Solar cell, cell string and photovoltaic module
By setting an isolation structure on the front of the solar cell, the problem of scratches on back-contact cells during stacking and storage is solved, and the cells are protected from damage before testing, thereby improving the yield and testing accuracy of the cells.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHUHAI FUSHAN AIKO SOLAR ENERGY TECH CO LTD
- Filing Date
- 2025-04-22
- Publication Date
- 2026-04-10
AI Technical Summary
When back-contact solar cells are stacked and stored, the grid structure of the upper cells can easily scratch the front of the lower cells. Existing protective measures such as photovoltaic separators and protective adhesives are costly, block light, or affect testing.
An isolation structure, including isolation adhesive dots or lines, is set on the front side of the solar cell to form a reserved hollow area to separate the upper and lower layers of cells, prevent scratches, and not affect the identification of the testing equipment during inspection.
It effectively protects the battery cells from wear and scratches, improving the yield rate. At the same time, the isolation structure set before testing does not affect the membrane color sorting test results, reducing production costs.
Smart Images
Figure CN224111578U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to solar cell technical field especially relates to a solar cell piece, cell string and photovoltaic module. BACKGROUND
[0002] The electrode of the back contact solar cell piece is all located at the back, and the front is completely free from metal grid lines or electrode shielding, which can maximize the use of incident light and improve the photoelectric conversion efficiency of the cell. However, since the front of the back contact solar cell piece has no protective structure, the front of the lower cell piece is easily scratched by the grid line structure on the back of the upper cell piece during stacking and storage, resulting in damage to the surface structure of the cell piece and poor cell products.
[0003] To solve the above problems, in the prior art, photovoltaic separator paper (such as sulfur-free paper) is usually placed between the upper and lower cell pieces, but the cost of the photovoltaic separator paper is high, and a large amount of storage space is required, and there is also the risk of powder and fiber falling, which still easily causes shading and slight scratches on the cell piece, affecting the yield of the cell piece.
[0004] Another solution in the prior art is to coat protective glue on the front of the cell piece to protect the cell piece, but since the protective glue will produce strong reflected light on the front of the cell piece, which will interfere with the film color sorting result of the detection equipment, the protective glue can only be coated after the film color sorting of the cell piece is completed, which will result in that the front of the cell piece is still unprotected during the film color sorting process, and the problem of wear and tear on the front of the cell piece still exists.
[0005] Therefore, there is an urgent need for a solar cell piece, cell string and photovoltaic module to solve the above problems. SUMMARY
[0006] Based on the above problems, the purpose of the utility model is to provide a solar cell piece, cell string and photovoltaic module, which can protect the solar cell piece from wear and tear during the production process, and at the same time, does not affect the film color sorting detection of the solar cell piece.
[0007] To achieve the above purpose, the utility model adopts the following technical scheme:
[0008] In a first aspect, a solar cell piece is provided, comprising:
[0009] A cell piece body has a front and a back, and the front is a light receiving surface;
[0010] An isolation structure is provided on the front of the cell piece body, and the isolation structure has a first reserved hollow area, and the area of a single first reserved hollow area is greater than or equal to 0.49cm 2 .
[0011] As an optional scheme of the solar cell sheet of the utility model, the isolation structure has a plurality of the first reserved hollow areas, the total area of the front of the cell sheet body is S1, the total area of all the first reserved hollow areas is S2, wherein S2 / S1 is greater than or equal to 20%.
[0012] As an optional scheme of the solar cell sheet of the utility model, the isolation structure includes a plurality of rows of first isolation glue points arranged at intervals along a first direction, a plurality of the first isolation glue points in the same row are distributed at intervals in a second direction, and the first direction and the second direction form an angle.
[0013] As an optional scheme of the solar cell sheet of the utility model, a plurality of the first isolation glue points in the same row are arranged flush in the second direction.
[0014] Alternatively, a plurality of the first isolation glue points in the same row are staggered in the second direction.
[0015] As an optional scheme of the solar cell sheet of the utility model, the isolation structure is provided with a reinforced protection area, a plurality of the first isolation glue points in the same row in the reinforced protection area are staggered in the second direction.
[0016] The distance between the reinforced protection area and the outer edge of the cell sheet body is W1, and the value range of W1 is 5mm≤W1≤50mm; the width of the reinforced protection area is W2, and the value range of W2 is 40mm≤W2≤50mm.
[0017] As an optional scheme of the solar cell sheet of the utility model, the total length of the projection of a plurality of rows of the first isolation glue points in the reinforced protection area in the first direction is greater than or equal to the width of the reinforced protection area in the first direction.
[0018] As an optional scheme of the solar cell sheet of the utility model, the isolation structure has a first strip-shaped area with a diagonal of the cell sheet body as a center line and a second strip-shaped area with a symmetry axis of the cell sheet body as a center line, at least one isolation glue line extending along the diagonal direction is arranged in the first strip-shaped area, at least one isolation glue line extending along the symmetry axis direction is arranged in the second strip-shaped area, and the first strip-shaped area and the second strip-shaped area form the first reserved hollow area.
