Photovoltaic V-shaped composite welding strip

Abstract

A photovoltaic V-shaped composite solder strip comprises an alloy copper sheet layer, an alloy aluminum shell layer, an alloy calcium powder layer, soldering tin, a rectangular solder groove and a twill V-shaped groove, the alloy aluminum shell layer is a rectangular shell, and the alloy calcium powder layer is filled in the middle of the alloy aluminum shell layer; the periphery of the alloy aluminum shell layer is coated with an alloy copper sheet layer; four sides of the alloy copper sheet layer are provided with edges; a sloping grain V-shaped groove is formed in the surface A; the surface B is provided with a rectangular solder groove; the middle part of the surface B is provided with alloy copper sheet layers on two sides welded by soldering tin; the left side face and the right side face of the alloy copper sheet layer are smooth faces parallel to each other. The beneficial effects are that the device is low in cost, high in conductivity, low in fault rate, low in use and maintenance cost, and long in service life; the cost of photovoltaic products can be reduced, application and popularization of the photovoltaic products are promoted, and immeasurable beneficial effects are brought to development of ecological energy and environmental protection.

Description

Technical Field

[0001] The present invention relates to a welding strip for photovoltaic applications, and in particular to a V-shaped composite welding strip for photovoltaic applications. Background Art

[0002] The V-shaped composite welding strip for photovoltaic applications, due to the V-shaped structure on the surface, can save costs, reduce weight, enhance the light reflection effect, thereby improving the collection and utilization efficiency of light energy, etc. Therefore, it is widely promoted and applied in the photovoltaic industry. However, due to the structural reasons of the V-shaped groove, several fine crack defects will occur at the wave crest of the V-shaped groove during winding and unwinding. The several fine cracks at the wave crest of the V-shaped groove affect the conductivity of the welding strip and also affect the service life of the welding strip.

[0003] In addition, there are problems of gaps and poor welding between the existing technology welding strip and the photovoltaic panel, resulting in problems such as decreased conductivity of the welding strip, short service life, high failure rate, and high maintenance cost.

[0004] In addition, the existing technology photovoltaic V-shaped composite welding strip has a high cost, and there is a need to reduce the cost to promote and utilize photovoltaic ecological energy.

[0005] In addition, due to the alloy material and cost problems of the existing technology photovoltaic V-shaped composite welding strip, there are problems of low material cost but high resistivity, and high resistivity but high material cost. Further improvement is needed in reducing the material cost and lowering the resistivity of the alloy. Summary of the Invention

[0006] The present invention provides a V-shaped composite welding strip for photovoltaic applications, which can solve the problems mentioned in the background art and achieve the effects of reducing costs, improving welding quality, reducing resistivity, improving conductivity, and increasing service life.

[0007] The technical solution for the present invention to solve its technical problems is as follows: 1. Set the line direction of the V-shaped groove on the A side of the V-shaped composite welding strip for photovoltaic applications, that is, the V-shaped groove surface with the V-shaped groove, as an inclined V-shaped groove, that is, the V-shaped groove is not parallel or perpendicular to the side line of the welding strip; its function is to avoid the crack defects and the defects of reducing the conductive cross-sectional area caused by winding and unwinding of the welding strip, thereby improving the conductivity, enhancing the service performance, and increasing the service life; 2. Set a rectangular solder groove on the B side of the V-shaped composite welding strip for photovoltaic applications, that is, the surface for welding with the battery panel, and its function is to facilitate the stable filling of solder, enable the solder to be evenly distributed on the welding strip, improve the welding quality, enhance the conductivity, and reduce the failure rate; 3. Set the composition of the welding strip as a composite structure in which a copper alloy layer wraps an aluminum alloy layer, and the aluminum alloy layer wraps calcium alloy powder. The function of the aluminum alloy layer is to reduce the production cost, and the function of the calcium alloy powder is to further reduce the production cost.

