Preparation device and preparation method of black photovoltaic welding strip

Abstract

This invention relates to the field of photovoltaic ribbon technology, and discloses a preparation apparatus and method for black photovoltaic ribbon. The preparation apparatus includes an unwinding assembly, a blackening assembly, a drying assembly, and a winding assembly. The blackening assembly includes a horizontal plate, a mold support on the horizontal plate, and a mold assembly on the mold support. The mold assembly includes a mold and a paint application section. A horizontal strip-shaped hole is provided at the center of the mold. A vertical cylindrical flow channel is provided at the center of the top of the mold, extending downwards to communicate with the horizontal strip-shaped hole. The paint application section includes a fixing plate and a paint application tube penetrating the fixing plate. The upper end of the paint application tube is a paint inlet, and the lower end is a paint outlet, communicating with the cylindrical flow channel. A paint box is provided above the mold assembly, with the paint box's outlet communicating with the paint inlet. The black photovoltaic ribbon prepared by this invention has a uniform black ink coating, matching well with black solar cells; and the back of the black photovoltaic ribbon does not have ink adhering to it, thus not affecting the welding of the grid lines on the solar cells.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic ribbon technology, and specifically to a preparation apparatus and method for black photovoltaic ribbon. Background Technology

[0002] With the continuous development of photovoltaic module technology, in order to further improve the power of modules, all-black modules composed of black solar cells have begun to emerge. To match these all-black modules, black photovoltaic solder ribbons have also been developed. Black photovoltaic solder ribbons consist of one surface of a standard photovoltaic solder ribbon coated with black ink, while the remaining surfaces retain their original ribbon shape. The black-coated side faces outwards and, together with the black solar cells, forms an all-black module, while the uncoated side is used for soldering to the grid lines on the solar cells.

[0003] Because black photovoltaic ribbons only require black coating on one side, while the other side must not be contaminated by black ink, production is quite challenging. Traditional spraying and self-flowing methods struggle to prevent ink contamination on the back side, and the ink coating is often uneven, affecting the fit between the ribbon and the black solar cell. Furthermore, ink adhering to the back side can hinder cell welding, reducing cell efficiency.

[0004] There is an urgent need to develop a preparation device and method for black photovoltaic ribbons that can avoid ink contamination on the back side and achieve uniform ink coating. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a device and method for preparing black photovoltaic ribbon, which can effectively solve the problems of ink contamination on the back of black photovoltaic ribbon affecting the welding of solar cells, reducing the efficiency of solar cells, and affecting the matching between black photovoltaic ribbon and black solar cells due to uneven ink coating.

[0006] To achieve the above objectives, the present invention employs the following technical solutions.

[0007] A device for preparing black photovoltaic welding ribbon includes: an unwinding module, a blackening module, a drying module, and a winding module; the welding ribbon substrate enters the blackening module from the unwinding module for blackening, then enters the drying module for drying, and finally enters the winding module for winding.

[0008] The blackening component includes a horizontal plate, a mold support is provided on the horizontal plate, and a mold assembly is provided on the mold support; the mold assembly includes a mold and a paint application part, and a horizontal strip hole is provided in the center of the mold; a vertical cylindrical flow channel is provided in the center of the top of the mold, and the cylindrical flow channel extends downward to communicate with the horizontal strip hole;

[0009] The paint application section includes a fixed plate and a paint application tube vertically fixed on the fixed plate; the top of the mold has four first screw holes at the four corners, and the fixed plate has four second screw holes at the four corners corresponding to the first screw holes; the fixed plate is fixed to the top of the mold by bolts.

[0010] The paint inlet pipe passes through the fixed plate; the upper end of the paint inlet pipe is the paint inlet, and the lower end is the paint outlet. The paint outlet is connected to the upper end of the cylindrical flow channel; a paint box is set above the mold assembly. The outlet of the paint box is connected to the paint inlet through a pipe. Black ink is placed inside the paint box.

[0011] Preferably, the blackening component further includes a vibration component, which is disposed on a horizontal plate behind the mold;

[0012] The vibration assembly includes a base, a horizontal motor mounted on the upper surface of the base, and a cam connected to the output shaft of the motor; multiple vertical guide rods mounted on the base, with floating plates connected to the guide rods, and the cam rotating to periodically abut against the lower surface of the floating plate; multiple parallel rollers mounted on the floating plate on the same horizontal plane; the extension direction of the rollers is perpendicular to the transmission direction of the welding strip substrate, and the highest point of the multiple rollers is flush with the horizontal strip hole of the mold.

