Photovoltaic module bus bar and photovoltaic module
By setting recesses on the base welding surface of the photovoltaic module bus bar and filling the flux, and then melting and exposing the flux from the encapsulation layer during welding, the uncontrollable and high cost problems of sponge-applying flux in the prior art are solved, and a more reliable and economical welding process is achieved.
Patent Information
- Application Number
- CN202421588680.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-05
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-07-05
AI Technical Summary
In the welding of existing photovoltaic modules, sponges are used to apply flux when contact scratches, resulting in uncontrollable flux usage, high cost, and frequent foreign matter introduction and maintenance.
A photovoltaic module bus bar is designed, with a recess on the base welding surface of the recess, and flux is filled with the recess, the encapsulation layer covers the recess groove, and the melting point of the encapsulation layer is not higher than the heating temperature of the welding process. The encapsulation layer is melted through the heating temperature of the welding process and exposed flux is used for welding.
The welding method without sponge is realized, which avoids the problems of unstable flux usage, volatilization, frequent foreign matter introduction and maintenance, reduces costs and improves the reliability of welding.
Smart Images
Figure CN222776532U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of solar cells, in particular to a photovoltaic component bus bar and a photovoltaic component. Background Art
[0002] With the development of solar cells and modules, cost reduction and efficiency improvement are the mainstream development direction of the industry. In order to further reduce the amount of silver paste, the 0BB (0 Busbar) module technology without main grid has emerged. The interconnection technology of 0BB modules is the main research direction of the industry at present, in order to improve the performance of welding and the reliability of connection.
[0003] The existing photovoltaic welding strips and busbars are still interconnected by applying flux, and the flux is usually applied to the busbar during the stacking process. The implementation method is: use a sponge to store the flux, press the busbar on top of the sponge, and then press the busbar down to make the busbar contact and rub against the sponge, and the flux is applied to the busbar.
[0004] However, in the prior art, using a sponge to contact and rub the busbar will cause a series of problems such as uncontrollable flux usage and high cost. Therefore, how to provide a welding method without applying flux when welding the busbar is an urgent problem to be solved by those skilled in the art. Utility Model Content
[0005] The purpose of the utility model is to provide a photovoltaic module bus bar, which can be provided with flux in a non-smearing manner; another purpose of the utility model is to provide a photovoltaic module, which can be provided with flux in a non-smearing manner.
[0006] In order to solve the above technical problems, the utility model provides a photovoltaic module bus bar, including a substrate and a packaging layer;
[0007] The welding surface of the substrate is provided with a depression, and the depression is filled with flux;
[0008] The packaging layer covers the recessed notch exposed on the substrate welding surface, and the melting point of the packaging layer is not higher than the heating temperature of the welding process.
[0009] Optionally, an extension direction of the recess is parallel to a length direction of the substrate.
[0010] Optionally, the substrate is provided with a plurality of the depressions, and the plurality of the depressions are parallel to each other and evenly distributed at equal intervals on the welding surface of the substrate.
[0011] Optionally, the depressions are distributed in a grid-like manner on the welding surface of the substrate.
[0012] Optionally, the soldering flux is a non-fluid soldering flux.
[0013] Optionally, the soldering flux is any one of the following or a mixed soldering flux in any combination:
[0014] Solid flux, gel flux, paste flux.
[0015] Optionally, the encapsulation layer is a tin layer.
[0016] Optionally, the encapsulation layer covers the surface of the substrate.
[0017] Optionally, the substrate is a copper substrate.
[0018] The utility model also provides a photovoltaic module, comprising a solar cell, a welding strip and a photovoltaic module bus bar as described in any one of the above items; the welding strip is arranged on the surface of the solar cell, and the photovoltaic module bus bar and the extension portion of the welding strip extending out of the solar cell are welded to each other; the welding material between the welding strip and the base of the bus bar is a mixture of solder, the flux and the encapsulation layer after melting; the welding surface of the base is provided with a depression, and the depression is filled with the flux; before welding, the encapsulation layer covers the depression and exposes the notch on the welding surface of the base, and the melting point of the encapsulation layer is not higher than the heating temperature of the welding process.
