Photovoltaic module junction box

Abstract

The utility model relates to a photovoltaic assembly junction box. The photovoltaic assembly junction box comprises a box body and a bypass protection assembly arranged in the box body. The box body comprises a top wall, a bottom wall and a side wall adjacent between the top wall and the bottom wall; a plurality of first rib-shaped structures which are arranged at intervals are arranged on the inner surfaces, facing the interior of the box body, of the side walls, the first rib-shaped structures extend in the first direction, and the extension size H1 of the first rib-shaped structures in the first direction and the size H0 of the box body in the first direction meet the condition that 0.7 H0 is smaller than or equal to H1. The photovoltaic assembly junction box provided by the utility model is high in safety.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a photovoltaic component junction box. Background Art

[0002] The photovoltaic junction box is one of the key accessories of photovoltaic modules, which is responsible for transmitting the current generated by the batteries in the photovoltaic modules. One or more bypass diodes are usually set in the photovoltaic junction box to play the role of bypass protection, avoiding the hot spot effect of photovoltaic modules, resulting in loss of power generation efficiency and module safety risks. After the photovoltaic junction box is manufactured, it must pass the junction temperature test. However, after the standard junction temperature test of existing photovoltaic junction box products, the side walls of the junction box are prone to deformation, which affects the sealing performance, flame retardancy, insulation performance, etc. of the photovoltaic junction box, making the safety of the photovoltaic junction box reduced. Utility Model Content

[0003] Based on this, it is necessary to provide a photovoltaic junction box with higher safety.

[0004] The embodiment of the present application provides a photovoltaic assembly junction box, including a box body and a bypass protection assembly disposed in the box body;

[0005] The box body includes a top wall, a bottom wall, and a side wall adjacent to the top wall and the bottom wall;

[0006] A plurality of first rib-like structures are arranged at intervals on the inner surface of the side wall facing the box body. The first rib-like structures extend along a first direction, and an extension dimension H1 of the first rib-like structures along the first direction and a dimension H0 of the box body along the first direction satisfy:

[0007] 0.7H0≤H1;

[0008] The first direction is a direction from the top wall to the bottom wall.

[0009] In one embodiment, a plurality of second rib-like structures are arranged at intervals on the outer surface of the side wall facing the outer body of the box; the second rib-like structures extend along the first direction, and the extension dimension H2 of the second rib-like structures along the first direction and the dimension H0 of the box body along the first direction satisfy:

[0010] 0.7H0≤H2.

[0011] In one embodiment, the outer contour of the cross section of the first rib-like structure along the first direction is semicircular, triangular or rectangular, and the first rib-like structure is constructed as a long strip structure extending from the bottom wall toward the top wall.

[0012] In one embodiment, the side wall includes two first side walls extending along the second direction and spaced apart along the third direction;

[0013] The first rib-like structure and the second rib-like structure are both formed on the first side wall;

[0014] A plurality of first rib-like structures are arranged at intervals along the second direction, and a plurality of second rib-like structures are arranged at intervals along the second direction;

[0015] The second direction and the third direction are perpendicular to the first direction in pairs, and the size of the box body along the second direction is greater than the size of the box body along the third direction.

[0016] In one embodiment, the bypass protection component includes a first connecting piece and a second connecting piece that are spaced apart, a diode chip, a plastic packaging structure, and a jumper;

[0017] The cathode of the diode chip is electrically connected to the second connecting piece, and the anode of the diode chip is electrically connected to the first connecting piece through a jumper. The plastic packaging structure covers the diode chip, the jumper, and the junction between the first connecting piece and the second connecting piece.

[0018] In one embodiment, the distance between the plastic package structure and the inner surface of the side wall is greater than 0.5 mm.

[0019] In one embodiment, the first connecting piece and the second connecting piece are arranged at intervals along the second direction;

[0020] A first concave structure is provided at two side ends of the first connecting piece along the third direction at positions corresponding to the plastic packaging structure; a second concave structure is provided at two side ends of the second connecting piece along the third direction at positions corresponding to the plastic packaging structure;

[0021] The plastic packaging structure is located in the first recessed structure and the second recessed structure so that the surface of the plastic packaging structure along the third direction is flush with the surfaces of the first connecting piece and the second connecting piece along the third direction; the second direction and the third direction are perpendicular to the first direction.

