Pressing mechanism and photovoltaic module welding equipment

Abstract

The utility model is suitable for the technical field of photovoltaic module welding, and provides a downward pressing mechanism and photovoltaic module welding equipment. The pressing assemblies are installed on the fixing plate, the number of the pressing assemblies is matched with that of the welding strips, each pressing assembly comprises at least one ceramic pressing column, and the ceramic pressing column of each pressing assembly is used for pressing the welding strips on the bus bars so that the welding strips can be welded to the bus bars; the bottom faces, making contact with the welding strips, of the ceramic pressing columns are arranged in a plane mode, and the contact area of the ceramic pressing columns of each pressing assembly and the corresponding welding strips is larger than or equal to one third of the welding area of the welding strips and the bus bars. According to the pressing mechanism, the ceramic pressing column is used for replacing a metal corrugated pressing column of photovoltaic module welding equipment, solder paste is not prone to being adhered to the ceramic pressing column, the ceramic pressing column is convenient to clean, meanwhile, the welding yield of a welding strip and a bus bar can be improved, and the reliability and the product yield of a photovoltaic module are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic module welding technical field especially relates to a kind of down mechanism and photovoltaic module welding equipment. BACKGROUND

[0002] In the process of photovoltaic module manufacturing, it is usually necessary to weld the busbar with the welding strip led out by the battery string to complete the series / parallel connection of the entire circuit. Among them, the welding strip and the busbar are welded to achieve a certain tension to ensure product quality, so as to avoid affecting the long-term reliability of the module.

[0003] In the prior art, the down mechanism of the photovoltaic module welding equipment usually includes a fixed plate and a metal corrugated pressing column fixed on the fixed plate. The fixed plate and the metal corrugated pressing column are moved downward by the lifting device of the photovoltaic module welding equipment, and the metal corrugated pressing column is used to press and contact the welding strip to weld the welding strip and the busbar. However, since the surface corrugated structure of the metal corrugated pressing column is easy to fill the tin paste, the tin paste remaining on the metal corrugated pressing column is easy to fall on the battery sheet, which is easy to cause the battery sheet to crack during lamination, and the tin paste remaining on the metal corrugated pressing column is not easy to clean. Moreover, the contact area between the metal corrugated pressing column and the welding strip cannot be controlled, which is easy to cause the pressing area to be too small during welding, resulting in poor welding and poor uniformity of welding tension, affecting the long-term reliability of the photovoltaic module and the product yield. SUMMARY

[0004] The utility model provides a kind of down mechanism, to solve the problem that the down mechanism of the photovoltaic module welding equipment of prior art exists metal corrugated pressing column easy tin paste remains, not easy to clean, and it is easy to cause welding strip and busbar to be welded badly, affect the long-term reliability of photovoltaic module and product yield.

[0005] The utility model is realized as follows: a kind of down mechanism is provided, and it is used for photovoltaic module welding equipment, including:

[0006] a fixed plate; and

[0007] a plurality of pressing components are installed on the fixed plate and matched with the number of welding strips, each pressing component includes at least one ceramic pressing column, and the ceramic pressing column of each pressing component is used to press the welding strip on the busbar to weld the welding strip and the busbar;

[0008] Among them, the bottom surface of the ceramic pressing column in contact with the welding strip is arranged in a plane, and the contact area of the ceramic pressing column of each pressing component with the corresponding welding strip is greater than or equal to one-third of the welding area of the welding strip and the busbar.

[0009] Preferably, the contact area between the ceramic pressing column of each pressing assembly and the corresponding solder strip is greater than or equal to two-thirds of the soldering area between the solder strip and the bus bar.

[0010] Preferably, each pressing assembly comprises at least two ceramic pressing columns arranged in sequence along the length direction of the solder strip.

[0011] Preferably, the ceramic pressing columns of each pressing assembly are arranged uniformly along the length direction of the solder strip.

[0012] Preferably, the bottom surface of the ceramic pressing column is connected to the side surface of the ceramic pressing column through a curved surface.

[0013] Preferably, the cross section of the ceramic pressing column is circular, square, triangular, trapezoidal or polygonal.