[0019] As an optional scheme of the solar cell sheet of the utility model, the isolation structure is provided with a reinforced protection area, and a plurality of isolation glue lines are arranged at intervals in the reinforced protection area.
[0020] The distance between the reinforced protection area and the outer edge of the battery piece body is W1, and the value range of W1 is 5mm≤W1≤50mm; the width of the reinforced protection area is W2, and the value range of W2 is 40mm≤W2≤50mm.
[0021] As an optional scheme of the solar cell piece of the utility model, the number proportion of the first isolation glue line in the first belt-shaped area and the number proportion of the first isolation glue line in the second belt-shaped area are both less than the number proportion of the first isolation glue line in the reinforced protection area.
[0022] As an optional scheme of the solar cell piece of the utility model, the isolation glue line comprises a plurality of second isolation glue points which are arranged at intervals along the extension direction thereof.
[0023] As an optional scheme of the solar cell piece of the utility model, the isolation structure comprises a plurality of first glue lines and a plurality of second glue lines, the plurality of first glue lines are arranged at intervals along a third direction, the plurality of second glue lines are arranged at intervals along a fourth direction, the first glue lines and the second glue lines are cross-connected, and the third direction and the fourth direction form an angle.
[0024] As an optional scheme of the solar cell piece of the utility model, the width of the first glue line is 20μm-300μm;
[0025] And / or, the width of the second glue line is 20μm-300μm.
[0026] As an optional scheme of the solar cell piece of the utility model, the spacing between two adjacent first glue lines is 1mm-5mm;
[0027] And / or, the spacing between two adjacent second glue lines is 1mm-5mm.
[0028] As an optional scheme of the solar cell piece of the utility model, the isolation structure has a third reserved hollow area, and the third reserved hollow area is opposite to the area where the PAD point on the battery piece body is located.
[0029] As an optional scheme of the solar cell piece of the utility model, the isolation structure has a second reserved hollow area, and the second reserved hollow area surrounds the cutting area on the front surface, and the cutting area is configured to allow a cutting tool to cut the solar cell piece.
[0030] Secondly, a battery string is provided, which is cut from the solar cell piece.
[0031] Thirdly, a battery string is provided, which comprises the solar cell piece.
[0032] In a fourth aspect, there is provided a photovoltaic module comprising the cell string as described above.
[0033] The utility model discloses the beneficial effects are:
[0034] The solar cell piece, the cell string and the photovoltaic module provided by the utility model, by setting the isolation structure on the front of the cell piece body, the front and the back of the upper and lower solar cell pieces can be separated by the isolation structure when stacking and storing the solar cell piece in the later period, preventing the grid line structure on the back of the upper solar cell piece from scratching the front of the lower solar cell piece, and ensuring the yield of the cell piece product.
[0035] By setting the first reserved hollow area on the isolation structure, and the area of the first reserved hollow area is greater than or equal to 0.49cm 2 So that the front of the cell piece body can reserve a large enough area for the detection equipment to detect after setting the isolation structure, and the detection equipment can accurately identify the front of the cell piece body through the first reserved hollow area when detecting the solar cell piece by using the detection equipment (such as film color detection, surface defect detection, etc.), without affecting the detection process of the solar cell piece, so that the isolation structure can be set on the front of the cell piece body before the detection process, preventing the front of the solar cell piece from being worn and scratched during the detection process, ensuring that the cell piece product can be effectively protected throughout the production process, and thus improving the quality of the cell string and the photovoltaic module. BRIEF DESCRIPTION OF DRAWINGS
[0036] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the description of the embodiments of the utility model will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the utility model and these drawings without creating labor.
[0037] Figure 1 It is the schematic diagram of the solar cell piece provided by the embodiment one of the utility model;
[0038] Figure 2 It is the schematic diagram of the solar cell piece provided by the embodiment two of the utility model;
[0039] Figure 3 It is Figure 2 The local enlarged view of A in the figure;
[0040] Figure 4is a first schematic view of the solar cell provided by the embodiment three of the present application;
[0041] Figure 5 is a second schematic view of the solar cell provided by the embodiment three of the present application.
[0042] In the figure,
[0043] 1, cell body; 2, isolation structure;
[0044] 12, cutting area;
[0045] 201, first reserved hollow area; 202, first strip area; 203, second strip area; 204, reinforced protection area; 205, second reserved hollow area; 206, third reserved hollow area;
[0046] 21, first isolation glue point; 22, isolation glue line; 23, first glue line; 24, second glue line; 221, second isolation glue point. DETAILED DESCRIPTION
[0047] In order to make the technical problems solved by the present application, the technical scheme adopted and the technical effects achieved more clear, the technical scheme of the embodiments of the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.
[0048] In the description of the present application, it should be pointed out that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.
[0049] In the description of the utility model, it is necessary to explain that, unless another explicit provision and limitation, the term "installation", "connection", "connect" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, can be mechanical connection, also can be electrical connection, can be direct connection, also can be indirectly connected through the intermediate medium, can be the intercommunication of two elements.
[0050] As Figures 1 to 5 Indicated, the embodiment of the application provides a kind of solar cell, can avoid the front surface of solar cell in production process abrasion, scratch, while not affect the film color sorting detection of solar cell.The solar cell includes cell body 1 and isolation structure 2.
