A negative pitch photovoltaic module

Abstract

The utility model discloses a kind of negative interval photovoltaic modules, including multiple cell pieces by welding band series connection, there is overlap area between two adjacent cell pieces, buffer piece is set on each welding band, buffer piece is located in overlap area, and it is wrapped on the outer periphery of welding band in circumferential direction, the cross-sectional shape of welding band is rectangle, and rounded corner is set in four corners.The utility model reduces the stress generated by mutual extrusion between welding band and cell piece in cell module laminating process by the buffering effect of buffer piece, so as to reduce the probability of hidden crack of cell piece, improve the yield of photovoltaic module.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic module technology, and in particular relates to a negative-pitch photovoltaic module. Background Technology

[0002] Negative-pitch photovoltaic modules are a new type of photovoltaic module that improves the power and efficiency of the module by optimizing the arrangement of solar cells and reducing or even eliminating the spacing between the cells.

[0003] In negative-pitch photovoltaic modules, the front end of the next cell overlaps and presses against the edge of the previous cell, and the solder ribbon passes through the overlapping area. During the lamination process of the cell module, the solder ribbon and the cell are squeezed against each other. Since crystalline silicon cells are brittle materials, the local compression between the solder ribbon and the cell will generate stress far exceeding its flexural strength, causing microcracks in the cell.

[0004] Therefore, it is necessary to improve the negative-pitch photovoltaic modules in the existing technology. Utility Model Content

[0005] The purpose of this invention is to overcome the defects in the existing technology and provide a negative-pitch photovoltaic module that reduces the probability of microcracks in the solar cells.

[0006] To achieve the above objectives, the specific technical solution of the negative-pitch photovoltaic module of this utility model is as follows: A negative-pitch photovoltaic module includes multiple solar cells connected in series by solder strips, with an overlap area between adjacent solar cells. Each solder strip is provided with a buffer element located in the overlap area and circumferentially wrapped around the outer periphery of the solder strip. The cross-sectional shape of the solder strip is rectangular, and each of its four corners is rounded.

[0007] Preferably, in order to reduce the pressure exerted by the buffer on the battery cell and reduce the probability of microcracks in the battery cell, the buffer has a flat structure and its length along the extension direction of the solder strip is greater than the width of the overlapping area.

[0008] Preferably, in order to reduce stress concentration between the buffer and the battery cell, the thickness of the buffer at both ends is less than the thickness of the middle section along the thickness direction of the battery cell.

[0009] Preferably, in order to reduce the pressure exerted by the solder ribbon on the battery cell and further reduce the probability of microcracks in the battery cell, the solder ribbon located in the overlapping area is S-shaped and its plane is parallel to the plane of the battery cell.

[0010] Preferably, in order to disperse the stress at the edge of the battery cell and reduce the probability of microcracks in the battery cell, the side of the battery cell located in the overlapping area is provided with a chamfer.

[0011] Preferably, in order to improve the buffering effect on the battery cells, each of the buffer members is connected to each other through an extension to form a buffer strip covering the overlapping area.

[0012] Preferably, in order to improve the connection strength between the buffer strip and the adhesive film during subsequent lamination, the surface of the extension is provided with a groove.

[0013] Preferably, in order to position the battery cell and reduce the probability of it shifting during the lamination process, the end of the buffer strip is provided with an L-shaped protrusion that wraps around the corner edge of the battery cell.

[0014] The negative-pitch photovoltaic module of this invention has the following advantages: through the buffering effect of the buffer component, the stress generated by the mutual compression between the solder ribbon and the cell during the lamination process of the battery module is reduced, thereby reducing the probability of microcracks in the cell and improving the yield of the photovoltaic module. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the photovoltaic module of this utility model; Figure 2 This is an exploded view of the photovoltaic module of this utility model; Figure 3 for Figure 2 Enlarged view of part A; Figure 4 This is a schematic diagram of the structure of the welding strip of this utility model; Figure 5 This is a schematic diagram of the installation structure of the buffer strip of this utility model; Figure 6 for Figure 5 Enlarged view of part B; The markings in the diagram are as follows: 1. Battery cell; 2. Overlapping area; 3. Welding strip; 4. Buffer strip; 41. Buffer component; 42. Extension; 43. Protrusion; 421. Groove. Detailed Implementation

[0016] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0017] The terms "top surface," "bottom surface," and "full surface" are used with reference to the normal operating state of negative-pitch photovoltaic modules and are only for the convenience of describing this utility model and simplifying the description. They are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0018] like Figure 1-3As shown, a negative-pitch photovoltaic module includes multiple solar cells 1 connected in series by solder strips 3. There is an overlap area 2 between two adjacent solar cells 1. Each solder strip 3 is provided with a buffer 41. The buffer 41 is located in the overlap area 2 and wraps around the outer periphery of the solder strip 3. The cross-sectional shape of the solder strip 3 is rectangular and rounded at all four corners.

[0019] In the aforementioned negative-pitch photovoltaic module, a buffer 41 is provided in the overlapping area 2 of two adjacent cells 1. The buffer 41 is made of silicone foam. During the lamination process, the elastic deformation of the buffer 41 disperses stress and absorbs impact energy, thereby reducing the stress caused by local compression on the cell 1, ultimately reducing the probability of microcracks in the cell and improving the yield of the negative-pitch photovoltaic module. The buffer 41 is directly fixedly connected to the solder ribbon 3, which can realize the mutual limiting effect between the buffer 41 and the solder ribbon 3, preventing the solder ribbon 3 or the buffer 41 from shifting position during the lamination process, so as to ensure the accuracy of the buffer 41's setting position and ensure the final buffering effect. Compared with the circular cross-section solder ribbon 3, the rectangular cross-section solder ribbon 3 has a larger contact area with the cell 1, and the rounded corners can eliminate the sharp parts on the solder ribbon 2, thereby reducing the pressure of the solder ribbon 3 on the cell 1 during the lamination process, further reducing the probability of microcracks in the cell 1.