[0022] In one embodiment, the bottoms of the first recessed structure and the second recessed structure are configured as high and low undulating structures.

[0023] In one embodiment, the jumper is constructed as a jumper sheet, and the area of ​​the jumper in the straight state is 33-49.5mm 2 .

[0024] In one embodiment, the jumper is constructed as a jumper sheet, and the thickness of the jumper is 0.25-0.5 mm.

[0025] The beneficial effects of the above photovoltaic module junction box are:

[0026] By providing a plurality of first rib-like structures arranged at intervals on the inner surface of the side wall facing the box body, the thickness of the side wall is increased to a certain extent, the deformation resistance of the side wall is enhanced, the side wall is not easy to deform, and the sealing performance, flame retardancy and insulation performance of the photovoltaic junction box are not affected, so that the photovoltaic junction box has a higher safety. At the same time, the first rib-like structure is provided on the inner surface of the side wall, and compared with not providing the rib-like structure, the area of ​​the inner surface of the side wall is increased, the contact surface for heat conduction per unit time is increased, and the thermal conductivity efficiency is improved.

[0027] Since the extension dimension H1 of the first rib-like structure along the first direction and the dimension H0 of the box body along the first direction satisfy: 0.7H0≤H1, more than 70% of the area of ​​the side wall along the first direction can be thickened, which can effectively improve the mechanical strength and heat resistance of the side wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a schematic diagram of the structure of a photovoltaic module junction box provided in an embodiment of the present application;

[0029] FIG2 is a schematic diagram of a top view of a photovoltaic module junction box provided in an embodiment of the present application;

[0030] FIG3 is a schematic diagram of a top view of another structure of a photovoltaic module junction box provided in an embodiment of the present application;

[0031] FIG4 is a schematic diagram of the structure of a bypass protection component in a photovoltaic module junction box provided in an embodiment of the present application;

[0032] FIG. 5 is a side view of FIG. 4 .

[0033] Description of Figure Numbers:

[0034] 100. Photovoltaic module junction box;

[0035] 10. Box body; 11. Top wall; 12. Bottom wall; 13. Side wall;

[0036] 20. first tendon-like structure; 30. second tendon-like structure;

[0037] 50. Bypass protection component;

[0038] 51. first connecting piece; 511. first recessed structure; 52. second connecting piece; 521. second recessed structure; 53. diode chip; 54. jumper wire; 55. plastic package structure;

[0039] F, first direction; S, second direction; T, third direction. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0043] 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.

[0044] 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.

[0045] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0046] The following is a description of the photovoltaic module junction box of the embodiment of the present application in conjunction with the accompanying drawings. It should be noted that the photovoltaic module junction box in the present application is used to transmit the current generated by the solar cells in the photovoltaic module. In the embodiment of the present application, the bypass protection component in the photovoltaic module junction box generally can include a diode chip, that is, a bypass diode, to avoid the hot spot effect of the photovoltaic module, resulting in loss of power generation efficiency and component safety risks.

[0047] Figure 1 is a schematic diagram of the structure of a photovoltaic module junction box provided in an embodiment of the present application; Figure 2 is a schematic diagram of the top view of the structure of a photovoltaic module junction box provided in an embodiment of the present application; Figure 3 is a schematic diagram of the top view of another structure of a photovoltaic module junction box provided in an embodiment of the present application; Figure 4 is a schematic diagram of the structure of a bypass protection component in a photovoltaic module junction box provided in an embodiment of the present application; and Figure 5 is a side view of Figure 4.

[0048] 1, 2 and 4, in the embodiment of the present application, the photovoltaic module junction box 100 includes a box body 10 and a bypass protection component 50 disposed in the box body 10. In FIG1, in order to clearly show the first rib-like structure 20, the bypass protection component 50 is omitted and is not shown.