[0008] According to the above technical solution, a V-shaped composite solder strip for photovoltaic use in the present invention includes an alloy copper skin layer, an alloy aluminum shell layer, and an intermediate alloy calcium powder layer; the alloy copper skin layer has four sides; the A side is provided with an inclined V-shaped groove; the B side is provided with a rectangular solder groove; in the middle of the B side, there is solder for welding the two sides of the alloy copper skin layer; the left and right side surfaces of the alloy copper skin layer are smooth surfaces parallel to each other.

[0009] The material composition of the alloy copper skin layer includes red copper, phosphorus, zinc, and tin.

[0010] The material composition of the alloy aluminum shell layer includes aluminum, zinc, and lead.

[0011] The material composition of the alloy calcium powder layer includes calcium powder, silicon powder, aluminum powder, and lead powder.

[0012] Further, the angle ∠A between the bottom line of the inclined V-shaped groove on the A side of the V-shaped composite solder strip for photovoltaic use and the side surface of the V-shaped composite solder strip for photovoltaic use is 20°-80°.

[0013] Further, the inner angle of the V-shaped groove bottom angle of the inclined V-shaped groove on the A side of the V-shaped composite solder strip for photovoltaic use is: 30°-90°.

[0014] The production process of a V-shaped composite solder strip for photovoltaic use in the present invention includes prefabrication of alloy copper strip, prefabrication of alloy aluminum strip, prefabrication of alloy calcium powder, and synthetic molding process; the prefabricated alloy calcium powder, alloy aluminum strip, and alloy copper strip are compounded, drawn, molded, tractioned, and wound through the synthetic molding process to be made into a V-shaped composite solder strip for photovoltaic use with an alloy aluminum shell layer wrapped by an alloy copper skin layer, an alloy calcium powder layer wrapped by the alloy aluminum shell layer, an inclined V-shaped groove on the A side; and a rectangular solder groove on the B side.

[0015] The prefabrication of the alloy copper strip is as follows: 90-95% of red copper, 1.5-3% of phosphorus, 2-4.5% of zinc, and 1.5-2.5% of tin are mixed evenly, and after melting, die casting, heat treatment, die drawing, pickling, and winding, an alloy copper strip is made and reserved; or an alloy copper strip is customized or purchased according to the material ratio composition and reserved.

[0016] The prefabrication of the alloy aluminum strip is as follows: 88-93% of aluminum, 4.5-6.5% of zinc, and 2.5-5.5% of lead are mixed evenly and melted, and then after die casting, drawing, pickling, and winding, an alloy aluminum strip is made and reserved; or an alloy aluminum strip is customized or purchased according to the material ratio composition and reserved.

[0017] The prefabrication of the alloy calcium powder: 72-85% of calcium powder, 3.5-8% of silicon powder, 6.5-12% of aluminum powder, and 2-5% of lead powder are mixed and stirred evenly. The particle sizes of the calcium powder, silicon powder, aluminum powder, and lead powder are 100-500 mesh and reserved; or an alloy calcium powder is customized or purchased according to the material ratio composition and reserved.

[0018] The beneficial effects of the present invention are: low cost, high conductivity, low failure rate, low use and maintenance cost, and long service life; it can reduce the cost of photovoltaic products, promote the application and popularization of photovoltaic products, and bring inestimable beneficial effects to the development of ecological energy and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structure diagram of a V-shaped composite solder strip for photovoltaic use.

[0020] Figure 2 is Figure 1 the front view of

[0021] Figure 3 is Figure 1 the top view of

[0022] Figure 4 is Figure 1 the bottom view of

[0023] Figure 5 is Figure 2 the sectional view taken along the line A-A of

[0024] Figure 6 It is the production process diagram of the present invention.

[0025] In the figure, the markings are: 1. alloy copper skin layer; 2. alloy aluminum shell layer; 3. alloy calcium powder layer; 11. solder; 12. rectangular solder groove; 13. inclined V-shaped groove. DETAILED DESCRIPTION OF THE INVENTION

[0026] The present invention will be specifically described below with reference to the drawings and embodiments.

