Shielding fixing strip for solar cell and solar cell
By using shading fixing strips in solar cell modules, the problems of inconsistent appearance and warping caused by gaps between cells were solved, resulting in higher cell connection strength and light utilization.
Patent Information
- Application Number
- CN202422243295.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-09-12
AI Technical Summary
In existing solar cell modules, gaps between cells result in exposed solder ribbons/wires, affecting appearance consistency and easily causing cell warping or deformation, thus impacting yield and efficiency.
The system employs a shielding and fixing strip, which includes a fixing layer and a skeleton layer. The fixing layer spans between adjacent solar cells, while the skeleton layer covers the edges of the solar cells and has high rigidity. It is used to shield the gaps and provide support to prevent warping.
It improves the appearance consistency of solar cell modules, prevents cell warping or deformation, and enhances cell yield and efficiency.
Smart Images
Figure CN223503294U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of solar cell technology, and in particular to a shading and fixing strip for solar cells and a solar cell. Background Technology
[0002] Back-contact solar cell modules typically consist of the following layered structure from front to back: front panel layer, front film layer, cell pack layer, back film layer, and backsheet. The cell pack layer includes multiple electrically connected cell strings, each composed of multiple interconnected solar cells. Cells and cell strings are electrically connected via solder ribbons / wires or busbars. Because there are gaps between cells and cell strings, these connections (solder ribbons / wires, busbars, etc.) are exposed on the front of the cells. Since the front of the cells is usually dark blue or black, while the solder ribbons / wires and busbars are usually silver-white, the significant color difference can create noticeable color contrasts on the front of the module, affecting the uniformity of the module's appearance. Furthermore, because the solder ribbons / wires and busbars between cells do not provide adequate support, the heat generated during string welding can cause warping of the cells. Uneven lighting during long-term use can also lead to warping or deformation, impacting cell yield and efficiency. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a shading and fixing strip for solar cells, which can block the gaps between the cells, ensure the consistency of the front appearance, and prevent the cells from warping or deforming, thereby improving yield and efficiency.
[0004] To solve the above-mentioned technical problems, this utility model provides a shading and fixing strip for solar cells. The solar cell includes a battery pack layer, the battery pack layer includes multiple battery cells, the multiple battery cells are distributed at intervals along a first direction and a second direction, the shading and fixing strip for solar cells is arranged along the first direction and / or the second direction, the shading and fixing strip for solar cells includes a fixing layer and a skeleton layer, the skeleton layer and the fixing layer are stacked, and the first direction and the second direction are perpendicular to each other.
[0005] The fixing layer spans between adjacent battery cells, and the two sides of the skeleton layer span between the edges of two adjacent battery cells. The skeleton layer can cover the gap between adjacent battery cells, and the Shore hardness of the skeleton layer is between D30 and D100.
[0006] As an improvement to the above solution, the width of the fixing layer is not less than the width of the skeleton layer, and the width of the skeleton layer is greater than the width of the gap between adjacent battery cells.
[0007] As an improvement to the above solution, the side of the fixing layer overlaps with the edge of the battery cell, and the overlap width is not less than 0.5 mm.
[0008] As an improvement to the above solution, the projection of the skeleton layer on the plane of the battery cell overlaps with the edge of the battery cell, and the overlap width is not less than 0.2 mm.
[0009] As an improvement to the above scheme, the thickness of the fixing layer is not less than the thickness of the skeleton layer, and the total thickness of the fixing layer and the skeleton layer ranges from 20 to 500 μm.
[0010] As an improvement to the above scheme, the ratio of the thickness of the fixing layer to the thickness of the skeleton layer is in the range of 1.1:1 to 10:1.
[0011] As an improvement to the above solution, the shading and fixing strip for the solar cell further includes a reflective layer, which is disposed between the fixing layer and the frame layer, or on the side of the frame layer away from the fixing layer.
