Photovoltaic junction box and photovoltaic module

Abstract

The utility model relates to the field of photovoltaic technology, and provides a photovoltaic junction box and a photovoltaic assembly, and the photovoltaic junction box comprises a photovoltaic junction box body and a sealing part. A groove is formed in the bottom surface of the photovoltaic junction box body, a bus bar connecting hole is formed in the bottom of the groove, and a bus bar of the solar module penetrates through the bus bar connecting hole; the sealing component comprises a water-blocking sealant, the water-blocking sealant is at least partially filled in the groove, the water-blocking sealant is provided with a via hole corresponding to the bus bar connecting hole, and the water-blocking sealant is used for injection molding in a sealed space enclosed by the bus bar and the side wall of the groove. The waterproof sealant is formed in the sealed space defined by the bus bar and the side wall of the groove in an injection molding mode, sealing and waterproofing are conducted on the connecting portion between the photovoltaic junction box and the solar module, the service life of the photovoltaic module is prolonged, and the defect that in the prior art, battery grid lines of the photovoltaic module are prone to corrosion and oxidation, and consequently the service life of the module is shortened is overcome.

Description

Technical Field

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

[0002] With the increasingly severe global climate change and environmental pollution problems, the green renewable energy industry has developed rapidly. Solar energy is a renewable resource, and the solar cell technology that uses the photovoltaic effect for power generation has attracted much attention from the world. A solar cell is made of materials that can generate the photovoltaic effect, such as silicon, gallium arsenide, copper indium selenide, etc., and can convert light energy into electrical energy. At present, photovoltaic modules composed of multiple solar cells are widely used to build various photovoltaic power generation systems, or are used as building facades to build energy-saving and environment-friendly buildings.

[0003] In the prior art, when a photovoltaic module is used in humid areas, such as tropical rainforests, the sea surface, and the lake surface, the battery grid lines of the photovoltaic module are easily corroded and oxidized, resulting in a decrease in the power of the photovoltaic module and further shortening the service life of the photovoltaic module. Summary of the Utility Model

[0004] The utility model provides a photovoltaic junction box and a photovoltaic module to solve the defect that the battery grid lines of the photovoltaic module in the prior art are easily corroded and oxidized, resulting in the shortening of the service life of the photovoltaic module.

[0005] The utility model provides a photovoltaic junction box, which is adapted to a solar module. The photovoltaic junction box includes:

[0006] A photovoltaic junction box body, a groove is formed in the bottom surface of the photovoltaic junction box body, a bus bar connection hole is formed in the bottom of the groove, and the bus bar of the solar module penetrates through the bus bar connection hole;

[0007] A sealing member, including a water-blocking sealant. The water-blocking sealant at least partially fills the groove. The water-blocking sealant has a through-hole corresponding to the bus bar connection hole, and the water-blocking sealant is used for injection molding in the sealing space formed by the bus bar and the side wall of the groove.

[0008] According to the photovoltaic junction box provided by the utility model, the water-blocking sealant has an extending portion extending out of the groove.

[0009] According to the photovoltaic junction box provided by the utility model, the photovoltaic junction box includes an isolation paper covering the water-blocking sealant.

[0010] According to the photovoltaic junction box provided by the utility model, the sealing member further includes a sealing adhesive, and the sealing adhesive is arranged on the bottom surface of the photovoltaic junction box body and is located outside the water-blocking sealant.

[0011] According to a photovoltaic junction box provided by the present utility model, the depth of the groove is 0.1 - 1 mm, and / or, the projection of the bus bar connection hole along the depth direction of the groove is located within the through hole.

[0012] The present utility model further provides a photovoltaic module, comprising:

[0013] The photovoltaic junction box according to any one of the above;

[0014] A solar module, comprising a module body and a bus bar leading out from the module body, the module body is connected to the bottom surface of the photovoltaic junction box body through a sealing member, and the water-blocking sealant is used for injection molding in the sealing space surrounded by the bus bar, the module body and the side wall of the groove.