[0014] Preferably, the cross section of the ceramic pressing column is circular, the ceramic pressing column comprises a first end close to the fixed plate and a second end away from the fixed plate, and the diameter of the first end is greater than the diameter of the second end.

[0015] Preferably, the diameter of the ceramic pressing column gradually decreases from the first end to the second end.

[0016] Preferably, the distance between the two adjacent ceramic pressing columns of each pressing assembly is less than the diameter of the ceramic pressing column.

[0017] The utility model also provides a photovoltaic module welding equipment, including above-mentioned lower mechanism.

[0018] The utility model provides a kind of lower mechanism, by setting pressing assembly, each pressing assembly includes at least one ceramic pressing column, ceramic pressing column is used to press down solder strip to make solder strip and bus bar welding by using ceramic pressing column to replace the metal corrugated pressing column of photovoltaic module welding equipment;On the one hand, ceramic pressing column is not easy to stick tin paste compared with metal corrugated pressing column, and the bottom surface of ceramic pressing column and solder strip contact is flatly arranged, and ceramic pressing column is not easy to stick tin paste when pressing down solder strip, can avoid the situation that ceramic pressing column remains tin paste, tin paste falls on battery piece and leads to the situation that battery piece appears crack piece when laminating, and more convenient for the cleaning treatment of ceramic pressing column;On the other hand, by setting the contact area between the ceramic pressing column of each pressing assembly and the corresponding solder strip is greater than or equal to one-third of the soldering area between solder strip and bus bar, ensure that ceramic pressing column and solder strip have enough contact area, avoid the situation that ceramic pressing column pressure area is too small and leads to the situation that solder strip and bus bar appear virtual welding, welding tensile uniformity is poor and other welding defects, can improve the welding yield between solder strip and bus bar, so as to improve the reliability of photovoltaic module and product yield. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1A side view schematic diagram of a down-pressing mechanism is provided for the embodiment of the utility model;

[0020] Figure 2 A bottom view schematic diagram of a down-pressing mechanism is provided for the embodiment of the utility model;

[0021] Figure 3 A schematic diagram of a ceramic pressing column down-pressing welding strip of a photovoltaic module welding equipment is provided for the embodiment of the utility model;

[0022] Figure 4 A welding schematic diagram of a down-pressing welding strip and bus bar of a down-pressing mechanism is provided for the embodiment of the utility model;

[0023] Figure 5 A partial schematic diagram of a ceramic pressing column down-pressing welding strip of a photovoltaic module welding equipment is provided for the embodiment of the utility model;

[0024] Figure 6 A schematic diagram of a ceramic pressing column of a photovoltaic module welding equipment is provided for the embodiment of the utility model;

[0025] Figure 7 Another side view schematic diagram of a down-pressing mechanism is provided for the embodiment of the utility model;

[0026] Figure 8 Still another side view schematic diagram of a down-pressing mechanism is provided for the embodiment of the utility model. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the utility model more clear and intelligible, the following combines with the drawings and embodiments, and the utility model is further explained in detail. The examples of the embodiments are shown in the drawings, wherein the same or similar signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, and are only used to explain the utility model, and cannot be understood as the limitation of the utility model. In addition, it should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0028] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "back", "front" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as the limitation of the utility model.

[0029] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can include direct contact between the first and second features, or can include indirect contact between the first and second features through another feature therebetween. Moreover, the first feature "on", "above" and "on top of" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "underneath" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0030] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0031] The lower pressing mechanism provided by the present application comprises at least one ceramic pressing column, which replaces the metal corrugated pressing column of the photovoltaic module welding device in the related art, and is used for pressing the welding strip to make the welding strip welded with the bus bar. On the one hand, the ceramic pressing column is less likely to adhere to the solder paste, and since the bottom surface of the ceramic pressing column in contact with the welding strip is flat, the bottom surface of the ceramic pressing column has no corrugated structure. Compared with the metal corrugated pressing column, the flat bottom surface of the ceramic pressing column is less likely to adhere to the solder paste when pressing the welding strip, which can avoid the situation that the ceramic pressing column drops the solder paste on the battery piece during movement, resulting in the cracking of the battery piece during lamination. In addition, the contact area of the ceramic pressing column of each pressing assembly with the corresponding welding strip is greater than or equal to one third of the welding area of the welding strip with the bus bar, which ensures that the ceramic pressing column has sufficient contact area with the welding strip, avoids the situation that the welding strip and the bus bar are not welded well due to the small pressing area of the ceramic pressing column, and improves the reliability of the photovoltaic module and the product yield.

