Method for ultrasonic welding of copper thin plate and nickel thin plate

A technology of ultrasonic welding and copper thin plate, which is applied in welding equipment, welding/welding/cutting items, non-electric welding equipment, etc. It can solve the problems of short welding time, small welding energy, and non-welding, so as to improve mechanical properties and electrical conductivity performance, increase the welding area, and meet the performance requirements

Active Publication Date: 2020-10-30
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the commonly used welding methods such as electron beam welding, plasma welding, and laser welding can weld copper sheets and nickel sheets, these methods will melt the base metal, causing the grain size of the weld and heat-affected zone to grow. Orientation changes, which will lead to a decrease in the electrical conductivity and mechanical properties of the copper / nickel joint. How to weld the copper sheet to the nickel sheet without substantially changing the grain size and grain orientation of the base material is a difficult problem
[0003] Ultrasonic welding has the advantages of short welding time and low welding energy, and is now widely used in welding copper sheets and nickel sheets. However, due to the specific tooth pattern on the surface of the welding head of the ultrasonic metal welding machine, it is easy to cause a gap between the tines. An unwelded area will be produced at the welding interface below the part, which will affect the electrical conductivity and mechanical properties of the joint; therefore, it is urgent to adopt a welding method that can increase the welding area of ​​the ultrasonic welding copper sheet / nickel sheet interface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for ultrasonically welding a copper sheet and a nickel sheet, taking the copper sheet and the nickel sheet to be welded, wherein the copper sheet is a T2 copper sheet with a thickness of 0.3mm, and the thickness of the nickel sheet is pure nickel with a thickness of 0.3mm For the thin plate, before coating the middle layer of nano-nickel formate particles, immerse the copper thin plate and nickel thin plate in a dilute hydrochloric acid solution with a concentration of 4.5% and clean it for 6 minutes, then clean it with pure alcohol and dry it;

[0019] Subsequently, the surface of the aluminum sheet to be welded is coated with nano-nickel formate particles to form an intermediate layer by printing, the particle size of the nano-nickel formate particles is 25nm, and the thickness of the intermediate layer is 25 μm;

[0020] The copper thin plate is an upper weldment, which is in direct contact with the welding head, and the nickel thin plate is a lower weldment,...

Embodiment 2

[0023] A method for ultrasonically welding a copper sheet and a nickel sheet, taking the copper sheet and the nickel sheet to be welded, wherein the copper sheet is a T2 copper sheet with a thickness of 0.5mm, and the thickness of the nickel sheet is pure nickel with a thickness of 0.7mm For the thin plate, before coating the middle layer of nano-nickel formate particles, immerse the copper thin plate and nickel thin plate in a 5% dilute hydrochloric acid solution to clean for 7 minutes, then clean it with pure alcohol and dry it;

[0024] Coating nano-nickel formate particles on the surface of the aluminum sheet to be welded by printing to form an intermediate layer, the particle size of the nano-nickel formate particles is 20nm, and the thickness of the intermediate layer is 20 μm;

[0025] The copper thin plate is an upper weldment, which is in direct contact with the welding head, and the nickel thin plate is a lower weldment, which is in direct contact with the cutting boa...

Embodiment 3

[0028] A method for ultrasonically welding a copper sheet and a nickel sheet, taking the copper sheet and the nickel sheet to be welded, wherein the copper sheet is a T2 copper sheet with a thickness of 0.9mm, and the thickness of the nickel sheet is pure nickel with a thickness of 1.1mm For the thin plate, before coating the intermediate layer of nano-nickel formate particles, immerse the copper thin plate and the nickel thin plate in a 7% dilute hydrochloric acid solution for cleaning for 9 minutes, then clean it with pure alcohol and dry it in the air;

[0029] Coating nano-nickel formate particles on the surface of the aluminum sheet to be welded by printing to form an intermediate layer, the particle size of the nano-nickel formate particles is 18nm, and the thickness of the intermediate layer is 22 μm;

[0030] The copper thin plate is an upper weldment, which is in direct contact with the welding head, and the nickel thin plate is a lower weldment, which is in direct con...

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Abstract

The invention discloses a method for ultrasonic welding of a copper thin plate and a nickel thin plate. The method comprises the steps that the portion between the to-be-welded copper thin plate and the to-be-welded nickel thin plate is coated with nano nickel formate particles to form a middle layer with the thickness of 15-45 microns; before the middle layer is coated, the copper thin plate andthe nickel thin plate are immersed in a dilute hydrochloric acid solution with the concentration of 4.5%-8.8% to be washed for 5-10 minutes, and then the middle layer is cleaned with pure alcohol andair-dried; and the copper thin plate and the nickel thin plate coated with the nano nickel formate particles as the middle layer are subjected to ultrasonic welding for 0.20-0.75 seconds at the welding pressure of 30-60 psi, wherein the welding amplitude is 25-55 microns. According to the method, the nano nickel formate particles are used as the middle layer to assist ultrasonic welding of the copper thin plate and the nickel thin plate, the maximum shearing strength can reach 2898 N, the joint resistance is less than 102 microhm, the mechanical property and conductive performance of a joint are improved, and the requirement of the automobile power battery industry for ultrasonic welding of copper / nickel joints can be met.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for ultrasonically welding a copper thin plate and a nickel thin plate. Background technique [0002] Copper and nickel can be used as conductor materials for automotive power batteries and battery packs, so there is inevitably a welded joint between copper sheets and nickel sheets. As conductor materials, copper sheets and nickel sheets have specific grain sizes and grain orientations, so During the welding process, try not to damage the specific structure of the base metal. Although the commonly used welding methods such as electron beam welding, plasma welding, and laser welding can weld copper sheets and nickel sheets, these methods will melt the base metal, causing the grain size of the weld and heat-affected zone to grow. Orientation changes, which will lead to a decrease in the electrical conductivity and mechanical properties of the copper / nickel joint. How to ...

Claims

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Application Information

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IPC IPC(8): B23K20/10B23K20/16B23K20/24B23K103/18
CPCB23K20/10B23K20/16B23K20/24B23K2103/18
Inventor 倪增磊杨嘉佳彭进高志廷郝用兴仝玉萍李帅王星星崔大田范以撒黄亮
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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