Photovoltaic module
By setting a buffer support structure between the solar cells and the busbars, the problem of microcracks on the side edges of the solar cells in shingled configurations is solved, thereby improving the stability and lifespan of photovoltaic modules.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TRINA SOLAR CO LTD
- Filing Date
- 2025-05-09
- Publication Date
- 2026-05-08
AI Technical Summary
In shingled solar cells, the side edge of the cell closest to the jumper busbar that contacts the busbar is prone to microcracks during the lamination process.
A buffer support structure is set between the battery cell and the busbar, including a first buffer support structure and a second buffer support structure, to form a gap to reduce compressive stress. The buffer support strip and buffer pad are used for support and buffering to avoid hard contact.
This effectively reduces the risk of microcracks on the contact edges between the solar cells and the busbars, and reduces the stress in the stacked portions of adjacent solar cells, thereby improving the stability and lifespan of the photovoltaic module.
Smart Images
Figure CN224218748U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of photovoltaic technology, and specifically provides a photovoltaic module. Background Technology
[0002] With the development of high-efficiency battery technologies (such as Tunnel Oxide Passivated Contact and Heterojunction with Intrinsic Thin-layer), the requirements for the power and efficiency of photovoltaic modules are becoming increasingly stringent, and multi-segmentation and shingled cell configurations are becoming the mainstream trend in the future.
[0003] To ensure a consistent voltage when using multi-cell solar panels, jumpers are often used in the circuit design. To maintain uniform photovoltaic module dimensions, jumpers are typically placed on the back of the cells, and in some cases on the front, extending along the shingled arrangement of the cells as jumper busbars. Due to the shingled arrangement of the cells, a certain angle is formed between the cells and the jumper busbars. At the end of the cell closest to the jumper busbar, the cell is flush with the busbar, and its side edge contacts the busbar. Therefore, this is a line contact between the cell and the busbar at the end closest to the jumper busbar. During lamination, significant stress (stress caused by the compression of the jumper busbar) will be generated at this side edge of the cell, which is prone to microcracks.
[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Utility Model Content
[0005] The present invention aims to solve the above-mentioned technical problem, namely, to solve the problem that the side edge of the shingled battery cell near the jumper busbar and in contact with the jumper busbar is prone to microcracks during the lamination process.
[0006] This utility model provides a photovoltaic module, which includes a battery string and a busbar located on one side of the battery string. The battery string includes multiple battery cells connected in series. The multiple battery cells are arranged along the length direction of the battery string, and each battery cell is also stacked with adjacent battery cells in a direction perpendicular to the battery cells. The busbar extends along the length direction of the battery string. A buffer support structure is provided between the battery cells and the busbar.
[0007] In the preferred embodiment of the photovoltaic module described above, the buffer support structure includes a first buffer support structure, which is disposed between the surface of the solar cell facing the busbar and the busbar.
[0008] In the preferred embodiment of the photovoltaic module described above, the first buffer support structure is configured such that the side edge of the solar cell that is parallel to the busbar and has the smallest distance from it maintains a certain gap with the busbar.
[0009] In the preferred embodiment of the photovoltaic module described above, the first buffer support structure includes a first buffer support block, the solar cell includes a first end away from the busbar and a second end close to the busbar, and the first buffer support block is located close to the first end.
[0010] In the preferred embodiment of the photovoltaic module described above, the first buffer support structure further includes a second buffer support block, which is located in the region of the first buffer support block near the second end.
[0011] In the preferred embodiment of the photovoltaic module described above, there are multiple second buffer support blocks, and the first buffer support blocks and the multiple second buffer support blocks are evenly distributed along the length direction of the battery string.
[0012] In the preferred embodiment of the photovoltaic module described above, the first buffer support structure includes a buffer support strip that extends along the length of the battery string and spans the non-stacked portion of a single battery cell.
[0013] In the preferred embodiment of the photovoltaic module described above, the buffer support structure includes a second buffer support structure, which is disposed between the side edge of the solar cell that is parallel to the busbar and has the smallest distance from it and the busbar.
[0014] In the preferred embodiment of the photovoltaic module described above, the second buffer support structure includes a buffer pad (7), which has a first support surface (71), a second support surface (72), and a third support surface (73). The first support surface (71) and the second support surface (72) are connected to each other. The connection area of the first support surface (71) and the second support surface (72) supports the side edge (13). The first support surface (71) and the second support surface (72) respectively support the two surfaces of the battery cell that form the side edge (13). The third support surface (73) supports the busbar.
[0015] In the preferred embodiment of the photovoltaic module described above, the buffer pad (7) further has a fourth support surface (74), which supports the adjacent cell surface facing the busbar.
[0016] In the preferred embodiment of the photovoltaic module described above, the buffer pad has a first part (751) and a second part (752) between the area of the third support surface (73) facing the fourth support surface (74) and the fourth support surface (74). The first part (751) and the second part (752) are distributed sequentially along the direction from the fourth support surface (74) toward the third support surface (73). The elastic modulus of the first part (751) is smaller than that of the second part (752).
[0017] In the preferred embodiment of the photovoltaic module described above, adjacent cells in the cell string are connected in series by solder ribbons, and a third buffer support structure is provided between the stacked portions of adjacent cells; the third buffer support structure directly supports the stacked portions of adjacent cells and / or directly supports the portion of the solder ribbon located between the stacked portions of adjacent cells and the stacked portions of the cells.
