Production process of copper-aluminum composite strip for photovoltaic use and V-shaped copper-aluminum composite strip

Abstract

The present invention discloses a production process of a copper-aluminum composite strip for photovoltaic use and a V-shaped copper-aluminum composite strip, including the following processes: strip body forming and surface forming; the process of strip body forming is to process a copper-aluminum composite wire into a copper-aluminum composite strip; the process of surface forming is to perform rolling processing on the copper-aluminum composite strip obtained after the strip body forming process to form V-shaped grooves on the surface of the copper-aluminum composite strip. The present invention uses a copper-aluminum composite wire as the raw material to process a V-shaped copper-aluminum composite strip. The V-shaped copper-aluminum composite strip has a conductivity close to that of copper material, saves copper material, can reduce the production cost of the composite strip, and saves a large amount of copper resources; V-shaped grooves are formed on the surface of the V-shaped copper-aluminum composite strip. The V-shaped grooves can perform inclined reflection on sunlight, and through secondary reflection, it can reach the surface of photovoltaic components, and the sunlight can be reused, thereby improving the utilization rate of sunlight, increasing the light intensity, and reducing the loss of irradiation amount.

Description

Technical Field

[0001] The present invention relates to copper strips for photovoltaic applications, and more specifically, to a production process for copper-aluminum composite strips for photovoltaic use, and also to a V-shaped copper-aluminum composite strip obtained by using this production process. Background Art

[0002] Copper strips are important components in photovoltaic modules and are key materials for connecting solar cells. Solar cells are connected through copper strips to form a complete electrical path. The light energy is converted into electrical energy through the solar cells, and the generated current forms a transmission circuit through the copper strips, providing a path basis for the utilization of solar energy. Copper strips play the roles of conductive connection and heat dissipation channels in photovoltaic modules.

[0003] The cost of copper strips 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. First, copper wires and aluminum wires need to be formed and processed to form copper strips and aluminum strips of appropriate sizes, and then, by using the method of composite rolling, the copper strips and aluminum strips are compounded with each other, and thus a copper-aluminum composite strip can be obtained. The copper strips for photovoltaic use are relatively thin, and there are relatively 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 the welding between the copper strip and the solar cell, a tin layer is plated on the surface of the copper strip. After plating with tin, the surface of the copper strip is an approximately mirror-like plane. When the light entering the module is incident on the surface, it will be reflected out through specular reflection and cannot be utilized, reducing the light intensity and causing 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 provide a production process for copper-aluminum composite strips for photovoltaic use and a V-shaped copper-aluminum composite strip.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A production process for copper-aluminum composite strips for photovoltaic use includes the following processes: strip body forming and surface forming. The process of strip body forming is to process a copper-aluminum composite wire into a copper-aluminum composite strip; the process of surface forming is to perform rolling processing on the copper-aluminum composite strip obtained after the strip body forming process, and form a V-shaped groove surface on the surface of the copper-aluminum composite strip. The V-shaped groove surface includes a number of V-shaped grooves.

[0009] In the V-groove surface forming, a V-groove forming device is used to continuously roll and form the copper-aluminum composite strip twice. The V-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 parallel to each other up and down. The V-shaped pressing roller is located between the upper pressing roller and the lower pressing roller, and both ends of the V-shaped pressing roller are inclined up and down. A forming gap one that is wider on the left and narrower on the right is formed between the lower pressing roller and the V-shaped pressing roller, and a forming gap two that is narrower on the left and wider 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 one and then through the forming gap two, and the V-groove surface is roll-formed twice by the V-shaped die part of the V-shaped pressing roller.

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

[0011] The present invention is further provided that the copper-aluminum composite wire includes an aluminum layer in the middle and a copper layer coated on the outer periphery of the aluminum layer.

[0012] The present invention is further provided that the process of strip forming 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 process of surface forming includes the following steps: V-groove surface forming, online annealing two, and drying two.

