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.