Integrating Copper Terminal Blocks with Relays: A Pathway to BDU Miniaturization

Directly welding high-voltage relays to a copper terminal block shrinks Battery Disconnect Unit (BDU) volume by 53%, drops contact resistance by 62%, and eliminates wiring harnesses in electric vehicle power systems.

Key Miniaturization Benefits

• Volume Reduction: Combines switching and termination into one compact footprint.

• Thermal Management: Direct copper conduction dissipates heat faster under peak loads.

• Assembly Speed: Cuts module assembly steps from 14 down to 5.

Traditional BDU Design Limitations

Discrete relay layouts rely on flexible cables and separate busbars, creating clear physical bottlenecks:

• Excess Space: Separate enclosures require extra mounting brackets and fasteners.

• Thermal Hotspots: Multiple bolted interfaces increase contact resistance.

• Inductance Risks: Complex wiring routes introduce unwanted stray inductance.

Technical Architecture of Monolithic Integration

Integrating relay pins onto a continuous copper terminal strip replaces mechanical joints with direct welded contacts. C1100 copper provides high continuous ampacity while serving as a structural heat sink.

Using a multi-pole copper distribution block setup simplifies internal routing and protects against mechanical vibration in high-density battery enclosures.

Performance Metrics Comparison

Four-Step Implementation Protocol

1. Material Selection: Match C1100 copper specifications to required continuous ampacity.

2. Direct Welding: Laser-weld relay pins into the copper terminal block to eliminate bolted joints.

3. Dielectric Isolation: Mold ceramic isolators around conductive bus channels.

4. Validation Testing: Run thermal imaging and pulse current tests across all switching points.

Quick Implementation Checklist

1. Select C1100 copper specifications.

2. Laser-weld terminal connections.

3. Verify dielectric clearances under high voltage.