
With the rapid development of the new energy industry, the high-current scenario requires increasingly stringent performance of conductive components. With its excellent conductivity, corrosion resistance, and solderability, Kalay kaplı bakır bara has become the core component of new energy vehicles, photovoltaic power generation, and other fields. This article starts from the scientific principles of tin-plating process, combined with 7 technical dimensions, in-depth analysis of the selection criteria and application strategy of the tinned copper busbar, and authoritative data comparison to provide enterprises with landing solutions.
1. Benefits of tinned copper busbar
- İletkenliğin artırılması ve kararlılığın iyileştirilmesi
- The conductivity of copper itself is as high as 58 S/m, but the conductivity of copper oxide on the surface decreases significantly. After tin plating, tin oxide (SnO₂) has better conductivity than copper oxide (CuO), which can reduce the contact resistance by up to 30%. Experimental data show that the temperature rise of tin-plated copper busbars is 15-20% lower than that of bare copper busbars(under the same current), which significantly reduces power loss.
- Korozyon direncinin hızla yükseltilmesi
In the salt spray test, the thickness of the tin-plated layer ≥ 25 25μm copper busbar can withstand 1000 hours without corrosion, far more than the limit of 72 hours of bare copper. For example, in coastal photovoltaic power plants, the service life of tinned copper busbars can be extended to more than 15 years, reducing maintenance costs by 40%. - Lehimleme işleminin iyileştirilmesi
Mat kalay kaplamanın yüzey pürüzlülüğü (Ra değeri) 0,8-1,6 μm'de kontrol edildiğinde, lehimlemenin bağlanma mukavemeti 50%'den daha fazla artar ve akı olmadan güvenilir bir bağlantı gerçekleştirilebilir. Tesla Supercharger bu işlemi kaynak verimliliğini 3 kat artırmak için kullanır.
2. Kalay kaplama işlemi
| İşlem Türü | Kaplama Kalınlığı (μm) | İletkenlik (%IACS) | Senaryolar | Maliyet Endeksi (Çıplak Bakır = 1) |
|---|---|---|---|---|
| Parlak teneke | 8-12 | 85-90 | Şalt Panoları, Dış Parçalar | 1.8 |
| Mat Kalay (Lehimlenebilir) | 12-15 | 80-85 | Bağlantı Parçaları, PCB Lehimleme | 2.2 |
| Sıcak Daldırma Kalıbı | 25-40 | 75-80 | Ekipman, Kimyasal Ortamlar | 3.5 |
- Bright Tin: Estetik ve İşlevselliğin Dengelenmesi
Veri merkezi güç dağıtım kabinleri ve yüksek görünüm gerektiren diğer senaryolar için uygundur, 60° açıyla ölçüldüğünde 90GU veya daha fazla ayna parlaklığına sahiptir, ancak lehimleme uygulamalarından kaçınılması gerekir. - Mat teneke: Endüstriyel bağlantılar için nihai çözüm
Ningde Times pil modüllerinde kullanılan nikel taban katmanı (2-5μm kalınlığında) kaplanarak yüksek sıcaklık dayanımı 200°C'ye kadar artırılabilir ve hatalı lehimleme oranı 0,02%'ye düşürülebilir. - Sıcak daldırma kalay: aşırı ortamlar için koruyucu bir bariyer
In offshore wind power projects, 40μm hot-dip tinned copper busbars are 10 times more resistant to sulfide corrosion than bare copper, which is especially suitable for industrial environments containing H₂S.
3. Kaplama kalınlığı malzemesi
- Kalınlık seçimi
- Kapalı kuru ortam: 12,5 μm (GB/T 2423.17 tuz püskürtme testi seviye 4 standardını karşılar)
- Nemli/endüstriyel ortam: 25μm (IEC 60068-2-11 şiddetli sınıf testini geçti)
- Kimyasal/deniz ortamı: ≥30μm (NACE TM0172 standardına bakın)
- C110 saf bakırın yeri doldurulamazlığı
C110 copper busbars with copper content ≥99.9%, conductivity up to 101% IACS, and bending formability 3 times higher than brass are the best substrates for the tin-plating process. An ultra-high voltage substation project was measured to show that the C110 copper busbar of the current-carrying capacity of 22% higher than the alloy copper.
4. Kalite kontrol
- Kaplama düzgünlüğü testi
Kalınlık haritalaması için X-ışını floresan spektrometresi (XRF) kullanılır ve ≤±10% sapma gerektirir (ASTM B568 standardına bakın). - Bağlanma testi
ISO 2819'un öngördüğü bükme testini (soyulmadan 180° bükme) ve termal şok testini (-40°C~150°C'de 5 kez çevrim) geçmiştir. - Çevre koruma süreci yükseltmesi
Önde gelen şirketler, atık suyun toksisitesini % oranında azaltan ve RoHS 3.0 standartlarına uygun siyanürsüz kalay kaplama proseslerini (örneğin sitrat sistemleri) benimsemiştir.
5. Endüstri Uygulaması
- Yeni enerji araçları için yüksek gerilim sistemi
The BYD blade battery module adopts matte tin copper busbars, with contact resistance stabilized at below 0.15 mΩ, supporting 600 A continuous current. - PV İnverter Topolojisi Optimizasyonu
Sunny Power’s latest string inverter uses tinned copper busbars to increase the power density to 1.5W/cm³, and the efficiency breaks through 99%.
Özetle
Teknolojik atılım kalaylı bakır bara busbars is reshaping the competitive landscape of the new energy industry. From the quantum-level optimization of electrical conductivity to the reliability of extreme environments, the scientific selection of plating processes and thicknesses has become the core strategy of cost reduction and efficiency. With the strategic deployment of high-end materials, the tinned copper busbar will accelerate to aerospace, smart grid and other cutting-edge areas of penetration, opening a new era of conductive components.
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Introduction Copper busbars and aluminum busbars are the two most commonly used conductive materials in the field of power systems and industrial distribution. Due to differences in cost, resource availability, and technical requirements, they often need to be connected and used in practical applications. However, directly connecting copper aluminum busbars can pose serious safety hazards.







