Photovoltaic module

Abstract

The utility model discloses a photovoltaic assembly. The photovoltaic module comprises a junction box, a cover plate, a front packaging adhesive film, a battery array, a back packaging adhesive film and a back plate, wherein the cover plate, the front packaging adhesive film, the battery array, the back packaging adhesive film and the back plate are arranged in a stacked mode. The battery array comprises a vertically-arranged middle bus bar and battery strings which are arranged on the two sides of the middle bus bar respectively and electrically connected with the middle bus bar. The back plate comprises a first groove-shaped structure corresponding to the middle bus bar and a first connecting line lead-out hole formed in the first groove-shaped structure; the middle bus bar is embedded in the first groove-shaped structure; one end of the middle bus bar extends out of the first groove-shaped structure from the first connecting line lead-out hole and is electrically connected with the junction box. According to the photovoltaic module provided by the scheme, the bus bar can be prevented from generating pressure on the battery pieces, and the hidden crack risk is reduced.

Description

Technical Field

[0001] The utility model relates to a photovoltaic component. Background Art

[0002] As for high-density photovoltaic modules, since they have a smaller module area, they can save the main materials required for the modules (such as frames, covers, films and back panels, etc.) as well as the usage of power station components such as brackets, land and cables. Therefore, high-density photovoltaic modules are becoming more and more popular in the market.

[0003] At present, the density of photovoltaic modules is increased and the size is reduced mainly by reducing the spacing between cells and stacking busbars on cells. On the one hand, the production process of photovoltaic modules with busbars stacked on cells requires major changes to the existing production process of photovoltaic modules, and the operation is relatively cumbersome; on the other hand, stacking busbars on cells will exert additional pressure on the cells, making the photovoltaic modules have a relatively high risk of hidden cracks. Utility Model Content

[0004] In view of this, the utility model provides a photovoltaic module, which can be prepared using the existing production process of photovoltaic modules without changing the existing production process of photovoltaic modules. The operation is relatively simple. In addition, the photovoltaic module provided by the embodiment of the utility model avoids the pressure of the busbar on the battery cell, thereby reducing the risk of hidden cracks in the photovoltaic module.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] The utility model provides a photovoltaic assembly, comprising: a junction box, a stacked cover plate, a front packaging film, a battery array, a back packaging film and a back plate, wherein:

[0007] The battery array includes: a vertically placed middle bus belt and battery strings disposed on both sides of the middle bus belt and electrically connected to the middle bus belt;

[0008] The back plate includes a first groove structure corresponding to the middle busbar and a first connection line lead-out hole arranged on the first groove structure;

[0009] The intermediate busbar is embedded in the first groove structure;

[0010] One end of the middle busbar extends out of the first slot structure from the first connection line lead-out hole and is electrically connected to the junction box.

[0011] The technical solution of the first aspect of the above utility model has the following advantages or beneficial effects:

[0012] In the photovoltaic module provided by the embodiment of the utility model, the battery strings on both sides are connected by a vertically placed middle bus strip, and the first groove structure arranged on the back plate cooperates with the middle bus strip to ensure the sealed package of the photovoltaic module. Compared with the design of laminating the middle bus strip on the edge of the battery cell to reduce the size of the photovoltaic module, the photovoltaic module provided by the embodiment of the utility model can be prepared by the existing production process of photovoltaic modules, without changing the existing production process of photovoltaic modules, and the operation is relatively simple. In addition, the photovoltaic module provided by the embodiment of the utility model avoids the pressure of the bus strip on the battery cell, thereby reducing the risk of hidden cracks in the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of a first cross-sectional structure of a photovoltaic module according to an embodiment of the utility model;

[0014] Figure 2 According to the embodiment of the present utility model, Figure 1 An exploded view of a portion of the photovoltaic module structure is shown;

[0015] Figure 3 is a schematic diagram of a second cross-sectional structure of a photovoltaic module according to an embodiment of the utility model;

[0016] Figure 4 According to the embodiment of the utility model, Figure 3 An exploded view of a portion of the photovoltaic module structure is shown;

[0017] Figure 5 is a schematic diagram of a third cross-sectional structure of a photovoltaic module according to an embodiment of the utility model;

[0018] Figure 6 According to the embodiment of the utility model, Figure 5 An exploded view of a portion of the photovoltaic module structure is shown;

[0019] Figure 7 is a schematic diagram of a fourth cross-sectional structure of a photovoltaic module according to an embodiment of the utility model;

[0020] Figure 8 According to the embodiment of the utility model, Figure 7 An exploded view of a portion of the photovoltaic module structure is shown;

[0021] Fig. 9 is a schematic diagram of a fifth cross-sectional structure of a photovoltaic module according to an embodiment of the utility model;

[0022] Fig.10 According to the embodiment of the utility model, Fig. 9 An exploded view of a portion of the photovoltaic module structure is shown;

[0023] Fig.11is a sixth cross-sectional structural schematic diagram of a photovoltaic module according to an embodiment of the utility model;

[0024] Fig.12 According to the embodiment of the utility model, Figure 8 Schematic diagram of the three-dimensional structure of photovoltaic modules;

[0025] Fig.13 It is a schematic diagram of the three-dimensional structure of a junction box applied to a photovoltaic module according to an embodiment of the utility model;

[0026] Fig.14 This is a schematic structural diagram of the contact surface between the junction box and the photovoltaic module according to an embodiment of the utility model;