[0019] The utility model provides a photovoltaic module bus bar, comprising a substrate and a packaging layer; the welding surface of the substrate is provided with a depression filled with flux; the packaging layer covers the depression and the notch exposed on the welding surface of the substrate, and the melting point of the packaging layer is not higher than the heating temperature of the welding process.
[0020] During the welding process, since the heating temperature of the welding process is higher than the melting point of the packaging layer, the packaging layer will melt and expose the flux. Welding has been achieved in the welding process, which eliminates the use of sponges, avoids the risk of unstable flux usage, volatilization, introduction of foreign matter caused by wear, and waste and production capacity impact caused by maintenance.
[0021] The utility model also provides a photovoltaic module, which also has the above-mentioned beneficial effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0023] Figure 1A schematic diagram of the structure of a substrate in a photovoltaic module bus bar provided by an embodiment of the utility model;
[0024] Figure 2 A schematic diagram of the side structure of a photovoltaic module bus bar provided by an embodiment of the utility model;
[0025] Figure 3 This is a schematic diagram of a busbar passing auxiliary mechanism in an embodiment of the utility model;
[0026] Figure 4 This is a schematic diagram of the structure of the busbar after passing through the auxiliary mechanism in the embodiment of the utility model;
[0027] Figure 5 A schematic structural diagram of a photovoltaic module provided in an embodiment of the utility model.
[0028] In the figure: 1. substrate, 2. depression, 3. packaging layer, 4. knurling wheel, 5. friction wheel, 6. solar cell, 7. welding ribbon. DETAILED DESCRIPTION
[0029] The core of the utility model is to provide a photovoltaic module busbar. In the prior art, the photovoltaic welding strip and the busbar are still interconnected by applying flux, which is usually applied to the busbar during the stacking process. The implementation method is: using a sponge to store the flux, then pressing the busbar on the sponge, and then pressing the busbar down so that the busbar and the sponge are in contact and scratched, and the flux is applied to the busbar.
[0030] The main problems of this technical solution are as follows:
[0031] First: foreign matter. When the busbar is full of flux, it is easy for foreign matter in the environment to adhere to it, or foreign matter may be brought into the component due to sponge damage, causing welding appearance problems.
[0032] Second: Equipment maintenance. When the busbar and sponge are scratched for a long time, the sponge is easily damaged and needs to be regularly maintained and replaced, which not only increases the number of equipment maintenance times, but also affects the stability and production capacity of the production process.
[0033] Third: The amount used is uncontrollable. Due to the long-term squeezing of the sponge by the busbar or the wear and deformation of the sponge, the flux is unevenly applied on the surface of the busbar, affecting the welding effect, resulting in ineffective bonding with the welding ribbon, reduced current collection, and reduced component power.
[0034] Fourth: Cost issue. Using a sponge to absorb flux and apply it to the busbar will cause the flux to come into contact with the air over a large area, increasing its volatilization. Secondly, when the sponge is replaced, the residual flux in the sponge will also be thrown away with the sponge, resulting in a great waste.
[0035] The utility model provides a photovoltaic module bus bar, including a substrate and a packaging layer; the welding surface of the substrate is provided with a depression, and the depression is filled with flux; the packaging layer covers the depression and the notch exposed on the welding surface of the substrate, and the melting point of the packaging layer is not higher than the heating temperature of the welding process.
[0036] During the welding process, since the heating temperature of the welding process is higher than the melting point of the packaging layer, the packaging layer will melt and expose the flux. Welding has been achieved in the welding process, which eliminates the use of sponges, avoids the risk of unstable flux usage, volatilization, introduction of foreign matter caused by wear, and waste and production capacity impact caused by maintenance.
[0037] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.
