Junction box and solar cell module

Abstract

The invention relates to a junction box and a solar cell module. The junction box comprises a box body; the connecting parts are fixed to the box body and extend away from the box body in the first direction, the connecting parts are arranged side by side in the second direction perpendicular to the first direction, each connecting part comprises a root close to the box body and an end away from the box body, and the outer contour of the cross section of the end is gradually expanded in the direction away from the box body; the wiring terminals are arranged on the corresponding connecting parts in a penetrating mode in the first direction; and the plurality of external connection pieces are arranged in the box body and are electrically connected with the plurality of wiring terminals in a one-to-one correspondence manner. The junction box has high connection strength after being connected to external equipment.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic equipment, and in particular to a junction box and a solar cell module. Background Art

[0002] Photovoltaic equipment is often used outdoors. Due to the poor use environment, there are certain requirements for the durability of photovoltaic equipment. Photovoltaic equipment can be integrated into different systems, and the most widely used one is still solar panels for power generation.

[0003] The solar panel is in the shape of a plate and can be mounted on a bracket. The solar panel includes many cells arranged in an array, which generate electricity under sunlight. Usually, a bus bar is used to combine the electricity of multiple cells and then output it to the outside. In order to output the current, a junction box is usually set.

[0004] Depending on the circuit layout of the solar panel, some types of junction boxes are set in the middle of the back of the solar panel, and some types of junction boxes can be set on the side of the solar panel. Due to the structural limitations of the solar panel, the structural design of the junction box is also limited; in addition, the wiring from the junction box to the outside is also limited. On this basis, it is still expected that the junction box will be durable and reduce the frequency of failure. Summary of the invention

[0005] Based on this, it is necessary to provide a junction box and a solar cell module to address at least one of the above problems.

[0006] On the one hand, the present application provides a junction box, which includes: a box body; a plurality of connecting parts, which are fixed to the box body and extend away from the box body along a first direction, and the plurality of connecting parts are arranged in parallel along a second direction perpendicular to the first direction, and the connecting parts include a root close to the box body and an end away from the box body, wherein the outer contour of the cross-section of the end gradually expands along the direction away from the box body; a plurality of connecting terminals, which are inserted into the corresponding connecting parts along the first direction; and a plurality of external connecting parts, which are arranged on the box body and electrically connected to the plurality of connecting terminals one by one.

[0007] By setting the outer contour of the cross section of the end portion of the connection portion to gradually expand, it is helpful to form a barbed surface, increase the force and prevent falling off. After the junction box is connected to the external device, it has a high connection strength and avoids the failure of the electrical connection of the terminal. In addition, after a long period of use, it still has the ability to prevent falling off.

[0008] In some embodiments, a width dimension of the end portion along the second direction is greater than a thickness dimension of the end portion along a third direction, and the third direction is perpendicular to the first direction and perpendicular to the second direction.

[0009] With this arrangement, the end portion is thinner, the junction box can fit the solar panel, and takes up a reasonable installation space.

[0010] In some embodiments, the end portion includes an end body for arranging a connection terminal and end side wings located on both sides of the end body along the second direction, and the thickness of the end side wings is thinner at a position farther away from the end body.

[0011] With such arrangement, the junction box is connected to the solar panel, and the end portion can better fit the layer structure of the solar panel, and can also achieve a higher connection strength with the layer structure, thereby preventing the junction box from falling off.

[0012] In some embodiments, the projection profile of the end portion along the third direction is a trapezoid; the projection profile of the end body along the third direction is a trapezoid. The shape of the end portion is simple and easy to manufacture.

[0013] With such arrangement, the end body can further limit the recessed layer structure at the end flank, which is beneficial to improving the connection strength.

[0014] In some embodiments, the distance between two adjacent ends is smaller than the width dimension of the end flanks.

[0015] With such arrangement, the layer structure trapped therein can be better locked between two adjacent ends.

[0016] Exemplarily, the distance between two adjacent ends ranges from 1 mm to 2 mm.

[0017] With this arrangement, the junction box has a compact structure and leaves enough space to ensure the connection strength.

[0018] Exemplarily, the width dimension D3 of the end body and the width dimension D2 of the end satisfy: 40%×D2≤D3≤90%×D2.

[0019] With such arrangement, the connection part is suitable for passing the connection terminal, and the connection strength is ensured; the layout of the junction box is appropriate.