[0027] Fig.15 This is a side view of the relative relationship between the junction box and the busbar according to an embodiment of the utility model;

[0028] Fig.16 is a side view of a junction box according to an embodiment of the utility model;

[0029] Fig.17 is a schematic diagram of a side cross-sectional structure of a junction box according to an embodiment of the utility model;

[0030] Fig.18 It is a schematic diagram of the direction of the lead-out portion of the busbar connected to the same junction box according to an embodiment of the utility model;

[0031] Fig.19 It is a schematic diagram of the main process of the method for preparing a photovoltaic module according to an embodiment of the utility model;

[0032] Fig. 20 It is a schematic diagram of structural changes corresponding to step S1902 in the method for preparing a photovoltaic module according to an embodiment of the utility model;

[0033] Fig.21 It is a schematic diagram of the structure of the laminating tooling part according to an embodiment of the utility model.

[0034] The reference numerals are as follows:

[0035] 10-cover plate; 20-front packaging film; 30-battery array; 31-middle bus belt; 32-battery string; 33-edge bus belt; 40-back packaging film; 41-second groove-type structure; 42-fourth groove-type structure; 44-second transparent conductive film layer; 50-back plate; 51-first groove-type structure; 52-first connecting wire lead-out hole; 53-third groove-type structure; 60-junction box; 61-installation groove; 62-electrical connection part; 63-bus belt connection groove; 64-split part; 65-through hole; 66-housing; 100-lamination tooling. DETAILED DESCRIPTION

[0036] The stacking arrangement involved in the embodiments of the present invention generally refers to a structure stacked on top of or below another structure, and the structure may be in direct or indirect contact with the main surface of the other structure. Direct contact generally refers to the one structure being directly formed, grown, or deposited on the upper or lower surface of the other structure; indirect contact generally refers to the other functional layers being formed between the one structure and the other structure.

[0037] The upper surface or front surface of a structure involved in the embodiments of the utility model generally refers to a surface of the structure facing the sunlight or facing upwards during the use of the solar cell, or a partial area including the surface facing the sunlight or the surface facing upwards; the lower surface or back surface of a structure generally refers to a surface of the structure facing away from the sunlight or facing downwards during the use of the solar cell, or a partial area including the surface facing away from the sunlight or the surface facing downwards. Among them, the upper surface and the lower surface or the front surface and the back surface of a structure are opposite to each other.

[0038] The "first", "second", "third" and "fourth" involved in the embodiments of the present invention are to distinguish different structures or components or different positions of the same structure, and are not intended to limit the number, order, etc. of structures or components. For example, the first slot-shaped structure and the second slot-shaped structure involved in the embodiments of the present invention are generally used to distinguish slot-shaped structures that are in different positions and / or have certain differences in structure. For another example, the first connecting wire lead-out hole and the second connecting wire lead-out hole are used to distinguish connecting wire lead-out holes that are in different positions.

[0039] In order to solve the limitation of busbars in existing photovoltaic modules on improving the density of photovoltaic modules and reducing the size of the modules, the embodiments of the utility model provide a photovoltaic module with a new structure, a junction box applied to the photovoltaic module, and a method for preparing the photovoltaic module.

[0040] in, Figures 1 to 7 as well as Figures 9 to 11 A schematic cross-sectional structure diagram showing a partial structure of a photovoltaic module provided by an embodiment of the utility model; Figure 8 and Fig.12 A schematic diagram showing the three-dimensional structure of a photovoltaic module provided by an embodiment of the utility model is shown; Figures 13 to 17 A partial structural schematic diagram of a junction box provided by an embodiment of the utility model is shown; Fig.18 A schematic structural diagram showing the relative relationship between the lead-out ends of two sections of busbars connected to the same junction box provided by an embodiment of the utility model is shown.

[0041] like Figures 1 to 12 As shown, the embodiment of the utility model provides a photovoltaic module. The photovoltaic module may include:

[0042] The junction box 60, and the cover plate 10, the front packaging film 20, the battery array 30, the back packaging film 40 and the back plate 50 are stacked, wherein:

[0043] The battery array 30 includes: a vertically placed middle busbar 31 and battery strings 32 disposed on both sides of the middle busbar 31 and electrically connected to the middle busbar 31;

[0044] The back plate 50 includes a first groove structure 51 corresponding to the middle busbar 31 and a first connection line lead-out hole 52 disposed on the first groove structure 51;

[0045] The middle busbar 31 is embedded in the first groove structure 51;

[0046] One end of the middle busbar 31 extends out of the first slot structure 51 from the first connection line lead-out hole 52 and is electrically connected to the junction box 60 .

[0047] Among them, the middle busbar 31 is generally a rectangular parallelepiped or a structure similar to a rectangular parallelepiped. The middle busbar 31 placed vertically generally refers to the two opposite first surfaces of the middle busbar 31 (the first surface contains a long side and has a smaller area) respectively opposite to the cover plate 10 and the back plate 50, and the two opposite second surfaces of the middle busbar 31 (the second surface contains a long side and has the largest area, that is, the two main surfaces with the largest area) respectively correspond to the battery strings 32 arranged on both sides of the middle busbar 31. Among them, the middle busbar 31 can directly select the middle busbar 31 used in the prior art (in the prior art, the two main surfaces of the middle busbar 31 with the largest area (that is, the second surface) respectively correspond to the cover plate 10 and the back plate 50, and the two opposite first surfaces respectively correspond to the battery strings 32 arranged on both sides of the middle busbar 31). However, when the embodiment of the utility model directly adopts the middle bus strip used in the prior art, compared with the prior art, the two main surface positions with the largest area of ​​the vertically placed middle bus strip 31 in the embodiment of the utility model are rotated by 90 degrees or 270 degrees.