[0018] In the preferred technical solution of the photovoltaic module described above, a fourth buffer support structure is provided at the end face of the cell laminated with adjacent cells near the busbar. The fourth buffer support structure is fixedly connected to the third buffer support structure or integrally formed.
[0019] In the preferred embodiment of the photovoltaic module described above, the third buffer support structure is a buffer adhesive; and / or the fourth buffer support structure is a buffer adhesive.
[0020] In the preferred embodiment of the photovoltaic module described above, the busbar is located in the gap between two adjacent battery strings, the width of the busbar is greater than the width of the gap, and the buffer support structure is provided between the battery cells of the two adjacent battery strings and the busbar.
[0021] In the preferred embodiment of the photovoltaic module described above, two sets of buffer support structures are provided between the cells and the busbars of two adjacent battery strings (1′). One set of buffer support structures is located between the cells and the busbars of one battery string (1′), and the other set of buffer support structures is located between the cells and the busbars of another battery string (1′). Alternatively, a set of buffer support structures is provided between the cells and the busbars of two adjacent battery strings (1′), with a portion of the same buffer support structure located between the cells and the busbars of one battery string (1′), and another portion of the same buffer support structure located between the cells and the busbars of another battery string (1′).
[0022] In the preferred technical solution of the photovoltaic module described above, the busbar is a jumper busbar.
[0023] In the preferred embodiment of the photovoltaic module described above, the photovoltaic module includes at least two battery packs, each battery pack being formed by connecting at least two batteries in series and parallel, and the at least two battery packs being connected in series; the positive terminals of at least two battery packs are located on the same side of the photovoltaic module and are connected in series by means of the jumper busbar, or the battery strings in the battery packs are connected in reverse parallel with diodes by means of the jumper busbar.
[0024] In the preferred technical solution of the photovoltaic module described above, the battery pack includes n parallel battery strings, the battery cells are segmented battery cells, and the segmented battery cells are 1 / n whole battery cells; where n is a positive integer greater than or equal to 2.
[0025] In the preferred embodiment of the photovoltaic module described above, the busbar and the surfaces of the solar cells facing each other are insulated from each other.
[0026] In the preferred embodiment of the photovoltaic module described above, an insulating material layer (31) is provided on the surface of the busbar facing the cell so that the surfaces of the busbar and the cell facing each other are insulated from each other.
[0027] In the preferred technical solution of the photovoltaic module described above, the first buffer support structure is integrally formed with the insulating material layer (31).
[0028] In the preferred embodiment of the photovoltaic module described above, the photovoltaic module includes a panel and a backsheet, the battery string is encapsulated between the panel and the backsheet, and the busbar is located between the battery string (1′) and the panel or the backsheet.
[0029] In the preferred embodiment of the photovoltaic module described above, the busbar is located between the battery string (1′) and the backsheet.
[0030] When the above technical solution is adopted, the photovoltaic module includes a battery string and a busbar located on one side of the battery string. The battery string includes multiple battery cells connected in series. The multiple battery cells are arranged along the length direction of the battery string, and each battery cell is also stacked with adjacent battery cells in a direction perpendicular to the battery cells. The busbar extends along the length direction of the battery string. A buffer support structure is provided between the battery cells and the busbar.
[0031] With this configuration, during the lamination process of photovoltaic modules, the buffer support structure can reduce the stress caused by the compression of the busbar on the side edge of the cell that is parallel to the busbar and at the smallest distance, thereby reducing the risk of microcracks on the side edge of the cell that is parallel to the busbar and at the smallest distance.
[0032] Preferably, the buffer support structure includes a first buffer support structure, which is disposed between the surface of the battery cell facing the busbar and the busbar.
[0033] With this configuration, the compressive force exerted by the busbar on the side edge of the solar cell that is parallel to the busbar and has the smallest distance from it is at least partially transferred to the adjacent solar cell through the first buffer support structure. This reduces the compressive force on the side edge of the solar cell that is parallel to the busbar and has the smallest distance from it, thereby reducing the stress on that side edge and lowering the risk of microcracks. Furthermore, the compressive force between the stacked portions of adjacent solar cells is correspondingly reduced, and the stress on the stacked portions of adjacent solar cells is also correspondingly reduced, further lowering the risk of microcracks in the stacked portions of adjacent solar cells.
[0034] The first buffer support structure is configured to maintain a certain gap between the side edge of the battery cell that is parallel to the busbar and has the smallest distance from it and the busbar.
[0035] This design essentially avoids contact between the side edge of the solar cell that is parallel to and closest to the busbar and the busbar. This side edge is no longer subjected to the compressive force of the busbar, thus eliminating the stress generated by the compressive force on this side edge and further reducing the risk of microcracks. Simultaneously, the compressive force between the stacked portions of adjacent solar cells is also further reduced, further decreasing the stress in the stacked portions and further lowering the risk of microcracks in the stacked portions of adjacent solar cells.
[0036] Preferably, the first buffer support structure includes a first buffer support block, and the battery cell includes a first end away from the busbar and a second end close to the busbar, with the first buffer support block located near the first end.
[0037] With this design, the first buffer support block can effectively buffer and support the battery cells and busbars, reducing the compressive force on the side edge of the battery cell that is parallel to the busbar and at the smallest distance, as well as the compressive force between the stacked portions of adjacent battery cells. This reduces the stress on the side edge of the battery cell that is parallel to the busbar and at the smallest distance, as well as the stress on the stacked portions of adjacent battery cells, thereby reducing the risk of microcracks on the side edge of the battery cell that is parallel to the busbar and at the smallest distance, and the risk of microcracks in the stacked portions of adjacent battery cells. Furthermore, the structure is relatively simple, easy to manufacture and install, and has a relatively low manufacturing cost.
