Non-main-grid negative-spacing photovoltaic module
Through the design of the main gate-free negative pitch photovoltaic module, the negative pitch layout of the cell is achieved by using the load-bearing membrane clamping welding tape, which solves the problem of traditional photovoltaic modules being prone to cracking and short circuit under small patches, improves the module performance and power generation efficiency, and reduces costs.
Patent Information
- Application Number
- CN202421946817.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-08-12
AI Technical Summary
Traditional photovoltaic modules are prone to hidden cracks and short circuit problems under small-pitch design, and the existing technology is complex and costly, making it difficult to achieve large-scale production.
The main gate-free negative pitch photovoltaic module design is adopted. By clamping welding tapes with front and back bearing films between the cells, the negative pitch layout of the cell is achieved to avoid hidden cracks, and the insulating material is used to play a soft support role during lamination. It is suitable for all types of cell and special-shaped cell.
The power generation area and power of photovoltaic modules are improved, and the material cost is reduced, while no additional process steps or equipment modification is required, which improves the overall performance of the module.
Smart Images
Figure CN223125217U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of components that are sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength, or particle radiation and are specially suitable for converting such radiation energy into electrical energy, and specifically to a main grid-free negative spacing photovoltaic module. Background Art
[0002] In the string welding process of traditional photovoltaic modules, the welding strip and the main grid on the surface of the cell are usually welded into a cell string at a high temperature of 200℃. In the layout design of the cell string, the spacing between the cells is usually designed to be 0.5-2mm. In order to improve the power of traditional photovoltaic modules, reducing the layout gap of the module has become one of the important means.
[0003] However, the smaller the cell spacing of traditional photovoltaic modules, the higher the risk of hidden cracks and breakage of the cell, and after lamination, it is easy to have hidden cracks in the welding strips between batches of cells; the string spacing of the stacked layout design usually ranges from 1 to 3 mm, and the string spacing of traditional photovoltaic modules less than zero will cause internal short circuits in the modules; the existing technology will solve the insulation problem between strings through the gap film solution, but it requires the modification or addition of related equipment, and the process complexity and cost are increased at the same time.
[0004] In summary, the feasibility of mass production of negative spacing layout design of traditional photovoltaic modules is low. Utility Model Content
[0005] The purpose is to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a main grid-free negative spacing photovoltaic module, and the technical solution adopted includes:
[0006] A main grid-free negative spacing photovoltaic module comprises a plurality of battery strings arranged in sequence from left to right, each battery string comprises a plurality of battery cells and a plurality of welding strips arranged in sequence from front to back, each battery cell comprises a back support film, a battery cell body and a front support film arranged in sequence from top to bottom, two adjacent battery cells are respectively a front battery cell and a rear battery cell from front to back, the front end of the front support film of the rear battery cell extends to the front side of its battery cell body, the front part of the rear battery cell is overlapped and placed on the front battery cell, the front end of each welding strip is arranged between the back support film and the battery cell body of the front battery cell, and the rear end thereof extends between the front support film and the battery cell body of the rear battery cell.
[0007] Multiple of the battery strings are combined by busbars to form a photovoltaic module. The battery cells are main-gridless battery cells. The negative spacing scheme is applicable to various types of battery cells such as PERC, HJT, and TOPcon, and is also applicable to various sizes including regular or irregularly shaped battery cells with different lengths and widths. For example, for a regular 182-type module with unchanged size, the battery cells of the negative-spacing photovoltaic module can be enlarged to 184.2 * 93.3 mm; for a regular 210-type module with unchanged size, the battery cells of the negative-spacing photovoltaic module can be enlarged to 212.5 * 106.6 mm.
[0008] Preferably, the front end of the front bearing film of the rear battery cell extends 1 - 2 mm to the front side of its battery cell body.
[0009] The front bearing film and the back bearing film include but are not limited to EVA / POE / EPE. Their characteristic is that under high-temperature baking at about 110°C, they have certain shrinkage and adhesiveness, and can stick the solder ribbon tightly to the battery cell for fixation; at the same time, they have low fluidity during the lamination process at 100 - 150°C. Their width can be customized according to the size of the battery cell, and the cutting length can be adjusted according to the size of the battery cell and the process requirements. In this application, the head and tail ends of the solder ribbon should be clamped between the bearing film and the battery cell body to prevent short circuits and avoid displacement of the solder ribbon during subsequent lamination processes.