[0032] Please refer to Figures 1-5 The embodiment of the present application provides a lower pressing mechanism 100 for a photovoltaic module welding device, and the photovoltaic module welding device is used for welding a welding strip 200 and a bus bar 300. The lower pressing mechanism 100 comprises:

[0033] a fixing plate 1; and

[0034] a plurality of pressing assemblies 2 mounted on the fixing plate 1 and matched with the number of the solder strips 200, each of the pressing assemblies 2 comprising at least one ceramic pressing column 21, the ceramic pressing column 21 on each of the pressing assemblies 2 being used to press the solder strip 200 on the bus bar 300 so as to weld the solder strip 200 and the bus bar 300;

[0035] wherein the bottom surface 213 of the ceramic pressing column 21 in contact with the solder strip 200 is arranged in a plane, and the contact area of the ceramic pressing column 21 of each of the pressing assemblies 2 and the corresponding solder strip 200 is greater than or equal to one third of the welding area of the solder strip 200 and the bus bar 300.

[0036] In the embodiment of the utility model, the fixing plate 1 is used to fixedly mount a plurality of pressing assemblies 2, the plurality of pressing assemblies 2 are sequentially and spacedly arranged along the length direction of the fixing plate 1, and the ceramic pressing column 21 of each of the pressing assemblies 2 is sequentially and spacedly arranged along the width direction of the fixing plate 1. Wherein, the number of the pressing assemblies 2 is same as the number of the solder strips 200, and each of the pressing assemblies 2 is used to press the corresponding solder strip 200. For example, the solder strips 200 corresponding to the bus bar 300 are 6, and the number of the pressing assemblies 2 is set to 6; for another example, the solder strips 200 corresponding to one bus bar 300 are 8, and the number of the pressing assemblies 2 is 8. Wherein Figure 3 The number of the solder strips 200 shown is 6.

[0037] Wherein, the fixing plate 1 is connected with the lifting device of the photovoltaic module welding equipment, and the lifting device of the photovoltaic module welding equipment can drive the fixing plate 1 and the plurality of pressing assemblies 2 to synchronously lift, so as to drive each of the ceramic pressing columns 21 to press the corresponding solder strip 200, so that the solder strip 200 and the bus bar 300 are welded.

[0038] Specifically, the photovoltaic module welding equipment further comprises a welding platform, the bus bar 300 is placed on the welding platform, and then the plurality of solder strips 200 are sequentially and spacedly arranged on the bus bar 300, and the arrangement direction of each of the solder strips 200 is perpendicular to the length direction of the bus bar 300. The solder strips 200 are heated by the welding platform, the tin paste on the solder strips 200 is melted, each of the ceramic pressing columns 21 of the pressing assemblies 2 moves downward to press the corresponding solder strip 200, so that the solder strip 200 and the bus bar 300 are welded, and the pressing assemblies 2 move upward to reset.

[0039] Wherein, as shown in Figure 4 and Figure 5As shown, the contact area of the ceramic pressing column 21 of each pressing assembly 2 with the corresponding solder strip 200 is S1, that is, the area of the contact region of the ceramic pressing column 21 of each pressing assembly 2 with the corresponding solder strip 200 is S1; the welding area of each solder strip 200 with the bus bar 300 is S2, that is, the area of the contact region of each solder strip 200 with the bus bar 300 is S2, and S1 is greater than or equal to (1 / 3)S2. Preferably, the contact area of the ceramic pressing column 21 of each pressing assembly 2 with the corresponding solder strip 200 is less than the welding area of each solder strip 200 with the bus bar 300, that is, S1 is less than S2, which can not only ensure the contact area of the ceramic pressing column 21 of each pressing assembly 2 with the corresponding solder strip 200, but also reduce the material usage of the ceramic pressing column 21.

