Welding bottom plate structure and photovoltaic cell welding equipment with same

Abstract

The invention provides a welding bottom plate structure and photovoltaic cell welding equipment with the same. The welding bottom plate structure comprises a bottom plate main body, at least three groups of through holes and an air draft component, the at least three groups of through holes are formed in the bottom plate main body at intervals in the first direction, each group of through holes comprises a plurality of through holes which are formed at intervals in the second direction, and each through hole comprises at least two hole sections which are communicated in sequence; the air draft component is arranged at the bottom of the bottom plate body and communicates with the at least three sets of through holes so as to conduct air draft on the interiors of the through holes. Wherein the first direction is perpendicular to the second direction, and the cross sectional area of the through hole is gradually increased in the direction from the top face to the bottom face of the bottom plate body. The problem that tin is not solidified after welding and the yield is affected due to the fact that a battery welding bottom plate is not cooled in time in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery welding bottom plate cooling, and in particular to a welding bottom plate structure and photovoltaic cell sheet welding equipment having the same. Background Art

[0002] At present, back-contact battery modules play an increasingly important role in the photovoltaic industry. The welding process is particularly critical and directly affects the performance and quality of the modules. In the welding process, in order to ensure that the solder solidifies quickly and stabilizes the connection between the battery cell and the solder ribbon, it is generally used to open small holes on the welding bottom plate for cooling.

[0003] However, the existing cooling method has exposed two major problems in practical application: First, the cooling range is limited. For large-area battery cells, it is difficult to achieve comprehensive and uniform cooling by blowing air only through small holes, resulting in the failure of timely solidification of the tin after soldering, increasing the risk of detachment between the solder ribbon and the battery cell, and directly affecting the product yield; second, the problem of air volume control. Although excessive air volume can accelerate the cooling process to a certain extent, it will also destroy the balance of the bottom plate adsorption vacuum, affecting the stability of the welding process and the accuracy of the solder joints. If the air volume is too small, the problem of slow cooling cannot be effectively solved. The solidification time of the solder is prolonged, which not only reduces production efficiency, but may also affect the welding quality due to improper temperature control, increase the failure rate of components, and limit the further optimization and application of back-contact battery welding technology. Summary of the invention

[0004] The main purpose of the present invention is to provide a welding base plate structure and photovoltaic cell welding equipment having the same, so as to solve the problem in the prior art that the battery welding base plate is not cooled in time, resulting in the tin not solidifying after welding, thus affecting the yield rate.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a welding base plate structure, comprising: a base plate body; at least three groups of through holes, which are arranged on the base plate body at intervals along a first direction, each group of through holes includes a plurality of through holes arranged at intervals along a second direction, and each through hole includes at least two hole segments connected in sequence; an exhaust component, which is arranged at the bottom of the base plate body and is respectively connected to the at least three groups of through holes to exhaust air in each through hole; wherein the first direction and the second direction are arranged perpendicular to each other, and the cross-sectional area of ​​the through hole gradually increases along the direction from the top surface to the bottom surface of the base plate body.

[0006] Furthermore, each through hole includes a first hole segment and a second hole segment which are sequentially connected along a direction from the top surface to the bottom surface of the bottom plate body.

[0007] Further, when the first hole segment and the second hole segment are both strip-shaped holes; the opening length of the first hole segment is smaller than the opening length of the second hole segment; or, the opening width of the first hole segment is smaller than the opening width of the second hole segment; or, the opening length and opening width of the first hole segment are respectively smaller than the opening length and opening width of the second hole segment.

[0008] Further, when the first hole segment is a strip hole and the second hole segment is a strip hole whose opening gradually expands from the top surface to the bottom surface of the bottom plate body; the opening length of the second hole segment gradually increases from the top surface to the bottom surface of the bottom plate body, and the maximum opening width of the first hole segment is consistent with the minimum opening width of the second hole segment; or, the opening width of the second hole segment gradually increases from the top surface to the bottom surface of the bottom plate body, and the maximum opening length of the first hole segment is consistent with the minimum opening width of the second hole segment.

