Production process of photovoltaic copper-aluminum composite belt and V-shaped copper-aluminum composite belt

Abstract

The invention discloses a photovoltaic copper-aluminum composite belt production process and a V-shaped copper-aluminum composite belt. The V-shaped copper-aluminum composite belt production process comprises the following steps of belt body forming and surface forming; the strip body forming process comprises the following steps: processing and forming the copper-aluminum composite wire into a copper-aluminum composite strip; and the surface forming process comprises the following steps: rolling the copper-aluminum composite belt obtained after the belt body forming process, and forming a V-shaped groove in the surface of the copper-aluminum composite belt. According to the V-shaped copper-aluminum composite belt, the copper-aluminum composite wire is adopted as a raw material, the V-shaped copper-aluminum composite belt is obtained through machining, the V-shaped copper-aluminum composite belt has the conductivity close to that of a copper material, the copper material is saved, the production cost of the composite belt can be reduced, and a large number of copper resources are saved; the surface of the V-shaped copper-aluminum composite belt is processed to form the V-shaped groove, the V-shaped groove can obliquely reflect sunlight, the sunlight can reach the surface of a photovoltaic component through secondary reflection, and the sunlight can be reused, so that the utilization rate of the sunlight is improved, the illumination intensity is improved, and the radiation loss is reduced.

Description

Technical Field

[0001] The present invention relates to a photovoltaic copper strip, and more specifically, to a production process of a photovoltaic copper-aluminum composite strip, and also to a V-shaped copper-aluminum composite strip produced by the production process. Background Art

[0002] Copper tape is an important component in photovoltaic modules and a key material for connecting solar cells. Solar cells are connected by copper tape to form a complete electrical path. Light energy is converted into electrical energy through solar cells, and the generated current forms a transmission circuit through copper tape, providing a path basis for utilizing solar energy. Copper tape plays the role of conductive link and heat dissipation channel in photovoltaic modules.

[0003] The cost of copper strip is relatively high, while the performance of copper-aluminum composite materials is close to that of copper materials, and can be used as a substitute for copper materials, which can greatly reduce the material cost. It is necessary to first shape the copper wire and aluminum wire into copper strips and aluminum strips of appropriate sizes, and then use the composite rolling method to composite the copper strips and aluminum strips to obtain copper-aluminum composite strips. The copper strips used for photovoltaics are relatively thin, and have high requirements for the bonding strength and performance of the copper strips and aluminum strips. The current technology cannot meet the requirements of photovoltaic copper strips.

[0004] In addition, in order to achieve welding between the copper strip and the solar cell, a tin layer is plated on the surface of the copper strip. After tinning, the surface of the copper strip is a plane that is approximately mirror-like. The light entering the component is incident on the surface and will be reflected by the mirror and cannot be used, which reduces the light intensity and causes the loss of sunlight.

[0005] Therefore, a new solution needs to be proposed to solve this problem. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a production process of a copper-aluminum composite strip for photovoltaics and a V-shaped copper-aluminum composite strip.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A production process of a copper-aluminum composite strip for photovoltaic use, comprising the following steps: strip body forming and surface forming, wherein the strip body forming step is to process a copper-aluminum composite wire into a copper-aluminum composite strip; and the surface forming step is to roll the copper-aluminum composite strip obtained after the strip body forming step to form a V-grooved surface on the surface of the copper-aluminum composite strip, wherein the V-grooved surface includes a plurality of V-grooves;

[0009] In the V-shaped surface forming, a V-shaped groove forming device is used to continuously roll and form the copper-aluminum composite strip twice. The V-shaped groove forming device includes a lower pressing roller, a V-shaped pressing roller and an upper pressing roller. The upper pressing roller and the lower pressing roller are arranged in parallel up and down. The V-shaped pressing roller is located between the upper pressing roller and the lower pressing roller, and the two ends of the V-shaped pressing roller are inclined up and down. A forming gap 1 that is wide on the left and narrow on the right is formed between the lower pressing roller and the V-shaped pressing roller, and a forming gap 2 that is narrow on the left and wide on the right is formed between the upper pressing roller and the V-shaped pressing roller. The copper-aluminum composite strip first passes through the forming gap 1 and then passes through the forming gap 2, and the V-shaped groove surface is rolled twice by the V-shaped die of the V-shaped pressing roller.

[0010] After the V-shaped surface is formed, the middle of the V-shaped groove surface bulges upward to form a high side portion, and the two side edges of the V-shaped groove surface form low side portions. The V-shaped groove surface gradually decreases from the middle high side portion to the two side low sides. The two side edges of the V-shaped groove are the groove edge high side and the groove edge low side, respectively, and there is a height difference between the groove edge high side and the groove edge low side.

[0011] The present invention is further configured such that the copper-aluminum composite wire comprises an intermediate aluminum layer and a copper layer coated on the periphery of the aluminum layer.

[0012] The present invention is further configured such that the strip forming process includes the following steps: drawing one, rolling one, drawing two, rolling two, rolling three, drawing three, rolling four, drawing four, online annealing one and drying one; the surface forming process includes the following steps: V-shaped surface forming, online annealing two and drying two.

