Electrode structure of slice solar cell, slice solar cell and photovoltaic module
By introducing barrier gate lines into the electrode structure of the sliced solar cell to protect the pad, the problem of repairing the film layer covering the welding area is solved, and the welding stability and performance of photovoltaic modules are improved.
Patent Information
- Application Number
- CN202421180215.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-28
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-05-28
AI Technical Summary
During the repair of the cutting surface of the sliced solar cell, the repair film layer is easily covered by the welding area, affecting the welding stability, and thus affecting the photoelectric conversion efficiency and yield of the photovoltaic module.
Design an electrode structure for sliced solar cells, including a bus assembly and a barrier gate line. The barrier gate line is located outside the designated pad and the height is higher than or equal to the pad height, which plays a role in protecting the pad and preventing the repair film layer from covering.
By setting the barrier gate lines, the stability of welding tape is improved, the welding defects are reduced, and the efficiency and yield of photovoltaic modules are improved.
Smart Images
Figure CN222786264U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of solar cells, in particular to an electrode structure of a sliced solar cell, a sliced solar cell and a photovoltaic component. Background Art
[0002] In the production and processing of photovoltaic modules, the whole cell sheet is cut to obtain sliced solar cells. During the process of repairing the cut surface of the sliced solar cell, part of the repair film layer will cover the welding area of the sliced solar cell, affecting the welding stability of the sliced solar cell, and ultimately affecting the photoelectric conversion efficiency and yield of the photovoltaic module. Utility Model Content
[0003] The utility model discloses an electrode structure of a sliced solar cell, a sliced solar cell and a photovoltaic module, which can protect the welding pad, thereby improving the stability of welding of the welding strip.
[0004] In a first aspect, an embodiment of the present application discloses an electrode structure of a sliced solar cell, the electrode structure comprising: a busbar assembly, the busbar assembly comprising a busbar line and a pad connected to the busbar line;
[0005] A blocking grid line, at least corresponding to a side of the sliced solar cell having a cutting surface, the blocking grid line is located outside a designated pad, and the designated pad is the pad having the shortest distance to the outermost bus grid line;
[0006] The height of the blocking gate line is higher than or equal to the height of the pad.
[0007] Furthermore, the blocking gate lines are continuous long strip-shaped gate lines, and the number of the blocking gate lines is greater than or equal to one.
[0008] Furthermore, the number of the blocking gate lines is 4, the 4 blocking gate lines are connected end to end to form a frame-type gate line, the frame-type gate line is located between the designated pad and the outermost bus gate line, and / or the frame-type gate line is arranged at the outermost bus gate line.
[0009] Furthermore, the blocking gate line is a closed graphic structure, and the graphic structure wraps any of the designated pads.
[0010] Furthermore, the blocking grid lines include light-receiving-side blocking grid lines and backlight-side blocking grid lines;
[0011] In the normal direction of the light-receiving surface, the positions of the light-receiving surface blocking grid lines are the same as or staggered with the positions of the backlight surface blocking grid lines.
[0012] Furthermore, the barrier grid lines are arranged around the outermost bus grid lines; and / or,
[0013] The height of the barrier gate lines is higher than or equal to the height of the bus gate lines; and / or,
[0014] The height of the blocking gate line is greater than or equal to 1 μm; and / or,
[0015] The width of the blocking gate line is 10 μm to 1 mm.
[0016] In a second aspect, an embodiment of the present application discloses a sliced solar cell, which includes the electrode structure of the first aspect.
[0017] Further, the blocking grid lines include light-receiving surface blocking grid lines and backlight-receiving surface blocking grid lines, and in the normal direction of the light-receiving surface, the positions of the light-receiving surface blocking grid lines and the backlight-receiving surface blocking grid lines are the same as or staggered;
[0018] When the number of the sliced solar cells is multiple and the multiple sliced solar cells are stacked along the normal to the light-receiving surface, two adjacent sliced solar cells have a gap in the normal to the light-receiving surface, and the backlight blocking grid lines of one of the sliced solar cells are arranged opposite to the light-receiving surface blocking grid lines of another adjacent sliced solar cell to form a blocking barrier, and the blocking barrier is configured to prevent external gas from entering the gap.