[0013] More preferably, the diameter of the roller is 35mm, and the number of rollers is 10-15.

[0014] Preferably, the height of the horizontal strip hole is 0.3-0.7 mm greater than the thickness of the solder strip substrate, and the width of the horizontal strip hole is 0.05-0.1 mm greater than the width of the solder strip substrate.

[0015] Preferably, the diameter of the cylindrical flow channel is equal to or slightly larger than the width of the solder strip substrate.

[0016] Preferably, the drying component is a horizontal drying oven.

[0017] The method for preparing black photovoltaic ribbon based on the above-mentioned black photovoltaic ribbon preparation apparatus includes the following steps:

[0018] Step 1: Unwind the welding strip substrate by passing it through the horizontal strip hole of the mold and then applying a black coating.

[0019] Step 2: Vibrate and level the blackened photovoltaic solder ribbon;

[0020] Step 3: After the photovoltaic ribbon has been vibrated and leveled, it is dried to obtain black photovoltaic ribbon;

[0021] Step 4: Rewind the black photovoltaic welding ribbon.

[0022] Preferably, the black ink used in step 1 comprises acrylic resin and urea resin.

[0023] Preferably, the rotational speed of the cam during the oscillation flow in step 2 is 3000 r / min.

[0024] Preferably, the drying temperature in step 3 is 140-160℃ and the drying time is 30-60s.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] The black photovoltaic ribbon prepared by this invention has a uniform black ink coating on one side, which matches well with the black solar cell. Furthermore, when the black photovoltaic ribbon is coated with black ink on one side, no ink sticks to the back side, thus avoiding contamination of the other side of the black photovoltaic ribbon by the black ink. This does not affect the welding of the grid lines on the solar cell and does not affect the efficiency of the solar cell. Attached Figure Description

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0028] Figure 1 This is a schematic diagram of the apparatus for preparing black photovoltaic ribbon;

[0029] Figure 2 This is a cross-sectional view of the mold assembly in the preparation device;

[0030] Figure 3 This is a front view of the vibration component in the fabrication apparatus;

[0031] Figure 4 This is a right view of the vibration component in the preparation device;

[0032] The attached figures are labeled as follows:

[0033] 1. Unwinding assembly; 2. Coating assembly; 3. Drying assembly; 4. Rewinding assembly; 21. Horizontal plate; 22. Mold support; 23. Mold assembly; 24. Paint box; 25. Vibration assembly; 231. Mold; 232. Paint application section; 233. Horizontal strip hole; 234. Cylindrical flow channel; 235. Paint application tube; 251. Base; 252. Motor; 253. Cam; 254. Floating plate; 255. Roller. Detailed Implementation

[0034] The embodiments of the present invention will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are only for illustrating the present invention and should not be regarded as limiting the scope of the present invention.

[0035] refer to Figure 1This is a schematic diagram of the structure of a device for preparing black photovoltaic ribbon. The device includes: an unwinding assembly 1, a blackening assembly 2, a drying assembly 3, and a winding assembly 4; the ribbon substrate 5 enters the blackening assembly from the unwinding assembly for blackening, then enters the drying assembly for drying, and finally enters the winding assembly for winding; the drying assembly 3 is preferably a horizontal drying oven.

[0036] The blackening component 2 includes a horizontal plate 21, a mold support 22 is mounted on the horizontal plate 21, and a mold assembly 23 is mounted on the mold support 22; for example... Figure 2 As shown, the mold assembly 23 includes a mold 231 and a painting part 232. The mold 231 has a horizontally penetrating strip hole 233 at its center. The top center of the mold 231 has a vertical cylindrical flow channel 234 that extends downward to communicate with the horizontal strip hole 233. In order to achieve a single-sided black coating effect, the height of the horizontal strip hole 233 is 0.3-0.7 mm greater than the thickness of the solder strip substrate, and the width of the horizontal strip hole is 0.05-0.1 mm greater than the width of the solder strip substrate. The diameter of the cylindrical flow channel 234 is equal to or slightly larger than the width of the solder strip substrate, but not exceeding 0.5 mm.

[0037] The paint application section 232 includes a fixing plate and a paint application tube 235 vertically fixed on the fixing plate; the top four corners of the mold 231 are provided with first screw holes, and the four corners of the fixing plate are provided with second screw holes corresponding to the first screw holes. The fixing plate is fixed to the top of the mold by bolts.

