Automotive Bus Bar
Products Description
Automotive Bus Bars are capacitor connection busbars manufactured using high-purity copper or copper alloys as the conductor substrate through precision forming and insulation coating processes. Their core structure consists of three parts:
Conductive layer: Handles high current transmission and rapid energy release
PET insulation layer: Provides electrical isolation, withstand voltage protection, and assembly safety
End functional area: Provides a reliable interface for welding, bolting, or plug-in connections
Compared to traditional bare copper or simple sleeve-type busbars, PET insulated paper busbars are better suited to the high reliability requirements of new energy vehicles in terms of structural integrity, spatial adaptability, and long-term operational stability.
Core Properties and Features of the Product
| Composite Structure Characteristics | Utilizing an integrated composite structure of "conductive substrate + PET insulating paper," the PET insulating paper adheres tightly to the surface of the conductive substrate, eliminating bubbles and peeling risks, and ensuring uniform and controllable insulation layer thickness. This structure retains the high conductivity of the conductive substrate while providing reliable insulation through the PET insulating paper, preventing short circuits between the capacitor busbar and surrounding components, and is suitable for the high-density installation requirements within the confined spaces of new energy vehicles. |
| Conductivity Characteristics of the Substrate | Using 99.99% high-purity electrolytic copper or high-conductivity aluminum as the core conductive substrate, it boasts excellent conductivity and is suitable for the high-current transmission requirements of high-frequency charging and discharging scenarios in new energy vehicle capacitors. The substrate possesses excellent ductility and mechanical strength, allowing for precision bending to adapt to complex capacitor installation layouts, while also withstanding minor vibrations and impacts during vehicle operation. |
| PET Insulation-Specific Characteristics | The matching PET insulating paper exhibits superior electrical insulation, high-temperature resistance, and aging resistance, operating stably within a wide temperature range of -40℃ to 120℃, suitable for the high and low temperature operating conditions of new energy vehicles. The insulating paper boasts high breakdown strength, effectively resisting voltage fluctuations during capacitor operation, and also possesses good chemical corrosion resistance, protecting against environmental factors such as oil and moisture inside the vehicle. |
| Scene Adaptability | Full-specification customization is supported. The cross-sectional dimensions, length, bending angle of the conductive substrate, as well as the coverage and thickness specifications of the PET insulating paper, can be customized according to the installation dimensions, current parameters, and voltage ratings of different new energy vehicle capacitor models. The product's compact structure allows for precise adaptation to the Copper Busbar for Electric Vehicle Capacitors installation requirements of different vehicle types, including passenger cars and commercial vehicles. |
Core Processes: Cleanroom Lamination and Vacuum Hot Pressing
Material Selection and Pre-treatment: We select high-purity, high-ductility rolled copper foil and high-temperature resistant, low-loss PET film from top global suppliers. All materials undergo rigorous surface cleaning and ion air dust removal before entering the cleanroom.
Class 1000 Cleanroom Precision Lamination: (Key Differentiator) The lamination process is completed in a Class 1000 cleanroom with constant temperature and humidity. A fully automated laminator, with micron-level precision, alternately stacks copper foil and PET film layer by layer, ensuring no dust, impurities, or air bubbles between layers. This is the lifeline for guaranteeing the electrical performance and insulation reliability of the final product.
Vacuum Hot Pressing: The stacked "books" are fed into a high-precision vacuum hot press. Under vacuum, through precisely controlled temperature, pressure, and time curves, the adhesive layer of the PET film is activated, firmly pressing the layers together to form a dense, gapless whole with uniform dielectric strength.
High-precision CNC machining and inspection: After lamination, the motherboard blocks are machined using high-precision CNC machine tools to create their outline, mounting holes, and countersunk holes. Each Copper Busbar for Hybrid Electric Vehicles Film Capacitor undergoes rigorous electrical performance testing (such as withstand voltage and insulation resistance), dimensional inspection, and visual inspection to ensure 100% compliance with design requirements.
Looking to the Future: Evolving Alongside Automotive Electrical Architecture
As vehicle electronic and electrical architectures evolve towards domain control and central computing, the role of Film Capacitor Copper Busbar for Electric Vehicles is also evolving:
Supporting Higher Frequencies: Adapting to the MHz-level switching frequencies of next-generation GaN devices places more stringent demands on the dielectric loss factor of insulating materials, further highlighting the low-loss advantages of PET.
Integrated Sensing Functions: Micron-level temperature or current sensing fibres can be pre-embedded in the PET insulation layer to achieve online intelligent monitoring of the bus status.
Closed-Loop Material Recycling: As a thermoplastic polyester, PET theoretically has the potential for chemical recycling, and we are working with partners to research its closed-loop recycling pathway in the automotive field.
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