Flexible Busbar Manufacturer | Custom Copper & Aluminum Flexible Busbars

Carsai manufactures custom flexible busbar products for batteries, transformers, switchgear, busduct systems, power electronics and industrial electrical equipment.

Our flexible conductors can be manufactured from braided copper, stranded copper rope, laminated copper foil or flexible aluminum. Terminal shapes, conductor dimensions, hole patterns, surface finishes and insulation are produced according to customer drawings.

Available products include:

• Braided copper flexible connectors
• Stranded copper rope connectors
• Laminated copper foil busbars
• Insulated flexible copper busbars
• Flexible aluminum busbars
• Battery and BMS flexible links
• Transformer and busduct connectors
• Grounding and bonding jumpers
• Flexible copper shunts
• Custom terminal plates and mounting holes

We support prototypes, small production batches and repeat OEM orders.

Send your current requirement, drawing, conductor dimensions, terminal layout, material, finish and quantity for a project-specific quotation.

What Is a Flexible Busbar?

A flexible busbar is an electrical conductor designed to carry current while allowing a controlled degree of bending, movement or vibration absorption.

Unlike a solid rigid copper bar, a flexible conductor uses:

• Fine braided copper wires
• Multiple stranded copper ropes
• Stacked copper foils
• Thin laminated copper layers
• Flexible aluminum conductors

These structures reduce the mechanical force transferred between connected components.

The terms flexible bus bar, flexible bus bars, flexible busbars and flexible buss bars generally refer to the same broad product family.

Flexible busbars are commonly installed where two electrical terminals:

• Are not perfectly aligned
• Move during operation
• Experience vibration
• Expand and contract with temperature
• Require a compact high-current connection
• Cannot be connected conveniently with a rigid busbar

A custom flexible busbar can combine a flexible center conductor with solid terminal areas at both ends.

Main Types of Flexible Busbars

Flexible conductors should first be classified by their internal structure.

Braided Copper Flexible Connectors

Braided connectors are made from many fine copper wires woven into a flat or round conductor.

They provide high flexibility and are widely used for:

• Grounding and bonding
• Switchgear connections
• Transformer links
• Busduct joints
• Equipment jumpers
• Vibration-sensitive connections

Braided products can be supplied in bare copper or tinned copper.

The terminal ends may be:

• Press-welded directly
• Fitted with copper plates
• Fitted with fork terminals
• Drilled with one or more holes
• Plated after assembly

Stranded Flexible Copper Connectors

Stranded flexible connectors use multiple round copper ropes or stranded conductors arranged in parallel.

They are different from flat woven braid. Each conductor consists of many copper wires twisted into a strand or rope.

This construction is suitable when the assembly requires:

• Large movement
• High flexibility
• Long flexible sections
• Heavy-duty terminal plates
• Multiple parallel conductors
• Custom multi-hole terminals

Products can be manufactured from bare or tinned stranded copper.

The copper ropes may be pressed, welded or joined to solid terminal plates.

Laminated Copper Foil Busbars

A laminated flexible busbar is produced from multiple thin copper foils stacked together.

The middle section remains flexible, while the ends are usually pressed or welded into solid connection areas.

Laminated copper foil connectors are commonly used for:

• Transformers
• Switchgear
• Battery systems
• Inverters
• Rectifiers
• Busduct systems
• High-current equipment
• Welding and power systems

Compared with copper braid, laminated foil provides a broad, flat current path and controlled bending direction.

Custom options include:

• Number of copper layers
• Individual foil thickness
• Total cross-sectional area
• Flexible length
• Terminal width
• Hole pattern
• Bend geometry
• Tin or silver plating
• Partial insulation

Insulated Flexible Busbars

Insulated products normally use one of the conductor structures above and add an electrical covering over the flexible or central section.

Available insulation methods include:

• Heat-shrink tubing
• PVC sleeves
• Epoxy coating
• Powder coating
• Custom plastic protection
• Partial insulation with exposed terminals

Insulation can help protect conductors installed near:

• Metal enclosures
• Opposite-polarity terminals
• Other phases
• Battery modules
• Grounded structures
• Loose mounting hardware

Because insulation can affect heat dissipation, conductor sizing should be reviewed according to the actual operating environment.

Flexible Aluminum Busbars

Flexible aluminum conductors can be considered where lower weight or aluminum terminal compatibility is important.

Possible constructions include:

• Laminated aluminum strips
• Braided aluminum conductors
• Flexible aluminum links
• Formed aluminum connector bars

Aluminum conductors require careful terminal design because their conductivity, oxidation behavior and mechanical properties differ from copper.

Connections between aluminum and copper may also require an appropriate transition design.

Flexible Busbar Versus Rigid Busbar

A flexible busbar and a rigid busbar serve similar electrical functions but behave differently mechanically.