[0038] Preferably, the first buffer support structure further includes a second buffer support block, which is located in the region of the first buffer support block near the second end.
[0039] With this configuration, the first and second buffer support blocks work together to support and buffer the battery cells and busbars, which can more effectively reduce the stress on the side edge of the battery cell that is parallel to the busbar and at the smallest distance, as well as the stress on the stacked portion of adjacent battery cells. This reduces the risk of microcracks on the side edge of the battery cell that is parallel to the busbar and at the smallest distance, as well as the risk of microcracks on the stacked portion of adjacent battery cells.
[0040] Preferably, there are multiple second buffer support blocks, and the first buffer support block and multiple second buffer support blocks are evenly distributed along the length direction of the battery string.
[0041] With this configuration, the first and second buffer support blocks provide more uniform support to the solar cells, which reduces the bending deformation of the solar cells and thus reduces the internal stress, thereby lowering the risk of solar cell breakage.
[0042] Preferably, the first buffer support structure includes a buffer support bar that extends along the length of the battery string and spans the non-stacked portion of a single battery cell.
[0043] With this configuration, the buffer support bar can more reliably buffer and support the solar cells and busbars, effectively reducing the stress on the side edge of the solar cell that is parallel to the busbar and at the smallest distance, as well as the stress on the stacked portion of adjacent solar cells. This reduces the risk of microcracks on the side edge of the solar cell that is parallel to the busbar and at the smallest distance, as well as the risk of microcracks on the stacked portion of adjacent solar cells. Furthermore, it can reduce the bending deformation of the solar cells, thereby reducing the internal stress of the solar cells and lowering the risk of solar cell breakage.
[0044] Preferably, the buffer support structure includes a second buffer support structure, which is disposed between the side edge of the battery cell that is parallel to the busbar and has the smallest distance from it.
[0045] By employing this design, the second buffer support structure prevents the side edge of the battery cell that is parallel to and closest to the busbar from making direct contact with the busbar's rigid line. This increases the stress-bearing area of the side edge and its vicinity, and avoids abrupt pressure changes in this area, thereby reducing the risk of microcracks at the side edge. When the first buffer support structure maintains a certain gap between the side edge and the busbar, the addition of the second buffer support structure further mitigates the risk of microcracks at this point. In rare cases where the busbar deforms, reducing the gap, the second buffer support structure prevents direct contact between the side edge and the busbar, further reliably reducing the risk of microcracks at this point.
[0046] Preferably, the second buffer support structure includes a buffer pad, which has a first support surface, a second support surface and a third support surface. The first support surface and the second support surface are connected to each other. The connection area of the first support surface and the second support surface supports the side edge of the battery cell that is parallel to the busbar and has the smallest distance. The first support surface and the second support surface respectively support the two surfaces of the battery cell that form the side edge. The third support surface supports the busbar.
[0047] This setup reliably supports the busbar and the side edge, reducing the risk of hidden cracks in the side edge.
[0048] Preferably, the buffer pad further includes a fourth support surface that supports the surface of the adjacent battery cell facing the busbar.
[0049] With this configuration, a portion of the compressive force exerted by the busbar on the side edge of the battery cell can be transferred to the surface of the adjacent battery cell via the buffer pad between the fourth and third support surfaces, thereby reducing the compressive force exerted by the busbar on the side edge of the battery cell and lowering the risk of microcracks on the side edge of the battery cell.
[0050] Preferably, the buffer pad has a first part and a second part in the area between the third support surface and the fourth support surface, and the first part and the second part are distributed sequentially along the direction from the fourth support surface toward the third support surface, and the elastic modulus of the first part is less than that of the second part.
[0051] This design reduces the rate of stress increase in the area supported by the fourth support surface during lamination, preventing rapid stress changes that could easily cause cell breakage. Furthermore, the larger compressibility of the first part prevents excessive pressure from the fourth support surface on the cell surface after lamination, thus avoiding cell breakage.
[0052] Preferably, adjacent cells in the battery string are connected in series by solder ribbons, and a third buffer support structure is provided between the stacked portions of adjacent cells; the third buffer support structure directly supports the stacked portions of adjacent cells and / or directly supports the portion of the solder ribbon located between the stacked portions of adjacent cells and the stacked portions of the cells.
[0053] The third buffer support structure directly supports the stacked portions of adjacent solar cells. This reduces the compressive force transmitted between the stacked portions of adjacent solar cells through the solder ribbons, thereby reducing the stress generated by the compression of the stacked portions of adjacent solar cells under the solder ribbons, and thus lowering the risk of microcracks in the stacked portions of adjacent solar cells. The third buffer support structure directly supports the portion of the solder ribbons located between the stacked portions of adjacent solar cells and the stacked portions of the solar cells, avoiding direct, rigid contact between the stacked portions of adjacent solar cells and the solder ribbon portion between them, thus reducing the stress generated by the compression of the stacked portions of adjacent solar cells, and further lowering the risk of microcracks in the stacked portions of adjacent solar cells.
[0054] Preferably, a fourth buffer support structure is provided at the end face of the battery cell laminated with adjacent battery cells near the busbar, and the fourth buffer support structure is fixedly connected to the third buffer support structure or integrally formed.