[0013] The present invention is further configured that the first drawing step is: using a copper-aluminum composite wire with a diameter of 3 mm to 8 mm as a raw material, drawing it to 1.2 mm to 2.9 mm, and the drawing speed is 125 m / min to 130 m / min;

[0014] The first rolling step is: rolling the copper-aluminum composite wire after the first drawing step to obtain a copper-aluminum composite strip, with a reduction amount of 0.35 mm to 0.55 mm;

[0015] The second drawing step is: drawing the copper-aluminum composite strip after the rolling in step one, the drawing amount of the width is 0.06mm-0.08mm, and the drawing amount of the thickness is 0.015mm-0.045mm;

[0016] The second rolling step is: rolling the copper-aluminum composite strip after the second drawing step, with a reduction amount of 0.06 mm to 0.2 mm;

[0017] The third rolling step is: rolling the copper-aluminum composite strip after the second rolling step, with a reduction amount of 0.06 mm to 0.2 mm;

[0018] The third drawing step is: drawing the copper-aluminum composite strip after the third rolling step, the drawing amount of the width is 0.06mm-0.08mm, and the drawing amount of the thickness is 0.015mm-0.045mm;

[0019] The fourth rolling step is: rolling the copper-aluminum composite strip after the drawing step three, with a reduction amount of 0.06 mm to 0.2 mm;

[0020] The fourth drawing step is: drawing the copper-aluminum composite strip after the fourth rolling step, the drawing amount of the width is 0.06mm-0.08mm, and the drawing amount of the thickness is 0.06mm-0.08mm.

[0021] The present invention is further configured as follows: step one of online annealing includes one of conductive heating and one of water annealing, the voltage of the conductive heating is 15-17V, the current is 500A-700A, the time of the conductive heating is 0.6-1.2 seconds, and the temperature of the copper strip after the conductive heating is 750-800 degrees; the time of the water annealing is 0.3-0.6 seconds, and the temperature after exiting the water is ≤50 degrees; during the process of step one of online annealing, nitrogen protection is adopted.

[0022] The present invention is further configured as follows: step 2 of online annealing includes conductive heating 2 and water annealing 2, the voltage of conductive heating 2 is 12-15V, the current is 300-450A, the time of conductive heating is 0.5-1.5 seconds, and the temperature of the V-shaped copper-aluminum composite strip after conductive heating is 350-450 degrees; nitrogen protection is used during step 2 of online annealing.

[0023] The present invention is further configured such that after the V-shaped surface is formed, the height h of the V-shaped groove is 0.020mm-0.040mm, and the angle A of the V-shaped groove is 90°-120°; the outer peripheral surface of the V-shaped pressing roller is also inclined relative to the surface of the copper-aluminum composite strip.

[0024] The present invention is further configured such that the high side of the groove edge is close to the high side portion of the V-shaped groove surface, and the low side of the groove edge is close to the low side portion.

[0025] The present invention is further configured as follows: the V-shaped pressure roller includes a support shaft, a cylindrical roller body and a bearing assembly, the support shaft is located between the lower pressure roller and the V-shaped pressure roller, the cylindrical roller body is sleeved on the outer periphery of the support shaft, the cylindrical roller body and the support shaft are supported by the bearing assembly, the cylindrical roller body can rotate relative to the support shaft, and the axial ends of the cylindrical roller body can be adjusted up and down; the V-shaped mold part is arranged on the outer periphery of the cylindrical roller body, and is rolled by the cylindrical roller body and the copper-aluminum composite strip.

[0026] The present invention also provides a V-shaped copper-aluminum composite belt, which adopts the production process of the copper-aluminum composite belt for photovoltaic use as mentioned above to process the copper-aluminum composite wire to obtain a V-shaped copper-aluminum composite belt with a V-shaped groove surface, which is suitable for use in the photovoltaic field.

[0027] In summary, the present invention has the following beneficial effects:

[0028] In this scheme, copper-aluminum composite wire is used as raw material to obtain a V-shaped copper-aluminum composite belt. The V-shaped copper-aluminum composite belt has a conductive property close to that of copper material and saves copper material, can reduce the production cost of the composite belt, and save a large amount of copper resources; V-shaped grooves are formed on the surface of the V-shaped copper-aluminum composite belt, and the V-shaped grooves can obliquely reflect sunlight, and through secondary reflection, the sunlight can reach the surface of the photovoltaic component, and the sunlight can be reused, thereby improving the utilization rate of sunlight, increasing the light intensity, and reducing the radiation loss.

[0029] By adopting copper-clad aluminum copper-aluminum composite wire, after forming processing, the outer surface of the V-shaped copper-aluminum composite strip still has the color and luster of copper, and the appearance is consistent with the strip body of pure copper material, so that its overall performance is basically close to that of pure copper strip; moreover, since the raw material is copper-clad aluminum composite wire, during the processing, there is no need to perform composite processing on copper and aluminum materials, the composite processing step can be omitted, and the combination of copper and aluminum materials is more uniform and stable.

