Photovoltaic module without main grid and preparation method thereof
By setting grooves on the main gateless cell to accommodate welded parts and conductive parts, the problem of welded parts overflow during welding is solved, and the aesthetics of the main gateless photovoltaic module is improved.
Patent Information
- Application Number
- CN202510512132.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2025-07-18
AI Technical Summary
In the prior art, molten welded parts during welding will overflow, resulting in residual welding traces on the surface of the main gate photovoltaic module, affecting the aesthetics.
Set a groove to accommodate welds and conductive parts on the main gateless battery cell, and weld the conductive parts to the battery cell together through the welding parts. After the welding is completed, the surface of the weld is flush with or lower than the groove notch to prevent the weld from overflowing.
It effectively avoids the residue of welding traces and improves the aesthetics of the main gate photovoltaic module.
Smart Images
Figure CN120343984A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of photovoltaic devices, and more particularly, to a main-grid-free photovoltaic module and a method for manufacturing the same. Background Art
[0002] With the continuous progress of photovoltaic technology, main-grid-free solar cells adopt 0BB (Zero Busbar) technology. Through special design and optimization, the current is evenly distributed on the surface of the solar cell, reducing the shading area and improving the photoelectric conversion efficiency.
[0003] However, in the prior art, during the welding process, the molten welding parts will overflow, resulting in welding marks remaining on the surface of the solar cell, which affects the aesthetics of the photovoltaic module. Summary of the Invention
[0004] An object of the present invention is to provide a main-grid-free photovoltaic module and a method for manufacturing the same, which can avoid the overflow of molten welding parts during the welding process and improve the aesthetics of welding.
[0005] The embodiments of the present invention may be implemented as follows:
[0006] In a first aspect, the present invention provides a main-grid-free photovoltaic module, including:
[0007] A main-grid-free solar cell, which is provided with a groove;
[0008] A welding part, which is accommodated in the groove;
[0009] A conductive part, which is located in the groove and is in contact with the welding part; the conductive part is welded to the main-grid-free solar cell through the welding part;
[0010] Wherein, the welding part fills the gap between the groove and the conductive part, and the surface of the welding part is flush with or lower than the notch of the groove.
[0011] In an alternative embodiment, a part of the periphery of the conductive part is accommodated in the groove, and the other part of the periphery is exposed outside the groove;
[0012] Wherein, a plating layer is connected to the periphery of the conductive part exposed outside the groove.
[0013] In an alternative embodiment, the color of the plating layer is the same as that of the main-grid-free solar cell.
[0014] In an alternative embodiment, the number of the grooves, the welding parts and the conductive parts is multiple, and the multiple grooves, the multiple welding parts and the multiple conductive parts correspond to each other one by one. Each conductive part is accommodated in the corresponding groove, and each conductive part is welded to the main-grid-free solar cell through the corresponding welding part.
[0015] In an alternative embodiment, the welding member includes solder powder, and the solder powder fills at least a part of the space of the groove.
[0016] In a second aspect, the present invention provides a method for manufacturing a main-gridless photovoltaic module as described in any one of the foregoing embodiments, including:
[0017] Placing the welding member in the groove of the main-gridless cell, and spacing the surface of the welding member from the notch of the groove;
[0018] Placing the conductive member into the groove so that the conductive member contacts the welding member;
[0019] Welding the main-gridless cell and the conductive member through the welding member.
[0020] In an alternative embodiment, before the step of placing the welding member in the groove of the main-gridless cell, it further includes:
[0021] Selecting a material with the same color as the main-gridless cell and electroplating it on a part of the periphery of the conductive member to form a coating.
[0022] In an alternative embodiment, the step of placing the conductive member into the groove so that the conductive member contacts the welding member includes:
[0023] Contacting another part of the periphery of the conductive member with the welding member; and exposing a part of the periphery connected with the coating outside the groove.
[0024] In an alternative embodiment, the step of placing the welding member in the groove of the main-gridless cell includes:
[0025] Laying solder powder into the groove so that the solder powder fills half of the space of the groove.