[0019] Furthermore, the electrode structure is used to be placed in a jig to repair the cut surface, and the jig includes: a bottom plate, a top plate, and a side plate connected between the bottom plate and the top plate, the bottom plate, the top plate and the side plate enclose a cavity with an opening on one side, the sliced solar cell is configured to be placed in the cavity, and the cut surface is configured to be exposed from the opening.
[0020] In a third aspect, an embodiment of the present application discloses a photovoltaic module, which includes the sliced solar cell of the second aspect.
[0021] Compared with the prior art, the beneficial effects of this application include:
[0022] The present application provides an electrode structure for a sliced solar cell, which can reduce the impact of repairing the cut surface of the sliced solar cell on the main welding area in the electrode structure, and is conducive to improving the welding stability of the sliced solar cell. The electrode structure of the present application is provided with a blocking grid line at least on one side corresponding to the cut surface of the sliced solar cell. Since the blocking grid line is located outside the designated pad (the pad with the shortest distance from the outermost bus grid line), and the outermost bus grid line is close to the edge of the sliced solar cell, that is, the blocking grid line is located at a position close to the edge of the sliced solar cell, and the height of the blocking grid line is greater than or equal to the height of the pad, during the process of repairing the cut surface of the sliced solar cell, the repair gas from the external environment will be intercepted by the blocking grid line and it is difficult to enter the electrode structure. Therefore, the setting of the blocking grid line plays a protective effect on the pad from the outermost side of the electrode structure, and the blocking repair film layer covers the pad, reducing the undesirable phenomenon of the welding strip, improving the welding stability of the sliced solar cell, and improving the efficiency and yield of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0024] Figure 1 is a top view of the electrode structure of an embodiment of the present application;
[0025] Figure 2 This is an embodiment of the present application Figure 1 A is an enlarged schematic diagram;
[0026] Figure 3 is a schematic structural diagram of a passivated contact solar cell having a first electrode structure according to an embodiment of the present application;
[0027] Figure 4 It is a schematic diagram of the structure of an emitter and back-passivated solar cell having a first electrode structure according to an embodiment of the present application;
[0028] Figure 5 is a schematic structural diagram of an emitter and back-side passivated solar cell having a second electrode structure according to an embodiment of the present application;
[0029] Figure 6 is a top view of the electrode structure of an embodiment of the present application (the busbar lines in the middle area are omitted);
[0030] Figure 7 a is a first deformation structure of a closed figure in the electrode structure of the embodiment of the present application;
[0031] Figure 7 b is a second deformation structure of the closed figure in the electrode structure of the embodiment of the present application;
[0032] Figure 7 c is a third deformation structure of the closed figure in the electrode structure of the embodiment of the present application;
[0033] Figure 8 It is a schematic structural diagram of the light-receiving side blocking grid lines and the back-light-receiving side blocking grid lines of the emitter and back-passivated solar cell in the embodiment of the present application;
[0034] Fig. 9 This is a schematic diagram of the structure of the first type of blocking barrier formed by stacking sliced solar cells in an embodiment of the present application;
[0035] Fig.10 is a schematic diagram of the structure of the second blocking barrier formed by stacking sliced solar cells in an embodiment of the present application;
[0036] Fig.11 This is a schematic diagram of the structure of the third type of blocking barrier formed by stacking sliced solar cells in an embodiment of the present application;
[0037] Fig.12 is a schematic diagram of repairing the cut surface of stacked sliced solar cells in an embodiment of the present application;
[0038] Fig.13 It is a schematic diagram of the structure of the fixture provided in the embodiment of the present application;
[0039] Fig.14 It is a schematic diagram of using a jig to repair the cut surface of stacked sliced solar cells according to an embodiment of the present application (one side plate of the jig is omitted).
[0040] Icons: 100, electrode structure; 2, busbar line; 21, outermost busbar line; 3, pad; 31, designated pad; 4, blocking line; 41, light-receiving side blocking line; 42, backlight side blocking line; 43, blocking barrier; 5, fixture; 51, bottom plate; 52, top plate; 53, side plate. DETAILED DESCRIPTION
[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0042] In the present invention, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.
[0043] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.
[0044] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.
[0045] The technical solution provided by the utility model will be further described below in conjunction with embodiments and drawings.
[0046] The surface recombination rate of the cut surface of the sliced solar cell is very high, which has a great impact on the electrical performance of the solar cell. In order to improve the performance of photovoltaic modules, it is necessary to deposit a repair film layer on the cut surface of the sliced solar cell. The preparation of the repair film layer is prepared by depositing gas and then activating it after high temperature treatment. During the gas deposition process, the deposition gas will diffuse to the pads and busbars of the sliced solar cell, so that the pads and busbars of the sliced solar cell have the phenomenon of plating around.