[0049] The box body 10 includes a top wall (not shown), a bottom wall 12, and a side wall 13 adjacent to the top wall and the bottom wall 12. A plurality of first rib-like structures 20 arranged at intervals are provided on the inner surface of the side wall 13 facing the inside of the box body 10. The first rib-like structures 20 extend along a first direction F, and an extension dimension H1 of the first rib-like structures 20 along the first direction F and a dimension H0 of the box body 10 along the first direction F satisfy:

[0050] 0.7H0≤H1; wherein the first direction F is the direction from the top wall to the bottom wall 12. Of course, H1 may also be less than or equal to H0.

[0051] A plurality of first rib-like structures 20 are arranged at intervals on the inner surface of the side wall 13 facing the box body 10. Since the thickness of the side wall 13 is increased to a certain extent, the deformation resistance of the side wall 13 is enhanced, the side wall 13 is not easy to deform, and will not affect the sealing performance, flame retardant performance and insulation performance of the photovoltaic junction box, so that the photovoltaic junction box has higher safety.

[0052] At the same time, a first rib-like structure 20 is provided on the inner surface of the side wall 13. Compared with the case where no rib-like structure is provided, the inner surface area of ​​the side wall 13 is increased, the contact surface for heat conduction per unit time is increased, and the heat conduction efficiency is also improved.

[0053] Since the extension dimension H1 of the first rib-like structure 20 along the first direction F and the dimension H0 of the box body 10 along the first direction F satisfy: 0.7H0≤H1, more than 70% of the area of ​​the side wall 13 along the first direction F can be thickened, which can effectively improve the mechanical strength and heat resistance of the side wall 13.

[0054] In the embodiment of the present application, referring to FIG. 3 , in other embodiments, a plurality of second rib-like structures 30 arranged at intervals are provided on the outer surface of the side wall 13 facing the outside of the box body 10 , and the second rib-like structures 30 extend along the first direction F, and the extension dimension H2 of the second rib-like structures 30 along the first direction F and the dimension H0 of the box body 10 along the first direction F satisfy:

[0055] 0.7H0≤H2. With such a configuration, each second rib-like structure 30 can also achieve the best effect of reinforcing the strength of the outer surface of the side wall 13. Of course, H2 can also be less than or equal to H0.

[0056] In a specific implementation, the cross section of the second rib-like structure 30 along the first direction F may be a rectangle or other shapes, and the second rib-like structure 30 is constructed as a long strip-shaped structure extending from the bottom wall 12 along the first direction F toward the top wall.

[0057] In addition, the provision of the second rib-like structure 30 can also increase the heat dissipation area of ​​the outer surface of the side wall 13 , assist the side wall 13 of the box body 10 in heat dissipation, and also improve the mechanical strength of the side wall 13 .

[0058] In the embodiment of the present application, the outer contour of the cross section of the first rib-like structure 20 along the first direction F is semicircular, triangular or rectangular, and the first rib-like structure 20 is configured as a long strip structure extending from the bottom wall 12 toward the top wall. The number of the first rib-like structures 20 can be selected according to actual needs. It should be noted that the outer contour shape of the first rib-like structure 20 can also be set to other curved shapes as needed.

[0059] In a specific implementation, each first rib-like structure 20 points from the top wall to the bottom wall 12 , and the outer contour size of the cross section along the first direction F gradually decreases. In this way, the closer the position on the side wall 13 is to the bottom wall 12 , the higher the strength.

[0060] When the cross section is semicircular, the surface area of ​​the first rib-like structure 20 is the largest, the heat dissipation is the best, and the reinforcement of the structural strength is also the best.

[0061] For the convenience of explanation, a first direction F, a second direction S, and a third direction T are defined which are perpendicular to each other, and the dimension of the box body 10 along the second direction F is greater than the dimension of the box body 10 along the third direction T. In specific implementation, the first direction F is the height direction of the box body 10, the second direction S is the length direction of the box body 10, and the third direction T is the width direction of the box body 10.

[0062] Further, the side wall 13 includes two first side walls extending along the second direction S and arranged at intervals along the third direction T. The first rib-like structure 20 and the second rib-like structure 30 are both formed on the first side wall.

[0063] The plurality of first rib-like structures 20 are arranged along the second direction S at intervals, and the plurality of second rib-like structures 30 are arranged along the second direction S at intervals.

