Solar cell module with hidden cell gaps

Abstract

The utility model discloses a solar cell module with hidden cell gaps, comprising a plurality of cells and a first shielding strip, the back surfaces of the cells are electrically connected through conductive members, the conductive members are arranged along a first direction, a first gap is arranged between adjacent cells, the first gap is arranged along a second direction, and the first shielding strip is arranged on the second direction. The conductive part penetrates through the first gap along the first direction, the first shielding strip is arranged on the back surface of the battery piece along the second direction and stretches across two adjacent battery pieces, and the conductive part is arranged on one side, far away from the front surface of the battery piece, of the first shielding strip; the first shielding strip can cover the first gap to shield the conductive part, and the first shielding strip is provided with a bonding layer, a reflecting layer and a reinforcing layer. According to the utility model, the gaps between the battery pieces can be hidden, the electric connection mechanism is hidden, and the consistency of the front color can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of solar cells, in particular to a solar cell assembly with hidden cell gaps. Background Art

[0002] Back-contact solar cell modules typically include the following layered structures from the front to the back: a front plate layer, a front film layer, a battery pack layer, a back film layer, and a back plate layer. The battery pack layer includes multiple electrically connected battery strings, and the battery string is composed of multiple electrically connected battery cells. The battery cells are electrically connected via welding ribbons or other wires. Since there is a certain gap between adjacent battery cells, the existence of this gap will cause the electrical connection mechanisms such as welding ribbons / wires to be exposed on the front of the battery, making the overall appearance of the front poor. In addition, since the front of the battery cell is usually dark blue or black, while the electrical connection structures such as welding ribbons / wires are usually silver-white, the color difference between the two is large, which can easily cause a noticeable color jump on the front of the module, resulting in inconsistent colors on the front, which in turn affects the appearance of the front of the battery module. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide a solar cell assembly with hidden cell gaps, which can hide the gaps between the cells, thereby hiding the electrical connection mechanism and improving the consistency of the front color.

[0004] In order to solve the above technical problems, the utility model provides a solar cell assembly with hidden gaps between cell panels, comprising a plurality of cell panels, the back sides of the cell panels being electrically connected via conductive members, the conductive members being arranged along a first direction, a first gap being provided between adjacent cell panels, the first gap being arranged along a second direction, the conductive member passing through the first gap along the first direction, and the first direction and the second direction being perpendicular to each other.

[0005] It also includes a first shielding strip, which is arranged on the back side of the battery cell along the second direction and spans between two adjacent battery cells. The conductive member is arranged on the side of the first shielding strip away from the front side of the battery cell. The portion of the conductive member located in the first gap can abut against the first shielding strip, and the first shielding strip can cover the first gap to shield the conductive member.

[0006] As an improvement to the above solution, the first shielding strip is provided with an adhesive layer, and the adhesive layer overlaps and forms an adhesion with the back edge of the battery cell, and the overlapping width is not less than 0.5 mm.

[0007] As an improvement to the above solution, the first shielding strip is further provided with a reflective layer, and the reflective layer is provided on a side of the adhesive layer away from the front surface of the battery cell.

[0008] As an improvement to the above solution, the reflectivity of the reflective layer to AM1.5G sunlight within the range of 700-1200nm is greater than 20%.

[0009] As an improvement to the above solution, the first shielding strip is further provided with a reinforcement layer, which is provided on a side of the reflective layer away from the adhesive layer, and the conductive member can abut against the reinforcement layer.

[0010] As an improvement to the above solution, the thickness of the reflective layer is smaller than the thickness of the reinforcement layer, and the thickness of the reinforcement layer is smaller than the thickness of the adhesive layer.

[0011] As an improvement to the above solution, the number of the first shielding strips corresponds to the number of the first gaps, and the length of the first shielding strip is not less than the length of a single battery cell in the second direction.

[0012] As an improvement to the above solution, the first shielding strip can simultaneously cover a plurality of the first gaps arranged along the same second direction.

[0013] As an improvement to the above solution, the thickness of the first shielding strip is in the range of 25-550 μm.

[0014] As an improvement to the above scheme, a second shielding strip is further included. The battery cell at the head end of the first direction is the head end battery cell, and a first edge is provided on the side of the head end battery cell away from the first shielding strip. The battery cell at the end of the first direction is the end battery cell, and a second edge is provided on the side of the end battery cell away from the first shielding strip. The second shielding strips respectively cover the first edge and the second edge to shield the conductive parts extending from the first edge and the second edge.

[0015] As an improvement to the above solution, the side portions of the second shielding strip overlap and bond with the first edge and the second edge, and the overlapping width is not less than 1 mm.

