A copper foil diffusion welding machine is used to bond one or both ends of stacked copper foils. The bonded terminal forms a compact conductive connection, while the unbonded middle section remains flexible.
The process is suitable for flexible busbars that must carry high current while absorbing vibration, thermal expansion or assembly movement. Typical parts are used in battery packs, energy storage systems, switchgear, transformers, inverters and other power equipment.
HAIFEI supplies copper foil bonding machines for sample production, batch manufacturing and automated production lines. Each machine is selected around the foil stack, bonding dimensions, required cycle time and inspection standard.
How Copper Foil Diffusion Welding Works
The process combines controlled electrical heating with pressure. No solder, brazing alloy or additional filler metal is required.
- Copper foils are cut, cleaned and stacked according to the product drawing.
- The foil stack is positioned inside the graphite tooling.
- The pressure system clamps the bonding area and holds the foil layers in position.
- Current passes through the working area to generate heat.
- Current, pressure and holding time are controlled according to the material and stack dimensions.
- After the set cycle is completed, the bonded terminal is cooled and removed for inspection.
The correct setting is not determined by machine capacity alone. Copper grade, surface condition, foil thickness, number of layers, bonding area and pressure distribution all affect the result.
Parts This Machine Can Produce
Copper Foil Flexible Busbars
Multiple layers of thin copper foil are bonded at the terminal while the center section remains flexible. These parts are commonly installed where a rigid copper bar cannot accommodate movement or vibration.
Laminated Copper Connectors
The machine can form compact terminal sections on stacked copper conductors for connecting batteries, power modules, busbars and electrical terminals.
Battery and Energy Storage Connections
Copper foil connectors can be used between battery modules, battery pack terminals, contactors and power distribution components. The machine and fixture are developed according to the connector drawing.
Electrical Equipment Flexible Links
Applications include switchgear, circuit breakers, transformers, rectifiers, inverters and other high-current equipment requiring a flexible conductive connection.
Machine Features
Controlled Heating and Pressure
The welding controller manages the heating cycle, while the pressure system keeps the foil layers in close contact. Parameters are adjusted according to the bonding area and total stack thickness.
Custom Graphite Tooling
The graphite tooling is designed around the terminal shape and bonding dimensions. Correct tooling helps maintain foil alignment, heat distribution and the required finished profile.
PLC and HMI Control
The operator can set and view the working cycle through the control interface. Parameter storage is available for products that require different process settings.
Flexible Automation Options
Manual loading, semi-automatic operation and automated loading solutions are available. The automation level is selected according to part size, production volume and factory layout.
Water-Cooled Working Components
The cooling circuit controls heat accumulation during repeated operation. The required chiller or cooling arrangement is selected according to machine capacity and production cycle.
Optional Process Monitoring
Selected process data can be monitored or recorded according to the project. The actual monitoring items depend on the control configuration and the customer's traceability requirements.
Copper Foil Diffusion Welding vs. Other Joining Methods
| Method | Filler Material | Typical Consideration |
| Diffusion welding | Not required | Process depends on controlled heat, pressure and surface condition |
| Soldering | Solder required | Additional material remains at the joint |
| Brazing | Brazing alloy required | Requires suitable filler and heating control |
| Bolted connection | Fasteners required | Adds parts and requires mechanical assembly |
| Ultrasonic welding | Not normally required | Suitability depends on foil stack, area and equipment capability |
No single joining method is suitable for every copper connector. The correct process should be selected according to part dimensions, conductivity requirement, mechanical load, production volume and inspection standard.
Typical Applications
Electric Vehicle Battery Packs
Flexible copper busbars can connect battery modules, contactors and power distribution units while allowing movement between assembled components.
01
Energy Storage Systems
Laminated copper connectors are used for current transmission between battery modules, racks and power conversion equipment.
02
Switchgear and Circuit Breakers
Flexible conductive links can connect moving or fixed current-carrying components where a rigid busbar is unsuitable.
03
Transformers and Rectifiers
Copper foil flexible connectors can compensate for vibration and installation movement between high-current terminals.
04
Inverters and Power Electronics
The bonded copper terminal provides a compact connection point, while the flexible section helps accommodate assembly position and thermal movement.
05
Product uniqueness
Hydraulic Cylinder
Microcomputer Control
Temperature Detector
Antioxidant Graphite
Technical Specifications (Copper Foil Bonding Machine)
| Parameter | Specification |
| Model | HFTD-350 |
| Bonding Pressure | Hydraulic System, Up to 350 Tons (Adjustable) |
| Platen Size | Customizable (Standard: e.g., 400mm x 400mm) |
| Heating Method | Electric Resistance Heating (Platen) |
| Max. Temperature | Up to 800°C (Precisely Controllable) |
| Control System | Programmable Logic Controller (PLC) with Digital PID Temperature & Pressure Control |
| Cooling | Integrated Water Cooling System (Optional) |
| Power Supply | 3-Phase, 380V / 50Hz (or as required) |
| Footprint | Approx. L x W x H: [To be specified based on actual size] |
Information Needed for Machine Selection
To recommend a suitable Copper Foil Diffusion Welding Machine, please provide:
1
Copper foil thickness
2
Number of foil layers
3
Total stack height
4
Bonding area size
5
Required production capacity
6
Resistance or strength requirement
7
Drawing or sample photos
8
Manual, semi-automatic, or automatic production requiremen
FAQ
01.Can copper foil be bonded without solder?
02.How many copper foil layers can the machine bond?
03.Is this machine suitable for flexible busbar production?
04.Can the machine process tinned copper foil?
05.How is the bonded copper terminal inspected?
06.What is the difference between a copper foil bonding machine and a copper diffusion welding machine?
Wuxi Haifei Intelligent Equipment Co., Limited is one of the leading manufacturers and suppliers of Copper Foil Diffusion Welding Machine in China. With abundant experience, we warmly welcome you to buy advanced Copper Foil Diffusion Welding Machine for sale here from our factory. Quality products and reasonable price are available.
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