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Tab welding structure and tab welding method of flexibly packaged lithium ion power battery

A technology of tab welding and power battery, applied in structural parts, battery pack parts, circuits, etc., can solve the problems of unsatisfactory welding strength, small welding area, poor welding strength, etc., to avoid battery short-circuit and micro-short-circuit, The effect of improving the welding strength and avoiding the phenomenon of virtual welding

Inactive Publication Date: 2017-12-08
WANXIANG 123 CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The shortcomings of the existing flexible packaging lithium-ion power battery tab welding structure technical scheme are that the welding area of ​​the direct welding method is small and the welding strength is poor
[0005] Although the above-mentioned lug welding method has improved the welding fastness to a certain extent, the welding strength is still not ideal, and it is unavoidable to avoid metal shavings splashing on the lug glue and the battery core body at the current collector during the welding process

Method used

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  • Tab welding structure and tab welding method of flexibly packaged lithium ion power battery
  • Tab welding structure and tab welding method of flexibly packaged lithium ion power battery
  • Tab welding structure and tab welding method of flexibly packaged lithium ion power battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as image 3 As shown, a flexible packaging lithium-ion power battery tab welding structure includes a current collector 1 and a concave tab welding block; the concave tab welding block includes an upper tab welding leg 2, a tab lower welding leg 3, and The main body 4 and the ear piece 5. The upper lug leg and the lower lug leg are fixed at the same end of the lug main body, and the upper lug leg, the lower lug leg and one end of the lug body form a groove, the pole The ear gel blocks are arranged on the upper and lower end surfaces of the main body of the tab; the current collector is welded in the groove.

[0027] Wherein, the main body of the tab has a thickness of 0.35mm, the upper and lower tabs have a thickness of 0.25mm, and the upper and lower tabs are arranged in parallel with a distance of 0.25mm.

[0028] Such as Figure 1-3 As shown, the welding method of the tab welding structure of the flexible packaging lithium-ion power battery includes the follo...

Embodiment 2

[0033] Such as image 3 As shown, a flexible packaging lithium-ion power battery tab welding structure includes a current collector 1 and a concave tab welding block; the concave tab welding block includes an upper tab welding leg 2, a tab lower welding leg 3, and The main body 4 and the ear piece 5. The upper lug leg and the lower lug leg are fixed at the same end of the lug main body, and the upper lug leg, the lower lug leg and one end of the lug body form a groove, the pole The ear glue block is arranged on the upper and lower end surfaces of the main body of the ear; the current collector is welded in the groove.

[0034] Wherein, the thickness of the main body of the tab is 0.1 mm, the thickness of the upper and lower solder legs of the tab is 0.1 mm, and the upper solder leg of the tab and the lower solder leg of the tab are arranged in parallel with a distance of 0.1 mm.

[0035] Such as Figure 1-3 As shown, the welding method of the tab welding structure of the fl...

Embodiment 3

[0040] Such as image 3 As shown, a flexible package lithium-ion power battery tab welding structure, including a current collector 1, a concave tab welding block; the concave tab welding block includes a tab upper welding leg 2, a tab lower welding leg 3, a tab The main body 4 and the ear piece 5. The upper lug leg and the lower lug leg are fixed at the same end of the lug main body, and the upper lug leg, the lower lug leg and one end of the lug body form a groove, the pole The ear gel blocks are arranged on the upper and lower end surfaces of the main body of the tab; the current collector is welded in the groove.

[0041] Wherein, the thickness of the main body of the tab is 0.6 mm, the thickness of the upper and lower solder legs of the tab is 0.4 mm, and the upper solder leg of the tab and the lower solder leg of the tab are arranged in parallel with a distance of 0.4 mm.

[0042] Such as Figure 1-3 As shown, the welding method of the tab welding structure of the fle...

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Abstract

The invention relates to the preparation technical field of a lithium ion battery, and discloses a tab welding structure and a tab welding method of a flexibly packaged lithium ion power battery. The tab welding structure comprises a current collector (1) and a concave type tab welding block; the concave type tab welding block comprises a tab upper welding leg (2), a tab lower welding leg (3), a tab main body (4) and tab rubber blocks (5); the tab upper welding leg and the tab lower welding leg are fixed at the same end of the tab main body, and the tab upper welding leg and the tab lower welding leg and one end of the tab main body form a groove; the tab rubber blocks are arranged on the upper and lower end planes of the tab main body; and the current collector is welded to the groove. By virtue of the tab welding structure and the tab welding method provided by the invention, the welding area can be doubled and welding strength can be improved; and in addition, a phenomenon of cold solder joint can be avoided, the battery internal resistance can be lowered, the battery energy loss can be lowered, and safety in the welding process can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery preparation, in particular to a welding structure and a welding method for tabs of a soft-packed lithium-ion power battery. Background technique [0002] The existing technical solution for the tab welding structure of the soft-packed lithium-ion power battery is to directly weld the tab metal sheet and the battery current collector through an ultrasonic welding machine when welding the positive and negative tabs. [0003] The deficiencies of the existing technical solutions for the tab welding structure of the flexible packaging lithium-ion power battery lie in that the direct welding method has a small welding area and poor welding strength. In particular, it is prone to false welding. Increasing the internal resistance of the battery increases the energy loss of the battery. During the charging and discharging process of the battery, the temperature of the tab at the soldering poi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/26H01M50/531
CPCH01M50/531Y02E60/10
Inventor 谭歌李凡群韩笑
Owner WANXIANG 123 CO LTD
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