[0009] Furthermore, when the first hole segment and the second hole segment are both strip holes that open and gradually expand in the direction from the top surface to the bottom surface of the bottom plate body, the maximum opening length of the first hole segment is consistent with the minimum opening length of the second hole segment, and the maximum opening width of the first hole segment is consistent with the minimum opening width of the second hole segment.

[0010] Furthermore, the opening length L1 of the first hole segment satisfies: 78 mm ≤ L1 ≤ 93 mm, and the opening width W1 of the first hole segment satisfies: 5 mm ≤ W1 ≤ 12 mm.

[0011] Furthermore, the opening length L2 of the second hole segment satisfies: 93 mm ≤ L1 ≤ 108 mm, and the opening width W2 of the second hole segment satisfies: 12 mm ≤ W2 ≤ 19 mm.

[0012] Furthermore, the exhaust component includes: at least two exhaust ducts, each exhaust duct has a plurality of exhaust ports, the plurality of exhaust ports are respectively connected to parts of at least three groups of through holes, and at least one exhaust port can be selectively connected to a through hole; an exhaust fan, respectively connected to at least two exhaust ducts, to exhaust air from each through hole.

[0013] Furthermore, the base plate body is provided with at least two guide members spaced apart along the first direction, each guide rod is provided with a plurality of installation grooves for accommodating the welding strip spaced apart along the second direction, and some through holes are correspondingly located between two adjacent installation grooves along the second direction. According to another aspect of the present invention, a photovoltaic cell welding device is provided, comprising the welding base plate structure mentioned above.

[0014] By applying the technical solution of the present invention, a welding base plate structure is provided, comprising a base plate main body, at least three groups of through holes and an exhaust component; the at least three groups of through holes are arranged on the base plate main body at intervals along a first direction, each group of through holes comprises a plurality of through holes arranged at intervals along a second direction, and each through hole comprises at least two hole sections connected in sequence; the exhaust component is arranged at the bottom of the base plate main body and is respectively connected to the at least three groups of through holes to exhaust air in each through hole; wherein the first direction and the second direction are arranged perpendicular to each other, and the cross-sectional area of ​​the through hole gradually increases along the direction from the top surface to the bottom surface of the base plate main body.

[0015] In this way, during the exhaust cooling process, the air volume can be more evenly distributed in each through hole, thereby ensuring that the temperature of the welding area can drop quickly and evenly. In addition, it helps the solder to solidify quickly, avoids tin slag residue on the base plate body, improves the welding quality, and reduces problems such as solder joint detachment or tin bead formation caused by untimely cooling, thereby improving the product yield rate, and further solves the problem in the prior art that the battery welding base plate is not cooled in time, resulting in the tin not solidifying after welding, affecting the yield rate. At the same time, the design of at least two hole sections connected in sequence allows the air volume to be adjusted under different cooling requirements. At the connection of at least two hole sections, the air volume can be precisely controlled to adapt to welding materials of different thicknesses or materials, avoiding the problem of excessive air volume destroying the vacuum balance or too small air volume causing low cooling efficiency, and achieving effective control of the air volume and optimization of the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 It shows a schematic diagram of the overall structure provided by an embodiment of a welding bottom plate structure according to the present invention;

[0018] Figure 2 It shows cross-sectional views from two viewing angles when the first hole segment and the second hole segment are both bar-shaped holes provided in an embodiment of the welded bottom plate structure according to the present invention;

[0019] Figure 3 It shows cross-sectional views from two viewing angles when the first hole section is a strip hole and the second hole section is a strip hole that opens and expands gradually from the top surface to the bottom surface of the bottom plate body according to an embodiment of the present invention;

[0020] Figure 4 The cross-sectional views from two viewing angles are shown when the first hole segment and the second hole segment are both strip-shaped holes that open and gradually expand from the top surface to the bottom surface of the bottom plate body according to an embodiment of the welding bottom plate structure of the present invention.

[0021] The above drawings include the following reference numerals:

[0022] 10. Bottom plate body; 11. Guide member; 110. Welding strip; 111. Mounting groove; 112. First adsorption hole; 12. Second adsorption hole; 20. Through hole; 21. First hole section; 22. Second hole section; 23. Arc-shaped transition section. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] In order to solve the problem in the prior art that the battery welding base plate is not cooled in time, resulting in the tin not solidifying after welding and affecting the yield rate, the present invention provides a welding base plate structure and a photovoltaic cell welding device having the same.

