Photovoltaic module welding machine press and stringer

Abstract

This application provides a photovoltaic module welding machine fixture and a string welding machine, relating to the technical field of photovoltaic cell related equipment. The photovoltaic module welding machine fixture includes a pressure plate and ejector pins. The ejector pins are used to hold the welding strip, and several ejector pins are configured, with at least a portion of each ejector pin fixedly connected to the pressure plate. A hollow portion is provided at the end of the ejector pin away from the pressure plate. It is evident that the hollow portion significantly increases the three-dimensional heat transfer channel, making it easier for the ejector pin to follow the temperature changes of the welding heat source, avoiding temperature lag or localized overheating caused by heat storage in the solid material. Furthermore, it shortens the heat conduction path from the interior to the surface, making the temperature distribution on the ejector pin surface more uniform, thereby ensuring that the heat input received by each area of ​​the welding strip tends to be consistent, ultimately achieving effective control of defects such as incomplete welds and over-welds.

Description

Technical Field

[0001] This application relates to the field of photovoltaic cell-related equipment technology, and in particular to a photovoltaic module welding press and string welding machine. Background Technology

[0002] In the photovoltaic module manufacturing system, cell stringing is a core process that determines product performance. Traditional welding machine fixtures use a pin structure to mechanically apply pressure to fix the cells and welding strips before welding. However, in practical applications, this design has significant drawbacks: because the contact pressure between the pin and the cell surface is difficult to distribute evenly, insufficient contact often occurs in the bonding area between the welding strip and the cell electrodes, leading to connection abnormalities during welding. These connection defects directly affect the electrical performance of the module, not only reducing photoelectric conversion efficiency but also shortening the module's service life and adversely impacting product reliability.

[0003] To address the aforementioned issues, the industry has attempted improvements by adjusting welding temperature and optimizing welding strip materials. While these measures have alleviated the problems to some extent, they have failed to address the fundamental flaw in the press fixture structure design: insufficient uniformity of contact during ejector pin pressure application. Therefore, developing a novel press fixture structure capable of achieving balanced pressure transmission is particularly necessary.

[0004] It should be noted that the above content is not necessarily prior art, nor is it intended to limit the scope of patent protection of this application. Utility Model Content

[0005] This application provides a photovoltaic module welding press and a string welding machine to solve the problem that the contact pressure between the pin and the surface of the cell is difficult to distribute evenly, and that the bonding area between the welding strip and the cell electrode often has insufficient local contact, which leads to connection abnormalities during the welding process.

[0006] As one aspect of the embodiments of this application, this application provides a photovoltaic module welding machine fixture, including:

[0007] Pressure plate;

[0008] Ejector pin, the ejector pin being used to hold the solder strip;

[0009] The ejector pins are configured in a plurality of units, and at least a portion of each ejector pin is fixedly connected to the pressure plate;

[0010] The end of the ejector pin away from the pressure plate has a hollowed-out section.

[0011] Optionally, the ejector pin includes a needle body, the needle body including an abutment portion for pressing and holding the solder strip;

[0012] The hollowed-out portion is located near the abutting portion, at the axis of the needle body, and is in communication with the outside atmosphere.

[0013] Optionally, the ejector pin further includes a base and a syringe. The base is fixedly connected to the pressure plate, and the syringe includes a first end and a second end opposite to each other. The first end of the syringe is used to connect to the needle body, and the second end of the syringe is detachably connected to the base.

[0014] Optionally, the needle body includes an integrally formed first column and a second column;

[0015] The syringe is configured with a cavity structure, which is defined as a receiving cavity. The first column is slidably disposed within the receiving cavity, and the second column is partially located within the receiving cavity and partially protrudes from the receiving cavity.

[0016] Optionally, the radial dimension of the second column is smaller than the radial dimension of the first column.

[0017] Optionally, the ejector pin further includes a reset member disposed within the receiving cavity, one end of which abuts against the first end of the syringe and the other end of which abuts against the first column.