[0015] The photovoltaic junction box and the photovoltaic module provided by the embodiments of the present utility model, by arranging a water-blocking sealant at the groove position of the photovoltaic junction box body, the water-blocking sealant can be injection molded in the sealing space surrounded by the bus bar and the side wall of the groove, so as to improve the sealing and waterproof performance of the connection position between the bus bar and the photovoltaic junction box body, and further seal and waterproof the connection part between the photovoltaic junction box and the solar module, avoiding water vapor from entering the interior of the photovoltaic module and causing corrosion and oxidation of the battery grid lines, thereby improving the service life of the photovoltaic module. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 is one of the structural schematic diagrams of the photovoltaic junction box provided by the present utility model.

[0018] Figure 2 is another structural schematic diagram of the photovoltaic junction box provided by the present utility model.

[0019] Figure 3 is one of the structural schematic diagrams of the photovoltaic module provided by the present utility model.

[0020] Figure 4 is another structural schematic diagram of the photovoltaic module provided by the present utility model.

[0021] Figure 5 is one of the flow schematic diagrams of the photovoltaic module assembly method provided by the present utility model.

[0022] Figure 6 It is the second flow schematic diagram of the photovoltaic module assembly method provided by the present utility model.

[0023] Figure 7 It is the third flow schematic diagram of the photovoltaic module assembly method provided by the present utility model.

[0024] Figure 8 It is the fourth flow schematic diagram of the photovoltaic module assembly method provided by the present utility model.

[0025] Figure 9 It is the fifth flow schematic diagram of the photovoltaic module assembly method provided by the present utility model.

[0026] Figure 10 It is the sixth flow schematic diagram of the photovoltaic module assembly method provided by the present utility model.

[0027] Reference numerals: 100, photovoltaic junction box; 101, photovoltaic junction box body, 102, cable; 103, bus bar connection hole; 104, groove; 105, solder block; 106, diode; 107, first welding copper sheet; 200, solar module; 201, front glass; 202, front encapsulant film; 203, bus bar; 204, back encapsulant film; 205, back glass; 300, water blocking sealant; 400, sealing adhesive. Specific embodiments

[0028] The following further describes in detail the embodiments of the present utility model with reference to the drawings and embodiments. The following embodiments are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0029] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In the description of the embodiments of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected" 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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific situations.

[0031] In the embodiments of the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0032] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0033] An embodiment of the first aspect of the present utility model provides a photovoltaic junction box. The photovoltaic junction box 100 is adapted to a solar module 200, as Figure 1 and Figure 3 shown. The photovoltaic junction box includes a photovoltaic junction box body 101 and a sealing member disposed on the bottom surface of the photovoltaic junction box body 101.

[0034] Among them, a groove 104 is formed on the bottom surface of the photovoltaic junction box body 101. A bus bar connection hole 103 is provided at the bottom of the groove 104. The bus bar 203 of the solar module 200 passes through the bus bar connection hole 103. The sealing member includes a water-blocking sealant 300. The water-blocking sealant 300 at least partially fills the groove 104. The water-blocking sealant 300 has a through hole corresponding to the bus bar connection hole 103. The water-blocking sealant 300 is used for injection molding in the sealing space formed by the bus bar 203 and the side wall of the groove 104.

[0035] It is understandable that in the prior art, a photovoltaic junction box is connected to a solar module to form a photovoltaic module. The bus bar welding area of the photovoltaic junction box has a connection part connected to the solar module. When used in humid areas such as tropical rainforests, the sea surface, and lake surfaces, water vapor will gradually enter the interior of the photovoltaic module through the connection part, causing corrosion and oxidation of the battery grid lines of the photovoltaic module, thereby leading to a decrease in the power of the photovoltaic module and shortening the service life of the photovoltaic module. Therefore, in the embodiment of the present utility model, a water-blocking sealant 300 is provided in the photovoltaic junction box. When the photovoltaic junction box is connected to the solar module 200, the connection part between the junction box and the solar module 200 is sealed and water-blocked by the water-blocking sealant 300, improving the waterproof property of the connection part, thereby preventing water vapor from entering the interior of the photovoltaic module to corrode and oxidize the battery grid lines, and further improving the service life of the photovoltaic module.