[0030] In the V-shaped surface forming step, the V-shaped roller can roll the surface of the copper-aluminum composite strip obliquely, and the V-shaped groove surface formed is slightly inclined; along the width direction of the strip body, the V-shaped groove surface has a low side and a high side. Corresponding to the V-shaped groove of the V-shaped groove surface, the V-shaped groove also has a high side of the groove edge and a low side of the groove edge. The high side of the groove edge and the low side of the groove edge correspond to the inclined trend of the V-shaped groove surface. There is a certain drop in the height direction between the high side of the groove edge and the low side of the groove edge. Due to the drop of the edges on both sides of the V-shaped groove, after the light is irradiated into the V-shaped groove, more of the light can be reflected away from the low side of the groove edge, thereby being able to shape and select the light to a certain extent.

[0031] By setting the trend of the V-groove surface to an inclined state, the inclined state can be superimposed on the inclination angle of the V-groove itself, thereby enhancing the reflection effect of the V-groove surface in the side direction, thereby supplementing and improving the utilization efficiency of the secondary reflection.

[0032] Corresponding to the V-groove of the V-groove surface, the V-groove also has a high side and a low side of the groove edge, and the high side and the low side of the groove edge correspond to the inclined trend of the V-groove surface. There is a certain drop s in the height direction between the high side and the low side of the groove edge. Due to the drop of the edges on both sides of the V-groove, after the light is irradiated into the V-groove, more of the light can be reflected away from the low side of the groove edge, thereby being able to shape and select the light to a certain extent.

[0033] The V-groove forming device has a lower pressure roller, a V-shaped pressure roller and an upper pressure roller. The same V-shaped pressure roller is used to keep the inclination of both sides of the V-groove surface basically consistent. The inclination directions during the two rolling processes are opposite, which can more accurately and stably control the inclination angles during the rolling process on both sides. Moreover, by adjusting the inclination and swing angle of the cylindrical roller body, the inclination trend of the V-groove surface can be adjusted, and specific adjustments can be made according to the required thickness of the V-shaped copper-aluminum composite strip, which can improve the applicability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a flow chart of a production process of a copper-aluminum composite strip for photovoltaic use in Example 1;

[0035] Figure 2 This is a schematic diagram of the structure of the copper-aluminum composite wire in Example 1;

[0036] Figure 3 This is a schematic diagram of the structure of the copper-aluminum composite strip in Example 1;

[0037] Figure 4 Schematic diagram of the V-shaped surface forming step in Example 1;

[0038] Figure 5 This is a schematic diagram of the structure of the V-shaped copper-aluminum composite strip in Example 1;

[0039] Figure 6 This is a schematic diagram of the structure of the V-shaped copper-aluminum composite strip in Example 2;

[0040] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0041] Figure 8 Schematic diagram of the V-shaped surface forming step in Example 2 Figure 1 ;

[0042] Fig. 9 Schematic diagram of the V-shaped surface forming step in Example 2 Figure 2 ;

[0043] Fig.10 The structure of the V-groove forming device in the second embodiment is shown in FIG. Figure 1 ;

[0044] Fig.11 The structure of the V-groove forming device in the second embodiment is shown in FIG. Figure 2 ;

[0045] Fig.12 It is a structural schematic diagram of the V-groove forming device in Example 3;

[0046] Fig.13is a cross-sectional view of the V-shaped pressure roller in Example 3;

[0047] Fig.14 Schematic diagram of the structure of the skewness adjustment component in Example 3.

[0048] Figure numerals: copper-aluminum composite wire 10; aluminum layer 11; copper layer 12; copper-aluminum composite strip 20; V-shaped copper-aluminum composite strip 30; V-shaped groove surface 31; V-shaped groove 310; groove edge high side 311; groove edge low side 312; low side portion 32; high side portion 33; lower pressure roller 4; forming gap one 40; V-shaped pressure roller 5; V-shaped mold portion 50; support shaft 51; cylindrical roller body 52; bearing assembly 53; inner ring 531; outer ring 532; spherical portion 533; roller 534; upper pressure roller 6; forming gap two 60; tilting drive frame 7; guide wheel 71; lifting drive 72. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Embodiment 1

[0051] This embodiment discloses a production process of a photovoltaic copper-aluminum composite strip. Figure 1-Figure 5 As shown, the photovoltaic copper-aluminum composite strip 20 is processed, using the copper-aluminum composite wire 10 as the raw material, the copper-aluminum composite wire 10 has an aluminum layer 11 in the middle and is coated with a copper layer 12 on the periphery, and the copper-aluminum composite wire 10 can be processed into the copper-aluminum composite strip 20 through multiple processing steps. In addition, the surface of the copper-aluminum composite strip 20 is further rolled, and a structure with a V-shaped groove 310 is formed on the surface of the copper-aluminum composite strip 20 to form a V-shaped copper-aluminum composite strip 30.

[0052] Reference Figure 1 As shown, the production process of copper-aluminum composite strip for photovoltaic use is divided into two major processes. The first process is strip body forming, in which the copper-aluminum composite wire 10 is processed into a copper-aluminum composite strip 20; the second process is surface forming, in which the copper-aluminum composite strip 20 with a smooth surface is processed into a V-shaped copper-aluminum composite strip 30 with a V-shaped groove 310.