[0055] This design not only adds new buffer support to the solar cells through the fourth buffer support structure, but also protects the side edge of the laminated solar cell near the busbar from excessive stress on the side edge, preventing microcracks.
[0056] Preferably, the third buffer support structure is a buffer adhesive; and / or the fourth buffer support structure is a buffer adhesive.
[0057] This setup makes it easier to configure the third and / or fourth buffer support structures. Attached Figure Description
[0058] The preferred embodiments of this utility model will now be described with reference to the accompanying drawings, in which:
[0059] Figure 1 This is a partial top view of the photovoltaic module according to the first embodiment of this utility model;
[0060] Figure 2This is a partial bottom view of the photovoltaic module according to the first embodiment of this utility model;
[0061] Figure 3 It is along Figure 1 A cross-sectional view of the AA plane;
[0062] Figure 4 yes Figure 3 A magnified view of part B in the middle;
[0063] Figure 5 This is a partial embodiment of the photovoltaic module of the second embodiment of the present invention. Figure 3 Enlarged view of section B in the middle;
[0064] Figure 6 This is a partial embodiment of the photovoltaic module of the third embodiment of the present invention. Figure 3 Enlarged view of section B in the middle;
[0065] Figure 7 This is a partial embodiment of the photovoltaic module in the fourth embodiment of the present invention. Figure 3 Enlarged view of section B in the middle;
[0066] Figure 8 This is a partial embodiment of the photovoltaic module of the fifth embodiment of the present invention. Figure 3 Enlarged view of section B in the middle;
[0067] Figure 9 This is a partial embodiment of the photovoltaic module of the sixth embodiment of the present invention. Figure 3 Enlarged view of section B in the middle;
[0068] Figure 10 This is a partial embodiment of the photovoltaic module in the seventh embodiment of the present invention. Figure 3 Enlarged view of section B in the middle;
[0069] Figure 11 yes Figure 10 A magnified view of part C in the middle;
[0070] Figure 12 This is a partial embodiment of the photovoltaic module of the eighth embodiment of the present invention. Figure 10 Enlarged view of section C in the middle;
[0071] Figure 13 This is the ninth embodiment of the photovoltaic module's buffer pad in this utility model. Figure 12 A diagram showing the location;
[0072] Figure 14 This is a partial bottom view of the photovoltaic module according to the tenth embodiment of this utility model;
[0073] Figure 15 This is an electrical diagram of a photovoltaic module according to one embodiment of the present invention;
[0074] Figure 16 This is an electrical diagram of a photovoltaic module according to another embodiment of the present invention.
[0075] List of reference numerals in the attached diagram:
[0076] 1. Segmented battery cell; 1'. Battery string; 11. First grid line; 12. Second grid line; 13. Side edge; 2. Solder ribbon; 3. Jumper busbar; 3'. Jumper; 31. Insulating material layer; 4. Gap; 51. First buffer support block; 52. Second buffer support block; 53. Buffer support bar; 61. First buffer adhesive layer; 62. Second buffer adhesive layer; 63. Third buffer adhesive layer; 7. Buffer pad; 71. First support surface; 72. Second support surface; 73. Third support surface; 74. Fourth support surface; 751. First part; 752. Second part; 8. Diode. Detailed Implementation
[0077] First, those skilled in the art should understand that the embodiments described below are merely for explaining the technical principles of this utility model and are not intended to limit the scope of protection of this utility model.
[0078] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "front," and "rear," which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," "third," "fourth," "fifth," "sixth," "seventh," "eighth," "ninth," and "tenth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0079] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0080] Based on the issue mentioned in the background art that the side edge of the shingled solar cell near the jumper busbar and in contact with the jumper busbar is prone to microcracks during the lamination process, this utility model provides a photovoltaic module in which a buffer support structure can reduce the stress caused by the busbar compression on the side edge of the solar cell that is parallel to and closest to the busbar during the lamination process, thereby reducing the risk of microcracks on the side edge of the solar cell that is parallel to and closest to the busbar.
[0081] The circuit connection method of the photovoltaic module of this utility model will be described in detail below.
[0082] like Figure 15 As shown, in one embodiment of this utility model, the photovoltaic module includes multiple slab cells 1, each slab cell being a three-piece cell (i.e., a single cell cut into three pieces). Multiple slab cells 1 are connected in series to form a cell string 1', and three cell strings 1' are connected in parallel to form a battery pack. In each battery pack, a diode 8 is connected in reverse parallel via a jumper 3', and the three battery packs are connected in series. When arranging the cells of the photovoltaic module, the three battery packs are arranged according to... Figure 13 The battery cells 1 in the battery string 1' are arranged in a shingled configuration. The two jumpers 3' extend in a direction parallel to the length of the battery string 1', and the jumpers 3' use jumper busbars to transmit current.
[0083] like Figure 16 As shown, in another embodiment of this utility model, the photovoltaic module includes multiple slab cells 1, each slab cell 1 being a four-slab cell (i.e., a single cell cut into four pieces). Multiple slab cells 1 are connected in series to form a cell string 1', and four cell strings 1' are connected in parallel to form a cell pack. In each cell pack, a diode 8 is connected in reverse parallel to the cell string 1', and the three cell packs are connected in series. In the first two cell packs, the negative terminals of two cell strings are opposite to the negative terminals of the other two cell strings, while the positive terminals are opposite. In the third cell pack, the positive terminals of two cell strings are opposite to the positive terminals of the other two cell strings, while the negative terminals are opposite. To connect the diode 8 in reverse parallel to each cell pack and to connect the three cell packs in series, a jumper 3' is required. When arranging the cells in the photovoltaic module, the three cell packs are arranged according to... Figure 14 The battery cells 1 in the battery string 1' are arranged in a shingled configuration. The three jumpers 3' extend in a direction parallel to the length of the battery string 1', and the jumpers 3' use jumper busbars to transmit current.