[0036] Specifically, the bottom surface of the photovoltaic junction box body 101 is connected to the solar module 200. The bus bar welding area of the photovoltaic junction box body 101 has a bus bar connection hole 103. Then, a groove 104 is opened at the position of the bus bar connection hole 103 on the bottom surface of the photovoltaic junction box body 101. Correspondingly, the bottom of the groove 104 has a bus bar connection hole 103, and the bus bar connection hole 103 is used for the bus bar 203 of the solar module 200 to pass through. The bus bar 203 is introduced into the photovoltaic junction box body 101 for electrical connection within the photovoltaic junction box body 101.

[0037] It is understandable that the groove 104 on the bottom surface of the photovoltaic junction box body 101 is used to set the water-blocking sealant 300. After the water-blocking sealant 300 is melted, it is injection-molded into the sealed space surrounded by the bus bar 203 and the side wall of the groove 104, that is, the water-blocking sealant 300 is provided at the bus bar 203 and the bus bar connection hole 103 of the photovoltaic junction box body 101, thereby improving the sealed waterproof property of the connection position between the bus bar 203 and the photovoltaic junction box body 101, and further realizing the sealed waterproof of the connection part between the photovoltaic junction box and the solar module 200.

[0038] It should be noted that the water-blocking sealant 300 can be only filled in the groove 104 of the photovoltaic junction box body 101 to achieve the sealed waterproof property of the connection position between the bus bar 203 and the photovoltaic junction box body 101. Of course, the water-blocking sealant 300 can also be provided in the groove 104 and the bottom surface of the photovoltaic junction box body 101 around the groove 104. The water-blocking sealant 300 around the groove 104 can realize the sealed waterproof connection between the photovoltaic junction box and the solar module 200, so as to improve the firmness and sealed waterproof property of the connection between the photovoltaic junction box and the solar module 200.

[0039] The photovoltaic junction box provided by the embodiment of the present utility model is provided with a water-blocking sealant 300 at the groove 104 position of the photovoltaic junction box body 101. The water-blocking sealant 300 can be injection-molded in the sealed space surrounded by the bus bar 203 and the side wall of the groove 104, so as to improve the sealing and waterproof performance of the connection position between the bus bar 203 and the photovoltaic junction box body 101, and further seal and waterproof the connection part between the photovoltaic junction box 100 and the solar module 200, avoiding water vapor from entering the photovoltaic module and causing corrosion and oxidation of the battery grid lines, thereby improving the service life of the photovoltaic module.

[0040] In an embodiment of the present utility model, the depth of the groove 104 is 0.1 - 1 mm.

[0041] Specifically, the bottom surface of the photovoltaic junction box body 101 has two bus bar connection holes 103 arranged at intervals, and a groove 104 is provided at the position of the bus bar connection hole 103 on the bottom surface of the photovoltaic junction box body 101. The groove 104 is rectangular. The length of the groove 104 is 20 - 30 mm, and the preferred length is 18 mm; the width of the groove 104 is 10 - 20 mm, and the preferred width is 13 mm; the depth of the groove 104 is 0.1 - 1 mm, and the preferred depth is 0.5 mm.

[0042] It should be noted that a water-blocking sealant 300 is provided at the groove 104, and a hollowed-out part is formed at the position of the water-blocking sealant 300 corresponding to the bus bar connection hole 103 to form a through hole corresponding to the bus bar connection hole 103.

[0043] Furthermore, the edge of the through hole is located outside the edge of the bus bar connection hole 103, so that the projection of the bus bar connection hole 103 along the depth direction of the groove 104 is located within the through hole, and the water-blocking sealant 300 is pre-set around the bus bar connection hole 103 of the photovoltaic junction box body 101. For example, both the through hole and the bus bar connection hole 103 are rectangular, and the distance between the edge of the through hole and the edge of the bus bar connection hole 103 is 0.2 - 1 mm.

