Battery string, photovoltaic module and photovoltaic system
By setting the interconnection strip connection parts of the raised structure in the cell string of the photovoltaic module, the problem of cell warping and unblocking caused by the shrinkage of the interconnection strip is solved, the risk of lobes is reduced, and the product quality and stability of the photovoltaic module are improved.
Patent Information
- Application Number
- CN202420781073.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-15
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-15
AI Technical Summary
During the manufacturing process of photovoltaic modules, the shrinkage of the interconnect strip causes the cell to warp and the change in the chip spacing, which in turn causes the image of the chip, increasing the risk of the cell lobe, especially in the lamination process.
A battery string is designed to provide a moving space for adjacent battery cells by providing a raised structure at the connection part of the interconnection strip, offsetting the dimensional changes caused by warping and deformation, and reducing the risk of sizing. The battery string includes a multi-piece back contact battery cell and an interconnection strip. The interconnection strip spans the gap between the chips and is provided with at least two protrusions on both sides. The protrusions can form a recessed portion, and the height of the intermediate protrusion is greater than the protrusions on both sides. , ensure uniform stress distribution and overflowing glue storage during lamination.
It effectively reduces the risk of disassembly of the cell in the lamination process, improves the product quality and yield of photovoltaic modules, reduces the possibility of the interconnection strip being crushed, and ensures the stability and efficiency of the photovoltaic system.
Smart Images
Figure CN222282032U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaic manufacturing, in particular to a battery string, a photovoltaic component and a photovoltaic system. Background Art
[0002] In the photovoltaic module manufacturing process, when interconnecting strips are used to interconnect multiple cells to form a cell string, the shrinkage of the interconnecting strips may cause the cell to warp, thereby causing changes in the spacing between adjacent cells in the cell string.
[0003] When such deformed battery strings are used in the lamination process, it is easy to cause the battery cells to be paralleled and thus cause the battery cells to split. Utility Model Content
[0004] The utility model provides a battery string, a photovoltaic module and a photovoltaic system, aiming to solve the problem that the battery cells are warped due to the shrinkage of interconnection strips when preparing the battery string, which easily leads to the cracking of the battery cells in the lamination process.
[0005] The present invention provides a battery string, the battery string comprising:
[0006] A plurality of back-contact battery sheets, each of which has a plurality of interconnection bar connection portions spaced apart along a first direction on a surface of the back-contact battery sheet, the plurality of interconnection bar connection portions including edge interconnection bar connection portions located at two ends of the first direction;
[0007] A plurality of interconnecting bars, wherein the interconnecting bars are electrically connected to the interconnecting bar connecting portion, and the interconnecting bars span the inter-sheet gap between two adjacent back-contact battery sheets to interconnect the plurality of back-contact battery sheets together along a first direction;
[0008] At least two protrusions are provided at a portion of the interconnection bar between two edge interconnection bar connection portions on both sides of the inter-sheet gap.
[0009] Optionally, the number of the protrusions is two, a recessed portion is formed between the two protrusions, and the recessed portion is located in the area where the inter-sheet gap is located.
[0010] Optionally, the number of the protrusions is three, and the middle protrusion is located in the area where the inter-sheet gap is located.
[0011] Optionally, the height of the protrusion in the middle is greater than the height of the protrusions on both sides.
[0012] Optionally, the distance between the protrusions on both sides and the connecting portion of the edge interconnection strip located on the same side is L, 3mm≤L≤6.4mm.
[0013] Optionally, the distance between the two edge interconnection strip connection portions on both sides of the inter-sheet gap is D1, 12.5 mm≤D1≤13.5 mm; and / or,
[0014] The length of the interconnection bar between the two edge interconnection bar connection portions located on both sides of the inter-sheet gap is D2, and 14 mm ≤ D2 ≤ 15.5 mm.
[0015] Optionally, 0.6≤D1 / D2≤0.85.
[0016] Optionally, the width of the gap between the sheets is D3, 0.5mm≤D3≤2mm.
[0017] Optionally, the number of the protrusions is negatively correlated with the thickness of the interconnection strip.
[0018] An embodiment of the utility model further provides a photovoltaic assembly, which includes any one of the aforementioned battery strings.
[0019] Optionally, the photovoltaic module is a single-glass module, and a portion of the back plate of the single-glass module corresponding to the protrusion has a convex mark.
[0020] An embodiment of the utility model further provides a photovoltaic system, which includes any one of the photovoltaic components mentioned above.