[0026] In an alternative embodiment, the step of welding the main-gridless cell and the conductive member through the welding member includes:
[0027] Heating and laminating the main-gridless cell, the welding member, and the conductive member;
[0028] After the lamination is completed, cooling the main-gridless cell, the welding member, and the conductive member.
[0029] The beneficial effects of the main-gridless photovoltaic module and the method for manufacturing the main-gridless photovoltaic module provided by the embodiments of the present invention include:
[0030] In this embodiment, by providing a groove on the main-gridless cell to accommodate the welding member and the conductive member, the conductive member is welded to the main-gridless cell through the welding member. After welding, the surface of the welding member is flush with or lower than the notch of the groove, thereby preventing the welding member from overflowing from the groove and avoiding welding traces remaining on the surface of the main-gridless cell, thus improving the aesthetics of the main-gridless photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.
[0032] Figure 1 It is a schematic structural diagram of the main-gridless photovoltaic module provided in this embodiment;
[0033] Figure 2 It is a schematic structural diagram of the main-gridless cell, welding part and conductive part before welding provided in this embodiment;
[0034] Figure 3 It is a schematic structural diagram of the main-gridless cell, welding part and conductive part after welding provided in this embodiment;
[0035] Figure 4 It is a schematic flowchart of the preparation method of the main-gridless photovoltaic module provided in this embodiment;
[0036] Figure 5 It is a schematic flowchart of placing the welding part provided in this embodiment;
[0037] Figure 6 It is a schematic flowchart of preparing the coating layer provided in this embodiment;
[0038] Figure 7 It is a schematic flowchart of welding the conductive part and the main-gridless cell provided in this embodiment.
[0039] Reference numerals: 100 - main-gridless photovoltaic module; 110 - main-gridless cell; 111 - groove; 120 - welding part; 130 - conductive part; 140 - coating layer. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0040] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated in the drawings here can be arranged and designed in various different configurations.
[0041] Accordingly, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.
[0042] It should be noted that: like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0043] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is habitually placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.
[0044] In addition, terms such as "first", "second", etc. are only used for differential description and cannot be understood as indicating or implying relative importance.
[0045] It should be noted that, without conflict, the features in the embodiments of the present invention can be combined with each other.
[0046] Please refer to Figures 1 - 3 , an embodiment of the present invention provides a main-gridless photovoltaic module 100, which includes a main-gridless cell 110, a welding member 120, and a conductive member 130. The main-gridless cell 110 is provided with a groove 111, and the welding member 120 is received in the groove 111. The conductive member 130 is located in the groove 111 and contacts the welding member 120. In this embodiment, the conductive member 130 and the main-gridless cell 110 are welded together through the welding member 120.
[0047] It should be noted that before welding, the welding member 120 is first placed in the groove 111, and then the conductive member 130 is placed in the groove 111 so that the conductive member 130 contacts the welding member 120; moreover, the surface of the welding member 120 is spaced from the notch of the groove 111 to reserve a certain space, that is, the welding member 120 before welding does not fill the groove 111.
[0048] Secondly, heat the main-gridless cell 110, the welding piece 120, and the conductive piece 130 to melt the welding piece 120; and press down the conductive piece 130 so that the conductive piece 130 moves towards the bottom of the groove 111, causing the molten welding piece 120 to deform under the extrusion of the conductive piece 130 and the main-gridless cell 110. The molten welding piece 120 wraps around part of the periphery of the conductive piece 130, thereby increasing the contact area between the welding piece 120 and the conductive piece 130, enabling the conductive piece 130 to be stably welded to the main-gridless conductive sheet.
[0049] Subsequently, cool the main-gridless cell 110, the welding piece 120, and the conductive piece 130. After cooling, the welding piece 120 solidifies again. The solidified welding piece 120 fills the gap between the groove 111 and the conductive piece 130, and the surface of the welding piece 120 is flush with the notch of the groove 111 or lower than the notch of the groove 111.
