Welding platform for photovoltaic cell strings

Abstract

The application belongs to the technical field of photovoltaic cell string welding equipment, and specifically discloses a welding platform for a photovoltaic cell string, which comprises a platform body and a receiving unit arranged on the platform body. The top of the receiving unit is sequentially provided with a plurality of upwardly convex receiving curved surfaces in the horizontal direction. The receiving curved surfaces are used for one-to-one receiving of cell pieces of the cell string. Each receiving curved surface has a first end in the length direction of the cell string and a second end opposite to the first end. The first end is lower than the second end. The first end and the second end of adjacent two receiving curved surfaces correspond to each other. The first end and the second end correspondingly form a step with an inclined end surface. The end surface of each step is inclined upwardly to the corresponding first end. The welding platform for the photovoltaic cell string can realize negative interval welding of the end portions of adjacent two cell pieces, ensure stable and accurate welding of the cell string, improve the efficiency and product yield, and reduce the cost.

Description

Technical Field

[0001] This application relates to photovoltaic cell string welding equipment, specifically to a welding platform for photovoltaic cell strings. Background Technology

[0002] Currently, for back-contact photovoltaic (PV) modules, all electrodes of the PV cells are located on the back side. Solder ribbons are welded to the cells using infrared or thermal contact processes. The solder ribbons are sequentially welded to multiple cells to form a PV string. To increase density, adjacent cells are stacked vertically at the ends to form a negative-pitch connection. However, when performing single-sided welding on the back of the cells at a certain temperature, the difference in thermal expansion coefficients between the solder ribbon and the cell (silicon wafer) can easily lead to localized stress concentration on the back side after welding, causing severe warping on both sides of the cell and affecting the yield of the PV module. Furthermore, existing welding platforms typically cannot achieve negative-pitch welding of the ends of adjacent cells. Utility Model Content

[0003] The purpose of this application is to propose a welding platform for photovoltaic cell strings, which can realize negative spacing welding of the end stacks of two adjacent cells, ensuring stable and precise welding of the cell strings, improving efficiency and product yield, and reducing costs.

[0004] To solve at least one of the above-mentioned technical problems, the technical solution of this application is as follows:

[0005] According to an embodiment of this application, a welding platform for photovoltaic cell strings includes: a platform body; and a receiving unit disposed on the platform body. The top of the receiving unit has a plurality of upwardly protruding receiving curved surfaces arranged sequentially along the horizontal direction. The receiving curved surfaces are used to receive the cells of the cell string one by one. One end of each receiving curved surface along the length direction of the cell string is a first end and the other end is a second end. The first end is lower than the second end. The first end and the second end of two adjacent receiving curved surfaces correspond to each other. A step with an inclined end face is formed between the corresponding first end and the second end. The end face of each step is inclined upward towards the corresponding first end.

[0006] In one possible implementation of the above embodiments, the receiving unit is detachably connected to the platform body. The receiving unit is formed by detachably splicing multiple receiving modules in sequence. Each receiving module is detachably connected to the platform body and its top forms a receiving curved surface.

[0007] In one possible implementation of the above embodiments, each receiving module is detachably connected to the platform body via a slot structure or a magnetic structure.

[0008] In one possible implementation of the above embodiments, each receiving surface is provided with an adsorption hole for adsorbing the battery cell, and each receiving module is provided with a cavity communicating with the adsorption hole; an air nozzle communicating with the cavity is provided on one side of each receiving module.

[0009] In one possible implementation of the above embodiment, each adsorption pore is a waist-shaped pore.

[0010] In one possible implementation of the above embodiments, each receiving module is provided with a heating device, which is used to heat the receiving module to preheat the battery cells placed on the receiving module, or to heat the receiving module so that the battery cells placed on the receiving module are welded to the solder strip.

[0011] In one possible implementation of the above embodiments, each receiving module includes multiple support members and multiple adsorption members. The multiple support members and multiple adsorption members are arranged alternately and connected sequentially along the length direction of the battery string. The tops of the multiple support members and the multiple adsorption members form a receiving curved surface. Each adsorption member is provided with an adsorption hole, a cavity and an air nozzle. Each support member is provided with a heating device.

[0012] In one possible implementation of the above embodiment, the middle part, the first end and the second end of the receiving surface each correspond to an adsorption element, and each adsorption element has multiple adsorption holes.