[0025] Please refer to Figures 1 to 4 As shown, one aspect of the present invention provides a welding base plate structure, including a base plate body 10, at least three groups of through holes 20 and an exhaust component; at least three groups of through holes 20 are arranged on the base plate body 10 at intervals along a first direction, each group of through holes 20 includes a plurality of through holes 20 arranged at intervals along a second direction, and each through hole 20 includes at least two hole sections connected in sequence; the exhaust component is arranged at the bottom of the base plate body 10 and is respectively connected to the at least three groups of through holes 20 to exhaust air in each through hole 20; wherein the first direction and the second direction are arranged perpendicular to each other, and the cross-sectional area of ​​the through hole 20 gradually increases along the direction from the top surface to the bottom surface of the base plate body 10.

[0026] One aspect of the technical solution applied to the present invention enables the air volume to be more evenly distributed in each through hole 20 during the exhaust cooling process, thereby ensuring that the temperature of the welding area can drop quickly and evenly. In addition, it helps the solder to solidify quickly, avoids the residual tin slag on the base plate body 10, improves the welding quality, reduces the problems such as solder joint detachment or tin bead formation caused by untimely cooling, thereby improving the product yield, and further solves the problem in the prior art that the battery welding base plate is not cooled in time, resulting in the tin not solidifying after welding, affecting the yield. At the same time, the design of at least two hole sections connected in sequence allows the air volume to be adjusted under different cooling requirements. At the connection of at least two hole sections, the air volume can be precisely controlled to adapt to welding materials of different thicknesses or materials, avoiding the problem that excessive air volume destroys the adsorption vacuum balance of the base plate body 10 or too small air volume leads to low cooling efficiency, and realizes effective control of air volume and optimization of cooling effect.

[0027] In this embodiment, each through hole 20 includes a first hole section 21 and a second hole section 22 that are sequentially connected along the direction from the top surface to the bottom surface of the base plate body 10. Through the above-mentioned setting, due to the difference in cross-sectional area between the first hole section 21 and the second hole section 22, this design can ensure that the airflow velocity from the first hole section 21 to the second hole section 22 gradually decreases, thereby making the airflow distribution on the base plate body 10 more uniform, avoiding local cooling that is too fast or too slow, improving the overall cooling uniformity, and helping the solder to solidify quickly and evenly, while avoiding tin slag residue, thereby improving the desoldering and tin slag short circuit caused by untimely cooling after welding. In addition, by adjusting the size of the first hole section 21 and the second hole section 22, the air volume distribution can be optimized according to the actual cooling demand. For example, by designing a larger cross-sectional area in the second hole section 22, the cooling contact area of ​​the airflow in the welding area can be increased, thereby improving the cooling efficiency.

[0028] In one embodiment of the present application, Figure 2 As shown, when the first hole segment 21 and the second hole segment 22 are both bar-shaped holes, the opening length of the first hole segment 21 is smaller than the opening length of the second hole segment 22 .

[0029] Optionally, when the first hole segment 21 and the second hole segment 22 are both strip-shaped holes, the opening width of the first hole segment 21 is smaller than the opening width of the second hole segment 22 .

[0030] Optionally, when the first hole segment 21 and the second hole segment 22 are both strip-shaped holes, the opening length and opening width of the first hole segment 21 are respectively smaller than the opening length and opening width of the second hole segment 22 .

[0031] Through the above settings, since the opening length or opening width of the first hole segment 21 is relatively short, it can be regarded as a preliminary guiding and accelerating section for the airflow, and the second hole segment 22 is a diffusion section with a relatively long opening length or opening width. After the airflow is accelerated through the first hole segment 21, it can diffuse more gently in the second hole segment 22, thereby effectively covering a larger welding area and improving the cooling efficiency. At the same time, by changing the opening length ratio or opening width ratio of the first hole segment 21 and the second hole segment 22, the airflow speed and flow rate from the first hole segment 21 to the second hole segment 22 can be adjusted, thereby achieving fine control of the air volume, avoiding excessive air volume affecting vacuum adsorption or too small air volume causing poor cooling effect. In addition, when the opening length of the first hole segment 21 is relatively short, the resistance of the airflow passing through can be reduced, and the noise generated when the airflow passes through the hole segment can be reduced, providing better comfort and safety for the working environment. The longer second hole section 22 can reduce the decrease in structural strength caused by the dense hole sections on the base plate body 10. At the same time, the diffusion effect of the long hole section helps to reduce the risk of base plate deformation caused by excessive local wind pressure, thereby improving the overall structural strength and stability.

