Detailed explanation of industry knowledge on insulation busbar copper bar impregnation processing technology

In the architecture of power electrical systems and new energy equipment, copper busbars are the core basic conductive components responsible for power transmission and circuit connections. The quality of its surface protection technology directly determines the insulation safety, environmental adaptability and long-term operation stability of electrical equipment. Compared with conventional surface treatment methods such as traditional spray painting and electroplating, dipping processing is currently the mainstream and high-performance protective treatment process for insulated busbars. With multiple advantages such as strong coating adhesion, stable insulation performance, environmental protection and no residue, and excellent weather resistance, it is widely used in core scenarios such as high and low voltage distribution cabinets, transformers, energy storage equipment, rail transit, and power battery modules. Copper busbars processed through a professional dipping process can build a complete and airtight protective insulation layer while retaining the excellent conductive properties of the copper substrate, effectively avoiding potential safety hazards such as electrical short circuits, arc breakdown, and dielectric corrosion. PVC Dipping Insulated Busbar has also become a core insulating conductive component for power and electrical equipment by virtue of its mature process characteristics.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The insulated busbar is the core component used to connect high-voltage electrical appliances in the power system. Its function is to ensure the conduction of large currents while providing reliable electrical isolation and mechanical protection. In order to strike a balance between conductive performance and insulation safety, copper strip dipping processing technology is widely used. The basic principle of this technology is to immerse the metal part of the copper bus in a high-temperature molten thermoplastic (such as PVC, nylon or polyethylene), so that the plastic evenly wraps the surface of the copper bus, and then solidifies by cooling to form a dense, tough and anti-aging insulation layer. This insulation layer not only significantly improves the voltage resistance of the busbar, but also effectively resists chemical corrosion such as moisture, salt spray, acid and alkali, thereby extending the service life of the busbar in harsh environments. In engineering applications, PVC Dipping Insulated Busbar (PVC Dipping Insulated Busbar) is the most representative product form. Its insulation layer is formed by one-time dip molding, with no seams and no air gaps. Compared with traditional heat-shrink sleeves or insulation tape wrapping, it has higher reliability and consistency. In addition, Insulated Custom Copper Bus Bar with PVC Dipping (customized PVC dipping insulated copper busbar) can be designed non-standardly based on the three-dimensional model provided by the customer - for example, leaving exposed areas in the parts that need to be bent, drilled or soldered terminals, while other parts are completely covered by the dipping layer, achieving precise control of "conduction where conductive parts are needed and isolation where insulation is needed".

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The technological process of copper bar dipping processing generally includes: copper bar surface pretreatment (degreasing, pickling, passivation), preheating, dipping, leveling and solidification, cooling and inspection. Among them, surface pretreatment is the primary link that determines the adhesion of the coating - if the oil, oxide layer or impurities on the surface of the copper strip are not completely removed, it will cause blistering or peeling of the insulation layer during subsequent use. The matching of preheating temperature and immersion time is the core of the process: if the temperature is too low, the powder cannot be fully melted, and orange peel or pinhole defects will appear in the coating; if the temperature is too high, the fluidity of the coating will be too strong, resulting in edge sagging or uneven thickness. Typical dipping process parameters are: preheating temperature 180-220°C, dipping time 3-8 seconds, curing temperature 160-200°C, curing time 10-20 minutes, and finally forming an insulation layer with a thickness of 0.1- 0.5 mm. For applications requiring higher voltage withstand capabilities, a double dip process can be used to bring the total thickness to 0.8- 1.0 mm.

 

In terms of quality inspection, PVC Dipped Insulated Bus Bar must undergo 100% visual inspection (no bubbles, sagging, impurities), coating thickness test (multi-point measurement, deviation does not exceed ±0.05mm), adhesion test (crosshatch method or tape tearing method) and dielectric strength test (typical requirements are to withstand AC 3000V/minute without breakdown). For the Insulated Flexible Copper Bus Bar for Power Battery Pack used in power battery modules, additional bending durability tests and thermal shock cycle tests are required to verify the reliability of the insulation layer under long-term vibration and temperature changes of the battery pack.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Copper row dipping processing technology is widely used in fields such as power systems, transportation, new energy, and industrial manufacturing. In power distribution cabinets, plastic-impregnated busbars are used for insulation isolation between the main busbar and branch busbars to prevent short circuits between different phase sequences and to facilitate maintenance personnel's bare-hand operation (the insulation layer provides protection against electric shock). At the outlet end of the low-voltage side of the transformer, Busbar Isolation achieves electrical separation between each phase busbar through dipping treatment, so that the distance between phases can be further reduced, thereby reducing the size of the cabinet. In the field of new energy, Insulated Flexible Copper Bus Bar for Power Battery Pack is widely used for series or parallel connections between battery modules. The internal space of the battery pack is compact and full of electrolyte volatile gases. The chemical resistance and flame retardancy of the insulating material are extremely high, and the plastic-impregnated copper bar has become the preferred solution.

 

In the converter cabinet of wind power generation, the Dip Insulated Busbar is used to connect the generator output and the rectifier module. This environment contains high humidity, high salt spray (offshore wind turbines) and continuous mechanical vibration. The dipped plastic layer can effectively protect the copper bar from corrosion while providing sufficient electrical clearance. For export projects, Insulated Custom Copper Bus Bar with PVC Dipping can be designed differently according to the standards of the customer's country - for example, the North American market requires UL certified flame retardant grade, and the European market requires compliance with the rail transit fire protection standard of EN 45545-2. Soft Connection Copper Busbar is often used in situations where it is necessary to compensate for installation tolerances or absorb vibrations after being dipped in plastic, such as the connection between electric vehicle battery packs and high-voltage distribution boxes. The dipped layer not only provides insulation protection, but does not significantly increase the bending stiffness of the soft connection.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

We take full factory inspection, batch traceability and material compliance as the core delivery standards, and support customers to provide 3D drawings for customized Dip Insulated Busbar processing. Welcome to submit technical parameters or sample drawings, and our engineers will provide a manufacturability assessment and a sample delivery date.