[0038] Embodiment 1
[0039] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a substrate in a photovoltaic module bus bar provided by an embodiment of the utility model; Figure 2 A schematic diagram of the side structure of a photovoltaic module bus bar provided by an embodiment of the utility model; Figure 3 This is a schematic diagram of a busbar passing auxiliary mechanism in an embodiment of the utility model; Figure 4 It is a schematic diagram of the structure after the busbar passes through the auxiliary mechanism in the embodiment of the utility model.
[0040] See also Figure 1 as well as Figure 2 In an embodiment of the utility model, a busbar of a photovoltaic module includes a substrate 1 and an encapsulation layer 3; a depression 2 is provided on the welding surface of the substrate 1, and the depression 2 is filled with flux; the encapsulation layer 3 covers the notch of the depression 2 exposed on the welding surface of the substrate 1, and the melting point of the encapsulation layer 3 is not higher than the heating temperature of the welding process.
[0041] The substrate 1 is the main material of the busbar. In this embodiment, the substrate 1 is generally in the shape of a strip and has a preset length direction. In this embodiment, the substrate 1 is usually a copper substrate 1. Of course, substrates 1 of other materials can also be selected. The specific material of the substrate 1 is not specifically limited in this embodiment and depends on the specific situation.
[0042] In this embodiment, the substrate 1 has a surface facing the welding strip 7 after welding, which is a welding surface for welding with the welding strip 7, and a non-welding surface facing away from the welding strip 7 and not used for welding with the welding strip 7. In this embodiment, a depression 2 is specifically provided on the welding surface of the substrate 1, and a depression 2 is not provided on the non-welding surface, and the depression 2 is filled with flux. The flux will fix the substrate 1 and the welding strip 7 during welding, and the specific components of the flux can be set according to actual conditions, and are not specifically limited here. In this embodiment, by providing the depression 2 and filling the depression 2 with flux, the busbar can be provided with flux, avoiding the introduction of foreign matter during the application of flux. At the same time, due to the elimination of the use of sponges, the number of equipment maintenance and the loss of production capacity can be reduced. For the busbar with flux provided in this embodiment, the storage amount of flux in the busbar is certain, so that the amount of flux can be controlled to avoid waste. In this embodiment, the above-mentioned depression 2 can be a groove-shaped depression or a hole-shaped depression. Its specific structure can be set according to actual conditions and is not specifically limited here.
[0043] In this embodiment, the above-mentioned depression 2 is exposed with a notch on the welding surface of the substrate 1, and the encapsulation layer 3 at least covers the notch to seal the flux in the depression 2 in the depression 2 to prevent the loss of the flux during use and transportation. The melting point of the above-mentioned encapsulation layer 3 needs to be less than or equal to the heating temperature of the welding process, that is, when welding the bus bar and the welding ribbon 7, the encapsulation layer 3 will melt to expose the flux for welding. Correspondingly, after welding, the welding material between the welding ribbon 7 and the bus bar is usually a mixture of solder, flux and encapsulation layer 3.
[0044] In the process of using the above busbar, the packaging layer 3 is melted by heating and welding, and the flux is exposed, so as to clean the welding part and reduce the surface tension of the solder.
[0045] Specifically, in this embodiment, the depressions 2 are usually evenly arranged on the welding surface of the substrate 1 to ensure that the flux is evenly distributed on the welding surface. In this embodiment, two distribution structures of the depressions 2 are specifically provided. The first is that the extension direction of the depression 2 is parallel to the length direction of the substrate 1. At this time, the depression 2 is usually in a strip shape, and the depression 2 is used to store the flux. Specifically, the substrate 1 is usually provided with a plurality of depressions 2, and the plurality of depressions 2 are parallel to each other and evenly distributed at equal intervals on the welding surface of the substrate 1. Taking three parallel depressions 2 as an example, in this structure, the depression 2 located in the middle overlaps with the center line of the busbar, and the other two depressions 2 are located on both sides of the depression 2 overlapping with the center line. The three depressions 2 are parallel and evenly arranged on the welding surface of the substrate 1, and the three depressions 2 are evenly spaced. The width and depth of each of the above depressions 2 are usually uniform, that is, the width of the entire depression 2 is a certain value, and the depth is also a certain value, to ensure that the flux can be evenly distributed on the welding surface of the substrate 1.
