Flexible Aluminum Busbar & Aluminum Flexible Links

Carsai manufactures custom aluminium flexible busbar products for batteries, transformers, switchgear, power distribution and industrial electrical equipment.

Flexible aluminum conductors can reduce weight while accommodating vibration, thermal expansion and minor terminal misalignment. Products are manufactured according to customer drawings rather than supplied only as standard aluminum strips.

Available options include:

• Multilayer aluminum flexible busbars
• Flexible aluminum flat bars
• Aluminum straps and jumper links
• Preformed flexible connectors
• Custom terminal areas and mounting holes
• Bare or plated contact surfaces
• Partially insulated aluminum busbars
• Prototype and production quantities

Send your drawing, aluminum grade, dimensions, current requirement, terminal design, finish and quantity for a project-specific quotation.

For other conductor structures and materials, visit our Flexible Busbar Manufacturer page.

What Is a Flexible Aluminum Busbar?

A flexible aluminum busbar is an electrical conductor designed to carry current while providing more movement than a conventional solid aluminum bar.

Search phrases such as flexible aluminum busbar, aluminium flexible busbar, flexible busbar aluminium and aluminum flexible bus bar generally refer to the same product family.

Depending on the application, flexibility may be created through:

• Several thin aluminum layers
• A long, thin aluminum conductor section
• Flexible aluminum braid
• A formed aluminum strap
• A rigid terminal combined with a flexible center section

Flexible construction can help accommodate:

• Equipment vibration
• Thermal expansion
• Installation tolerance
• Small differences in terminal height
• Movement between connected assemblies
• Mechanical stress at component terminals

The exact construction must be selected according to current, movement, available space and connection requirements.

Aluminium Flexible Bar Construction

An aluminium flexible bar may use multiple thin aluminum layers instead of one thick solid conductor.

The layers can move slightly relative to one another, allowing the assembly to bend more easily.

A typical multilayer product may include:

1. Several thin aluminum strips
2. A flexible center section
3. Compressed or joined terminal areas
4. Drilled mounting holes
5. Optional plating or transition terminals
6. Optional insulation over the central section

The total nominal aluminum cross-section can be estimated from:

Number of layers × layer width × layer thickness

However, current capacity cannot be determined from cross-section alone. The design must also consider length, cooling, ambient temperature, insulation and terminal resistance.

Flexible Aluminum Flat Bar

A flexible aluminum flat bar provides a low-profile connection between nearby electrical components.

Compared with round cable assemblies, a flat conductor may offer:

• Reduced installation height
• Broad terminal contact areas
• Controlled mounting-hole positions
• Fewer separate cable lugs
• Easier connection to rigid busbars
• Custom bends and offsets
• Lower conductor weight than copper

The term can also describe a relatively thin solid aluminum strip with limited bending capability. Therefore, the drawing should specify whether the product must be repeatedly flexible or only formed during installation.

A thin solid strip is not equivalent to a multilayer flexible busbar.

Flexible Aluminum Links and Jumpers

An aluminium flexible link connects two terminals while allowing limited movement between them.

Common applications include connections between:

• Batteries and distribution bars
• Transformers and switchgear
• Busbars and circuit breakers
• Contactors and fuses
• Inverters and power modules
• Separate busbar sections
• Equipment frames and conductive assemblies

An aluminium flexible jumper normally describes a shorter link bridging two nearby connection points.

Jumper configurations may include:

• Straight links
• L-shaped connectors
• Z-shaped offsets
• U-shaped conductors
• Different terminal widths
• Single- or multi-hole ends
• Slotted mounting holes
• Preformed three-dimensional shapes

The installed direction should be clearly shown on the drawing because aluminum connectors should not be forced into position after production.

Flexible Aluminum Straps

A flexible aluminum strap may be manufactured from layered aluminum, thin formed strip or another customer-specified flexible construction.

Straps are suitable where the connection requires:

• A broad, flat conductor
• Low component weight
• Short connection distance
• Customized hole patterns
• Limited vibration absorption
• Compatibility with aluminum terminals

For connections involving repeated movement or high vibration, the fatigue performance of the selected structure should be reviewed carefully.

Aluminum generally requires more cross-sectional area than copper for the same electrical objective, so conductor dimensions must be selected according to actual operating conditions.

Aluminum Versus Copper Flexible Busbars

Aluminum may be preferred when weight and material compatibility are important.