[0047] During the process of serial welding of multiple sliced solar cells, the welding ribbon and the pad of the sliced solar cell are alloyed and then solidified, thereby realizing the welding of the welding ribbon and the sliced solar cell. However, due to the presence of plating on the pad of the sliced solar cell, the contact between the welding ribbon and the pad is blocked, which increases the difficulty of forming an alloy between the welding ribbon and the pad, affects the stability of the welding of the welding ribbon, and thus has an adverse effect on the reliability, yield and photoelectric conversion efficiency of the photovoltaic module. Based on the above problems, the present application provides an electrode structure of a sliced solar cell, which can improve the stability of the welding of the welding ribbon and improve the photoelectric conversion efficiency of the photovoltaic module.
[0048] In a first aspect, the present application provides an electrode structure of a sliced solar cell, such as Figure 1 to Figure 2 As shown, the electrode structure 100 includes:
[0049] A bus assembly, the bus assembly comprising a bus grid line 2 and a pad 3 connected to the bus grid line 2;
[0050] The barrier grid line 4 corresponds to at least one side of the sliced solar cell having the cut surface, and the barrier grid line 4 is located outside the designated pad 31, and the designated pad 31 is the pad 3 with the shortest distance to the outermost bus grid line 21;
[0051] The height of the blocking gate line 4 is higher than or equal to the height of the pad 3 .
[0052] The busbar line 2 includes a main grid and a secondary grid which are perpendicular to each other. The secondary grid is used to collect current, and the main grid collects the current collected by the secondary grid and then outputs it. The outermost busbar line 21 refers to the busbar line 2 which is closest to the edge of the sliced solar cell. Figure 2 As shown, the distance between the designated pad 31 and the outermost bus grid line 21 is the shortest, and the blocking grid line 4 is located on the outer side of the designated pad 31, so the distance between the blocking grid line 4 and the outermost bus grid line 21 is smaller than the distance between the designated pad and the outermost bus grid line 21. Therefore, in the process of repairing the cut surface of the sliced solar cell, the external gas will be blocked by the blocking grid line 4 in the process of diffusing from the cutting surface to the area where the pad 3 is located, which inhibits the diffusion of the gas to the pad 3, thereby protecting the pad 3 of the sliced solar cell and reducing the degree of plating on the pad 3.
[0053] And, if Figure 3 to Figure 4 As shown, the electrode structure 100 can be applied to different types of solar cells such as passivated contact solar cells, emitter and back-passivated solar cells.
[0054] The electrode structure 100 provided in the present application has a blocking grid line 4 provided on at least one side corresponding to the cut surface of the sliced solar cell, and the position of the blocking grid line 4 corresponds to the outer side of the designated pad 31, and the designated pad 31 is the pad 3 with the shortest distance to the outermost bus grid line 21, so that the height of the blocking grid line 4 is higher than or equal to the height of the pad 3. Therefore, the blocking grid line 4 can be used as a protective barrier, and in the process of repairing the cut surface, it can effectively prevent the repair film layer from covering the pad 3, thereby improving the stability of welding between the pad 3 and the welding strip, and improving the photoelectric conversion efficiency, yield and reliability of the photovoltaic module. In addition, the blocking grid line 4 can not only serve as a protective barrier, but also play a role in collecting current, reducing the transmission path of photogenerated charges, thereby helping to increase the photoelectric conversion efficiency of the photovoltaic module.
[0055] The pad 3 is a welding point when the welding strip is welded, and is an important structure that affects the welding stability of the welding strip. Therefore, by effectively protecting the pad 3, the effect of improving the welding strip welding can be achieved. By making the height of the blocking grid line 4 higher than or equal to the height of the pad 3, the pad 3 can be protected. Figure 4 As shown in FIG. 1 , when the height of the blocking grid line 4 is higher than the height of the pad 3, the gas is blocked by the blocking grid line 4 during diffusion from the cut surface of the sliced solar cell to the inside, resulting in a longer gas diffusion path, which helps to improve the protection effect of the pad 3 and reduce the degree of plating around the pad 3; Figure 5 As shown, when the height of the blocking gate line 4 is just equal to the height of the pad 3 , the blocking gate line 4 can also block the entry of gas, thereby reducing the degree of plating around the pad 3 .