[0013] In one possible implementation of the above embodiments, each receiving surface includes a first surface, a second surface, and a third surface connected sequentially along the length of the battery string. The end of the first surface away from the second surface is the first end, and the end of the third surface away from the second surface is the second end. The curvature of the first surface is greater than the curvature of the second surface, and the curvature of the second surface is greater than the curvature of the third surface.

[0014] In one possible implementation of the above embodiments, the first surface is a guide arc surface, the second surface is a transition arc surface, and the third surface is a guide plane.

[0015] In one possible implementation of the above embodiments, a flexible protective layer is provided on the surface of each receiving surface.

[0016] In one possible implementation of the above embodiments, both the platform body and the receiving unit are made of metal materials.

[0017] The above-mentioned technical solution of this application has at least one of the following beneficial effects:

[0018] According to the welding platform for photovoltaic cell strings of this application, a receiving unit is set on the platform body. Multiple upward-protruding receiving surfaces are sequentially arranged on the top of the receiving unit along the horizontal direction. Each receiving surface has one end along the length of the cell string as a first end and the other end as a second end, with the first end lower than the second end. The first and second ends of adjacent receiving surfaces correspond to each other, forming a step with an inclined end face between the corresponding first and second ends. The end face of each step slopes upwards towards its corresponding first end. The cell string to be welded is placed on the receiving unit, and the cell cells of the cell string are placed one-to-one on each receiving surface. Under the action of the inclined end face step between adjacent receiving surfaces, the ends of adjacent cell cells form a negative gap corresponding to each other vertically, and the first end of the corresponding cell cell can be positioned against the inclined surface of the step, thereby ensuring a stable string connection of the cell string. Therefore, the welding platform for photovoltaic cell strings of this application can realize negative spacing welding of the end stacks of two adjacent cells. The first end of the corresponding cell can be positioned against the inclined surface of the step. The curved surface can also prevent local stress concentration after the cell is welded to the welding strip, which would cause warping on both sides of the cell. This ensures stable and accurate welding of the cell string, improves efficiency and product yield, and reduces costs.

[0019] In addition, unless otherwise specified in the technical solution of this application, the technical solution can be implemented by conventional means in the field. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a welding platform for photovoltaic cell strings according to one embodiment of this application;

[0022] Figure 2 This is a partial structural schematic diagram of a receiving unit according to one embodiment of this application;

[0023] Figure 3 This is a schematic diagram of the structure of the receiving module according to one embodiment of this application;

[0024] Figure 4 This is a top view of an adsorption element according to one embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the structure of a photovoltaic cell string according to one embodiment of this application.

[0026] Explanation of the labels in the attached drawings:

[0027] Platform body 100;

[0028] Receiving unit 200; receiving curved surface 210; first end 211; second end 212; step 213; first curved surface 214; second curved surface 215; third curved surface 216; receiving module 220; first magnetic suction component 221; suction hole 222; air nozzle 223; heating device 224; support component 225; suction component 226; flexible protective layer 230;

[0029] 300 solar cells;

[0030] 400mm welding strip. Detailed Implementation

[0031] 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 understood that the specific embodiments described herein are only some, not all, of the embodiments of this application, and are used merely to explain this application and are not intended to limit it. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0032] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," "outer," "both ends," "both sides," "bottom," and "top," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the elements referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," "upper-level," "lower-level," "main," and "secondary," etc., are used for descriptive purposes only and can be simply used to more clearly distinguish different components, and should not be construed as indicating or implying relative importance.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] See Figures 1-4 The diagram schematically illustrates a welding platform for photovoltaic cell strings according to an embodiment of this application, primarily used for welding and connecting photovoltaic cell strings. The welding platform for photovoltaic cell strings of this application may include: a platform body 100 and a receiving unit 200.

[0035] The receiving unit 200 is disposed on the platform body 100. The top of the receiving unit 200 is provided with a plurality of upwardly protruding receiving curved surfaces 210 in sequence along the horizontal direction. The receiving curved surfaces 210 are used to receive the battery cells 300 of the battery string one by one. One end of each receiving curved surface 210 along the length direction of the battery string is a first end 211 and the other end is a second end 212. The first end 211 is lower than the second end 212. The first end 211 and the second end 212 of two adjacent receiving curved surfaces 210 correspond to each other. A step 213 with an inclined end face is formed between the corresponding first end 211 and the second end 212. The end face of each step 213 is inclined upward towards the corresponding first end 211.