[0010] As a preferred embodiment of this application, the overlapping distance between the front battery cell and the rear battery cell is 0.2 - 1 mm.
[0011] As a preferred embodiment of this application, the four corners of the battery cell have no chamfers or the chamfered edges are less than 7 mm, and the string spacing between two adjacent battery strings is 1 - 2 mm.
[0012] When the battery cell is a non-chamfered or slightly chamfered half cell, the negative string spacing layout will form multiple layers of overlap at the chamfered position of the battery cell, and lamination is likely to cause defective broken pieces; at this time, the string spacing distance between two adjacent battery strings should be 1 - 2 mm; and the left and right width of the front bearing film is narrower than the left and right width of the battery cell body to avoid the excess bearing film affecting the battery string layout and causing uneven string spacing problems.
[0013] As another preferred embodiment of this application, the four corners of the battery cell have chamfers and the chamfered edges are greater than or equal to 7 mm. Two adjacent battery strings are a left battery string and a right battery string, and the left side of the right battery string is overlapped and placed on the front bearing film of the left battery string.
[0014] When the solar cell is a half cell with 4 chamfers and the chamfer is ≥ 7 mm, the string spacing can be negative spacing at this time; the overlapping distance of the string spacing is between 0.2 and 1 mm; that is, the overlapping distance between the right solar cell string and the left solar cell string is 0.2 - 1 mm. Further, the left and right sides of the front carrier film respectively extend beyond the left and right sides of the corresponding solar cell body. In this solution, the width of the carrier film is 1 - 2 mm wider than the solar cell, so that when the solar cell strings are arranged with negative string spacing, the overlapping position is sandwiched with the front carrier film and the back carrier film, which can play an insulating role between the two strings of solar cells and effectively prevent the solar cells from short - circuiting.
[0015] Advantages of the utility model:
[0016] Since the front carrier film itself is an insulating material, and the front carrier film of the rear solar cell is moved forward, the front overlap of the rear solar cell is placed on the front solar cell, and the forward - moved part of the front carrier film of the rear solar cell is clamped between the front solar cell and the rear solar cell. During lamination, the front carrier film plays a soft - support role between the two solar cells. While realizing the negative - spacing layout of the solar cells, it avoids the generation of hidden cracks and defects due to the contact between the solar cells and the welding tape during lamination;
[0017] The negative - spacing layout of the solar cells can effectively increase the power - generation area of the photovoltaic module. Compared with the conventional - layout module of the same size, the power of the photovoltaic module is increased by 1 - 2%;
[0018] According to the negative - spacing layout design of the photovoltaic module in this application, the traditional solar cells can reduce the overall size of the photovoltaic module and lower the material cost;
[0019] The photovoltaic module described in this application is applicable to large - size special - shaped solar cells;
[0020] For the main - grid - free photovoltaic module described in this application, there is no need to add new process steps or equipment transformation during the manufacturing process. Only by changing the settings of the size and position of the carrier film using the original production equipment can the negative spacing of the main - grid - free photovoltaic module be realized. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The above - mentioned and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:
[0022] Figure 1 It is a cross - sectional schematic view of a solar cell string with negative cell spacing in Embodiment 1;
[0023] Figure 2 It is a layout schematic view of the back surface of a photovoltaic module with negative cell spacing in Embodiment 1;
[0024] Figure 3 It is a cross - sectional schematic view of a photovoltaic module with negative string spacing in Embodiment 2;
[0025] Figure 4 It is a layout schematic diagram of the back side of a photovoltaic module with a negative string pitch in Embodiment 2. Specific Embodiments
[0026] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the drawings. The role of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention. However, it should not be construed as a limitation on the protection scope of the present invention.
[0027] In the description of the present invention, the meaning of "a plurality of" is more than two. Understandings such as "greater than", "less than", and "exceeding" do not include the present number, and understandings such as "above", "below", and "within" include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.
[0028] In the description of the present invention, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by "up", "down", "front", "back", "left", "right", etc., is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present invention.
[0029] In the present invention, unless otherwise clearly defined, terms such as "arranged", "installed", and "connected" should be understood in a broad sense. For example, they can be directly connected, or indirectly connected through an intermediate medium; they can be fixedly connected, or detachably connected, and can also be integrally formed; they can be mechanically connected; they can be the communication inside two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.