[0013] The present invention is further provided that step drawing one is: using a copper-aluminum composite wire with a diameter of 3 mm to 8 mm as the 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] Step rolling one is: rolling the copper-aluminum composite wire after step drawing one to obtain a copper-aluminum composite strip, and the reduction is 0.35 mm to 0.55 mm;

[0015] Step drawing two is: drawing the copper-aluminum composite strip after step rolling one, 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;

[0016] Step rolling two is: rolling the copper-aluminum composite strip after step drawing two, and the reduction is 0.06 mm to 0.2 mm;

[0017] Step rolling three is: rolling the copper-aluminum composite strip after step rolling two, and the reduction is 0.06 mm to 0.2 mm;

[0018] The third drawing process is to draw the copper-aluminum composite strip after the third rolling process. 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;

[0019] The fourth rolling process is to roll the copper-aluminum composite strip after the third drawing process. The reduction is 0.06 mm to 0.2 mm;

[0020] The fourth drawing process is to draw the copper-aluminum composite strip after the fourth rolling process. 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.

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

[0022] The present invention is further configured such that the second online annealing step includes the second conductive heating and the second water immersion annealing. The voltage of the second conductive heating is 12 to 15 V, the current is 300 to 450 A, the time of the conductive heating is 0.5 to 1.5 seconds, and the temperature of the V-shaped copper-aluminum composite strip after the conductive heating is 350 to 450 degrees; nitrogen protection is adopted during the second online annealing process.

[0023] The present invention is further configured such that after the V-shaped groove surface is formed, the height h of the V-shaped groove is 0.020 mm - 0.040 mm, 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 part of the V-shaped groove surface, and the low side of the groove edge is close to the low side part.

[0025] The present invention is further configured such that the V-shaped pressing roller includes a support shaft, a cylindrical roller body, and a bearing assembly. The support shaft is located between the lower pressing roller and the upper pressing roller. The cylindrical roller body is sleeved on the outer periphery of the support shaft. The cylindrical roller body is supported by the bearing assembly between the cylindrical roller body and the support shaft. The cylindrical roller body can rotate relative to the support shaft, and the axial ends of the cylindrical roller body can be adjusted to swing up and down; the V-shaped die 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 strip. By using the production process of the copper-aluminum composite strip for photovoltaic use as described above, the copper-aluminum composite wire is processed to obtain a V-shaped copper-aluminum composite strip with a V-shaped groove surface on the surface, which is suitable for use in the photovoltaic field.

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

[0028] In this solution, a copper-aluminum composite wire is used as the raw material to process a V-shaped copper-aluminum composite strip. The V-shaped copper-aluminum composite strip has electrical conductivity close to that of copper material, saves copper material, can reduce the production cost of the composite strip, and saves a large amount of copper resources. A V-shaped groove is formed on the surface of the V-shaped copper-aluminum composite strip. The V-shaped groove can reflect sunlight obliquely, and through secondary reflection, it can reach the surface of the photovoltaic component. The sunlight can be reused, thereby improving the utilization rate of sunlight, increasing the light intensity, and reducing the loss of irradiation amount.

[0029] By using a copper-clad aluminum copper-aluminum composite wire, after forming and processing, the outer surface of the V-shaped copper-aluminum composite strip is still the color and luster of copper material, and the appearance is the same as that of a pure copper strip, making its overall performance basically close to that of a pure copper strip. Moreover, since the raw material is a copper-clad aluminum composite wire, during the processing process, there is no need to perform composite processing on copper and aluminum materials, the composite processing steps can be omitted, and the combination of copper and aluminum materials is more uniform and stable.

[0030] In the V-shaped groove surface forming step, the V-shaped pressure roller can roll the surface of the copper-aluminum composite strip obliquely, and the formed V-shaped groove surface is in a slightly inclined state. Along the width direction of the strip, 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, and the situation of the high side and the low side of the groove edge corresponds to the inclined trend of the V-shaped groove surface. There is a certain height difference between the high side and the low side of the groove edge in the height direction. Due to the existence of the height difference between the two sides of the V-shaped groove, after the light shines into the V-shaped groove, more of the light can be reflected and leave from the direction of the low side of the groove edge, and thus can play a role in shaping and selecting the light to a certain extent.

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

[0032] 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, and the situation of the high side and the low side of the groove edge corresponds to the inclined trend of the V-shaped groove surface. There is a certain height difference s between the high side and the low side of the groove edge in the height direction. Due to the existence of the height difference between the two sides of the V-shaped groove, after the light shines into the V-shaped groove, more of the light can be reflected and leave from the direction of the low side of the groove edge, and thus can play a role in shaping and selecting the light to a certain extent.