[0048] Due to the use of the vertically placed middle busbar 31, the area of ​​the front packaging film 20 occupied by the middle busbar 31 is greatly reduced, so that the spacing between the battery strings 32 arranged on both sides of the middle busbar 31 can be reduced, reducing the area of ​​the photovoltaic module and increasing the density of the photovoltaic module.

[0049] In addition, by selecting a busbar of existing size as the intermediate busbar 31, the ability of the intermediate busbar 31 to collect current is ensured while ensuring that the manufacturing process does not require major changes, making the manufacturing process universal and not increasing the cost of the photovoltaic module.

[0050] In addition, the photovoltaic module provided in the embodiment of the utility model is a new type of structure. Compared with the design of laminating the intermediate busbar 31 on the edge of the battery cell to reduce the size of the photovoltaic module, the photovoltaic module provided in the embodiment of the utility model can be prepared using the existing production process of photovoltaic modules without changing the existing production process of photovoltaic modules. The operation is relatively simple, and the photovoltaic module provided in the embodiment of the utility model avoids the busbar from exerting pressure on the battery cell, thereby reducing the risk of hidden cracks in the photovoltaic module.

[0051] Among them, for the above-mentioned intermediate bus band 31, in the thickness direction of the photovoltaic module, the thickness of the intermediate bus band 31 is greater than the thickness of the battery string 32; the width of the intermediate bus band 31 in the extension direction of the battery string 32 is less than or equal to the thickness of the battery cell in the battery string 32, so as to reduce the spacing between the battery strings 32 arranged on both sides of the intermediate bus band 31; that is, in the photovoltaic module provided by the embodiment of the utility model, the battery strings 32 on both sides are connected by the vertically placed intermediate bus band 31, and the width of the intermediate bus band 31 in the extension direction of the battery string 32 is less than or equal to the thickness of the battery cell in the battery string 32, the intermediate bus band 31 is embedded in the first groove structure 51 of the back plate 50, so as to reduce the spacing between the battery strings 32 arranged on both sides of the intermediate bus band 31, so as to reduce the area of ​​the photovoltaic module. In addition, by designing that the thickness of the intermediate bus band 31 in the thickness direction of the photovoltaic module is greater than the thickness of the battery string 32, the ability of the intermediate bus band 31 to collect current can be guaranteed.

[0052] Among them, the edge battery cells close to the middle busbar 31 in the battery string 32 are welded and connected to the side surface of the middle busbar 31 corresponding to the edge battery cells through the interconnection belt. In other words, the edge battery cells close to the middle busbar 31 are electrically connected to the second surface of the middle busbar 31 through the interconnection belt, ensuring that the interconnection belt and the middle busbar 31 can be fully in contact. In addition, this structure can clamp the middle busbar 31 through the battery strings 32 arranged on both sides of the middle busbar 31, ensuring that the middle busbar 31 placed vertically is stable.

[0053] In order to cooperate with the vertically placed middle busbar 31, the embodiment of the utility model provides a plurality of structures of back packaging films 40 and a plurality of structures of back panels 50, wherein the plurality of structures of back packaging films 40 and the plurality of structures of back panels 50 cooperate with the vertically placed middle busbar 31 to obtain a plurality of structures of photovoltaic modules, wherein: Figures 1 to 12 Only a partial structure of the photovoltaic assembly is given as an example. It is worth noting that any other photovoltaic assembly provided by the embodiment of the utility model and Figures 1 to 12 The photovoltaic modules obtained by deforming the photovoltaic module structure shown are also within the protection scope of the present application.

[0054] The difference between the various structures of the backplane 50 is mainly that the relative relationship between the first groove structure and the main surface of the backplane 50 is different. Specifically, the embodiment of the utility model provides two backplane 50 structures that match the vertically placed middle busbar 31.

[0055] Among them, Figures 1 to 4 , Fig. 9 and Fig.10 As shown, the first backplane 50 structure includes a first groove structure 51 which is confined within the backplane 50. The first backplane 50 structure can be obtained by directly grooving an existing backplane. The side of the first backplane 50 structure away from the battery array 30 is a planar structure. Based on this, the thickness of the first backplane 50 structure provided in the embodiment of the utility model is generally 5 to 9 mm. For example, the thickness of the first backplane 50 structure may be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, etc. In addition, in order to ensure the waterproofness of the first backplane 50 structure, the thickness of the first groove structure 51 away from the middle busbar 31 is generally not less than 0.5 mm.

[0056] Among them, Figures 5 to 8 , Fig.11 and Fig.12 As shown, the first groove structure 51 included in the second back sheet 50 structure is a convex structure on the main surface of one side relative to the thickness direction of the back sheet 50. The opening of the convex structure is located on the other side in the thickness direction of the back sheet 50. Wherein, when the back sheet 50 is applied to a photovoltaic module, the side with the convex structure in the thickness direction of the back sheet 50 is the outer side of the back sheet 50. For the second back sheet 50 structure, except for the area where the first groove structure 51 is located, the thickness of other areas of the back sheet 50 can be a normal thickness.

