Your Premier Copper Bus bar Manufacturer & Supplier

Our factory focuses on providing customers with customized copper busbar, with full-process guarantee from solution design to production delivery:
✅ Precise Manufacturing: support any specification shaped copper busbar processing, provide parameter design assistance and fast sample delivery service;
✅ Surface treatment: optional tin plating (oxidation resistance)/nickel plating (corrosion resistance)/silver plating (high-frequency low-resistance) and other processes, the contact resistance is reduced by 25%-40%;
✅ Quality Verification: Implementing ISO 6892 mechanical strength test and IEC 60439 electrical performance test.
✅ Agile Delivery: 10,000 square meters level raw material warehousing, regular order production cycle ≤ 5 days, 48 hours expedited channel for urgent orders;
✅ Value-added services: Provide all types of secondary processing: precision cutting (±0.2mm), three-dimensional bending (angular accuracy ±0.5°), laser marking (corrosion-resistant marking)

All products come with material certificates, test reports and IP protection certificates, welcome to inquire for customized solutions to experience the reliability and energy efficiency upgrade of high-end electrical connection systems.

Tin Plated Copper Bus bar

Copper Battery Bus Bar

Nickel Plated Copper Bus bar

Bare Copper Busbar

Silver Plated Copper Bus Bar

Flat Insulated Solid Copper Busbar

Copper Bus Bar For EV Battery

Tin Coated Copper Busbar

Braided Copper Busbar

Your Professional Copper Bus bar Supplier

Basic material selection criteria

According to GB/T 2040-2017 standard, industrial commonly used copper materials can be divided into three categories :

Specialty Copper Alloy Development Trends

In response to the demand for 800V high-voltage platforms for new energy vehicles, copper-chromium-zirconium (CuCrZr) alloy busbars have achieved a breakthrough in electrical conductivity of 55 MS/m and tensile strength of 450 MPa[^Industry News]. The successful application of this type of material in the Tesla Supercharger pile has reduced charging loss by 2.3 percentage points.

Analysis of the whole process of advanced manufacturing technology

a. Precision processing technology innovation

Based on the requirements of GB/T 5585.1 standard, modern copper row processing forms five core technologies (Figure 1):

Precision shear: laser cutting technology to achieve ± 0.05mm tolerance, compared with the traditional punching and shearing process to improve efficiency by 3 times.
Intelligent bending: the application of six-axis robot bending system, can complete the minimum internal angle R = 1.5t (t is the thickness of the material) of the complex modeling
Nano-punching: development of stepped multi-station molds, realizing Φ2mm micro-hole array processing, hole distance accuracy of ±0.1mm.

b. Surface treatment technology breakthroughs

Compare the key performance indicators of different plating processes:

Smart Packaging Solution Innovation

a.Anti-oxidation packaging system

Adopt VCI vapor phase antirust technology with PE vacuum packaging:

• Oxygen content control <0.1%
• Maintain humidity ≤10%RH
• Antioxidant validity is extended to 3 years.

b.Intelligent Traceability System

The integrated RFID chip is realized in the packaging box:

• Production batch traceability accuracy up to 100%
• Real-time monitoring of logistics status
• Automatic docking of inventory management system

Industry Application Cases and Benefit Analysis

A.Data center power transformation project

After adopting silver-plated copper busbar in a supercomputing center, the power loss was reduced by 2.1kW/machine:

• Reduced power loss by 2.1kW/cabinet.
• Annual electricity cost savings exceeded $12,000.
• System stability increased to 99.999%.

B.New Energy Vehicle Battery Pack Connection Solution

Innovative copper-chromium-zirconium alloy busbar application makes:

• 15% weight reduction of battery system
• Fast charging efficiency increased by 18
• Cycle life exceeds 5000 times

Direction of Future Technology Development

a.Superconducting copper matrix composites

Laboratory stage has been realized:

• Critical current density of 77K temperature zone 1×10^5 A/cm².
• Mechanical strength increased to 580MPa

b.Green Manufacturing Process

Development of electrolysis-rolling integrated equipment, enabling:

• Energy consumption is reduced by 35%.
• Copper material utilization rate increased to 99.2%.
• Zero wastewater discharge

About Us As an ISO 9001:2015 and IATF 16949 certified specialized manufacturer, we offer:

• 72-hour rapid sample service
• 0.005mm precision machining capability
• 12 customized solutions for surface treatment .

What is the coating on copper bus bars?

The coating on copper busbars serves several essential purposes, primarily aimed at enhancing durability, conductivity, and protection against corrosion. Here are some common coatings used on copper busbars:

Tin Plating: Tin plating is a common coating used to protect copper busbars from oxidation and corrosion. It forms a thin layer of tin over the copper surface, improving electrical conductivity and resistance to environmental elements.

Nickel Plating: Nickel plating provides excellent corrosion resistance and durability. It is often used in environments where busbars are exposed to harsh conditions or where abrasion resistance is required.

Silver Plating: Silver is known for its superior electrical conductivity. Silver-plated copper busbars offer enhanced electrical performance while also providing some level of corrosion resistance.

Tin-Plated with Nickel Undercoat (Tin-Nickel): This combination provides both the corrosion resistance of nickel and the solderability and conductivity of tin. It is suitable for applications requiring robust protection against corrosion and mechanical wear.