[0036] refer to Figure 5 As shown, a photovoltaic cell string includes multiple solar cells 300 arranged in sequence and solder ribbons 400 that mate with the back of each solar cell 300. Solder paste or other soldering materials are applied to the back of each solar cell 300 and the solder ribbons 400. When the cell string is soldered together, refer to... Figures 1-3 As shown, the battery string to be welded is first placed on the receiving unit 200. The battery cells 300 of the battery string are then placed one-to-one on each receiving curved surface 210. The receiving curved surface 210 can better fit the battery cells 300. Under the influence of its own gravity, the sides of the battery cells 300 placed on the receiving curved surface 210 will also experience a certain downward force, and the sides or ends of the battery cells 300 will adhere to the receiving curved surface 210. This prevents localized stress concentration after the battery cells 300 are welded to the welding ribbon 400, thus preventing warping of the sides of the battery cells 300. Under the action of the step 213, which is an inclined surface between two adjacent receiving curved surfaces 210, the ends of two adjacent battery cells 300 form a negative gap corresponding to the top and bottom (that is, the ends of two adjacent battery cells 300 overlap). The first end 211 of the corresponding battery cell 300 can be positioned against the inclined surface of the step 213. The welding connection between the welding strip 400 and each battery cell 300 can be achieved by heating the receiving unit 200, or by using an external heat source or superimposed external heat sources, thereby achieving the series welding connection of the battery string, and the ends of two adjacent battery cells 300 are connected with a negative gap between the top and bottom stacks.

[0037] Therefore, the welding platform for photovoltaic cell strings in this application has a receiving curved surface 210 that is an asymmetrical convex arc surface with the first end 211 and the second end 212. This enables negative spacing welding of the end stacks of two adjacent cell sheets 300. The first end 211 of the cell sheet 300 can be positioned against the inclined surface of the step 213. The receiving curved surface 210 can also prevent local stress concentration after the cell sheet 300 is welded to the welding strip 400, which could lead to warping of the two sides of the cell sheet 300. This ensures stable and accurate welding of the cell string, improves efficiency and product yield, and reduces costs.

[0038] In some embodiments, reference Figures 1-3 As shown, the receiving unit 200 is detachably connected to the platform body 100, such as through magnetic adsorption or a slot structure. This facilitates replacement and adjustment based on actual conditions, allowing for the replacement of different receiving units 200 according to different sizes and types of battery strings. This makes operation more convenient, improves efficiency and the applicability of the welding platform, and broadens its application range.

[0039] Further, refer to Figures 1-3 As shown, the receiving unit 200 is formed by detachably assembling multiple receiving modules 220 in sequence. Each receiving module 220 is detachably connected to the platform body 100, and its top forms a receiving curved surface 210. Each receiving module 220 and the platform body 100 can be detachably connected via a slot structure or a magnetic structure. For example, each receiving module 220 has a first magnetic suction member 221 at its bottom, and the platform body 100 has a second magnetic suction member (not shown in the figure) magnetically connected to each first magnetic suction member 221. In other words, the receiving unit 200 adopts a split design, which facilitates the replacement and adjustment of the number of receiving modules 220 of the receiving unit 200 according to the length of the battery string, realizing modular assembly, adapting to the string welding connection requirements of battery strings of different lengths, and improving the applicability of the welding platform.

[0040] In some embodiments, reference Figures 3-4 As shown, each receiving surface 210 is provided with an adsorption hole 222 for holding the battery cell 300, and each receiving module 220 is provided with a cavity (not shown in the figure) communicating with the adsorption hole 222. Each receiving module 220 has an air nozzle 223 communicating with the cavity on one side, which is used to connect to a corresponding vacuum pump or other vacuuming device. Therefore, by adsorbing the battery cell 300 placed on the receiving surface 210 through the adsorption hole 222, not only can the battery cell 300 be prevented from shaking, ensuring better welding operation, but also deformation and warping of the battery cell 300 during the welding process can be prevented, resulting in greater stability and reliability.

[0041] Further, refer to Figure 4As shown, each adsorption hole 222 is an oblong hole. Each adsorption element 226 can have multiple oblong adsorption holes 222 arranged side-by-side. The length direction of the adsorption holes 222 can be consistent with the length direction of the battery string, and the arrangement direction of the multiple adsorption holes 222 on each adsorption element 226 is perpendicular to the length direction of the adsorption holes 222. This ensures more stable adsorption and adhesion of the battery cell 300 to the receiving curved surface 210.