[0032] It should be noted that, in the present application, the lengths of the first hole segment 21 and the second hole segment 22 can be reasonably selected according to the thickness of the bottom plate body 10 .

[0033] In another embodiment of the present application, Figure 3 As shown, when the first hole segment 21 is a strip hole and the second hole segment 22 is a strip hole whose opening gradually expands along the direction from the top surface to the bottom surface of the bottom plate body 10, the opening length of the second hole segment 22 gradually increases along the direction from the top surface to the bottom surface of the bottom plate body 10, and the maximum opening width of the first hole segment 21 is consistent with the minimum opening width of the second hole segment 22.

[0034] Optionally, when the first hole segment 21 is a strip hole and the second hole segment 22 is a strip hole that opens gradually and expands in the direction from the top surface to the bottom surface of the bottom plate body 10, the opening width of the second hole segment 22 gradually increases in the direction from the top surface to the bottom surface of the bottom plate body 10, and the maximum opening length of the first hole segment 21 is consistent with the minimum opening width of the second hole segment 22.

[0035] Through the above-mentioned setting, the opening size of the first hole segment 21 limits the initial strength of the airflow, and can accurately control the initial speed and flow of the airflow, avoiding the airflow directly impacting the welding point to cause local overcooling, reducing the generation of stress cracks, and improving the welding quality and structural stability. The gradual increase in the opening length or width of the second hole segment 22 can reduce the resistance of the airflow when passing through, reduce energy consumption, and avoid the formation of vortices in the hole segment, improve the stability and cooling effect of the airflow, and enable the airflow to cover the entire welding area more effectively, especially for large-area or complex-structured welded parts, which can accelerate the diffusion of heat, improve cooling efficiency, shorten the solder solidification time, and increase production speed. At the same time, with the size matching of the first hole segment 21 and the second hole segment 22, it is ensured that while controlling the airflow, the vacuum adsorption effect of the bottom plate will not be excessively damaged, the stable positioning of the battery cell during welding is maintained, and the welding accuracy is improved.

[0036] In another embodiment of the present application, Figure 4As shown, when the first hole segment 21 and the second hole segment 22 are both strip holes with openings gradually expanding from the top surface to the bottom surface of the bottom plate body 10, the maximum opening length of the first hole segment 21 is consistent with the minimum opening length of the second hole segment 22, and the maximum opening width of the first hole segment 21 is consistent with the minimum opening width of the second hole segment 22. Through the above settings, the opening size of the first hole segment 21 and the second hole segment 22 gradually changes from small to large. This design can ensure the smooth transition of the airflow from the first hole segment 21 to the second hole segment 22, avoiding the eddy current or turbulence generated when the airflow suddenly changes between different hole segments, thereby improving the stability of the airflow and the cooling efficiency. In addition, since the openings of the first hole segment 21 and the second hole segment 22 gradually expand, the airflow is evenly diffused in the second hole segment 22 after being accelerated by the first hole segment 21, which can cover a wider welding area, ensure the uniform distribution of the cooling effect, avoid the situation of local overcooling or insufficient cooling, and improve the quality of the weld. At the same time, the size of the opening of the first hole segment 21 limits the initial air volume, while the gradual increase in the opening of the second hole segment 22 allows the air volume to be gradually released. This design achieves precise control of the air volume from concentration to diffusion, which not only ensures sufficient air volume for cooling, but also avoids excessive air volume that destroys the vacuum adsorption balance.