[0056] Among them, the height of the blocking grid line 4 is higher than the height of the pad 3, which can be achieved by overprinting or by individually designing the printed screen. In an optional embodiment, the printing process of the blocking grid line 4 adopts an overprinting method. Specifically, a conventional printed screen is first used to print at the position of the blocking grid line 4, and then printed again at the same position, so that the height of the prepared blocking grid line 4 is higher than the height of the pad 3. This preparation method does not require an individual design of the printed screen, and can be printed multiple times in the area of the blocking grid line 4 according to the structure of the busbar line 2, which is more practical. In another optional embodiment, the structure of the printed screen is designed so that the thickness of the printed screen at the blocking grid line 4 is higher, so the blocking grid line 4 can be obtained by designing the printed screen, thereby improving the efficiency and accuracy of printing.
[0057] Furthermore, if Figure 6 As shown, the blocking grid lines 4 are continuous long strip grid lines, and the number of the blocking grid lines 4 is greater than or equal to 1. The more the number of the blocking grid lines 4 is, the better the blocking effect on the repair gas is, which effectively reduces the plating around the pad 3 area, and because the blocking grid lines 4 are continuous long strip grid lines, in addition to protecting the pad 3, they can also reduce the plating around the bus grid lines 2, which can effectively reduce the transmission path of the photogenerated charge, thereby improving the photoelectric conversion efficiency of the photovoltaic module.
[0058] Furthermore, the minimum number of barrier grid lines 4 corresponds to the number of cut surfaces of the sliced solar cell. Since the number of cut surfaces of the sliced solar cell includes 1, 2, 3, and 4, the minimum number of barrier grid lines 4 corresponding to the number of cut surfaces is 1, 2, 3, and 4 respectively.
[0059] In an optional embodiment, when the number of the blocking grid lines 4 is 1, since the gas directly acts on the cut surface of the sliced solar cell during the preparation of the repair film layer, the plating around the designated pad 31 corresponding to the cut surface is more serious, so the blocking grid line 4 is arranged in the cut surface area to reduce the plating around the area, thereby improving the stability of the soldering of the solder strip; in another optional embodiment, as Figure 1 As shown, the number of barrier grid lines 4 is 4, and the 4 barrier grid lines 4 are connected end to end to enclose a frame grid line, and the frame grid line is located between the designated pads 31 and the outermost bus grid line 21, and / or the frame grid line is located at the outermost bus grid line 21. When the frame grid line surrounds the designated pads 31, the frame grid line can protect all the pads 3 and bus grid lines 2 of the sliced solar cell, thereby more effectively reducing the plating of the repair film layer of the sliced solar cell and improving the stability of the welding of the welding strip.
[0060] It should be noted that there is no solder pad on the outermost bus grid line, so the frame-type grid line is located between the designated solder pad 31 and the outermost bus grid line 21. At this time, the frame-type grid line protects all solder pads 3 and part of the bus grid lines 2, but does not protect the bus grid lines 2 outside the frame-type grid line. When the frame-type grid line is located on the outermost bus grid line 21, it can protect all the bus grid lines 2 and solder pads with a higher degree of protection, thereby effectively blocking the entry of gas and protecting the solder pads 3.
[0061] Furthermore, if Figure 7 a to Figure 7 As shown in FIG. 3 , the blocking gate line 4 is a closed graphic structure, and the graphic structure wraps any designated pad 31. When the blocking gate line 4 is a closed graphic structure, the graphic structure can be set to a circular, square, pentagonal, diamond or other shape, and different designated pads 31 can use the same graphic structure or different graphic structures. When any designated pad 31 is wrapped separately, this method can reduce the amount of slurry used. This is because the spacing between adjacent pads 3 is large and the area of a single pad 3 is small. Therefore, by designing the blocking gate line 4 of a single pad 3, the amount of slurry used can be reduced, thereby reducing the production cost.
[0062] Furthermore, if Figure 5 , Figure 8 As shown, the blocking lines 4 include light-receiving-side blocking lines 41 and backlight-receiving-side blocking lines 42 ; in the normal direction of the light-receiving surface, the positions of the light-receiving-side blocking lines 41 and the backlight-receiving-side blocking lines 42 are the same or staggered.
