Dead-soft tin-coated copper belt for solar cell

Abstract

The invention relates to a dead-soft tin-coated copper belt for a solar cell. The dead-soft tin-coated copper belt comprises a copper material substrate and alloy coatings, wherein the alloy coatings are uniformly coated on the front and the back surfaces of the copper material substrate to form the tin-coated copper belt. The thickness of each of the front alloy coating and the back alloy coating on the copper material substrate is 0.01-0.03mm. The tin-coated copper belt has the yield strength being less than or equal to 50 N / mm<2>, the tensile strength being larger than or equal to 135 N / mm<2>, and the percentage elongation of being larger than or equal to 15%. The tin-coated copper belt is clung to the solar cell when being soldered with the solar cell, thus insufficient soldering, desoldering and deviation soldering caused by coiling and arching are avoided, power generation efficiency of the solar cell can be comprehensively increased, fragment rate is reduced, cost is saved and profit space is expanded for customers, and the product competitiveness is also improved.

Description

technical field [0001] The invention relates to an extremely soft tin-coated copper strip, in particular to a key component in a solar cell module, and belongs to the technical field of mechanical equipment. Background technique [0002] Solar cells are a very promising new power source, which has three advantages of permanence, cleanliness and flexibility. Solar cells have a long service life. As long as the sun exists, solar cells can be used for a long time with one investment; compared with thermal power generation and nuclear power generation, solar cells will not cause environmental pollution; A medium-sized power station of 10,000 kilowatts, as small as a solar battery pack for one household, is unmatched by other power sources. With the rise of the domestic photovoltaic industry, cells as the core of photovoltaic modules have become the focus of the entire photovoltaic industry. How to reduce its cost, increase the power generation rate, and reduce the fragmentatio...

AI Technical Summary

Problems solved by technology

Tin-coated copper strips need high-temperature assistance when connecting to batteries. Under the action of high temperature, thermal stress changes will occur between the connecting wire (tin-coated copper strips) and batteries. Due to the difference in thermal stress, the batteries will change during cooling. Different degrees of deformation (warpage) occur, and the thinner the battery sheet, the more serious the deformation (warpage). This deformation (warpage) will cause cracks or fragments in the subsequent process of making solar panel lamination, which will directly affect the components. power generation efficiency and cost

And in manual welding, affected by the stress of the tin-coated strip itself, the tin-coated strip will warp and seriously affect the welding efficiency and welding effect

The current mainstream tin-coated copper strip has a large stress (mainly reflected in the hardness and yield strength of the finished product). When the customer uses it, the stress is released due to the influence of heat, and the stress retracts during the cooling process to drive the cell to retract, causing the cell to shrink. Deformation, flow into the next process will cause cracks and debris

If it is in manual welding, it will also cause curling or arching due to the stress of the tin-coated copper strip, which will affect the welding quality and reduce the welding efficiency.

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