Fixture for diffusion welding, and diffusion welding method of copper nickel clad sheets

Abstract

The invention discloses a fixture for diffusion welding, and a diffusion welding method of copper nickel clad sheets, and relates to the technical field of welding. The fixture for diffusion welding comprises a first graphite pressing plate, a second graphite pressing plate and a plurality of positioning rods. A plurality of first positioning holes are formed in the first graphite pressing plate.The upper surface of the first graphite pressing plate is used for at least one copper pole piece and at least one nickel pole piece to be placed on. The second graphite pressing plate is located above the first graphite pressing plate. The copper pole piece and the nickel pole piece are located between the first graphite pressing plate and the second graphite pressing plate. A plurality of secondpositioning holes corresponding to the first positioning holes one to one are formed in the second graphite pressing plate. The second graphite pressing plate is used for tightly pressing the copperpole piece and the nickel pole piece under the action of external force. The multiple positioning rods are used for penetrating through the corresponding first positioning holes and the correspondingsecond positioning holes to carry out positioning. The fixture for diffusion welding is simple in structure; with the fixture for diffusion welding, the rejection rate in the welding process can be effectively lowered, and large-scale diffusion welding on copper nickel clad sheets can be achieved; and the fixture for diffusion welding is high in repeated utilization factor.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a fixture for diffusion welding and a diffusion welding method for a copper-nickel composite sheet. Background technique [0002] In today's society, with the improvement of people's living standards, the number of cars is also increasing year by year. Exhaust emissions caused by fuel vehicles are an important factor in environmental pollution. Therefore, new energy vehicles such as electric vehicles or hybrid vehicles emerge as the times require, and they represent a development direction of future automobiles. In electric vehicles, the core is the power battery pack as the power source. At present, the power batteries of electric vehicles generally use a large number of tens or even hundreds of single lithium batteries to form high-power lithium battery packs in series and parallel to meet the power requirements of electric vehicles. For the series and parallel connection b...

AI Technical Summary

Problems solved by technology

When connecting, weld the weldment on the nickel sheet to the positive pole or the negative pole of the battery pack. The disadvantages of the existing copper-nickel composite sheet are: the welding reliability is not strong, and the reject rate is too high during the welding process. Therefore, it is necessary to be improved

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