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Method for welding battery tabs and busbar

A technology of a battery tab and a welding method, applied in the fields of welding and laser welding, can solve the problems of heavy weight, high processing cost of composite materials, poor welding strength, etc., and achieve the effects of simple structure, low cost, and reduced welding cost.

Inactive Publication Date: 2019-12-20
HANS LASER TECH IND GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the traditional laser welding method, the material of the bus bar must be the same or similar to that of the battery tab, otherwise the welding strength is poor and cannot meet the requirements of use. Therefore, the material of the bus bar needs to be made of copper-aluminum composite material
However, the processing cost of composite materials is high and the weight is large, which is not conducive to the lightweight of battery modules

Method used

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  • Method for welding battery tabs and busbar
  • Method for welding battery tabs and busbar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068]The battery tab 10 is bent and attached to the bus bar 20 , and the battery tab 10 and the bus bar 20 are connected as a whole through an outer frame support so that they are relatively fixed. The integrated battery tab 10 and the bus bar 20 are fixedly placed on a welding platform. The welding platform is moved so that the to-be-welded area 30 between the battery tab 10 and the bus bar 20 is placed at an initial welding position. The initial welding position makes one end of the region to be welded 30 correspond to the spot position of the laser beam of the laser welding device.

[0069] Wherein, the battery tab 10 is made of pure copper, and the bus bar 20 is made of pure aluminum.

[0070] A laser welding device is selected, wherein: the transmission fiber core diameter of the laser welding device is 10 μm, the optical amplification ratio of the laser beam is 1:1, and the output power of the laser is 500W.

[0071] The laser beam spot is welded along the curved traj...

Embodiment 2

[0073] The battery tab 10 is bent and attached to the bus bar 20 , and the battery tab 10 and the bus bar 20 are connected as a whole through an outer frame support so that they are relatively fixed. The integrated battery tab 10 and the bus bar 20 are fixedly placed on a welding platform. The welding platform is moved so that the to-be-welded area 30 between the battery tab 10 and the bus bar 20 is placed at an initial welding position. The initial welding position makes one end of the region to be welded 30 correspond to the spot position of the laser beam of the laser welding device.

[0074] Wherein, the battery tab 10 is made of pure aluminum, and the bus bar 20 is made of pure copper.

[0075] A laser welding device is selected, wherein: the transmission fiber core diameter of the laser welding device is 20 μm, the optical amplification ratio of the laser beam is 1:2, and the output power of the laser is 1200W.

[0076] The laser beam spot is welded along the curved tr...

Embodiment 3

[0078] The battery tab 10 is bent and attached to the bus bar 20 , and the battery tab 10 and the bus bar 20 are connected as a whole through an outer frame support so that they are relatively fixed. The integrated battery tab 10 and the bus bar 20 are fixedly placed on a welding platform. The welding platform is moved so that the to-be-welded area 30 between the battery tab 10 and the bus bar 20 is placed at an initial welding position. The initial welding position makes one end of the region to be welded 30 correspond to the spot position of the laser beam of the laser welding device.

[0079] Wherein, the battery tab 10 is made of pure copper, and the bus bar 20 is made of pure aluminum.

[0080] A laser welding device is selected, wherein: the transmission fiber core diameter of the laser welding device is 20 μm, the optical amplification ratio of the laser beam is 1:2, and the output power of the laser is 1500W.

[0081] The laser beam spot is welded along the curved tr...

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Abstract

The invention discloses a method for welding battery tabs and a busbar, and belongs to the technical field of laser welding. The method comprises the following steps: attaching the battery tabs to thebusbar and keeping the battery tabs relatively fixed; selecting a laser welding device, wherein the diameter of a transmission optical fiber core of the laser welding device is less than or equal to30 microns, the optical amplification ratio of a laser beam is 1: (1-3), and the output power of a laser is 500-2000W; and carrying out curve track welding on laser beam spots along to-be-welded areasof the battery tab and the bus bar, wherein the welding speed is more than or equal to 50 mm / s. By adopting smaller laser beam spots and higher welding speed, the welding time of a welded workpiece is short, few intermetallic compounds are generated, the welding strength between the workpieces is high, and the electric conductivity is high. The welding track of the curve stripes is adopted for laser welding, so that the welding track is increased, and the connecting area of welding seams is increased. The welding method reduces the welding cost of a battery module.

Description

technical field [0001] The embodiment of the present invention relates to a welding method, in particular to a laser welding method for battery tabs and busbars, which belongs to the technical field of laser welding. Background technique [0002] Soft-pack battery is a kind of battery packaged in aluminum-plastic film. It has the characteristics of flexible size design, high energy density, and light weight. It is widely used in 3C electronics and new energy automobile industries. The positive and negative electrodes are usually respectively Copper and aluminum material, thickness 0.2-0.6mm. The positive and negative electrodes of multiple pouch batteries are connected in series and / or in parallel to form a battery module, which becomes the basic power unit of electric vehicles and other electric facilities. [0003] When the tabs of multiple batteries are connected in series and / or in parallel, the tabs of the batteries are usually welded to thicker busbars respectively. ...

Claims

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Application Information

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IPC IPC(8): B23K26/21B23K26/70
CPCB23K26/21B23K26/702
Inventor 刘昊冯伟贤廖飞龙向小群胡勇雷鹏飞王培为徐作斌高云峰
Owner HANS LASER TECH IND GRP CO LTD
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