Junction box and photovoltaic module
By designing the connection bracket of the junction box is higher than the diode and setting the welding part on the welding surface, the problem of diode being susceptible to heat breakdown during laser welding is solved, and a more stable welding effect and diode protection is achieved.
Patent Information
- Application Number
- CN202420106785.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-16
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-01-16
AI Technical Summary
In the field of photovoltaics, conventional junction boxes are easily touched by the lead wire or metal bracket during preparation, resulting in the problem of thermal breakdown of the diode chip.
A junction box is designed, including a box body component, diode and a connecting bracket. The connecting bracket is higher than the diode. The connecting member and the bracket are welded at a position above the diode to avoid the diode being heated. The welding part has a welding surface to ensure that the connecting parts and Good welding of brackets.
Effectively protect the diode from laser, avoid thermal breakdown of the diode chip, and ensure sufficient welding of the connecting parts and the bracket under high-temperature welding conditions to avoid poor welding.
Smart Images
Figure CN222169762U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaics, in particular to a junction box and a photovoltaic component. Background Art
[0002] In the photovoltaic field, the welding process of the junction box in the process of solar cell manufacturing is developing in a diversified way. The current welding processes include electromagnetic welding, resistance welding and laser welding. During laser welding, the lead and the bracket are directly fused at high temperature. The peeling force after welding is large and the state is stable. Compared with other welding methods, laser welding has the advantages of not requiring tin blocks and external tin wires. Because laser welding does not use tin blocks or tin wires for direct welding, the temperature used is relatively high. During the welding process, it is necessary to avoid the diode to prevent the diode chip from thermal breakdown. When preparing the traditional junction box, the diode will inevitably touch the lead or metal bracket, which can easily cause damage to the diode and cause the problem of thermal breakdown of the diode chip. Utility Model Content
[0003] Based on this, it is necessary to provide a junction box. The junction box of the utility model has a simple structure and can effectively protect the diode from the influence of laser and avoid the occurrence of thermal breakdown of the diode chip.
[0004] An embodiment of the present application provides a junction box.
[0005] A junction box comprises a box body, a diode, a connecting component and a connecting bracket, wherein the diode, the connecting component and the connecting bracket are respectively arranged in the box body, the connecting brackets are respectively arranged on both sides of the diode, the connecting brackets are connected to the diode to form a passage, the connecting brackets are higher than the diode, the connecting components are respectively connected to the connecting brackets, and the connecting components are led out of the box body to be electrically connected to an external circuit.
[0006] In some embodiments, the box body component includes a box base and a box cover, the diode, the connecting component and the connecting bracket are respectively arranged in the box base and connected to the bottom surface of the box base, and the box cover is encapsulated on the box base.
[0007] In some of these embodiments, the height of the connecting bracket is lower than the height of the box base.
[0008] In some embodiments, the connecting bracket includes a welding portion and a supporting portion, the welding portion is connected to the bottom surface of the box base through a plurality of supporting portions, the welding portion is also connected to the diode to form a passage, and the connecting component is connected to the welding portion.
[0009] In some of the embodiments, the welding portion has a welding surface, the welding surface is parallel to the bottom surface of the box base, and the connecting component is connected to the welding surface.
[0010] In some embodiments, the welding portion is a conductive metal sheet.
[0011] In some embodiments, the area of the welding portion is between 160 mm² and 260 mm².
[0012] In some embodiments, the thickness of the welding portion is between 0.6 mm and 2.0 mm.
[0013] In some embodiments, the connecting member is a conductive metal strip.
[0014] In some embodiments, the diode is an axial diode, a module diode or a chip diode.
[0015] An embodiment of the present application also provides a photovoltaic module.
[0016] A photovoltaic assembly comprises the junction box.
[0017] The above-mentioned junction box structure is more concise and is conducive to popularization and use. In the preparation process, the use of laser welding is more reasonable and convenient, which can effectively protect the diode from the influence of the laser and avoid the thermal breakdown of the diode chip. Specifically, in the junction box of the present application, a connecting bracket is set higher than the diode. During laser welding, the connecting component and the connecting bracket are welded at a position above the diode to prevent the diode from being heated and the chip from being broken down by heat energy.
[0018] The junction box can effectively avoid the problem of poor welding caused by separation between the connection components such as the lead wire and the connection bracket by providing the welding surface of the welding portion. During laser welding, the use temperature is between 800°C and 1200°C, which can effectively achieve sufficient welding between the connection components such as the lead wire and the connection bracket, and avoid separation of the connection components from the connection bracket. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.