[0027] In Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , a V-shaped composite solder strip for photovoltaic use according to the present invention includes an alloy copper skin layer (1), an alloy aluminum shell layer (2), an alloy calcium powder layer (3), solder (11), a rectangular solder groove (12), and an inclined V-shaped groove (13).

[0028] The alloy aluminum shell layer (2) is a rectangular shell, and the alloy calcium powder layer (3) is filled in the middle; the alloy copper skin layer (1) is wrapped around the periphery of the alloy aluminum shell layer (2); the alloy copper skin layer (1) has four sides with edges; the A surface has an inclined V-shaped groove (13); the B surface has a rectangular solder groove (12); the solder (11) is welded to the alloy copper skin layer (1) on both sides in the middle of the B surface; the left and right side surfaces of the alloy copper skin layer (1) are smooth surfaces parallel to each other.

[0029] Further, the angle ∠A formed by the bottom line of the inclined V-shaped groove (13) on the A side of the V-shaped composite solder strip for photovoltaic applications and the side surface of the V-shaped composite solder strip for photovoltaic applications is 20°-80°.

[0030] Further, the thickness of the alloy copper skin layer (1) is 0.3-2 mm.

[0031] Further, the thickness of the alloy aluminum shell layer (2) is 0.3-2 mm.

[0032] Further, the thickness of the alloy calcium powder layer (3) is 0.5-8 mm.

[0033] Further, the inner angle of the V-shaped groove bottom angle of the inclined V-shaped groove (13) on the A side of the V-shaped composite solder strip for photovoltaic applications is: 30°-90°.

[0034] Further, the groove width of the rectangular solder groove (12) on the B side of the V-shaped composite solder strip for photovoltaic applications is: 1.5-8.5 mm, and the groove depth is: 0.3-1.5 mm.

[0035] The material composition of the alloy copper skin layer (1) is: 90-95% of red copper, 1.5-3% of phosphorus, 2-4.5% of zinc, and 1.5-2.5% of tin.

[0036] The material composition of the alloy aluminum shell layer (2) is: 88-93% of aluminum, 4.5-6.5% of zinc, and 2.5-5.5% of lead.

[0037] The material composition of the alloy calcium powder layer (3) is: 72-85% of calcium powder, 3.5-8% of silicon powder, 6.5-12% of aluminum powder, and 2-5% of lead powder.

[0038] The specific embodiment 1 is as follows:

[0039] In Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 Among them, a V-shaped composite solder strip for photovoltaic applications of the present invention includes an alloy copper skin layer (1), an alloy aluminum shell layer (2), an alloy calcium powder layer (3), solder (11), a rectangular solder groove (12), and an inclined V-shaped groove (13).

[0040] The alloy aluminum shell layer (2) is a rectangular shell, and the alloy calcium powder layer (3) is filled in the middle; the periphery of the alloy aluminum shell layer (2) is wrapped with the alloy copper skin layer (1); the alloy copper skin layer (1) has four sides with edges; the A side has an inclined V-shaped groove (13); the B side has a rectangular solder groove (12); the solder (11) in the middle of the B side welds the alloy copper skin layers (1) on both sides; the left and right side surfaces of the alloy copper skin layer (1) are smooth surfaces parallel to each other.

[0041] Further, the inner angle formed by the bottom line of the inclined V-shaped groove (13) on the A side of the V-shaped composite solder strip for photovoltaics and the side surface of the V-shaped composite solder strip for photovoltaics is 25°.

[0042] Further, the thickness of the alloy copper skin layer (1) is 0.5 mm.

[0043] Further, the thickness of the alloy aluminum shell layer (2) is 1 mm.

[0044] Further, the thickness of the alloy calcium powder layer (3) is 3 mm.

[0045] Further, the inner angle of the V-shaped groove bottom angle of the inclined V-shaped groove (13) on the A side of the V-shaped composite solder strip for photovoltaics is: 40°.

[0046] Further, the groove width of the rectangular solder groove (12) on the B side of the V-shaped composite solder strip for photovoltaics is: 4 mm, and the groove depth is: 0.4 mm.

