Solar cell module with hidden cell string gaps

Abstract

The utility model discloses a solar cell module capable of hiding cell string gaps, which comprises cell sheets and a first shielding strip, the cell sheets are arranged along a first direction to form cell strings, and a plurality of cell strings are arranged along a second direction to form cell units; the adjacent battery units are electrically connected through first conductive parts, first gaps are formed between the adjacent battery units, the first conductive parts are arranged in the second direction and located in the first gaps, and the first shielding strips are arranged between the adjacent battery units in the second direction and located in the first gaps. The first shielding strip is located in the first gap and can cover the first conductive part to shield the first 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 strings can be shielded, and the electric connection mechanism can be hidden.

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 string gaps. Background Art

[0002] Back-contact solar cell modules typically consist of the following layered structures from front to back: a front sheet layer, a front film layer, a cell stack layer, a back film layer, and a back sheet. The cell stack layer includes multiple electrically connected cell strings, which are made up of multiple cells electrically connected via solder ribbons. The cell strings are connected by busbars. Since there are gaps between adjacent cell strings, these gaps expose the busbars on the front of the cells, compromising the overall appearance of the front. Furthermore, since the front of the cells is typically dark blue or black, while the busbars are typically silvery white, the color difference between the two is significant, creating a noticeable color jump on the front of the module, leading to inconsistent colors on the front, and thus affecting the appearance of the front of the module. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide a solar cell assembly that hides the gaps between battery strings, can shield the gaps between battery strings, and can hide the electrical connection mechanism.

[0004] In order to solve the above technical problems, the utility model provides a solar cell assembly with hidden battery string gaps, comprising a plurality of battery cells, wherein the battery cells are arranged along a first direction to form a battery string, and a plurality of the battery strings are arranged along a second direction to form battery cells; adjacent battery cells are electrically connected by a first conductive member, and a first gap is provided between adjacent battery cells, the first conductive member is arranged along the second direction and located in the first gap, and the first direction and the second direction are perpendicular to each other.

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

[0006] As an improvement to the above solution, the first shielding strip is provided with an adhesive layer, the span of the adhesive layer in the first direction is greater than the span of the first conductive member in the first direction, and the first conductive member can abut against the adhesive layer.

[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 back 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, and the reinforcement layer is provided between the reflective layer and the adhesive 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 the first gaps in the plurality of battery strings arranged along the 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, it also includes a second shielding strip and a second conductive member, the battery cell is provided with a head end battery cell on the head end in the first direction, and a first edge is provided on the side of the head end battery cell away from the first shielding strip, the battery cell is provided with an end battery cell on the end in the first direction, and a second edge is provided on the side of the end battery cell away from the first shielding strip, the second conductive member is arranged on the side of the first edge and the second edge along the second direction and is electrically connected to the battery cell, and the second shielding strips respectively cover the first edge and the second edge to shield the second conductive member.

[0015] The implementation of this utility model has the following beneficial effects:

[0016] The solar cell assembly with hidden battery string gaps of the present invention is provided with a plurality of battery cells, wherein the plurality of battery cells are connected into a battery string, and the plurality of battery strings are arranged to form battery units. A first gap is provided in adjacent battery units, and the first gap can be used to place a first conductive member, and the first conductive member is preferably a bus bar, and the first conductive member can connect adjacent battery units to form an integral circuit. In order to be able to shield the first gap and the first conductive member, the solar cell assembly with hidden battery string gaps of the present invention is further provided with a first shielding strip, and the first shielding strip is located on the side of the first conductive member close to the front of the battery cell and can cover the first conductive member in the first gap. Therefore, when observed from the front, the first gap and the first conductive member in the first gap will be shielded by the first shielding strip, thereby achieving the effect of shielding the gap and hiding the electrical connection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the partial structure of the front side of the solar cell assembly with hidden cell string gaps of the utility model;

[0018] Figure 2 This is a schematic diagram of the partial structure of the back side of a solar cell module with hidden cell string gaps according to the present invention;

[0019] Figure 3 This is a schematic diagram of the cross-sectional structure between the battery cell, the first conductive member and the first shielding strip of the utility model;

[0020] Figure 4 This is a structural diagram of the first embodiment of the first shielding strip of the utility model;

[0021] Figure 5 This is a structural diagram of the second embodiment of the first shielding strip of the utility model;

[0022] Figure 6 This is a schematic structural diagram of a third embodiment of a solar cell assembly with hidden cell string gaps according to the present invention;

[0023] Figure 7 This is a schematic structural diagram of a fourth embodiment of a solar cell assembly with hidden cell string gaps according to the present invention;

[0024] Figure 8 It is a structural schematic diagram of the fifth embodiment of the solar cell assembly with hidden cell string gaps of the present invention. DETAILED DESCRIPTION

[0025] 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.