[0018] Optionally, the hollowed-out portion is provided with a high-temperature resistant ceramic coating.

[0019] Optionally, the cutout extends to the abutting portion, creating a gap between the solder strip and the needle body.

[0020] Optionally, the cutout portion is configured as cylindrical or prismatic.

[0021] As another aspect of the embodiments of this application, the embodiments of this application provide a string welding machine, including a welding component, a ribbon conveying component and a cell conveying component, as well as a photovoltaic module welding machine fixture as described above, wherein the photovoltaic module welding machine fixture is disposed downstream of the ribbon conveying component.

[0022] The embodiments of this application employing the above-described technical solution may have the following advantages:

[0023] This application provides a photovoltaic module welding machine fixture and string welding machine. The photovoltaic module welding machine fixture includes a pressure plate and ejector pins. The ejector pins are used to hold the welding strip. Several ejector pins are configured, and at least a portion of each ejector pin is fixedly connected to the pressure plate. The end of the ejector pin away from the pressure plate has a hollowed-out portion. The hollowed-out portion significantly increases the three-dimensional heat transfer channel. The hollowed-out portion makes it easier for the ejector pin to follow the temperature change of the welding heat source, avoiding temperature lag or local overheating caused by heat storage in the solid material. On the other hand, the hollowed-out portion can be regarded as "thinning" the wall thickness of the ejector pin, shortening the heat conduction path from the inside to the surface, making the surface temperature distribution of the ejector pin more uniform, thereby ensuring that the heat input received by each area of ​​the welding strip tends to be consistent, and ultimately achieving effective control of defects such as cold solder joints and over-soldering. The hollowed-out portion is essentially a structural innovation that transforms the ejector pin into a composite component with both mechanical support and thermal management functions without affecting the mechanical fixing function, meeting the manufacturing requirements of high efficiency and high reliability of photovoltaic modules. Attached Figure Description

[0024] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0025] Figure 1 This is a schematic diagram of the planar structure of the photovoltaic module welding machine press provided in the embodiments of this application;

[0026] Figure 2 This is a schematic diagram of the planar structure of the ejector pin provided in the embodiments of this application;

[0027] Figure 3 To distinguish from Figure 2 A cross-sectional planar structural diagram of another type of ejector pin.

[0028] Explanation of reference numerals in the attached figures:

[0029] 10-Pressure plate; 20-Ejector pin; 21-Base; 22-Syringe; 221-First end; 222-Second end; 223-Accommodation cavity; 23-Needle body; 231-First column; 232-Second column; 233-Abutting part; 24-Hollowed-out part; 25-Reset part. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The application will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0032] In this application, the term "numerical interval" (i.e., numerical range) refers to a range of values. Unless otherwise specified, the distribution of selectable values ​​within this numerical interval is considered continuous, and includes the two endpoints (i.e., the minimum and maximum values) of the interval, as well as every value between these endpoints. Unless otherwise specified, when a numerical interval refers only to integers within that interval, it includes the two endpoints of the range and every integer between them, effectively listing every integer. When multiple numerical ranges are provided to describe features or characteristics, these ranges can be merged. In other words, unless otherwise specified, the numerical ranges disclosed in this application should be understood to include any and all subranges included therein. The "numerical value" in this numerical interval can be any quantitative value, such as a number, percentage, or proportion. The term "numerical interval" can broadly include percentage intervals, proportion intervals, ratio intervals, and other quantitative intervals.

[0033] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. It should be understood that these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein.