[0084] The structure of the photovoltaic module of this utility model will be described below.
[0085] In the first embodiment of this utility model, such as Figures 1 to 4 As shown, the photovoltaic module includes a panel (not shown), a backsheet (not shown), a string of cells encapsulated between the panel and the backsheet, and a jumper busbar 3 located between the cell string and the backsheet. The cell string includes multiple segmented solar cells 1 connected in series. Figure 1 Two segmented battery cells 1 are illustrated in the example.
[0086] Multiple segmented solar cells 1 are arranged along the length of the solar cell string (i.e., Figure 1The cells are arranged in a left-right direction, and each cell 1 is also stacked with adjacent cells 1 in a direction perpendicular to the cell 1. Adjacent cells 1 in the battery string are connected in series by solder ribbons 2. The portion of the solder ribbon 2 between the stacked portions of adjacent cells 1 has a flat structure. Jumper busbars 3 are located in the middle region of the cells 1 and extend along the length of the battery string. The surfaces of the jumper busbars 3 and the cells 1 facing each other are insulated from each other; specifically, an insulating material layer 31 is provided on the surface of the jumper busbars 3 facing the cells 1, so that the surfaces of the jumper busbars 3 and the cells 1 facing each other are insulated from each other. The cells 1 and the jumper busbars 3 form an angle.
[0087] The front of the segmented battery cell 1 has multiple edges. Figure 1 The first grid line 11 extends in the left-right direction, and multiple first grid lines 11 are along... Figure 1 The cells are arranged at intervals in the top and bottom direction. Multiple edges are provided on the back of the segmented solar cells 1. Figure 1 The second grid line 12 extends in the left-right direction, and multiple second grid lines 12 are along Figure 1 Arranged at intervals in the top and bottom directions.
[0088] A buffer support structure is provided between the segmented battery cell 1 and the jumper busbar 3 to reduce the side edge of the segmented battery cell 1 that is parallel to and has the smallest distance from the jumper busbar (i.e., Figure 4 The stress caused by the compression of the jumper busbar 3 on the side edge 13) of the cell. The buffer support structure includes a first buffer support structure, which is disposed between the surface of the cell 1 facing the jumper busbar 3 and the jumper busbar 3. Specifically, a gap 4 is formed between the non-stacked portion of the cell 1 and the insulating material layer 31 of the jumper busbar 3. The first buffer support structure is disposed in the gap 4, and the first buffer support structure includes a first buffer support block 51. The cell 1 includes a first end away from the jumper busbar 3 (i.e., Figure 1 The left end of the split-cell battery cell 1 and the second end near the jumper bus bar 3 (i.e. Figure 1 The first buffer support block 51 is located near the first end of the segmented battery cell 1 (right end of the segmented battery cell 1).
[0089] The first buffer support block 51 is located near the first end of the segmented battery cell 1. The first buffer support block 51 provides excellent buffer support for the segmented battery cell 1 and the jumper busbar 3. At least part of the compressive force exerted by the jumper busbar 3 on the side edge 13 is transferred to the adjacent segmented battery cell 1 via the first buffer support block 51, reducing the compressive force on the side edge 13 and thus reducing the stress on the side edge 13, lowering the risk of microcracks in the side edge 13. Furthermore, the compressive force between the stacked portions of adjacent segmented battery cells 1 is correspondingly reduced, and the stress in the stacked portions of adjacent segmented battery cells 1 is also correspondingly reduced, further lowering the risk of microcracks in the stacked portions of adjacent segmented battery cells 1.
[0090] Preferably, the first buffer support block 51 is integrally formed with the insulating material layer 31. When the jumper busbar 3 with the insulating material layer 31 is installed in place and the segmented battery cell 1 is installed, the first buffer support block 51 is also installed in place, which makes the installation of the first buffer support block 51 more convenient.
[0091] In the second embodiment of this utility model, the difference from the first embodiment is that, as Figure 5 As shown, the first buffer support structure also includes a second buffer support block 52, which is located in the region of the first buffer support block 51 near the second end of the segmented battery cell 1. Specifically, there are multiple second buffer support blocks 52, and the first buffer support block 51 and the multiple second buffer support blocks 52 are evenly distributed along the length direction of the battery string.
[0092] With this configuration, the first buffer support block 51 and the second buffer support block 52 work together to support and buffer the segmented battery cells 1 and the jumper busbar 3. This effectively reduces the stress on the side edge 13 and the stress on the stacked portion of adjacent segmented battery cells 1, thereby reducing the risk of microcracks in the side edge 13 and the stacked portion of adjacent segmented battery cells 1. The first buffer support block 51 and multiple second buffer support blocks 52 are evenly distributed along the length of the battery string, making the supporting force of the first buffer support block 51 and the second buffer support block 52 on the segmented battery cells 1 and the jumper busbar 3 more uniform. This reduces the bending deformation of the segmented battery cells 1 and the internal stress of the segmented battery cells 1, thereby reducing the risk of the segmented battery cells 1 breaking.