[0020] Exemplarily, the angle θ between the side of the end portion and the tip of the end portion ranges from 45° to 85°.

[0021] With such arrangement, the stress condition of the connection part is better and the space can be effectively utilized.

[0022] In some embodiments, the junction box further includes at least one reinforcement portion, the reinforcement portion is connected between roots of two adjacent connection portions, and the reinforcement portion is fixed to the box body.

[0023] With such arrangement, the reinforcement part can improve the structural strength of each connecting part, and help to better limit and fix the terminal.

[0024] In some embodiments, a dimension of the reinforcing portion along the first direction is greater than half of a dimension of the root portion, and a gap is provided between the reinforcing portion and the end portion.

[0025] With such arrangement, the structural strength of the junction box itself is sufficient, and the space between two adjacent connection parts is ensured, thereby ensuring the connection strength.

[0026] In some embodiments, the plurality of connection portions are arranged in a linear structure or an arc structure along the second direction.

[0027] With such arrangement, the junction box can be adapted to the solar panel in any shape.

[0028] In some embodiments, the extension directions of the plurality of external components are the same; the box body includes a first shell and a second shell, and the splicing direction of the first shell and the second shell is perpendicular to the extension direction of the external components.

[0029] With such arrangement, the assembly method of the box body is conducive to the installation and maintenance of the wiring terminals and external parts. The junction box is easy to assemble and maintain.

[0030] Exemplarily, the junction box further includes at least one diode, which is disposed in the accommodating cavity of the box body and is electrically connected between two corresponding connection terminals.

[0031] This configuration helps protect the circuit.

[0032] On the other hand, the present application provides a solar cell assembly, which includes: the aforementioned junction box; and a solar cell panel, including a first plate, a first adhesive layer, a bus line, a second adhesive layer and a second plate stacked in sequence, the connection portion of the junction box is connected between the first adhesive layer and the second adhesive layer, and the connection terminal is electrically connected to the bus line.

[0033] The solar cell assembly provided by the present application has good structural strength and simple structure, and its working performance is stable and reliable. In addition, the junction box is located at the side, so that the solar cell assembly leads the wires from the side, which is convenient for operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic isometric view of a junction box according to one or more embodiments; Figure 2 is a schematic left side view of a junction box according to one or more embodiments; Figure 3 is a schematic exploded view of a junction box according to one or more embodiments; Figure 4 A schematic diagram of dimension marking of a connection portion in a junction box according to one or more embodiments; Figure 5 for Figure 4 Bottom view of Figure 6 is a schematic structural diagram of a solar cell assembly according to one or more embodiments; Figure 7 for Figure 6 A schematic cross-sectional view at AA in the middle; Figure 8 is a schematic structural diagram of a solar cell assembly according to one or more embodiments; Fig. 9 is a schematic exploded view of a junction box according to one or more embodiments; Fig.10 is a schematic structural diagram of a junction box according to one or more embodiments; Fig.11 is a schematic exploded view of a junction box according to one or more embodiments; Fig.12 is a schematic structural diagram of a junction box according to one or more embodiments; Fig.13 is a schematic exploded view of a junction box according to one or more embodiments; Fig.14 is a schematic structural diagram of a junction box according to one or more embodiments; Fig.15 is a schematic exploded view of a junction box according to one or more embodiments; Fig.16 is a schematic structural diagram of a junction box according to one or more embodiments; Fig.17 is a schematic exploded view of a junction box according to one or more embodiments; Fig.18 is a schematic structural diagram of a first shell, a connecting portion, and a reinforcing portion in a junction box according to one or more embodiments; Fig.19 for Fig.18 Bottom view of Fig. 20 is a schematic exploded view of a junction box according to one or more embodiments; Fig.21 is a schematic structural diagram of a first shell, a connecting portion, and a reinforcing portion in a junction box according to one or more embodiments; Fig. 22 is a schematic diagram of a structure according to one or more embodiments; Fig.23 is a schematic exploded view of a junction box according to one or more embodiments; Fig.24 is a schematic diagram of a structure according to one or more embodiments.

