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Method for repairing various welding seam defects of laser welding of power battery sealing nails

A laser welding and power battery technology, applied in laser welding equipment, welding equipment, battery pack components, etc., can solve the problems of cell voltage resistance and sealing performance failure, cell scrapping, etc., to repair welding seam defects, Low cost and flexible operation

Inactive Publication Date: 2020-04-21
WUHU ETC BATTERY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These defects will cause the cell's pressure resistance and sealing performance to fail, resulting in the cell being scrapped

Method used

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  • Method for repairing various welding seam defects of laser welding of power battery sealing nails
  • Method for repairing various welding seam defects of laser welding of power battery sealing nails
  • Method for repairing various welding seam defects of laser welding of power battery sealing nails

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for repairing multiple defects of power battery sealing nail laser welding, the steps are as follows:

[0035] Step 1. Use a Φ7mm milling cutter to mill grooves at the pinhole position of the original sealing aluminum nail and the welding seam of the cell top cover. The milling cutter sinks 0.8mm to remove the defective weld seam;

[0036] Step 2, use alcohol and a metal brush to clean the milled groove comprehensively, first clean the milled groove 3 with a metal brush, and then wipe the groove 3 with alcohol; preferably, a metal brush is an electric metal brush;

[0037] Step 3. Use a 40w laser to clean the surface of the groove at 1200mm / s;

[0038] Step 4. Put the custom-made new aluminum nail with a diameter of 7mm and a thickness of 0.8mm into the milled groove, and then put the battery into the laser welding equipment, with a power of 6.3kW and a welding speed of 6mm / s, +0.3mm The amount of defocus, laser sealing welding is performed again.

Embodiment 2

[0040] A method for repairing multiple defects of power battery sealing nail laser welding, the steps are as follows:

[0041] Step 1. Use a Φ8mm milling cutter to mill grooves on the original sealing aluminum nail and the weld pit of the top cover. The milling cutter sinks 0.7mm to remove the defective weld;

[0042] Step 2, use alcohol and a metal brush to clean the milled groove comprehensively, first clean the milled groove 3 with a metal brush, and then wipe the groove 3 with alcohol; preferably, a metal brush is an electric metal brush;

[0043] Step 3. Use a 38w laser to clean the surface of the groove at 1100mm / s;

[0044] Step 4. Put the custom-made new aluminum nail with a diameter of 8mm and a thickness of 0.7mm into the milled groove, and then put the battery into the laser welding equipment, with a power of 6.5kW and a welding speed of 6mm / s, +0.4mm The amount of defocus, laser sealing welding is performed again.

[0045] The invention removes the original defe...

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Abstract

The invention discloses a method for repairing various welding seam defects of laser welding of power battery sealing nails, which comprises the steps of firstly, milling a groove in a welding seam ofan original sealing nail on a battery cell top cover by using a milling cutter, and removing the defect position of welding; secondly, comprehensively cleaning the milled groove by using alcohol andan electric brush, wherein the specific operation process is as follows: the groove is cleaned after being milled, the milled groove is cleaned by using the electric brush firstly, and then the grooveis wiped by using alcohol; thirdly, conducting laser cleaning on the cleaned groove; and fourthly, putting a new sealing nail made of the same material in the milled groove, and conducting laser sealing welding again. According to the invention, the nail is placed and welded again after groove milling, and groove milling is conducted through the milling cutter to integrally remove the defect position of welding; and the state before welding is restored, the sealing welding is completed again so as to achieve the effect of effectively repairing the welding seam defect.

Description

technical field [0001] The invention belongs to the technical field of power batteries, and in particular relates to a method for repairing various welding seam defects of power battery sealing nails laser welding. Background technique [0002] Due to its high energy density, high safety performance, low self-discharge performance and long cycle life, lithium-ion batteries are widely used in electronic equipment and electric vehicles. They are a new type of clean secondary energy with broad industry prospects. . [0003] At present, the final sealing after the liquid injection of the square lithium-ion power battery adopts the laser welding of the aluminum alloy disc (sealed aluminum nail) and the liquid injection hole of the top cover. Due to the impurities and oil stains of the aluminum nails, as well as the shortcomings of the laser welding process, there will be weld depressions, protrusions, pinholes, cracks, polarization, and burning nails during the welding process. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/24B23K26/60H01M2/36
CPCB23K26/24B23K26/60B23K2101/36H01M50/636Y02E60/10
Inventor 彭程
Owner WUHU ETC BATTERY LTD
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