[0093] It should be noted that, in one feasible configuration, only one second buffer support block 52 may be configured.
[0094] In the third embodiment of this utility model, the difference from the first embodiment is that, as follows: Figure 6As shown, the first buffer support structure includes a buffer support bar 53, which extends along the length of the battery string and spans the non-stacked portion of a single segmented battery cell 1. That is, the buffer support bar 53 fills the entire gap 4.
[0095] With this setup, gap 4 is essentially eliminated, and buffer support bar 53 can more reliably buffer and support the sectional battery cell 1 and jumper busbar 3, effectively reducing the stress on the side edge 13 and the stress on the stacked portion of adjacent sectional battery cells 1, thereby reducing the risk of microcracks in the side edge 13 and the stacked portion of adjacent sectional battery cells 1, and reducing the bending deformation of the sectional battery cell 1, thereby reducing the stress inside the sectional battery cell 1 and reducing the risk of battery cell breakage.
[0096] In the fourth embodiment of this utility model, the difference from the first embodiment is that, as follows: Figure 7 As shown, a third buffer support structure is provided between the stacked portions of adjacent cell 1. The third buffer support structure includes a first buffer adhesive layer 61 laid between the stacked portions of adjacent cell 1 in the area avoiding the solder strip 2, and the first buffer adhesive layer 61 directly supports the stacked portions of adjacent cell 1.
[0097] This configuration reduces the compressive force transmitted between the stacked portions of adjacent cell 1 via the solder ribbon 2, thereby reducing the stress generated by the compression of the stacked portions of adjacent cell 1 by the solder ribbon 2, and further reducing the risk of microcracks in the stacked portions of adjacent cell 1.
[0098] It should be noted that the first buffer layer 61 can also be replaced with a rubber strip, silicone strip, or other suitable buffer support structure.
[0099] In the fifth embodiment of this utility model, the difference from the fourth embodiment is that, as Figure 8 As shown, the third buffer support structure includes a second buffer adhesive layer 62 laid between the stacked portion of adjacent sectional battery cells 1 and the solder ribbon 2. The second buffer adhesive layer 62 directly supports the portion of the solder ribbon 2 located between the stacked portions of adjacent sectional battery cells 1 and the stacked portion of the sectional battery cells 1.
[0100] This design avoids direct, rigid contact between the stacked portions of adjacent solar cells 1 and the solder strips 2 between them, thereby reducing the stress caused by compression of the stacked portions of adjacent solar cells 1 and further reducing the risk of microcracks in the stacked portions of adjacent solar cells 1.
[0101] It should be noted that the second buffer layer 62 can also be replaced with a rubber strip, silicone strip, or other suitable buffer support structure.
[0102] In the sixth embodiment of this utility model, the difference from the fourth embodiment is that, as Figure 9 As shown, a fourth buffer support structure is provided at the end face of the cell 1 laminated with adjacent cell 1 near the jumper busbar 3. The fourth buffer support structure is integrally formed with the third buffer support structure. Specifically, the fourth buffer support structure is a third buffer adhesive layer 63. The third buffer adhesive layer 63 is integrally formed with the first buffer adhesive layer 61. When the first buffer adhesive layer 61 is laid, a portion of the buffer adhesive overflows to the end face of the cell 1 laminated with adjacent cell 1 near the jumper busbar 3, thereby forming the third buffer adhesive layer 63. This facilitates the installation of the first buffer adhesive layer 61 and the third buffer adhesive layer 63, simplifying the process.
[0103] With this setup, not only can the fourth buffer support structure add new buffer support to the sectional battery cell 1, but it can also protect the edge of the laminated sectional battery cell 1 near the jumper busbar 3 from the edge of the sectional battery cell 1 laminated on it, thus preventing excessive stress on the edge and the generation of microcracks.
[0104] It should be noted that the third buffer layer 63 can also be replaced with a rubber strip, silicone strip or other suitable buffer support structure, and the third buffer support structure is fixedly connected to the first buffer support structure.
[0105] In the seventh embodiment of this utility model, unlike the first embodiment, the buffer support structure further includes a second buffer support structure, which is disposed between the side edge 13 and the jumper busbar 3. Specifically, as shown... Figure 10 and Figure 11 As shown and referenced Figure 10 As shown, a buffer pad 7, serving as a second buffer support structure, is provided between the side edge 13 and the jumper busbar 3. The vertical cross-section of the buffer pad 7 is approximately L-shaped. The buffer pad 7 has a first support surface 71, a second support surface 72, and a third support surface 73. The first support surface 71 and the second support surface 72 are connected to each other. The connection area of the first support surface 71 and the second support surface 72 supports the side edge 13. The first support surface 71 and the second support surface 72 respectively support the two surfaces of the segmented battery cell 1 that form the side edge 13. The third support surface 73 supports the jumper busbar 3.
[0106] With this configuration, the second buffer support structure avoids hard line contact between the side edge 13 and the jumper busbar 3, increases the stress area of the side edge 13 and its vicinity, and avoids abrupt pressure changes in the side edge 13 and its vicinity, thereby reducing the risk of hidden cracks in the side edge 13.
[0107] In the eighth embodiment of this utility model, the difference from the seventh embodiment is that, as Figure 12As shown, the buffer pad 7 also has a fourth support surface ( Figure 12 Not shown in the image, please refer to the image below. Figure 13 The fourth support surface 74 in the middle supports the surface of the adjacent segmented battery cell 1 facing the jumper busbar 3.