[0042] In some embodiments, reference Figures 2-3 As shown, each receiving module 220 is equipped with a heating device 224. The heating device 224 can be electric heating or other suitable heating methods, and the heating temperature of the heating device 224 can be 80℃~280℃. The heating device 224 can be used to heat the receiving module 220, preheat the battery cell 300 placed on the receiving module 220, and then complete the welding connection between the battery cell 300 and the welding ribbon 400 by superimposing an external heat source (such as an infrared heat source). The external heat source can be an infrared heat source or other suitable heat source. The heating device 224 can also be used to heat the receiving module 220, directly enabling the battery cell 300 placed on the receiving module 220 to be welded to the welding ribbon 400. Thus, different welding requirements can be met, and the preheating of the battery cell 300 by the heating device 224 can also ensure that the battery cell 300 fits better on the receiving curved surface 210 and better prevent the warping of the two sides of the battery cell 300 after welding.

[0043] In some embodiments, reference Figures 2-4 As shown, each receiving module 220 includes multiple support members 225 and multiple adsorption members 226. The support members 225 and adsorption members 226 are alternately arranged and connected sequentially along the length of the battery string. The tops of the support members 225 and adsorption members 226 form a receiving curved surface 210. Each adsorption member 226 is provided with an adsorption hole 222, a cavity, and an air nozzle 223. Each support member 225 is provided with a heating device 224. The support members 225 and adsorption members 226 can be integrally formed or detachably connected sequentially. Each adsorption member 226 and each support member 225 can also be detachably connected to the platform body 100 via a magnetic structure or a slot structure. This makes processing and manufacturing more convenient, improves efficiency, and reduces costs.

[0044] Further, refer to Figures 2-4As shown, the middle part, the first end 211 and the second end 212 of the receiving curved surface 210 each correspond to an adsorption member 226, and each adsorption member 226 has multiple adsorption holes 222. For example, each receiving module 220 may include three adsorption members 226 and two support members 225. Each adsorption member 226 is provided with three waist-shaped adsorption holes 222, and each support member 225 is provided with a heating device 224. The three adsorption members 226 are distributed in the middle part, the first end 211 and the second end 212 of the receiving curved surface 210, and a support member 225 is respectively provided between two adsorption members 226. The three adsorption members 226 and the two support members 225 can be detachably connected to the platform body 100 through magnetic structures. Each support member 225 and its adjacent adsorption member 226 can also be positioned by a positioning structure to ensure a more stable overall structure. Therefore, the middle part, the first end 211 and the second end 212 of the receiving surface 210 are respectively equipped with adsorption members 226, which can ensure that the battery cell 300 is more stably adsorbed and attached to the receiving surface 210, and can also effectively avoid the edge warping of the battery cell 300. By using the adsorption members 226 to separate the two adjacent support members 225, concentrated heating and energy waste can be avoided.

[0045] In some embodiments, reference Figures 2-3 As shown, each receiving surface 210 includes a first surface 214, a second surface 215, and a third surface 216 connected sequentially along the length of the battery string. The end of the first surface 214 away from the second surface 215 is designated as the first end 211, and the end of the third surface 216 away from the second surface 215 is designated as the second end 212. The curvature of the first surface 214 is greater than that of the second surface 215, and the curvature of the second surface 215 is greater than that of the third surface 216. The first surface 214 can be a guide arc surface, the second surface 215 can be a transition arc surface, and the third surface 216 can be a guide plane. The radius of curvature of the first surface 214 can be 250-500 mm. In other words, the curvature of the receiving surface 210 decreases sequentially from its first surface 214 to its third surface 216, making the first end 211 of the receiving surface 210 lower than its second end 212. The receiving surface 210 is an asymmetrical convex arc surface. The first ends 211 and second ends 212 of two adjacent receiving surfaces 210 correspond to each other and form a step 213 with an inclined end face. The end face of each step 213 is inclined upward towards its corresponding first end 211. This not only enables the negative spacing connection of the ends of two adjacent battery cells 300, but also ensures that the battery cell 300 is attached to the receiving surface 210. The corresponding battery cell 300 can also be positioned by the inclined surface of the step 213, making it more stable and reliable.