[0051] Wherein, refer to Figure 1 、 Figure 2 And Figure 4 , cell body 1 has front surface and back surface, and front surface is light receiving surface.Isolation structure 2 is arranged on the front surface of cell body 1, and isolation structure 2 has first reserved hollow area 201, and the area of single first reserved hollow area 201 is greater than or equal to 0.49cm 2 After isolation structure 2 is arranged on cell body 1, first reserved hollow area 201 exposes a region on the front surface of cell body 1, and the region is used for detection equipment to detect the front surface of solar cell.
[0052] By setting isolation structure 2 on the front surface of cell body 1, the front surface and back surface between upper and lower solar cell can be separated by isolation structure 2 when solar cell is stacked and stored later, to prevent the grid line structure on the back surface of upper solar cell from scratching the front surface of lower solar cell, to ensure the yield of cell product.At the same time, in the production and circulation process of solar cell, isolation structure 2 can separate the front surface of cell body 1 from the conveying belt conveying solar cell, to prevent the conveying belt from abrading the front surface of cell body 1, to improve the yield of cell product.
[0053] By setting first reserved hollow area 201 on isolation structure 2, and the area of first reserved hollow area 201 is greater than or equal to 0.49cm 2So that the front surface of the solar cell body 1 can reserve a large enough area for the detection equipment to detect after the isolation structure 2 is arranged. When the detection equipment is used to detect the solar cell (such as film color detection, surface defect detection, etc.), the detection equipment can accurately identify the front surface of the solar cell body 1 through the first reserved hollow area 201, without affecting the detection process of the solar cell. Therefore, the isolation structure 2 can be arranged on the front surface of the solar cell body 1 before the detection process, preventing the front surface of the solar cell from being worn or scratched during the detection process, ensuring that the solar cell product can be effectively protected throughout the production process, and further improving the quality of the cell string and the photovoltaic module.
[0054] Optionally, the front surface of the solar cell is provided with an anti-reflection film layer, and the isolation structure 2 is arranged on the anti-reflection film layer. That is, the isolation structure 2 can be arranged after the front surface of the solar cell is coated with a film. The isolation structure 2 can protect the front surface of the solar cell body 1 during film color detection and prevent the anti-reflection film layer from being damaged. At the same time, since the isolation structure 2 has the first reserved hollow area 201, the anti-reflection film layer can be exposed through the first reserved hollow area 201. During film color detection, the detection equipment can identify the anti-reflection film layer through the first reserved hollow area 201, ensuring the accuracy of the film color detection result.
[0055] Optionally, the material of the isolation structure 2 includes isolation glue, which can provide good isolation and support, and has an insulating effect, which can effectively prevent electrical short circuit inside or on the surface of the solar cell. In other embodiments, other materials can be selected as needed to form the isolation structure 2, which is not limited to isolation glue. For example, the isolation structure 2 can also be made of polyvinyl alcohol (PVA), ethylene-vinyl acetate copolymer (EVA), polyolefin elastomer (POE), EPE (EVA / POE composite film), polyvinyl butyral (PVB), polyurethane (PU), polydimethylsiloxane, PDMS, etc.
[0056] Optionally, the material of the isolation structure 2 can be the same as the adhesive layer of the photovoltaic module, so that the isolation structure 2 can be bonded with the glass plate of the photovoltaic module when the photovoltaic module is laminated later, without the need to separately clean and remove the isolation structure 2, simplifying the production process of the solar cell and reducing production costs.
[0057] Optionally, the melting point of the material of the isolation structure 2 can be 40-90°C, so as to avoid the isolation structure 2 from melting due to too low melting point in summer with high temperature, and avoid the isolation structure 2 from failing to melt during lamination due to too high melting point.
[0058] Optionally, the melt flow rate of the material of the isolation structure 2 is greater than or equal to 25, so as to ensure the flowability and the physical combination ability with the glass plate and the back plate. The cross-linking degree of the isolation structure 2 after encapsulation is greater than or equal to 80% (for example, the cross-linking degree of the EVA adhesive film can reach 95%-98%), so as to guarantee the long-term mechanical strength.
[0059] Optionally, the resistivity of the isolation structure 2 is greater than 1*1014Ω·cm, so as to avoid the potential induced degradation (PID) failure of the photovoltaic module due to too low resistivity. The transmittance of the isolation structure 2 after lamination is greater than 91% (in the wavelength range of 380-1100 nm), so as to avoid the influence of the isolation structure 2 after lamination on the optical absorption of the photovoltaic module. The water vapor transmission rate (WVTR) of the isolation structure 2 is less than 5g / (m 2 ·day), which can also inhibit the PID failure.
[0060] Optionally, the area of the first reserved hollow area 201 is greater than the recognition area of the detection equipment, so as to ensure that the recognition area of the detection equipment is always located within the first reserved hollow area 201. Since there is isolation adhesive outside the first reserved hollow area 201, and the isolation adhesive has strong reflection to the light source, the first reserved hollow area 201 is designed to be one circle larger than the recognition area of the detection equipment, so that the recognition area of the detection equipment is completely located within the first reserved hollow area 201, avoiding the influence of the reflected light of the isolation adhesive on the detection equipment, and further ensuring the accuracy of the detection result.