[0108] This configuration adds new support to the sectional battery cells 1 and the jumper busbars 3. A portion of the compressive force exerted by the jumper busbars 3 on the side edges 13 of the sectional battery cells 1 can be transferred to the surface of the adjacent sectional battery cells 1 via the buffer pad 7 between the fourth support surface and the third support surface 73. This reduces the compressive force exerted by the jumper busbars 3 on the side edges 13 of the sectional battery cells 1, lowers the risk of microcracks in the side edges 13 of the sectional battery cells 1, and reduces the stress in the stacked portion of the adjacent sectional battery cells 1, thereby reducing the risk of microcracks in the stacked portion of the adjacent sectional battery cells 1.
[0109] In the ninth embodiment of this utility model, the difference from the eighth embodiment is that, as Figure 13 As shown, the buffer pad 7 has a first part 751 and a second part 752 in the area between the third support surface 73 and the fourth support surface 74. The first part 751 and the second part 752 are distributed sequentially along the direction from the fourth support surface 74 toward the third support surface 73. The elastic modulus of the first part 751 is less than that of the second part 752.
[0110] With this configuration, during the lamination process, the rate of stress increase in the area of the sectional solar cell 1 supported by the fourth support surface 74 can be reduced, preventing the sectional solar cell 1 from cracking due to rapid stress changes. Furthermore, the large compressibility of the first part 751 prevents excessive pressure from the fourth support surface 74 on the surface of the sectional solar cell 1 after lamination, thus avoiding cracking of the sectional solar cell 1.
[0111] In the tenth embodiment of this utility model, the difference from the first embodiment is that, as Figure 14As shown, the jumper busbar 3 is located at the gap between the battery strings. The width of the jumper busbar 3 is greater than the width of the gap between the battery strings, and a first buffer support structure is provided between the battery cells 1 of adjacent battery strings and the jumper busbar 3. It can be understood that the first buffer support structure may include a set of first buffer support blocks 51. A part of the same first buffer support block 51 is located between the non-stacked portion of the battery cells 1 of one battery string and the jumper busbar 3, and another part of the same first buffer support block 51 is located between the non-stacked portion of the battery cells 1 of another battery string and the jumper busbar 3. The first buffer support structure may include two sets of first buffer support blocks 51, one set of first buffer support blocks 51 is located between the non-stacked portion of the battery cells 1 of one battery string and the jumper busbar 3, and the other set of first buffer support blocks 51 is located between the non-stacked portion of the battery cells 1 of another battery string and the jumper busbar 3.
[0112] It should be noted that in the above embodiments, the first buffer layer 61, the second buffer layer 62, and the third buffer layer 63 can be made of UV silicone or thermosetting silicone, and the materials used for the first buffer layer 61, the second buffer layer 62, and the third buffer layer 63 can be the same or different. Additionally, an insulating material layer 31 is provided on the surface of the jumper busbar 3 facing the segmented battery cell 1, so that the surfaces of the jumper busbar 3 and the segmented battery cell 1 facing each other are insulated from each other. This is only one specific arrangement, and it can be adjusted in practical applications. For example, an insulating material layer can be provided on the area of the segmented battery cell 1 facing the jumper busbar 3, so that the surfaces of the jumper busbar 3 and the segmented battery cell 1 facing each other are insulated from each other. Furthermore, the jumper busbar 3 is located between the battery string and the backplate, which is also a preferred arrangement. This can be adjusted in practical applications; for example, the jumper busbar 3 can also be located between the battery string and the panel.
[0113] It should also be noted that the circuit structure of the photovoltaic module of this utility model is not limited to... Figure 15 and Figure 16 The connection method in a photovoltaic module. When the positive terminals of battery packs connected in series are on opposite sides of the photovoltaic module, jumpers are necessary to connect the battery packs in series. When three or more battery packs are arranged in an array within a photovoltaic module, jumpers will extend from the middle of the battery string along the length of the battery string.
[0114] In some other feasible embodiments, based on the second and third embodiments, a third buffer support structure is added in the fourth or fifth embodiment, or a third buffer support structure and a fourth buffer structure are added in the sixth embodiment.
[0115] In another feasible embodiment, unlike the seventh embodiment, the first buffer support structure is not included.
[0116] In some other feasible embodiments, unlike the embodiments described above, the jumper busbar 3 can also be a busbar for other connecting wires in the photovoltaic module.
[0117] In some other feasible embodiments, unlike the embodiments described above, the segmented battery cell 1 can also be replaced with a whole battery cell.
[0118] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.
Claims
1. A photovoltaic module, characterized in that, The photovoltaic module includes a battery string (1′) and a busbar located on one side of the battery string (1′). The battery string (1′) includes a plurality of battery cells connected in series. The plurality of battery cells are arranged along the length direction of the battery string and each battery cell is also stacked with an adjacent battery cell in a direction perpendicular to the battery cell. The busbar extends along the length direction of the battery string. A buffer support structure is provided between the battery cell and the busbar.
2. The photovoltaic module according to claim 1, characterized in that, The buffer support structure includes a first buffer support structure, which is disposed between the surface of the battery cell facing the busbar and the busbar.
3. The photovoltaic module according to claim 2, characterized in that, The first buffer support structure is configured such that the side edge (13) of the battery cell that is parallel to the busbar and has the smallest distance from it maintains a certain gap with the busbar.