[0046] In some embodiments, reference Figures 2-3As shown, each receiving curved surface 210 has a flexible protective layer 230 on its surface. The flexible protective layer 230 can be made of carbon fiber reinforced silicone, which can achieve high temperature resistance while ensuring flexible contact. This prevents damage to the solar cell 300, resulting in higher safety and reliability. Those skilled in the art will understand that the flexible protective layer 230 can also be made of other suitable materials available in the prior art.

[0047] In some embodiments, both the platform body 100 and the receiving unit 200 are made of metallic materials. This results in higher structural strength and a longer service life. Alternatively, the platform body 100 and the receiving unit 200 can also be made of other suitable materials available in the prior art.

[0048] Based on the various embodiments of this application described above, in the absence of explicit denial or conflict, the technical features of one embodiment may be advantageously combined with one or more other embodiments.

[0049] The above descriptions are merely some embodiments of this application, used only to illustrate the technical solutions of this application, and not to limit it. It should be understood that those skilled in the art can make improvements or substitutions based on the above descriptions without departing from the inventive concept of this application, and all such improvements and substitutions should fall within the protection scope of this application. In this case, all details can be replaced with equivalent elements, and materials, shapes, and sizes can also be arbitrary.

Claims

1. A welding platform for photovoltaic cell strings, characterized in that, include: Platform body; A receiving unit is disposed on the platform body. The top of the receiving unit has a plurality of upwardly protruding receiving curved surfaces arranged in sequence along the horizontal direction. The receiving curved surfaces are used to receive the battery cells of the battery string one by one. One end of each receiving curved surface along the length direction of the battery string is a first end and the other end is a second end. The first end is lower than the second end. The first end and the second end of two adjacent receiving curved surfaces correspond to each other. A step with an inclined end face is formed between the corresponding first end and the second end. The end face of each step is inclined upward towards the corresponding first end.

2. The welding platform for photovoltaic cell strings according to claim 1, characterized in that, The receiving unit is detachably connected to the platform body. The receiving unit is formed by detachably splicing multiple receiving modules in sequence. Each receiving module is detachably connected to the platform body and its top forms a receiving curved surface.

3. The welding platform for photovoltaic cell strings according to claim 2, characterized in that, Each of the receiving modules is detachably connected to the platform body via a magnetic structure or a slot structure.

4. The welding platform for photovoltaic cell strings according to claim 2, characterized in that, Each of the receiving curved surfaces is provided with an adsorption hole for adsorbing the battery cell, and each receiving module is provided with a cavity communicating with the adsorption hole; Each of the receiving modules is provided with an air nozzle on one side that communicates with the cavity; and / or, Each of the adsorption pores is an oblong pore.

5. The welding platform for photovoltaic cell strings according to claim 4, characterized in that, Each of the receiving modules is provided with a heating device, which is used to heat the receiving module to preheat the battery cell placed on the receiving module, or the heating device is used to heat the receiving module to complete the welding of the battery cell placed on the receiving module to the welding strip.

6. The welding platform for photovoltaic cell strings according to claim 5, characterized in that, Each receiving module includes multiple support members and multiple adsorption members. The multiple support members and multiple adsorption members are arranged alternately and connected sequentially along the length direction of the battery string. The tops of the multiple support members and multiple adsorption members form a receiving curved surface. Each adsorption member is provided with an adsorption hole, a cavity and an air nozzle. Each support member is provided with a heating device.

7. The welding platform for photovoltaic cell strings according to claim 6, characterized in that, The middle part, the first end and the second end of the receiving curved surface each correspond to an adsorption element, and each adsorption element has multiple adsorption holes.

8. The welding platform for photovoltaic cell strings according to claim 1, characterized in that, Each of the receiving surfaces includes a first surface, a second surface, and a third surface connected sequentially along the length of the battery string. The end of the first surface away from the second surface is the first end, and the end of the third surface away from the second surface is the second end. The curvature of the first surface is greater than the curvature of the second surface, and the curvature of the second surface is greater than the curvature of the third surface.

9. The welding platform for photovoltaic cell strings according to claim 8, characterized in that, The first curved surface is a guide arc surface, the second curved surface is a transition arc surface, and the third curved surface is a guide plane.

10. The welding platform for photovoltaic cell strings according to any one of claims 1 to 9, characterized in that, Each of the aforementioned receiving surfaces is provided with a flexible protective layer; Both the platform body and the receiving unit are made of metal.

Images