[0016] The implementation of this utility model has the following beneficial effects:

[0017] The solar cell assembly with hidden cell gaps of the present invention is provided with a plurality of cell slices, and the plurality of cell slices can be connected into a cell string through a conductive member, and a first gap is provided between adjacent cell slices, and one end of the conductive member can extend into the first gap to be electrically connected to the adjacent cell slice. In order to be able to shield the first gap and the first conductive member, the solar cell assembly with hidden cell gaps of the present invention is also provided with a first shielding strip, and the conductive member is provided on the side of the first shielding strip away from the front of the cell, and the first shielding strip can cover the first gap to shield the conductive member. Therefore, on the front, the first shielding strip can shield the first gap and the conductive member, thereby achieving the effect of shielding the gap and hiding the electrical connection structure, and after shielding the gap, the front of the first shielding strip can be set to a color that is the same as or similar to the color of the front of the cell, thereby avoiding the formation of obvious color jumps and improving the consistency of the front color. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the front structure of a solar cell assembly with hidden cell gaps according to the present invention;

[0019] Figure 2 This is a schematic diagram of the back structure of a solar cell module with hidden cell gaps according to the present invention;

[0020] Figure 3 This is a schematic cross-sectional view of a first embodiment of a solar cell assembly with hidden cell gaps according to the present invention;

[0021] Figure 4 This is a schematic cross-sectional view of a second embodiment of a solar cell assembly with hidden cell gaps according to the present invention;

[0022] Figure 5 This is a schematic cross-sectional view of a third embodiment of a solar cell assembly with hidden cell gaps according to the present invention;

[0023] Figure 6 This is a schematic cross-sectional view of a fourth embodiment of a solar cell assembly with hidden cell gaps according to the present invention;

[0024] Figure 7 This is a schematic structural diagram of a fifth embodiment of a solar cell assembly with hidden cell gaps according to the present invention;

[0025] Figure 8 This is a schematic structural diagram of a sixth embodiment of a solar cell assembly with hidden cell gaps according to the present invention;

[0026] Figure 9It is a structural schematic diagram of the seventh embodiment of the solar cell assembly with hidden cell gaps of the utility model. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that any directional terms such as "up," "down," "left," "right," "front," "back," "inside," and "outside" that appear or will appear in this document are based solely on the accompanying drawings and are not intended to limit the present invention.

[0028] See also Figure 1 and Figure 2 , an embodiment of the present utility model discloses a solar cell module with hidden gaps between battery cells 1, comprising a plurality of battery cells 1, the back sides of the battery cells 1 being electrically connected via a conductive member 2, the conductive member 2 being a wire having a certain thickness and length such as a welding ribbon, the conductive member 2 being arranged along a first direction, a first gap 3 being provided between adjacent battery cells 1, the first gap 3 being arranged along a second direction, the first direction and the second direction being perpendicular to each other, the first gap 3 and the arrangement direction of the conductive member 2 being perpendicular to each other, so that when the conductive member 2 connects two adjacent battery cells 1, the conductive member 2 will pass through the first gap 3 along the first direction, and when observed from the front side of the battery cell 1 (the light-receiving side of the battery cell 1), part of the conductive member 2 will be exposed in the first gap 3.

[0029] In order to be able to shield the conductive member 2 exposed in the first gap 3 and improve the consistency of the appearance of the front side of the solar cell assembly, the solar cell assembly that hides the gap between the cell 1 also includes a first shielding strip 4, which is arranged on the back side of the cell 1 along the second direction and spans between two adjacent cell cells 1. The first shielding strip 4 can be arranged along the first gap 3, and the first shielding strip 4 spans between two adjacent cell cells 1, so that the first gap 3 can be covered. The conductive member 2 is arranged on the side of the first shielding strip 4 away from the front side of the cell 1, that is, on the back side of the cell 1, and the first shielding strip 4 can cover the first gap 3 to shield the conductive member 2, so that the first gap 3 and the conductive member 2 can be shielded. By setting the front side of the first shielding strip 4 to the same or similar color as the front color of the cell 1, obvious color jumps can be avoided, and the consistency of the front color can be improved. In addition, the portion of the conductive part 2 located in the first gap 3 can abut against the first shielding strip 4. Before string welding, the first shielding strip 4 is first placed in the first gap 3, and then the conductive part 2 is placed. Part of the conductive part 2 abuts against the first shielding strip 4. The first shielding strip 4 can form a certain pre-positioning effect on the conductive part 2. Therefore, during string welding, the conductive part 2 can be prevented from being offset, misaligned, etc. to a certain extent.

