Copper Flexible Connectors: Laminated vs Braided - Which to Choose?

Copper flexible connectors come in two primary types: laminated foil and braided. Each has unique characteristics that make it suitable for different applications. This guide compares both types to help you make the right choice.

Construction Differences

Laminated Flexible Connectors (LCDQ Series)

Laminated connectors are made from multiple layers of thin copper foil stacked together:

• Foil thickness: Typically 0.05mm to 0.3mm per layer
• Construction: Flat, rectangular cross-section
• Termination: Usually welded or bolted end blocks
• Flexibility: Good, primarily in one plane (along the thin dimension)

Braided Flexible Connectors (LCJQ Series)

Braided connectors are made from many fine copper wires woven together:

• Wire diameter: Typically 0.05mm to 0.20mm per wire
• Construction: Round or flat braided strap
• Termination: Usually crimped or clamped terminals
• Flexibility: Excellent, flexible in all directions

Performance Comparison

Current Carrying Capacity

Factor	Laminated	Braided
Current density	Higher (more compact)	Lower (less dense packing)
Same cross-section	~10-15% higher current	Standard
Heat dissipation	Good (flat profile)	Good (more surface area)

Flexibility & Movement

Laminated connectors:

• Bend easily along the thin dimension
• Less flexible along the wide dimension
• Good for thermal expansion compensation
• Suitable for limited movement applications

Braided connectors:

• Highly flexible in all directions
• Can be twisted and routed around obstacles
• Excellent vibration absorption
• Better for dynamic applications

Mechanical Strength

• Laminated: Higher tensile strength, more rigid structure
• Braided: More compliant, better shock and vibration absorption

Size & Space Requirements

• Laminated: More compact cross-section for same current rating
• Braided: Larger overall diameter/width due to braid structure

Application Suitability

Best for Laminated Connectors

1. Transformer connections - Thermal expansion compensation
2. Busbar expansion joints - Controlled linear movement
3. Switchgear and circuit breakers - Compact, high-current connections
4. Power converters - High current density in limited space
5. Battery modules - Stacked cell connections

Best for Braided Connectors

1. Grounding and bonding - Most common and cost-effective
2. Battery terminals - Easy installation, good flexibility
3. Panel jumpers - Routing around obstacles
4. Vibrating equipment - Motors, generators, welding machines
5. Lightning protection - High flexibility for down conductors

Cost Considerations

Laminated Connectors

• Generally higher cost per ampere
• More complex manufacturing process
• Welded terminations add cost
• Better value in high-current, space-constrained applications

Braided Connectors

• Generally lower cost, especially for smaller sizes
• Simpler manufacturing
• Crimped terminations are economical
• Best value for grounding and general-purpose use

Making Your Choice

Choose Laminated When:

• You need maximum current in minimum space
• Movement is primarily in one plane
• The application is high-current (500A+)
• You need precise dimensional control
• The environment is enclosed or compact

Choose Braided When:

• You need maximum flexibility
• The application involves vibration
• Routing through complex paths is required
• Cost is a primary concern
• You need grounding or bonding connections

Can’t Decide?

Many applications can use either type effectively. Consider these factors:

1. Current rating: Above 500A, laminated is often more compact
2. Flexibility needs: High flexibility requirements favor braided
3. Space constraints: Tight spaces favor laminated
4. Budget: Smaller sizes are more economical in braided
5. Vibration level: High vibration favors braided

At CuMetal, we offer both types and can help you select the optimal connector for your application. Our engineering team can review your requirements and recommend the best solution. Contact us for a consultation.

Summary

Both laminated and braided copper flexible connectors have their place. Laminated connectors excel in high-current, space-constrained applications with controlled movement, while braided connectors offer superior flexibility and value for grounding, bonding, and dynamic applications.