[0034] This application provides a string welding machine, which includes a welding assembly, a ribbon conveying assembly, a cell conveying assembly, and a photovoltaic module welding fixture. The photovoltaic module welding fixture is located downstream of both the ribbon conveying assembly and the cell conveying assembly. The photovoltaic module welding fixture is used to hold the ribbon, and the welding assembly welds the ribbon to the cells at a preset position. Please refer to the following: Figure 1 and Figure 2The photovoltaic module welding machine fixture of this solution includes a pressure plate 10 and ejector pins 20. The ejector pins 20 are used to hold the welding strip. Several ejector pins 20 are configured, and at least a portion of each ejector pin 20 is fixedly connected to the pressure plate 10. A hollow portion 24 is provided at the end of the ejector pin 20 away from the pressure plate 10. It can be seen that by using the photovoltaic module welding machine fixture of this application, the setting of the hollow portion 24 significantly increases the three-dimensional channel for heat transfer. The hollow portion 24 makes it easier for the ejector pin 20 to follow the temperature change of the welding heat source, avoiding temperature lag or local overheating caused by heat storage in the solid material. On the other hand, the setting of the hollow portion 24 can be regarded as "thinning" the wall thickness of the ejector pin 20, shortening the heat conduction path from the inside to the surface, making the surface temperature distribution of the ejector pin 20 more uniform, thereby ensuring that the heat input received by each area of ​​the welding strip tends to be consistent, and ultimately achieving effective control of defects such as cold welding and over-welding. The hollowed-out part 24 is essentially a structural innovation that transforms the ejector pin 20 into a composite component that combines mechanical support and thermal management functions without affecting the mechanical fixing function, thus meeting the manufacturing requirements of high efficiency and high reliability of photovoltaic modules.

[0035] Furthermore, such as Figure 1 As shown, the definition Figure 1 The arrows A1 and A2 indicate the first direction. The pressure plate 10 of this application has N sets of ejector pins (N is a positive integer greater than or equal to 1), and each set includes M ejector pins (M is a positive integer greater than 1). The M ejector pins are evenly arrayed along the first direction. Specifically, in this embodiment, N is 7 and M is 12. The advantage of this arrangement is that it achieves efficient pressure and heat conduction and improves welding stability through a dense and uniform support layout. The uniform distribution of 12 ejector pins 20 within a single set can form continuous support points along the extension direction of the welding strip, ensuring that the pressure of the pressure plate 10 is applied evenly to the contact surface between the welding strip and the cell, avoiding poor welding or cell damage caused by local pressure imbalance. The configuration of 7 ejector pin sets can cover the entire welding area according to mainstream cell sizes (such as 182mm and 210mm), especially suitable for welding requirements of multi-busbar cells. Multi-point support simultaneously optimizes the heat conduction path, making the welding strip more evenly heated along its length, reducing welding defects caused by local overheating or insufficient heat. This design strikes a balance between support density and structural complexity. The array of 12 pins (20 pins each) satisfies the support precision required for multi-busbar welding while avoiding the cost and maintenance issues associated with redundant designs. Its regular layout also facilitates modular assembly and localized maintenance, improving equipment durability. Furthermore, the uniform array offers strong adaptability, allowing for flexible compatibility with different sized solar cells by finely adjusting the spacing between the pin groups, reducing process debugging costs and meeting the current demands for high-efficiency, high-reliability photovoltaic module production.