[0033] In the V-groove forming device, there are a lower pressing roller, a V-shaped pressing roller, and an upper pressing roller. By using the same V-shaped pressing roller, it is possible to ensure that the inclination degrees on both sides of the V-groove surface are basically the same. The inclination directions during the two rolling processes are opposite, enabling more accurate and stable control of the inclination angles during the rolling of both sides. Moreover, by adjusting the inclination yaw 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 thickness of the required V-shaped copper-aluminum composite strip, improving the applicability of the equipment. Description of the Drawings

[0034] Figure 1 It is a flowchart of the production process of a copper-aluminum composite strip for a photovoltaic application in Example 1;

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

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

[0037] Figure 4 It is a schematic diagram of the V-groove surface forming step in Example 1;

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

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

[0040] Figure 7 For Figure 6 The enlarged view at A in

[0041] Figure 8 It is a schematic diagram of the V-groove surface forming step in Example 2 Figure 1 ;

[0042] Figure 9 It is a schematic diagram of the V-groove surface forming step in Example 2 Figure 2 ;

[0043] Figure 10 It is a schematic structural diagram of the V-groove forming device in Example 2 Figure 1 ;

[0044] Figure 11 It is a schematic structural diagram of the V-groove forming device in Example 2 Figure 2 ;

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

[0046] Figure 13It is a cross-sectional view of the V-shaped pressure roller in Embodiment 3;

[0047] Figure 14 It is a schematic structural diagram of the skew adjustment component in Embodiment 3.

[0048] Reference 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; high-side groove edge 311; low-side groove edge 312; low-side part 32; high-side part 33; lower pressure roller 4; first forming gap 40; V-shaped pressure roller 5; V-shaped die part 50; support shaft 51; cylindrical roller body 52; bearing assembly 53; inner ring 531; outer ring 532; spherical surface part 533; roller 534; upper pressure roller 6; second forming gap 60; inclined drive frame 7; guide wheel 71; lifting drive 72. Detailed implementation manners

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0050] Embodiment 1

[0051] This embodiment discloses a production process of a copper-aluminum composite strip for photovoltaic use. Referring to Figures 1 - 5 as shown, the copper-aluminum composite strip 20 for photovoltaic use is processed. The copper-aluminum composite wire 10 is used as the raw material. The middle of the copper-aluminum composite wire 10 is the aluminum layer 11, and the outer periphery is coated with the copper layer 12. Through multiple processes, the copper-aluminum composite wire 10 can be processed into the copper-aluminum composite strip 20. Moreover, the surface of the copper-aluminum composite strip 20 is further rolled, and a structure with a V-shaped groove 310 is processed on the surface of the copper-aluminum composite strip 20 to form the V-shaped copper-aluminum composite strip 30.

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

[0053] The specific production process includes the following steps: Drawing 1, Rolling 1, Drawing 2, Rolling 2, Rolling 3, Drawing 3, Rolling 4, Drawing 4, Online Annealing 1, Drying 1, V-groove surface forming, Online Annealing 2, Drying 2 and Wire Reeling. It can process the copper-aluminum composite wire into a copper-aluminum composite strip and form a V-groove surface on the surface of the copper-aluminum composite strip. Among them, Drawing 1, Rolling 1, Drawing 2, Rolling 2, Rolling 3, Drawing 3, Rolling 4, Drawing 4, Online Annealing 1, and Drying 1 are the processes for forming the first-step strip body; V-groove surface forming, Online Annealing 2, Drying 2 and Wire Reeling are the processes for forming the second-step surface.

[0054] The step of Drawing 1 is as follows: Using a copper-aluminum composite wire with a diameter of 3 mm to 8 mm as the 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, and among them, the mass of the copper material is at least 20% of the total mass of the copper-aluminum composite wire;

[0055] The step of Rolling 1 is: Rolling the copper-aluminum composite wire after Drawing 1 to obtain a copper-aluminum composite strip, and the reduction of the step of Rolling 1 is 0.35 mm to 0.55 mm;

[0056] The step of Drawing 2 is: Drawing the copper-aluminum composite strip after Rolling 1. In the step of Drawing 2, the drawing amount of the width of the copper-aluminum composite strip is 0.06 mm to 0.08 mm, and the drawing amount of the thickness of the copper-aluminum composite strip is 0.015 mm to 0.045 mm;

[0057] The step of Rolling 2 is: Rolling the copper-aluminum composite strip after Drawing 2. In the step of Rolling 2, the reduction of rolling is 0.06 mm to 0.2 mm;