[0035] Description of reference numerals: 1, box body; 101, accommodating cavity; 11, first shell; 111, first clamping portion; 12, second shell; 121, second clamping portion; 2, connecting portion; 21, root; 211, root body; 212, root wing; 22, end; 221, end body; 222, end wing; 23, reinforcement; 231, reinforcement body; 232, reinforcement end strip; 3, terminal; 4, external connection; 5, diode; 100, junction box; 200, solar cell module; 210, first board; 220, first adhesive layer; 230, busbar; 240, second adhesive layer; 250, second board. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application 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 present application. However, the present application 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 present application, so the present application is not limited by the specific embodiments of the following disclosed implementation methods.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "perpendicular", "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 application 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 application.

[0038] In the present application, 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”, and “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”, and “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.

[0039] In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. Exemplarily, a first external component may also be referred to as a second external component, and a second external component may also be referred to as a first external component. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In this application, unless otherwise clearly specified and limited, the terms "connected", "connected", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a flexible connection, or a rigid connection along at least one direction; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or directly connected with the presence of an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. The terms "install", "set", "fixed", etc. can be broadly understood as connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] The terms "layer" and "region" used in this application refer to a material portion that includes a certain area and has a certain thickness. The layer can extend horizontally, vertically and / or along a tapered surface. A layer can be an area of ​​a uniform or non-uniform continuous structure, and its thickness perpendicular to the extension direction may not be greater than the thickness of the continuous structure. A layer can include multiple layers, which can be multiple layers stacked or multiple layers extending discretely. The shapes of various areas and layers in the accompanying drawings and their relative sizes and positional relationships are only exemplary, and may actually deviate due to manufacturing tolerances or technical limitations, and the design can be adjusted according to actual needs.

[0042] refer to Figure 1 , Figure 1 The junction box in this application is shown. Figures 2 to 5 In an exemplary embodiment, the junction box 100 includes a box body 1, a connection portion 2, a connection terminal 3 and an external connection member 4. In order to be used in a solar cell panel, the junction box 100 may be provided with at least one pair of connection terminals 3, each pair of connection terminals 3 being electrically connected to a corresponding pair of positive and negative electrodes; then, the junction box 100 includes at least one pair of external connections 4, which are electrically connected to the pair of connection terminals 3. The connection structure between the connection terminals 3 and the external connection member 4 is provided in the box body 1. Figure 1 As shown, the junction box 100 may have only two connection terminals 3 and two external connection components 4, and the lengths of the two connection terminals 3 extending out of the box body 1 may be different.

[0043] For the convenience of description, a spatial rectangular coordinate system XYZ is established, wherein the Z-axis direction may be parallel to the first direction, the X-axis direction may be parallel to the second direction, and the Y-axis direction may be parallel to the third direction.

[0044] Combination Figure 2 and Figure 3 As shown, in some embodiments, each of the multiple connection parts 2 of the junction box 100 is fixed to the box body 1, and these connection parts 2 can be located on the same side of the box body 1, such as the lower side shown in the figure. When two wiring terminals 3 are provided, two connection parts 2 can be provided, and the wiring terminals 3 are arranged in the corresponding connection parts 2 along the first direction. Each connection part 2 is used to protect the corresponding wiring terminal 3. The connection part 2 and the box body 1 can be an integrally formed structure. Multiple wiring terminals 3 are arranged in parallel along the X-axis direction, and multiple connection parts 2 are arranged in parallel along the X-axis direction.

[0045] The connecting portion 2 extends away from the box body 1 along the Z-axis direction. Exemplarily, the length dimension of the connecting portion 2 ranges from 5 mm to 15 mm, such as 8 mm, 10 mm or 12 mm. The connecting portion 2 may include a root 21 close to the box body 1 and an end 22 away from the box body 1. Optionally, the length dimension L1 of the root 21 along the Z-axis direction and the length dimension of the end 22 may be substantially the same, for example, both are 5 mm. The root 21 may be a straight column structure. In the direction away from the box body 1, the outer contour of the cross section of the end 22 gradually expands; that is, in the Z-axis direction toward the box body 1, the outer contour of the cross section of the end 22 gradually shrinks. At different cross sections, the outer contour may be different throughout the entire circumference, or may be different only in some positions, such as on both sides along the X-axis direction.

[0046] refer to Figure 6 The present application provides a solar cell assembly 200, wherein a junction box 100 is installed on a solar cell panel of the solar cell assembly 200. The junction box 100 may be the aforementioned junction box 100, and optionally, Figure 6 The junction box 100 in may be Fig.13 and Fig.14 The junction box 100 shown in FIG. Figure 7 As shown, the solar cell panel of the solar cell assembly 200 includes a first panel 210, a first adhesive layer 220, a bus line 230, a second adhesive layer 240 and a second panel 250 stacked in sequence, wherein: Figure 7 The cross-section shown is not taken at the bus line 230. At a position other than the bus line 230, the first glue layer 220 and the second glue layer 240 may be integrated.