[0050] It can be understood that when the conductive piece 130 is pressed down, the molten welding piece 120 will move towards the notch of the groove 111. However, due to the interval between the surface of the welding piece 120 before welding and the notch of the groove 111, a certain space is reserved for the molten welding piece 120 to move, avoiding the molten welding piece 120 from overflowing the groove 111 due to extrusion. Therefore, after welding is completed, the re-solidified welding piece 120 is still located within the groove 111, and its surface will be flush with the notch of the groove 111 or lower than the notch of the groove 111.
[0051] Thus, in this embodiment, the molten welding piece 120 will not overflow, avoiding welding marks remaining on the surface of the main-gridless cell 110, thereby improving the aesthetics of the photovoltaic module.
[0052] Specifically, the welding piece 120 in this embodiment is tin powder. Before welding, the tin powder is laid in part of the space of the groove 111 and does not fill the entire cavity of the groove 111.
[0053] During the heating of the main-gridless cell 110, the welding piece 120, and the conductive piece 130, the tin powder melts into a liquid and moves towards the notch of the groove 111 under the extrusion of the conductive piece 130 to wrap around part of the periphery of the conductive piece 130.
[0054] Cool the main-gridless cell 110, the welding piece 120, and the conductive piece 130, so that the liquid tin re-solidifies into a solid state, forming a tin solder layer to fixedly connect the conductive piece 130 and the main-gridless cell 110, thereby completing the welding. The welding piece 120 in the main-gridless photovoltaic module 100 after welding, that is, the tin solder layer, will fill the gap between the conductive piece 130 and the groove 111.
[0055] However, since the surface of the soldering layer is flush with or lower than the notch of the groove 111, even if the soldering layer fills the gap between the conductive member 130 and the groove 111, it will not overflow from the groove 111, thus avoiding the residual welding marks on the surface of the main-grid-free cell 110 and improving the aesthetics of the main-grid-free photovoltaic module 100.
[0056] Thus, it can be understood that in this embodiment, the soldering layer fills the gap between the groove 111 and the conductive member 130, and in other embodiments, the soldering layer may also fill the gap between the groove 111 and the conductive member 130. Therefore, after welding, the tin powder fills at least part of the space between the conductive member 130 and the groove 111, thereby improving the aesthetics of the main-grid-free photovoltaic module 100.
[0057] Furthermore, after welding, the conductive member 130 is welded to the main-grid-free cell 110 through the welding member 120, and the conductive member 130 is located within the groove 111, such that a part of the periphery of the conductive member 130 is accommodated within the groove 111, and another part of the periphery is exposed outside the groove 111.
[0058] It should be noted that in the prior art, the conductive member 130 generally uses a steel wire, and the main-grid-free cell 110 is black, resulting in different colors of the conductive member 130 and the main-grid-free cell 110, which affects the aesthetics of the main-grid-free photovoltaic module 100.
[0059] In this embodiment, a material having the same color as the main-grid-free cell 110 is selected to be electroplated on the part of the periphery of the conductive member 130 exposed outside the groove 111, thereby forming a plating layer 140 having the same color as the main-grid-free cell 110, such that the appearance of the main-grid-free photovoltaic module 100 has only one color, thus improving the aesthetics of the main-grid-free photovoltaic module 100.
[0060] Since the color of the main-grid-free cell 110 is black, the material selected in this embodiment is a black material, and the plating layer 140 is also black. The material for forming the plating layer 140 can be a conductive material or an insulating material.
[0061] According to the above content, this embodiment has a plurality of conductive members 130, the main-grid-free cell 110 is provided with a plurality of grooves 111, each conductive member 130 is correspondingly placed in a groove 111, and each groove 111 is correspondingly provided with a welding member 120, so that each conductive member 130 is welded to the main-grid-free cell 110 through the corresponding welding member 120.
[0062] It should be noted that the multiple grooves 111 in this embodiment are arranged in parallel and at intervals. After placing the multiple conductive members 130 in the corresponding grooves 111, the multiple conductive members 130 are connected in series in sequence along the arrangement direction of the multiple grooves 111. In this embodiment, multiple grooves 111 are provided on both sides of the main-gridless cell 110, and the number of grooves 111 on both sides is equal.