[0063] The sliced solar cell has a light-receiving surface and a backlight surface. The light-receiving surface is the light-absorbing surface, which belongs to the front of the sliced solar cell. This surface converts the absorbed light into electric charge, thereby converting light energy into electrical energy. The normal direction of the light-receiving surface refers to the direction perpendicular to the plane where the light-receiving surface is located, that is, the height direction of the sliced solar cell, specifically Figure 8 The Z direction in .
[0064] The number of light-receiving side blocking lines 41 corresponds to the number of backlight-receiving side blocking lines 42. At this time, after stacking a plurality of sliced solar cells along the normal direction, a blocking barrier 43 can be formed to reduce the plating degree of the pad 3. Figure 5 As shown, when the position of the light-receiving surface blocking grid line 41 is staggered with the position of the back-light-receiving surface blocking grid line 42, in an optional embodiment, one side of the light-receiving surface blocking grid line 41 and one side of the back-light-receiving surface blocking grid line 42 are on the same straight line; in another optional embodiment, there is a gap between the light-receiving surface blocking grid line 41 and the back-light-receiving surface blocking grid line 42, and at this time, the gas diffusion distance is increased, the blocking effect is better, and it helps to improve the stability of welding.
[0065] like Figure 8 As shown, when the position of the light-receiving side blocking lines 41 is the same as the position of the backlight-receiving side blocking lines 42 , the distance between the light-receiving side blocking lines 41 and the outermost bus bars 21 is equal to the distance between the backlight-receiving side blocking lines 42 and the outermost bus bars 21 .
[0066] Since there are barrier grid lines 4 around the outermost busbar lines 21, no matter how many cut surfaces the sliced solar cell has, the barrier grid lines 4 can protect all the pads 3 of the sliced solar cell, and prevent gas from being deposited on the pads 3, which can effectively improve the stability of welding. In addition, when barrier grid lines 4 are arranged around the sliced solar cell, the transmission paths of the photogenerated charges are increased, the transmission distance of the photogenerated charges is reduced, the transmission effect can be effectively improved, and the photoelectric conversion efficiency of the photovoltaic module is improved.
[0067] When the height of the busbar line 2 is higher than the height of the pad 3, the height of the barrier line 4 is adjusted to be higher than or equal to the height of the busbar line 2. The barrier line 4 not only protects the pad 3, but also protects the busbar line 2, thereby greatly reducing the plating degree of the pad 3 and the busbar line 2. On the one hand, by reducing the plating degree of the pad 3, the stability of welding is improved, and on the other hand, by reducing the plating degree of the busbar line 2, the transmission effect of the busbar line 2 on the photogenerated charge is avoided, thereby improving the photoelectric conversion efficiency of the photovoltaic module.
[0068] In addition, the height of the blocking grid line 4 is greater than or equal to 1 μm. Within this height range, the height of the blocking grid line 4 is higher than the height of the pad 3. Therefore, when the sliced solar cell is within this height range, it can have a better blocking effect on the gas, reduce the plating on the pad 3, and improve the stability of welding between the pad 3 and the soldering ribbon.
[0069] Moreover, when the width of the blocking grid line 4 is 10μm to 1mm, and the preferred range is 10μm to 100μm, this preferred range not only increases the transmission resistance of the gas, making it difficult to diffuse to the pad 3 area, reducing the degree of plating of the pad 3, but also does not cause waste of slurry, reduces production costs, and has a better convergence effect on photogenerated charges, reduces the transmission distance of photogenerated charges, and improves the photoelectric conversion efficiency of photovoltaic modules.
[0070] In a second aspect, an embodiment of the present application discloses a sliced solar cell, which includes the electrode structure 100 of the first aspect.
[0071] Further, the blocking grid lines 4 include light-receiving surface blocking grid lines 41 and backlight-receiving surface blocking grid lines 42. In the normal direction of the light-receiving surface, the positions of the light-receiving surface blocking grid lines 41 and the backlight-receiving surface blocking grid lines 42 are the same or staggered.
[0072] When there are multiple sliced solar cells and the multiple sliced solar cells are stacked along the normal to the light-receiving surface, two adjacent sliced solar cells have a gap in the normal to the light-receiving surface, and the backlight blocking grid line 42 of one of the sliced solar cells is arranged opposite to the light-receiving surface blocking grid line 41 of another adjacent sliced solar cell to form a blocking barrier 43, and the blocking barrier 43 is configured to prevent external gas from entering the gap.