[0030] Embodiment 1
[0031] Referring to the attached Figure 1-2 As shown, Embodiment 1 proposes a photovoltaic module with a negative film pitch, where:
[0032] The size of the cell 20 is a half cell of 182*91 mm or two half cells obtained by scribing a whole cell of 182*182 mm.
[0033] The left and right width of the front carrier film 24 is 180 mm, and the cutting length is 91 mm.
[0034] The left and right width of the back carrier film 25 is 180 mm, and the cutting length is 85 mm.
[0035] The battery cell body is placed centered between the front carrier film 24 and the back carrier film 25, making all the front carrier films 24 and the back carrier films 25 flush with the left and right sides of the battery cell 20, avoiding the carrier films extending beyond the battery cell 20 and affecting the layout;
[0036] All the front carrier films 24 are moved forward by 2 mm, leaving a 2-mm gap between the rear side of the front carrier film 24 and the rear edge of the battery cell body 23;
[0037] A 0-1-mm gap is left between the front end of all the back carrier films 25 and the same-side edge of the battery cell body 23, and a 5-6-mm gap is left between the rear end of the back carrier film 25 and the same-side edge of the battery cell body 23 for convenient maintenance;
[0038] The front end of the solder ribbon 30 is connected to the back of the battery cell body 23 of the front battery cell, and the rear end is connected to the front of the battery cell body 23 of the rear battery cell. A 2-mm gap is left between the head of the solder ribbon 30 and the edges of the two battery cell bodies 23;
[0039] Among them, the overlapping distance between the battery cells 20 is 0.9 mm, and the string pitch is 1.6 mm;
[0040] According to the above example, the size of 144 half-cell modules is 2223*1134 mm. Compared with the layout of the conventional 1.6-mm cell pitch, the size is reduced by 55*1134 mm, and the area of the same-efficiency module is reduced by about 2.4%.
[0041] Embodiment 2
[0042] Refer to the attached Figure 3-4 As shown, Embodiment 2 is a photovoltaic module with a negative cell pitch and a negative string pitch, where:
[0043] Taking the conventional 182-72 format as an example, the size of 2278*1134 mm remains unchanged. By changing the size of the battery cell 20 and arranging it with a negative cell pitch + negative string pitch, the purpose of improving the module power is achieved;
[0044] The size of the battery cell 20 is a 184.2*93.3-mm half-cell. The four corners of the battery cell 20 are chamfered, and the chamfered side ≥ 7 mm;
[0045] The left and right width of the front carrier film 24 is 188 mm, and the cutting length is 93 mm;
[0046] The left and right width of the back carrier film 25 is 188 mm, and the cutting length is 87 mm;
[0047] The battery cell body is placed centered between the front carrier film 24 and the back carrier film 25;
[0048] All the front carrier films 24 are moved forward by 2 mm, leaving a 2-mm gap between the rear side of the front carrier film 24 and the rear edge of the battery cell body 23;
[0049] For all of them, there is a clearance of 0 - 1 mm between the front end of the back bearing film 25 and the same - side edge of the battery cell body 23, and a clearance of 5 - 6 mm between the rear end of the back bearing film 25 and the same - side edge of the battery cell body 23, which is convenient for maintenance;
[0050] The front end of the solder ribbon 30 is connected to the back of the battery cell body 23 of the front battery cell, and the rear end is connected to the front of the battery cell body 23 of the rear battery cell. There is a clearance of 2 mm between the head of the solder ribbon 30 and the edges of the two battery cell bodies 23;
[0051] The overlapping distance between battery cells 20 is 0.9 mm.
[0052] Refer to the attached Figure 4 As shown, on both the left and right sides of the front bearing film 24 and the back bearing film 25, they extend 1 - 2 mm outside the corresponding battery cell body 23 to completely wrap the left and right sides of the battery cell 20. Thus, the front bearing film 24 and the back bearing film 25 completely wrap the left and right sides of the battery cell 20, playing an insulating role;
[0053] The battery strings are arranged in sequence from left to right, and the left side of the right - hand battery string overlaps and is placed on the left - hand battery. The string spacing is - 1 mm. Multiple battery strings 10 with negative cell spacing are arranged with a negative string spacing. Different from the conventional 182 - 72 format, the cell spacing and string spacing gaps are fully utilized, and the area of about 3.5 half - cells can be increased. The format size of 2278 * 1134 mm remains unchanged, and the module power can be increased by about 2%.
