Laminated solar cell module with hidden cell string gaps

Abstract

The utility model discloses a laminated solar cell module with hidden cell string gaps, comprising a plurality of cells, the cells are arranged along a first direction to form cell strings, and the plurality of cell strings are arranged along a second direction to form cell units; in the same battery string, one battery piece is partially overlapped with the other adjacent battery piece; the adjacent battery units are electrically connected through a first conductive part, a first gap is arranged between the adjacent battery units, the first conductive part is positioned in the first gap, and the first shielding strip is positioned in the first gap and can cover the first conductive part so as to shield the first conductive part. According to the utility model, the electric connection structure can be shielded, and the integrity and the aesthetic property of the front appearance are improved.

Description

Technical Field

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

[0002] Solar cell modules generally include the following layered structures from the front to the back: a front plate layer, a front film layer, a battery pack layer, a rear film layer, and a back plate. The battery pack layer includes multiple electrically connected battery strings, and the battery string is formed by electrically connecting multiple battery cells. The multiple battery cells are connected by welding ribbons, and the multiple battery strings are connected by bus bars. Generally, there are some gaps between adjacent battery cells and battery strings in solar cell modules. Existing stacked solar cell modules use adjacent battery cells to connect between cells. Although this connection method can eliminate the gaps between adjacent battery cells, the gaps between adjacent battery strings still exist. The existence of such gaps will cause the bus bars connected between adjacent battery strings to be exposed on the front of the battery. In addition, since the front of the battery cell is usually dark blue or black, and the bus bar is usually silver-white, the color difference between the two is large, which can easily form a noticeable color jump on the front of the module, resulting in inconsistent color on the front, thereby affecting 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 laminated solar cell assembly with hidden cell string gaps, which can shield the electrical connection structure and improve the integrity and aesthetics of the front appearance.

[0004] In order to solve the above technical problems, the utility model provides a stacked solar cell assembly with hidden cell string gaps, comprising a plurality of cell sheets, wherein the cell sheets are arranged along a first direction to form a cell string, and a plurality of the cell strings are arranged along a second direction to form a battery cell; in the same cell string, one cell partially overlaps with another adjacent cell; adjacent battery cells are electrically connected by 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 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 a fixed layer, the span of the fixed 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 fixed 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 fixed layer away from the back surface of the solar 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 an isolation layer, and the isolation layer is provided between the reflective layer and the fixed layer.

[0010] As an improvement to the above solution, the thickness of the reflective layer is smaller than the thickness of the isolation layer, and the thickness of the isolation layer is smaller than the thickness of the fixed 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, a second shielding strip is further included, wherein the battery unit 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 unit 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 shielding strips respectively cover the first edge and the second edge.

[0015] As an improvement to the above solution, a third shielding strip is further included. In the same battery unit, a second gap is provided between adjacent battery strings, and the length direction of the second gap is parallel to the first direction. The third shielding strip is adhered to the back side of the battery cell along the first direction and can cover the second gap.

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

[0017] The utility model discloses a laminated solar cell assembly with hidden cell string gaps, which is provided with a plurality of cell sheets, wherein the cell sheets are arranged along a first direction to form a cell string, and a plurality of the cell strings are arranged along a second direction to form a battery unit, and adjacent cell units are electrically connected via a first conductive member, and a first gap is provided between adjacent cell units. In order to be able to shield the first gap and the first conductive member, the laminated solar cell assembly with hidden cell string gaps is further provided with a first shielding strip, which is provided between adjacent cell units along the second direction, and is located in the first gap and can cover the first conductive member to shield the first conductive member. In this way, the electrical connection structure can be hidden, and the exposed back panel portion in the first gap can be shielded, thereby ensuring the integrity and aesthetics of the front appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a partial structural diagram of a laminated solar cell assembly with hidden cell string gaps according to the present invention;

[0019] Figure 2 This is a schematic cross-sectional view of the connection between the first shielding strip and the battery string of the present invention;

[0020] Figure 3 This is a schematic cross-sectional view of the first shielding strip in the first embodiment of the present utility model;

[0021] Figure 4 This is a schematic cross-sectional view of the first shielding strip in the second embodiment of the present utility model;

[0022] Figure 5 This is a partial structural diagram of a third embodiment of a laminated solar cell assembly with hidden cell string gaps according to the present invention;

[0023] Figure 6 This is a partial structural diagram of a fourth embodiment of a laminated solar cell assembly with hidden cell string gaps according to the present invention;

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

[0025] Figure 8 It is a partial structural diagram of the sixth embodiment of the laminated solar cell assembly with hidden cell string gaps of the present invention. DETAILED DESCRIPTION

[0026] 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.

[0027] See also Figure 1 and Figure 2 The embodiment of the present utility model discloses a laminated solar cell module with hidden gaps between battery strings, comprising 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 battery strings 13 are arranged along the second direction to form a battery cell 1. In the same battery string 13, one battery cell 131 partially overlaps with another adjacent battery cell 131 to form a laminated structure. The current in the battery string 13 is collected by wires such as welding ribbons and eventually converged onto a first conductive member 2, and adjacent battery cells 1 are electrically connected through the first conductive member 2, so that the circuits of two adjacent battery cells 1 converge 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, with the first direction and the second direction being perpendicular to each other. When observed from the front side of the battery cell 131 (the light-receiving side of the battery cell 131 ), the first conductive member 2 is exposed in the first gap 3 .

[0028] In order to shield the first conductive member 2 exposed in the first gap 3 and improve the integrity and aesthetics of the front appearance of the solar cell module, the laminated solar cell module with hidden cell string gaps further includes a first shielding strip 4, which 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 of the cell 131. Thus, when observed from the front of the 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 of the first shielding strip 4 to the same or similar color as the front of the cell 131, it is possible to avoid obvious color jumps and improve the color consistency of the front of the battery module.

