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Laser welding technology of automobile power battery aluminum alloy shell

A technology for automobile power battery and aluminum alloy shell, which is applied in the field of laser welding technology of automobile power battery aluminum alloy shell, can solve the problems of low production efficiency, large linear expansion coefficient, increased heat input, etc., and achieves cost saving and tensile strength. Good, increase the effect of welding aspect ratio

Inactive Publication Date: 2015-11-11
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] 1) Industrial pure aluminum (1 series, 3 series aluminum alloy) has large thermal conductivity and large linear expansion coefficient. Traditional welding methods need to increase heat input or overall heating, which may easily lead to defects such as undercutting and warping deformation;
[0013] 2) Due to the need to increase heat input or overall heating, the energy consumption is large and the production efficiency is low;
[0014] 3) In the traditional welding method, because the linear expansion coefficient of aluminum is about twice that of carbon steel and low alloy steel, the volume shrinkage rate during solidification is about 6.5%. At the same time, the welding interface is flat and the heat input is large, so it is easy to hot crack

Method used

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  • Laser welding technology of automobile power battery aluminum alloy shell
  • Laser welding technology of automobile power battery aluminum alloy shell
  • Laser welding technology of automobile power battery aluminum alloy shell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as figure 2 As shown, the workpiece 35 to be welded is a 1-series aluminum alloy with a thickness of 1.2mm, and a weld 33 is provided at the junction. The Nd:YAG solid-state pulse laser used for welding has a maximum power of 1000W and a peak power of 10KW. The minimum spot diameter is 0.6mm, the pulse width range is 1-10ms, the laser wavelength is 1.064μm, the laser power instability is ≤3%, and the focal length f of the focusing element is 80mm. The laser light emitted by the laser is transmitted by optical fiber and focused to the weld seam. The workpiece 35 to be welded moves in the horizontal plane and the laser beam 31 does not move so that the laser beam 31 scans the weld seam 33 at a speed of 2.1 mm / s to realize the workpiece 35 to be welded. of welding. During the welding process, an appropriate Ar gas flow is used to purge the welding melting pool 34 through the shielding gas nozzle 32 to protect the welding seam 33 from oxidation. The laser spot diame...

Embodiment 2

[0040] The workpiece 35 to be welded is a 3-series aluminum alloy with a thickness of 0.8 mm. The same laser welding equipment is used at the same welding speed. The main purpose of this example is to investigate the power selection in the preheating and heat preservation stages, which includes 6 specific implementations.

[0041] In this embodiment, the powers of preheating and heat preservation are the same, and its parameters are the same as those in Embodiment 1, the difference is that the power of preheating and heat preservation is adjusted within the range of 2-6KW, specifically, the power is 0-6KW. 1, 1~2, 2~3, 3~4, 4~5, 5~6kw, such as Figure 4 As shown, the red dot represents the final power, the abscissa is the power of preheating and heat preservation, and the ordinate is the result of the tensile strength test. The tensile strength data is tested according to the tensile test method of GB / T2652-1989 welding seam and deposited metal ( N / mm 2 ).

[0042] One of t...

Embodiment 3

[0048] This embodiment is a series 1 aluminum alloy with a thickness of 1.2mm. The same laser welding equipment is used at the same welding speed. The main purpose is to investigate the power selection in the heating stage, which includes 6 specific implementations, and its relevant experimental parameters are the same as in Example 1, and the difference is that the peak power in the heating stage is different. Such as Figure 5 and Figure 6 as shown, Figure 5 The weld depth data at 6, 6.5, 7, 7.5, 8, 8.5kw peak power are given in Figure 6 The weld width data at 6, 6.5, 7, 7.5, 8, 8.5kw peak power are given.

[0049] pass Figure 5 It can be seen that when the heating laser power is 6KW, due to the low energy, the sample is only a weld seam formed after a small amount of melting and solidification on the front side, which is not penetrated and uneven. With the increase of laser power, the weld seam morphology tends to be uniform, the weld width and penetration depth ar...

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Abstract

The invention discloses a laser welding technology of an automobile power battery aluminum alloy shell. According to the technology, under the protection of inert gases, a welding line of aluminum alloy is welded in a laser brazing manner. The pulse width of the laser ranges from 3 ms to 7 ms. A preheating stage, a heating stage and an insulating stage are included in the pulse range, wherein the preheating stage is not smaller than 1 ms, the heating stage is not smaller than 1 ms, and the insulating stage is not smaller than 1 ms. The power of the preheating stage and the power of the insulating stage range from 3 kw to 4 kw. The power of the heating stage is increased and then reduced, and the peak power ranges from 6 kw to 8.5 kw. The laser welding technology of the automobile power battery aluminum alloy shell is superior in tensile performance.

Description

technical field [0001] The invention relates to the field of manufacturing automobile power battery casings, in particular to a laser welding process for the aluminum alloy casing of automobile power batteries. Background technique [0002] The invention relates to a laser welding waveform of an industrial pure aluminum shell of an automobile lithium ion battery, belonging to the field of automobile power battery manufacturing. [0003] Lithium-ion batteries have attracted much attention due to their high specific energy, low self-discharge, long cycle life, no memory effect and environmental protection. The development momentum of lithium-ion batteries is extremely rapid. Lithium-ion batteries have been used in notebook computers, mobile phones, VCRs, small medical equipment, motorcycles, bicycles, cameras, and other fields, the application research of lithium-ion batteries in electric vehicles, aviation, aerospace, navigation, and military fields is also being actively car...

Claims

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Application Information

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IPC IPC(8): B23K1/005
CPCB23K1/0056
Inventor 郭亮眭敏张庆茂郭永强张卫许建波王业伟
Owner SOUTH CHINA NORMAL UNIVERSITY
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