[0063] Please refer to Figures 4 - 7 , based on the above content, this embodiment also provides a method for manufacturing a main-gridless photovoltaic module 100, and the steps of the method for manufacturing the main-gridless photovoltaic module 100 are as follows:
[0064] S1: Electroplate a material with the same color as the main-gridless cell 110 on a part of the periphery of the conductive member 130 to form a coating layer 140.
[0065] S2: Place the welding member 120 in the groove 111 of the main-gridless cell 110, and keep the surface of the welding member 120 spaced from the notch of the groove 111.
[0066] S3: Place the conductive member 130 into the groove 111 so that the conductive member 130 contacts the welding member 120.
[0067] S4: Weld the main-gridless cell 110 and the conductive member 130 through the welding member 120.
[0068] Among them, the specific steps of S3 include:
[0069] S31: Contact another part of the periphery of the conductive member 130 with the welding member 120; and make a part of the periphery connected with the coating layer 140 exposed outside the groove 111.
[0070] Thus, it is ensured that the coating layer 140 is located outside the groove 111, so that the main-gridless photovoltaic module 100 has a consistent color and improves the aesthetics of the main-gridless photovoltaic module 100. Moreover, contacting the periphery without the coating layer 140 with the welding member 120 can avoid the problem that the conductive member 130 cannot conduct electricity to the main-gridless cell 110 when the coating layer 140 uses an insulating material.
[0071] The specific steps of S2 and S4 in this embodiment are:
[0072] S21: Lay solder powder into the groove 111 so that the solder powder fills half of the space of the groove 111.
[0073] S41: Heat and laminate the main-gridless cell 110, the welding member 120, and the conductive member 130.
[0074] S42: After the lamination is completed, cool the main-gridless cell 110, the welding member 120, and the conductive member 130.
[0075] Thus, in this embodiment, the tin powder laid in the groove 111 is melted by heating, and half of the space of the groove 111 is reserved for the molten tin powder to flow, so as to prevent the molten tin powder from overflowing due to the extrusion of the conductive member 130 during the lamination process, avoid the residual welding marks on the surface of the main-gridless cell 110, and thus improve the aesthetic appearance of the main-gridless photovoltaic module 100.
[0076] In other embodiments, the space of the groove 111 filled with tin powder can be adjusted according to the actual volume of the conductive member 130 entering the groove 111 during the lamination process.
[0077] It should be noted that since multiple grooves 111 are provided in this embodiment to weld multiple conductive members 130, after the steps of S1 - S3 are completed, the new conductive members 130 need to be subjected to the steps of S1 - S3 together, and the conductive members 130 that have completed the steps of S1 - S3 are connected in series in sequence, and then the step of S4 is carried out to form the main-gridless photovoltaic module 100 in this embodiment.
[0078] It should also be noted that the main-gridless photovoltaic module 100 in this embodiment can be prepared manually or can be prepared automatically by machine equipment.
[0079] If it is to be prepared automatically by machine equipment, first, the signal about the color of the main-gridless cell 110 needs to be transmitted to the electroplating machine. After receiving the signal, the electroplating machine selects a material with the same color as the main-gridless cell 110 to electroplate a part of the periphery of the conductive member 130, and after the electroplating is completed, the signal is transmitted to the robotic arm.
[0080] After receiving the signal transmitted by the electroplating machine, the robotic arm first lays tin powder into the groove 111 of the main-gridless cell 110 to fill half of the space of the groove 111; then, it grabs the conductive member 130 connected with the coating layer 140 and moves it into the groove 111, making the other part of the periphery not connected with the coating layer 140 contact with the tin powder.
[0081] The electroplating machine and the robotic arm repeat the above actions. After laying tin powder in all the grooves 111 of the main-gridless cell 110 and placing the conductive members 130 connected with the coating layer 140, the robotic arm transmits a signal to the laminator and the heater to heat and laminate the main-gridless cell 110, the tin powder, and the conductive members 130.
[0082] The tin powder melts under the influence of the heater, while the conductive member 130 and the main-gridless cell 110 approach each other under the influence of the laminator and squeeze the melted liquid tin. After the lamination is completed, the laminator transmits a signal to the cooler to cool the main-gridless cell 110, the liquid tin, and the conductive member 130, causing the liquid tin to re-solidify into a tin solder layer, thereby completing the welding and forming the main-gridless photovoltaic module 100 in this embodiment.