[0047] The material composition of the alloy copper skin layer (1) is: 95% of red copper, 1.5% of phosphorus, 2% of zinc, and 1.5% of tin.

[0048] The material composition of the alloy aluminum shell layer (2) is: 93% of aluminum, 4.5% of zinc, and 2.5% of lead.

[0049] The material composition of the alloy calcium powder layer (3) is: 72% of calcium powder, 8% of silicon powder, 12% of aluminum powder, and 2% of lead powder.

[0050] Specific Example 2 is as follows:

[0051] In Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 , a V-shaped composite solder strip for photovoltaics according to the present invention includes an alloy copper skin layer (1), an alloy aluminum shell layer (2), an alloy calcium powder layer (3), solder (11), a rectangular solder groove (12), and an inclined V-shaped groove (13).

[0052] The alloy aluminum shell layer (2) is a rectangular shell filled with an alloy calcium powder layer (3) in the middle; the periphery of the alloy aluminum shell layer (2) is wrapped with an alloy copper skin layer (1); the alloy copper skin layer (1) has four sides with edges; the A side has an inclined V-shaped groove (13); the B side has a rectangular solder groove (12); the solder (11) in the middle of the B side welds the alloy copper skin layers (1) on both sides; the left and right side surfaces of the alloy copper skin layer (1) are smooth surfaces parallel to each other.

[0053] Further, the inner angle formed by the bottom line of the diagonal V-shaped groove (13) on the A side of the V-shaped composite solder strip for photovoltaic applications and the side surface of the V-shaped composite solder strip for photovoltaic applications is 40°.

[0054] Further, the thickness of the alloy copper skin layer (1) is 1 mm.

[0055] Further, the thickness of the alloy aluminum shell layer (2) is 2 mm.

[0056] Further, the thickness of the alloy calcium powder layer (3) is 5 mm.

[0057] Further, the inner angle of the V-shaped groove bottom angle of the diagonal V-shaped groove (13) on the A side of the V-shaped composite solder strip for photovoltaic applications is: 45°.

[0058] Further, the groove width of the rectangular solder groove (12) on the B side of the V-shaped composite solder strip for photovoltaic applications is: 6 mm, and the groove depth is: 0.6 mm.

[0059] The material composition of the alloy copper skin layer (1) is: 93% of electrolytic copper, 1.5% of phosphorus, 3% of zinc, and 2.5% of tin.

[0060] The material composition of the alloy aluminum shell layer (2) is: 90% of aluminum, 5.5% of zinc, and 4.5% of lead.

[0061] The material composition of the alloy calcium powder layer (3) is: 80% of calcium powder, 5% of silicon powder, 10% of aluminum powder, and 5% of lead powder.

[0062] Specific Example 3 is as follows:

[0063] In Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 A V-shaped composite solder strip for photovoltaic applications according to the present invention includes an alloy copper skin layer (1), an alloy aluminum shell layer (2), an alloy calcium powder layer (3), solder (11), a rectangular solder groove (12), and a diagonal V-shaped groove (13).

[0064] The alloy aluminum shell layer (2) is a rectangular shell filled with an alloy calcium powder layer (3) in the middle; the periphery of the alloy aluminum shell layer (2) is wrapped with an alloy copper skin layer (1); the alloy copper skin layer (1) has four sides with edges; the A side has a diagonal V-shaped groove (13); the B side has a rectangular solder groove (12); the solder (11) is welded to the alloy copper skin layer (1) on both sides in the middle of the B side; the left and right side surfaces of the alloy copper skin layer (1) are smooth surfaces parallel to each other.

[0065] Furthermore, the inner angle formed by the bottom line of the diagonal V-shaped groove (13) on the A side of the V-shaped composite solder strip for photovoltaic applications and the side of the V-shaped composite solder strip for photovoltaic applications is 60°.

[0066] Furthermore, the thickness of the alloy copper skin layer (1) is 1.5 mm.

[0067] Furthermore, the thickness of the alloy aluminum shell layer (2) is 2. mm.