[0073] In an optional embodiment, a plurality of sliced solar cells are stacked along the normal direction of the light-receiving surface, and two adjacent sliced solar cells have a gap in the normal direction of the light-receiving surface, and the backlight surface blocking grid lines 42 of one of the sliced solar cells are arranged opposite to the backlight surface blocking grid lines 42 of another adjacent sliced solar cell to form a blocking barrier 43.
[0074] In another optional embodiment, multiple sliced solar cells are stacked along the normal direction of the light-receiving surface, and two adjacent sliced solar cells have a gap in the normal direction of the light-receiving surface. The light-receiving surface blocking grid lines 41 of one of the sliced solar cells are arranged opposite to the light-receiving surface blocking grid lines 41 of another adjacent sliced solar cell to form a blocking barrier 43.
[0075] When the blocking barrier 43 is composed of the light-receiving-side blocking grid lines 41 and the backlight-side blocking grid lines 42, the stacking method of such sliced solar cells is helpful for subsequent production and processing, reduces the processing difficulty, and improves the processing efficiency.
[0076] like Fig. 9 As shown, when the position of the light-receiving surface blocking grid line 41 is the same as the position of the backlight-receiving surface blocking grid line 42, the heights of the light-receiving surface blocking grid line 41 and the backlight-receiving surface blocking grid line 42 are both equal to the height of the pad 3, and the lower edge of the light-receiving surface blocking grid line 41 and the upper edge of the backlight-receiving surface blocking grid line 42 are in abutment with each other, so that the light-receiving surface blocking grid line 41 and the backlight-receiving surface blocking grid line 42 form a blocking barrier 43 to prevent external gas from entering the gap between adjacent sliced solar cells.
[0077] When the position of the light-receiving side blocking grid line 41 is staggered from the position of the backlight-receiving side blocking grid line 42, the height of the light-receiving side blocking grid line 41 and the height of the backlight-receiving side blocking grid line 42 are both equal to the height of the pad 3, or one is equal to the height of the pad 3 and the other is higher than the height of the pad 3, or both are higher than the height of the pad 3. In an optional embodiment, as Fig.10 As shown, the side edge of the backlight blocking grid line 42 of a sliced solar cell contacts the side edge of the light-receiving side blocking grid line 41 of another sliced solar cell, which increases the path of gas transmission, thereby effectively improving the winding plating situation. In addition, the abutment also helps to prevent the gas from diffusing from the gap between the backlight blocking grid line 42 and the light-receiving side blocking grid line 41 to the pad 3 area, so the winding plating phenomenon can be reduced to a high degree; in another optional embodiment, as Fig.11 As shown, when the position of the light-receiving surface blocking grid line 41 is staggered with the position of the back-light-receiving surface blocking grid line 42, there is a gap between the side of the back-light-receiving surface blocking grid line 42 of one sliced solar cell and the light-receiving surface blocking grid line 41 of another sliced solar cell, which is conducive to forming a blocking barrier 43, increasing the gas transmission path, thereby effectively improving the winding plating situation.
[0078] like Fig.12 As shown, Fig.12 The arrow is the deposition direction of the gas. When the deposited gas diffuses toward the sliced solar cell, the barrier 43 plays a blocking role, reducing the amount of gas diffused to the pad 3, thereby reducing the degree of plating around the pad 3 and improving the stability of welding. In order to further reduce the degree of plating around the pad 3, other uncut surfaces can be protected during the preparation of the repair film layer, thereby reducing the contact degree between the gas and other uncut surfaces and reducing the degree of plating around the pad 3.
[0079] Specifically, Figure 13 to Figure 14 As shown, if the sliced solar cell is placed in a jig 5 for processing, the number of openings of the jig 5 corresponds to the cutting surface of the sliced solar cell, so that it can have a certain protective effect on the uncut plane and reduce the plating around the uncut plane.
[0080] Furthermore, the electrode structure 100 is used to be placed in a jig 5 to repair the cut surface. The jig 5 includes: a bottom plate 51, a top plate 52, and a side plate 53 connected between the bottom plate 51 and the top plate 52. The bottom plate 51, the top plate 52 and the side plate 53 enclose a cavity with an opening on one side. The sliced solar cell is configured to be placed in the cavity, and the cut surface is configured to be exposed from the opening.