[0037] In this embodiment, the opening length L1 of the first hole segment 21 satisfies: 78mm≤L1≤93mm, and the opening width W1 of the first hole segment 21 satisfies: 5mm≤W1≤12mm. In this way, by limiting the opening length and opening width range of the first hole segment 21, the initial speed of the airflow through the hole segment can be accurately controlled to meet the needs of different welding scenarios. This ensures that the airflow enters at an appropriate speed at the beginning of welding, which not only ensures the rapid cooling of the welding point, but also avoids the adverse effects of excessive airflow on the flow state of the solder. It also helps to optimize the distribution of the airflow and ensure the uniform diffusion of the airflow in the welding area, thereby achieving uniform solidification of the solder and avoiding welding defects caused by excessively fast or slow local cooling, such as cold solder joints or insufficient solder.

[0038] In this embodiment, the opening length L2 of the second hole segment 22 satisfies: 93mm≤L1≤108mm, and the opening width W2 of the second hole segment 22 satisfies: 12mm≤W2≤19mm. In this way, by limiting the opening length and opening width range of the second hole segment 22, the requirement that the size of the second hole segment 22 is larger than the size of the first hole segment 21 in different welding scenarios is met. After the airflow is initially guided and accelerated by the first hole segment 21, it can diffuse to a wider cross-sectional area in the second hole segment 22, thereby covering a wider welding area, ensuring that the entire welding surface is evenly and effectively cooled, and improving the welding quality. In addition, the larger opening size allows more airflow to pass through, accelerates the cooling process of the solder joint, and shortens the solidification time of the solder after welding, which directly improves production efficiency, shortens the waiting time after each battery cell is welded, and is conducive to the optimization of continuous production and automated processes.

[0039] Specifically, the exhaust component includes at least two exhaust ducts and an exhaust fan; each exhaust duct has a plurality of exhaust ports, and the plurality of exhaust ports are respectively connected to parts of at least three groups of through holes 20, and at least one exhaust port can be selectively connected to the through hole 20; the exhaust fan is respectively connected to at least two exhaust ducts to exhaust air in each through hole 20. The above arrangement can accurately control the exhaust volume of each welding area through the selective connection of multiple exhaust ports with different groups of through holes 20, thereby realizing fine adjustment of the cooling rate. Compared with the single air volume control, it is more flexible and can be adjusted according to the welding material, process parameters or the specific position and size of the battery cell to ensure that the cooling process is both efficient and balanced. In addition, two or more exhaust ducts are connected to the exhaust fan, which can provide higher wind pressure and air volume, accelerate heat exchange, and improve cooling efficiency. Especially for large-area or high-power welding operations, the time for solder solidification can be more significantly shortened and the production speed can be increased.

[0040] Specifically, at least two guide members 11 are provided at intervals along the first direction on the base plate body 10, and each guide rod is provided at intervals along the second direction with a plurality of mounting grooves 111 for accommodating the welding strip 110, and some through holes 20 are correspondingly located between two adjacent mounting grooves 111 along the second direction, and two adjacent groups of through holes 20 are respectively correspondingly located on opposite sides of a guide member 11. Among them, the width of each through hole 20 is less than the spacing between two adjacent main grids of the battery, and the length of each through hole 20 is less than the distance between the head and tail PAD of the battery, and the spacing between the edge of each through hole 20 and the mounting groove 111 is less than or equal to 1mm. In this way, the combination of the guide member 11 and the mounting groove 111 provides a precise guiding path for the welding strip 110, ensuring that the welding strip 110 can accurately align with the main grid on the battery cell and perform welding during the welding process, thereby improving the welding accuracy and consistency; and effectively stabilizes the position of the battery cell on the welding base plate, reducing the displacement of the battery cell during welding, especially under high air volume cooling conditions, the guide member 11 plays a fixing role, preventing the battery cell from moving unnecessarily due to the influence of airflow. At the same time, the setting of the guide member 11 helps to optimize the distribution of the cooling airflow, ensure that the airflow can evenly cover the solder strip 110, accelerate the solidification of the solder, and avoid the cooling airflow directly impacting the surface of the battery cell, reducing welding defects caused by uneven cooling; and help to improve the degree of automation of the welding line, reduce the preparation time before welding and the work intensity of the operators, thereby improving production efficiency.