[0021] In the embodiment of the utility model, when the interconnection strip interconnects the back-contact battery cells, causing the battery cells to warp and deform, since the interconnection strip has a protrusion in the inter-cell gap between two adjacent battery cells, the protrusion can provide partial movement space for the adjacent back-contact battery cells, so that the back-contact battery cells can undergo a small horizontal translation to offset the size change caused by the warping and deformation of the battery cells, thereby reducing the risk of battery cell splitting caused by cell parallelization. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0023] Figure 1 A schematic top view of a battery string in an embodiment of the utility model is shown;
[0024] Figure 2 The schematic diagram of the arrangement of two adjacent battery cells in the embodiment of the utility model is shown;
[0025] Figure 3A side schematic diagram of a battery string in an embodiment of the utility model is shown;
[0026] Figure 4 A side schematic diagram of another battery string in an embodiment of the utility model is shown;
[0027] Figure 5 The utility model embodiment is shown Figure 3 A local enlarged schematic diagram of the I position;
[0028] Figure 6 The utility model embodiment is shown Figure 4 A locally enlarged schematic diagram of position Ⅱ.
[0029] Description of the accompanying drawings:
[0030] Back contact cell sheet-10, interconnection bar connection portion-101, edge interconnection bar connection portion-101a, middle interconnection bar connection portion-101b, inter-sheet gap-102, protrusion-111, and recess-112. DETAILED DESCRIPTION
[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0032] Reference Figures 1 to 4 , an embodiment of the utility model provides a battery string, the battery string comprising:
[0033] A plurality of back-contact battery cells 10, each of the back-contact battery cells 10 having a plurality of interconnection bar connection portions 101 arranged at intervals along a first direction X on the surface thereof, the plurality of interconnection bar connection portions 101 including edge interconnection bar connection portions 101a located at both ends of the first direction;
[0034] A plurality of interconnection bars 11, wherein the interconnection bars 11 are electrically connected to the interconnection bar connection portion 101, and the interconnection bars 11 span the inter-sheet gap 102 between two adjacent back contact battery sheets 10, so as to interconnect the plurality of back contact battery sheets 10 together along the first direction X;
[0035] At least two protrusions 111 are provided at a portion of the interconnection bar 11 between the two edge interconnection bar connection portions 101 a on both sides of the inter-sheet gap 102 .
[0036] like Figure 1 and Figure 2As shown in FIG. 1 , the battery cell used in the battery string of the embodiment of the utility model can be a back contact battery cell 10, the main grid and the auxiliary grid of the back contact battery cell 10 are distributed on the back of the battery cell, and the back is also provided with an interconnection bar connection portion 101 for electrically connecting to the interconnection bar 11. Figure 2 As shown in the figure, a plurality of interconnection bar connections 101 are spaced apart along a first direction X on the back side of the back contact cell 10, and these interconnection bar connections 101 arranged along the first direction X are electrically connected to the main grid of the same polarity, and the two interconnection bar connections 101 located at both ends of the first direction X are edge interconnection bar connections 101a, and the other interconnection bar connections 101 between the edge interconnection bar connections 101a are intermediate interconnection bar connections 101b.
[0037] When a battery string is prepared by a string welding process, the interconnection bar connection part 101 has a solder pad, and its shape can be a rectangle or a rectangle with chamfers or other shapes. In addition, a conductive material such as a conductive glue can be applied to the interconnection bar connection part 101 to electrically connect the interconnection bar 11 with the interconnection bar connection part 101. The interconnection bar 11 extends from the edge of a back contact battery sheet 10 along the X direction shown in the figure, and then crosses the inter-sheet gap 102 between two adjacent back contact battery sheets 10, and then extends to another back contact battery sheet 10 to be electrically connected thereto, thereby obtaining a battery string.
[0038] Combination Figure 3 or Figure 4 As shown in the figure, in the battery string of the embodiment of the utility model, a part of the interconnection bar 11 is completely located in the surface area of the back contact battery cell 10, and the other part is located between the two edge interconnection bar connection parts 101a on both sides of the inter-sheet gap 102. The section of the interconnection bar 11 located between the two edge interconnection bar connection parts 101a has at least two protrusions 111, and the protrusions 111 can be a structure pre-pressed by a mold tool before the interconnection bar 11 is arranged and placed on the back of the back contact battery cell 10. Figure 3 or Figure 4 As shown in FIG. 1 , the protrusion 111 protrudes along the thickness direction of the battery cell toward the side away from the edge interconnection strip connection portion 101a. In some embodiments, the protrusion 111 may be in a curved arched shape, and the lower part of the protrusion 111 is separated from the surface of the battery cell.