[0057] The outer side of a structure generally refers to a side of the structure away from the battery array 30 in the thickness direction of the photovoltaic module.

[0058] Furthermore, regardless of whether it is the first groove structure 51 of the first back plate 50 structure or the first groove structure 51 of the second back plate 50 structure, both ends of the first groove structure 51 can be open or closed, and the user can choose according to needs. In addition, the slot size (slot width, slot length, slot height) of the first groove structure 51 can be controlled according to needs.

[0059] Furthermore, the back packaging film 40 may also have two structures that match the vertically placed middle busbar 31. Figure 2 and Figure 6 As shown, the first back packaging film 40 structure can be a planar back packaging film 40 disposed on both sides of the vertically placed middle busbar 31. Figure 4 and Figure 8As shown, the second back packaging film 40 structure can be a second groove structure 41 disposed in the middle area of ​​the back packaging film 40, wherein the second groove structure 41 is a convex structure relative to the outer side of the back packaging film 40. The second groove structure 41 is used to accommodate a part of the middle busbar 31.

[0060] The two back plate 50 structures matched with the vertically placed middle bus strip 31 and the two back packaging film 40 structures matched with the vertically placed middle bus strip 31 can be combined arbitrarily.

[0061] Specifically, the first combination structure of the back plate 50 and the back packaging film 40 is as follows: Figure 1 and Figure 2 As shown. The first combination structure is a combination of the above-mentioned first backplane 50 structure and the above-mentioned first back packaging film 40 structure. For the first combination structure, the intermediate bus band 31 is directly embedded in the first groove structure 51 of the backplane 50. During the lamination process, the back packaging film 40 disposed on both sides of the intermediate bus band 31 can be cast to the gap between the side of the intermediate bus band 31 and the side of the first groove structure 51, so as to achieve the purpose of sealing the battery string 32 in the battery array. In addition, by casting the back packaging film 40 to the gap between the side of the intermediate bus band 31 and the side of the first groove structure 51, the intermediate bus band 31 can be further stabilized, ensuring that the relative position of the battery string 32 and the intermediate bus band 31 is relatively stable, thereby ensuring that the battery string 32 and the intermediate bus band 31 form a stable electrical connection.

[0062] Specifically, the second combination structure of the back plate 50 and the back packaging film 40 is as follows: Figure 3 and Figure 4 As shown. The second combination structure is a combination of the first backplane 50 structure and the second back packaging film 40 structure. For the second combination structure, the middle bus band 31 is embedded in the second groove structure 41 of the second back packaging film 40 structure, and then the middle bus band 31 and the protruding part of the second groove structure 41 are embedded in the first groove structure 51 of the backplane 50. During the lamination process, the second groove structure 41 part will isolate the first groove structure 51 and the middle bus band 31, so as to avoid damage to the middle bus band 31 during the lamination process and better seal the battery array 30.

[0063] Specifically, the third combination structure of the back plate 50 and the back packaging film 40 is as follows: Figure 5 and Figure 6As shown. The third combination structure is a combination of the second backplane 50 structure and the first back packaging film 40 structure. For the second backplane 50 structure: the first groove structure 51 is a convex structure relative to the outer side of the backplane 50; accordingly, the first connection line lead-out hole 52 is arranged on both sides of the convex structure. For the third combination structure, during the lamination process, the back packaging film 40 arranged on both sides of the middle busbar 31 is cast between the side of the first groove structure 51 and the side of the middle busbar 31 to achieve the purpose of sealing the battery string 32.

[0064] Specifically, the fourth combination structure of the back plate 50 and the back packaging film 40 is as follows: Figure 7 and Figure 8 As shown. The fourth combination structure is a combination of the second back plate 50 structure and the second back packaging film 40 structure. For the second back plate 50 structure: the first groove structure 51 is a protruding structure relative to the outer side of the back plate 50; the first connection line lead-out holes 52 are arranged on both sides of the protruding structure. Figure 7 and Figure 8 As shown, the second back packaging film 40 structure includes a second groove structure 41 corresponding to the middle bus strip 31 and a second connection line lead-out hole (not shown in the figure) arranged on the second groove structure 41 and corresponding to the first connection line lead-out hole 52. For the fourth combination structure, the back packaging film 40 enters between the first groove structure 51 and the middle bus strip 31 to better seal the battery array 30.

[0065] In the above four combination structures, the portion of the back packaging film 40 corresponding to the middle busbar 31 is embedded in the first groove structure 51; the difference is that in the second and fourth combination structures, the second groove structure 41 included in the back packaging film 40 is completely filled between the first groove structure 51 and the middle busbar 31 to achieve the purpose of sealing the battery array. In the first and third combination structures, the back packaging film 40 only partially fills the gap between the side of the first groove structure 51 and the side of the middle busbar 31, and cooperates with the middle busbar 31 to achieve the purpose of sealing the battery string 32.

[0066] It can be understood that for the first and third combination structures, the width of the first groove structure 51 is substantially consistent with the thickness of the middle busbar 31; the depth of the first groove structure 51 is substantially consistent with the value obtained by subtracting the thickness of the battery cell and the thickness of the back packaging film 40 from the width of the middle busbar 31. For the second and fourth combination structures, the width and depth of the first groove structure 51 need to be able to accommodate the middle busbar 31 and the second groove structure 41. The specific size of the first groove structure 51 can be adjusted according to the designed size of the second groove structure 41 and the size of the middle busbar 31.

