A laser welding method for power battery case

A power battery and shell technology, applied in the field of laser welding of power battery shells, can solve problems such as high economic cost and waste of resources, and achieve high energy utilization, reduce reflectivity, and smooth and uniform welds

Active Publication Date: 2017-10-03
WUHAN HGLASER ENG CO LTD
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Problems solved by technology

[0004] The purpose of the embodiment of the present invention is to provide a laser welding method for the casing of the power battery to solve the problems of high economic cost and waste of resources in the prior art

Method used

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  • A laser welding method for power battery case

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Embodiment 1

[0024] Embodiments of the laser welding method for the power battery casing provided by the present invention include:

[0025] In the embodiment of the present invention, the semiconductor laser used can be a fiber transmission type or a direct light output type, and the power range can meet the requirements of welding, and 2000w can be selected.

[0026] In the embodiment of the present invention, in step 1, the focus spot size requirement of the welding place is determined according to the weld seam width requirement of the power battery casing, and the fiber core diameter, focus lens focal length and collimator lens focal length of the semiconductor laser are selected according to the focus spot size requirement. :

[0027] The diameter D of the focused light spot is smaller than but close to the width d of the welding seam of the power battery casing, specifically 0.8d≤D

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Abstract

The present invention is applicable to the technical field of power battery casing welding, and provides a laser welding method for a power battery casing, which uses a semiconductor laser for welding. Step 1, determines the size of the focused spot at the weld according to the weld width requirements of the power battery casing. Select the parameters of the fiber core diameter of the semiconductor laser, the focal length of the focusing mirror, and the focal length of the collimating mirror according to the size of the focusing spot; step 2, tilt the laser welding head to keep a certain angle between the laser beam and the surface plane of the power battery casing; step 3, determine the welding The focus position of the focusing mirror and the distance between the focusing mirror and the power battery casing during the process; step 4, determine the laser power and welding speed of the semiconductor laser to weld the power battery casing. By using the semiconductor laser to weld the power battery shell, the weld seam is smooth and uniform, the energy utilization rate of the laser is high, and the welding speed is faster under the same power; it can well reduce the one-time input cost of the production enterprise.

Description

technical field [0001] The invention belongs to the technical field of power battery shell welding, and in particular relates to a laser welding method for a power battery shell. Background technique [0002] At present, environmental pollution and oil crisis are getting more and more serious, and automobile technology is undergoing major technological changes such as fuel diversification and power electrification. Electric vehicles with the advantages of high efficiency, energy saving, low emission or zero emission are an inevitable choice to solve the environmental crisis and the oil crisis, so they are highly valued by countries all over the world. The biggest bottleneck in the development of new energy vehicles is the vehicle power battery. The life and safety of the power battery play a vital role in the performance of new energy vehicles. The casing of the power battery is a crucial part of the power battery and plays the role of packaging. [0003] The traditional w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/21B23K26/14
CPCB23K26/20
Inventor 王建刚向发午
Owner WUHAN HGLASER ENG CO LTD
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