[0039] Therefore, when the battery string of the embodiment of the utility model is laminated, when the interconnection bar 11 interconnects the back-contact battery cells 10 and causes the battery cells to warp and deform, since the interconnection bar 11 has a protrusion 111 in the inter-cell gap 102 between two adjacent battery cells, the protrusion 111 can provide partial movement space for the adjacent back-contact battery cells 10, so that the back-contact battery cells 10 can make a small horizontal translation to offset the size change caused by the warping and deformation of the battery cells, thereby reducing the risk of battery cell splitting caused by cell parallelization.
[0040] Optionally, refer to Figure 3 and Figure 5 There are two protrusions 111 , and a recessed portion 112 is formed between the two protrusions 111 . The recessed portion 112 is located in the area where the inter-sheet gap 102 is located.
[0041] Specifically, if Figure 3 and Figure 5 As shown, when the number of protrusions 111 is two, a recessed portion 112 is formed between the two protrusions 111, which is concave toward the side of the edge interconnection strip connection portion 101a, and the shape of the recessed portion 112 is a V-shape, a U-shape or the like. The space formed by the protrusions 111 can accommodate the overflowing glue flowing during lamination. The recessed portion 112 is located in the area where the inter-sheet gap 102 is located. For example, the lowest point of the recessed portion 112 can be located in the middle of the width direction of the inter-sheet gap 102. When the interconnection strip 11 of this shape is laminated, the stress distribution between the two edge interconnection strip connection portions 101a is more uniform, and the bending portion of the recessed portion 112 can be prevented from contacting the battery sheet during lamination, thereby reducing the risk of the interconnection strip 11 being broken.
[0042] Optionally, refer to Figure 5 The number of the protrusions 111 is three, and the middle protrusion 111 is located in the area where the inter-sheet gap 102 is located.
[0043] Specifically, if Figure 5 As shown, when there are three protrusions 111, the three protrusions 111 are connected together to form an undulating wave shape. A recessed portion 112 is formed between two protrusions 111, which is concave toward the side of the edge interconnection strip connection portion 101a. The shape of the recessed portion 112 is a V-shape or a U-shape or the like. The space formed by the protrusions 111 can accommodate the overflow glue flowing during lamination. Figure 5As shown in FIG. 1 , one recessed portion 112 is located on the left side of the middle protrusion 111, and the other recessed portion 112 is located on the right side of the middle protrusion 111. The middle protrusion 111 is located in the area where the inter-sheet gap 102 is located. For example, the highest point of the middle protrusion 111 can be located in the middle of the width direction of the inter-sheet gap 102. When the interconnection strip 11 of this shape is laminated, the stress distribution between the two edge interconnection strip connection parts 101a is relatively uniform.
[0044] Optionally, refer to Figure 6 , a height H1 of the middle protrusion 111 is greater than a height H2 of the protrusions 111 on both sides.
[0045] Specifically, if Figure 6 As shown, when there are three protrusions 111, the height of the middle protrusion 111 is H1, and the height of the protrusions 111 on both sides is H2, and H1 can be greater than H2, so that more overflow glue can be accommodated at the position of the middle protrusion 111. It should be noted that the height of the protrusion 111 is the vertical distance between the transition position between the protrusion 111 and the main body of the interconnection strip 11 and the highest point of the protrusion 111.
[0046] Optionally, refer to Figure 3 or Figure 4 The distance between the protrusions 111 on both sides and the edge interconnection strip connecting portion 101a located on the same side is L, 3mm≤L≤6.4mm.
[0047] Specifically, if Figure 3 or Figure 4 As shown, the distance between the protrusion 111 on the left and the edge interconnection strip connection part 101a on the left is L, and the distance between the protrusion 111 on the right and the edge interconnection strip connection part 101a on the right is L. When L is too small (for example, less than 3mm), the protrusion 111 is too close to the edge interconnection strip connection part 101a, and the protrusion 111 is easily damaged when interconnecting by welding or other methods. When L is too large (for example, greater than 6.4mm), the protrusion 111 is too far from the edge interconnection strip connection part 101a, and a longer interconnection strip 11 needs to be reserved, which increases the cost of the interconnection strip 11. Therefore, 3mm≤L≤6.4mm, L can be 3mm,
[0048] 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm or 6.4 mm, etc. It should be noted that L may be the distance between the center of the protrusion 111 and the center of the edge interconnection strip connecting portion 101 a.
