Dismantling of High-Voltage Busbar for New Energy

Disassembling high-voltage busbars requires careful attention to electrical isolation, material handling, and mechanical connections to ensure safety and preserve system integrity.

Key Considerations Before Disassembly

Safety First: High-voltage busbars in EVs, HEVs, or energy storage systems can carry voltages from 400V to 1800V. Always disconnect the system from all power sources, discharge capacitors, and verify zero voltage using insulated measurement tools before touching any busbar components . Personal protective equipment (PPE) such as insulated gloves, face shields, and dielectric footwear is mandatory. Material Awareness: Busbars are typically made of copper or aluminum. Copper offers superior thermal conductivity (401 W/mK) and is easier to solder or weld, while aluminum is lighter (~50% of copper weight) and less costly but requires ultrasonic or laser welding due to its oxide layer . Understanding the material is crucial for handling and avoiding damage during disassembly. Busbar Type: Modern systems may use multi-layer molded busbars with integrated insulation and over-molded plastics (e.g., PPS, PPA, PBT) or laminated busbars for inverters . These designs require careful separation of layers and attention to embedded insulation films (PET, Mylar, Mica) to prevent short circuits or mechanical damage.

Disassembly Procedure

1. System Shutdown and Verification: Ensure the system is fully powered down, capacitors are discharged, and voltage is verified at all busbar terminals.
2. Documentation and Labeling: Before removal, label all connections and take photographs or diagrams of the busbar layout. This is critical for reassembly or troubleshooting.
3. Mechanical Fasteners: Loosen bolts, screws, or clamps securing the busbar. For laminated or molded busbars, check for embedded fasteners or clips that may require specialized tools.
4. Thermal and Electrical Isolation: Carefully separate busbars from heat sinks, DC-link capacitors, or power modules. Avoid bending or stressing the busbar, as sharp corners or edges can increase impedance and cause future electrical issues .
5. Layered or Molded Busbars: For multi-layer designs, gently separate layers while maintaining insulation integrity. Avoid damaging over-molded plastics or embedded films, as these provide both electrical insulation and mechanical support .
6. Handling and Storage: Store removed busbars in a non-conductive, dry environment. Aluminum busbars are softer and prone to deformation, while copper busbars are heavier and require secure support to prevent bending.

Additional Tips

• Thermal Considerations: Busbars may retain heat after operation. Allow sufficient cooling time before handling.
• Inspection: Check for corrosion, cracks, or oxidation, especially on aluminum busbars, before reinstallation.
• Tools: Use insulated wrenches, torque-controlled drivers, and non-conductive supports to prevent accidental short circuits.

Summary

Disassembly of high-voltage busbars in new energy systems is a high-risk task that requires strict adherence to safety protocols, knowledge of material properties, and careful handling of mechanical and electrical connections. Proper labeling, documentation, and attention to insulation and thermal management are essential to maintain system integrity and ensure safe reassembly .