[0061] Illustratively, the detection equipment can be an AOI detection equipment, which detects the area of the cell body 1 exposed through the first reserved hollow area 201 by image recognition, and color recognition can be performed.
[0062] Optionally, referring to Figure 1 , Figure 2 and Figure 4 , the isolation structure 2 has a plurality of first reserved hollow areas 201, and the front surface of the cell body 1 forms an area for detection of the detection equipment at a position corresponding to each first reserved hollow area 201. The detection equipment recognizes the front surface of the cell body 1 through the plurality of first reserved hollow areas 201, which can reduce the detection error and improve the reliability of the detection result.
[0063] In some embodiments, as shown in 1, after the isolation structure 2 is provided on the front side of the battery cell body 1, six first reserved hollow areas 201 are reserved. Specifically, three first reserved hollow areas 201 are provided in the upper half area and the lower half area of the battery cell body 1.
[0064] In some embodiments, such as Figure 2 As shown, four first reserved hollow areas 201 are reserved on the front of the battery cell body 1, and two first reserved hollow areas 201 are provided at intervals in both the upper and lower halves of the battery cell body 1.
[0065] The number and distribution of the first reserved hollow area 201 can be adaptively adjusted according to the number and distribution of areas that the detection equipment needs to identify, and are not limited to the number and distribution listed above.
[0066] Optionally, the total area of the front side of the solar cell body 1 is S1, and the total area of all the first reserved hollow areas 201 is S2, wherein S2 / S1 is greater than or equal to 20%. This setting ensures that the reserved area for detection on the solar cell body 1 is large enough, reduces the impact of the reflective light from the separator on the accuracy of film color detection, and avoids the separation of the separator area from affecting the detection of film defects (such as microcracks, dirt, etc.) on the front side of the solar cell body 1.
[0067] Optionally, see Figure 2 and Figure 4 The isolation structure 2 has a second reserved hollow area 205, which exposes the cutting area 12 on the front side of the solar cell body 1. The cutting area 12 is configured to allow a cutting tool to cut the solar cell. That is, when the solar cell is slicing, the cutting tool cuts from the cutting area 12. The reserved cutting area 12 can prevent the cutting tool from sticking to the isolation adhesive and protect the cutting tool.
[0068] Optionally, the center line of the cutting region 12 is the horizontal axis of symmetry of the battery cell body 1 (refer to...). Figure 2 (The orientation in the middle). For example, the width of the cutting area 12 is 1mm to 10mm, leaving enough cutting space for the cutting tool. For example, the width of the cutting area 12 can be 1mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or a range of values between any two of the above, but is not limited to the values and ranges listed above.
[0069] The cutting tool can be a laser cutting machine. By reserving the cutting area 12, the isolation adhesive can be prevented from melting and sticking together during the sectional laser cutting, thereby avoiding damage to the laser cutting machine.
[0070] See Figure 1 andFigure 2 The isolation structure 2 has a third reserved hollow area 206, which is directly opposite to the area where the PAD points (electrode contact points) are located on the cell body 1. That is, no insulating adhesive is provided on the front side of the cell body 1 in the area corresponding to the PAD points on the back side of the cell body 1, so as to avoid the insulating adhesive affecting the electrical connection function of the PAD points and to avoid affecting the current collection efficiency of the solar cell.
[0071] The following refers to Examples 1 to 3, and in conjunction with... Figures 1 to 5 Three types of solar cells will be introduced separately.
[0072] Example 1
[0073] like Figure 1 As shown, this embodiment provides a solar cell, wherein the material of the isolation structure 2 includes an insulating adhesive. The isolation structure 2 includes multiple rows of first insulating adhesive dots 21 spaced apart along a first direction, and multiple first insulating adhesive dots 21 in the same row are spaced apart along a second direction, with the first direction and the second direction forming an angle. That is, first insulating adhesive dots 21 are arranged on the front side of the solar cell body 1, except for the area used for detection (the area corresponding to the first reserved hollow area 201), the cutting area 12, and the PAD point area, so that the front side of the solar cell body 1 can be effectively protected. In addition, by applying adhesive at intervals on the solar cell body 1 to form spaced first insulating adhesive dots 21, the amount of insulating adhesive used can be saved, reducing the production cost of the solar cell.
[0074] In this embodiment, the first direction is the length direction of the battery cell body 1. Figure 1 The vertical direction is the first direction, and the second direction is the width direction of the battery cell body 1. Figure 1 The horizontal direction. In other embodiments, the first and second directions may also be directions inclined relative to the horizontal and vertical directions.
[0075] In some implementation schemes, multiple first adhesive dots 21 in the same row are arranged flush in the second direction. This arrangement allows multiple rows of adhesive dots to be distributed more evenly on the front side of the solar cell body 1. When the solar cells are stacked, the solar cell body 1 is subjected to uniform force, reducing the warping and microcracks of the solar cell body 1 caused by the pressure of the adhesive.