[0064] Since the longitudinal side wall of the box body 10, i.e. the first side wall, is relatively long and is the weakest position on the box body 10, the first rib-like structure 20 and the second rib-like structure 30 are provided on the first side wall 13 of the box body to maximize the strength of the box body 10.

[0065] In the embodiment of the present application, as shown in FIG. 4 and FIG. 5 , the bypass protection component 50 includes a first connecting piece 51 and a second connecting piece 52 that are spaced apart, a diode chip 53 , a plastic packaging structure 55 and a jumper 54 .

[0066] The cathode of the diode chip 53 is electrically connected to the second connecting piece 52, and the anode of the diode chip 53 is electrically connected to the first connecting piece 51 through the jumper 54. The plastic packaging structure 55 covers the diode chip 53, the jumper 54, and the junction between the first connecting piece 51 and the second connecting piece 52. This arrangement facilitates the electrical connection between the diode chip 53 and the external circuit.

[0067] In the embodiment of the present application, the distance between the plastic packaging structure 55 and the inner surface of the side wall 13 is greater than 0.5 mm.

[0068] The distance between the plastic packaging structure 55 and the inner surface of the side wall 13 is greater than 0.5 mm in order to increase the distance from the heat source to the side wall 13 and reduce the thermal shock to the side wall 13. The distance between the plastic packaging structure 55 and the inner surface of the side wall 13 is preferably 1.5 mm.

[0069] In the embodiment of the present application, the first connecting piece 51 and the second connecting piece 52 are arranged at intervals along the second direction S. The first connecting piece 51 has a first recessed structure 511 at two side ends along the third direction T corresponding to the position of the plastic packaging structure 55. The second connecting piece 52 has a second recessed structure 521 at two side ends along the third direction T corresponding to the position of the plastic packaging structure 55.

[0070] The plastic encapsulation structure 55 is located in the first recessed structure 511 and the second recessed structure 521 so that the surface of the plastic encapsulation structure 55 along the third direction T is flush with the surfaces of the first connecting piece 51 and the second connecting piece 52 along the third direction T; the second direction S, the third direction T and the first direction F are perpendicular to each other.

[0071] With such configuration, the distance between the plastic packaging structure 55 and the side wall 13 can be increased without affecting the areas of the first connecting piece 51 and the second connecting piece 52 as much as possible, so as to reduce the thermal shock to the side wall 13 .

[0072] In addition, in some other embodiments, no depressions may be provided on the first connecting sheet 51 and the second connecting sheet 52, and the overall dimensions of the first connecting sheet 51 and the second connecting sheet 52 along the third direction T may be reduced. Although the surface of the plastic encapsulation structure 55 along the third direction T protrudes beyond the surfaces of the first connecting sheet 51 and the second connecting sheet 52 along the third direction T, due to the reduction in the dimensions of the first connecting sheet 51 and the second connecting sheet 52, the distance between the plastic encapsulation structure 55 and the side wall 13 may still be increased.

[0073] Furthermore, the bottoms of the first recessed structure 511 and the second recessed structure 521 are configured as a high-low undulating structure, so as to improve the connection strength between the plastic packaging structure 55 and the first connecting sheet 51 and the second connecting sheet 52 .

[0074] In the embodiment of the present application, the jumper 54 is constructed as a jumper sheet, and the area of ​​the jumper 54 in the straight state is 33-49.5mm 2 .

[0075] In this way, the area of ​​the jumper 54 is set as large as possible, which can improve the heat conduction efficiency and make the heat dissipation performance better. The area of ​​the jumper 54 in the straight state can be 33mm 2 、34.65mm 2 、36.3mm2 、39.6mm 2 、41.25mm 2 、42.9mm 2 , or 49.5mm 2 .

[0076] Furthermore, the thickness of the jumper wire 54 may be 0.25-0.5 mm.

[0077] Such a configuration can improve the heat conduction efficiency, make the heat dissipation performance better, and also improve the conductivity. The thickness of the jumper 54 can preferably be 0.25mm, 0.3mm, 0.35mm, 0.4mm, or 0.5mm.

[0078] In the embodiment of the present application, in order to further improve the mechanical strength of the box body 10, the process of forming the box body by injection molding is also improved.