[0040] In the embodiment of the utility model, the fixing mode of each pressing assembly 2 installed on the fixed plate 1 is not limited. For example, the pressing assembly 2 can be detachably fixed by screws or bolts, or can be fixedly connected in a threaded manner.

[0041] In the embodiment of the utility model, the lower pressing mechanism 100 provided by the utility model is provided with the pressing assembly 2, each pressing assembly 2 comprises at least one ceramic pressing column 21, the ceramic pressing column 21 on each pressing assembly 2 is used for pressing the solder strip 200 to make the solder strip 200 welded with the bus bar 300, and the ceramic pressing column 21 replaces the metal corrugated pressing column of the photovoltaic module welding equipment in the related art. On the one hand, the ceramic pressing column 21 is more difficult to adhere to the solder paste than the metal corrugated pressing column, so that when the ceramic pressing column 21 presses and welds the solder strip 200, the solder paste on the solder strip 200 is difficult to adhere to the bottom surface 213 of the ceramic pressing column 21, and the situation that the cell sheet is cracked during lamination due to the residual solder paste of the ceramic pressing column 21 falling on the cell sheet can be avoided. Moreover, since the bottom surface 213 of the ceramic pressing column 21 is arranged in a plane, the cleaning of the ceramic pressing column 21 is facilitated. On the other hand, by controlling the contact area of the ceramic pressing column 21 of each pressing assembly 2 with the corresponding solder strip 200 to be greater than or equal to one third of the welding area of the solder strip 200 with the bus bar 300, the sufficient contact area of the ceramic pressing column 21 with the solder strip 200 is ensured, the welding yield between the solder strip 200 and the bus bar 300 can be improved, and the reliability and product yield of the photovoltaic module can be improved.

[0042] As an embodiment of the utility model, the contact area of the ceramic pressing column 21 of each pressing assembly 2 with the corresponding solder strip 200 is greater than or equal to two thirds of the welding area of the solder strip 200 with the bus bar 300.

[0043] In the embodiment, by controlling the contact area between the ceramic pressing column 21 of each pressing assembly 2 and the corresponding solder strip 200 to be greater than or equal to two-thirds of the soldering area of the solder strip 200 and the bus bar 300, the pressing area of the ceramic pressing column 21 on the solder strip 200 can be further increased, the soldering tension and uniformity of the solder strip 200 and the bus bar 300 are further improved, and the long-term reliability and product yield of the photovoltaic module are further improved; meanwhile, the ceramic pressing column 21 is prevented from being in full contact with the solder strip 200, the amount of ceramic pressing column 21 material used can be saved, and the cost is reduced.

[0044] As an embodiment of the utility model, each pressing assembly 2 includes at least two ceramic pressing columns 21 arranged along the length direction of the solder strip 200.

[0045] In the embodiment, each pressing assembly 2 can specifically include two ceramic pressing columns 21, three ceramic pressing columns 21 or more ceramic pressing columns 21. Each pressing assembly 2 includes at least two ceramic pressing columns 21 arranged along the length direction of the solder strip 200, compared with only one ceramic pressing column 21, the contact area between the ceramic pressing column 21 and the corresponding solder strip 200 can be more, the solder strip 200 and the bus bar 300 can be pressed more uniformly, and the soldering yield between the solder strip 200 and the bus bar 300 can be further improved. In other embodiments, each pressing assembly 2 can also include only one ceramic pressing column 21.

[0046] As an embodiment of the utility model, the ceramic pressing column 21 of each pressing assembly 2 is uniformly and spacedly arranged along the length direction of the solder strip 200.

[0047] In the embodiment, each pressing assembly 2 includes at least two ceramic pressing columns 21, and the ceramic pressing column 21 of each pressing assembly 2 is uniformly and spacedly arranged along the length direction of the solder strip 200, so that the contact area between the ceramic pressing column 21 and the solder strip 200 can be more uniformly distributed in the soldering area of the solder strip 200 and the bus bar 300, the solder strip 200 and the bus bar 300 can be pressed more uniformly, and the soldering yield can be further improved. Of course, in other embodiments, the ceramic pressing column 21 of each pressing assembly 2 can also be arranged to be non-uniformly and spacedly arranged along the length direction of the solder strip 200.