[0068] Furthermore, the thickness of the alloy calcium powder layer (3) is 6 mm.

[0069] Furthermore, the inner angle of the V-shaped groove bottom angle of the diagonal V-shaped groove (13) on the A side of the V-shaped composite solder strip for photovoltaic applications is: 80°.

[0070] Furthermore, the groove width of the rectangular solder groove (12) on the B side of the V-shaped composite solder strip for photovoltaic applications is: 6 mm, and the groove depth is: 0.6 mm.

[0071] The material composition of the alloy copper skin layer (1) is: 90% pure copper, 2% phosphorus, 4.5% zinc, and 2.5% tin.

[0072] The material composition of the alloy aluminum shell layer (2) is: 88% aluminum, 6.5% zinc, and 5.5% lead.

[0073] The material composition of the alloy calcium powder layer (3) is: 85% calcium powder, 7% silicon powder, 4% aluminum powder, and 4% lead powder.

Claims

1. A V-shaped composite solder strip for photovoltaic use, comprising an alloy copper skin layer (1), an alloy aluminum shell layer (2), an alloy calcium powder layer (3), solder (11), a rectangular solder groove (12), and an inclined V-shaped groove (13), characterized in that: The alloy aluminum shell layer (2) is a rectangular shell, filled with an alloy calcium powder layer (3) in the middle; the outer periphery of the alloy aluminum shell layer (2) is wrapped with an alloy copper skin layer (1); the alloy copper skin layer (1) has four sides with edges; the A side has an inclined V-shaped groove (13); the B side has a rectangular solder groove (12); there is solder (11) in the middle of the B side to weld the alloy copper skin layers (1) on both sides; the left and right side surfaces of the alloy copper skin layer (1) are smooth surfaces parallel to each other.

2. The V-shaped composite solder ribbon for photovoltaic use according to claim 1, wherein: The angle ∠A formed by the intersection of the bottom line of the inclined V-shaped groove (13) on the A side of the V-shaped composite solder strip for photovoltaics and the side surface of the V-shaped composite solder strip for photovoltaics is 20° - 80°.

3. The V-shaped composite solder ribbon for photovoltaic use according to claim 1, characterized in that: The thickness of the alloy copper skin layer (1) is 0.3 - 2 mm.

4. A V-shaped composite solder strip for photovoltaic applications according to claim 1, characterized in that: The thickness of the alloy aluminum shell layer (2) is 0.3 - 2 mm.

5. The V-shaped composite solder strip for photovoltaics according to claim 1, wherein: The thickness of the alloy calcium powder layer (3) is 0.5 - 8 mm.

6. A V-shaped composite solder ribbon for photovoltaic applications according to claim 1, characterized in that: The inner angle of the V-shaped bottom angle of the inclined V-shaped groove (13) on the A side of the V-shaped composite solder strip for photovoltaics is: 30° - 90°.

7. The V-shaped composite solder strip for photovoltaic use according to claim 1, characterized in that: The groove width of the rectangular solder groove (12) on the B side of the V-shaped composite solder strip for photovoltaics is: 1.5 - 8.5 mm, and the groove depth is: 0.3 - 1.5 mm.

8. A V-shaped composite solder ribbon for photovoltaic use according to claim 1, characterized in that: The material composition of the alloy copper skin layer (1) is: 90 - 95% of red copper, 1.5 - 3% of phosphorus, 2 - 4.5% of zinc, 1.5 - 2.5% of tin.

9. A V-shaped composite solder strip for photovoltaic applications according to claim 1, characterized in that: The material composition of the alloy aluminum shell layer (2) is: 88 - 93% of aluminum, 4.5 - 6.5% of zinc, 2.5 - 5.5% of lead.

10. A V-shaped composite solder ribbon for photovoltaic applications according to claim 1, characterized in that: The material composition of the alloy calcium powder layer (3) is: 72 - 85% of calcium powder, 3.5 - 8% of silicon powder, 6.5 - 12% of aluminum powder, 2 - 5% of lead powder.

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