[0053] The production process specifically includes the following steps: drawing one, rolling one, drawing two, rolling two, rolling three, drawing three, rolling four, drawing four, online annealing one, drying one, V-shaped surface forming, online annealing two, drying two and winding, which can process the copper-aluminum composite wire into a copper-aluminum composite strip, and form a V-shaped groove surface on the surface of the copper-aluminum composite strip. Among them, drawing one, rolling one, drawing two, rolling two, rolling three, drawing three, rolling four, drawing four, online annealing one, and drying one are the first step of strip body forming process; V-shaped surface forming, online annealing two, drying two and winding are the second step of surface forming process.

[0054] The first drawing step is: using a copper-aluminum composite wire with a diameter of 3 mm to 8 mm as a raw material, drawing it to 1.2 mm to 2.9 mm, and the drawing speed is 125 m / min to 130 m / min; the copper-aluminum composite wire 10 is a copper-clad aluminum composite wire, wherein the mass of the copper material is at least 20% of the total mass of the copper-aluminum composite wire;

[0055] The first rolling step is: rolling the copper-aluminum composite wire after the first drawing step to obtain a copper-aluminum composite strip, and the reduction amount of the first rolling step is 0.35 mm to 0.55 mm;

[0056] The second drawing step is: drawing the copper-aluminum composite strip after the rolling in the first step. In the second drawing step, the drawing amount of the copper-aluminum composite strip width is 0.06 mm to 0.08 mm, and the drawing amount of the copper-aluminum composite strip thickness is 0.015 mm to 0.045 mm;

[0057] The second rolling step is: rolling the copper-aluminum composite strip after the drawing step, wherein the reduction amount of the rolling in the second rolling step is 0.06 mm to 0.2 mm;

[0058] The third rolling step is: rolling the copper-aluminum composite strip after the second rolling step, wherein the rolling reduction in the third rolling step is 0.06 mm to 0.2 mm;

[0059] In step 2 and step 3, the copper-aluminum composite strip is rolled on both sides successively, and the two rolling processes compensate each other, disperse the single rolling amount, and avoid cracking and damage on the strip surface;

[0060] The third drawing step is: drawing the copper-aluminum composite strip after the third rolling step. In the third drawing step, the drawing amount of the copper-aluminum composite strip width is 0.06 mm to 0.08 mm, and the drawing amount of the copper-aluminum composite strip thickness is 0.015 mm to 0.045 mm;

[0061] The fourth rolling step is: rolling the copper-aluminum composite strip after the drawing step three, wherein the rolling reduction amount in the fourth rolling step is 0.06 mm to 0.2 mm;

[0062] The fourth drawing step is: drawing the copper-aluminum composite strip after the fourth rolling step. In the fourth drawing step, the drawing amount of the copper-aluminum composite strip width is 0.06 mm to 0.08 mm, and the drawing amount of the copper-aluminum composite strip thickness is 0.06 mm to 0.08 mm.

[0063] The step of online annealing 1 includes conductive heating 1 and water annealing 1; the specific steps are: firstly, the copper-aluminum composite strip after drawing 4 is conductively heated, and then annealed in water. Among them, the voltage of conductive heating 1 is 15-17V, the current is 500A-700A, the time of conductive heating is 0.6-1.2 seconds, and the temperature of the copper strip after conductive heating is 750-800 degrees; the time of water annealing 1 is 0.3-0.6 seconds, and the temperature of the copper-aluminum composite strip after leaving the water is ≤50 degrees. In the process of online annealing 1, nitrogen protection measures are adopted to prevent oxidation of the surface of the copper-aluminum composite strip.

[0064] The first step of drying is to dry the copper-aluminum composite strip after the online annealing in the first step, the drying temperature is 75 to 80 degrees, and the drying time is 3 to 5 seconds.

[0065] The V-shaped surface is formed by rolling the copper-aluminum composite strip after drying in step 1 with a V-shaped roller, and a surface with a V-shaped groove is formed on one side of the copper-aluminum composite strip to obtain a V-shaped copper-aluminum composite strip. After forming, the height h of the V-shaped groove 310 is 0.020mm-0.040mm, and the angle A of the V-shaped groove 310 is 90°-120°. For example, the parameters of the V-shaped groove 310 can be selected, the height h is 0.037mm±0.002mm, and the angle A is 117°±2°.

[0066] Reference Figure 4 As shown, in the step of V-shaped surface forming, a V-shaped groove forming device is used to roll the surface of the copper-aluminum composite strip. The V-shaped groove forming device includes a lower pressing roller 4 and a V-shaped pressing roller 5, and the V-shaped pressing roller 5 is located on the upper side of the lower pressing roller 4, and a forming gap 40 is formed between the two for the copper-aluminum composite strip 20 to pass through.

[0067] A V-shaped die portion 50 is formed on the outer periphery of the V-shaped pressing roller 5 , and a V-shaped groove surface 31 can be formed on the corresponding side surface of the copper-aluminum composite strip 20 during the rolling process.

