f =20 kHz three-quarter-wavelength cylindrical horn combined with a quarter-wavelength welded die head to form a full-wavelength longitudinal resonance system. The vibration system moves up and down driven by the welding cylinder, and together with the stripping plate in the stripping system is driven by the PLC control system to complete the tab welding process. The pole piece transfer plate in the welding system can continuously correct and position the welding workpiece through its groove structure, which in turn increases the welding accuracy and welding effect of the tab. The U-shaped groove and shaping pressure plate shown in the stripping plate in the stripping system can simultaneously complete the shaping of the pole piece before welding and the stripping operation after welding. The lug welding system shown in the present invention has the advantages of compact overall structure, stable output of high-frequency vibration energy, complete functions, convenient installation and low cost, and is easy to popularize and implement.

Description

Technical field: [0001] The invention relates to a lithium battery tab ultrasonic welding processing device, in particular to a multi-layer stacked tab with functions such as self-correction of the welding position, shaping (flattening) of the welding surface of the tab, and demoulding. High excitation vibration ultrasonic welding method and system. Background technique: [0002] According to the internal energy storage structure of the lithium battery, the core component of the energy storage of the lithium battery is the pole piece, and the end of the pole piece is called the "pole ear". The tabs are commonly referred to as the ears of the positive and negative poles of the battery, which lead out the positive and negative poles from the battery cell, and work as contact points when the battery is charged and discharged. However, for the existing tab welding process, there are still the following shortcomings that need to be improved: 1. When welding the tab, it is necess...

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Problems solved by technology

However, for the existing tab welding process, there are still the following shortcomings that need to be improved: 1. When welding the tab, it is necessary to keep the welding surface flat, otherwise the welding effect will be reduced and its service performance will be affected

2. Whether the welding position of the tab is correct or not is related to the welding quality and welding effect of the tab; however, the existing equipment usually only performs one or two deviation corrections when correcting the position, so it is difficult to ensure the accuracy of the welding position in the entire welding process

3. Among the existing processing equipment, pole piece welding deviation correction equipment, pole piece transmission equipment and welding shaping equipment are usually designed and assembled separately; however, due to the influence of installation errors, the quality and efficiency of pole piece welding can be affected to a certain extent

4. Existing lug welding is usually extrusion welding of single-layer copper or aluminum foil and nickel or aluminum sheet. At present, there are few multi-layer foil ultrasonic welding technologies and processes

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