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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

Inactive Publication Date: 2016-03-02
慈溪市双佳电器有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 circuit of the battery cell, which has certain safety hazards, and the welding stability between the tab and the pole piece is not enough. prone to falling off

Method used

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  • Welding method and device of lithium battery electrode lug
  • Welding method and device of lithium battery electrode lug
  • Welding method and device of lithium battery electrode lug

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] like figure 1 As shown, the present invention provides a method for welding tabs of a lithium battery. The lithium battery includes a tab 1, a pole piece 2 and a cap. One end of the tab is glued to the middle of the pole piece by high temperature glue, and then ultrasonic It is welded to the pole piece by welding, and the other end of the pole lug is welded under the cap by laser welding.

[0020] The tab is glued to the middle of the pole piece by high-temperature glue, and then welded by ultrasonic welding, which improves the bonding stability between the tab and the pole piece, and the tab is located in the middle of the pole piece, and the tab is located outside the pole piece after winding. When the cap is pressed on the battery case, the bending space of the tab is greatly improved, reducing the probability of contact with the inner wall o...

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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.

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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Application Information

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IPC IPC(8): B23K20/10B23K26/21
CPCB23K20/10B23K26/20B23K2101/36
Inventor 孙良通王一蔡泽方时科杨万鹏邹自波
Owner 慈溪市双佳电器有限公司
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