[0047] The solar panel also includes at least one cell, which is also located between the first adhesive layer 220 and the second adhesive layer 240. Multiple cells can be arranged in an XZ array, and multiple cells and the bus line 230 can form a circuit layer. The bus line 230 is used to electrically connect the cells and converge the current to the end position of the solar cell assembly 200.

[0048] The connection terminal 3 of the junction box 100 is electrically connected to the bus line 230. The connection sequence of the connection terminal 3 and the bus line 230 can be adjusted. Specifically, the connection terminal 3 and the bus line 230 can be welded; Figure 8 As shown, the end of the bus line 230 can also be bent to wrap around the connection terminal 3.

[0049] The connection part 2 is connected between the first adhesive layer 220 and the second adhesive layer 240. The connection part 2 can be located within the edge of the adhesive layer along the Z-axis direction, and a part of the adhesive layer is sunk between the end 22 and the box body 1, and also sunk between two adjacent connection parts 2. By setting the outer contour of the cross section of the end 22 in the connection part 2 to gradually expand, when the junction box 100 is subjected to an external force, the adhesive layer gives a resistance to the enlarged outer contour of the end in the opposite direction of the external force, thereby improving the connection strength. The junction box 100 has a high connection strength after being connected to the solar panel, which prevents the junction box 100 from loosening. After being used for a long time, it still has the ability to prevent falling off, thereby preventing the electrical connection of the terminal from failing.

[0050] The solar cell assembly 200 provided by the present application has good structural strength and stable and reliable working performance. The material of the connecting part 2 can be an insulating material, and the connecting part 2 can also have insulating properties to further protect the connecting terminal 3 and the bus line 230.

[0051] The present application provides a method for manufacturing a solar cell module, which may include the following steps. Laying a first adhesive layer 220 on a first plate 210; Laying a cell sheet on the first adhesive layer 220 and setting a busbar 230; Installing a junction box 100 so that the terminal 3 is electrically connected to the corresponding busbar; Laying a second adhesive layer 240, the second adhesive layer 240 and the first adhesive layer 220 clamp the connection part 2; Stacking a second plate 250; Forming a solar cell module 200 by lamination and hot melting. During the hot melting process, the second adhesive layer 240 and the first adhesive layer 220 can flow into the space formed by the multiple connection parts 2. While bonding the connection parts 2, the embedded fixation between the layer structures is also achieved, further improving the connection strength and stability between the junction box 100 and the solar panel. In addition, the solar panel also helps to improve the structural strength of the connection part 2 and the terminal 3, and reduce the deformation of the junction box 100 when subjected to a force along the Y-axis direction.

[0052] Optionally, the second adhesive layer 240 and the second plate 250 may also be stacked first. The junction box 100 may be placed before the bus line 230. The first plate 210 and the second plate 250 may both be glass plates or other types of light-transmitting plates.

[0053] refer to Figure 2 and Figure 5 , for example, the thickness dimension of the terminal 3 along the Y-axis direction may be 0.4 mm, and the width dimension along the X-axis direction may be 7 mm. The terminal 3 may be a metal sheet. The connecting portion 2 is thicker than the terminal 3, and then the single-side thickness of the connecting portion 2 relative to the terminal 3 may be greater than 0.4 mm. In general, the connecting portion 2 is also roughly a thin sheet structure, and the width dimension D2 of the end portion 22 along the second direction and the width dimension D1 of the root along the second direction may be greater than the thickness dimension H1 of the end portion 22 along the third direction, and the end portion 22 and the root 21 may be of equal thickness. The end portion 22 is thinner, and the junction box 100 can adapt to the solar panel and occupy a reasonable installation space.

[0054] Exemplarily, the thickness dimension H1 of the connection portion 2 along the Y-axis direction is relatively small, and may be smaller than 1.6 mm, such as 1.4 mm or 1.5 mm.