[0068] The second step of online annealing includes conductive heating second and water annealing second; the specific steps are: firstly, conductive heating is performed on the V-shaped copper-aluminum composite strip after the V-shaped surface is formed in step 2, and then water annealing is performed. Among them, the voltage of conductive heating second is 12-15V, the current is 300-450A, the time of conductive heating is 0.5-1.5 seconds, and the temperature of the V-shaped copper-aluminum composite strip after conductive heating is 350-450 degrees; the time of water annealing second is 0.3-0.6 seconds, and the temperature of the V-shaped copper-aluminum composite strip after exiting the water is ≤50 degrees. In the process of online annealing second, nitrogen protection measures are adopted to prevent oxidation of the surface of the copper-aluminum composite strip.

[0069] After the above processing, the copper material and the aluminum material in the V-shaped copper-aluminum composite strip are further combined to form a diffusion layer, and the thickness of the diffusion layer is less than 3 μm.

[0070] The second step of drying is to dry the V-shaped copper-aluminum composite strip after online annealing, the drying temperature is 80 to 90 degrees, and the drying time is 1 to 2 seconds.

[0071] The winding step is to wind up the V-shaped copper-aluminum composite strip after drying in step 2, and the winding force is 35N to 55N.

[0072] The V-shaped copper-aluminum composite strip in this embodiment is Figure 5 As shown, through the production process of this embodiment, the copper-aluminum composite wire is processed to manufacture a V-shaped copper-aluminum composite belt. One side of the V-shaped copper-aluminum composite belt is a V-shaped groove surface 31, and the V-shaped groove surface 31 is formed with V-shaped grooves 310, and the V-shaped grooves 310 are distributed along the length direction of the composite belt, and each V-shaped groove 310 is distributed side by side along the width direction of the composite belt.

[0073] The tensile strength of the V-shaped copper-aluminum composite strip 30 is approximately 110 MPa, the elongation is approximately 30%, and the conductivity is approximately 75% IACS. The V-shaped copper-aluminum composite strip 30 in this embodiment is suitable for photovoltaic use, has performance comparable to that of copper materials, and saves copper resources.

[0074] By forming a V-shaped groove 310 on the surface of the copper-aluminum composite strip, the surface of the V-shaped groove 310 can reflect sunlight obliquely and can reflect it in the lateral direction of the copper-aluminum composite strip. Through secondary reflection, the sunlight can reach the surface of the photovoltaic component, and the sunlight can be reused, thereby improving the utilization rate of sunlight, increasing the light intensity, and reducing the radiation loss.

[0075] Embodiment 2

[0076] This embodiment discloses a production process of a photovoltaic copper-aluminum composite strip. Figure 8-Figure 11 A detailed explanation is given and the steps of V-shaped surface forming are further designed.

[0077] In the photovoltaic module, the components for converting light energy are distributed on both sides of the V-shaped copper-aluminum composite belt. If the sunlight directly shines on the surface of the V-shaped copper-aluminum composite belt, this part of the sunlight cannot be directly utilized. The V-shaped groove 310 can reflect the light obliquely, and part of the sunlight is reflected to both sides. Then, after being reflected by the surface material of the photovoltaic panel, part of the light can be reflected to the surface of the components for converting light energy, thereby improving the utilization efficiency of part of the light energy.

[0078] Further, refer to Figure 6 As shown, the V-shaped groove surface 31 of the V-shaped copper-aluminum composite belt 30 can be set in an inclined state. Along the width direction of the belt body, the V-shaped groove surface 31 has a low side portion 32 and a high side portion 33. The overall trend of the V-shaped groove surface 31 is to decrease from the high side portion 33 to the low side portion 32.

[0079] Corresponding to the V-shaped groove 310 of the V-shaped groove surface 31, the V-shaped groove 310 also has a groove edge high side 311 and a groove edge low side 312, and the groove edge high side 311 and the groove edge low side 312 correspond to the inclined trend of the V-shaped groove surface 31. There is a certain drop s between the groove edge high side 311 and the groove edge low side 312 in the height direction. Due to the drop of the edges on both sides of the V-shaped groove 310, after the light is irradiated into the V-shaped groove 310, more of the light can be reflected away from the groove edge low side 312, thereby being able to shape and select the light to a certain extent.

[0080] Reference Figure 6 As shown, in the cross-sectional direction of the V-shaped copper-aluminum composite strip 30, the middle of the V-shaped groove surface 31 bulges upward to form a high side portion 33, and the two side edges of the V-shaped groove surface 31 form a low side portion 32. The V-shaped groove surface 31 can form a structure that bulges in the middle and lowers toward the two side edges.

[0081] Furthermore, in order to realize the processing of the V-groove surface 31 with an inclined trend, the V-groove forming device is further designed, referring to Figure 8 , Fig. 9 As shown, in the V-groove forming device, the V-shaped pressing roller 5 is inclined relative to the lower pressing roller 4, so that the forming gap 40 formed between the V-shaped pressing roller 5 and the lower pressing roller 4 also has an inclined trend, and a V-shaped groove surface 31 with an inclined trend can be formed by processing.

[0082] During the forming process, the copper-aluminum composite strip 20 can be rolled and formed twice continuously, and during the rolling and forming process on both sides, the inclination direction of the V-shaped pressing roller 5 relative to the copper-aluminum composite strip 20 is opposite, referring to Figure 8 , Fig. 9 shown.