[0083] It can be understood that in the above content, signal sensors are provided on the electroplating machine, the robotic arm, the laminating member, the heater, and the cooler to transmit and receive signals, thereby realizing automated production.
[0084] In summary, in this embodiment, a groove 111 is provided on the main-gridless cell 110 to accommodate the welding member 120 and the conductive member 130, so that the conductive member 130 is welded to the main-gridless cell 110 through the welding member 120. After the welding is completed, the surface of the welding member 120 is flush with or lower than the notch of the groove 111, thereby preventing the welding member 120 from overflowing from the groove 111 and avoiding welding traces remaining on the surface of the main-gridless cell 110, thus improving the aesthetics of the main-gridless photovoltaic module 100.
[0085] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.
Claims
1. A main-gridless photovoltaic module, characterized in that, Comprising: A main-gridless cell (110), wherein the main-gridless cell (110) is provided with a groove (111); A welding piece (120), wherein the welding piece (120) is accommodated in the groove (111); A conductive piece (130), wherein the conductive piece (130) is located in the groove (111) and contacts the welding piece (120); the conductive piece (130) is welded to the main-gridless cell (110) through the welding piece (120); Wherein, the welding piece (120) fills the gap between the groove (111) and the conductive piece (130), and the surface of the welding piece (120) is flush with or lower than the notch of the groove (111).
2. The ownerless grid photovoltaic module according to claim 1, wherein, A part of the periphery of the conductive piece (130) is accommodated in the groove (111), and another part of the periphery is exposed outside the groove (111); Wherein, a plating layer (140) is connected to the periphery of the conductive piece (130) exposed outside the groove (111).
3. The ownerless grid photovoltaic module according to claim 2, characterized in that The plating layer (140) and the main-gridless cell (110) have the same color.
4. The ownerless grid photovoltaic module according to claim 1, wherein The number of the grooves (111), the welding pieces (120) and the conductive pieces (130) is multiple, and the multiple grooves (111), the multiple welding pieces (120) and the multiple conductive pieces (130) correspond to each other one by one; Each conductive piece (130) is accommodated in the corresponding groove (111), and each conductive piece (130) is welded to the main-gridless cell (110) through the corresponding welding piece (120).
5. The ownerless grid photovoltaic module according to claim 1, wherein The welding piece (120) includes tin powder, and the tin powder fills at least part of the space of the groove (111).
6. A preparation method for a main-gridless photovoltaic module as described in any one of claims 1 - 5, characterized in that, Comprising: Placing the welding piece (120) in the groove (111) of the main-gridless cell (110), and the surface of the welding piece (120) is spaced from the notch of the groove (111); Putting the conductive piece (130) into the groove (111) so that the conductive piece (130) contacts the welding piece (120); Welding the main-gridless cell (110) and the conductive piece (130) through the welding piece (120).
7. The preparation method according to claim 6, characterized in that, Before the step of placing the welding piece (120) in the groove (111) of the main-gridless cell (110), further comprising: Selecting a material with the same color as the main-gridless cell (110) and electroplating it on a part of the periphery of the conductive piece (130) to form a plating layer (140).
8. The preparation method according to claim 7, wherein The step of putting the conductive piece (130) into the groove (111) so that the conductive piece (130) contacts the welding piece (120) includes: Contacting another part of the periphery of the conductive piece (130) with the welding piece (120); and making a part of the periphery connected with the plating layer (140) exposed outside the groove (111).
9. The preparation method according to claim 6, characterized in that The step of placing the welding piece (120) in the groove (111) of the main-gridless cell (110) includes: Lay tin powder into the groove (111) so that the tin powder fills half of the space of the groove (111).
10. The preparation method according to claim 6, wherein, The step of welding the main-gridless cell (110) and the conductive member (130) through the welding member (120) includes: Heating and laminating the main-gridless cell (110), the welding member (120), and the conductive member (130); After the lamination is completed, cool the main-gridless cell (110), the welding member (120), and the conductive member (130).