[0041] In this embodiment, each guide member 11 is provided with a plurality of first adsorption holes 112 at intervals along its extension direction, and the first adsorption holes 112 are located between two adjacent mounting grooves 111, so as to be adsorbed on the battery cell when welding the battery cell. In this way, it is helpful to stabilize the position of the battery cell during the welding process, prevent the battery cell from moving under the action of heat or wind, and ensure the accuracy and quality of welding. Through the adsorption effect, even if wind force is applied during the cooling process, the precise alignment between the battery cell and the welding strip 110 can be maintained. At the same time, the plurality of first adsorption holes 112 are evenly distributed on the guide member 11, which can ensure the uniform adsorption of the battery cell in the welding area, avoid the problem of inconsistent welding caused by insufficient local adsorption force, and ensure that each welding point is subjected to the same cooling effect, thereby improving the consistency and reliability of welding.

[0042] In this embodiment, a plurality of second adsorption holes 12 are provided on the base plate body 10 for adsorption on the battery cell when welding the battery cell. Similarly, the second adsorption holes 12 can provide additional positioning support to ensure the stability and precise position of the battery cell during the welding process. Through the adsorption effect, the battery cell is firmly fixed to the base plate, and even if it is affected by thermal expansion and contraction, wind or other external forces during the welding process, it can maintain its position unchanged, thereby improving the accuracy and consistency of the welding point. Especially in the exhaust cooling link, the shaking of the battery cell caused by airflow is avoided, ensuring that the contact between the welding ribbon 110 and the battery cell is more stable, and the solder solidifies evenly, thereby improving the welding quality and reducing solder joint defects.

[0043] In this embodiment, an arc-shaped transition section 23 is provided at the opening edge of the through hole 20 located on the top surface of the base plate body 10. In this way, the provision of the arc-shaped transition section 23 can significantly reduce the stress concentration phenomenon at the opening edge of the through hole 20. During the welding process, stress will be generated between the battery cell and the base plate due to thermal expansion and contraction or mechanical force. The arc-shaped edge can better disperse these stresses, prevent fatigue or cracks in the material at the edge of the through hole 20, and ensure the integrity of the base plate and the battery cell. It also helps to improve the distribution of airflow during cooling, so that the airflow generated by the exhaust component passes through the through hole 20 more smoothly, reducing the turbulence and resistance of the airflow at the edge, and improving the cooling efficiency. At the same time, during the welding process, the arc-shaped transition section 23 can reduce the risk of tin slag splashing, facilitate the tin slag to enter the through hole 20 from the edge of the through hole 20, and help to clean the tin slag.

[0044] According to another aspect of the present invention, a photovoltaic cell welding device is provided, comprising the welding base plate structure mentioned above.

[0045] The technical solution applied to another aspect of the present invention, due to the adoption of the welding base plate structure of the present invention, the equipment can more effectively realize the rapid solidification of solder, reduce welding defects caused by insufficient cooling, such as poor solder joints, cold solder joints or excessive solder, and thus significantly improve the consistency of welding and the yield of finished products.

[0046] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0047] The welding base plate structure includes a base plate body 10, at least three groups of through holes 20 and an exhaust component; at least three groups of through holes 20 are arranged on the base plate body 10 at intervals along the first direction, each group of through holes 20 includes a plurality of through holes 20 arranged at intervals along the second direction, and each through hole 20 includes at least two hole segments connected in sequence; the exhaust component is arranged at the bottom of the base plate body 10 and is connected to the at least three groups of through holes 20 respectively, so as to exhaust air in each through hole 20; wherein the first direction and the second direction are arranged perpendicular to each other, and the cross-sectional area of ​​the through hole 20 gradually increases in the direction from the top surface to the bottom surface of the base plate body 10. In this way, during the exhaust cooling process, the air volume can be more evenly distributed in each through hole 20, thereby ensuring that the temperature of the welding area can be quickly and evenly reduced. In addition, it helps the solder to solidify quickly, avoids residual tin slag on the base plate body 10, improves the welding quality, and reduces problems such as solder joint detachment or tin bead formation due to untimely cooling, thereby improving the product yield rate, and further solves the problem in the prior art that the battery welding base plate is not cooled in time, resulting in the tin not solidifying after welding, affecting the yield rate. At the same time, the design of at least two hole sections connected in sequence allows the air volume to be adjusted under different cooling requirements. At the connection of at least two hole sections, the air volume can be precisely controlled to adapt to welding materials of different thicknesses or materials, avoiding the problem of excessive air volume destroying the vacuum balance or too small air volume causing low cooling efficiency, and achieving effective control of the air volume and optimization of the cooling effect.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0049] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0050] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0051] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0052] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A welded bottom plate structure, characterized in that: include: Bottom plate body (10); At least three groups of through holes (20) are arranged on the bottom plate body (10) at intervals along a first direction, each group of through holes (20) comprises a plurality of through holes (20) arranged at intervals along a second direction, and each through hole (20) comprises at least two hole segments that are connected in sequence; An air extraction component is arranged at the bottom of the base plate body (10) and is respectively connected to the at least three groups of through holes (20) so as to extract air from each of the through holes (20); The first direction and the second direction are arranged perpendicular to each other, and the cross-sectional area of ​​the through hole (20) gradually increases along the direction from the top surface to the bottom surface of the base plate body (10).