Epoxy Coatings: Epoxy coatings are applied to copper busbars to provide insulation and protection against moisture and contaminants. Epoxy coatings can enhance the busbar’s mechanical strength and resistivity to harsh environments.

What Entails Manufacturing of Copper Bus bars?

As the core conductive element of the power system, the manufacturing process of copper busbar directly determines the safety and efficiency of electrical equipment. This paper is based on international standards and industry practice, combined with authoritative data and process flow, systematic analysis of the key aspects of copper busbar manufacturing, covering material selection, smelting and casting, precision machining, and quality control, and the introduction of electrical conductivity, tensile strength, and other core parameters of the comparison, to provide technical reference for the industry.

1. Material selection: high purity and composition control

The conductivity of the copper bus is closely related to the purity. International standards (GB/T 5231-2022) provide that T1 copper content needs to be ≥ 99.95%, while the EU EN 13601 standard requires copper conductivity ≥ 101% IACS (International Annealed Copper Standard). For example, Shandong Zhongjia New Material Co., Ltd. adopts oxygen-free copper process, with copper and silver content of over 99.97% and oxygen content ≤ 0.001%, which ensures the conductivity as high as 102% IACS.

Data comparison:

2. Melting and casting: vacuum environment and temperature control

The melting stage needs to be completed in a vertical high-frequency induction furnace with the temperature controlled at 1140–1160 °C. Charcoal covers the melting furnace (thickness 100-150mm) to isolate oxygen and avoid oxidized impurities. Upper lead continuous casting process adopts graphite crystallizer, traction speed 500-1500mm/min, to ensure that the diameter of oxygen-free copper rods 20-30mm, oxygen content <0.001%.

3. Rolling and molding: precision and mechanical property enhancement

• Hot rolling and cold rolling: hot rolling reduces the thickness of copper billet to the target size, and cold rolling further optimizes the surface flatness (roughness Ra≤1.6μm).
• bending process: vertical bending allows bending radius ≥ 2 times the thickness of the busbar, flat bending radius ≥ 1.5 times the width, to avoid cracks and wrinkles. Multi-piece bus bar bending needs to maintain a uniform gap, error ≤ 0.5mm.

4. Annealing: stress relief and ductility optimization

Annealing temperature needs to be adjusted according to the state of copper: soft copper (TMY-R) annealed at 250-300 ℃, hard copper (TMY-Y) needs 350 ℃ to restore ductility. Tensile strength after treatment ≥206MPa, elongation ≥35%.

5. Surface treatment: anti-corrosion and conductive enhancement

• Tin plating / tin-lining: contact surface tin thickness ≥ 5μm, to improve corrosion resistance (salt spray test ≥ 500 hours).
• Insulation treatment: heat-shrinkable tubing (e.g. polyolefin material) voltage resistance level ≥ 10kV, adapt to high temperature and high humidity environment.

6. Precision processing: CNC technology and size control

• Punching and drilling: Hole diameter error ≤ 0.5mm, chamfer depth ≤ 0.8mm, to avoid burrs affecting conductivity.
• Automated cutting: CNC equipment ensures length tolerance ±1mm and angle deviation ≤0.5°.

7. Quality control: full-process testing system

• Conductivity test: four-probe method is used to detect resistivity (standard value ≤ 0.01777Ω-mm²/m).
• Mechanical properties: tensile strength test (hard state copper ≥275MPa), bending fatigue test (≥5000 cycles).
• Appearance inspection: no scratches and oxidized spots on the surface, flatness ≤ 3mm/m.

What are the common sizes of copper bus bars?

1. Thickness and Width

Copper bus bars are available in a variety of thickness and width combinations, common sizes include

• 6mm × 25mm (1/4" × 1"): suitable for small switchboards and low current scenarios.
• 10mm × 50mm (3/8" × 2"): for medium-sized systems with moderate current requirements.
• 25mm × 100mm (1" × 4"): For large industrial systems with high current loads.
• 50mm × 200mm (2" × 8") and above: Designed for heavy industrial equipment and large-scale power distribution.
• Other customized sizes: e.g. 5mm × 10mm, 25 × 3mm, 40 × 4mm, etc.
  

  2. Cross-sectional area

  The cross-sectional area directly affects the current-carrying capacity. Common ranges are as follows

• 50-500mm²: Residential and light commercial applications.
• 500-2000mm²: Industrial and large commercial distribution systems.
• 2000mm²: High current scenarios such as power stations.
• Heat Balance Calculation: It is necessary to consider the ambient temperature, heat dissipation area and resistance (e.g. formula \( R = \\frac))

3. Rated Current

• Standard range: 100A to 2000A
• High current specification: Special design busbars up to 25,000A (e.g. optimized by parallel connection of several groups or cooling).
• Current-carrying density: Copper busbars are usually designed for 1.2 A/mm (line current) or 1.7 A/mm² (face current) (subject to adjustment for temperature correction factor according to DIN 43 671).

4. Length

1. Customized cuts: can be cut to suit control cabinets or panels on request (e.g. 150mm short connector strip or 5m long straight section).

5. Customized design

• Shape: In addition to rectangular shape, it can be customized to L-shape, C-shape and other shaped sections.
• Thermal simulation support: mathematical modeling to analyze steady state temperature distribution and contact resistance effects.

6. Key design references

• DIN 43 671: Correction factor for adjusting the effect of ambient temperature on the flow rate.
• Thermal dissipation modeling: balance between cross-sectional area and surface area for heat dissipation is key