[0067] That is to say, in the above second and fourth combination structures, if Figure 3 , Figure 4 , Figure 7 and Figure 8 As shown, the back packaging film 40 includes a second groove structure 41 corresponding to the intermediate bus band 31 and a second connection line lead-out hole (not shown in the figure) arranged on the second groove structure 41 and corresponding to the first connection line lead-out hole 52; the second groove structure 41 is embedded in the first groove structure 51; the intermediate bus band 31 is embedded in the second groove structure 41; one end of the intermediate bus band 31 extends from the second connection line lead-out hole and the first connection line lead-out hole 52 to the first groove structure 51.

[0068] Furthermore, in the structure of the photovoltaic module provided by the embodiment of the utility model, the battery array 30 further includes: a vertically placed edge busbar 33 connected in series with the battery string 32; Figures 9 to 11 As shown, the back plate 50 also includes a third groove structure 53 corresponding to the edge busbar 33, wherein the edge busbar 33 is embedded in the third groove structure 53. That is, compared with the edge busbar of the existing photovoltaic module, the edge busbar 33 in the photovoltaic module provided by the embodiment of the utility model can also be placed vertically.

[0069] On the basis of the vertically placed edge busbar 33, as Figures 9 to 11 As shown, in the thickness direction of the photovoltaic module, the thickness of the edge bus band 33 is greater than the thickness of the battery string 32; the width of the edge bus band 33 in the extension direction of the battery string 32 is less than or equal to the thickness of the battery cell in the battery string 32; the edge bus band 33 is embedded in the third groove structure 53. The thickness of the edge bus band 33 is greater than the thickness of the battery string 32 (that is, the thickness of the battery cell in the battery string 32) to better seal the photovoltaic module. In the subsequent use of the photovoltaic module, it can better prevent rainwater from entering the photovoltaic module from the side of the photovoltaic module. Even if the amount of the packaging film on the edge of the photovoltaic module is relatively small or aging occurs, the design of the edge bus band 33 can also better prevent water vapor erosion.

[0070] The vertically placed edge busbar 33 can be obtained by rotating the edge busbar placement direction used in the prior art by 90 degrees or 270 degrees. The size of the edge busbar 33 in the thickness direction of the photovoltaic module and the size of the battery string 32 in the extension direction can also be redesigned.

[0071] It can be understood that for the structure in which the battery array 30 includes the vertically placed edge busbars 33 and the back plate 50 includes the third groove structure 53, the third groove structure 53 corresponding to the edge busbars 33 included in the back plate 50 can be applied to the four combined structures formed by the back plate and the back packaging film involved in the above embodiment to form a photovoltaic module with a new structure. Fig. 9 and Fig.10 The third groove structure 53 corresponding to the edge busbar 33 is only exemplarily shown to be applied to the above Figure 1 and Figure 2 After the first combination structure is shown, a photovoltaic module with a new structure is formed; Fig.11 The third groove structure 53 is exemplarily shown to be applied to the above Figure 5 and Figure 6 After the third combination structure is shown, a photovoltaic module with a new structure is formed. Based on this, those skilled in the art can know how to apply the third groove structure 53 to the second combination structure and the fourth combination structure, which will not be described in detail here.

[0072] Furthermore, in order to better meet the requirements of the third groove structure 53 of the edge busbar 33 structure, the back encapsulation film 40 and the back sheet 50 structure, and facilitate the control of the photovoltaic module assembly, lamination and other process steps, as shown in FIG. Figures 9 to 11 As shown, the back encapsulation film 40 includes a fourth groove structure 42 corresponding to the edge busbar 33; the fourth groove structure 42 is embedded in the third groove structure 53; the edge busbar 33 is embedded in the fourth groove structure 42. Through the design of the fourth groove structure 42, it cooperates with the edge busbar 33. On the one hand, the fourth groove structure 42 can stabilize the edge busbar 33, and on the other hand, the fourth groove structure 42 can cooperate with the edge busbar 33 to better encapsulate the edge of the photovoltaic module and prevent water vapor from invading from the edge of the photovoltaic module.

[0073] It is worth noting that the shapes of the inner bottom surfaces of the first groove structure 51 , the second groove structure 41 , the third groove structure 53 and the fourth groove structure 42 (ie the side facing the busbar) match the shape of the backlight surface of the busbar.

[0074] Among them, for the photovoltaic module including the first backplane 50 structure, the junction box 60 can directly select the existing junction box.

[0075] Further, in order to meet the requirements of the second back sheet 50 structure (i.e., the back sheet 50 structure having a convex structure relative to the outer side), so that the junction box can better fit the back sheet 50, in the photovoltaic module provided by the embodiment of the utility model, Figures 12 to 17As shown, the junction box 60 included in the photovoltaic assembly may include: a mounting groove 61 matched with the protruding structure, an electrical connection portion 62 disposed on both sides of the mounting groove 61, and a diode module (not shown in the figure) electrically connected to the electrical connection portion 62;

[0076] The mounting groove 61 is embedded in the protruding structure;

[0077] For two adjacent intermediate bus bars 31 connected to the same junction box 60,

[0078] One end of a middle busbar 31 is electrically connected to an electrical connection portion 62 on one side of the mounting groove;

[0079] One end of another middle busbar 31 is electrically connected to the electrical connection portion 62 on the other side of the mounting groove.