4. The photovoltaic module according to claim 2 or 3, characterized in that, The first buffer support structure includes a first buffer support block (51), and the battery cell includes a first end away from the busbar and a second end close to the busbar. The first buffer support block (51) is located close to the first end.
5. The photovoltaic module according to claim 4, characterized in that, The first buffer support structure further includes a second buffer support block (52), which is located in the region of the first buffer support block (51) near the second end.
6. The photovoltaic module according to claim 5, characterized in that, There are multiple second buffer support blocks (52), and the first buffer support block (51) and the multiple second buffer support blocks (52) are evenly distributed along the length direction of the battery string.
7. The photovoltaic module according to claim 2 or 3, characterized in that, The first buffer support structure includes a buffer support bar (53) that extends along the length of the battery string and spans the non-stacked portion of a single battery cell.
8. The photovoltaic module according to any one of claims 1 to 3, characterized in that, The buffer support structure includes a second buffer support structure, which is disposed between the side edge (13) of the battery cell that is parallel to the busbar and has the smallest distance from it and the busbar.
9. The photovoltaic module according to claim 8, characterized in that, The second buffer support structure includes a buffer pad (7), which has a first support surface (71), a second support surface (72) and a third support surface (73). The first support surface (71) and the second support surface (72) are connected to each other. The connection area of the first support surface (71) and the second support surface (72) supports the side edge (13). The first support surface (71) and the second support surface (72) respectively support the two surfaces of the battery cell that form the side edge (13). The third support surface (73) supports the busbar.
10. The photovoltaic module according to claim 9, characterized in that, The buffer pad (7) also has a fourth support surface (74) that supports the adjacent battery cell facing the busbar.
11. The photovoltaic module according to claim 10, characterized in that, The buffer pad has a first portion (751) and a second portion (752) between the area of the third support surface (73) directly opposite the fourth support surface (74) and the fourth support surface (74). The first portion (751) and the second portion (752) are distributed sequentially along the direction of the fourth support surface (74) toward the third support surface (73). The elastic modulus of the first portion (751) is smaller than that of the second portion (752).
12. The photovoltaic module according to any one of claims 1 to 3, characterized in that, In the battery string (1′), adjacent battery cells are connected in series by solder strips (2), and a third buffer support structure is provided between the stacked portions of adjacent battery cells; The third buffer support structure directly supports the stacked portion of the adjacent battery cells and / or directly supports the portion of the solder strip (2) located between the stacked portions of the adjacent battery cells and the stacked portion of the battery cells.
13. The photovoltaic module according to claim 12, characterized in that, A fourth buffer support structure is provided at the end face of the battery cell that is laminated with adjacent battery cells near the busbar. The fourth buffer support structure is fixedly connected to the third buffer support structure or is integrally formed.
14. The photovoltaic module according to claim 13, characterized in that, The third buffer support structure is a buffer adhesive; and / or the fourth buffer support structure is a buffer adhesive.
15. The photovoltaic module according to any one of claims 1 to 3, characterized in that, The busbar is located in the gap between two adjacent battery strings (1′), and the width of the busbar is greater than the width of the gap. The buffer support structure is provided between the battery cells of the two adjacent battery strings (1′) and the busbar.
16. The photovoltaic module according to claim 15, characterized in that, Two sets of buffer support structures are provided between the battery cells and the busbar of two adjacent battery strings (1′). One set of buffer support structures is located between the battery cells and the busbar of one battery string (1′), and the other set of buffer support structures is located between the battery cells and the busbar of the other battery string (1′). Alternatively, a set of buffer support structures may be provided between the battery cells and the busbar of two adjacent battery strings (1′), with a portion of the same buffer support structure located between the battery cells and the busbar of one battery string (1′) and another portion of the same buffer support structure located between the battery cells and the busbar of another battery string (1′).
17. The photovoltaic module according to any one of claims 1 to 3, characterized in that, The busbar is a jumper busbar (3).
18. The photovoltaic module according to claim 17, characterized in that, The photovoltaic module includes at least two battery packs, each battery pack being formed by at least two battery strings (1′) connected in parallel, and the at least two battery packs being connected in series. At least two of the battery packs have their positive terminals located on the same side of the photovoltaic module and connected in series via the jumper bus (3), or the battery strings (1') within the battery pack are connected in reverse parallel with diodes (8) via the jumper bus (3).
19. The photovoltaic module according to claim 18, characterized in that, The battery pack includes n parallel battery strings (1′), and the battery cell is a segmented battery cell (1), which is a whole battery cell of 1 / n. Where n is a positive integer greater than or equal to 2.
20. The photovoltaic module according to claim 2 or 3, characterized in that, The busbar and the surface of the battery cell facing each other are insulated from each other.
21. The photovoltaic module according to claim 20, characterized in that, An insulating material layer (31) is provided on the surface of the busbar facing the battery cell so that the surfaces of the busbar and the battery cell facing each other are insulated from each other.
22. The photovoltaic module according to claim 21, characterized in that, The first buffer support structure is integrally formed with the insulating material layer (31).
23. The photovoltaic module according to any one of claims 1 to 3, characterized in that, The photovoltaic module includes a panel and a backsheet, the battery string is encapsulated between the panel and the backsheet, and the busbar is located between the battery string (1′) and the panel or the backsheet.
24. The photovoltaic module according to claim 23, characterized in that, The busbar is located between the battery string (1′) and the backplate.