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, Tinaga kaetud vasksiin 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

• Juhtivuse suurendamine ja stabiilsuse optimeerimine
• 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.
• Korrosioonikindluse suurendamine hüppeliselt
  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%.
• Jootmisprotsessi täiustamine
  Kui matttina katte pinna karedus (Ra väärtus) on 0,8–1,6 μm, suureneb jootmise nakketugevus rohkem kui 50% võrra ja usaldusväärse ühenduse saab teostada ilma räbustita. Tesla ülelaadija kasutab seda protsessi keevitamise efektiivsuse parandamiseks 3 korda.

2. Tinaga katmise protsess

• Hele tina: tasakaalustab esteetikat ja funktsiooni
  Sobib andmekeskuse toitejaotuskappidele ja muudele kõrget välimust nõudvatele stsenaariumidele, mille peegelläige (60° nurga all mõõdetuna) on 90GU või rohkem, kuid jootmisrakendusi tuleb vältida.
• Matt tina: ülim lahendus tööstuslike ühenduste jaoks
  Kõrgtemperatuuri vastupidavust saab tõsta 200°C-ni, kattes nikli aluskihi (paksus 2-5 μm), mida kasutatakse Ningde Timesi akumoodulites, vähendades defektse jootmise määra 0,02%-ni.
• Kuum tina: kaitsebarjäär ekstreemsete keskkondade jaoks
  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. Plaadi paksusega materjal

• Paksuse valik
  • Kuiv sisekeskkond: 12,5 μm (vastab GB/T 2423.17 soolapihustustesti 4. taseme standardile)
  • Niiske/tööstuslik keskkond: 25 μm (läbinud IEC 60068-2-11 raske taseme testi)
  • Keemiline/merekeskkond: ≥30 μm (vt NACE TM0172 standardit)
• C110 puhta vase asendamatus
  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. Kvaliteedikontroll

• Plaadi ühtluse test
  Röntgenikiirguse fluorestsentsspektromeetrit (XRF) kasutatakse paksuse kaardistamiseks, mis nõuab hälvet ≤±10% (vt ASTM B568 standardit).
• Liimimise test
  Läbige ISO 2819 järgi painutuskatse (180° painutamine ilma maha koorumiseta) ja termošoki test (tsükkel -40°C ~ 150°C 5 korda).
• Keskkonnakaitse protsessi uuendamine
  Juhtivad ettevõtted on kasutusele võtnud tsüaniidivaba tinaga katmise protsessid (nt tsitraatsüsteemid), mis vähendavad reovee toksilisust 90% võrra ja vastavad RoHS 3.0 standarditele.

5. Tööstusrakendus

1. Kõrgepingesüsteem uutele energiasõidukitele
   The BYD blade battery module adopts matte tin copper busbars, with contact resistance stabilized at below 0.15 mΩ, supporting 600 A continuous current.
2. PV-inverteri topoloogia optimeerimine
   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%.

Tehke kokkuvõte

Tehnoloogiline läbimurre tinatatud vasest siini 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.