[0055] like Figure 3 As shown, the end portion 22 includes an end body 221 for arranging the connection terminal 3 and end side wings 222 located at both sides of the end body 221 along the second direction. Figure 3 In the embodiment, the end body 221 is roughly rectangular, and the two end side wings 222 are roughly right-angled trapezoids. Figure 5 As shown, the thickness of the end wing 222 is thinner at a location farther away from the end body 221. Figure 7 , the junction box 100 is connected to the solar panel, and the end 22 can fit the layer structure of the solar panel well, and can achieve a high connection strength with the layer structure to prevent the junction box 100 from falling off. Exemplarily, the cross section of the end wing 222 can be triangular.

[0056] When the thickness of the end portion 22 is substantially uniform, the change in the cross-sectional profile is also the change in the width. Figure 4 As shown, the width dimension D2 of the end 22 away from the box body 1 is greater than the width dimension D1 of the end close to the box body 1, the end of the end 22 away from the box body 1 may be the widest part of the end 22, and the end close to the box body 1 may be the narrowest part of the end 22, and may be the same as the width dimension of the root 21. The width change of the end 22 may be continuous, that is, the two side edges are straight lines, and the projection profile of the end 22 along the third direction is a trapezoid. In other embodiments, the two side edges of the end 22 may have a certain curvature or be several sections that are deflected from each other.

[0057] For example, Figure 4As shown, the angle θ between the side and the end of the end 22 is greater than 45°, and the specific range of θ can be 45° to 85°, for example, 60°, 68° or 75°. If the angle θ is greater than or equal to 90°, the junction box 100 is easy to fall out of the solar panel when subjected to external force; and by setting the angle θ to be less than or equal to 85°, it is possible to better ensure that the end wing 222 is combined with the adhesive layer. The deflection of the side relative to the Z-axis direction is not too large, so as to avoid the connection part 2 from being too wide, so that the layout of multiple connection parts 2 is compact, the size of the junction box 100 is small, and the production cost is low.

[0058] The width dimension D3 of the end body 221 can be half of the width dimension D2 of the end 22. For example, D3 and D2 satisfy 40%×D2≤D3≤90%×D2. If D3 is less than 40% of D2, the width ratio of the end body 221 is too small, and the end body 221 is the thickest part of the connection part 2. If the width ratio is too small, the stress is too concentrated during the lamination stage of the solar cell module 200, and the connection part 2 is easily damaged. If D3 is greater than 90% of D2, the width dimension of the end wing 222 is too small. On the one hand, the contact area between the end wing 222 and the adhesive layer is small, and the connection strength between the junction box 100 and the solar cell panel is low; on the other hand, in the cross section parallel to the XY plane, the thickness of the end wing 222 is reduced to a large extent, and the adhesive layer of at least one side of the first adhesive layer 220 and the second adhesive layer 240 is difficult to fit together, and the air inside is difficult to be discharged smoothly, and defects such as bubbles are easily generated during the lamination stage.

[0059] In one embodiment, for a 7 mm wide terminal 3, the width dimension D3 of the end body 221 is 8 mm, and the width dimension D4 of the two end wings 222 can be half of the width dimension D3 of the end body 221, that is, 4 mm, so that the width D2 of the end 22 is 16 mm.

[0060] In some embodiments, the distance S between two adjacent ends 22 is smaller than the width dimension D4 of the end wing 222, and the adhesive layer trapped therein can be better locked between the two adjacent ends 22. Exemplarily, the distance S is 1 mm to 2 mm. The distance S can be smaller than the deflection dimension of the side edge of the end wing 222 along the X-axis direction, or smaller than the difference between the widths of the two ends of the end wing 222, which is conducive to ensuring the contact area between the adhesive layer and the connecting part 2 with a compact structure, and can effectively ensure that the first adhesive layer 220 and the second adhesive layer 240 are completely in contact and fused between the two connecting parts 2.

[0061] The root 21 may include a root body 211 and root flanks 212. The root body 211 may be substantially of equal thickness, and the root flanks 212 are thinner as they are farther from the root body 211. The width dimension of the root 21 is also D1, for example, 12 mm.

[0062] like Figure 3 As shown, in some embodiments, the junction box 100 further includes at least one reinforcement portion 23, the reinforcement portion 23 is connected between the roots 21 of two adjacent connection portions 2, and the reinforcement portion 23 is fixed to the box body 1. The reinforcement portion 23 can improve the structural strength of each connection portion 2, and help to better limit and fix the connection terminal 3. The reinforcement portion 23 can be integrally formed with the root portion 21, and integrally formed with the box body 1.

