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Welding structure and welding method of foil and cover plate

A technology of welding structure and welding method, which is applied in the field of welding of foil and cover, can solve the problems of poor connection between foil and cover, easy to break, etc., so as to improve the welding surface effect, excellent welding quality, and improve production yield. Effect

Pending Publication Date: 2022-05-27
惠州市隆合科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the junction between the foil and the molten pool is easy to break in the welding of the foil and the cover in the existing lithium ion battery, resulting in poor connection between the foil and the cover, the present invention provides a welding method between the foil and the cover. welded structure

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  • Welding structure and welding method of foil and cover plate
  • Welding structure and welding method of foil and cover plate
  • Welding structure and welding method of foil and cover plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] The welding of the foil and the cover plate in this embodiment is as follows.

[0082] Number of foil layers: 76 layers.

[0083] Welding method: Laser welding machine of model YLR-2000-SM ​​is used for penetration welding, and a long welding seam (ie, the second welding seam 302) is directly welded on the surface of the foil 1, and the welding speed of the welding seam is 300mm / s , the welding power is 1250W, and a weld with a molten pool penetration depth of 0.45mm and a fusion width of 2.39mm is formed.

[0084] The tomographic inspection of the welded seam structure is carried out. The observation diagram of the molten pool of the welded structure, the observation diagram of the left fault, and the observation diagram of the right fault are as follows: Figure 6a , Figure 6b , Figure 6c The observation results show that there are obvious faults after welding between the molten pool, the foil and the cover plate, and the number of faults on the left and right si...

Embodiment 2

[0086] The welding of the foil and the cover plate in this embodiment is as follows.

[0087] Number of foil layers: 76 layers.

[0088] Welding method: use laser welding machine model YLR-2000-SM ​​to penetrate through welding, and weld several first welds 301 on the surface of the foil 1; Preheat the welding seam 303 ; and then weld the second welding seam 302 on the surface of the preheating welding seam 303 .

[0089] Among them, the welding speed of the first welding seam 301 is 250mm / s, the welding power is 800W; the seam width of the first welding seam 301 is 0.4-0.6mm, the penetration depth is 0.2-0.3mm; the speed of preheating before welding is 300mm / s, the power is 1200W, the instantaneous temperature after preheating is completed is 60-120°C; the welding speed of the second welding seam 302 is 300mm / s, and the welding power is 1250W. see Figure 7 As shown, the included angle between the first welding seam 301 and the second welding seam 302 is 30°.

[0090] A ...

Embodiment 3

[0092] The welding of the foil and the cover plate in this embodiment is as follows.

[0093] Number of foil layers: 76 layers.

[0094]Welding method: use laser welding machine model YLR-2000-SM ​​to penetrate through welding, and weld several first welds 301 on the surface of the foil 1; Preheat the welding seam 303 ; and then weld the second welding seam 302 on the surface of the preheating welding seam 303 .

[0095] Among them, the welding speed of the first welding seam 301 is 250mm / s, the welding power is 800W; the seam width of the first welding seam 301 is 0.4-0.6mm, the penetration depth is 0.2-0.3mm; the speed of preheating before welding is 300mm / s, the power is 1200W, the instantaneous temperature after preheating is completed is 60-120°C; the welding speed of the second welding seam 302 is 300mm / s, and the welding power is 1250W. see Figure 9 As shown, the included angle between the first welding seam 301 and the second welding seam 302 is 45°.

[0096] A w...

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Abstract

The invention discloses a welding structure and a welding method of a foil and a cover plate. The welding structure of the foil and the cover plate comprises the foil and the cover plate which are connected through a welding seam. The welding seams comprise a plurality of first welding seams and second welding seams; the first welding seam and the second welding seam are not parallel and form an included angle; furthermore, the welding seam is further provided with a preheating welding seam, and the preheating welding seam at least partially coincides with the first welding seam and the second welding seam. Therefore, the problem of foil breakage after the foil and the cover plate are welded is solved, the welding quality of the foil and the cover plate is improved, air holes in a molten pool are reduced, the surface morphology of a weld joint is optimized, and the welding quality is improved. According to the welding method of the foil and the cover plate, the foil and the cover plate are welded through laser welding, the welding structure comprising the first welding seam and the second welding seam is formed, preheating before welding can be further conducted, and therefore the welding structure of the foil and the cover plate with the excellent welding quality is produced and obtained, and the production yield of lithium ion batteries is increased.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery production, in particular to the welding of a foil material and a cover plate. Background technique [0002] In lithium-ion batteries, the multilayer foil and cover are welded by laser. However, in the existing laser welding method, the interface between the multi-layer foil and the molten pool is prone to fracture after welding, resulting in poor connection between the multi-layer foil and the cover plate. As a result, the overcurrent of the battery is affected, which eventually leads to internal heating and short circuit of the battery, reduction of battery capacity, reduction of battery life, and battery scrapping during use. Safety hazards and abnormal quality problems. [0003] Moreover, since the surface of the molten pool after laser welding is smooth and flat, the quality of the interior of the molten pool cannot be judged by conventional detection methods, and the fault cause...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K33/00B23K26/24B23K26/60
CPCB23K33/004B23K26/24B23K26/60Y02E60/10
Inventor 翁玉飞樊泽陆满江廖飞龙
Owner 惠州市隆合科技有限公司
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