[0079] The process of making the box body includes:

[0080] Step 1: Inject liquid molding material into the mold.

[0081] Step 2: Maintain pressure in two stages. Adjust the pressure of one stage to 95bar-105bar, or adjust the duration of one stage to 4s.

[0082] Adjust the second stage holding pressure to 82bar-85bar, or adjust the second stage holding time to 3s.

[0083] By adopting a two-stage pressure-maintaining method, the surface of the box body 10 can be made smoother without defects such as pits, and some stress of the product can be released. In addition, the pressure of the first stage of pressure-maintaining is increased by 5-15 bar compared with the prior art, and the pressure of the second stage of pressure-maintaining is increased by 2-5 bar compared with the prior art, so that the mechanical strength of the box body 10 after molding is higher.

[0084] It should be noted that during the first and second stage pressure holding processes, the first and second stage pressure holding pressures can be increased at the same time, the first stage pressure holding time is maintained at the existing 3s, and the second stage pressure holding time is maintained at the existing 2s.

[0085] Alternatively, during the first and second pressure holding processes, the first pressure holding pressure can be maintained at the existing 90 bar, and the second pressure holding pressure can be maintained at the existing 80 bar, and at the same time, the first pressure holding time can be adjusted to 4 seconds, and the second pressure holding time can be adjusted to 3 seconds.

[0086] In other words, the holding time and holding pressure cannot be adjusted at the same time.

[0087] Step 3: Cooling and forming.

[0088] The inventor of the present application also conducted experiments to verify the size of the first rib-like structure 20 of the box body 10 along the first direction F, the cross-sectional shape, the injection molding parameters of the box body 10, and the different values ​​of the jumper thickness and area. The IEC62790 junction temperature test 25A-1H and 31.25A-1H were conducted, and the test results are shown in Table 1, Table 2, and Table 3 below:

[0089] First, the size and cross-sectional shape of the first rib-shaped structure 20 of the box body 10 along the first direction F are changed to obtain the test results shown in Table 1 below:

[0090] Table 1:

[0091]

[0092] It can be seen from Table 1 that when the dimension of the first rib-like structure 20 along the first direction F accounts for more than or equal to 70% of the dimension of the box body 10 along the first direction F, the side wall of the box body 10 will not deform, and the mechanical strength of the box body 10 is relatively high.

[0093] Next, the area and thickness of the jumper 54 are changed to obtain the test results shown in Table 2 below:

[0094] Table 2:

[0095]

[0096] From Table 2, we can see that the area of ​​the jumper in the straight state is 33-49.5mm 2 , or when the thickness of the jumper wire is 0.25-0.5 mm, the side wall of the box body 10 will not be deformed, and the mechanical strength of the box body 10 is relatively high.

[0097] The process parameters in the injection molding process of the box body 10 were changed again to obtain the test results in Table 3 below: Among them, in the prior art, on the basis of a first-stage holding pressure of 90 bar and a second-stage holding pressure of 80 bar, Section 1: No adjustment means that on the basis of the prior art, the first-stage holding pressure remains unchanged, and Section 2: No adjustment means that on the basis of the prior art, the second-stage holding pressure remains unchanged. Section 1: +5 bar means that the first-stage holding pressure is +5 bar on the basis of the existing first-stage holding pressure. The situations of Section 1: +10 bar and Section 1: +15 bar are similar to this and will not be repeated here. Section 2: +2 bar means that the second-stage holding pressure is +2 bar on the basis of the existing second-stage holding pressure. The situations of Section 2: +10 bar, Section 2: +5 bar, Section 2: +3 bar, are similar to this and will not be repeated here.

[0098] Among them, based on the existing technology that the first stage holding time is 3s and the second stage holding time is 2s, the first stage holding time: no adjustment means that on the basis of the existing technology, the first stage holding time remains unchanged. The second stage holding time: no adjustment means that on the basis of the existing technology, the second stage holding time remains unchanged. The first stage holding time: +1s means that the first stage holding time is +1s based on the existing first stage holding time. And the second stage holding time: +1s means that the second stage holding time is +1s based on the existing second stage holding time.