[0049] Optionally, refer to Figure 3 or Figure 4 The distance between the two edge interconnection strip connection parts 101a on both sides of the inter-sheet gap 102 is D1, 12.5mm≤D1≤13.5mm.
[0050] Specifically, if Figure 3 or Figure 4 As shown, the spacing between the two edge interconnection strip connection parts 101a on both sides of the inter-sheet gap 102 is D1, and D1 can be the distance between the centers of the two edge interconnection strip connection parts 101a. When D1 is too small (for example, less than 12.5mm), the operation accuracy is required to be high when interconnecting by welding or the like, and the process is difficult. When D1 is too large (for example, greater than 13.5mm), when interconnecting by welding or the like, the length of the interconnection strip 11 suspended in the interval is long, and the interconnection strip 11 is not stable and reliable enough. Therefore, 12.5mm≤D1≤13.5mm, L can be 12.5mm, 12.6mm, 12.7mm, 12.8mm, 12.9mm, 13.0mm, 13.1mm, 13.2mm, 13.3mm, 13.4mm or 13.5mm, etc.
[0051] Optionally, the length between the two edge interconnection bar connection portions 101 a of the interconnection bar 11 located on both sides of the inter-sheet gap 102 is D2, and 14 mm≤D2≤15.5 mm.
[0052] Specifically, the length between the two edge interconnection bar connecting parts 101a of the interconnection bar 11 on both sides of the inter-sheet gap 102 is D2 (not shown in the figure), and D2 is the size measured after the protrusion 111 in the middle is stretched and flattened with the center of the two edge interconnection bar connecting parts 101a as the measurement reference point. When D2 is too small (for example, less than 14mm), the protrusion 111 formed is small and insufficient to offset the displacement of the warping deformation of the battery cell. When D2 is too large (for example, greater than 15.5mm), a longer interconnection bar 11 needs to be reserved, and the cost of the interconnection bar 11 increases. Therefore, 14mm≤D2≤15.5mm, and L can be 14mm, 14.1mm, 14.2mm, 14.3mm, 14.4mm, 14.5mm, 14.6mm, 14.7mm, 14.8mm, 14.9mm, 15.0mm, 15.1mm, 15.2mm, 15.3mm, 15.4mm or 15.5mm, etc.
[0053] Optionally, 0.6≤D1 / D2≤0.85.
[0054] Specifically, combined with the description of the above embodiments, it can be seen that D1 is less than D2, so D1 / D2 is less than 1. However, when D1 / D2 is too small (for example, less than 0.6), the risk of parallel connection in the battery string will increase. When D1 / D2 is too large (for example, greater than 0.85), the consumption of interconnection bars is high, which will lead to an increase in the cost of interconnection bars. Therefore, 0.6≤D1 / D2≤0.85 can reduce the risk of parallel connection and the cost of interconnection bars. For example, D1 / D2 can be 0.6, 0.65, 0.7, 0.75, 0.8 or 0.85, etc.
[0055] Optionally, refer to Figure 2 The width of the inter-sheet gap 102 is D3, 0.5 mm ≤ D3 ≤ 2 mm.
[0056] Specifically, specifically, Figure 2 As shown in the figure, the width of the inter-sheet gap 102 between two adjacent back contact cells 10 is D3. When D3 is too small (for example, less than 0.5 mm), the arrangement accuracy of the cells is required to be high, and the process is difficult. When D3 is too large (for example, greater than 2 mm), the inter-sheet gap 102 in the formed cell string is large, and the area of the manufactured photovoltaic module is wasted. Therefore, in the embodiment of the utility model, 0.5 mm ≤ D3 ≤ 2 mm, D3 can be 0.5 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.2 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm or 2 mm, etc.
[0057] Optionally, the number of the protrusions 111 is negatively correlated with the thickness of the interconnection bar 11 .
[0058] Specifically, in one embodiment, when the thickness of the interconnection bar 11 is relatively thick, it is not easy to cause the battery cell to warp, and accordingly, at this time, the number of protrusions 111 can be relatively small. On the contrary, when the thickness of the interconnection bar 11 is relatively thin, the risk of warping and deformation of the battery cell is relatively large, and accordingly, providing a larger number of protrusions 111 can more easily offset the displacement of the warping and deformation of the battery cell.