[0076] In some implementations, multiple first insulating adhesive dots 21 in the same row are staggered in the second direction. The staggered arrangement of the first insulating adhesive dots 21 can compensate for the gaps between adjacent rows of first insulating adhesive dots 21 in the first direction, making the first insulating adhesive dots 21 more evenly distributed on the front side of the solar cell body 1, reducing stress concentration caused by the first insulating adhesive dots 21, improving the uniformity of stress on the solar cell body 1, and reducing the probability of warping and microcracks in the solar cell.
[0077] In this embodiment, as shown in Figure 1 The reinforcing protection area 204 is arranged in the isolation structure 2, and the first isolation glue points 21 in the same row in the reinforcing protection area 204 are staggered arranged in the second direction. The first isolation glue points 21 in the same row in other areas (excluding the first reserved hollow area 201, the second reserved hollow area 205, and the third reserved hollow area 206) of the isolation structure 2 are flush arranged in the second direction. The distance between the reinforcing protection area 204 and the outer edge of the battery piece body 1 is W1, and the value range of W1 is 5mm≤W1≤50mm. The width of the reinforcing protection area 204 is W2, and the value range of W2 is 40mm≤W2≤50mm. The reinforcing protection area 204 is arranged in the above manner, and after the isolation structure 2 is arranged on the battery piece body 1, the reinforcing protection area 204 can be directly opposite to the conveying belt conveying the solar cell piece.
[0078] Therefore, the first isolation glue points 21 in the same row in the reinforcing protection area 204 are designed to be staggered arranged in the second direction, so that the first isolation glue points 21 in the reinforcing protection area 204 have no gap in the horizontal direction, which can improve the protection capability of the front surface of the battery piece body 1 and reduce the wear and scratch of the conveying belt on the battery piece body 1.
[0079] Exemplarily, W1 can be 25mm. In other embodiments, W1 can also be 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, etc., but is not limited to the above listed values and value ranges, and can be adaptively adjusted according to the size of the conveying belt, the overall size change of the solar cell piece, and other factors.
[0080] Exemplarily, W2 can be 45mm. In other embodiments, W2 can also be 40mm, 41mm, 42mm, 43mm, 44mm, 46mm, 47mm, 48mm, 49mm, 50mm, etc., but is not limited to the above listed values and value ranges, and can be adaptively adjusted according to the size of the conveying belt, the overall size change of the solar cell piece, and other factors.
[0081] Optionally, the extension direction of the reinforcing protection area 204 is consistent with the advancing direction of the conveying belt, for example, referring to Figure 1 The extension direction of the reinforcing protection area 204 is the width direction of the battery piece body 1, and when the solar cell piece is placed on the conveying belt, the width direction is consistent with the advancing direction of the conveying belt.
[0082] In other embodiments, if the solar cell is placed with its length direction consistent with the direction of the conveying belt, the reinforced protection area 204 can be designed to extend along the length direction of the cell body 1. That is, the extension direction of the reinforced protection area 204 is designed according to the placement orientation of the solar cell when it is actually transferred, and the extension direction of the reinforced protection area 204 is not specially limited here.
[0083] Optionally, the total length of the projections of the plurality of rows of first isolation glue points 21 in the first direction within the reinforced protection area 204 is greater than or equal to the length of the reinforced protection area 204 in the first direction. Specifically, the total length of the projections of the two first isolation glue points 21 arranged vertically in the first direction is greater than or equal to the width W2 of the reinforced protection area 204, so that there is no gap between the two adjacent rows of first isolation glue points 21, that is, there is no gap between the first isolation glue points 21 in the horizontal direction within the reinforced protection area 204, which can improve the protection capability of the front surface of the cell body 1 and reduce the wear and scratch of the conveying belt on the cell body 1. Figure 1
[0084] Optionally, the shape of the first isolation glue point 21 is rectangular, which can simplify the glue coating process and is easy to control and operate. In other embodiments, the shape of the first isolation glue point 21 can also be circular, oval, triangular, and other polygons, as long as it can protect the front surface of the cell body 1, and the shape of the first isolation glue point 21 is not specially limited here.
[0085] For example, the size of the rectangular first isolation glue point 21 is 1mm*5mm, which can ensure that the first isolation glue point 21 has sufficient support area, so that the isolation structure 2 can provide good isolation support, and waste of isolation glue material can be avoided.
[0086] Optionally, as shown in FIG. 1, the first reserved hollow area 201 of the isolation structure 2 is square, and the sizes of the six first reserved hollow areas 201 are consistent. For example, the size of the square first reserved hollow area 201 is 3cm*3cm, which is larger than the size 2.5*2.5cm of the identification area of the detection equipment.
[0087] Of course, the size of the first reserved hollow area 201 can be adaptively adjusted according to the size of the identification area of the detection equipment and the overall size of the solar cell.
