Lithium-ion battery laser welding sealing technology

A lithium-ion battery and laser welding technology, which is applied to laser welding equipment, welding equipment, battery pack components, etc., can solve problems such as low utilization rate of laser energy, unsightly weld appearance, and low welding depth, etc. The appearance is smooth, the appearance of the weld is smooth and beautiful, and the effect of fast welding speed

Inactive Publication Date: 2008-07-30
湖北盐光能源科技有限公司
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Problems solved by technology

Using this welding method, most of the laser energy is reflected by the surface of the battery aluminum shell, the welding depth is not deep, and the utilization rate of laser energy is low.
At the same time, in the traditional solid-state pulse laser welding of lithium-ion batteries, the appearance of the weld is a straight line formed by a series of overlapping concentric rings. This weld has an unsightly appearance and a breakdown phenomenon caused by unstable pulse energy.

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  • Lithium-ion battery laser welding sealing technology
  • Lithium-ion battery laser welding sealing technology
  • Lithium-ion battery laser welding sealing technology

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Embodiment Construction

[0013] The invention relates to a lithium-ion battery laser welding and sealing process, which performs sealing welding on a battery case 6 and a battery cover plate 8 of the lithium-ion battery. The welding process uses a fiber laser welding machine with an output frequency range of 600 Hz-20 kHz to perform continuous sealing welding between the battery case 6 and the battery cover 8 of the lithium-ion battery.

[0014] In this embodiment, the fiber laser welding machine adopts a fiber laser welding machine with a wavelength of 1090 nanometers. Compared with the pulse output mode of ordinary laser welding machines, this type of laser welding machine can continuously output laser energy. At the same time, its waveform output modes are diverse, and the applicable waveform of the material can be adjusted to obtain a large penetration ratio.

[0015] please compare figure 1 and figure 2 , figure 1 It is the welding pattern of the traditional lithium-ion battery solid-state la...

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Abstract

The invention relates to a laser beam welding and sealing technology for Li-ion battery, which realizes consecutive sealing weld to the battery shell and the battery cover of a Li-ion battery using a laser welder with 600 Hz to 20 KHz of output frequency. The laser beam welding and sealing technology for Li-ion battery of the invention carries out a consecutive sealing weld on the Li-ion battery by means of continuous output of laser energy or high frequency of the laser welder. The welding way can maintain the melting state of a welding seem all the time and push forward. The welding has the advantages of good welding effect as well as smooth and beautiful appearance; furthermore, the nugget zone in the welding centre is completely melted during welding; therefore, after cooling, the residual inter-stress of the welding joint is weak and bad phenomena such as cracking is avoided.

Description

【Technical field】 [0001] The invention relates to a lithium ion battery sealing process, in particular to a lithium ion battery continuous laser welding sealing process. 【Background technique】 [0002] The traditional lithium-ion battery laser welding seal adopts the solid pulse laser welding method. The solid pulse laser welding method is essentially spot welding, and each welding spot has 60% to 90% overlap. In this way, the multi-point overlapping method finally realizes line welding. . In traditional welding equipment, the highest pulse frequency is generally 50 Hz, and the welding speed is 6-8 mm / s. The shape of the molten pool formed by the spot welding is a parabolic shape with a large top and a small bottom. In the case of multiple spot welding overlapping, the penetration depth of the weld seam will be uneven. [0003] Moreover, pulse welding belongs to heat conduction welding. The laser is irradiated on the aluminum shell of the battery shell to heat up the surfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/20H01M2/00B23K26/24H01M50/169
CPCY02E60/10
Inventor 丁茗罗鸣
Owner 湖北盐光能源科技有限公司
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