[0080] In addition to the two electrical connection parts 62, the junction box 60 also includes a diode module, and the two electrical connection parts 62 are electrically connected to the positive electrode and the negative electrode of the diode module respectively. The two electrical connection parts 62 can be electrode connection pieces provided on the junction box 60, wherein the electrode connection piece can be connected to one end of the busbar 31 by soldering. In addition, the two electrical connection parts 62 are two electrode connection pieces, and the two electrode connection pieces are located on both sides of the protruding structure and are parallel to each other.

[0081] The mounting groove 61 is engaged with the protruding structure so that Fig.14 One main surface of the junction box 60 is attached to the backlight surface of the back plate, which ensures that the junction box 60 is stable and can achieve the purpose of sealing the junction box 60.

[0082] For two adjacent middle bus bars 31 connected to the same junction box 60 , the two ends extending out of the first groove structure 51 have the same orientation and are consistent with the extending direction of the first groove structure 51 of the protruding structure.

[0083] like Fig.18 As shown, for two adjacent intermediate busbars 31 connected to the same junction box 60, one end of the first intermediate busbar 31 extending out of the first groove structure 51 is bent toward the other end (i.e., one end of the first intermediate busbar 31 extending out of the first groove structure 51 is folded back); one end of the second intermediate busbar 31 extending out of the first groove structure 51 is extended toward the direction of the first intermediate busbar 31. When the portions of the two adjacent intermediate busbars 31 connected to the same junction box 60 extending out of the photovoltaic module are both facing the same side, the subsequent installation of the junction box 60 can firstly engage the junction box 60 on the protruding structure, and then slide the junction box 60 in one direction, so that the intermediate busbar 31 can be brought into contact with the electrical connection portion 62 of the junction box 60, which facilitates the installation of the intermediate busbar 31 to the junction box 60.

[0084] Among them, for the situation where the parts of the two adjacent intermediate bus strips 31 connected to the same junction box 60 extending out of the photovoltaic components are facing the same side, after the junction box 60 is installed on the raised structure, the parts of the two adjacent intermediate bus strips 31 extending out of the photovoltaic components can be located inside the shell of the junction box 60.

[0085] For example, for Fig.18 In the structure of two adjacent middle busbars 31 shown in FIG. 1 , the junction box 60 can be first installed on the raised structure, wherein the two electrical connection parts of the junction box 60 are located at Fig.18 The right side of the two adjacent intermediate bus strips 31 shown can subsequently slide on the raised structure along direction D so that the intermediate bus strip 31 can be installed on the junction box 60, the intermediate bus strip 31 contacts the electrical connection part 61, and then the intermediate bus strip 31 and the electrical connection part 61 are directly soldered to form a stable electrical connection.

[0086] In addition, the junction box 60 also includes: two busbar inlets 64 (not shown in the figure) arranged at one end of the shell, wherein one busbar inlet 64 corresponds to one electrical connection portion 61, and the other busbar inlet 64 corresponds to another electrical connection portion. One end of the intermediate busbar 32 extending from the first groove structure 51 is brought into contact with the corresponding electrical connection portion 61 through the busbar inlet 64. With respect to this structure, the junction box 60 can be directly installed on the portion of the protruding structure not occupied by the busbar, and then the intermediate busbar 32 is brought into contact with the electrical connection portion 61 through the busbar inlet 64 by sliding the junction box 60 on the protruding structure.

[0087] Furthermore, if Figures 15 to 17 As shown, the junction box 60 further includes: busbar connection slots 63 disposed on both sides of the mounting slot 61, wherein:

[0088] The electrical connection portion 62 is disposed in the busbar connection groove 63;

[0089] One end of the middle busbar 31 extending from the first groove structure 51 is embedded in the busbar connecting groove 63 .

[0090] By setting the busbar connecting groove 63, during the movement of the junction box 60, it is convenient to guide the intermediate busbar 31 to shift relative to the junction box along the busbar connecting groove 63, thereby ensuring the accurate installation of the intermediate busbar 31 and facilitating the subsequent stabilization of the position of the intermediate busbar 31 in the busbar connecting groove 63, thereby avoiding displacement after the intermediate busbar 31 forms a stable electrical connection with the junction box 60.

[0091] Furthermore, if Figures 13 to 17As shown, the junction box 60 further includes: two split parts 64, wherein the diode module included in the junction box 60 is arranged in one split part 64, and the diode module is electrically connected to the two electrical connection parts 62; the two split parts 64 are detachably connected and surround the installation groove 61; the two electrical connection parts 62 are arranged in the two split parts 64. The design of the two split parts 64 facilitates the installation of the junction box 60. In addition, after a problem occurs in the diode module, it can be replaced directly by replacing a new split part 64, which facilitates the subsequent maintenance of the junction box 60.

[0092] The detachable connection of the two split parts 64 means that the two split parts 64 can be connected by means of an opening and disassembly method such as threaded screws, expansion screws, etc.

[0093] Furthermore, if Fig.14 As shown, the junction box 60 further includes: two through holes 65 disposed at both ends of the junction box 60 housing, wherein the two through holes 65 correspond to the mounting slot 61, and the connecting line of the two through holes 65 is consistent with the extending direction of the mounting slot 61. The provision of the through holes 65 enables the junction box 60 housing to be well engaged with the protruding structure, so as to better stabilize the junction box 60.