[0088] Embodiment Two
[0089] For example, Figure 2 and Figure 3 As shown, the embodiment provides a solar cell, wherein the material of the isolation structure 2 comprises isolation glue. The isolation structure 2 comprises a plurality of first glue lines 23 and a plurality of second glue lines 24, the plurality of first glue lines 23 are arranged at intervals along a third direction, the plurality of second glue lines 24 are arranged at intervals along a fourth direction, and the first glue lines 23 and the second glue lines 24 are cross-connected, and the third direction and the fourth direction form an angle. That is, the isolation structure 2 is in a grid structure, and the grid structure is hollow designed at the area corresponding to the area for detection, the cutting area 12, and the area of the PAD point of the cell body 1, forming a first reserved hollow area 201, a second reserved hollow area 205, and a third reserved hollow area 206. The design of the grid structure for the isolation structure 2 can make the isolation glue more uniformly distributed on the front surface of the cell body 1, and ensure that the front surface of the cell body 1 can be effectively protected. At the same time, the grid-shaped isolation structure 2 can also reduce the amount of isolation glue and reduce the production cost of the product.
[0090] In the embodiment, the third direction is the length direction of the cell body 1, Figure 2 the vertical direction, and the fourth direction is the width direction of the cell body 1, Figure 2 the horizontal direction. In other embodiments, the third direction and the fourth direction can also be directions inclined relative to the horizontal direction and the vertical direction.
[0091] Optionally, the width of the first glue line 23 is 20-300 μm. The width of the second glue line 24 is 20-300 μm. The first glue line 23 and the second glue line 24 in the size range can reduce the amount of isolation glue while ensuring the isolation and support effect of the isolation structure 2, and are suitable for the requirements of the existing printing or electroplating process and easy to implement.
[0092] For example, the width of the first glue line 23 can be 30 μm, 40 μm, 50 μm, 80 μm, 100 μm, 150 μm, 200 μm, or a value range between any two of the above values, but is not limited to the above values and value ranges.
[0093] The width of the second glue line 24 can be 30 μm, 50 μm, 70 μm, 90 μm, 110 μm, 130 μm, 150 μm, 200 μm, 260 μm, or a value range between any two of the above values, but is not limited to the above values and value ranges.
[0094] Optionally, the distance between adjacent two first glue lines 23 is 1-5 mm. The distance between adjacent two second glue lines 24 is 1-5 mm. The size range can ensure the isolation and support effect of the isolation structure 2, while reducing the amount of isolation glue and saving cost.
[0095] Exemplarily, the interval between two adjacent first glue lines 23 can be 1mm, 2mm, 3mm, 4mm, 5mm, or a value range between any two of the above values.
[0096] The interval between two adjacent second glue lines 24 can be 1mm, 2mm, 3mm, 4mm, 5mm, or a value range between any two of the above values.
[0097] Optionally, as shown in 2, the first reserved hollow area 201 of the isolation structure 2 is a square, and the four first reserved hollow areas 201 are of the same size. Exemplarily, the size of the square first reserved hollow area 201 is 3cm*3cm, which is larger than the size of the identification area of the detection equipment 2.5*2.5cm.
[0098] Of course, the size of the first reserved hollow area 201 can be adaptively adjusted according to the size of the identification area of the detection equipment and the overall size of the solar cell piece.
[0099] Embodiment Three
[0100] As shown in Figure 4 and Figure 5 , the embodiment provides a solar cell piece, wherein the material of the isolation structure 2 comprises isolation glue. The isolation structure 2 has a first strip-shaped area 202 with the diagonal line of the cell piece body 1 as the center line, and a second strip-shaped area 203 with the symmetry axis of the cell piece body 1 as the center line, at least one isolation glue line 22 extending along the diagonal direction is arranged in the first strip-shaped area 202, at least one isolation glue line 22 extending along the symmetry axis direction is arranged in the second strip-shaped area 203, and the first strip-shaped area 202 and the second strip-shaped area 203 form a first reserved hollow area 201 therebetween.
[0101] Since the first strip-shaped area 202 is the diagonal line area of the cell piece body 1, and the second strip-shaped area 203 is the symmetry axis area of the cell piece body 1, arranging the isolation glue lines 22 in the above two areas can make the stress of the cell piece body 1 more balanced, reduce the stress concentration phenomenon caused by spraying isolation glue, and reduce the possibility of solar cell piece fragmentation.
[0102] In the above technical solution, the area of the front surface of the cell piece body 1 without the isolation glue line 22 can be used as the area for detection by the detection equipment, and the detection process (such as film color detection, surface defect detection, etc.) of the solar cell piece can be completed.
[0103] In some embodiments, as shown in Figure 4As shown, two isolation glue lines 22 are arranged in the second strip-shaped area 203 corresponding to the horizontal symmetry axis, and the second reserved hollow area 205 is arranged between the two isolation glue lines 22, so as to reserve the cutting area 12 on the front surface of the solar cell body 1 and prepare for the cutting process of the solar cell. One isolation glue line 22 can be arranged in each of the first strip-shaped area 202 and the second strip-shaped area 203, so as to reduce the amount of isolation glue.
[0104] In some embodiments, as shown, one isolation glue line 22 can be arranged in each of the first strip-shaped area 202 and the second strip-shaped area 203. Figure 5
[0105] The number of isolation glue lines 22 can be adjusted adaptively according to actual conditions, and is not limited to the number listed above.