[0083] Reference Figure 8As shown, during this rolling process, the height of the left side of the V-shaped roller 5 is lower, and the left upper surface of the copper-aluminum composite strip 20 is rolled. Fig. 9 As shown, during this rolling process, the height of the right side of the V-shaped roller 5 is lower, and the right upper surface of the copper-aluminum composite strip 20 is rolled. By rolling the V-shaped groove surface 31 on both sides, different trends can be formed on both sides of the V-shaped groove surface 31, forming a state in which the middle is raised and inclined downward toward both sides.

[0084] Furthermore, in order to adapt to the two-roll forming process of the V-groove surface 31, the V-groove forming device can be further configured.

[0085] Reference Fig.10 , Fig.11 As shown, the V-groove forming device includes a lower pressing roller 4, a V-shaped pressing roller 5 and an upper pressing roller 6. The lower pressing roller 4, the V-shaped pressing roller 5 and the upper pressing roller 6 are arranged from top to bottom, and the lower pressing roller 4 and the upper pressing roller 6 are parallel to each other, and the two ends of the middle V-shaped pressing roller 5 are inclined up and down. A forming gap 40, which is wide on the left and narrow on the right, is formed between the lower pressing roller 4 and the V-shaped pressing roller 5, and a forming gap 60, which is narrow on the left and wide on the right, is formed between the upper pressing roller 6 and the V-shaped pressing roller 5.

[0086] In the step of V-shaped surface forming, the copper-aluminum composite strip 20 first passes through the forming gap 1 40, and then passes through the forming gap 2 60, and the V-shaped groove surface 31 is rolled by the V-shaped die portion 50 of the same V-shaped pressing roller 5, so that the groove shape of the V-shaped groove 310 formed on the surface of the V-shaped groove surface 31 can be kept basically consistent. In addition, since the same V-shaped pressing roller 5 is used, the inclination of both sides of the V-shaped groove surface 31 can also be kept basically consistent.

[0087] Moreover, the middle position of the V-shaped pressing roller 5 can also correspond to the middle position of the copper-aluminum composite strip 20, so that during the rolling forming process, it can be ensured that the V-shaped pressing roller 5 can roll the two sides of the V-shaped groove surface 31 respectively, forming an inclined direction with a higher middle and slightly lower two sides.

[0088] By adopting the production process in this embodiment, a V-shaped copper-aluminum composite strip 30 can be obtained. Figure 6 As shown, it is suitable for use in photovoltaic modules.

[0089] Embodiment 3

[0090] This embodiment discloses a production process of a photovoltaic copper-aluminum composite strip. Figure 12-14 A detailed description is given of the V-groove forming device used in the step of V-shaped surface forming, and the V-groove forming step will also be adaptively adjusted accordingly.

[0091] Reference Fig.12As shown, the V-shaped pressing roller 5 comprises a support shaft 51, a cylindrical roller body 52 and a bearing assembly 53. The support shaft 51 is located between the lower pressing roller 4 and the V-shaped pressing roller 5, and is parallel to and equidistant from the axes of the lower pressing roller 4 and the V-shaped pressing roller 5. The cylindrical roller body 52 is sleeved on the outer periphery of the support shaft 51, can rotate relative to the support shaft 51, and can produce radial deflection. The V-shaped die 50 is arranged on the outer periphery of the cylindrical roller body 52, and the cylindrical roller body 52 is directly rolled with the copper-aluminum composite strip 20.

[0092] The support shaft 51 and the cylindrical roller body 52 are rotatably connected through a bearing assembly 53, and the bearing assembly 53 is installed in the middle position of the support shaft 51 and the cylindrical roller body 52. ​​The bearing assembly 53 includes an inner ring 531, an outer ring 532 and a plurality of rollers 534. The inner ring 531 is coaxially sleeved and fixedly installed on the outer periphery of the support shaft 51, and the outer ring 532 is coaxially fixedly installed in the cylindrical roller body 52. ​​A spherical portion 533 is formed on the inner periphery of the outer ring 532. The spherical portion 533 and the inner ring 531 are rollingly supported by a plurality of rollers 534, so that the outer ring 532 and the inner ring 531 can rotate stably, and the up and down swing of the two ends of the cylindrical roller body 52 can be realized.

[0093] The bearing assembly 53 is a self-aligning bearing structure, which can allow the cylindrical roller body 52 and the support shaft 51 to swing at a certain angle, and in the swing state, the cylindrical roller body 52 can still rotate smoothly.

[0094] In the bearing assembly 53, two outer rings 532 are provided, and are respectively mounted on the axial ends of the inner ring 531. The spherical portions 533 on the inner circumferences of the two outer rings 532 are symmetrically distributed, and ensure that the spherical portions 533 on the inner circumferences of the two outer rings 532 are concentric structures, and the center position of the spherical portion 533 is concentric with the axis of the support shaft 51.