[0012] As an improvement to the above scheme, the reflective layer has a reflectivity of no less than 20% for AM1.5G sunlight in the wavelength range of 700-1200nm.
[0013] As an improvement to the above scheme, the thickness of the fixing layer is not less than the thickness of the skeleton layer, the thickness of the skeleton layer is greater than the thickness of the reflective layer, and the total thickness of the fixing layer, the skeleton layer and the reflective layer ranges from 25 to 550 μm.
[0014] As an improvement to the above solution, the skeleton layer is made of one or more materials selected from PET, PI, TPT, PVDF, PVF, PCTFE, PTFE, FEVE, EVA, PO, PE, PVB, and PA.
[0015] As an improvement to the above scheme, the Shore hardness of the skeleton layer is between D40 and D90.
[0016] This utility model also provides a solar cell, including the shading and fixing strip for the solar cell as described above.
[0017] Implementing this utility model has the following beneficial effects:
[0018] This utility model relates to a shading and fixing strip for solar cells, comprising a fixing layer and a skeleton layer. The fixing layer connects adjacent solar cells, and the skeleton layer spans across the edges of two adjacent solar cells on both sides. The skeleton layer can cover the gap between adjacent solar cells, thereby shading the gap between them. At the same time, the skeleton layer has a Shore hardness between D30 and D100, possessing high mechanical strength, and can play a good role in connecting and fixing adjacent solar cells. Therefore, after stringing or long-term use, it can prevent solar cells from warping or deforming, thereby improving yield and efficiency. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the structure of the shading and fixing strip of this utility model on the solar cell;
[0020] Figure 2 This is a cross-sectional structural schematic diagram of the first embodiment of the shading and fixing strip for solar cells according to this utility model;
[0021] Figure 3 This is a cross-sectional structural schematic diagram of the second embodiment of the shading and fixing strip for solar cells according to this utility model;
[0022] Figure 4 This is a cross-sectional structural schematic diagram of the third embodiment of the shading and fixing strip for solar cells according to the present invention. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will describe this utility model in further detail with reference to the accompanying drawings. It is hereby declared that the terms "up," "down," "left," "right," "front," "back," "inner," and "outer," etc., appearing or about to appear in this document, are based solely on the accompanying drawings and are not intended to specifically limit this utility model.
[0024] See Figure 1This utility model discloses a shading and fixing strip 10 for solar cells. The solar cell includes a battery pack layer 4, which includes multiple battery cells 41. Since connection circuits and bus circuits need to be set between the battery cells 41, the multiple battery cells 41 are distributed at intervals along a first direction and a second direction. There are certain gaps between adjacent battery cells 41 or between battery strings formed by the battery cells 41. The connection circuits and bus circuits can be set between the gaps of adjacent battery cells 41, so that the connection circuits and bus circuits are exposed on the front of the battery. In order to shade these gaps and hide the gaps and circuits, the shading and fixing strip 10 for solar cells is set along the first direction and / or the second direction. The shading and fixing strip 10 for solar cells can shade the circuit connection components such as solder strips and bus bars exposed in the gaps.
[0025] See Figure 2 The shading and fixing strip 10 for solar cells includes a fixing layer 1 and a frame layer 2. The fixing layer 1 is connected to the solar cell 41, and the frame layer 2 supports the fixing layer 1 and provides support for the solar cell 41 and the connection circuit between the solar cells 41. The fixing layer 1 is connected to the solar cell 41 to be fixed in the gap between adjacent solar cells 41 and adjacent solar cell strings. The frame layer 2 is stacked on top of the fixing layer 1. The first direction and the second direction are perpendicular to each other. The solar cells 41 can be connected to form a solar cell string along the first direction, and multiple solar cell strings can be distributed along the second direction to form a complete solar cell stack 4. Since the gaps between solar cells 41 and the gaps between solar cell strings are essentially the gaps between solar cells 41, for ease of description, the gaps between solar cells 41 and the gaps between solar cell strings are collectively referred to as the gaps 42 between solar cells 41.