2. The welded bottom plate structure according to claim 1, characterized in that: Each of the through holes (20) comprises a first hole section (21) and a second hole section (22) which are sequentially connected along a direction from the top surface to the bottom surface of the bottom plate body (10).

3. The welded bottom plate structure according to claim 2, characterized in that: When the first hole segment (21) and the second hole segment (22) are both strip-shaped holes; the opening length of the first hole segment (21) is smaller than the opening length of the second hole segment (22); or, The opening width of the first hole segment (21) is smaller than the opening width of the second hole segment (22); or, The opening length and opening width of the first hole section (21) are respectively smaller than the opening length and opening width of the second hole section (22).

4. The welded bottom plate structure according to claim 2, characterized in that: When the first hole segment (21) is a strip-shaped hole, and the second hole segment (22) is a strip-shaped hole whose opening gradually expands along the direction from the top surface to the bottom surface of the bottom plate body (10); the opening length of the second hole segment (22) gradually increases along the direction from the top surface to the bottom surface of the bottom plate body (10), and the maximum opening width of the first hole segment (21) is consistent with the minimum opening width of the second hole segment (22); or, The opening width of the second hole section (22) gradually increases in the direction from the top surface to the bottom surface of the bottom plate body (10), and the maximum opening length of the first hole section (21) is consistent with the minimum opening width of the second hole section (22).

5. The welded bottom plate structure according to claim 2, characterized in that: When the first hole segment (21) and the second hole segment (22) are both strip-shaped holes that open and gradually expand in the direction from the top surface to the bottom surface of the bottom plate body (10), the maximum opening length of the first hole segment (21) is consistent with the minimum opening length of the second hole segment (22), and the maximum opening width of the first hole segment (21) is consistent with the minimum opening width of the second hole segment (22).

6. The welded floor structure according to any one of claims 3 to 5, characterized in that: The opening length L1 of the first hole section (21) satisfies: 78 mm ≤ L1 ≤ 93 mm, and the opening width W1 of the first hole section (21) satisfies: 5 mm ≤ W1 ≤ 12 mm.

7. The welded floor structure according to any one of claims 3 to 5, characterized in that: The opening length L2 of the second hole section (22) satisfies: 93mm≤L1≤108mm, and the opening width W2 of the second hole section (22) satisfies: 12mm≤W2≤19mm.

8. The welded bottom plate structure according to claim 1, characterized in that: The air extraction component comprises: At least two air extraction ducts, each of the air extraction ducts having a plurality of air extraction ports, the plurality of air extraction ports correspondingly communicating with parts of the at least three groups of through holes (20), and at least one of the air extraction ports selectively correspondingly communicating with the through hole (20); The exhaust fans are respectively connected to the at least two exhaust ducts to exhaust air from each of the through holes (20).

9. The welded bottom plate structure according to claim 1, characterized in that: At least two guide members (11) are provided on the base plate body (10) at intervals along the first direction, each guide member (11) is provided with a plurality of installation grooves (111) for accommodating welding strips (110) at intervals along the second direction, and the through hole (20) is correspondingly located between two adjacent installation grooves (111) along the second direction.

10. A photovoltaic cell welding device, characterized in that: A welded base plate structure comprising any one of claims 1 to 9.

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