[0044] In an embodiment of the present utility model, the height of the water-blocking sealant 300 is higher than the depth of the groove 104, so that the water-blocking sealant 300 has an extending part extending out of the groove 104.

[0045] For example, the width of the groove 104 is the same as the width of the water-blocking sealant 300, and the depth of the groove 104 is half of the height of the water-blocking sealant 300. Optionally, the water-blocking sealant 300 is made of a high water-blocking glue, and the height is 0.2 - 2 mm, preferably 1 mm.

[0046] Further, the photovoltaic junction box 100 includes a release paper (not shown in the figure) covering the water-blocking sealant 300. The release paper is disposed on the side of the water-blocking sealant 300 facing the air. The release paper can be a non-stick paper, which is used to protect and isolate the high water-blocking glue.

[0047] It should be noted that before the photovoltaic junction box 100 is assembled with the solar module 200, a release paper is provided on the water-blocking sealant 300; when the photovoltaic junction box 100 is assembled with the solar module 200, the release paper provided on the water-blocking sealant 300 is removed.

[0048] Further, as Figure 3 shown, the sealing member further includes a sealing adhesive 400. The sealing adhesive 400 is disposed on the bottom surface of the photovoltaic junction box body 101, and the sealing adhesive 400 is located outside the water-blocking sealant 300.

[0049] It can be understood that the water-blocking sealant 300 is disposed in the groove 104 on the bottom surface of the photovoltaic junction box body 101, and the sealing adhesive 400 is disposed around the groove 104 on the bottom surface of the photovoltaic junction box body 101. The sealing connection between the photovoltaic junction box 100 and the solar module 200 is realized through the sealing adhesive 400 to improve the firmness of the connection between the photovoltaic junction box 100 and the solar module 200.

[0050] Optionally, the water-blocking sealant 300 can be one of butyl rubber, chlorobutyl rubber, bromobutyl rubber, epoxy resin glue and polyurethane glue, and preferably butyl rubber.

[0051] An embodiment of the second aspect of the present invention provides a photovoltaic module, as Figure 3 and Figure 4 shown, the photovoltaic module includes a solar module 200 and the photovoltaic junction box 100 provided in any of the above embodiments.

[0052] Specifically, the solar module 200 includes a module body and a bus bar 203 leading out from the module body. The module body is connected to the bottom surface of the photovoltaic junction box body 101 through a sealing member. The water-blocking sealant 300 is used for injection molding in the sealing space surrounded by the bus bar 203, the module body and the side wall of the groove 104 to achieve sealing and waterproofing of the connection part between the photovoltaic junction box 100 and the solar module 200.

[0053] The photovoltaic module provided by the embodiment of the present utility model is provided with a water-blocking sealant 300 at the position of the groove 104 of the photovoltaic junction box body 101. The water-blocking sealant 300 can be injection-molded in the sealed space surrounded by the bus bar 203 and the side wall of the groove 104, so as to improve the sealing and waterproof performance of the connection position between the bus bar 203 and the photovoltaic junction box body 101, and further seal and waterproof the connection part between the photovoltaic junction box 100 and the solar module 200, avoiding water vapor from entering the interior of the photovoltaic module and causing corrosion and oxidation of the battery grid lines, thereby improving the service life of the photovoltaic module.

[0054] In an embodiment of the present utility model, as Figure 3 and Figure 4 shown, one end of the bus bar 203 extending into the junction box body has a bent portion bent toward the bus bar welding area side of the junction box, and the bent portion is welded to the welding area.

[0055] It can be understood that the solar module 200 includes a module main body and a bus bar 203. One end of the bus bar 203 penetrates through the module main body, and the other end of the bus bar 203 extends out of the module main body. The part of the bus bar 203 extending out of the module main body is denoted as the lead wire. When the photovoltaic junction box 100 and the solar module 200 are assembled, the lead wire penetrates through the bus bar connection hole 103 of the photovoltaic junction box body 101 and extends into the junction box body for electrical connection.