[0081] like Fig.14 As shown, when the jig 5 is used to repair the cut surface of the sliced solar cell, the other surfaces of the sliced solar cell can be protected, and the degree of gas diffusion can be reduced, thereby reducing the degree of plating on other surfaces. By using the jig 5, combined with the gas blocking effect of the blocking grid line 4, the plating on the pad 3 of the sliced solar cell is further reduced, which helps to improve the stability of the welding between the pad 3 and the welding ribbon, and optimize the reliability, yield and photoelectric conversion efficiency of the photovoltaic module.
[0082] In a third aspect, the embodiment of the present application discloses a photovoltaic module, which includes the sliced solar cell of the second aspect. Since the photovoltaic module includes the sliced solar cell of the second aspect, the stability of the welding of the welding strip and the welding pad 3 during the preparation process of the photovoltaic module is good, and the reliability, yield and photoelectric conversion efficiency of the photovoltaic module are optimized.
[0083] The above is a detailed introduction to the electrode structure of a sliced solar cell, a sliced solar cell, and a photovoltaic module disclosed in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the electrode structure of a sliced solar cell, a sliced solar cell, and a photovoltaic module. At the same time, for those skilled in the art, according to the idea of the present utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present utility model.
Claims
1. An electrode structure of a sliced solar cell, characterized in that: The electrode structure comprises: A busbar assembly, the busbar assembly comprising a busbar line and a pad connected to the busbar line; A blocking grid line, at least corresponding to a side of the sliced solar cell having a cutting surface, the blocking grid line is located outside a designated pad, and the designated pad is the pad having the shortest distance to the outermost bus grid line; The height of the blocking gate line is higher than or equal to the height of the pad.
2. The electrode structure according to claim 1, characterized in that: The blocking gate lines are continuous long strip gate lines, and the number of the blocking gate lines is greater than or equal to one.
3. The electrode structure according to claim 2, characterized in that: The number of the blocking gate lines is 4, the 4 blocking gate lines are connected end to end to form a frame-shaped gate line, the frame-shaped gate line is located between the designated pad and the outermost bus gate line, and / or the frame-shaped gate line is arranged at the outermost bus gate line.
4. The electrode structure according to claim 1, characterized in that: The blocking gate line is a closed graphic structure, and the graphic structure wraps any of the designated pads.
5. The electrode structure according to any one of claims 1 to 4, characterized in that: The blocking grid lines include light-receiving-side blocking grid lines and backlight-side blocking grid lines; In the normal direction of the light-receiving surface, the positions of the light-receiving surface blocking grid lines are the same as or staggered with the positions of the backlight surface blocking grid lines.
6. The electrode structure according to any one of claims 1 to 4, characterized in that: The blocking grid lines are arranged around the outermost bus grid lines; and / or, The height of the barrier gate lines is higher than or equal to the height of the bus gate lines; and / or, The height of the blocking gate line is greater than or equal to 1 μm; and / or, The width of the blocking gate line is 10 μm to 1 mm.
7. A sliced solar cell, characterized in that: The sliced solar cell comprises the electrode structure according to any one of claims 1 to 6.
8. The sliced solar cell according to claim 7, characterized in that: The blocking grid lines include light-receiving surface blocking grid lines and backlight-receiving surface blocking grid lines. In the normal direction of the light-receiving surface, the positions of the light-receiving surface blocking grid lines and the backlight-receiving surface blocking grid lines are the same or staggered. When the number of the sliced solar cells is multiple and the multiple sliced solar cells are stacked along the normal to the light-receiving surface, two adjacent sliced solar cells have a gap in the normal to the light-receiving surface, and the backlight blocking grid lines of one of the sliced solar cells are arranged opposite to the light-receiving surface blocking grid lines of another adjacent sliced solar cell to form a blocking barrier, and the blocking barrier is configured to prevent external gas from entering the gap.
9. The sliced solar cell according to claim 8, characterized in that: The electrode structure is used to be placed in a jig to repair the cut surface. The jig includes: a bottom plate, a top plate, and a side plate connected between the bottom plate and the top plate. The bottom plate, the top plate and the side plate are combined to form a cavity with an opening on one side. The sliced solar cell is configured to be placed in the cavity, and the cut surface is configured to be exposed from the opening.
10. A photovoltaic module, characterized in that: The photovoltaic module comprises the sliced solar cell according to any one of claims 7 to 9.