[0026] See also Figure 1 and Figure 2 The embodiment of the present utility model discloses a solar cell assembly that hides the gap between battery strings 13, including a plurality of battery cells 131, wherein the battery cells 131 are arranged along a first direction and a second direction respectively, wherein the battery cells 131 are arranged along the first direction to form a battery string 13, and a plurality of the battery strings 13 are arranged along the second direction to form a battery cell 1. The current in the battery string 13 is collected by wires such as welding ribbons and eventually converged on the first conductive member 2, and the adjacent battery cells 1 are electrically connected through the first conductive member 2, and the circuits of the two adjacent battery cells 1 are converged into the first conductive member 2. In order to place the first conductive member 2, a first gap 3 is provided between adjacent battery cells 1, and the first conductive member 2 is arranged along the second direction and located within the first gap 3, and the first direction and the second direction are perpendicular to each other. When observed from the front side of the battery cell 131 (the light-receiving side of the battery cell 131), part of the first conductive member 2 will be exposed in the first gap 3.

[0027] In order to shield the first conductive member 2 exposed in the first gap 3 and improve the consistency of the appearance of the front face of the solar cell assembly, the solar cell assembly that hides the gaps between the battery strings 13 also includes a first shielding strip 4. The first shielding strip 4 is arranged between adjacent battery cells 1 along the second direction, wherein the first shielding strip 4 is arranged on the side of the first conductive member 2 close to the front face of the battery cell 131. Thus, when observed from the front face of the battery cell 131, the first shielding strip 4 is located within the first gap 3 and can cover the first conductive member 2 to shield the first conductive member 2. Moreover, by setting the front face of the first shielding strip 4 to the same or similar color as the front face of the battery cell 131, it is possible to avoid obvious color jumps and improve the color consistency of the front face of the battery assembly.

[0028] The beneficial effects of the embodiments of the present utility model are as follows:

[0029] The solar cell assembly for hiding the gap between the battery strings 13 in an embodiment of the present invention is provided with a plurality of battery cells 131, wherein the plurality of battery cells 131 are connected into a battery string 13, and the plurality of battery strings 13 are arranged to form a battery unit 1, and a first gap 3 is provided in adjacent battery units 1, wherein the first gap 3 can be used to place a first conductive member 2, and the first conductive member 2 is preferably a bus bar, and the first conductive member 2 can connect adjacent battery units 1 to form an integral circuit. In order to be able to shield the first gap 3 and the first conductive member 2, the solar cell assembly for hiding the gap between the battery strings 13 in the present invention is further provided with a first shielding strip 4, which is located on the side of the first conductive member 2 close to the front of the battery cell 131 and can cover the first conductive member 2 in the first gap 3. Therefore, when observed from the front, the first gap 3 and the first conductive member 2 in the first gap 3 will be shielded by the first shielding strip 4, thereby achieving the effect of shielding the gap and hiding the electrical connection structure.

[0030] Specifically, see Figure 3 The first shielding strip 4 is provided with an adhesive layer 41. The span of the adhesive layer 41 in the first direction is greater than the span of the first conductive member 2 in the first direction. That is, the width of the adhesive layer 41 in the first direction is greater than the width of the first conductive member 2 in the first direction. The adhesive layer 41 can both shield the first conductive member 2 and allow the first conductive member 2 to abut against the adhesive layer 41. The adhesive layer 41 can abut against the soldering ribbons 7 between adjacent battery cells 131. Before placing the soldering ribbon 7 for string welding, the first shielding strip 4 is placed first, and then the soldering ribbon 7 is placed to complete the string welding. The first shielding strip 4 can form a certain pre-positioning effect on the soldering ribbon 7. Therefore, during string welding, the soldering ribbon 7 can be prevented from being offset or misaligned to a certain extent. Then, within the first gap 3, the first conductive member 2 is welded to the soldering ribbon 7 extending from the two battery cells 1 to form a busbar. Then, the battery cell 131, the first shielding strip 4, the soldering ribbon 7, the first conductive member 2, the glass and the adhesive film are laminated. During the lamination process, the adhesive layer 41 of the first shielding strip 4 faces the side where the soldering ribbon 7 is located, that is, the side where the first conductive member 2 is located. Therefore, the adhesive layer 41 can form abutment with the first conductive member 2. After abutment, the first conductive member 2 is not easily offset under the abutment of the adhesive layer 41, thereby improving the fixing effect.

[0031] See also Figure 4In the first 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 back of the battery cell 131, that is, the reflective layer 42 is provided on the side close to the front of the battery cell 131. In this way, the light entering the gap between the battery cells 131 will pass through and directly fall on the reflective layer 42, and then be reflected by the reflective layer 42, so that the light can return to the front of the battery cell 131 without passing through the fixing layer, thereby achieving lower loss reflection and improving light utilization.

[0032] The reflectivity of the reflective layer 42 to AM1.5G sunlight in the wavelength range of 700-1200 nm is not less than 20%, which can improve the absorption of light in the wavelength range of 700-1200 nm by the photovoltaic material and enhance the light conversion effect.

