Flexible Battery Busbar for LiFePO4, BMS & EV Battery Packs -

Carsai manufactures custom flexible battery busbar products for lithium-ion batteries, LiFePO4 packs, battery management systems, electric vehicles, forklifts and energy-storage equipment.

Flexible battery connectors carry current between cells, modules, fuses, contactors and main terminals while accommodating vibration, thermal expansion and small assembly tolerances.

Our products include:

Laminated copper foil battery links
Braided copper battery connectors
Stranded copper flexible links
Insulated flexible battery busbars
Battery cell interconnectors
Fuse and contactor connection bars
EV battery module connectors
Forklift battery links
Custom terminals, holes and bends
Bare, tinned and insulated copper conductors

Send your cell or module layout, current, dimensions, terminal pattern, surface finish and quantity for a project-specific quotation.

For an overview of available conductor structures, visit our Flexible Busbar Manufacturer page.

Custom tin-plated copper busbar links with orange insulation and mounting holes

What Is a Flexible Battery Busbar?

A flexible busbar for battery systems is a conductive link designed to connect battery components while transferring less mechanical force than a solid rigid bar.

Search terms including flexible busbar battery, flexible battery bus bar, battery flexible busbar and flexible busbar for battery generally describe the same product family.

Typical connection points include:

Battery cell terminals
Adjacent battery modules
Main positive and negative terminals
Contactors
Fuses
Current sensors
Battery disconnect units
Power-distribution units
Inverters and chargers

Flexibility can help compensate for:

Cell dimensional variation
Module assembly tolerances
Vehicle vibration
Thermal expansion
Terminal-height differences
Movement during battery operation

A flexible connector should still be supported correctly. It is not intended to compensate for major dimensional errors or uncontrolled mechanical movement.

Flexible Battery Busbar Structures

Laminated copper foil links

A laminated battery flexible link uses multiple thin copper foils stacked together.

The terminal areas are normally compressed, press-welded or otherwise joined into solid mounting sections, while the center remains flexible.

Braided copper battery connectors

Braided links are manufactured from many fine copper wires woven into a flexible conductor.

They are suitable where the connector must accommodate vibration or movement in several directions.

Braided battery links may have:

Press-welded ends
Copper terminal plates
One-hole or two-hole terminals
Tinned copper braid
Heat-shrink insulation
Custom overall length

Stranded copper links

Stranded connectors use several copper ropes or flexible conductors arranged in parallel between terminal plates.

They are suitable for longer connections requiring significant flexibility.

Insulated flexible battery busbars

Battery links can be supplied with:

Heat-shrink tubing
PVC sleeves
Epoxy coating
Custom plastic protection
Polarity-colored insulation

The terminal contact areas normally remain exposed.

LiFePO4 Battery Flexible Busbars

A LiFePO4 battery flexible busbar connects prismatic cells, modules or electrical protection components in lithium iron phosphate battery systems.

Equivalent search variations include:

Flexible busbar LiFePO4
LiFePO4 flexible busbar
Flexible copper link for LiFePO4 cells
LiFePO4 battery connector bar

These products are used in:

Residential energy storage
Commercial battery cabinets
Solar battery systems
Telecom backup power
Marine battery packs
Industrial energy storage
Mobile power systems
UPS batteries

Cell capacity alone does not determine the required busbar size.

A 200Ah or 280Ah cell can be used at different continuous and peak currents depending on the battery-pack design.

Therefore, searches such as flexible battery links 200Ah LiPo or flexible battery links 280Ah LiPo should be reviewed using:

Continuous current
Peak current
Current duration
Cell-terminal dimensions
Number of parallel cells
Ambient temperature
Allowable temperature rise

Although “LiPo” is sometimes used broadly in search phrases, the exact battery chemistry and cell model should be confirmed.

Lithium-Ion Battery Cell Connectors

A lithium battery cell copper connector creates the conductive path between individual cells or cell groups.

Similarly, lithium ion batteries busbar connectors may refer to:

Cell-to-cell links
Module-to-module links
Cell-terminal plates
Flexible intermodule connectors
Fuse-to-contactor links
Main pack output busbars

The connector design should match the actual cell terminal.

Important dimensions include:

Terminal-hole diameter
Center-to-center spacing
Cell pitch
Busbar width and thickness
Distance between modules
Required flexible length
Terminal contact area
Insulation clearance

For series-connected cells, consistent hole spacing is especially important because small dimensional errors can accumulate across the battery module.

Flexible Copper Busbar for BMS Connections

The phrase flexible copper busbar BMS can describe two different requirements.

High-current battery connections

These are power conductors connected to:

Contactors
Fuses
Current sensors
Main positive and negative terminals
Battery disconnect units

Low-current BMS sensing connections

These are smaller conductors or tabs used for voltage and temperature monitoring.

A high-current battery busbar should not be confused with a small BMS sensing lead.

The inquiry should clarify whether the part carries:

Main battery current
Module current
Balance current
Voltage-sensing current
A temperature-sensor signal

Carsai mainly manufactures custom metal power connectors and busbar components according to drawings.