[0046] The second type is that the depressions 2 are distributed in a grid pattern on the welding surface of the substrate 1. The grid-shaped depressions 2 also need to be evenly distributed on the welding surface of the substrate 1, and the width and depth of each depression 2 are usually uniform, that is, the width of each section of the depression 2 is a certain value, and the depth is also a certain value, to ensure that the flux can be evenly distributed on the welding surface of the substrate 1.
[0047] In this embodiment, the encapsulation layer 3 is usually a tin layer. Obviously, the melting point of metal tin is lower than the heating temperature of the welding process, so that the tin layer can melt during the welding process to expose the soldering flux. Of course, in this embodiment, there is no specific limitation on the specific material of the encapsulation layer 3, as long as it can play the above-mentioned function.
[0048] Generally, in this embodiment, the encapsulation layer 3 covers the entire surface of the substrate 1, so that the encapsulation layer 3 can cover the notch where the recess 2 is exposed on the welding surface of the substrate 1. Of course, in this embodiment, the encapsulation layer 3 can also be arranged only on the welding surface of the substrate 1 to cover the notch, or even only along the edge of the notch. The specific covering method of the encapsulation layer 3 is not specifically limited in this embodiment.
[0049] In this embodiment, the flux is usually a non-fluid flux. In actual situations, the flux will be packaged in the depression 2 of the busbar and transported, loaded, and curled together. If the flux is a fluid flux, it is very easy to cause the flux to flow out during the above process, resulting in a waste of flux. However, this embodiment specifically uses a non-fluid flux and uses the encapsulation layer 3 for sealing, which can ensure that the flux will not easily flow out of the depression 2.
[0050] Specifically, in this embodiment, the soldering flux can be any one of the following or any combination of mixed soldering flux: solid soldering flux, gel soldering flux, paste soldering flux. The above types of soldering flux will not easily flow out of the recess 2, and can be relatively firmly fixed in the recess 2, avoiding waste caused by the flux flowing out.
[0051] Please refer to Figure 3 as well as Figure 4Correspondingly, when the non-fluid flux is contained in the depression 2 of the substrate 1, in the process of welding the busbar in this embodiment, an auxiliary mechanism will be used to process the busbar first. Specifically, in this embodiment, a pair of rollers arranged opposite to each other will be provided, and the rollers include a knurling wheel 4 having sharp regular protrusions on the surface and a friction wheel 5 which usually has no obvious protrusions on the surface. Before welding, the busbar is passed between the two rollers, and it is ensured that the knurling wheel 4 can apply pressure to the welding surface of the substrate 1, so that the encapsulation layer 3 of the welding surface is crushed by the sharp regular protrusions to preliminarily expose the flux, so that the subsequent flux can fully assist in welding. The surface of the friction wheel 5 usually needs to have a large friction force so that it can clamp the busbar and have sufficient force to allow the knurling wheel 4 to crush the encapsulation layer 3 on the surface of the busbar.
[0052] The photovoltaic module busbar provided in this embodiment uses a busbar with built-in flux to avoid foreign matter being introduced during the process of applying flux; it can eliminate the use of sponges, reduce the number of equipment maintenance times and the loss of production capacity; the busbar with built-in flux has a certain amount of flux stored in the busbar, which can control the amount and avoid waste.
[0053] Embodiment 2
[0054] The photovoltaic assembly provided in the embodiment of the present utility model is introduced below. The photovoltaic assembly described below and the photovoltaic assembly bus bar described above can refer to each other.
[0055] Please refer to Figure 5 , Figure 5 A schematic structural diagram of a photovoltaic module provided in an embodiment of the utility model.