Rigid copper or aluminum busbars remain the best option when the conductor must hold a precise three-dimensional shape.

Flexible busbars are preferred at connection points where the rigid conductor system must interface with components that vibrate, move or expand.

Many assemblies use both:

1. Rigid busbars for main power distribution
2. Flexible connectors at transformers, breakers, batteries or equipment terminals

The flexible section prevents excessive force from being transferred to the connected component.

Flexible Busbar Materials

Copper

Copper is the most common material for flexible power conductors.

Typical options include:

• C11000 copper
• Cu-ETP copper
• T2 copper
• Oxygen-free copper
• Customer-specified electrical copper

Copper provides high electrical conductivity and is available in braid, strand and foil forms.

Tinned Copper

Tin plating can be applied to copper wires, completed terminal areas or the complete assembly.

Tinned copper is commonly selected for:

• Humid environments
• Battery systems
• Transformer connections
• Outdoor equipment
• International transportation and storage
• Connections to tinned terminals

Tin plating remains electrically conductive. It is a surface finish rather than an insulation material.

Aluminum

Aluminum offers lower weight than copper but requires a larger conductor cross-section for a comparable electrical requirement.

The final choice should consider:

• Current
• Available space
• Weight target
• Terminal material
• Environmental conditions
• Mechanical movement
• Equipment design

Terminal and End-Connection Options

The terminal design is one of the most important parts of a flexible busbar.

Available terminal forms include:

• Press-welded ends
• Solid copper terminal plates
• Single-hole terminals
• Two-hole terminals
• Multi-hole terminal plates
• Fork terminals
• Ring terminals
• Slotted holes
• Unequal terminal widths
• Custom-shaped connection palms

The drawing should define:

• Hole diameter
• Hole center distance
• Terminal width
• Terminal thickness
• Contact-surface length
• Plating areas
• Bend direction
• Flexible-section length

A conductor can have sufficient copper cross-section but still perform poorly if its terminals are too small, uneven or improperly installed.

Flexible Busbar Current Capacity

There is no universal current rating for every flexible busbar of the same width.

Current capacity depends on:

• Copper or aluminum cross-section
• Conductor construction
• Flexible-section length
• Continuous current
• Peak current
• Duty cycle
• Ambient temperature
• Enclosure temperature
• Airflow
• Terminal resistance
• Insulation coverage
• Allowable temperature rise

For a laminated copper busbar, the nominal cross-section can be estimated from:

Number of layers × foil width × foil thickness

For braided or stranded conductors, the effective metallic cross-section should be based on the total copper area rather than the conductor’s external dimensions.

A highly flexible braid contains spaces between individual wires, so its visible width and thickness do not directly equal a solid copper cross-section.

Current ratings such as 400A, 1000A, 2000A or 4000A should therefore be evaluated according to the complete installation.

Flexible Busbar Applications

Battery Packs and Energy Storage

Flexible battery busbars connect:

• Battery cells
• Battery modules
• Contactors
• Fuses
• BMS components
• Main positive and negative terminals
• Battery racks
• Power-distribution units

Flexibility can reduce stress caused by cell movement, assembly tolerance and vibration.

Transformers

Transformer flexible links connect winding terminals to busbars, switchgear or busduct systems.

They can help accommodate:

• Transformer vibration
• Thermal expansion
• Installation misalignment
• Terminal movement
• Assembly tolerances

Both laminated copper foil and braided copper constructions may be used.

Busduct and Busway Systems

Flexible connectors can bridge separate busduct sections or connect busways to transformers and switchboards.

They are frequently installed where rigid conductors cannot safely absorb equipment movement.

Switchgear and Control Equipment

Flexible conductors can connect:

• Circuit breakers
• Disconnect switches
• Contactors
• Capacitors
• Rectifiers
• Main busbars
• Distribution bars
• Power-electronic modules

They help reduce mechanical force on sensitive equipment terminals.

Grounding and Bonding

Braided copper straps are widely used for grounding and bonding because they can maintain electrical continuity across moving or vibrating components.

Applications include:

• Electrical enclosures
• Machine doors
• Cable trays
• Pipe flanges
• Busbar supports
• Transformer frames
• Equipment panels

Power Electronics

Compact flexible connectors are used inside:

• Inverters
• Converters
• UPS systems
• EV charging systems
• Industrial drives
• Renewable-energy equipment
• Energy-storage systems

A low-profile flexible conductor can reduce the amount of cable and terminal hardware required inside the equipment.

Custom Manufacturing Capabilities

Carsai manufactures flexible busbars according to customer drawings, samples and technical requirements.