[0038] The paint inlet tube 235 passes through the fixed plate; the upper end of the paint inlet tube is the paint inlet, and the lower end is the paint outlet. The paint outlet is connected to the upper end of the cylindrical flow channel 234; a paint box 24 is provided above the mold assembly 23. The outlet of the paint box 24 is connected to the paint inlet through a pipe. Black ink is placed inside the paint box 24.

[0039] In the above embodiment, the solder ribbon substrate is unwound by the unwinding assembly and enters the blackening assembly, passing through the horizontal strip-shaped hole of the mold. Black ink enters the paint supply tube from the paint box, and then enters the cylindrical flow channel from the paint outlet of the paint supply tube. The black ink flows downward along the cylindrical flow channel to the horizontal strip-shaped hole and adheres to the upper surface of the solder ribbon substrate. As the solder ribbon substrate moves forward continuously, the black ink forms a uniform coating on the upper surface of the solder ribbon substrate, completing the blackening process of the solder ribbon substrate. After blackening, the solder ribbon substrate is dried and wound up to obtain black photovoltaic solder ribbon.

[0040] Furthermore, the blackening component 2 also includes a vibration component 25, which is disposed on a horizontal plate 21 behind the mold and is used to vibrate and level the black ink on the upper surface of the solder strip substrate to make the black ink coating uniform.

[0041] like Figure 3 and Figure 4As shown, the vibration assembly 25 includes a base 251, a horizontal motor 252 mounted on the upper surface of the base 251, and a cam 253 connected to the output shaft of the motor 252. Multiple vertical guide rods are mounted on the base, and floating plates 254 are connected to the guide rods. The rotation of the cam periodically abuts the lower surface of the floating plates. Multiple parallel rollers 255 are mounted on the floating plates 254, located on the same horizontal plane. The extension direction of the rollers is perpendicular to the transmission direction of the welding strip substrate, and the highest point of the rollers is flush with the horizontal slot 233 of the mold. To achieve better vibration and leveling effects, the roller diameter is 35mm, and the number of rollers is 10-15.

[0042] In the above embodiment, the blackened solder strip substrate passes through the horizontal strip hole and enters the vibration assembly, where it is conveyed along the surface of the roller. A motor drives a cam to rotate at high speed, causing the cam to periodically contact the lower surface of a floating plate, thus vibrating the floating plate at high speed. This, in turn, causes the roller to vibrate at high speed, resulting in the blackened solder strip substrate vibrating rapidly during transport. Under this high-speed vibration, the black ink flows and levels on the surface of the solder strip substrate. The vibration of the solder strip substrate is related to the diameter and number of rollers; the optimal vibration and leveling effect is achieved when the roller diameter is 35mm and the number of rollers is 10-15.

[0043] A method for preparing black photovoltaic ribbon based on the above-mentioned black photovoltaic ribbon preparation apparatus includes the following steps:

[0044] Step 1: Unwind the welding strip substrate by passing it through the horizontal strip hole of the mold and then applying a black coating.

[0045] As the solder strip substrate passes through the horizontal slot of the mold, its upper surface is coated with black ink. The conveying speed of the solder strip substrate is controlled at 15-20 m / min.

[0046] Because the gap between the horizontal slot and the solder strip substrate is very small, and the diameter of the cylindrical flow channel is the same as or similar to the width of the solder strip substrate, the black ink will not penetrate to the other side of the solder strip substrate along the gap, but will be coated black on only one side of the upper surface of the solder strip substrate. The black ink consists of acrylic resin and urea resin.

[0047] Step 2: Vibrate and level the blackened photovoltaic solder ribbon;

[0048] Because of the high viscosity of the ink and the tendency of the ink to flow along the edge of the horizontal strip hole, the black ink coating on both sides of the solder ribbon substrate is thicker than that in the middle. Therefore, the solder ribbon substrate after blackening needs to be put into the vibration assembly for vibration leveling treatment.

[0049] In the oscillating leveling process, the cam rotates at 3000 r / min. After the oscillating leveling process, the ink surface becomes smooth and uniform under the action of external force.

[0050] Step 3: After the photovoltaic ribbon has been vibrated and leveled, it is dried to obtain black photovoltaic ribbon;

[0051] Specifically, a horizontal drying oven is used for drying at a temperature of 140-160℃ for 30-60 seconds. The thickness of the dried black ink is 0.01-0.02 mm. After the black ink on the surface of the solder ribbon substrate is dried, a black photovoltaic solder ribbon is obtained.

