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Welding method of battery cover plate

A welding method and battery cover technology, applied in welding equipment, laser welding equipment, battery pack components, etc., can solve problems such as deformation and shell deformation, and achieve improved safety in use, full molding, and avoid damage to cells Effect

Active Publication Date: 2021-07-27
CHINA AVIATION LITHIUM BATTERY RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the welding process of the cover plate and the case of this type of battery, the workpiece to be welded will be deformed by the uneven temperature field, and the thinner the case, the more serious the deformation

Method used

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  • Welding method of battery cover plate
  • Welding method of battery cover plate
  • Welding method of battery cover plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] refer to figure 1 , which representatively shows the positions of two consecutive weldings on the cover plate 100 and the casing 200 of the battery cover plate welding method proposed by the present invention. In this exemplary embodiment, the method for welding the battery cover plate proposed by the present invention is described by taking the application of welding the aluminum shell of the vehicle battery and the cover plate 100 as an example. Those skilled in the art can easily understand that, in order to apply the related design of the present invention to the cover plate welding process of other types of batteries, various modifications, additions, substitutions, deletions or modifications are made to the following specific embodiments. Other variations, which are still within the scope of the principle of the welding method of the battery cover plate proposed by the present invention.

[0026] Such as figure 1 As shown, in this embodiment, the welding method ...

Embodiment 2

[0048] Based on the above detailed description of the first embodiment of the battery cover welding method proposed in the present invention, the second embodiment of the battery cover welding method proposed in the present invention will be described below. refer to figure 2 , which representatively shows the welding method of the battery cover plate proposed by the present invention, and a schematic diagram of the positions of two consecutive weldings on the cover plate 100 and the casing 200 in the second embodiment. The following will combine figure 2 , the design of the welding method in the second embodiment that is different from that in the first embodiment will be described.

[0049] Optionally, as in figure 2 As shown, in this embodiment, in the step of performing the first continuous welding along the connection area between the cover plate 100 and the housing 200, the position A1 of the welding beam (such as a laser beam) can be aligned with the cover plate 10...

Embodiment 3

[0065] Based on the above detailed description of the first embodiment and the second embodiment of the battery cover welding method proposed by the present invention, the third embodiment of the battery cover welding method proposed by the present invention will be described below. refer to image 3 , which representatively shows the welding method of the battery cover plate proposed by the present invention, and a schematic diagram of positions of two consecutive weldings on the cover plate 100 and the casing 200 in the third embodiment. The following will combine image 3 , the design of the welding method in the third embodiment is different from that of the first embodiment and the second embodiment.

[0066] Optionally, as in image 3 As shown, in this embodiment, in the step of performing the first continuous welding along the connecting area between the cover plate 100 and the housing 200, the position A1 of the welding beam can be aligned with the position of the co...

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Abstract

The invention relates to the technical field of battery production and manufacturing processes, in particular to a welding method of a battery cover plate. The welding method comprises the steps that at least two times of continuous welding are carried out along a connecting area of the cover plate and a shell correspondingly, wherein the welding power of the first-time continuous welding is smaller than that of the second-time continuous welding; and the laser welding power, the welding speed and the defocusing amount are adjusted, wherein the deformation amount of the shell is smaller than or equal to 0.6 mm after first-time continuous welding is carried out, and the deformation amount of the shell is smaller than or equal to 1.0 mm after second-time continuous welding is carried out. By means of the design, according to the welding method of the battery cover plate, insufficient welding and discontinuous welding of the appearance of a weld joint can be avoided through the first-time welding process; and meanwhile, due to the fact that first-time welding with small power is adopted, battery cell damage caused by the fact that the shell is welded through can be avoided through second-time welding with large power, shell deformation after welding is effectively relieved, a formed weld joint area is full in forming and high in strength, and the weld width and the weld penetration depth meet the requirements.

Description

technical field [0001] The invention relates to the technical field of battery production and manufacturing technology, in particular to a welding method for a battery cover plate. Background technique [0002] Most of the power battery shells of new energy electric vehicles are made of aluminum shells. The price of aluminum shells is slightly higher than that of steel shells. However, aluminum shells have abundant resources, large construction scale, advanced technology, small environmental impact, energy saving and emission reduction, and profitability. high ability. During the manufacturing and assembly process of square aluminum shell lithium batteries, laser welding technology needs to be applied. Laser welding has the advantages of high energy density, high precision, and stable power, and plays an irreplaceable role in the production and assembly process of square aluminum shells. Top cover sealing laser welding is a packaging process in which the cover plate and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/21B23K26/70
CPCB23K26/21B23K26/70B23K2101/36H01M50/169B23K26/0604B23K26/067B23K26/206B23K26/242B23K26/28B23K26/32B23K2101/04B23K2103/10B23K31/003Y02E60/10B23K26/042B23K26/0626B23K26/24
Inventor 曾天行宋乳昕李晓坡樊彦良
Owner CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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