[0099] Table 3:

[0100]

[0101] It can be seen from Table 1 that the first-stage pressure holding time and the second-stage pressure holding time meet the following conditions: when the first-stage pressure holding time is adjusted to 4s and the second-stage pressure holding time is adjusted to 3s, the side wall of the box body 10 will not be deformed, the mechanical strength of the box body 10 is high, and the size of the box body 10 is normal.

[0102] Or the first-stage holding pressure and the second-stage holding pressure meet: when the first-stage holding pressure is adjusted to 95bar-105bar and the second-stage holding pressure is adjusted to 82bar-85bar, the side wall of the box body 10 will not be deformed, the mechanical strength of the box body 10 is high, and the size of the box body 10 is normal.

[0103] 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.

[0104] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which 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 photovoltaic module junction box, characterized in that: It comprises a box body and a bypass protection component arranged in the box body; The box body comprises a top wall, a bottom wall, and a side wall adjacent to the top wall and the bottom wall; A plurality of first rib-like structures are arranged at intervals on the inner surface of the side wall facing the box body, the first rib-like structures extend along a first direction, and an extension dimension H1 of the first rib-like structures along the first direction and a dimension H0 of the box body along the first direction satisfy: 0.7H0≤H1; Wherein, the first direction is the direction from the top wall to the bottom wall.

2. The photovoltaic module junction box according to claim 1, characterized in that: A plurality of second rib-like structures are arranged at intervals on the outer surface of the side wall facing the outer body of the box; the second rib-like structures extend along the first direction, and an extension dimension H2 of the second rib-like structures along the first direction and a dimension H0 of the box body along the first direction satisfy: 0.7H0≤H2.

3. The photovoltaic module junction box according to claim 2, characterized in that: The side wall includes two first side walls extending along the second direction and arranged at intervals along the third direction; The first rib-like structure and the second rib-like structure are both formed on the first side wall; A plurality of the first rib-like structures are arranged at intervals along the second direction, and a plurality of the second rib-like structures are arranged at intervals along the second direction; The second direction and the third direction are perpendicular to the first direction in pairs, and a dimension of the box body along the second direction is greater than a dimension of the box body along the third direction.

4. The photovoltaic module junction box according to claim 1, characterized in that: The outer contour of the cross section of the first rib-like structure along the first direction is semicircular, triangular or rectangular, and the first rib-like structure is configured as a long strip structure extending from the bottom wall toward the top wall.

5. The photovoltaic module junction box according to any one of claims 1 to 4, characterized in that: The bypass protection component includes a first connecting piece and a second connecting piece which are arranged at intervals, a diode chip, a plastic packaging structure and a jumper; The cathode of the diode chip is electrically connected to the second connecting piece, the anode of the diode chip is electrically connected to the first connecting piece through the jumper, and the plastic packaging structure covers the diode chip, the jumper, and the junction between the first connecting piece and the second connecting piece.

6. The photovoltaic module junction box according to claim 5, characterized in that: The distance between the plastic packaging structure and the inner surface of the side wall is greater than 0.5 mm.

7. The photovoltaic module junction box according to claim 5, characterized in that: The first connecting piece and the second connecting piece are arranged at intervals along the second direction; The first connecting piece has two side ends along the third direction and a first recessed structure at positions corresponding to the plastic packaging structure; the second connecting piece has two side ends along the third direction and a second recessed structure at positions corresponding to the plastic packaging structure; The plastic encapsulation structure is located in the first recessed structure and the second recessed structure so that the surface of the plastic encapsulation structure along the third direction is flush with the surfaces of the first connecting piece and the second connecting piece along the third direction; the second direction and the third direction are perpendicular to the first direction in pairs.

8. The photovoltaic module junction box according to claim 7, characterized in that: The bottoms of the first recessed structure and the second recessed structure are configured as a high-low undulating structure.

9. The photovoltaic module junction box according to claim 5, characterized in that: The jumper is constructed as a jumper sheet, and the area of ​​the jumper in a straightened state is 33-49.5 mm2.

10. The photovoltaic module junction box according to claim 5, characterized in that: The jumper is constructed as a jumper sheet, and the thickness of the jumper is 0.25-0.5 mm.

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