[0048] Please refer to Figure 6 As an embodiment of the utility model, the bottom surface 213 of the ceramic pressing column 21 and the side surface 214 of the ceramic pressing column 21 are connected through the arc surface 215.

[0049] In the embodiment, the bottom surface 213 of the ceramic pressing column 21 and the ceramic pressing column 21 are connected through the arc surface 215, so that the connection position between the bottom surface 213 of the ceramic pressing column 21 and the side surface 214 of the ceramic pressing column 21 is smoother, the tin paste on the solder strip 200 can be further prevented from remaining on the ceramic pressing column 21, and the ceramic pressing column 21 is more convenient to clean.

[0050] As a preferred embodiment of the utility model, the cross section of the ceramic pressing column 21 is circular, square, triangular, trapezoidal or polygonal. Preferably, the cross section of the ceramic pressing column 21 is circular, facilitating the processing of the ceramic pressing column 21 and the control of the contact area size of the ceramic pressing column 21 and the corresponding solder strip 200. Of course, the cross section of the ceramic pressing column 21 can also be some irregular shape.

[0051] Please refer to Figure 7 As an embodiment of the utility model, the cross section of the ceramic pressing column 21 is circular, and the ceramic pressing column 21 includes a first end 211 close to the fixed plate 1 and a second end 212 away from the fixed plate 1, and the diameter of the first end 211 is greater than that of the second end 212.

[0052] In this embodiment, the cross section of the ceramic pressing column 21 is circular, i.e. the ceramic pressing column 21 is in the shape of an inverted circular truncated cone. The diameter of the first end 211 is greater than that of the second end 212, which can make the structural strength of the ceramic pressing column 21 high, prolong the service life, and facilitate the installation of the ceramic pressing column 21. Of course, in other embodiments, as shown in Figure 1 The ceramic pressing column 21 can be a standard cylindrical structure, i.e. the diameter of the ceramic pressing column 21 is the same everywhere, facilitating the processing of the ceramic pressing column 21.

[0053] In this embodiment, the diameter of the ceramic pressing column 21 gradually decreases from the first end 211 to the second end 212, i.e. the diameter of the ceramic pressing column 21 gradually decreases from the first end 211 to the second end 212, which facilitates the processing and forming of the ceramic pressing column 21, is conducive to improving the structural strength of the ceramic pressing column 21, prolonging the service life, and facilitating the installation of the ceramic pressing column 21.

[0054] Please refer to Figure 8 As another embodiment of the utility model, the cross section of the ceramic pressing column 21 is circular, and the ceramic pressing column 21 includes a first end 211 close to the fixed plate 1 and a second end 212 away from the fixed plate 1, and the diameter of the first end 211 is less than that of the second end 212, which can reduce the amount of ceramic pressing column 21 material while ensuring the contact area requirement of the ceramic pressing column 21 and the solder strip 200, thereby reducing the production cost.

[0055] In this embodiment, the diameter of the ceramic pressing column 21 gradually increases from the first end 211 to the second end 212, i.e. the diameter of the ceramic pressing column 21 gradually increases from the first end 211 to the second end 212, which facilitates the processing and forming of the ceramic pressing column 21, and can ensure the contact area of the ceramic pressing column 21 and the solder strip 200, while reducing the production cost.

[0056] As an embodiment of the utility model, the distance between the two adjacent ceramic pressing columns 21 of each pressing assembly 2 is less than the diameter of the ceramic pressing column 21.

[0057] In the embodiment, the distance between the two adjacent ceramic pressing columns 21 of each pressing assembly 2 is less than the diameter of the ceramic pressing column 21, which ensures that the area of the ceramic pressing column 21 not in contact with the solder strip is less than the area of the ceramic pressing column 21 in contact with the solder strip, and makes the contact area between the ceramic pressing column 21 and the solder strip 200 more dense, which is beneficial to further improve the soldering yield of the solder strip 200 and the bus bar 300, and also reduces the material usage of the ceramic pressing column 21.