[0094] Furthermore, if Fig.14 As shown, the junction box 60 may further include: a housing 66 disposed around the two split parts 64, wherein the housing 66 is used to contain sealant to better stabilize the junction box 60 and better seal the junction box 60.

[0095] Furthermore, the above-mentioned junction box further includes: a sealing cover (not shown in the figure), wherein the sealing cover is covered on the housing 66 to seal the two split parts 64 in the space enclosed by the housing 66 and the sealing cover 67 to further seal the junction box 60 .

[0096] The photovoltaic module provided by the embodiment of the utility model has a more stable connection between the interconnection belt and the middle bus belt, and a more stable connection between the junction box and the middle bus belt, so that the photovoltaic module has higher photoelectric conversion efficiency and better reliability.

[0097] In addition, the various components of the photovoltaic module provided by the embodiment of the utility model remain consistent, and the welding point between the interconnection ribbon and the middle bus ribbon is located on the side, making the appearance of the photovoltaic module more beautiful.

[0098] Furthermore, the present invention provides a method for preparing the photovoltaic module, such as Fig.19 As shown, the preparation method may include the following steps:

[0099] Step S1901: sequentially laying the cover plate 10, the front packaging film 20, the arranged battery strings 32, the vertically placed middle busbars 31 and the edge busbars 33;

[0100] In this step, the cover plate 10 is first laid, the front packaging film 20 is laid on the cover plate 10, and the arranged battery strings 32, the vertically placed middle bus strips 31 and the edge bus strips 33 are laid on the front packaging film 20. The laying order of the battery string 32, the vertically placed middle bus strips 31 and the edge bus strips 33 may be to lay the battery string 32 first, and then lay the middle bus strips 31 and the edge bus strips 33 according to the position of the battery string 32.

[0101] Step S1902: establishing electrical connection between the middle busbar 31 and the edge busbar 33 and the battery string 32;

[0102] The interconnecting bands of the edge cells corresponding to the laying position of the middle busbar 31 in the cell string are in a bent state; accordingly, this step may include: welding the bent interconnecting bands of the edge cells to the side surfaces of the middle busbar 31 .

[0103] Specifically, Fig. 20 As shown, the battery string 32 is first laid on the front packaging film 20, and then the interconnection ribbon corresponding to the middle bus ribbon 31 in the battery string 32 is bent to form a bent state. Then the middle bus ribbon 31 is vertically placed between the bent interconnection ribbons, and finally the bent interconnection ribbon is welded to the side surface corresponding to the interconnection ribbon in the middle bus ribbon 31. The side surface area is relatively large, so that the interconnection ribbon and the middle bus ribbon 31 form a stable electrical connection.

[0104] In addition, for the structure in which the edge bus strip 33 is placed vertically, the edge interconnection strip is also bent, and then the edge bus strip 33 is placed vertically, and finally the interconnection strip is welded to the side of the vertically placed edge bus strip 33 corresponding to the interconnection strip to ensure that the interconnection strip and the edge bus strip 33 form a stable electrical connection.

[0105] Step S1903: sequentially stacking and covering the back packaging film 40 and the back plate 50 on the battery string 32, wherein the middle bus strip 31 is embedded in the first groove structure 51 included in the back plate 50, and one end of the middle bus strip 31 extends out of the first groove structure 51 from the first connection line lead-out hole 52 included in the back plate 50, to form a stacked component;

[0106] For the back packaging film 40 Figure 2 and Figure 6 In the structure shown, the middle bus strip 31 can be directly led out from the first connection line lead-out hole 52 , or the bus strip lead-out wire can be electrically connected to the middle bus strip 31 through the first connection line lead-out hole 52 .

[0107] In the case where the back packaging film 40 includes a second groove structure 41, a second connecting wire lead-out hole corresponding to the first connecting wire lead-out hole 52 is provided on the second groove structure 41, and the intermediate bus band 31 is subsequently led out from the first connecting wire lead-out hole 52 and the second connecting wire lead-out hole, or the lead-out wires of the intermediate bus band 31 are electrically connected to the intermediate bus band 31 through the first connecting wire lead-out hole 52 and the second connecting wire lead-out hole.

[0108] Step S1904: laminating the stacked parts.

[0109] against Figures 1 to 4 , Fig. 9 and Fig.10 For the structure shown in the figure, the laminating tooling used in this step can directly use the existing laminating tooling. Figures 5 to 8 and Fig.11 The structure shown in the figure, the laminating tooling used in this step is as follows Fig. 20 The lamination tool 100 shown in FIG. The lamination tool 100 includes a groove matching the protrusion structure so as not to damage the photovoltaic module during the lamination process.

[0110] It can be seen from the above steps that compared with the existing photovoltaic module preparation method, the photovoltaic module preparation method of the embodiment of the utility model has relatively few changes, and the photovoltaic module preparation provided by the embodiment of the utility model can be achieved by simply adjusting the existing photovoltaic module preparation process, so that the photovoltaic module provided by the embodiment of the utility model can be prepared on the basis of the existing process, avoiding various tedious operations, making the preparation cost controllable, and suitable for large-scale promotion.

[0111] In addition, compared with the existing photovoltaic module preparation method, the improved parts of the embodiment of the utility model are relatively simple, easy to implement, convenient for mass production, and conducive to the marketization of photovoltaic modules.