[0026] In addition, the shading and fixing strip 10 for solar cells can also pre-fix the circuit connection components in the gap 42 and prevent the solar cells 41 from warping. Specifically, the fixing layer 1 spans between adjacent solar cells 41, and the two sides of the skeleton layer 2 span between the edges of two adjacent solar cells 41. In this way, the skeleton layer 2 can cover the gap 42 between adjacent solar cells 41. Moreover, the Shore hardness of the skeleton layer 2 is between D30 and D100, which has high hardness. On the one hand, before stringing, circuit connection components such as solder ribbons can be pre-fixed to the fixing layer 1 or the skeleton layer 2 to avoid the solder ribbons shifting during pressure welding. On the other hand, the two sides of the skeleton layer 2 span between the edges of two adjacent solar cells 41. Since the skeleton layer 2 has high hardness, it can provide a certain support for the edges of adjacent solar cells 41. In this way, after stringing or after long-term use, it is not easy to generate thermal stress concentration due to uneven surface temperature, thereby reducing the probability of warping or deformation.
[0027] The beneficial effects of this utility model embodiment are as follows:
[0028] This utility model embodiment of the shading and fixing strip 10 for solar cells includes a fixing layer 1 and a skeleton layer 2. The fixing layer 1 is connected between adjacent solar cells 41, and the two sides of the skeleton layer 2 span between the edges of two adjacent solar cells 41. The skeleton layer 2 can cover the gap between adjacent solar cells 41, thereby blocking the gap between adjacent solar cells 41. At the same time, the Shore hardness of the skeleton layer 2 is between D30 and D100, which has high mechanical strength and can play a good connection and fixing role between adjacent solar cells 41. Therefore, after string welding or long-term use, it can prevent solar cells 41 from warping, deforming and other phenomena, thereby improving yield and efficiency.
[0029] Specifically, see Figure 2In the first embodiment, the width of the fixing layer 1 is not less than the width of the skeleton layer 2, and the width of the skeleton layer 2 is greater than the width of the gap 42 between adjacent battery cells 41. The widths of the fixing layer 1 and the skeleton layer 2 refer to the span of the fixing layer 1 and the skeleton layer 2 in the second direction when they are arranged along the first direction, or the span of the fixing layer 1 and the skeleton layer 2 in the first direction when they are arranged along the second direction. The width of the skeleton layer 2 being greater than the width of the gap 42 between adjacent battery cells 41 ensures that the skeleton layer 2 can both shield the gap 42 between adjacent battery cells 41 and provide sufficient space for the connection circuits between adjacent battery cells 41. It also ensures that the skeleton layer 2 can connect the edges of two adjacent battery cells 41, thereby improving the connection strength between the two adjacent battery cells 41. The width of the fixing layer 1 is not less than the width of the skeleton layer 2, which ensures that the fixing layer 1 can have a large contact area with the edge of the battery cell 41, thereby improving the connection stability.
[0030] In one embodiment, the side of the fixing layer 1 overlaps with the edge of the battery cell 41, that is, the fixing layer 1 is directly connected to the edge of the battery cell 41, and the overlap width is not less than 0.5mm. When the overlap width is less than 0.5mm, the contact area between the fixing layer 1 and the battery cell 41 is small, and the connection stability cannot be guaranteed.
[0031] In one embodiment, the projection of the skeleton layer 2 onto the plane of the battery cell 41 overlaps with the edge of the battery cell 41. The skeleton layer 2 is not directly connected to the battery cell 41. The skeleton layer 2 is connected to the fixing layer 1, and the fixing layer 1 is connected to the battery cell 41. Therefore, when the skeleton layer 2 covers the gap 42 between two adjacent battery cells 41, the projection of the skeleton layer 2 onto the plane of the battery cell 41 overlaps with the edge of the battery cell 41, wherein the overlap width is not less than 0.2 mm. When the overlap width is less than 0.2 mm, the support strength provided by the skeleton layer 2 is weak, and it is not easy to achieve the effect of pre-fixing electrical connection components such as solder strips before stringing and improving the connection strength between two adjacent battery cells 41.