[0056] Optionally, the top surface of the photovoltaic junction box body 101 has an opening, and an openable cover is provided at the opening position of the photovoltaic junction box body 101. By opening the cover, the connection of the lead wire in the bus bar welding area of the photovoltaic junction box body 101 can be carried out.

[0057] Specifically, as Figure 2 and Figure 3 shown, a cable 102 penetrates through the photovoltaic junction box body 101. The bus bar welding area in the photovoltaic junction box body 101 has a first welding copper sheet 107 connected to the cable 102. The end of the bus bar 203 extending into the photovoltaic junction box body 101 is bent horizontally toward the side of the first welding copper sheet 107. A tin block 105 is provided on the first welding copper sheet 107 so that the tin block 105 is located between the first welding copper sheet 107 and the end of the bus bar 203. In this way, through the welding of the tin block 105 and the bus bar 203, the electrical connection between the bus bar 203 and the cable is realized.

[0058] It should be noted that the number of the first welding copper sheets 107 in the photovoltaic junction box body 101 is equal to the number of the bus bar connection holes 103 and they correspond one by one.

[0059] Exemplarily, two bus bar connection holes 103 are arranged at intervals along the length direction of the bottom surface of the photovoltaic junction box body 101. Corresponding two first welding copper sheets 107 are arranged inside the photovoltaic junction box body 101, and the first welding copper sheets 107 and the bus bar connection holes 103 can be arranged at intervals along the length direction of the photovoltaic junction box body 101.

[0060] Preferably, a diode is arranged inside the photovoltaic junction box body 101. A second welding copper sheet electrically connected to the cable is arranged at the position between the two bus bar connection holes 103 inside the photovoltaic junction box body 101. The diode is arranged on the second welding copper sheet, so that the diode is arranged at the position between the two bus bar connection holes 103, and the two first welding copper sheets 107 are arranged on the opposite sides of the two bus bar connection holes 103.

[0061] In another embodiment of the present invention, as Figure 3 and Figure 4 shown, the module body includes a back glass 205, a back adhesive film 204, a battery string, a front adhesive film 202 and a front glass 201 which are stacked. The back adhesive film 204 is bonded to the back glass 205, the front adhesive film 202 is bonded to the front glass 201. The battery string includes at least two battery cells, and adjacent two battery cells are electrically connected through welding tapes. Multiple welding tapes are electrically connected through a bus bar 203.

[0062] Specifically, the front glass 201 is used for connecting to the bottom surface of the photovoltaic junction box body 101, and the front adhesive film 202 and the front glass 201 have lead-out holes through which the bus bar 203 passes. Among them, the number of the lead-out holes is equal to the number of the bus bar connection holes 103 on the photovoltaic junction box body 101, and the positions correspond one by one.

[0063] An embodiment of the third aspect of the present invention provides a photovoltaic module assembly method, as Figure 5 shown, this assembly method includes the following steps 510 to step 530.

[0064] Step 510: Fill the groove 104 on the bottom surface of the photovoltaic junction box body 101 with a water-blocking sealant 300. The bottom of the groove 104 has a bus bar connection hole 103, and the water-blocking sealant 300 has a through hole corresponding to the bus bar connection hole 103.

[0065] Step 520: Place the bottom surface of the photovoltaic junction box body 101 on the module body of the solar module 200, and pass the bus bar 203 led out from the module body through the through hole and the bus bar connection hole 103 and extend it into the inside of the photovoltaic junction box body 101.

[0066] Step 530: Melt the water-blocking sealant 300, and the water-blocking sealant 300 is injection-molded in the sealed space surrounded by the bus bar 203, the module body and the side wall of the groove 104.

[0067] It should be noted that the water-blocking sealant 300 is pre-set on the photovoltaic junction box body 101. Only a groove 104 needs to be additionally provided in the structure of the photovoltaic junction box 100, and other structures of the photovoltaic junction box 100 do not need to be changed, which can effectively reduce the investment cost when sealing and waterproofing the connection part between the photovoltaic junction box 100 and the solar module 200.