[0063] like Figure 4 As shown, in some embodiments, the dimension L2 of the reinforcing portion 23 along the first direction is greater than half of the dimension L1 of the root 21, and the junction box 100 has good structural strength. Optionally, the reinforcing portion 23 can extend to the end 22 or further. Exemplarily, there can be a gap between the reinforcing portion 23 and the end 22, so that there is still a certain space between the roots 21 of two adjacent connecting portions 2, which can accommodate a part of the first adhesive layer 220 and the second adhesive layer 240, thereby ensuring the connection strength. Exemplarily, the dimension L2 of the reinforcing portion 23 along the first direction and the length dimension L1 of the root 21 satisfy: 50%×L1≤L2≤80%×L1.

[0064] The reinforcement part 23 may include a reinforcement part body 231 connected to the box body 1 and a reinforcement part end strip 232 located on the side of the reinforcement part body 231 facing away from the box body 1. The thickness of the reinforcement part body 231 may also be H1, and the part of the reinforcement part end strip 232 that is farther away from the reinforcement part body 231 is thinner. The reinforcement part body 231 is conducive to ensuring structural strength, and the gradually thinning design of the reinforcement part end strip 232 is conducive to the bonding of the adhesive layer, and helps to ensure good contact and fusion between the first adhesive layer 220 and the second adhesive layer 240 without bubbles. The junction box 100 can be well connected to the solar panel.

[0065] For example, the dimension of the reinforcement body 231 along the Z-axis direction is 1.5 mm and is substantially straight, and the dimension of the reinforcement end strip 232 is 2 mm. The width dimension of the root wing 212 along the X-axis direction may be 2 mm, the root wing 212 and the reinforcement end strip 232 may have the same slope, and the angle of the boundary line relative to the Z-axis direction may be 45°.

[0066] Combination Figure 2 and Figure 5 As shown, a plurality of connecting parts 2 can be arranged in a linear structure along the second direction. Figure 7 As shown, when the solar panel is a flat structure, the junction box 100 can adapt to the solar panel.

[0067] Along the Y-axis direction, the box body 1 is thicker than the connecting portion 2. For example, the size of the box body 1 along the Y-axis direction may be 8 mm, which can support the connecting portion 2. The thickness of the box body 1 may be comparable to the thickness of the solar panel, and the step difference between the two side surfaces of the box body 1 along the Y-axis direction and the two side surfaces of the solar panel may be less than 1 mm.

[0068] Exemplarily, the box body 1 is roughly in the shape of a cuboid. The box body 1 may include a first shell 11 and a second shell 12, and the first shell 11 and the second shell 12 may be detachably connected or fixed after installation. Figures 1 to 5 In the embodiment shown, the extension direction of the plurality of external components 4 is the same, which is along the X-axis direction. The splicing direction of the first shell 11 and the second shell 12 is along the Z-axis direction, which is perpendicular to the extension direction of the external components 4. Figure 3 The first shell 11 and the second shell 12 spliced ​​along the Z-axis direction facilitate the insertion of the terminal 3 into the first shell 11, and the two external components 4 can also be placed in the first shell 11 and connected to the corresponding terminal 3. The assembly method of the box body 1 is conducive to the installation and maintenance of the terminal 3 and the external components 4.

[0069] The junction box 100 further includes at least one diode 5 , which is electrically connected between two corresponding connection terminals 3 , and helps to protect the junction box 100 and the circuit formed by the solar cell assembly 200 .

[0070] refer to Fig. 9 and Fig.10 For example, the junction box 100 includes two connection terminals 3, and then two external connection members 4. Both external connection members 4 extend along the X-axis direction, specifically extending to both sides. The box body 1 includes a first shell 11 and a second shell 12. Fig. 9 The second shell 12 is flipped over to show that the surface shown is used to match the surface shown in the first shell 11. Fig.10 The first shell 11 and the second shell 12 are spliced ​​along the Y-axis direction, and the splicing direction is perpendicular to the extending direction of the external component 4.

[0071] The first shell 11 can be a groove, the second shell 12 can be a cover plate, and the connection terminal 3 and the external component 4 can be installed on the first shell 11. Both ends of the first shell 11 along the X-axis direction can be used to place the external component 4. After the second shell 12 is spliced, the box body 1 is sleeved on the external component 4.