[0056] See also Figure 5 In this embodiment, the photovoltaic module includes a solar cell 6, a welding strip 7 and a photovoltaic module bus bar as described in any of the above embodiments; the surface of the solar cell 6 is provided with the welding strip 7, and the photovoltaic module bus bar and the extension of the welding strip 7 extending out of the solar cell 6 are welded to each other; the welding material between the welding strip 7 and the base 1 of the bus bar is a mixture of solder, the flux and the encapsulation layer 3 after melting; the welding surface of the base 1 is provided with a recess 2, and the recess 2 is filled with the flux; before welding, the encapsulation layer 3 covers the notch of the recess 2 exposed on the welding surface of the base 1, and the melting point of the encapsulation layer 3 is not higher than the heating temperature of the welding process. The specific structure of the bus bar has been described in detail in the above utility model embodiments, and will not be repeated here.
[0057] In this embodiment, the solar cell 6 can be a busbarless cell or other cells, and a welding strip 7 is provided on its surface. The welding strip 7 extends out of the solar cell 6 and is welded to the bus bar. In this embodiment, the welding surface of the bus bar and the welding strip 7 are welded to each other. Before welding, the welding surface of the bus bar can have a knurling mark formed by the knurling wheel 4 crushing the packaging layer 3. The welding material between the bus bar and the welding strip 7 can be a mixture formed by solder, flux stored in the recess 2, and the melted packaging layer 3.
[0058] Since the photovoltaic module provided in this embodiment specifically uses the photovoltaic module busbar provided in the above-mentioned embodiment, the photovoltaic module can avoid the introduction of foreign matter during the application of flux by using a busbar with its own flux, thereby having higher quality; it can eliminate the use of sponges, reduce the number of equipment maintenance times and the loss of production capacity; the busbar with its own flux has a certain amount of flux stored in the busbar, which can control the amount and avoid waste, thereby reducing costs.
[0059] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.
[0060] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.
[0061] The above is a detailed introduction to a photovoltaic module busbar and photovoltaic module provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.
Claims
1. A photovoltaic module busbar, characterized in that: comprising a substrate and a packaging layer; The welding surface of the substrate is provided with a depression, and the depression is filled with flux; The packaging layer covers the recessed notch exposed on the substrate welding surface, and the melting point of the packaging layer is not higher than the heating temperature of the welding process.
2. The photovoltaic module busbar according to claim 1, characterized in that: An extending direction of the recess is parallel to a length direction of the base.
3. The photovoltaic module busbar according to claim 2, characterized in that: The base is provided with a plurality of depressions, which are parallel to each other and evenly distributed at equal intervals on the welding surface of the base.
4. The photovoltaic module busbar according to claim 1, characterized in that: The depressions are distributed in a mesh shape on the welding surface of the base.
5. The photovoltaic module busbar according to claim 1, characterized in that: The soldering flux is a non-fluid soldering flux.
6. The photovoltaic module busbar according to claim 5, characterized in that: The soldering flux is any one of the following or a mixed soldering flux in any combination: Solid flux, gel flux, paste flux.
7. The photovoltaic module busbar according to claim 1, characterized in that: The packaging layer is a tin layer.
8. The photovoltaic module busbar according to claim 1, characterized in that: The packaging layer covers the surface of the substrate.
9. The photovoltaic module busbar according to claim 1, characterized in that: The substrate is a copper substrate.
10. A photovoltaic module, characterized in that: It comprises a solar cell, a welding ribbon and a photovoltaic module bus bar as claimed in any one of claims 1 to 9; the welding ribbon is arranged on the surface of the solar cell, and the photovoltaic module bus bar and the extension portion of the welding ribbon extending out of the solar cell are welded to each other; the welding material between the welding ribbon and the base of the bus bar is a mixture of solder, the flux and the encapsulation layer after melting; the welding surface of the base is provided with a depression, and the depression is filled with the flux; before welding, the encapsulation layer covers the depression and exposes the notch on the welding surface of the base, and the melting point of the encapsulation layer is not higher than the heating temperature of the welding process.