[0020] Further improvements include, for example Figure 3 As shown, the buffer 41 has a flat structure, and its length along the extension direction of the solder strip 3 is greater than the width of the overlapping area 2. The flat structure of the buffer 41 has a larger area and a flat surface that contacts the battery cell 1, which not only improves the stability of the connection between the buffer 41 and the battery cell 1 and prevents the buffer 41 from shifting during lamination, but also reduces the pressure exerted by the buffer 41 on the battery cell 1, reducing the probability of microcracks in the battery cell 1. The length of the buffer 41 is greater than the width of the overlapping area 2, so that the buffer 41 can provide some support for the weak edge of the battery cell 1 from the inside, preventing microcracks from occurring at the edge of the battery cell 1 due to large compressive forces.

[0021] Further improvements include, for example Figure 3 As shown, along the thickness direction of the battery cell 1, the thickness at both ends of the buffer member 41 is less than the thickness in the middle section. Specifically, the thickness at both ends of the buffer member 41 gradually decreases, making the buffer member 41 have an overall spindle-shaped structure. This makes the transition between the buffer member 41 and the battery cell 1 smoother, further reducing stress concentration at the contact points between the buffer member 41 and the battery cell 1, and reducing the risk of microcracks and breakage of the battery cell 1.

[0022] Further improvements include, for example Figure 4As shown, the solder ribbons 3 located in the overlap area 2 are distributed in an S-shape, and their plane is parallel to the plane of the battery cell 1. The S-shaped distribution of the solder ribbons 3 can increase the contact area between the solder ribbons 3 and the battery cell 1, further reducing the pressure exerted by the solder ribbons 3 on the battery cell 1 and reducing the risk of microcracks and breakage of the battery cell 1; in addition, the S-shaped solder ribbons 3, together with the elastic buffer 41 wrapped around their outer periphery, allow the solder ribbons 3 to stretch and contract to a certain extent in their own extension direction. During the lamination process, the elastic expansion and contraction of the solder ribbons 3 can reduce the stress concentration at the connection between the solder ribbons 3 and the battery cell 1, reducing the probability of damage at the connection between the battery cell 1 and the solder ribbons 3.

[0023] Further improvements include, for example Figure 6 As shown, the side of the solar cell 1 located in the overlap area 2 has a chamfer. The chamfer reduces stress concentration at the edge of the solar cell 1, thus reducing the risk of microcracks.

[0024] Further improvements include, for example Figure 5 and 6 As shown, each buffer element 41 is interconnected by an extension 42 to form a buffer strip 4 covering the overlapping area 2. The material of the extension 42 is the same as that of the buffer element 41, and the two are integrally formed. The buffer strip 4 thus obtained can provide a good buffering effect on the battery cell 1 in the entire overlapping area 2, further reducing the risk of microcracks in the battery cell.

[0025] Further improvements include, for example Figure 6 As shown, the surface of the extension 42 is provided with a groove 421. The groove 421 can make the connection between the adhesive film and the buffer strip 4 more secure after lamination, thereby eliminating the internal gaps of the photovoltaic module, effectively blocking the water vapor penetration channel, improving the sealing performance of the photovoltaic module; and can also ensure the integrity of the internal structure of the photovoltaic module, improving the impact resistance of the photovoltaic module.

[0026] Further improvements include, for example Figure 6 As shown, the end of the buffer strip 4 is provided with an L-shaped protrusion 43, which wraps around the corner edge of the solar cell 1. The protrusion 43 and the solar cell 1 form a mutual limiting structure, which can limit the relative position between the solar cell 1, the buffer strip 4 and the solder strip 3 during the lamination process, prevent the components from shifting, and improve the quality of the final photovoltaic module.

[0027] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are protected by this utility model.

Claims

1. A negative-pitch photovoltaic module, comprising a plurality of solar cells (1) connected in series via solder strips (3), characterized in that: There is an overlap area (2) between two adjacent battery cells (1), and each of the welding strips (3) is provided with a buffer (41). The buffer (41) is located in the overlap area (2) and is circumferentially wrapped around the outer periphery of the welding strip (3). The cross-sectional shape of the welding strip (3) is rectangular, and rounded corners are provided at all four corners.

2. The negative-pitch photovoltaic module according to claim 1, characterized in that, The buffer (41) has a flat structure and its length along the extension direction of the weld strip (3) is greater than the width of the overlapping area (2).

3. The negative-pitch photovoltaic module according to claim 2, characterized in that, Along the thickness direction of the battery cell (1), the thickness of the buffer (41) at both ends is less than the thickness of the middle section.

4. The negative-pitch photovoltaic module according to claim 1, characterized in that, The solder strips (3) located in the overlapping area (2) are distributed in an S-shape, and their plane is parallel to the plane of the battery cell (1).

5. The negative-pitch photovoltaic module according to claim 1, characterized in that, The battery cell (1) has a chamfer on the side of the overlapping area (2).

6. The negative-pitch photovoltaic module according to claim 1, characterized in that, Each of the buffer members (41) is connected to each other through an extension (42) to form a buffer strip (4) covering the overlapping area (2).

7. The negative-pitch photovoltaic module according to claim 6, characterized in that, The surface of the extension (42) is provided with a groove (421).

8. The negative-pitch photovoltaic module according to claim 6, characterized in that, The buffer strip (4) has an L-shaped protrusion (43) at its end, which wraps around the corner edge of the battery cell (1).

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