Welding method and device of lithium battery electrode lug

A technology of tab welding and welding device, applied in welding equipment, non-electric welding equipment, laser welding equipment, etc., can solve the problems of insufficient welding stability, short circuit of battery cells, hidden safety hazards, etc., so as to improve battery performance and reduce battery cell performance. Internal resistance, the effect of improving safety
CN105364296AInactive Publication Date: 2016-03-02慈溪市双佳电器有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
慈溪市双佳电器有限公司
Publication Date
2016-03-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a welding method of a lithium battery electrode lug. A lithium battery comprises the electrode lug, an electrode piece and a cap, wherein one end of the electrode lug is stuck in the middle of the electrode piece through high temperature glue, then the electrode lug and the electrode piece are welded through ultrasonic soldering, and the other end of the electrode lug is welded to the lower portion of the cap through laser welding. The invention further discloses a welding device used for accurate welding between the electrode lug and the cap. The electrode lug is welded through the high temperature glue and ultrasonic waves, the sticking stability between the electrode lug and the electrode piece is improved, the electrode lug is located in the middle of the electrode piece, the bending space of the electrode lug is greatly improved, the probability of contact of the electrode lug and the inner wall of a battery shell if the electrode lug is too long is reduced, and safety is improved. The internal resistance of a battery cell can be effectively reduced, and the battery performance is improved. The welding device is adopted for welding between the electrode lug and the cap, so that the welding efficiency is improved, and welding between the cap and the electrode lug is more accurate through a limiting rod, a shell fixing device and a fixing clip.
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Description

technical field

[0001] The invention relates to the field of lithium battery processing, in particular to a lithium battery tab welding method and a welding device thereof. Background technique

[0002] Lithium batteries have the characteristics of high specific energy, low self-discharge rate, good high and low temperature performance, long charge and discharge life, and no memory effect. At present, it is widely used in mobile phones, notebook computers, digital cameras, electric vehicles, electric tools and new energy vehicles and other products. At present, one end of the tab of a lithium battery is welded to one end of the pole piece, and is wound and put into a cylindrical battery case. The tab is located in the middle of the battery case, and the other end of the tab is welded to the cap. This welding This method can easily lead to the contact between the tab and the inner wall of the battery case after the cap and the battery case are closed, resulting in a short ci...

Claims

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