[0112] Furthermore, the first groove structure 51 is a protruding structure relative to the outer side of the back plate 50; the above-mentioned preparation method also includes: assembling the installation groove 61 included in the junction box 60 on the protruding structure, and sliding the junction box 60 in one direction so that the electrical connection part 62 of the junction box 60 contacts the end of the corresponding intermediate bus strip 31 extending out of the first groove structure 51, and welds them.

[0113] Furthermore, the present invention also provides a method as follows: Figures 12 to 17The junction box shown. The junction box can be used in combination with the photovoltaic assembly provided in the above embodiment, that is, the junction box is a part of the above photovoltaic assembly. In addition, the junction box can also be used as an independent structure, sold or purchased separately, to be applied to the above photovoltaic assembly or other equipment or other components. The structure of the junction box has been described in detail in the above embodiment and will not be repeated here. The introduction provided in the above steps is only used to help understand the method, structure and core idea of ​​the utility model. For ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A photovoltaic module, characterized in that: include: A junction box (60), a cover plate (10), a front packaging film (20), a battery array (30), a back packaging film (40) and a back plate (50) are stacked, wherein: The battery array (30) comprises: a vertically placed middle busbar (31) and battery strings (32) arranged on both sides of the middle busbar (31) and electrically connected to the middle busbar (31); The back plate (50) comprises a first groove structure (51) corresponding to the middle busbar (31) and a first connection line lead-out hole (52) arranged on the first groove structure (51); The intermediate busbar (31) is embedded in the first groove structure (51); One end of the intermediate busbar (31) extends out of the first slot-shaped structure (51) from the first connection line lead-out hole (52) and is electrically connected to the junction box (60).

2. The photovoltaic module according to claim 1, characterized in that: The back packaging adhesive film (40) comprises a second groove structure (41) corresponding to the middle busbar (31) and a second connection line lead-out hole (52) arranged on the second groove structure (41); The second groove-shaped structure (41) is embedded in the first groove-shaped structure (51); The intermediate busbar (31) is embedded in the second groove structure (41); One end of the intermediate busbar (31) extends out of the first slot-shaped structure (51) from the second connection line lead-out hole and the first connection line lead-out hole (52).

3. The photovoltaic module according to claim 1 or 2, characterized in that: The first groove-shaped structure (51) is a convex structure relative to the outer side of the back plate (50); The first connection line lead-out holes (52) are arranged on both sides of the protruding structure.

4. The photovoltaic module according to claim 3, characterized in that: The junction box (60) comprises: a mounting groove (61) matched with the protruding structure, electrical connection parts (62) arranged on both sides of the mounting groove (61), and a diode module electrically connected to the electrical connection parts (62); The mounting groove (61) is embedded in the protruding structure; For two adjacent intermediate bus bars (31) connected to the same junction box (60), One end of one of the middle bus bars (31) is electrically connected to the electrical connection portion (62) on one side of the mounting groove; One end of another of the middle bus bars (31) is electrically connected to the electrical connection portion (62) on the other side of the mounting groove.

5. The photovoltaic module according to claim 4, characterized in that: For two adjacent intermediate busbars (31) connected to the same junction box (60), the two ends extending out of the first groove structure (51) have the same orientation and are consistent with the extension direction of the first groove structure (51) of the protruding structure.

6. The photovoltaic module according to claim 4, characterized in that: The junction box (60) further comprises: busbar connection grooves (63) arranged on both sides of the installation groove (61), wherein: The electrical connection portion (62) is arranged in the busbar connection groove (63); One end of the middle busbar (31) extending out of the first groove structure (51) is embedded in the busbar connecting groove (63).

7. The photovoltaic module according to claim 4, characterized in that: The junction box (60) further comprises: two split parts (64), wherein: The diode module included in the junction box (60) is arranged on one of the split parts (64), and the diode module is electrically connected to the two electrical connection parts (62); The two split parts (64) are detachably connected and surround the installation groove (61); The two electrical connection parts (62) are respectively arranged on the two split parts (64).

8. The photovoltaic module according to any one of claims 1, 2 and 4 to 7, characterized in that: The battery array (30) further comprises: an edge bus strip (33) placed vertically and connected in series with the battery string; the back plate (50) further comprises a third groove structure (53) corresponding to the edge bus strip (33); wherein the edge bus strip (33) is embedded in the third groove structure (53); Alternatively, the battery array (30) further includes: a vertically placed edge bus band (33) connected in series with the battery string; the back panel (50) further includes a third groove-shaped structure (53) corresponding to the edge bus band (33); the back packaging film (40) includes a fourth groove-shaped structure (42) corresponding to the edge bus band (33); wherein the fourth groove-shaped structure (42) is embedded in the third groove-shaped structure (53), and the edge bus band (33) is embedded in the fourth groove-shaped structure (42).

9. The photovoltaic module according to claim 7, characterized in that: The junction box (60) further comprises: a shell (66) arranged around the two split parts (64) and two through holes (65) respectively arranged at two ends of the shell (66), wherein: The two through holes (65) correspond to the mounting groove (61), and a connecting line of the two through holes (65) is consistent with an extending direction of the mounting groove (61); The housing (66) is used for containing sealant.

10. The photovoltaic module according to claim 9, characterized in that: The junction box (60) further comprises: a sealing cover (67), wherein: The sealing cover (67) is covered on the shell (66) and is used to seal the two split parts (64) in the space enclosed by the shell (66) and the sealing cover (67).

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