[0106] Referring to Figure 4 and Figure 5 The isolation structure 2 is provided with a reinforced protection area 204, and a plurality of isolation glue lines 22 are arranged in the reinforced protection area 204. The distance between the reinforced protection area 204 and the outer edge of the solar cell body 1 is W1, and the value of W1 is in the range of 5mm≤W1≤50mm. The width of the reinforced protection area 204 is W2, and the value of W2 is in the range of 40mm≤W2≤50mm. The reinforced protection area 204 is arranged in the above manner, and after the isolation structure 2 is arranged on the solar cell body 1, the reinforced protection area 204 can be directly opposite to the conveying belt conveying the solar cell, so as to locally reinforce the protection capability of the isolation structure 2, reduce the wear and scratch of the conveying belt on the solar cell body 1, and effectively protect the front surface of the solar cell body 1. Optionally, the isolation glue lines 22 in the reinforced protection area 204 extend along the conveying direction of the conveying belt, so as to improve the protection capability of the isolation structure 2.
[0107] Exemplarily, W1 can be 25mm. In other embodiments, W1 can also be 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, etc., but is not limited to the values and value ranges listed above, and can be adjusted adaptively according to the size of the conveying belt, the overall size change of the solar cell, and other factors.
[0108] Exemplarily, W2 can be 45mm. In other embodiments, W2 can also be 40mm, 41mm, 42mm, 43mm, 44mm, 46mm, 47mm, 48mm, 49mm, 50mm, etc., but is not limited to the values and value ranges listed above, and can be adjusted adaptively according to the size of the conveying belt, the overall size change of the solar cell, and other factors.
[0109] Optionally, referring toFigure 5 The extending direction of the reinforced protection area 204 is the length direction of the solar cell body 1. When the solar cell is placed on the conveying belt, the length direction is consistent with the advancing direction of the conveying belt. In other embodiments, if the solar cell needs to be placed with its width direction consistent with the advancing direction of the conveying belt, the reinforced protection area 204 can be designed to extend along the width direction of the solar cell body 1.
[0110] Optionally, the proportion of the number of the first isolation glue lines 22 in the first strip-shaped area 202 and the proportion of the number of the first isolation glue lines 22 in the second strip-shaped area 203 are both less than the proportion of the number of the first isolation glue lines 22 in the reinforced protection area 204. The proportion of the number of the first isolation glue lines 22 is the ratio of the number of the first isolation glue lines 22 to the area of the front surface of the solar cell body 1. For example, the proportion of the number of the first isolation glue lines 22 in the reinforced protection area 204 is equal to the total number of the first isolation glue lines 22 in the reinforced protection area 204 divided by the area of the front surface of the solar cell body 1. The proportion of the number of the first isolation glue lines 22 in the first strip-shaped area 202 is equal to the total number of the first isolation glue lines 22 in the first strip-shaped area 202 divided by the area of the front surface of the solar cell body 1. The proportion of the number of the first isolation glue lines 22 in the second strip-shaped area 203 is equal to the total number of the first isolation glue lines 22 in the second strip-shaped area 203 divided by the area of the front surface of the solar cell body 1.
[0111] That is, in the present embodiment, the distribution density of the isolation glue lines 22 in the reinforced protection area 204 is greater than the distribution density of the isolation glue lines 22 in the first strip-shaped area 202 and the second strip-shaped area 203, which ensures that the isolation structure 2 can effectively protect the position of the solar cell body 1 facing the conveying belt.
[0112] Further, in the overlapping parts of the first strip-shaped area 202, the second strip-shaped area 203 and the reinforced protection area 204, the isolation glue lines 22 do not overlap, which can further reduce the stress concentration phenomenon.
[0113] Optionally, referring to Figure 4 and Figure 5 , the isolation glue line 22 comprises a plurality of second isolation glue points 221 arranged at intervals along the extending direction thereof. That is, the isolation glue line 22 is in the form of a broken line, which can reduce the amount of isolation glue while ensuring the isolation and support effect of the isolation structure 2. In other embodiments, the isolation glue line 22 can also be designed in the form of a continuous solid line.
[0114] Optionally, the shape of the second isolation glue point 221 is rectangular, which is simple in the gluing process and easy to implement. In other embodiments, the shape of the second isolation glue point 221 can also be circular, elliptical, triangular or other polygonal shapes, which are not specially limited here.
[0115] Exemplarily, the size of the rectangular second isolation glue dot 221 is 1mm*5mm, which can ensure that the isolation glue line 22 has sufficient supporting area, so that the isolation structure 2 can provide good isolation support and can avoid waste of isolation glue material.
[0116] The embodiment of the present application also provides a battery string, which comprises the split piece cut from the solar cell piece according to any one of the above embodiments. After the split piece is cut from the solar cell piece by the cutting tool, the split pieces can be connected in series or in parallel to form the battery string.
[0117] The embodiment of the present application also provides a battery string, which comprises the solar cell piece according to any one of the above embodiments. The battery string can comprise a plurality of solar cell pieces, and the plurality of solar cell pieces can be connected in series or in parallel (for example, connected by a solder strip), so as to improve the output voltage.
[0118] The embodiment of the present application also provides a photovoltaic module, which comprises the battery string according to the above embodiment. The photovoltaic module can comprise a plurality of battery strings, and the plurality of battery strings can be connected in series or in parallel.