[0058] In some possible embodiments, the distance between the two adjacent ceramic pressing columns 21 of each pressing assembly 2 near the edge of the bus bar 300 is less than the distance between the two adjacent ceramic pressing columns 21 located in the middle of the bus bar 300, that is, the distribution density of the ceramic pressing columns 21 at the edge of the pressing assembly 2 is greater, which is beneficial to increase the contact area of the edge ceramic pressing column 21 on the solder strip 200, improve the soldering tension between the edge of the bus bar 300 and the solder strip 200, and further improve the soldering yield of the bus bar 300 and the solder strip 200.

[0059] The utility model embodiment further provides a photovoltaic module welding equipment, including the pressing mechanism of above -mentioned embodiment. Among them, photovoltaic module welding equipment still includes welding platform (not shown), lifting device (not shown), and the pressing mechanism sets up above the welding platform, and the lifting device is connected with the pressing mechanism. The lifting device can be a pneumatic cylinder or a hydraulic cylinder. The bus bar 300 is placed on the welding platform, and the solder strips 200 led out by the solar cell string are sequentially and spacedly arranged on the bus bar 300, and the arrangement direction of each solder strip 200 is perpendicular to the length direction of the bus bar 300. The solder strip 200 is heated by the welding platform, so that the solder paste on the solder strip 200 is melted, the lifting device can drive the fixed plate 1 together with each pressing assembly 2 to synchronously lift, each pressing assembly 2 presses the solder strip 200 on the welding platform, so that the solder strip 200 is welded with the bus bar 300, so that the solder strip 200 is welded with the bus bar 300, and the pressing assembly 2 is reset upward, so that the solder strip 200 is welded with the bus bar 300.

[0060] The above is only a preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A press-down mechanism for a photovoltaic module welding apparatus, comprising: The utility model relates to a down-pressing mechanism for welding strip, comprising: a fixed plate; and a plurality of pressing assemblies mounted on the fixed plate and matched with the number of welding strips, each of the pressing assemblies comprising at least one ceramic pressing column, the ceramic pressing column of each of the pressing assemblies being used to press the welding strip on the bus bar so as to weld the welding strip with the bus bar; wherein the bottom surface of the ceramic pressing column in contact with the welding strip is arranged in a plane, and the contact area of the ceramic pressing column of each of the pressing assemblies with the corresponding welding strip is greater than or equal to one-third of the welding area of the welding strip with the bus bar.

2. The press-down mechanism of claim 1, wherein The contact area of the ceramic pressing column of each of the pressing assemblies with the corresponding welding strip is greater than or equal to two-thirds of the welding area of the welding strip with the bus bar.

3. The press-down mechanism of claim 1, wherein Each of the pressing assemblies comprises at least two ceramic pressing columns arranged in sequence and spaced apart along the length direction of the welding strip.

4. The press-down mechanism of claim 3, wherein The ceramic pressing columns of each of the pressing assemblies are uniformly spaced apart along the length direction of the welding strip.

5. The press-down mechanism of claim 1, wherein The bottom surface of the ceramic pressing column is connected with the side surface of the ceramic pressing column through a curved surface.

6. The press-down mechanism of claim 1, wherein The cross section of the ceramic pressing column is circular, square, triangular, trapezoidal or polygonal.

7. The press-down mechanism of claim 1, wherein The cross section of the ceramic pressing column is circular, the ceramic pressing column comprises a first end close to the fixed plate and a second end away from the fixed plate, and the diameter of the first end is greater than that of the second end.

8. The press-down mechanism of claim 7, wherein The diameter of the ceramic pressing column gradually decreases from the first end to the second end.

9. The press-down mechanism of claim 1, wherein The distance between the two adjacent ceramic pressing columns of each of the pressing assemblies is less than the diameter of the ceramic pressing column.

10. A photovoltaic module welding apparatus characterized by, The utility model relates to a down-pressing mechanism for welding strip, comprising: a fixed plate; and a plurality of pressing assemblies mounted on the fixed plate and matched with the number of welding strips, each of the pressing assemblies comprising at least one ceramic pressing column, the ceramic pressing column of each of the pressing assemblies being used to press the welding strip on the bus bar so as to weld the welding strip with the bus bar; wherein the bottom surface of the ceramic pressing column in contact with the welding strip is arranged in a plane, and the contact area of the ceramic pressing column of each of the pressing assemblies with the corresponding welding strip is greater than or equal to one-third of the welding area of the welding strip with the bus bar.

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