[0020] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.
[0021] FIG1 is a schematic diagram of a partial structure of a junction box according to an embodiment of the present utility model;
[0022] FIG. 2 is a schematic diagram of another part of the structure of the junction box according to an embodiment of the present invention.
[0023] Description of Reference Numerals
[0024] 10. Junction box; 100. Box body component; 200. Diode; 300. Connecting component; 400. Connecting bracket. DETAILED DESCRIPTION
[0025] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.
[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0028] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0029] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0031] The embodiment of the present application provides a junction box 10 to solve the problem in the conventional art that the diode 200 inevitably touches the lead wire or the metal bracket during the preparation of the junction box 10, which easily causes damage to the diode 200 and thermal breakdown of the diode 200 chip. The junction box 10 will be described below in conjunction with the accompanying drawings.
[0032] The junction box 10 provided in the embodiment of the present application is exemplified as shown in Figure 1, which is a schematic diagram of the structure of the junction box 10 provided in the embodiment of the present application. The junction box 10 of the present application can effectively protect the diode 200, has a simpler structure, outstanding advantages, and is conducive to popularization and use.
[0033] In order to more clearly illustrate the structure of the junction box 10 , the junction box 10 will be introduced below with reference to the accompanying drawings.
[0034] For example, please refer to FIG. 1, which is a schematic diagram of the structure of a junction box 10 provided in an embodiment of the present application. A junction box 10 includes a box body component 100, a diode 200, a connecting component 300 and a connecting bracket 400. The diode 200, the connecting component 300 and the connecting bracket 400 are respectively arranged in the box body component 100. Connecting brackets 400 are respectively arranged on both sides of the diode 200. The connecting bracket 400 is connected to the diode 200 to form a passage. The connecting bracket 400 is higher than the diode 200. The connecting components 300 are respectively connected to the connecting bracket 400, and the connecting components 300 are led out of the box body component 100 to be electrically connected to the external circuit.
[0035] In the junction box 10 of the present embodiment, the connection bracket 400 is arranged higher than the diode 200. During laser welding, the connection component 300 and the connection bracket 400 are welded above the diode 200 to prevent the diode 200 from being heated and the chip from being broken down by heat energy.
[0036] In some embodiments, the box body 100 includes a box base and a box cover. The box base has an inner cavity. The diode 200, the connecting component 300 and the connecting bracket 400 are respectively arranged in the inner cavity of the box base and connected to the bottom surface of the box base, and the box cover is encapsulated on the box base. The box cover is not shown in Figures 1 and 2.
[0037] In some of these embodiments, the height of the connecting bracket 400 is lower than the height of the box base.
[0038] In some embodiments, the connecting bracket 400 includes a welding portion and a supporting portion. The welding portion is connected to the bottom surface of the box base through a plurality of supporting portions. The welding portion is also connected to the diode 200 to form a passage, and the connecting component 300 is connected to the welding portion.
[0039] In some embodiments, the welding portion has a welding surface. The welding surface is parallel to the bottom surface of the box base. The connecting component 300 is connected to the welding surface. The above-mentioned junction box 10 can effectively avoid the problem of poor welding caused by the separation between the connecting component 300 such as the lead and the connecting bracket 400 by providing the welding surface of the welding portion. During laser welding, the welding temperature is between 800°C and 1200°C, which can effectively achieve sufficient welding between the connecting component 300 such as the lead and the connecting bracket 400, and avoid the phenomenon of loosening and separation between the connecting component 300 and the connecting bracket 400.
[0040] In some of the embodiments, the supporting portion may be a supporting column, and the supporting column is made of insulating material.
[0041] In some embodiments, the box base is a flat columnar structure as a whole, please refer to Figure 2, which is a schematic diagram of another part of the structure of the junction box 10 provided in the embodiment of the present application. When the box base is placed on a horizontal plane, the bottom surface of the box base is horizontal. At this time, the welding portion has a horizontal welding surface. Such a setting facilitates the laser welding process and is easy to operate.
[0042] In some embodiments, the cover portion is a flat structure.
[0043] In some embodiments, the welding portion is a conductive metal sheet, for example, a pure copper metal sheet, or a copper tin-plated, copper galvanized or other metal sheet.
