Haifei copper busbar diffusion bonding equipment is developed for joining laminated copper foils and manufacturing flexible conductive connectors used in EV battery packs, energy storage systems, switchgear, transformers and other electrical assemblies.
Unlike a vacuum diffusion furnace, this equipment uses a medium-frequency power source, a high-current secondary circuit, graphite tooling and axial pressure to heat and consolidate the selected area of a copper foil stack. The process forms a compact end without adding solder or brazing filler, allowing the bonded section to be drilled, punched, bent or connected to another conductor in a later operation.
The machine is not selected from the busbar width alone. Individual foil thickness, number of layers, total stack thickness, bonded dimensions, required end thickness and production rate all affect the required heating capacity and pressure system.
For this reason, Haifei configures each copper diffusion bonding machine after reviewing the customer's drawing and, where possible, testing the actual production material.
What Is This Equipment Designed to Produce?
The equipment is primarily intended for flexible conductive parts made by stacking multiple layers of copper foil and consolidating one or more defined sections.
Suitable workpieces may include:
- Laminated copper foil flexible busbars;
- Battery pack flexible connectors;
- Energy storage copper busbars;
- Switchgear flexible conductors;
- Transformer copper foil connectors;
- Copper foil expansion joints;
- Flexible copper links with compacted ends;
- Copper foil components requiring punching after bonding;
- Selected copper-to-nickel conductive structures.
The bonded area becomes a compact section while the unbonded foil remains flexible. This structure allows the finished busbar to accommodate vibration, assembly tolerance and thermal movement while maintaining a conductive connection between rigid components.
Suitability must still be confirmed from the complete workpiece structure. Copper grade, surface coating, foil thickness and the size of the consolidated area can change the required machine configuration.
Common Copper Busbar Applications
EV Battery Pack Flexible Connectors
Battery packs often use laminated copper foil connectors between busbars, modules or electrical distribution components. The flexible section helps absorb vibration and dimensional variation during assembly.
01
Energy Storage Busbars
Energy storage cabinets and battery modules may require flexible copper connections between battery units, contactors and power-distribution assemblies.
These workpieces can have different widths, stack thicknesses and end structures within the same project. The machine must therefore provide sufficient working space and allow practical graphite-tooling changes when several busbar specifications are produced.
02
Switchgear Flexible Conductors
Low-voltage and medium-voltage switchgear use flexible conductors to connect moving contacts, circuit breakers, busbar systems and other conductive components.
The required machine depends on the current-carrying capacity, conductor dimensions and connection design. When a customer produces several switchgear ratings, HAIFEI reviews the complete product range before deciding whether one machine and several tooling sets can cover the work.
03
Transformer Copper Foil Connections
Laminated copper connectors can be used where transformers, reactors or power components require a flexible connection between a winding terminal and a rigid conductor.
In addition to the bonding area, the engineer should check the overall part length, loading direction and whether the workpiece must be bent before or after welding.
04
Copper-to-Nickel Conductive Parts
Selected copper foil and nickel sheet combinations can be evaluated when nickel is required at the contact or connection area.
The nickel grade, thickness, overlap structure and required joint test must be provided before the machine configuration is confirmed. Copper-only parameters should not be used directly for a copper-to-nickel product.
05
Available Pressure-System Configurations
Different copper busbars do not require the same pressure structure. HAIFEI can evaluate several configurations according to the product and expected production conditions.
| Pressure system | More suitable for | Selection considerations |
|---|---|---|
| Pneumatic | Smaller bonding areas and lower force requirements | Simple structure, but requires a stable compressed-air supply |
| Pneumatic-hydraulic | Medium force in a relatively compact machine | Combines rapid air-driven movement with intensified welding pressure |
| Hydraulic | Larger bonding areas and higher force requirements | Suitable for heavier tooling and thicker copper stacks |
| Servo-electric | Projects requiring programmable movement and displacement control | Configuration depends on force, stroke and control requirements |
The pressure-system name does not determine welding quality by itself. Heating capacity, secondary-circuit design, tooling, cooling and process control must be matched to the same workpiece.
Why Should You Buy One?
Buy Haifei Copper Busbar Diffusion Bonding Equipment if you are in these industries or make these products:
Aerospace & Aviation: Manufacturing critical engine components, hollow turbine blades, lightweight structural panels with internal stiffeners, and parts for satellites and rockets.
Power Generation and Nuclear: Creating next-generation heat exchangers for gas turbines, nuclear reactors, and concentrated solar power systems.
Medical and Life Sciences: Producing incredibly clean, strong, and biocompatible implants (e.g., spinal cages, prosthetic joints) and sophisticated surgical instruments.
Semiconductor and Vacuum Technology: Making ultra-clean, high-integrity chambers, feedthroughs, and components that must hold a perfect vacuum without outgassing.
Automotive (High-Performance/Racing): Manufacturing advanced cooling systems, lightweight structural components for F1 and hypercars.
Research & Development: For universities and corporate R&D labs developing new materials and advanced component designs.
Certifications
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Haifei customers visit factory
Frequently Asked Questions
1.Is this a vacuum diffusion bonding machine?
No. This equipment uses local electrical heating, graphite tooling and axial pressure to consolidate copper foil busbars. It does not use a vacuum chamber or furnace heating.
2.Can one machine produce several copper busbar sizes?
Possibly. The machine must have enough current, pressure and working space for the largest product. Each bonded-end dimension normally requires corresponding graphite tooling and an approved welding recipe.
3.Can the equipment weld tinned copper foil?
Tinned copper foil can be evaluated, but the coating thickness and required surface result must be provided. The process settings may differ from those used for bare copper.
4.How many copper foil layers can be bonded?
There is no reliable universal layer limit. Layer quantity must be assessed together with individual foil thickness, total stack thickness and bonded area.
5.Can the bonded end be punched after welding?
Yes, when the compacted area has been designed and tested for the subsequent punching operation. Hole size, distance from the edge and required end thickness should be included in the drawing.
6.Does the machine require a water chiller?
It requires a stable circulating-water supply. An industrial chiller is normally needed when the customer does not have a suitable factory cooling system.
Request a Copper Busbar Diffusion Bonding Proposal
Send Haifei your busbar drawing, individual foil thickness, number of layers, total stack thickness, bonded dimensions and required production rate.
Our engineering team will review the heating capacity, pressure requirement, tooling design, loading space and cooling conditions before recommending a suitable copper busbar diffusion welding machine.
Where the product is close to the proposed machine's operating range, sample testing will be completed before the final configuration is confirmed.
Wuxi Haifei Intelligent Equipment Co., Limited is one of the leading manufacturers and suppliers of Copper Busbar Diffusion Bonding Equipment in China. With abundant experience, we warmly welcome you to buy advanced Copper Busbar Diffusion Bonding Equipment for sale here from our factory. Quality products and reasonable price are available.
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