Copper may be more suitable where:

• Installation space is limited
• Very high conductivity is required
• Terminal size must remain compact
• Existing connections are copper
• A highly flexible braid or copper-rope structure is needed

The final choice should be based on the complete electrical and mechanical design rather than raw-material price alone.

Copper-to-Aluminum Connections

When a flexible aluminum conductor connects to copper equipment, the joint must address material compatibility.

Possible solutions depend on the customer’s design and may include:

• Bimetal transition terminals
• Aluminum terminals with specified surface treatment
• Mechanical transition plates
• Compatible joint compounds
• Customer-defined plated contact areas

The mating material and terminal arrangement should be stated before quotation.

Directly assembling dissimilar metals without an appropriate connection design can increase the risk of oxidation and unstable contact resistance.

Insulated Aluminium Busbar Options

An insulated aluminium busbar contains a protective covering over selected conductor areas while leaving the terminal surfaces exposed.

Possible insulation options include:

• Heat-shrink tubing
• PVC sleeves
• Epoxy coating
• Powder coating
• Custom protective covers
• Partial insulation around the flexible section

Insulation may be required when the busbar is installed close to:

• Opposite-polarity conductors
• Other phases
• Battery modules
• Grounded enclosures
• Metal supports
• Equipment frames

Because insulation reduces direct exposure to cooling air, its effect on conductor temperature should be considered during current-rating evaluation.

The drawing should identify:

• Insulated areas
• Exposed terminal length
• Required insulation material
• Thickness
• Color
• Operating temperature
• Electrical requirements

Materials and Surface Treatment

The aluminum grade should be specified according to conductivity, forming and mechanical requirements.

Possible materials include customer-specified electrical aluminum grades and aluminum alloys suitable for the required forming process.

Surface options may include:

• Bare aluminum
• Tin-plated terminal areas
• Nickel-plated areas where specified
• Silver-plated contact areas
• Anodized non-contact sections
• Insulated conductor sections

Not every finish is suitable for every grade or terminal design. The plating requirement and covered areas should be marked on the drawing.

Current Capacity and Thermal Design

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

Important factors include:

• Aluminum grade
• Total metallic cross-section
• Number and thickness of layers
• Conductor length
• Flexible-section length
• Continuous current
• Peak current
• Duty cycle
• Ambient temperature
• Enclosure temperature
• Airflow
• Insulation coverage
• Terminal contact resistance
• Allowable temperature rise

A short bare link in open air may operate differently from a long insulated connector inside a closed battery cabinet.

Provide actual operating conditions rather than selecting the busbar only from a generic amp table.

Custom Terminal and Hole Options

Flexible aluminum links can be manufactured with:

• Single-hole terminals
• Two-hole patterns
• Multi-hole terminal plates
• Round holes
• Slotted holes
• Different terminal widths
• Wider mounting palms
• Offset terminal planes
• Preformed bends
• Customer-defined outlines

Important drawing dimensions include:

• Hole diameter
• Center-to-center spacing
• Edge distance
• Terminal width and thickness
• Contact-surface dimensions
• Bend location
• Overall length
• Flexible-section length

Adequate terminal contact area is essential for stable electrical performance.

Information Needed for a Quotation

Please provide:

• 2D or 3D drawing
• Aluminum grade
• Flexible conductor structure
• Width and total thickness
• Individual layer thickness
• Overall and flexible-section length
• Hole size and spacing
• Terminal design
• Continuous and peak current
• Operating temperature
• Mating-terminal material
• Surface finish
• Insulation requirement
• Prototype and production quantities

Frequently Asked Questions

Is an aluminum flexible busbar lighter than a copper one?

Yes. Aluminum has lower density, but it normally requires a larger cross-sectional area for the same electrical requirement.

Can flexible aluminum busbars be insulated?

Yes. Heat-shrink, PVC, epoxy and other insulation options can be applied according to the drawing.

Can you manufacture custom holes and bends?

Yes. Terminal shapes, hole patterns, offsets and bends can be produced according to customer specifications.

Can an aluminum busbar connect to a copper terminal?

Yes, but the connection should use an appropriate transition and surface-treatment design.

Are aluminum flexible links available in multilayer construction?

Yes. Several thin aluminum layers can be assembled to provide greater flexibility than one solid bar.

Request a Flexible Aluminum Busbar Quotation

Carsai manufactures custom flexible aluminum flat bars, straps, links and jumpers for batteries, transformers, switchgear and industrial power systems.

Send your drawing, aluminum grade, dimensions, current, terminal arrangement, surface finish, insulation and required quantity.

Request a custom flexible aluminum busbar quotation based on your drawing or sample.