[0030] The beneficial effects of the embodiments of the present utility model are as follows:

[0031] The solar cell assembly with hidden gaps between the cells 1 according to the embodiment of the present invention is provided with a plurality of cells 1, and the plurality of cells 1 can be connected into a cell string through a conductive member 2, and a first gap 3 is provided between adjacent cells 1, and one end of the conductive member 2 can extend into the first gap 3 to be electrically connected to the adjacent cell 1. In order to be able to shield the first gap 3 and the first conductive member 2, the solar cell assembly with hidden gaps between the cells 1 according to the present invention is also provided with a first shielding strip 4, and the conductive member 2 is provided on the side of the first shielding strip 4 away from the front of the cell 1, and the first shielding strip 4 can cover the first gap 3 to shield the conductive member 2, so that on the front, the first shielding strip 4 can shield the first gap 3 and the conductive member 2, thereby achieving the effect of shielding the gap and hiding the electrical connection structure, and after shielding the gap, the front of the first shielding strip 4 can be set to a color that is the same as or similar to the color of the front of the cell 1, thereby avoiding the formation of obvious color jumps and improving the consistency of the front color.

[0032] Specifically, the first shielding strip 4 is provided with an adhesive layer 41, and the adhesive layer 41 overlaps with the back edge of the battery cell 1 and forms an adhesive bond. By setting the first shielding strip 4 on the back of the battery cell 1, it is possible to avoid blocking light on the front side of the battery cell 1.

[0033] See also Figure 3 In the first embodiment, the adhesive layer 41 is provided on the entire side surface of the first shielding strip 4 , and the edge of the adhesive layer 41 is overlapped and bonded with the edge of the first shielding strip 4 .

[0034] See also Figure 4 In the second embodiment, the adhesive layer 41 is provided on two edges of the same side of the first shielding strip 4 , specifically overlapping and adhering to the edge of the battery cell 1 .

[0035] In one embodiment, the width of the overlap between the adhesive layer 41 and the edge of the battery cell 1 is not less than 0.5 mm. When the overlap width is less than 0.5 mm, the contact area between the adhesive layer 41 and the battery cell 1 is small, and the connection stability cannot be guaranteed.

[0036] See also Figure 5 In the third embodiment, the adhesive layer 41 is a transparent layer, and the first shielding strip 4 is further provided with a reflective layer 42. The reflective layer 42 is provided on the side of the adhesive layer 41 away from the front surface of the battery cell 1. Since the first shielding strip 4 is provided on the back surface of the battery cell 1, the adhesive layer 41 is directly connected to the back surface of the battery cell 1. When the reflective layer 42 is provided on the side of the adhesive layer 41 away from the front surface of the battery cell 1, the light entering the gap between the battery cells 1 will pass through the transparent adhesive layer 41 to reach the reflective layer 42, and then be reflected by the reflective layer 42, so that the light can return to the front surface of the battery cell 1, thereby improving the utilization rate of the light.

[0037] The reflective layer 42 has a reflectivity of no less than 20% for AM1.5G sunlight within the wavelength range of 700-1200 nm, thereby increasing the photovoltaic material's absorption of light within the wavelength range and enhancing the light conversion efficiency. Furthermore, the thickness of the adhesive layer 41 is no less than that of the reinforcement layer 43 to provide a better connection with the cell 1. Appropriately thinning the reinforcement layer 43 can also save material for the reinforcement layer 43.

[0038] See also Figure 6Furthermore, in the fourth embodiment, the first shielding strip 4 is further provided with a reinforcement layer 43, and the reinforcement layer 43 is provided on the side of the reflective layer 42 away from the adhesive layer 41, and the conductive member 2 can abut against the reinforcement layer 43. The reinforcement layer 43 can improve the overall strength of the first shielding strip 4, that is, it can ensure that the adhesive layer 41 can be stably fixed on the battery cell 1, and can also ensure that the first shielding strip 4 has a certain strength, so that when the conductive member 2 is pre-positioned, it can play the effect of fixing the conductive member 2. The reinforcement layer 43 is made of one or more materials selected from PET, PI, EVA, POE, PVB, and PA12, and can form a layer structure with higher hardness. The thickness of the adhesive layer 41 is not less than the thickness of the reinforcement layer 43, so as to provide a better connection effect with the battery cell 1, and appropriately thinning the thickness of the reinforcement layer 43 can save the material of the reinforcement layer 43. The reflective layer 42 does not play a supporting and fixing role and can be a thin reflective coating or paint. The thickness of the reinforcement layer 43 is greater than that of the reflective layer 42 .

[0039] The thickness of the first shielding strip 4 ranges from 25 to 550 μm. When the thickness of the first shielding strip 4 is less than 25 μm, the adhesive layer 41 and the reinforcement layer 43 are relatively thin and cannot provide stable connection and fixation. When the thickness of the first shielding strip 4 is greater than 550 μm, it affects the overall thickness of the entire solar cell and wastes materials.

[0040] See also Figure 7 In the fifth embodiment, the number of the first shielding strips 4 is multiple and corresponds to the number of the first gaps 3, and can individually shield each first gap 3 and the conductive parts 2 exposed inside and outside the first gap 3, wherein the length of the first shielding strip 4 is not less than the length of a single battery cell 1 in the second direction, so that the first shielding strip 4 can completely cover the first gap 3 in the second direction.

