
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, Förtennad kopparskena 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
- Konduktivitetsförbättring och stabilitetsoptimering
- 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.
- Uppgradering av korrosionsbeständigheten med stormsteg
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%. - Förbättring av lödningsprocessen
När ytråheten (Ra-värde) hos matt tennplätering kontrolleras till 0,8-1,6 μm, ökas bindningsstyrkan för lödning med mer än 50%, och en tillförlitlig anslutning kan realiseras utan flöde. Tesla Supercharger använder denna process för att förbättra svetseffektiviteten med 3 gånger.
2. Pläteringsprocessen
| Processtyp | Pläteringstjocklek (μm) | Konduktivitet (%IACS) | Scenarier | Kostnadsindex (bar koppar = 1) |
|---|---|---|---|---|
| Ljust plåt | 8-12 | 85-90 | Elcentraler, Exteriördelar | 1.8 |
| Matt tenn (lödbar) | 12-15 | 80-85 | Kontaktstycken, PCB Lödning | 2.2 |
| Hot Dip Tin | 25-40 | 75-80 | Utrustning, kemiska miljöer | 3.5 |
- Bright Tin: Balanserar estetik och funktion
Lämplig för strömfördelningsskåp för datacenter och andra scenarier som kräver en hög nivå av utseende, med en spegelglans (mätt i en 60° vinkel) på 90GU eller mer, men lödningstillämpningar måste undvikas. - Matt tenn: den ultimata lösningen för industriella anslutningar
Högtemperaturmotståndet kan ökas till 200°C genom att plätera ett nickelbasskikt (2-5μm tjocklek), som används i Ningde Times batterimoduler, vilket minskar den defekta lödningshastigheten till 0,02%. - Hot-dip plåt: en skyddande barriär för extrema miljöer
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. Plätering tjocklek material
- Val av tjocklek
- Torr inomhusmiljö: 12,5 μm (uppfyller GB/T 2423.17 saltspraytestnivå 4 standard)
- Fuktig/industriell miljö: 25μm (godkänd IEC 60068-2-11 strängt betygstest)
- Kemisk/marin miljö: ≥30μm (se NACE TM0172-standarden)
- Oersättbarhet av C110 ren koppar
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. Kvalitetskontroll
- Plätering enhetlighet test
Röntgenfluorescensspektrometer (XRF) används för tjocklekskartering, vilket kräver en avvikelse på ≤±10% (se ASTM B568-standarden). - Bindningstest
Klara böjningstestet (180° böjning utan att lossna) och termisk chocktest (-40°C~150°C cykel i 5 gånger) enligt ISO 2819. - Uppgradering av miljöskyddsprocessen
Ledande företag har antagit cyanidfria förtenningsprocesser (t.ex. citratsystem), som minskar toxiciteten hos avloppsvatten med 90% och uppfyller RoHS 3.0-standarderna.
5. Industriapplikation
- Högspänningssystem för nya energifordon
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-invertertopologioptimering
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%.
Sammanfatta
Det tekniska genombrottet för förtennad kopparskena 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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