[0058] The step of Rolling 3 is: Rolling the copper-aluminum composite strip after Rolling 2. In the step of Rolling 3, the reduction of rolling is 0.06 mm to 0.2 mm;

[0059] In the step of Rolling 2 and the step of Rolling 3, the two sides of the copper-aluminum composite strip are rolled successively, and the two rollings compensate each other, dispersing the single rolling amount to avoid situations such as cracking and breakage on the surface of the strip body;

[0060] The step of Drawing 3 is: Drawing the copper-aluminum composite strip after Rolling 3. In the step of Drawing 3, the drawing amount of the width of the copper-aluminum composite strip is 0.06 mm to 0.08 mm, and the drawing amount of the thickness of the copper-aluminum composite strip is 0.015 mm to 0.045 mm;

[0061] The step of Rolling 4 is: Rolling the copper-aluminum composite strip after Drawing 3. In the step of Rolling 4, the reduction of rolling is 0.06 mm to 0.2 mm;

[0062] Step drawing four is as follows: draw the copper-aluminum composite strip after step rolling four. In step drawing four, the drawing amount of the width of the copper-aluminum composite strip is 0.06 mm to 0.08 mm, and the drawing amount of the thickness of the copper-aluminum composite strip is 0.06 mm to 0.08 mm;

[0063] Step online annealing one includes conductive heating one and water immersion annealing one; the specific steps are as follows: first, conduct conductive heating on the copper-aluminum composite strip after step drawing four, and then conduct water immersion annealing. Among them, the voltage of conductive heating one is 15 - 17 V, the current is 500 A - 700 A, 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 immersion annealing one is 0.3 - 0.6 seconds, and the temperature of the copper-aluminum composite strip after coming out of the water ≤ 50 degrees. During the process of adopting step online annealing one, nitrogen protection measures are adopted to prevent the surface of the copper-aluminum composite strip from oxidation.

[0064] Step drying one is as follows: dry the copper-aluminum composite strip after step online annealing one, the drying temperature is 75 - 80 degrees, and the drying time is 3 - 5 seconds.

[0065] Step V-groove surface forming is as follows: adopt the method of roll forming. Use a V-shaped roll to roll the copper-aluminum composite strip after step drying one, and form a surface with V-shaped grooves on one side surface 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 0.020 mm - 0.040 mm, 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 as the height h is 0.037 mm ± 0.002 mm, and the angle A is 117° ± 2°.

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

[0067] The outer circumference of the V-shaped pressing roll 5 is formed with a V-shaped die part 50, and during the roll forming process, a V-groove surface 31 can be processed and formed on the corresponding side surface of the copper-aluminum composite strip 20.

[0068] Step online annealing two includes conductive heating two and water immersion annealing two. The specific steps are as follows: First, conduct conductive heating on the V-shaped copper-aluminum composite strip after the V-shaped groove surface forming in step V, and then conduct water immersion annealing. Among them, the voltage of conductive heating two 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 immersion annealing two is 0.3 - 0.6 seconds, and the temperature of the V-shaped copper-aluminum composite strip after coming out of the water ≤ 50 degrees. During the process of adopting step online annealing two, nitrogen protection measures are adopted to prevent the surface oxidation of the copper-aluminum composite strip.

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

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

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

[0072] The V-shaped copper-aluminum composite strip in this embodiment refers to 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 strip. One side of the V-shaped copper-aluminum composite strip is a V-shaped groove surface 31, and a V-shaped groove 310 is formed on the V-shaped groove surface 31. The V-shaped grooves 310 are distributed along the length direction of the composite strip, and each V-shaped groove 310 is arranged side by side along the width direction of the composite strip.

[0073] The tensile strength of the V-shaped copper-aluminum composite strip 30 is approximately 110MPa, the elongation rate 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 processing and forming V-shaped grooves 310 on the surface of the copper-aluminum composite strip, the surface of the V-shaped grooves 310 can reflect sunlight obliquely, and can reflect to the lateral direction of the copper-aluminum composite strip. Through secondary reflection, it 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 loss of irradiation amount.

[0075] Embodiment two

[0076] This embodiment discloses a production process of a copper-aluminum composite strip for photovoltaic use. On the basis of Embodiment one, with reference to Figure Figures 8 - 11 It is further described in detail, and the steps of V-shaped groove surface forming are further designed.