[0041] See also Figure 8 In the sixth embodiment, there are multiple first shielding strips 4, but each of the first shielding strips 4 can simultaneously cover multiple first gaps 3 arranged along the same second direction, and the length of the first shielding strip 4 is greater than the length of the multiple battery cells 1 in the second direction, so that the first shielding strip 4 can block and cover the first gaps 3 in the same column or row.

[0042] See also Figure 9, the edge positions of the solar cell assembly still need to collect current, so the edge positions also have gaps. In the seventh embodiment, the solar cell assembly that hides the gaps between the cells 1 further includes a second shielding strip 5, which is capable of shielding the gaps at the edges of the solar cell assembly. Specifically, the cell 1 at the head end of the first direction is the head end cell 11, and the side of the head end cell 11 away from the first shielding strip 4 is provided with a first edge 111. The cell 1 at the end of the first direction is the end cell 12, and the side of the end cell 12 away from the first shielding strip 4 is provided with a second edge 121. The head end cell 11 and the end cell 12 are the cells 1 located at the two side edges of the solar cell assembly, respectively. Since current still needs to be collected at these positions, a certain gap is still left at the edges of the head end cell 11 and the end cell 12. In order to improve the integrity and aesthetics of the front appearance, the second shielding strip 5 covers the first edge 111 and the second edge 121 respectively to shield the conductive members 2 extending from the first edge 111 and the second edge 121. Furthermore, the side portions of the second shielding strip 5 overlap and bond with the first edge 111 and the second edge 121 , and the overlapping width is no less than 1 mm.

[0043] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A solar cell module with hidden cell gaps, characterized in that: The device comprises a plurality of battery cells, the back surfaces of the battery cells being electrically connected via a conductive member, the conductive member being arranged along a first direction, a first gap being provided between adjacent battery cells, the first gap being arranged along a second direction, the conductive member passing through the first gap along the first direction, and the first direction and the second direction being perpendicular to each other; It also includes a first shielding strip, which is arranged on the back side of the battery cell along the second direction and spans between two adjacent battery cells. The conductive member is arranged on the side of the first shielding strip away from the front side of the battery cell. The portion of the conductive member located in the first gap can abut against the first shielding strip, and the first shielding strip can cover the first gap to shield the conductive member.

2. The solar cell assembly with hidden cell gaps according to claim 1, characterized in that: The first shielding strip is provided with an adhesive layer, and the adhesive layer overlaps and forms an adhesion with the back edge of the battery cell, and the overlapping width is not less than 0.5 mm.

3. The solar cell assembly with hidden cell gaps according to claim 2, characterized in that: The first shielding strip is further provided with a reflective layer, and the reflective layer is provided on a side of the adhesive layer away from the front surface of the battery cell.

4. The solar cell assembly with hidden cell gaps according to claim 3, characterized in that: The reflectivity of the reflective layer to AM1.5G sunlight within the range of 700-1200nm is greater than 20%.

5. The solar cell assembly with hidden cell gaps according to claim 3, characterized in that: The first shielding strip is further provided with a reinforcement layer, which is provided on a side of the reflective layer away from the adhesive layer, and the conductive member can abut against the reinforcement layer.

6. The solar cell assembly with hidden cell gaps according to claim 5, characterized in that: The thickness of the reflective layer is smaller than that of the reinforcement layer, and the thickness of the reinforcement layer is smaller than that of the adhesive layer.

7. The solar cell assembly with hidden cell gaps according to claim 1, characterized in that: The number of the first shielding strips corresponds to the number of the first gaps, and the length of the first shielding strip is not less than the length of a single battery cell in the second direction.

8. The solar cell assembly with hidden cell gaps according to claim 1, characterized in that: The first shielding strip can simultaneously cover a plurality of the first gaps arranged along the same second direction.

9. The solar cell assembly with hidden cell gaps according to claim 1, characterized in that: The thickness of the first shielding strip is in the range of 25-550 μm.

10. The solar cell assembly with hidden cell gaps according to claim 1, characterized in that: It also includes a second shielding strip, the battery cell at the head end of the first direction is the head end battery cell, and the side of the head end battery cell away from the first shielding strip is provided with a first edge, the battery cell at the end of the first direction is the end battery cell, and the side of the end battery cell away from the first shielding strip is provided with a second edge, and the second shielding strips respectively cover the first edge and the second edge to shield the conductive parts extending from the first edge and the second edge.

11. The solar cell assembly with hidden cell gaps according to claim 10, characterized in that: The side portions of the second shielding strip overlap and bond with the first edge and the second edge, and the overlapping width is no less than 1 mm.

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