EV Battery Flexible Busbar Connectors

An EV battery flexible busbar connector can be used between:

Battery modules
Contactors
Main fuses
Current sensors
Disconnect units
Inverters
Charging interfaces
High-voltage junction boxes

EV applications may require the connector to accommodate:

Road vibration
Module expansion
Compact installation
High continuous current
Short peak-current events
High-voltage insulation
Automated assembly tolerances

Possible constructions include laminated copper foil, braided copper and insulated flexible links.

The customer should specify the required voltage, insulation, creepage distance and testing requirements rather than relying only on a generic “EV busbar” description.

Forklift Battery Intercell Connectors

A forklift battery intercell connector joins adjacent battery cells or groups within a traction battery system.

Related terms include:

Forklift battery link
Forklift battery connector bar
Flexible forklift battery link
50 mm² forklift battery connector bar

A 50 mm² specification normally describes the nominal metallic cross-sectional area. It does not by itself guarantee a particular amp rating.

Forklift battery links may require:

High flexibility
Resistance to vibration
Tinned copper surfaces
Corrosion-resistant terminals
Custom cell spacing
One-hole or two-hole ends
Replaceable connector geometry

An existing sample can support initial dimensional review, but a drawing is recommended for repeat production.

Flexible Battery Links and Current Rating

Search phrases such as flexible battery links 200amp indicate a target current, but the final conductor cannot be selected from current alone.

Important factors include:

Total copper cross-section
Connector length
Flexible-section length
Continuous current
Peak current
Duty cycle
Ambient temperature
Battery enclosure temperature
Cooling conditions
Terminal resistance
Insulation coverage
Allowable temperature rise

The visible width and thickness of a braided conductor do not equal the cross-section of solid copper because spaces exist between the wires.

For laminated foil conductors, nominal cross-section can be calculated from:

Number of layers × foil width × foil thickness

Electrical and thermal performance should be validated under actual battery operating conditions.

Battery Connector Bar Design

A battery connector bar or copper battery link can be manufactured as a straight, bent or flexible component.

Available features include:

Single mounting holes
Two-hole terminal patterns
Multiple cell-terminal holes
Slotted holes
Wider terminal pads
Narrow flexible center sections
Offset terminal planes
L-shaped and Z-shaped forms
Full or selective tin plating
Partial insulation
Polarity marking

For phrases such as flexible battery links sets PF 16, the complete product reference, cell model or drawing should be supplied because “PF 16” may be a customer-specific set, model or internal part designation.

Copper Materials and Finishes

Common material options include:

C11000 copper
Cu-ETP copper
T2 copper
Oxygen-free copper when specified
Customer-defined electrical copper

Surface options include:

Bare copper

Suitable for protected applications where the specification permits an untreated copper surface.

Tin-plated copper

Frequently used for battery connectors because it helps protect the surface from oxidation and provides a consistent terminal finish.

Nickel- or silver-plated terminals

Available for specialized requirements when defined by the drawing.

Plating does not replace correct terminal preparation, bolt torque or contact-area design.

Custom Manufacturing

Carsai can manufacture flexible battery links through:

Copper-foil cutting and stacking
Copper-wire braiding
Copper-rope preparation
Press welding
Terminal-plate assembly
Punching and drilling
CNC machining
Bending and forming
Deburring
Tin plating
Heat-shrink insulation
PVC sleeving
Epoxy coating
Dimensional inspection
Protective packaging

Products can be supplied straight or preformed to match the installed battery layout.

Information Needed for a Quotation

Please provide:

Battery chemistry and cell model
Cell or module layout
2D or 3D drawing
Conductor structure
Copper grade
Width and thickness
Copper cross-sectional area
Overall length
Flexible-section length
Hole diameter and spacing
Continuous and peak current
Operating voltage
Surface finish
Insulation requirement
Prototype and production quantities

Frequently Asked Questions

Are flexible busbars suitable for LiFePO4 cells?

Yes. The connector must be designed according to the cell spacing, current, terminal dimensions and battery layout.

Is a 200Ah battery busbar rated for 200 amps?

Not necessarily. Amp-hour capacity describes the battery, while busbar current capacity depends on the electrical and thermal design.

Can you manufacture connectors for 280Ah prismatic cells?

Yes. Send the cell model, terminal spacing, current and required quantity.

Can flexible battery links be tin plated and insulated?

Yes. Copper links can be tin plated and partially insulated while leaving the terminal surfaces exposed.

Can you make EV and forklift battery connectors?

Yes. Products can be manufactured from drawings or samples for EV modules, forklift traction batteries and industrial battery systems.

Can the two terminal ends have different hole patterns?

Yes. Each end can have a different width, hole size, spacing and orientation.

Request a Flexible Battery Busbar Quotation

Carsai manufactures flexible copper battery links, laminated foil connectors, braided links and custom battery connector bars for LiFePO4, lithium-ion, EV and forklift battery systems.

Send your cell or module layout, drawing, current, dimensions, material, finish, insulation and quantity.

Request a custom flexible battery busbar quotation based on your battery design.

Get a Quote