[0119] In some embodiments, the photovoltaic module further comprises a glass plate, a back plate, a frame and the like, the battery string is arranged between the glass plate and the back plate, the battery string and the glass plate are bonded by a first glue layer, the battery string and the back plate are bonded by a second glue layer, and the frame is used to fix the glass plate, the back plate and the battery string inside to form a complete power generation unit.
[0120] It should be noted that the above only describes the preferred embodiments of the present application and the technical principles applied in the present application. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the appended claims.
Claims
1. A solar cell, characterized by, The battery piece body (1) has a front surface and a back surface, and the front surface is a light receiving surface. The isolation structure (2) has a plurality of first reserved hollow areas (201), and the total area of the front surface of the battery piece body (1) is S1, and the total area of all the first reserved hollow areas (201) is S2, wherein S2 / S1 is greater than or equal to 20%. Isolation structure (2) is arranged on the front surface of the battery piece body (1), the isolation structure (2) has first reserved hollow area (201), the area of single first reserved hollow area (201) is greater than or equal to 0.49cm 2 .
2. The solar cell according to claim 1, wherein The isolation structure (2) includes a plurality of rows of first isolation glue points (21) arranged at intervals in a first direction, and a plurality of first isolation glue points (21) in the same row are distributed at intervals in a second direction, and the first direction and the second direction form an angle.
3. The solar cell of claim 1, wherein, The plurality of first isolation glue points (21) in the same row are arranged in the second direction.
4. The solar cell of claim 3, wherein, Alternatively, the plurality of first isolation glue points (21) in the same row are arranged in the second direction. The isolation structure (2) is provided with a reinforced protection area (204), and the plurality of first isolation glue points (21) in the same row in the reinforced protection area (204) are arranged in the second direction.
5. The solar cell of claim 3, wherein, The distance between the reinforced protection area (204) and the outer edge of the battery piece body (1) is W1, and the value range of W1 is 5mm≤W1≤50mm; the width of the reinforced protection area (204) is W2, and the value range of W2 is 40mm≤W2≤50mm. The projection total length of the plurality of rows of first isolation glue points (21) in the reinforced protection area (204) in the first direction is greater than or equal to the width of the reinforced protection area (204) in the first direction.
6. The solar cell of claim 5, wherein, The isolation structure (2) has a first strip-shaped area (202) with a diagonal of the battery piece body (1) as a center line, and a second strip-shaped area (203) with a symmetry axis of the battery piece body (1) as a center line, at least one isolation glue line (22) extending along the diagonal direction is arranged in the first strip-shaped area (202), and at least one isolation glue line (22) extending along the symmetry axis direction is arranged in the second strip-shaped area (203), and the first strip-shaped area (202) and the second strip-shaped area (203) form the first reserved hollow area (201).
7. The solar cell of claim 1, wherein, The isolation structure (2) is provided with a reinforced protection area (204), and a plurality of isolation glue lines (22) are arranged at intervals in the reinforced protection area (204).
8. The solar cell of claim 7, wherein, The distance between the reinforced protection area (204) and the outer edge of the battery piece body (1) is W1, and the value range of W1 is 5mm≤W1≤50mm; the width of the reinforced protection area (204) is W2, and the value range of W2 is 40mm≤W2≤50mm. The number ratio of the first isolation glue lines (22) in the first strip-shaped area (202) and the number ratio of the first isolation glue lines (22) in the second strip-shaped area (203) are both less than the number ratio of the first isolation glue lines (22) in the reinforced protection area (204).
9. The solar cell of claim 8, wherein, 10. The solar cell of claim 8, wherein, The isolation glue line (22) comprises a plurality of second isolation glue points (221) arranged at intervals along the extension direction thereof.
11. The solar cell of claim 1, wherein, The isolation structure (2) comprises a plurality of first glue lines (23) and a plurality of second glue lines (24), the plurality of first glue lines (23) are arranged at intervals along a third direction, the plurality of second glue lines (24) are arranged at intervals along a fourth direction, the first glue lines (23) and the second glue lines (24) are cross-connected, and the third direction and the fourth direction form an angle.
12. The solar cell of claim 11, wherein, The width of the first glue line (23) is 20 μm-300 μm. And / or, the width of the second glue line (24) is 20 μm-300 μm.
13. The solar cell of claim 11, wherein, The distance between two adjacent first glue lines (23) is 1 mm-5 mm. And / or, the distance between two adjacent second glue lines (24) is 1 mm-5 mm.
14. The solar cell of any of claims 1-13, wherein, The isolation structure (2) has a third reserved hollow area (206) opposite to the area where the PAD point on the battery piece body (1) is located.
15. The solar cell as claimed in any one of claims 1-13, characterized in that, The isolation structure (2) has a second reserved hollow area (205) in the front exposed cutting area (12), and the cutting area (12) is configured to allow a cutting tool to cut the solar battery piece.
16. A string of batteries, characterized by The solar battery piece obtained by cutting the solar battery piece of claim 15.
17. A battery string, characterized by The solar battery piece of any one of claims 1-14.
18. A photovoltaic module, characterized by, The battery string of claim 16 or 17. The battery string of claim 16 or 17.