[0077] In a photovoltaic module, the components that convert light energy are distributed on both sides of the V-shaped copper-aluminum composite strip. If sunlight directly shines on the surface of the V-shaped copper-aluminum composite strip, the sunlight in this part cannot be directly utilized. Through the inclined reflection of light by the V-shaped groove 310, part of the sunlight is reflected to both sides, and then through the reflection of the surface material of the photovoltaic panel, part of the light can be reflected to the surface of the components that convert light energy, which can improve the utilization efficiency of part of the light energy.

[0078] Further, referring to Figure 6 As shown, the V-shaped groove surface 31 of the V-shaped copper-aluminum composite strip 30 can be set to be inclined. Along the width direction of the strip 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] For the V-shaped groove 310 corresponding to 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 situations of 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 height difference s between the groove edge high side 311 and the groove edge low side 312 in the height direction. Due to the height difference between the two side edges of the V-shaped groove 310, after the light shines into the V-shaped groove 310, more parts of the light can be reflected and leave from the direction of the groove edge low side 312, and thus can play a role in shaping and selecting the light to a certain extent.

[0080] Referring to 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 low side portions 32. The V-shaped groove surface 31 can form a structure with the middle bulging and decreasing towards the two side edges.

[0081] Further, in order to be able to process the V-shaped groove surface 31 with an inclined trend, the V-shaped groove forming device is further designed. Referring to Figure 8 、 Figure 9 As shown, in the V-shaped groove forming device, the V-shaped pressure roller 5 is inclined relative to the lower pressure roller 4, and thus the forming gap one 40 formed between the V-shaped pressure roller 5 and the lower pressure roller 4 also has an inclined trend, and a V-shaped groove surface 31 with an inclined trend can be processed.

[0082] During the forming process, the copper-aluminum composite strip 20 can be continuously roll-formed twice, and during the roll-forming process on both sides, the inclined directions of the V-shaped pressure roller 5 relative to the copper-aluminum composite strip 20 are opposite. Referring to Figure 8 、 Figure 9 As shown.

[0083] Referring to Figure 8As shown, during the rolling forming process, the left side of the V-shaped pressing roller 5 is at a lower height, and the upper surface of the left side of the copper-aluminum composite strip 20 is rolled. Refer to Figure 9 As shown, during the rolling forming process, the right side of the V-shaped pressing roller 5 is at a lower height, and the upper surface of the right side of the copper-aluminum composite strip 20 is rolled. By rolling and forming the two sides of the V-shaped groove surface 31, states with different trends can be formed on both sides of the V-shaped groove surface 31, forming a state where the middle bulges and slopes downward toward both sides.

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

[0085] Refer to Figure 10 、 Figure 11 As shown, the V-shaped 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 distributed from top to bottom. 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 one 40 that is wider on the left and narrower on the right is formed between the lower pressing roller 4 and the V-shaped pressing roller 5, and a forming gap two 60 that is narrower on the left and wider on the right is formed between the upper pressing roller 6 and the V-shaped pressing roller 5.

[0086] In the step of forming the V-shaped groove surface, the copper-aluminum composite strip 20 first passes through the forming gap one 40 and then through the forming gap two 60. The V-shaped groove 310 formed on the surface of the V-shaped groove surface 31 is roll-formed by the V-shaped die part 50 of the same V-shaped pressing roller 5, which can keep the groove shape of the V-shaped groove 310 basically consistent. Moreover, since the same V-shaped pressing roller 5 is used, the inclination degrees 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. Thus, during the roll-forming process, it can be ensured that the V-shaped pressing roller 5 can roll both sides of the V-shaped groove surface 31 respectively, forming an inclined trend with a higher middle and slightly lower sides.

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

[0089] Embodiment 3

[0090] This embodiment discloses a production process of a copper-aluminum composite strip for photovoltaic use. On the basis of Embodiment 2, with reference to Figure Figures 12 - 14 it will be further described in detail. The V-shaped groove forming device used in the step of forming the V-shaped groove surface is further designed, and accordingly, the step of forming the V-shaped groove will also be adjusted adaptively.

[0091] Refer to Figure 12As shown, the V-shaped pressing roller 5 includes 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 upper pressing roller 6, and is parallel 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 generate radial yaw. The V-shaped die part 50 is arranged on the outer periphery of the cylindrical roller body 52, and directly rolls the copper-aluminum composite strip 20 with the cylindrical roller body 52.