[0052] Step 4: Rewind the black photovoltaic welding ribbon.

[0053] The black photovoltaic ribbon prepared by this invention has a uniform black ink coating on one side, which matches well with the black solar cell. Furthermore, when the black photovoltaic ribbon is coated with black ink on one side, no ink sticks to the back side, thus avoiding contamination of the other side of the black photovoltaic ribbon by the black ink. This does not affect the welding of the grid lines on the solar cell and does not affect the efficiency of the solar cell.

[0054] Although the present invention has been described in detail in this specification with general description and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention are within the scope of protection claimed by the present invention.

Claims

1. An apparatus for preparing black photovoltaic ribbon, characterized in that, include: The unwinding assembly (1), the blackening assembly (2), the drying assembly (3), and the winding assembly (4) are provided. The welding strip substrate (5) enters the blackening assembly from the unwinding assembly for blackening, then enters the drying assembly for drying, and then enters the winding assembly for winding. The blackening component (2) includes a horizontal plate (21), on which a mold support (22) is provided, and on which a mold assembly (23) is provided; the mold assembly (23) includes a mold (231) and a paint application part (232), and the center of the mold (231) is provided with a horizontally penetrating strip hole (233); the height of the horizontal strip hole is 0.3-0.7 mm greater than the thickness of the solder strip substrate, and the width of the horizontal strip hole is 0.05-0.1 mm greater than the width of the solder strip substrate; the top center of the mold (231) is provided with a vertical cylindrical flow channel (234), and the cylindrical flow channel (234) extends downward to communicate with the horizontal strip hole (233); The paint application part (232) includes a fixing plate and a paint application tube (235) vertically fixed on the fixing plate; the mold (231) has first screw holes at the four corners of the top, and the fixing plate has second screw holes at the four corners corresponding to the first screw holes. The fixing plate is fixed to the top of the mold by bolts. The paint inlet tube (235) passes through the fixed plate; the upper end of the paint inlet tube is the paint inlet, and the lower end is the paint outlet, which is connected to the upper end of the cylindrical flow channel (234); a paint box (24) is provided above the mold assembly (23), and the outlet of the paint box (24) is connected to the paint inlet through a pipe, and black ink is placed inside the paint box (24); The blackening component (2) also includes a vibration component (25), which is disposed on a horizontal plate (21) behind the mold; The vibration assembly (25) includes a base (251), a horizontal motor (252) is provided on the upper surface of the base (251), and a cam (253) is connected to the output shaft of the motor (252); multiple vertical guide rods are provided on the base, and floating plates (254) are connected to the guide rods; the cam rotates and periodically abuts the lower surface of the floating plate; multiple parallel rollers (255) located on the same horizontal plane are provided on the floating plate (254); the extension direction of the rollers is perpendicular to the transmission direction of the welding strip substrate, and the highest point of the multiple rollers is flush with the horizontal strip hole (233) of the mold.

2. The apparatus for preparing black photovoltaic ribbon according to claim 1, characterized in that, The diameter of the roller is 35mm, and the number of rollers is 10-15.

3. The apparatus for preparing black photovoltaic ribbon according to claim 1, characterized in that, The diameter of the cylindrical flow channel (234) is equal to or slightly larger than the width of the solder strip substrate (5).

4. The apparatus for preparing black photovoltaic ribbon according to claim 1, characterized in that, The drying component (3) is a horizontal drying oven.

5. A method for preparing black photovoltaic ribbon based on the apparatus for preparing black photovoltaic ribbon according to claim 1, characterized in that, Includes the following steps: Step 1: Unwind the welding strip substrate by passing it through the horizontal strip hole of the mold and then applying a black coating. Step 2: Vibrate and level the blackened photovoltaic solder ribbon; Step 3: After the photovoltaic ribbon has been vibrated and leveled, it is dried to obtain black photovoltaic ribbon; Step 4: Rewind the black photovoltaic welding ribbon.

6. The preparation method according to claim 5, characterized in that, The black ink used in step 1 for blackening comprises acrylic resin and urea resin.

7. The preparation method according to claim 5, characterized in that, In step 2, the rotational speed of the cam during the oscillation flow is 3000 r / min.

8. The preparation method according to claim 5, characterized in that, The drying temperature in step 3 is 140-160℃, and the drying time is 30-60s.

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