[0068] The photovoltaic module assembly method provided by the embodiment of the present utility model sets the water-blocking sealant 300 at the position of the groove 104 of the photovoltaic junction box body 101. The water-blocking sealant 300 can be injection-molded in the sealed space surrounded by the bus bar 203, the module main body and the side wall of the groove 104, so as to improve the sealing and waterproof performance of the connection position between the bus bar 203 and the photovoltaic junction box body 101, and further seal and waterproof the connection part between the photovoltaic junction box 100 and the solar module 200, avoiding water vapor from entering the interior of the photovoltaic module and causing corrosion and oxidation of the battery grid lines, thereby improving the service life of the photovoltaic module.

[0069] Optionally, as Figure 6 shown, before step 530, the method further includes the following step 540:

[0070] Step 540: Set a sealing adhesive 400 on the bottom surface of the photovoltaic junction box body 101 and located outside the groove 104.

[0071] It can be understood that the sealing adhesive 400 is applied around the bottom surface of the photovoltaic junction box body 101; and after the photovoltaic junction box body 101 is disposed on the module main body and the bus bar 203 extends into the interior of the photovoltaic junction box body 101, under the action of the sealing adhesive 400, the photovoltaic junction box body 101 is pressed on the module main body, thereby realizing the bonding between the photovoltaic junction box body 101 and the module main body.

[0072] In a specific embodiment of the present utility model, as Figure 7 shown, the assembly method specifically includes the following steps:

[0073] Step 710: Fill the water-blocking sealant 300 into the groove 104 on the bottom surface of the photovoltaic junction box body 101. The bottom of the groove 104 has a bus bar connection hole 103, and the water-blocking sealant 300 has a through hole corresponding to the bus bar connection hole 103.

[0074] Step 720: Set an isolation paper on the side of the water-blocking sealant 300 facing the air.

[0075] It should be noted that steps 710 and 720 are the manufacturing processes of the photovoltaic junction box 100.

[0076] Step 730: Set a sealing adhesive 400 on the bottom surface of the photovoltaic junction box body 101 and around the groove 104.

[0077] It can be understood that the sealing adhesive 400 is applied around the perimeter of the bottom surface of the photovoltaic junction box body 101, and the sealing adhesive 400 uses bonding and sealing silicone.

[0078] Step 740: Remove the release paper.

[0079] It can be understood that the release paper provided on the side of the water-blocking and sealing adhesive 300 facing the air is removed.

[0080] Step 750: Place the bottom surface of the photovoltaic junction box body 101 on the module body of the solar module 200, and pass the bus bar 203 extending from the module body through the through hole and the bus bar connection hole 103 into the interior of the photovoltaic junction box body 101.

[0081] It can be understood that the bus bar connection hole 103 of the photovoltaic junction box 100 is aligned with the bus bar 203 of the solar module 200, and the bus bar 203 is passed through the through hole and the bus bar connection hole 103 into the interior of the photovoltaic junction box body 101, and then the photovoltaic junction box body 101 is pressed on the module body.

[0082] Step 760: Weld one end of the bus bar 203 extending into the junction box body.

[0083] Specifically, the bus bar 203 is welded to the bus bar welding area inside the photovoltaic junction box body 101, and the bus bar 203 has a bent portion bent toward the side of the bus bar welding area.

[0084] It can be understood that the bus bar welding area inside the photovoltaic junction box body 101 has a first welding copper sheet 107 connected to the cable, a tin block 105 is welded on the first welding copper sheet 107, the bent portion of the bus bar 203 is fitted on the upper surface of the tin block 105, and the bent portion of the bus bar 203 is welded to the tin block 105 in the bus bar welding area.

[0085] Step 770: Melt the water-blocking and sealing adhesive 300, and the water-blocking and sealing adhesive 300 is injection-molded into the sealed space surrounded by the bus bar 203, the module body, and the side wall of the groove 104.

[0086] It can be understood that the area of the water-blocking and sealing adhesive 300 of the photovoltaic junction box body 101 is heated, and the heating temperature range is 80 - 160 degrees, and the preferred temperature is 120 degrees, so that the water-blocking and sealing adhesive 300 melts, as Figure 3As shown, the molten water-blocking sealant 300 is evenly filled into the nearby gap, so that the water-blocking sealant 300 is injection-molded in the sealed space surrounded by the bus bar 203, the module body and the side wall of the groove 104, so as to seal and waterproof the connection part between the photovoltaic junction box 100 and the solar module 200.