[0036] Furthermore, such as Figure 2 and Figure 3As shown, the ejector pin 20 includes a pin body 23, which includes an abutment portion 233 for holding the solder strip. A perforated portion 24 is positioned near the abutment portion 233 at the axis of the pin body 23, communicating with the outside atmosphere. This configuration reduces the volume of the solid portion of the pin body 23, lowering the heat capacity and allowing heat to be transferred more quickly to the abutment portion 233 and the solder strip. Simultaneously, the perforated portion 24 at the axis forms a central heat dissipation channel, preventing localized heat accumulation. Communication with the outside atmosphere allows air convection to participate in heat exchange. Natural or forced airflow helps regulate the temperature of the abutment portion 233, further balancing the heat distribution on the solder strip contact surface and reducing welding defects caused by localized overheating (over-soldering) or insufficient heat (insufficient soldering). Figure 2 The directions indicated by arrows B1 and B2 are the second direction. Figure 3 Except for the setting position of the hollow part 24 and Figure 2 The differences are in the middle, but the other structures remain the same, that is... Figure 2 and Figure 3 With the same perspective and direction definition, the ejector pin 20 also includes a base 21 and a syringe 22 arranged along the second direction. The base 21 is fixedly connected to the pressure plate 10. The syringe 22 includes a first end 221 and a second end 222 opposite to each other. The first end 221 of the syringe 22 is used to connect the needle body 23, and the second end 222 of the syringe 22 is detachably connected to the base 21. As a vulnerable component that directly participates in welding, holding, and heat conduction, the syringe 22 is prone to wear, oxidation, or thermal deformation under long-term high temperature and high pressure conditions. The detachable structure of the syringe 22 and the base 21 allows for the individual replacement of a failed syringe 22 (such as wear of the contact part 233 or blockage of the hollow channel) without disassembling the pressure plate 10 or replacing the base 21. This focuses maintenance costs on vulnerable parts and avoids the waste of "overall scrapping". Because the base 21 is fixedly connected to the pressure plate 10 and does not directly contact the welding strip, it has a low wear rate and can be reused for a long time, significantly improving the economy of the press system. In automated production lines, the detachable design supports the quick disassembly and assembly of the syringe 22. With the pre-installation of spare syringes 22, "replace as soon as it is damaged" can be achieved, reducing the single maintenance time to the minute level and significantly reducing downtime losses.

[0037] like Figure 3As shown, the needle body 23 in this embodiment includes an integrally formed first column 231 and second column 232. The first column 231 and the second column 232 have a smooth transition or a bent transition. The needle cylinder 22 is configured as a cavity structure, which is defined as a receiving cavity 223. The first column 231 is slidably disposed in the receiving cavity 223, and the second column 232 is partially located in the receiving cavity 223 and partially protrudes from the receiving cavity 223. With this configuration, the sliding fit allows the needle body 23 to float slightly along the axial direction of the receiving cavity 223, adapting to the slight differences on the surface of the solar cell or the changes in the thickness of the silicon wafer, reducing the risk of wafer cracking caused by rigid contact. The integrally formed structure with a bent or smooth transition eliminates weak points in the connection, reduces stress concentration, and improves fatigue resistance. The guiding function of the receiving cavity 223 ensures that the installation accuracy error of the ejector pin 20 is small, and by replacing the needle body 23 with different bending angles or lengths, it can quickly adapt to diverse process requirements such as multi-busbar welding and ultra-thin silicon wafers. Furthermore, this design reduces the weight of the ejector pin 20 while ensuring efficient heat conduction, balancing lightweight design with structural strength. It effectively balances mechanical buffering, precision control, and process adaptability, providing crucial support for high-yield string soldering. More specifically, in this embodiment, the radial dimension of the second column 232 is smaller than the radial dimension of the first column 231, such as... Figure 3 As shown, the first column 231 and the second column 232 are bent and transitioned, and a suspended part is formed between the second column 232 and the accommodating cavity 223. This suspended part can be regarded as a side hollow. The side hollow and the hollow part 24 mentioned above together construct a multi-directional heat conduction path, forming a three-dimensional convection circulation to avoid local heat accumulation.

[0038] In some optional embodiments, the ejector pin 20 further includes a reset member 25, which is disposed within the receiving cavity 223 along the second direction. One end of the reset member 25 abuts against the first end 221 of the syringe 22, and the other end abuts against the first column 231. Specifically, in this embodiment, the reset member 25 is configured as a spring. Under normal conditions, the spring is in a compressed state. This configuration enables a floating effect through the elastic support of the spring. The elastic deformation capability of the spring allows the needle body 23 to autonomously adjust its extension amount according to the micro-undulations of the cell surface or the difference in silicon wafer thickness, avoiding local stress concentration caused by rigid contact and effectively reducing the risk of microcracks in the silicon wafer. This floating mechanism ensures that the solder ribbon and the cell maintain uniform and stable contact pressure during the welding process. Even if there is slight surface warping or positional deviation, the buffering effect of the spring can maintain pressure balance through adaptive adjustment, reducing problems such as poor soldering or solder ribbon displacement caused by sudden pressure changes.