[0044] In some embodiments, the area of the welding surface of the welding portion is between 160 mm² and 260 mm². For example, in one specific example, the area of the welding surface of the welding portion is 160 mm². In another specific example, the area of the welding surface of the welding portion is 260 mm². It is not difficult to understand that in other specific examples, the area of the welding surface of the welding portion can also be 170 mm², 180 mm², 190 mm², 200 mm², 210 mm², 220 mm², 230 mm², 240 mm², 250 mm² or other values.
[0045] In some of the embodiments, the welding surface of the welding portion is in a square shape. It is not difficult to understand that in other specific examples, the welding surface of the welding portion can also be in other shapes, such as an ellipse, a circle, a triangle, etc.
[0046] In some embodiments, the thickness of the welding portion is between 0.6 mm and 2.0 mm. For example, in one specific example, the thickness of the welding portion is 0.6 mm. In another specific example, the thickness of the welding portion is 2.0 mm. It is not difficult to understand that in other specific examples, the thickness of the welding portion can also be 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.14 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm or other values. The thickness of the welding portion of this embodiment is not easy to be too large or too small. When the thickness of the welding portion is too large, the material cost of the welding portion will increase, which will directly increase the production cost of the junction box 10, which is not conducive to cost reduction and efficiency improvement. When the thickness of the welding portion is too small, the welding portion is in the welding process of the connecting component 300, which is easy to be burned through by the high temperature of the laser, resulting in poor connection between the welding portion and the connecting component 300, and the welding portion and the connecting component 300 are easy to separate, causing poor contact.
[0047] In some embodiments, the connecting component 300 is a conductive metal strip, for example, a pure copper metal strip, or a copper-tinned, copper-galvanized or other metal strip.
[0048] In some embodiments, the diode 200 is an axial diode 200, a module diode 200 or a chip diode 200. It is not difficult to understand that the diode 200 can also be a diode 200 in other forms.
[0049] In some embodiments, the box body component 100 including the box base and the box cover is made of anti-aging and UV-resistant materials, so that the box body component 100 has extremely high anti-aging and UV-resistant capabilities, so that the junction box 10 meets the use requirements under harsh outdoor environmental conditions.
[0050] An embodiment of the present application also provides a photovoltaic module.
[0051] A photovoltaic assembly comprises the junction box 10 mentioned above.
[0052] In summary, the junction box 10 has a simpler structure and is easy to promote and use. In the preparation process, laser welding is more reasonable and convenient, and can effectively protect the diode 200 from the influence of laser and avoid thermal breakdown of the diode 200 chip.
[0053] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0054] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0055] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A junction box (10), characterized in that: The invention comprises a box body component (100), a diode (200), a connecting component (300) and a connecting bracket (400), wherein the diode (200), the connecting component (300) and the connecting bracket (400) are respectively arranged in the box body component (100), the connecting bracket (400) is respectively arranged on both sides of the diode (200), the connecting bracket (400) is connected to the diode (200) to form a passage, the connecting bracket (400) is higher than the diode (200), the connecting components (300) are respectively connected to the connecting bracket (400), and the connecting components (300) are led out of the box body component (100) to be electrically connected to an external circuit.
2. The junction box (10) according to claim 1, characterized in that: The box body component (100) comprises a box base and a box cover, the diode (200), the connecting component (300) and the connecting bracket (400) are respectively arranged in the box base and connected to the bottom surface of the box base, and the box cover is encapsulated on the box base.
3. The junction box (10) according to claim 2, characterized in that: The height of the connecting bracket (400) is lower than the height of the box base.
4. The junction box (10) according to any one of claims 2 to 3, characterized in that: The connection bracket (400) comprises a welding portion and a supporting portion, the welding portion is connected to the bottom surface of the box base via a plurality of supporting portions, the welding portion is also connected to the diode (200) to form a passage, and the connection component (300) is connected to the welding portion.
5. The junction box (10) according to claim 4, characterized in that: The welding portion has a welding surface, the welding surface is parallel to the bottom surface of the box base, and the connecting component (300) is connected to the welding surface.
6. The junction box (10) according to claim 4, characterized in that: The welding portion is a conductive metal sheet.
7. The junction box (10) according to claim 6, characterized in that: The area of the welding portion is between 160 mm² and 260 mm².
8. The junction box (10) according to claim 6, characterized in that: The thickness of the welding portion is between 0.6 mm and 2.0 mm.
9. The junction box (10) according to any one of claims 1 to 3 and 5 to 8, characterized in that: The connecting component (300) is a conductive metal strip.
10. A photovoltaic module, characterized in that: The photovoltaic assembly comprises the junction box (10) according to any one of claims 1 to 9.