[0087] Step 780, potting the photovoltaic junction box 100.

[0088] It can be understood that potting silicone is poured into the photovoltaic junction box body 101 to complete the installation process of the photovoltaic junction box 100, and then the assembly process of the solar module 200 and the photovoltaic junction box 100 is completed.

[0089] An embodiment of the fourth aspect of the present invention proposes another photovoltaic module assembly method, as Figure 8 shown, the assembly method includes the following steps 810 to step 820.

[0090] Step 810, place the bottom surface of the photovoltaic junction box body 101 on the module body of the solar module 200, and pass the bus bar 203 extending out of the module body through the bus bar connection hole 103 and extend into the interior of the photovoltaic junction box body 101. The bottom surface of the photovoltaic junction box body 101 is provided with a groove 104, and the bottom of the groove 104 has a bus bar connection hole 103.

[0091] Step 820, inject the molten water-blocking sealant 300 into the sealed space surrounded by the bus bar 203, the module body and the side wall of the groove 104 through the gap between the bus bar 203 and the bus bar connection hole 103, so that the water-blocking sealant 300 is injection-molded in the sealed space.

[0092] It can be understood that the water-blocking sealant 300 can be set by injecting it through the gap between the bus bar 203 and the bus bar connection hole 103. The water-blocking sealant 300 is pre-heated and melted by a junction box bus bar 203 welding machine. After the bottom surface of the photovoltaic junction box body 101 is placed on the module body of the solar module 200, it is then injected from the bus bar connection hole 103, and the groove 104 part at the bottom surface of the photovoltaic junction box body 101 needs to be filled and overflowed; in this way, the molten water-blocking sealant 300 is injected into the sealed space surrounded by the bus bar 203, the module body and the side wall of the groove 104 through the gap between the bus bar 203 and the bus bar connection hole 103, so that the water-blocking sealant 300 is injection-molded in the sealed space surrounded by the bus bar 203, the module body and the side wall of the groove 104.

[0093] It should be noted that when the photovoltaic junction box body 101 and the module body are assembled, the water-blocking sealant 300 is injected by a potting method, which has the characteristics of simple operation and easy implementation.

[0094] Optionally, as Figure 9 shown, after step 820, the method further includes the following step 830:

[0095] Step 830: Weld the bus bar 203 to the bus bar welding area inside the photovoltaic junction box body 101. The bus bar 203 has a bent portion bent toward one side of the bus bar welding area.

[0096] It can be understood that the bus bar welding area in the photovoltaic junction box body 101 has a first welding copper sheet 107 connected to the cable. A solder block 105 is welded on the first welding copper sheet 107. The bent portion of the bus bar 203 is fitted on the upper surface of the solder block 105, and the bent portion of the bus bar 203 is welded to the solder block 105 in the bus bar welding area.

[0097] In a specific embodiment of the present utility model, as Figure 10 shown, the assembly method specifically includes the following steps:

[0098] Step 1001: Set a groove 104 on the bottom surface of the photovoltaic junction box body 101. The bottom of the groove 104 has a bus bar connection hole 103. The water-blocking sealant 300 has a through-hole corresponding to the bus bar connection hole 103.

[0099] It should be noted that step 1001 is the manufacturing process of the photovoltaic junction box 100.

[0100] Step 1002: Set a sealing adhesive 400 on the bottom surface of the photovoltaic junction box body 101 and located outside the groove 104.

[0101] It can be understood that the sealing adhesive 400 is applied around the bottom surface of the photovoltaic junction box body 101. The sealing adhesive 400 uses an adhesive sealing silicone.

[0102] Step 1003: Place the bottom surface of the photovoltaic junction box body 101 on the module body of the solar module 200, and pass the bus bar 203 extending out of the module body through the bus bar connection hole 103 and extend it into the photovoltaic junction box body 101.