[0039] In some alternative embodiments, the cutout portion 24 is configured as cylindrical or prismatic, and the cutout portion 24 may extend close to the abutment portion 233, such as... Figure 2 As shown, it can also be extended directly to the contact portion 233, such as... Figure 3 As shown, Figure 3The placement of the hollow section 24 creates a gap between the solder strip and the pin body 23, optimizing heat conduction and contact. The regularly shaped hollow section 24 can construct a symmetrical heat conduction path, improving the uniformity of heat diffusion. Its layout, close to or directly reaching the contact section 233, can shorten the heat transfer distance, reduce the heat capacity of the ejector pin 20, and make the temperature response more sensitive. Figure 3 The gap design between the solder strip and the needle body 23 allows air convection to directly act on the welding interface, suppressing local heat accumulation through natural heat dissipation and avoiding over-welding due to overheating of the solder strip or pressure concentration caused by excessive contact area. This structure ensures the support force of the needle body 23 for the solder strip while utilizing the perforations and gaps to form a "thermal buffer" space, balancing contact pressure and heat input. This effectively improves the uniformity of solder melting, reduces defects such as incomplete welds and cracks, and meets the dual requirements of high-precision welding processes for thermal management and mechanical properties.

[0040] In some optional embodiments, the length of the ejector pin 20 along the second direction is configured to be 10-20mm, the width along the first direction is configured to be 5-10mm, and the cross-section of the hollow part 24 along the axial direction is configured to be rectangular with dimensions L×H, where L ranges from 5-8mm and H ranges from 2-4mm. With this configuration, the size of the ejector pin 20 is adapted to mainstream welding scenarios, and the cross-sectional design of the hollow part 24 increases the heat conduction path, balances structural strength and thermal management effect, and improves welding uniformity and reliability.

[0041] Preferably, the needle body 23 is made of metal. In this embodiment, the needle body 23 is made of aluminum alloy, and the hollow part 24 is provided with a high-temperature resistant ceramic coating. The aluminum alloy body is lightweight and thermally conductive. Combined with the hollow part 24 with the high-temperature resistant ceramic coating, the durability and thermal efficiency can be significantly improved.

[0042] In some optional embodiments, the first column 231 and the second column 232 of the needle body 23 are both cylindrical, or both are prismatic, or one of the first column 231 and the second column 232 is cylindrical and the other is prismatic. Different combinations of column shapes balance smooth sliding and structural stability, adapting to diverse welding pressures and precision requirements. Such embodiments all fall within the protection scope of this utility model. Specifically, as... Figure 3 The pin 20 shown in this embodiment has a second column 232 of the pin body 23 configured as a cylinder with a diameter of 5mm. The hollow part 24 is also configured as a cylinder with a diameter of 2mm. The hollow part 24 is precisely manufactured by CNC machining and has an anti-oxidation treatment on the surface. The cylindrical design is conducive to precision machining and uniform stress distribution. The anti-oxidation treatment can improve durability and thermal conductivity stability.

[0043] In summary, the photovoltaic module welding machine fixture and string welding machine provided by this utility model include a pressure plate 10 and ejector pins 20. The ejector pins 20 are used to hold the welding strip. Several ejector pins 20 are configured, and at least a portion of each ejector pin 20 is fixedly connected to the pressure plate 10. A hollow portion 24 is provided at the end of the ejector pin 20 away from the pressure plate 10. It can be seen that by using the photovoltaic module welding machine fixture of this application, the setting of the hollow portion 24 significantly increases the three-dimensional channel for heat transfer. The hollow portion 24 makes it easier for the ejector pin 20 to follow the temperature change of the welding heat source, avoiding temperature lag or local overheating caused by heat storage in the solid material. On the other hand, the setting of the hollow portion 24 can be regarded as "thinning" the wall thickness of the ejector pin 20, shortening the heat conduction path from the inside to the surface, making the surface temperature distribution of the ejector pin 20 more uniform, thereby ensuring that the heat input received by each area of ​​the welding strip tends to be consistent, and ultimately achieving effective control of defects such as cold welding and over-welding. The hollowed-out part 24 is essentially a structural innovation that transforms the ejector pin 20 into a composite component that combines mechanical support and thermal management functions without affecting the mechanical fixing function, thus meeting the manufacturing requirements of high efficiency and high reliability of photovoltaic modules.