[0032] In one embodiment, the thickness of the fixing layer 1 is not less than the thickness of the skeleton layer 2 to provide a better connection with the battery cell 41. Furthermore, the skeleton layer 2 has high rigidity, and its thickness can be appropriately reduced to save material. The total thickness of the fixing layer 1 and the skeleton layer 2 ranges from 20 to 500 μm. When the total thickness of the fixing layer 1 and the skeleton layer 2 is less than 20 μm, they are too thin and cannot provide a stable connection and fixation. When the total thickness of the fixing layer 1 and the skeleton layer 2 is greater than 500 μm, it affects the overall thickness of the battery pack layer 4 and wastes material.
[0033] In one embodiment, the ratio of the thickness of the fixing layer 1 to the thickness of the skeleton layer 2 is in the range of 1.1:1 to 10:1, and the thickness of the fixing layer 1 is at least 1.1 times the thickness of the skeleton layer 2 and at most 10 times.
[0034] See Figure 3 In the second embodiment, the shading and fixing strip 10 for the solar cell further includes a reflective layer 3. The reflective layer 3 is disposed between the fixing layer 1 and the skeleton layer 2. When the shading and fixing strip 10 for the solar cell is connected to the back of the solar cell 41, the fixing layer 1 is directly connected to the back of the solar cell 41, while the skeleton layer 2 is disposed on the side away from the front of the solar cell 41. The reflective layer 3 is disposed between the fixing layer 1 and the skeleton layer 2. In this way, when the fixing layer 1 is made of a transparent material, the light entering the gap 42 between the solar cells 41 will pass through the fixing layer 1 to reach the reflective layer 3, and then be reflected out by the reflective layer 3, so that the light can return to the front of the solar cell 41, thereby improving the utilization rate of light.
[0035] See Figure 4 In the third embodiment, the reflective layer 3 is disposed on the side of the skeleton layer 2 away from the fixing layer 1. When the shading fixing strip 10 for the solar cell is connected to the front of the solar cell 41 or connected towards the front of the solar cell 41 (but not directly connected to the front of the solar cell 41), the fixing layer 1 faces towards the side closer to the back of the solar cell 41, and the reflective layer 3 needs to be disposed on the outermost side of the shading fixing strip 10 for the solar cell, that is, the side closer to the front of the solar cell 41. At this time, the skeleton layer 2 is disposed between the fixing layer 1 and the reflective layer 3, so that the light entering the gap 42 between the solar cells 41 will fall directly onto the reflective layer 3 without passing through the skeleton layer 2 and the fixing layer 1, which can achieve lower loss reflection and improve light utilization.
[0036] In the above embodiment, the reflective layer 3 has a reflectivity of no less than 20% for AM1.5G sunlight in the wavelength range of 700-1200nm, which can improve the absorption of light in the 700-1200nm wavelength range by photovoltaic materials and improve the light conversion effect. Furthermore, the thickness of the fixing layer 1 is no less than the thickness of the skeleton layer 2 to provide a better connection with the battery cell 41. Appropriately thinning the skeleton layer 2 can save material. The reflective layer 3 does not provide support or fixation and can be a thin reflective coating or paint. The thickness of the skeleton layer 2 is greater than the thickness of the reflective layer 3. The total thickness of the fixing layer 1, the skeleton layer 2, and the reflective layer 3 ranges from 25-550μm. When the total thickness of the fixing layer 1 and the skeleton layer 2 is less than 25μm, the fixing layer 1 and the skeleton layer 2 are too thin and cannot provide a stable connection and fixation. When the total thickness of the fixing layer 1 and the skeleton layer 2 is greater than 550μm, it affects the overall thickness of the battery pack layer 4 and wastes material.