[0103] It can be understood that the bus bar connection hole 103 of the photovoltaic junction box 100 is aligned with the bus bar 203 of the solar module 200, and the bus bar 203 is passed through the through-hole and the bus bar connection hole 103 and extended into the photovoltaic junction box body 101, and then the photovoltaic junction box body 101 is pressed on the module body.

[0104] Step 1004: Inject the melted water-blocking sealant 300 into the sealed space formed by the bus bar 203, the module body and the side wall of the groove 104 through the gap between the bus bar 203 and the bus bar connection hole 103, so that the water-blocking sealant 300 is injection-molded in the sealed space.

[0105] It is understandable that, as Figure 4 shown, the water-blocking sealant 300 is preheated and melted by the bus bar welding machine of the junction box, and the melted water-blocking sealant 300 is injected from the bus bar connection hole 103. It is necessary to fill the groove 104 on the bottom surface of the photovoltaic junction box body 101 and there is overflow. In this way, the melted water-blocking sealant 300 is injected into the sealed space surrounded by the bus bar 203, the module body and the side wall of the groove 104 through the gap between the bus bar 203 and the bus bar connection hole 103, so that the water-blocking sealant 300 is injection-molded in the sealed space to achieve sealing and waterproofing of the connection part between the photovoltaic junction box 100 and the solar module 200. Among them, the melting temperature of the water-blocking sealant 300 is 80-160 degrees, and the preferred temperature is 120 degrees.

[0106] Step 1005: Weld the bus bar 203 to the bus bar welding area inside the photovoltaic junction box body 101. The bus bar 203 has a bent part bent toward the bus bar welding area.

[0107] It is understandable that the bus bar welding area in the photovoltaic junction box body 101 has a first welding copper sheet 107 connected to the cable. A tin block 105 is welded on the first welding copper sheet 107. The bent part of the bus bar 203 is fitted on the upper surface of the tin block 105, and the bent part of the bus bar 203 is welded to the tin block 105 in the bus bar welding area.

[0108] Step 1006: Pot the photovoltaic junction box 100.

[0109] It is understandable that potting silicone is poured into the photovoltaic junction box body 101 to complete the installation process of the photovoltaic junction box 100, and then complete the assembly process of the solar module 200 and the photovoltaic junction box 100.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A photovoltaic junction box, characterized in that: The photovoltaic junction box is adapted to a solar module, and the photovoltaic junction box comprises: A photovoltaic junction box body, wherein a groove is provided on the bottom surface of the photovoltaic junction box body, a busbar connection hole is provided at the bottom of the groove, and the busbar of the solar module is passed through the busbar connection hole; The sealing component comprises a water-blocking sealant, wherein the water-blocking sealant at least partially fills the groove, the water-blocking sealant has a via hole corresponding to the busbar connection hole, and the water-blocking sealant is used for injection molding in the sealed space surrounded by the busbar and the side wall of the groove.

2. The photovoltaic junction box according to claim 1, characterized in that: The water blocking sealant has a protruding portion extending out of the groove.

3. The photovoltaic junction box according to claim 2, characterized in that: The photovoltaic junction box comprises a release paper covering the water-blocking sealant.

4. The photovoltaic junction box according to any one of claims 1 to 3, characterized in that: The sealing component also includes a sealing adhesive, which is arranged on the bottom surface of the photovoltaic junction box body and is located at the periphery of the water-blocking sealant.

5. The photovoltaic junction box according to any one of claims 1 to 3, characterized in that: The depth of the groove is 0.1-1 mm, and / or, A projection of the busbar connection hole along a depth direction of the groove is located within the via hole.

6. A photovoltaic module, characterized in that: include: The photovoltaic junction box according to any one of claims 1 to 5; A solar module comprises a module body and a bus bar leading out of the module body, wherein the module body is connected to the bottom surface of a photovoltaic junction box body through a sealing component, and the water-blocking sealant is used for injection molding in a sealed space surrounded by the bus bar, the module body and the side wall of the groove.

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