[0044] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0045] For ease of description, directional terms such as "front, back, up, down, left, right," "horizontal, vertical, horizontal," and "top, bottom" generally indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are used solely for the purpose of facilitating the description of this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the referred mechanism or element must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the components themselves. For example, if a device in the drawings is inverted, a device described as "above" or "on top of" other devices or structures will subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0046] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] Unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0049] It should also be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this application.

[0050] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0051] It should also be noted that the above are merely preferred embodiments of this application and do not limit the scope of patent protection of this application. Any equivalent structural or procedural changes made using the content of this application’s specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A photovoltaic module welding machine press, characterized in that, include: Pressure plate (10); A push pin (20) is used to hold the solder strip; The ejector pins (20) are configured in a plurality of units, and at least a portion of each ejector pin (20) is fixedly connected to the pressure plate (10); The ejector pin (20) has a hollow part (24) at the end away from the pressure plate (10).

2. The photovoltaic module welding press according to claim 1, characterized in that, The ejector pin (20) includes a pin body (23), the pin body (23) includes an abutment portion (233), the abutment portion (233) is used to press the welding strip; The hollowed-out part (24) is located near the abutting part (233) and is situated at the axis of the needle body (23), communicating with the outside atmosphere.

3. The photovoltaic module welding machine fixture according to claim 2, characterized in that, The ejector pin (20) also includes a base (21) and a syringe (22). The base (21) is fixedly connected to the pressure plate (10). The syringe (22) includes a first end (221) and a second end (222) opposite to each other. The first end (221) of the syringe (22) is used to connect to the needle body (23). The second end (222) of the syringe (22) is detachably connected to the base (21).

4. The photovoltaic module welding machine fixture according to claim 3, characterized in that, The needle body (23) includes an integrally formed first column (231) and a second column (232); The syringe (22) is configured as a cavity structure, which is defined as a receiving cavity (223). The first column (231) is slidably disposed in the receiving cavity (223), and the second column (232) is partially located in the receiving cavity (223) and partially protrudes out of the receiving cavity (223).

5. The photovoltaic module welding machine fixture according to claim 4, characterized in that, The radial dimension of the second column (232) is smaller than the radial dimension of the first column (231).

6. The photovoltaic module welding machine press according to claim 4 or 5, characterized in that, The ejector pin (20) also includes a reset member (25), which is disposed in the accommodating cavity (223). One end of the reset member (25) abuts against the first end (221) of the syringe (22), and the other end abuts against the first column (231).

7. The photovoltaic module welding press according to claim 2, characterized in that, The hollow part (24) is provided with a high-temperature resistant ceramic coating.

8. The photovoltaic module welding press according to any one of claims 2-5 and 7, characterized in that, The hollow portion (24) extends to the abutting portion (233), so that there is a gap between the welding strip and the needle body (23).

9. The photovoltaic module welding machine fixture according to any one of claims 1-5 and 7, characterized in that, The hollowed-out portion (24) is configured as a cylinder or a prism.

10. A string welding machine, comprising a welding assembly, a ribbon conveying assembly, and a cell conveying assembly, characterized in that, It also includes a photovoltaic module welding machine fixture as described in any one of claims 1-9, wherein the photovoltaic module welding machine fixture is located downstream of the welding strip transport assembly.

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