[0095] During the V-shaped surface forming process, the center position of the copper-aluminum composite strip 20 is kept opposite to the center position of the cylindrical roller 52; the center position of the spherical portion 533 of the bearing assembly 53 (i.e., the yaw center of the bearing assembly 53) is roughly kept opposite to the center position of the copper-aluminum composite strip 20. During the process of adjusting the up and down tilt of both ends of the cylindrical roller 52, the positions of the copper-aluminum composite strip 20 corresponding to the forming gap 1 40 and the forming gap 2 60 can be kept symmetrical. For example, the right side of the cylindrical roller body 52 deflects downward, and correspondingly, the left side of the cylindrical roller body 52 deflects upward; in the forming gap 1 40, the lower part of the cylindrical roller body 52 can roll the upper side surface of the copper-aluminum composite strip 20, and mainly roll-form the V-shaped groove surface 31 on the right side of the copper-aluminum composite strip 20; when the copper-aluminum composite strip 20 is conveyed and transferred to the forming gap 2 60, the upper part of the cylindrical roller body 52 can roll-form the V-shaped groove surface 31 on the left side of the copper-aluminum composite strip 20, and can roll-form both sides of the same side of the copper-aluminum composite strip 20 to form a V-shaped groove surface 31 with a middle bulge and inclined downward on both sides.

[0096] Reference Fig.14 As shown, the outer periphery of both ends of the cylindrical roller body 52 is installed with a deflection adjustment assembly, which can adjust and limit the two ends of the cylindrical roller body 52, and can step the V-shaped surface forming process, keep the position of the cylindrical roller body 52 in a deflection position with a stable angle, and ensure that the surface shape of the belt bodies formed in the same batch can remain consistent.

[0097] The deflection adjustment assembly at each end of the cylindrical roller body 52 is divided into two parts, upper and lower, and the two parts are roughly symmetrical, including an arc-shaped tilting drive frame 7, on which two guide wheels 71 are installed, and the two guide wheels 71 are respectively pressed against the outer periphery of the cylindrical roller body 52 and rolled and adapted; and the two guide wheels are respectively located on both sides of the cylindrical roller body 52, which can prevent the cylindrical roller body 52 from having a horizontal deflection. In addition, the tilting drive frame 7 is installed on the lifting drive 72, and the lifting drive 72 can drive the tilting drive frame 7 to rise and fall. By adjusting the height of the tilting drive frame 7, the end deflection amplitude of the cylindrical roller body 52 can be adjusted.

[0098] At each end of the cylindrical roller body 52, there are four guide wheels 71 for limiting, which can maintain the position stability of the cylindrical roller body 52, and by rolling against each other, they can not only play a supporting role, but also maintain the smooth rotation of the cylindrical roller body 52, and thus can stably adapt to the up and down swing adjustment state of the cylindrical roller body 52.

[0099] In this embodiment, by adjusting the tilting and swinging angle of the cylindrical roller body 52, the tilting trend of the V-shaped groove surface 31 can be adjusted, and specific adjustments can be made according to the required thickness of the V-shaped copper-aluminum composite belt 30, which can improve the applicability of the equipment.

[0100] Moreover, in this embodiment, the height positions of the lower pressing roller 4 and the upper pressing roller 6 can be adjusted. By adjusting the heights of the lower pressing roller 4 and the upper pressing roller 6 respectively, the heights of the forming gap 1 40 and the forming gap 2 60 can be adjusted to adapt to the different thicknesses of the copper-aluminum composite strip 20, and the adaptability of the equipment can also be improved to a certain extent.

[0101] The present embodiment further discloses a V-shaped copper-aluminum composite strip, which is produced by adopting the production process in the present embodiment, and in particular, the step of V-shaped groove forming is carried out by adopting the V-shaped groove forming device in the present embodiment.

[0102] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A production process of copper-aluminum composite strip for photovoltaic use, characterized in that: The method comprises the following steps: strip body forming and surface forming, wherein the strip body forming step is to process the copper-aluminum composite wire (10) into a copper-aluminum composite strip (20); the surface forming step is to roll the copper-aluminum composite strip (20) obtained after the strip body forming step, and form a V-shaped groove surface (31) on the surface of the copper-aluminum composite strip (20), wherein the V-shaped groove surface (31) comprises a plurality of V-shaped grooves (310); In the V-shaped surface forming, a V-shaped groove forming device is used to roll and form the copper-aluminum composite strip (20) twice continuously. The V-shaped groove forming device comprises a lower pressing roller (4), a V-shaped pressing roller (5) and an upper pressing roller (6). The upper pressing roller (6) and the lower pressing roller (4) are arranged in parallel in an upper and lower direction. The V-shaped pressing roller (5) is located between the upper pressing roller (6) and the lower pressing roller (4), and the two ends of the V-shaped pressing roller (5) are inclined up and down. A forming gap 1 (40) which is wide on the left and narrow on the right is formed between the lower pressing roller (4) and the V-shaped pressing roller (5), and a forming gap 2 (60) which is narrow on the left and wide on the right is formed between the upper pressing roller (6) and the V-shaped pressing roller (5). The copper-aluminum composite strip (20) first passes through the forming gap 1 (40) and then passes through the forming gap 2 (60). The V-shaped die portion (50) of the V-shaped pressing roller (5) rolls the V-shaped groove surface (31) twice. After the V-shaped surface is formed, the middle of the V-shaped groove surface (31) bulges upward to form a high side portion (33), and the two side edges of the V-shaped groove surface (31) form low side portions (32). The V-shaped groove surface (31) gradually decreases from the middle high side portion (33) to the two side low side portions (32). The two side edges of the V-shaped groove (310) are respectively a groove edge high side (311) and a groove edge low side (312), and there is a height difference between the groove edge high side (311) and the groove edge low side (312).