[0054] Embodiment 3
[0055] Embodiment 3 is a photovoltaic module with negative cell spacing using special - shaped battery cells 20, where:
[0056] The battery cell 20 adopts the conventional 182 - 72 format, and the size of the battery cell 20 is a half - cell of 182 * 91 mm or two half - cells obtained by scribing a whole cell of 182 * 182 mm;
[0057] The left - right width of the front bearing film 24 is 180 mm, and the cutting length is 91 mm;
[0058] The left - right width of the back bearing film 25 is 180 mm, and the cutting length is 90 mm;
[0059] All the front bearing films 24 are moved forward by 2 mm, and there is a clearance of 2 mm between the rear side of all the front bearing films 24 and the rear - end edge of the battery cell body 23;
[0060] For all of them, there is a clearance of 0 - 1 mm between the front end of the back bearing film 25 and the same - side edge of the battery cell body 23, and a clearance of 5 - 6 mm between the rear end of the back bearing film 25 and the same - side edge of the battery cell body 23, which is convenient for maintenance;
[0061] The front end of the welding strip 30 is connected to the back surface of the cell body 23 of the front cell, and the rear end is connected to the front surface of the cell body 23 of the rear cell. A 2-mm gap is left between the head of the welding strip 30 and the edges of the two cell bodies 23.
[0062] The overlapping position between the cells 20 is 0.9 mm. Multiple cells 20 are connected in series to form a main-grid-free negative-spacing cell string 10, and then the main-grid-free negative-spacing cell strings 10 are arranged into a module with a string spacing of 1.6 mm. According to this layout, the size of 108 half-cell modules is 1772*1134 mm.
[0063] Certainly, the present utility model is not limited to the above embodiments. Those skilled in the art can make equivalent deformations or substitutions without departing from the spirit of the present utility model, and these equivalent deformations and substitutions are all included in the scope defined by the claims of this application.
Claims
1. A main-gridless negative-spacing photovoltaic module, characterized in that, It includes multiple cell strings (10) arranged in sequence from left to right. Each cell string (10) respectively includes multiple solar cells (20) and multiple solder tapes (30) arranged in sequence from front to back. Each solar cell (20) respectively includes a back carrier film (25), a solar cell body (23), and a front carrier film (24) arranged in sequence from top to bottom. The adjacent two solar cells (20) are respectively a front solar cell (22) and a rear solar cell (21) from front to back. The front end of the front carrier film (24) of the rear solar cell (21) extends to the front side of its solar cell body (23). The front part of the rear solar cell (21) is overlapped and placed on the front solar cell (22). The front end of each solder tape (30) is arranged between the back carrier film (25) and the solar cell body (23) of the front solar cell (22), and its rear end extends between the front carrier film (24) and the solar cell body (23) of the rear solar cell (21).
2. The ownerless grid negative-spacing photovoltaic module according to claim 1, wherein The overlapping distance between the front solar cell (22) and the rear solar cell (21) is 0.2 - 1 mm.
3. The ownerless grid negative-spacing photovoltaic module according to claim 1, wherein The four corners of the solar cell (20) have no chamfer or the chamfered edge is less than 7 mm. The string pitch between adjacent two cell strings (10) is 1 - 2 mm.
4. The ownerless grid negative-spacing photovoltaic module according to claim 3, wherein, The left - right width of the front carrier film (24) is narrower than the left - right width of the solar cell body (23).
5. The ownerless grid negative-spacing photovoltaic module according to claim 1, characterized in that, The four corners of the solar cell (20) have chamfers and the chamfered edge is greater than or equal to 7 mm. The adjacent two cell strings (10) are respectively a left cell string and a right cell string. The left side of the right cell string is overlapped and placed on the left cell string.
6. The ownerless grid negative-spacing photovoltaic module according to claim 5, wherein The overlapping distance between the right cell string and the left cell string is 0.2 - 1 mm.
7. The ownerless grid negative-spacing photovoltaic module according to claim 5, wherein The left and right sides of the front carrier film (24) respectively extend out of the left and right sides of the corresponding solar cell body (23).
8. The ownerless grid negative-spacing photovoltaic module according to claim 7, wherein The left and right sides of the front carrier film (24) respectively extend 1 - 2 mm out of the corresponding solar cell body (23).