[0072] The junction box 100 further includes a diode 5 , which is disposed in the accommodating cavity 101 of the box body 1 and is electrically connected between the two connection terminals 3 .

[0073] refer to Fig.11 and Fig.12In some embodiments, the junction box 100 includes four wiring terminals 3 and four external connectors 4. The four wiring terminals 3 are arranged in a row along the X-axis direction, and the four wiring terminals 3 are substantially straight. The external connectors 4 extend along the Z-axis direction and are connected to the wiring terminals 3 one by one. The first shell 11 of the box body 1 can be a groove, and the second shell 12 can be a cover plate, and the two are spliced ​​along the Y-axis direction. The side wall of the first shell 11 along the Z-axis direction can be provided with a through hole, and the external connector 4 is inserted into the corresponding through hole.

[0074] Exemplarily, the first shell 11 includes a first clamping portion 111, and the second shell 12 includes a second clamping portion 121. The first clamping portion 111 may be two protrusions opposite to each other on both sides of the groove, and the second clamping portion 121 may be a convex block, which has a clamping groove on both sides along the Z-axis direction. The first shell 11 and the second shell 12 can be clamped, and a good clamping strength is achieved with a compact structure. In the junction box 100, two pairs of wiring terminals 3 can be divided, and a pair of wiring terminals 3 are insulated, and a diode may not be provided.

[0075] refer to Fig.13 and Fig.14 In some embodiments, the junction box 100 includes two connection terminals 3 and two external connection members 4, and the external connection members 4 can extend along the Z-axis direction and be connected to the corresponding connection terminals 3. The box body 1 can include a first shell 11 and a second shell 12, and the connection terminals 3 and the external connection members 4 can be installed in the first shell 11, and the second shell 12 can be spliced ​​to the first shell 11 along the Y-axis direction.

[0076] refer to Fig.15 and Fig.16 In some embodiments, the junction box 100 includes six terminals 3 and six external connectors 4. The six terminals 3 may be arranged substantially straight along the X-axis direction, and may be divided into three pairs of terminals 3 arranged in sequence. The external connectors 4 extend along the Z-axis direction and are connected to the corresponding terminals 3. Exemplarily, the first shell 11 and the second shell 12 of the box body 1 are spliced ​​along the Y-axis direction. The first shell 11 may be connected to six connection portions 2 and five reinforcement portions 23.

[0077] refer to Fig.17 , Fig.18 and Fig.19 The junction box 100 may include two terminals 3 and two external connectors 4, and the terminals 3 and the external connectors 4 both extend along the Z-axis direction. The two terminals 3 are arranged along the X-axis direction and form an arc-shaped structure. Exemplarily, the box body 1 also has an arc-shaped structure in the XY plane. The junction box 100 can be adapted to the solar cell assembly 200 of a curved photovoltaic assembly type such as a cylindrical tile assembly.

[0078] The first shell 11 of the box body 1 includes a first clamping portion 111, and multiple first clamping portions 111, for example four, can be arranged around the notch of the first shell 11; the second shell 12 includes multiple second clamping portions 121, and three protrusions can be arranged by slotting the side of the protrusion to match the first clamping portions 111 at corresponding positions, and the middle protrusion can match the two first clamping portions 111 opposite to each other along the Z-axis direction.

[0079] refer to Fig.18 The reinforcing portion body 231 is also an arc-shaped structure, and its size along the Z-axis direction changes. The middle of the reinforcing portion body 231 is narrower than the two sides, which is conducive to matching the first adhesive layer 220 and the second adhesive layer 240.

[0080] In an exemplary embodiment, the projection profile of the end body 221 along the third direction is a trapezoid. The shape of the end wing 222 can be a parallelogram, and the end wing 222 has a certain slope along the Z-axis direction. The end body 221 can further limit the adhesive layer recessed at the end wing 222. The adhesive layer trapped between the end 22 and the box body 1 has a high connection strength with the connecting part 2.

[0081] refer to Fig. 20 , Fig.21 and Fig. 22 The junction box 100 may include four terminals 3 and four external parts 4. The four terminals 3 are arranged along the X-axis direction and form an arc structure. The external parts 4 extend along the Z-axis direction and are connected to the corresponding terminals 3. The box body 1 includes a first shell 11 and a second shell 12 spliced ​​along the Y-axis direction. The box body 1 has an arc shape with substantially equal thickness in the XY plane. The box body 1 is provided with four connecting parts 2 and three reinforcing parts 23. Fig.21 , the size of the middle position of the reinforcing portion main body 231 of the reinforcing portion 23 along the Z-axis direction is smaller. The projection profile of the end body 221 along the Y-axis direction may be a trapezoid.