[0059] An embodiment of the utility model further provides a photovoltaic assembly, which includes any one of the aforementioned battery strings.
[0060] In the embodiment of the utility model, by laminating and packaging the battery string provided in the above-mentioned embodiment with the cover glass and the back plate, a photovoltaic module with a higher product quality yield can be obtained.
[0061] Optionally, the photovoltaic module is a single-glass module, and a portion of the back plate of the single-glass module corresponding to the protrusion 111 has a convex mark.
[0062] In one embodiment, the above-mentioned photovoltaic module can be a single-glass module with an opaque backplane. The backplane thickness of the single-glass module is less than 0.3 mm, and the thickest generally does not exceed 0.32 mm. Therefore, after lamination, the glue of the adhesive film overflows into the space of the protrusion 111, and a convex mark can be formed on the surface of the backplane at the position corresponding to the protrusion 111. The convex mark is consistent with the position of the protrusion 111, allowing workers to visually check whether the protrusion 111 at the corresponding position has accommodated the overflowed glue.
[0063] The embodiment of the utility model further provides a photovoltaic system, which can use multiple photovoltaic modules as introduced in the above embodiments. Multiple photovoltaic modules can be installed on the roof of a building to form a distributed photovoltaic power generation system.
[0064] Specifically, the photovoltaic modules can be fixed to the building by using adhesive with strong adhesion and excellent weather resistance, or by using connectors such as a pressing block assembly used in conjunction with the photovoltaic module frame, or by using a hanger fastener used in conjunction with the photovoltaic module frame to mount the photovoltaic module on the wall of the building. The appropriate installation structure can be selected according to the actual construction conditions.
[0065] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.
[0066] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, which all fall within the protection of the utility model.
Claims
1. A battery string, characterized in that: The battery string comprises: A plurality of back-contact battery sheets, each of which has a plurality of interconnection bar connection portions spaced apart along a first direction on a surface of the back-contact battery sheet, the plurality of interconnection bar connection portions including edge interconnection bar connection portions located at two ends of the first direction; A plurality of interconnecting bars, wherein the interconnecting bars are electrically connected to the interconnecting bar connecting portion, and the interconnecting bars span the inter-sheet gap between two adjacent back-contact battery sheets to interconnect the plurality of back-contact battery sheets together along a first direction; At least two protrusions are provided at a portion of the interconnection bar between two edge interconnection bar connection portions on both sides of the inter-sheet gap.
2. The battery string according to claim 1, characterized in that: The number of the protrusions is two, a recessed portion is formed between the two protrusions, and the recessed portion is located in the area where the inter-sheet gap is located.
3. The battery string according to claim 1, characterized in that: The number of the protrusions is three, and the middle protrusion is located in the area where the inter-sheet gap is located.
4. The battery string according to claim 3, characterized in that: The height of the protrusion in the middle is greater than the heights of the protrusions on both sides.
5. The battery string according to claim 3, characterized in that: The distance between the protrusions on both sides and the connecting portion of the edge interconnection strip on the same side is L, 3mm≤L≤6.4mm.
6. The battery string according to any one of claims 1 to 5, characterized in that: The distance between the two edge interconnection strip connection parts on both sides of the inter-sheet gap is D1, 12.5 mm≤D1≤13.5 mm; and / or, The length of the interconnection bar between the two edge interconnection bar connection portions located on both sides of the inter-sheet gap is D2, and 14 mm ≤ D2 ≤ 15.5 mm.
7. The battery string according to claim 6, characterized in that: 0.6≤D1 / D2≤0.
85.
8. The battery string according to any one of claims 1 to 5, characterized in that: The width of the gap between the sheets is D3, 0.5mm≤D3≤2mm.
9. The battery string according to any one of claims 1 to 5, characterized in that: The number of the protrusions is negatively correlated with the thickness of the interconnection strip.
10. A photovoltaic module, characterized in that: The photovoltaic module comprises the battery string according to any one of claims 1 to 9.
11. The photovoltaic module according to claim 10, characterized in that: The photovoltaic module is a single-glass module, and a convex mark is provided on a back plate of the single-glass module at a position corresponding to the protrusion.
12. A photovoltaic system, characterized in that: The photovoltaic system comprises the photovoltaic assembly according to claim 10 or 11.