[0037] The skeleton layer 2 is made of one or more materials selected from PET, PI, TPT, PVDF, PVF, PCTFE, PTFE, FEVE, EVA, PO, PE, PVB, and PA, which can form a layer structure with high hardness. In a preferred embodiment, the Shore hardness of the skeleton layer 2 is between D40 and D90. When the Shore hardness of the skeleton layer 2 is less than D40, it cannot play a good supporting and connecting role and the anti-warping effect is weak. When the Shore hardness of the skeleton layer 2 is greater than D90, the hardness of the skeleton layer 2 is too high and it is easy to damage the battery cell 41 during lamination.
[0038] This utility model embodiment also discloses a solar cell, including a shading and fixing strip 10 for the solar cell as described above. The shading and fixing strip 10 for the solar cell can block the gap 42 between each cell 41 in the solar cell. At the same time, the shading and fixing strip 10 for the solar cell includes a skeleton layer 2. The Shore hardness of the skeleton layer 2 is between D30 and D100. It can provide a pre-positioning effect for circuit connection components such as solder ribbons, and can also improve the connection strength between two adjacent cells 41, thus playing a role in preventing warping.
[0039] The above are preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.
Claims
1. A shading and fixing strip for a solar cell, the solar cell comprising a battery pack layer, the battery pack layer comprising a plurality of battery cells, the plurality of battery cells being spaced apart along a first direction and a second direction, characterized in that, The shading and fixing strip for the solar cell is arranged along the first direction and / or the second direction. The shading and fixing strip for the solar cell includes a fixing layer and a skeleton layer. The skeleton layer is stacked with the fixing layer. The first direction and the second direction are perpendicular to each other. The fixing layer spans between adjacent battery cells, and the two sides of the skeleton layer span between the edges of two adjacent battery cells. The skeleton layer can cover the gap between adjacent battery cells, and the Shore hardness of the skeleton layer is between D30 and D100.
2. The shading and fixing strip for solar cells according to claim 1, characterized in that, The width of the fixing layer is not less than the width of the skeleton layer, and the width of the skeleton layer is greater than the width of the gap between adjacent battery cells.
3. The shading and fixing strip for solar cells according to claim 1, characterized in that, The side of the fixing layer overlaps with the edge of the battery cell, and the overlap width is not less than 0.5 mm.
4. The shading and fixing strip for solar cells according to claim 1, characterized in that, The projection of the skeleton layer onto the plane of the battery cell overlaps with the edge of the battery cell, and the overlap width is not less than 0.2 mm.
5. The shading and fixing strip for solar cells according to claim 1, characterized in that, The thickness of the fixing layer is not less than the thickness of the skeleton layer, and the total thickness of the fixing layer and the skeleton layer ranges from 20 to 500 μm.
6. The shading and fixing strip for solar cells according to claim 1, characterized in that, The ratio of the thickness of the fixing layer to the thickness of the skeleton layer ranges from 1.1:1 to 10:
1.
7. The shading and fixing strip for solar cells according to claim 1, characterized in that, The shading and fixing strip for solar cells also includes a reflective layer, which is disposed between the fixing layer and the frame layer, or on the side of the frame layer away from the fixing layer.
8. The shading and fixing strip for solar cells according to claim 7, characterized in that, The reflective layer has a reflectivity of no less than 20% for AM1.5G sunlight in the wavelength range of 700-1200nm.
9. The shading and fixing strip for solar cells according to claim 7, characterized in that, The thickness of the fixing layer is not less than the thickness of the skeleton layer, the thickness of the skeleton layer is greater than the thickness of the reflective layer, and the total thickness of the fixing layer, the skeleton layer and the reflective layer ranges from 25 to 550 μm.
10. The shading and fixing strip for solar cells according to claim 1, characterized in that, The Shore hardness of the skeleton layer is between D40 and D90.
11. A solar cell, characterized in that, Includes the shading and fixing strip for solar cells as described in any one of claims 1-10.