[0082] refer to Fig.23 and Fig.24 The junction box 100 may include six connection terminals 3 and six external connection parts 4. The six connection terminals 3 are arranged along the X-axis direction and form an arc-shaped structure, and the external connection parts 4 extend along the Z-axis direction and are connected to the corresponding connection terminals 3. The external connection parts 4 and the connection terminals 3 are both arranged in the first shell 11, and the second shell 12 can be an arc-shaped cover plate. The box body 1 has an arc-shaped shape with substantially equal thickness in the XY plane, and the box body 1 is easy to manufacture and assemble. The first shell 11 can be provided with six connecting parts 2 and five reinforcing parts 23, and the projection profile of the end body 221 can be a trapezoid.

[0083] The junction box 100 of the present application may include multiple pairs of connection terminals 3, and the spacing between the connection terminals 3 may be the same or different. According to the configuration of the busbar 230 in the solar cell assembly 200, the required number of connection terminals 3 may be designed.

[0084] The technical features of the embodiments disclosed above can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above 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.

[0085] In the embodiments disclosed above, unless otherwise clearly specified and limited, the execution order of each step is not limited, for example, it can be executed in parallel, or it can be executed successively in different orders. The sub-steps of each step can also be executed alternately. The above-mentioned various forms of processes can be used, and steps can be reordered, added or deleted. As long as the desired results of the technical solution provided by the application can be achieved, the application is not limited here.

[0086] The embodiments disclosed above only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of patent protection of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the scope of patent protection required by the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A junction box, characterized in that: include: Box body; A plurality of connecting parts, the connecting parts are fixed to the box body and extend away from the box body along a first direction, the plurality of connecting parts are arranged in parallel along a second direction perpendicular to the first direction, the connecting parts include a root portion close to the box body and an end portion away from the box body, wherein the outer contour of the cross section of the end portion gradually expands along the direction away from the box body; a plurality of connection terminals, wherein the connection terminals are arranged in the corresponding connection parts along the first direction; and A plurality of external connection components are arranged on the box body and are electrically connected to the plurality of connection terminals in a one-to-one correspondence.

2. The junction box according to claim 1, characterized in that: A width dimension of the end portion along the second direction is greater than a thickness dimension of the end portion along a third direction, and the third direction is perpendicular to the first direction and perpendicular to the second direction.

3. The junction box according to claim 2, characterized in that: The end portion includes an end body for arranging the connection terminal and end side wings located at both sides of the end body along the second direction, and the thickness of the end side wings is thinner at a position farther away from the end body.

4. The junction box according to claim 3, characterized in that: The projection profile of the end portion along the third direction is a trapezoid; A projection profile of the end body along the third direction is a trapezoid.

5. The junction box according to claim 3, characterized in that: The distance between two adjacent ends ranges from 1 mm to 2 mm; The width dimension D3 of the end body and the width dimension D2 of the end satisfy: 40%×D2≤D3≤90%×D2; or / and An included angle θ between the side of the end portion and the end of the end portion ranges from 45° to 85°.

6. The junction box according to claim 1, characterized in that: It also includes at least one reinforcing portion, which is connected between the roots of two adjacent connecting portions and is fixed to the box body.

7. The junction box according to claim 6, characterized in that: A dimension of the reinforcing portion along the first direction is greater than half of a dimension of the root portion, and a gap is provided between the reinforcing portion and the end portion.

8. The junction box according to claim 1, characterized in that: The plurality of connection portions are arranged in a straight line structure or an arc line structure along the second direction.

9. The junction box according to any one of claims 1 to 8, characterized in that: The multiple external components extend in the same direction; The box body comprises a first shell and a second shell, and a splicing direction of the first shell and the second shell is perpendicular to an extending direction of the external component.

10. A solar cell module, characterized in that: include: The junction box according to any one of claims 1 to 9; as well as A solar cell panel comprises a first plate, a first adhesive layer, a bus line, a second adhesive layer and a second plate stacked in sequence, wherein the connection portion of the junction box is connected between the first adhesive layer and the second adhesive layer, and the connection terminal is electrically connected to the bus line.

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