[0033] See also Figure 5 In the second embodiment, the first shielding strip 4 is further provided with a reinforcement layer 43, which is disposed between the reflective layer 42 and the adhesive layer 41. The reinforcement layer 43 ensures that the first shielding strip 4 has a certain strength. Moreover, by disposing the reinforcement layer 43 between the reflective layer 42 and the adhesive layer 41, light can be reflected by the reflective layer 42 without passing through the skeleton layer and the fixing layer. The thickness of the adhesive layer 41 is not less than that of the reinforcement layer 43 to provide a better connection with the solar cell 131. Appropriately thinning the thickness of the reinforcement layer 43 can save material for the reinforcement layer 43. The reflective layer 42 does not serve a supporting and fixing function and can be a relatively thin reflective coating or paint. The thickness of the reinforcement layer 43 is greater than that of the reflective layer 42.

[0034] The solar cell assembly, which conceals the gaps between the battery strings 13, is equipped with multiple battery cells 1 and, therefore, multiple first gaps 3. In some common embodiments, the first gaps 3 are typically located in the middle of the solar cell assembly to converge the currents of all the battery strings 13. Typically, the multiple first gaps 3 are spaced apart along the length of the assembly.

[0035] See also Figure 6 In the third embodiment, a plurality of the first gaps 3 are arranged along the second direction, and the number of the first shielding strips 4 is multiple, the number of the first shielding strips 4 corresponds to the number of the first gaps 3, and the length of the first shielding strip 4 is not less than the length of a single battery cell 131 in the second direction to ensure that each of the first shielding strips 4 can shield each of the first gaps 3 to form an intermittent shielding structure.

[0036] See also Figure 7In the fourth embodiment, a plurality of the first gaps 3 are arranged along the second direction, and the first shielding strip 4 can simultaneously cover the first gaps 3 in the plurality of the battery strings 13 arranged along the second direction to form a single continuous shielding structure.

[0037] 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.

[0038] See also Figure 8 , current collection still needs to be performed at the edge position of each of the battery cells 1, so the edge position of the battery cell 1 also has a gap. In the fifth embodiment, the solar cell assembly that hides the gap of the battery string 13 also includes a second shielding bar 5 and a second conductive member 6. The battery cell 1 is provided with a first end battery cell 11 at the head end in the first direction, and a first edge 111 is provided on the side of the first end battery cell 11 away from the first shielding bar 4. The battery cell 1 is provided with an end battery cell 12 at the end in the first direction, and a second edge 121 is provided on the side of the end battery cell 12 away from the first shielding bar 4. The first end battery cell 11 The first and last cell 11 and the end cell 12 are cell 131 located at the side edges of different battery cells 1. For example, the first cell 11 is the cell 131 at the left edge of the first battery cell 1, and the end cell 12 is the cell 131 at the right edge of another adjacent battery cell. The second conductive member 6 is disposed along the second direction on the sides of the first edge 111 and the second edge 121 and is electrically connected to the battery cell 1 to converge the circuits at the edges. The second shielding strips 5 cover the first edge 111 and the second edge 121 respectively to shield the second conductive member 6. In conjunction with the first shielding strips 4, the gaps between the cell strings 13 in the entire solar cell and the edge gaps can be shielded.

[0039] 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 assembly with hidden cell string gaps, characterized in that: The battery cell comprises a plurality of battery cells, the battery cells are arranged along a first direction to form a battery string, and the plurality of battery strings are arranged along a second direction to form a battery cell; adjacent battery cells are electrically connected via a first conductive member, a first gap is provided between adjacent battery cells, the first conductive member is arranged along the second direction and located within the first gap, and the first direction and the second direction are perpendicular to each other; It also includes a first shielding strip, which is arranged between adjacent battery cells along the second direction. The first shielding strip is arranged on the side of the first conductive member close to the front of the battery cell. The first shielding strip is located in the first gap and can cover the first conductive member to shield the first conductive member.

2. The solar cell assembly with hidden cell string gaps according to claim 1, characterized in that: The first shielding strip is provided with an adhesive layer, the span of the adhesive layer in the first direction is greater than the span of the first conductive member in the first direction, and the first conductive member can abut against the adhesive layer.

3. The solar cell assembly with hidden cell string 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 back surface of the battery cell.

4. The solar cell assembly with hidden cell string 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 string gaps according to claim 3, characterized in that: The first shielding strip is further provided with a reinforcement layer, and the reinforcement layer is provided between the reflective layer and the adhesive layer.

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

9. The solar cell assembly with hidden cell string 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 string gaps according to claim 1, characterized in that: It also includes a second shielding strip and a second conductive member, the battery cell is provided with a first end battery cell on the head end in the first direction, and a first edge is provided on the side of the first end battery cell away from the first shielding strip, the battery cell is provided with an end battery cell on the end in the first direction, and a second edge is provided on the side of the end battery cell away from the first shielding strip, the second conductive member is arranged on the side of the first edge and the second edge along the second direction and is electrically connected to the battery cell, and the second shielding strips respectively cover the first edge and the second edge to shield the second conductive member.

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