2. The production process of the photovoltaic copper-aluminum composite strip according to claim 1, characterized in that: The copper-aluminum composite wire (10) comprises a middle aluminum layer (11) and a copper layer (12) coated on the periphery of the aluminum layer (11).

3. The production process of the photovoltaic copper-aluminum composite strip according to claim 1, characterized in that: The strip forming process includes the following steps: drawing one, rolling one, drawing two, rolling two, rolling three, drawing three, rolling four, drawing four, online annealing one and drying one; the surface forming process includes the following steps: V-shaped surface forming, online annealing two and drying two.

4. The production process of the photovoltaic copper-aluminum composite strip according to claim 3, characterized in that: The first drawing step is: using a copper-aluminum composite wire (10) with a diameter of 3 mm to 8 mm as a raw material, drawing it to 1.2 mm to 2.9 mm, and drawing at a speed of 125 m / min to 130 m / min; The first rolling step comprises: rolling the copper-aluminum composite wire (10) after the first drawing step to obtain a copper-aluminum composite strip (20), with a reduction amount of 0.35 mm to 0.55 mm; The second drawing step comprises: drawing the copper-aluminum composite strip (20) after the rolling in the first step, wherein the drawing amount of the width is 0.06 mm to 0.08 mm, and the drawing amount of the thickness is 0.015 mm to 0.045 mm; The second rolling step comprises: rolling the copper-aluminum composite strip (20) after the drawing step 2, with a reduction amount of 0.06 mm to 0.2 mm; The third rolling step is: rolling the copper-aluminum composite strip (20) after the second rolling step, with a reduction amount of 0.06 mm to 0.2 mm; The third drawing step comprises: drawing the copper-aluminum composite strip (20) after the third rolling step, wherein the drawing amount of the width is 0.06 mm to 0.08 mm, and the drawing amount of the thickness is 0.015 mm to 0.045 mm; The fourth rolling step is: rolling the copper-aluminum composite strip (20) after the drawing step (3) with a reduction amount of 0.06 mm to 0.2 mm; The fourth drawing step is: drawing the copper-aluminum composite strip (20) after the fourth rolling step, wherein the drawing amount of the width is 0.06 mm to 0.08 mm, and the drawing amount of the thickness is 0.06 mm to 0.08 mm.

5. The production process of the photovoltaic copper-aluminum composite strip according to claim 3, characterized in that: The step of online annealing one includes conductive heating one and water annealing one. The voltage of conductive heating one is 15-17V, the current is 500A-700A, the time of conductive heating is 0.6-1.2 seconds, and the temperature of the copper strip after conductive heating is 750-800 degrees; the time of water annealing one is 0.3-0.6 seconds, and the temperature after exiting the water is ≤50 degrees; during the process of online annealing one, nitrogen protection is adopted.

6. The production process of the photovoltaic copper-aluminum composite strip according to claim 3, characterized in that: The second step of online annealing includes conductive heating second and water annealing second. The voltage of conductive heating second is 12-15V, the current is 300-450A, the time of conductive heating is 0.5-1.5 seconds, and the temperature of the V-shaped copper-aluminum composite strip after conductive heating is 350-450 degrees. Nitrogen protection is used during the second step of online annealing.

7. The production process of the photovoltaic copper-aluminum composite strip according to claim 1, characterized in that: After the V-shaped surface is formed, the height h of the V-shaped groove (310) is 0.020 mm-0.040 mm, and the angle A of the V-shaped groove (310) is 90°-120°; the outer peripheral surface of the V-shaped pressing roller (5) is also inclined relative to the surface of the copper-aluminum composite strip (20).

8. The production process of the photovoltaic copper-aluminum composite strip according to claim 1, characterized in that: The groove edge high side (311) is close to the high side portion (33) of the V-shaped groove surface (31), and the groove edge low side (312) is close to the low side portion (32).

9. The production process of the photovoltaic copper-aluminum composite strip according to claim 1, characterized in that: The V-shaped pressing roller (5) comprises a support shaft (51), a cylindrical roller body (52) and a bearing assembly (53); the support shaft (51) is located between the lower pressing roller (4) and the V-shaped pressing roller (5); the cylindrical roller body (52) is sleeved on the outer periphery of the support shaft (51); the cylindrical roller body (52) and the support shaft (51) are supported by the bearing assembly (53); the cylindrical roller body (52) can rotate relative to the support shaft (51), and the axial ends of the cylindrical roller body (52) can be adjusted to swing up and down; the V-shaped die part (50) is arranged on the outer periphery of the cylindrical roller body (52), and is rolled by the cylindrical roller body (52) and the copper-aluminum composite strip (20).

10. A V-shaped copper-aluminum composite strip, characterized in that: The copper-aluminum composite wire (10) is processed using the production process of the photovoltaic copper-aluminum composite strip as described in any one of claims 1 to 9 to obtain a V-shaped copper-aluminum composite strip (30) having a V-shaped groove surface (31) on the surface.

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