[0092] The support shaft 51 and the cylindrical roller body 52 are rotationally connected through the bearing assembly 53, and the bearing assembly 53 is installed at the middle position between 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 inside the cylindrical roller body 52. A spherical surface part 533 is formed on the inner periphery of the outer ring 532. The spherical surface part 533 and the inner ring 531 are rollingly supported by a plurality of rollers 534, so that stable rotation can be generated between the outer ring 532 and the inner ring 531, and the up-and-down yaw at both ends of the cylindrical roller body 52 can be realized.

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

[0094] In the bearing assembly 53, there are two outer rings 532, which are respectively sleeved at the axial two ends of the inner ring 531. The spherical surface parts 533 on the inner peripheries of the two outer rings 532 are symmetrically distributed, and it is ensured that the spherical surface parts 533 on the inner peripheries of the two outer rings 532 are in a concentric structure, and the center position of the spherical surface part 533 is concentric with the axis of the support shaft 51.

[0095] During the process of forming the V-groove surface, the central position of the copper-aluminum composite strip 20 is kept opposite to the central position of the cylindrical roller body 52; the center position of the spherical surface 533 of the spherical bearing component 53 (i.e., the yaw center of the bearing component 53) is generally kept vertically opposite to the central position of the copper-aluminum composite strip 20. During the process of adjusting the upper and lower inclination of both ends of the cylindrical roller body 52, the positions of the corresponding copper-aluminum composite strip 20 within the forming gap one 40 and the forming gap two 60 can be kept symmetrical. For example, when the right side of the cylindrical roller body 52 yaws downward, correspondingly, the left side of the cylindrical roller body 52 will yaw upward; within the forming gap one 40, the lower part of the cylindrical roller body 52 can roll the upper side of the copper-aluminum composite strip 20, and mainly roll and form the V-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 into the forming gap two 60, the upper part of the cylindrical roller body 52 can roll and form the V-groove surface 31 on the left side of the copper-aluminum composite strip 20, and can roll both sides of the same surface of the copper-aluminum composite strip 20 to form the V-groove surface 31 with a middle bulge and inclined downward on both sides.

[0096] Refer to Figure 14 As shown, deflection adjustment components are installed on the outer peripheries of both ends of the cylindrical roller body 52, which can adjust and limit the positions of both ends of the cylindrical roller body 52, and can keep the position of the cylindrical roller body 52 at a stable angular yaw position during the process of forming the V-groove surface, ensuring that the surface shapes of the belts formed in the same batch can be kept consistent.

[0097] The deflection adjustment component at each end of the cylindrical roller body 52 is divided into upper and lower parts, and the upper and lower parts are generally symmetrical. It includes an inclined drive frame 7 with an arc-shaped structure. Two guide wheels 71 are installed on the inclined drive frame 7, and the two guide wheels 71 are respectively pressed against the outer periphery of the cylindrical roller body 52 and are in rolling fit; moreover, 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 generating yaw in the horizontal direction. In addition, the inclined drive frame 7 is installed on the lifting drive 72, and the inclined drive frame 7 can be driven by the lifting drive 72 to lift and adjust. By adjusting the height of the inclined drive frame 7, the yaw amplitude of the end 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 keep the position stability of the cylindrical roller body 52, and in the way of mutual rolling, it can not only play a supporting role, but also keep the cylindrical roller body 52 rotating smoothly, and then can stably adapt to the up and down yaw adjustment state of the cylindrical roller body 52.

[0099] In this embodiment, by adjusting the inclined yaw angle of the cylindrical roller body 52, the inclined trend of the V-groove surface 31 can be adjusted, and specific adjustment can be made according to the thickness of the required V-shaped copper-aluminum composite strip 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 respectively adjusting the heights of the lower pressing roller 4 and the upper pressing roller 6, the heights of the forming gap one 40 and the forming gap two 60 can be adjusted to adapt to different thicknesses of the copper-aluminum composite strip 20, and the adaptability of the equipment can also be improved to a certain extent.

[0101] This embodiment also discloses a V-shaped copper-aluminum composite strip, which is produced by using the production process in this embodiment. In particular, the steps of forming the V-shaped groove are carried out by using the V-shaped groove forming device in this embodiment.