Available processes include:

• Material cutting
• Copper-foil stacking
• Copper-wire braiding
• Copper-rope preparation
• Press welding
• Diffusion welding where specified
• Terminal-plate assembly
• Punching and drilling
• CNC machining
• Bending and forming
• Deburring
• Tin, nickel or silver plating
• Heat-shrink insulation
• PVC sleeving
• Epoxy coating
• Part-number marking
• Dimensional inspection
• Protective packaging

The product may be supplied straight or preformed to match the installed geometry.

About Busbar Extrusion

The term busbar extrusion normally refers to producing a continuous aluminum or copper profile with a defined cross-section.

Extruded profiles are generally rigid rather than flexible.

However, extrusion can be relevant to a complete busbar assembly when:

• An extruded aluminum terminal is combined with a flexible section
• A customized profile is used as a rigid connection end
• Flexible links connect separate extruded busbar sections
• The equipment contains both rigid extruded bars and flexible conductors

A flexible section itself is normally manufactured from braid, strand, foil or thin layered strip rather than produced as one solid extrusion.

Quality Inspection

Inspection requirements can be customized according to the drawing and purchase specification.

Typical checks include:

• Material verification
• Conductor width and thickness
• Flexible-section length
• Overall assembly length
• Terminal dimensions
• Hole diameter and spacing
• Bend position and angle
• Terminal flatness
• Plating coverage
• Insulation boundaries
• Surface condition
• Part-number marking

For repeat orders, approved drawings and reference samples help maintain consistency between batches.

Information Needed for a Quotation

Please provide:

• 2D or 3D drawing
• Flexible busbar type
• Copper or aluminum material
• Conductor width and thickness
• Copper cross-sectional area
• Overall length
• Flexible-section length
• Terminal dimensions
• Hole quantity and spacing
• Continuous and peak current
• Operating temperature
• Bare or plated finish
• Insulation requirement
• Prototype quantity
• Production quantity
• Estimated annual demand

When no formal drawing is available, you can provide a sample, sketch or installation photograph with key dimensions.

Related Flexible Busbar Solutions

Explore our flexible busbar products and technical guides for different conductor materials, structures, current levels and industrial applications. Each solution can be customized according to your drawing, terminal layout, current requirement, surface finish and insulation specifications.

• Flexible Copper Busbars – Multilayer, flat, braided and stranded copper conductors for compact high-current connections.
• Flexible Aluminum Busbars – Lightweight aluminum flexible bars, straps, links and custom terminal connectors.
• Flexible Battery Busbars – Flexible links for LiFePO4 cells, lithium-ion batteries, BMS, EV packs and forklift batteries.
• Transformer, Busduct and Busway Flexible Links – Laminated, braided and stranded connectors for transformer and busduct terminals.
• High-Current Flexible Busbars – Custom flexible conductors for applications from approximately 400A to 4000A and above.
• Flexible Busbar Connectors, Joints, Links and Jumpers – Custom copper connectors with holes, terminals, bends, plating and insulation.
• Insulated, Tinned and Heat-Shrink Flexible Busbars – Tinned copper conductors with heat-shrink, PVC, epoxy or partial insulation.
• Flexible Busbar Manufacturer, Supplier and Price Guide – Manufacturing capabilities, quotation factors, supplier selection and pricing information.
• Grounding and Bonding Jumpers – Flexible copper jumpers for equipment, cable trays, pipes, flanges and grounding systems.

Frequently Asked Questions

What is the difference between a braided and laminated flexible busbar?

A braided busbar uses woven copper wires and offers high multidirectional flexibility. A laminated busbar uses stacked copper foils and normally bends most easily in one defined direction.

What is a stranded flexible copper connector?

It uses several round copper ropes or stranded conductors connected in parallel between solid terminal ends.

Can flexible busbars be insulated?

Yes. Heat-shrink tubing, PVC sleeves, epoxy coating and other insulation methods can be applied while leaving terminal contact areas exposed.

Can you manufacture both copper and aluminum flexible busbars?

Yes. Material selection depends on current, weight, terminal compatibility and the customer’s design.

Can you provide a standard amp rating?

The rating depends on conductor cross-section, length, temperature, cooling, insulation and terminal design. Please provide the actual operating conditions.

Can you manufacture from an existing sample?

Yes. Samples can support initial evaluation, but an approved dimensioned drawing is recommended for repeat production.

Are custom holes and terminal plates available?

Yes. Single-hole, two-hole, multi-hole, slotted, fork and custom terminal arrangements can be manufactured.

Request a Custom Flexible Busbar Quotation

Carsai manufactures custom flexible copper and aluminum busbars for batteries, transformers, busduct systems, switchgear and industrial power equipment.

Send your drawing, conductor material, dimensions, current, terminal design, insulation, surface finish and required quantity.

Request a quotation for a custom flexible busbar manufactured to your drawing or sample.