PVC dipping copper busbar: process analysis, application differences, and selection guidelines

In the insulation treatment process system of copper busbars, impregnation molding is a widely used mainstream technology. According to the different insulation materials used, the process of impregnating epoxy resin powder is commonly referred to as "powder coating" in industry, while the process of impregnating liquid PVC adhesive is called "PVC impregnation". This article focuses on analyzing the latter. PVC dipping copper busbar refers to a product that uniformly covers the surface of copper busbar with liquid viscous insulation material through a specific process, forming a dense insulation protection layer. This process can significantly improve the insulation performance of copper busbars and provide safety guarantees for electrical connections.

At present, polyvinyl chloride (PVC) adhesive materials used in mainstream processes are made of PVC resin, plasticizer, stabilizer, filler and other ingredients, and they are in gel like fluid state at room temperature. This material has the advantages of low cost and good fluidity, making it suitable for large-scale industrial production. The working temperature range of PVC dipping insulated busbar can cover -40 ℃ to 125 ℃, and the insulation strength can reach 20-28kV/mm, fully meeting the basic insulation requirements in scenarios such as power batteries and energy storage systems.

Although PVC dipping copper busbars play an important role in electrical systems, their application levels vary significantly in different scenarios. Overall, this product is more commonly used in energy storage systems and has relatively less application in power battery packs. The core reason is closely related to the process characteristics and scenario requirements. In the field of power batteries, the application of impregnated copper busbars is constrained by two aspects:

Firstly, the power battery pack has extremely strict requirements for space and weight. The immersion layer will increase the thickness and weight of the busbar, which is not conducive to installation in small spaces such as BDUs (battery disconnect units) and battery modules, and will also affect the improvement of energy density;

Secondly, the battery generates a large amount of heat during the charging and discharging process, and the insulation layer hinders heat dissipation, which may lead to local high temperatures and affect system safety. In contrast, energy storage systems have more relaxed restrictions on space and weight, relatively fixed installation methods, and focus more on long-term stability and safety during operation.

Insulated custom copper bus bar with PVC dipping has excellent insulation and corrosion resistance, and can adapt to the common humid and dusty environment of energy storage power stations. Its high insulation performance can effectively reduce the risk of leakage and meet the high requirements of energy storage systems for safety redundancy.

Insulated flexible copper bus bar for power battery pack exhibits stable insulation performance. After immersion treatment, the product can withstand voltages of 3500V AC/DC and above, effectively preventing leakage current, which is also one of the core requirements for achieving electrical isolation of busbars. Thanks to the good fluidity of PVC adhesive, the insulation layer can uniformly cover copper busbars with complex shapes, and the coating consistency is high. At the same time, the coating has strong adhesion and a peel strength of over 4N/cm, which is not easy to peel off and can adapt to harsh working conditions such as vibration and environmental changes. For scenarios that require flexible connections, impregnating copper busbars with flexible connections can ensure insulation performance while maintaining a certain degree of flexibility.

In addition, the temperature resistance level of the Plastic dipping copper busbar covers -40 ℃ to 125 ℃, and the insulation layer thickness can be adjusted within 1-2mm on one side, which can effectively resist the erosion of moisture and dust. In the 192 hour salt spray test conducted in a 5% NaCl solution at 35 ℃, the product exhibited excellent corrosion resistance.

The PVC impregnation process itself determines several key characteristics of Plastic dipping electric copper busbar custom made, which directly affect the adaptability in different application scenarios.

On the one hand, the impregnation process can adapt to copper busbars with complex shapes, and the insulation layer has no joints and strong adhesion, making it suitable for long-term reliable operation in fixed installation environments.

On the other hand, the impregnation layer has a certain thickness and weight, and has low thermal conductivity, which becomes a significant disadvantage in compact and high heat generating power battery packs. Therefore, in scenarios that require high energy density and efficient heat dissipation, designers often prioritize insulation solutions such as heat shrink tubing and insulation paper that are thinner or more conducive to heat dissipation. In energy storage and distribution scenarios that are insensitive to volume and weight but require high long-term insulation stability and environmental adaptability, Soft connection copper busbars demonstrate higher engineering value.

If you are developing energy storage or distribution system projects and have specific requirements for the selection and customization of the PVC dipping copper busbars, please feel free to communicate with us at any time. We will provide you with professional technical advice and engineering support.