[0102] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements made 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 a copper-aluminum composite strip for photovoltaic use, characterized in that, The processes include the following: strip forming and surface forming. The process of strip forming is to process the copper-aluminum composite wire (10) into a copper-aluminum composite strip (20). The process of surface forming is to perform rolling on the copper-aluminum composite strip (20) obtained after the strip forming process, and form a V-grooved surface (31) on the surface of the copper-aluminum composite strip (20). The V-grooved surface (31) includes a number of V-grooves (310). In the V-grooved surface forming, the copper-aluminum composite strip (20) is continuously rolled and formed twice by a V-groove forming device. The V-groove forming device includes 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 parallel to each other vertically. The V-shaped pressing roller (5) is located between the upper pressing roller (6) and the lower pressing roller (4), and both ends of the V-shaped pressing roller (5) are inclined up and down. A first forming gap (40) that is wider on the left and narrower on the right is formed between the lower pressing roller (4) and the V-shaped pressing roller (5), and a second forming gap (60) that is narrower on the left and wider 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 first forming gap (40), and then passes through the second forming gap (60). The V-shaped groove part (50) of the V-shaped pressing roller (5) performs two rolling operations on the V-grooved surface (31). After the V-grooved surface is formed, a high side part (33) bulges upward in the middle of the V-grooved surface (31), and low side parts (32) are formed on both sides of the V-grooved surface (31). The V-grooved surface (31) gradually decreases from the high side part (33) in the middle to the low side parts (32) on both sides. The two sides of the V-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 copper-aluminum composite strip for photovoltaic use according to claim 1, characterized in that, The copper-aluminum composite wire (10) includes an aluminum layer (11) in the middle and a copper layer (12) covering the outer periphery of the aluminum layer (11).

3. The production process of the copper-aluminum composite strip for photovoltaic use according to claim 1, characterized in that, The process of strip forming includes the following steps: first drawing, first rolling, second drawing, second rolling, third rolling, third drawing, fourth rolling, fourth drawing, in-line annealing one, and drying one. The process of surface forming includes the following steps: V-grooved surface forming, in-line annealing two, and drying two.

4. The production process of the copper-aluminum composite strip for photovoltaic use according to claim 3, characterized in that, The step of first drawing is: using a copper-aluminum composite wire (10) with a diameter of 3 mm to 8 mm as the 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 step of first rolling is: rolling the copper-aluminum composite wire (10) after the first drawing step to obtain a copper-aluminum composite strip (20), and the reduction is 0.35 mm to 0.55 mm. The step of second drawing is: drawing the copper-aluminum composite strip (20) after the first rolling step, 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 step of second rolling is: rolling the copper-aluminum composite strip (20) after the second drawing step, and the reduction is 0.06 mm to 0.2 mm. The step of third rolling is: rolling the copper-aluminum composite strip (20) after the second rolling step, and the reduction is 0.06 mm to 0.2 mm. The third drawing process is to draw the copper-aluminum composite strip (20) after the third rolling process. 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 process is to roll the copper-aluminum composite strip (20) after the third drawing process. The reduction is 0.06 mm to 0.2 mm. The fourth drawing process is to draw the copper-aluminum composite strip (20) after the fourth rolling process. 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 copper-aluminum composite strip for photovoltaic use according to claim 3, characterized in that, The first in-line annealing process includes the first conductive heating and the first water-entry annealing. The voltage of the first conductive heating is 15 to 17 V, the current is 500 A to 700 A, the time of the conductive heating is 0.6 to 1.2 seconds, and the temperature of the copper strip after the conductive heating is 750 to 800 °C. The time of the first water-entry annealing is 0.3 to 0.6 seconds, and the temperature after leaving the water is ≤ 50 °C. During the first in-line annealing process, nitrogen protection is adopted.

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

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

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

9. The production process of the copper-aluminum composite strip for photovoltaic use according to claim 1, characterized in that, The V-shaped pressure roller (5) includes a support shaft (51), a cylindrical roller body (52), and a bearing assembly (53). The support shaft (51) is located between the lower pressure roller (4) and the upper pressure roller (6). The cylindrical roller body (52) is sleeved on the outer periphery of the support shaft (51). The cylindrical roller body (52) is supported by the bearing assembly (53) between the cylindrical roller body (52) and the support shaft (51). 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 with the copper-aluminum composite strip (20) by the cylindrical roller body (52).

10. A V-shaped copper-aluminum composite strip, characterized in that, Using the production process of the copper-aluminum composite strip for photovoltaic applications according to any one of claims 1-9, the copper-aluminum composite wire (10) is processed to obtain a V-shaped copper-aluminum composite strip (30) with a V-groove surface (31) on the surface.

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