[0029] The beneficial effects of the embodiments of the present utility model are as follows:

[0030] The laminated solar cell assembly with hidden cell string gaps in the embodiment of the present invention is provided with a plurality of cell sheets 131, the cell sheets 131 are arranged along a first direction to form a cell string 13, and the plurality of cell strings 13 are arranged along a second direction to form a battery cell 1, and the adjacent battery cells 1 are electrically connected via a first conductive member 2, and a first gap 3 is provided between adjacent battery cells 1. In order to be able to shield the first gap 3 and the first conductive member 2, the laminated solar cell assembly with hidden cell string gaps is further provided with a first shielding strip 4, and the first shielding strip 4 is provided between adjacent battery cells 1 along the second direction, and the first shielding strip 4 is located in the first gap 3 and can cover the first conductive member 2 to shield the first conductive member 2, so that the electrical connection structure can be hidden and the exposed back panel portion in the first gap 3 can be shielded, thereby ensuring the integrity and aesthetics of the front appearance.

[0031] Specifically, see Figure 2 The first shielding strip 4 is provided with a fixing layer 41. The span of the fixing 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 fixing layer 41 in the first direction is greater than the width of the first conductive member 2 in the first direction. The fixing layer 41 can both shield the first conductive member 2 and allow the first conductive member 2 to abut against the fixing layer 41. The fixing 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 on 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 fixing 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 fixing 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 fixing layer 41, thereby improving the fixing effect.

[0032] See also Figure 3In the first embodiment, the fixed 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 fixed 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 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 fixed layer, thereby achieving lower loss reflection and improving light utilization.

[0033] 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.

[0034] See also Figure 4 In the second embodiment, the first shielding strip 4 is further provided with an isolation layer 43, which is provided between the reflective layer 42 and the fixed layer 41. The isolation layer 43 can ensure that the first shielding strip 4 has a certain strength. Moreover, by providing the isolation layer 43 between the reflective layer 42 and the fixed layer 41, light can be reflected by the reflective layer 42 without passing through the isolation layer 43 and the fixed layer 41. The thickness of the fixed layer 41 is not less than that of the isolation layer 43 to provide a better connection effect with the solar cell 131. In addition, appropriately thinning the thickness of the isolation layer 43 can save material for the isolation layer 43. The reflective layer 42 does not play a supporting and fixing role and can be a relatively thin reflective coating or paint. The thickness of the isolation layer 43 is greater than that of the reflective layer 42.

[0035] The laminated solar cell assembly with hidden cell string gaps is equipped with multiple battery cells 1 and, therefore, multiple first gaps 3. In some common embodiments, the first gap 3 is typically located in the middle of the solar cell assembly to converge the current of all the cell strings 13. Typically, the multiple first gaps 3 are spaced apart along the length of the assembly.

[0036] See also Figure 5 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.

[0037] See also Figure 6In 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.

[0038] 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 fixing layer 41 and the isolation 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 not only affects the overall thickness of the entire solar cell, but also wastes materials.

[0039] See also Figure 7 , 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 cells 1 also has a gap. In the fifth embodiment, the stacked solar cell assembly with hidden battery string gaps further includes a second shielding strip 5, and the battery cell 1 is provided with a head end battery cell 11 at the head end in the first direction, and a first edge 111 is provided on the side of the head end battery cell 11 away from the first shielding strip 4, and the battery cell 1 is provided with a terminal battery cell 12 at the end in the first direction, and a second edge 121 is provided on the side of the terminal battery cell 12 away from the first shielding strip 4, respectively. The head end battery cell 11 and the terminal battery cell 12 are battery cells 131 located at the side edges of different battery cells 1, for example, the head end battery cell 11 is the battery cell 131 at the left edge of the first battery cell 1, and the terminal battery cell 12 is the battery cell 131 at the right edge of another adjacent battery cell, and the second shielding strip 5 covers the first edge 111 and the second edge 121 respectively to shield the first edge 111 and the second edge 121.

[0040] See also Figure 8In the sixth embodiment, within the same battery cell, adjacent cell strings 13 are arranged along the second direction, with a second gap 6 defined between adjacent cell strings 13. The length of the second gap 6 is parallel to the first direction. To conceal this second gap 6, the laminated solar cell assembly that conceals the cell string gap further includes a third shielding bar 8, which is adhered to the back surface of the cell 131 along the first direction and covers the second gap 6. The third shielding bar 8 has a similar structure to the first shielding bar 4, similarly comprising a fixing layer 41, a reflective layer 42, and an isolation layer 43. The combination of the first shielding bar 4, the second shielding bar 5, and the third shielding bar 8 allows for full shielding of the laminated solar cell gap, further enhancing the integrity and aesthetics of the front face of the assembly. Furthermore, by coloring the front faces of the first shielding bar 4, the second shielding bar 5, and the third shielding bar 8 the same or similar color as the front face of the cell 131, it is possible to avoid noticeable color contrast, further enhancing the aesthetics of the assembly.

[0041] 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 laminated solar cell module 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; in the same battery string, one battery cell partially overlaps with another adjacent battery cell; adjacent battery cells are electrically connected via a first conductive member, a first gap is defined between adjacent battery cells, the first conductive member is disposed along the second direction and 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 laminated solar cell assembly with hidden cell string gaps according to claim 1, characterized in that: The first shielding strip is provided with a fixing layer, the span of the fixing 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 fixing layer.

3. The laminated 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 fixed layer away from the back surface of the solar cell.

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

6. The laminated 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 isolation layer, and the thickness of the isolation layer is smaller than that of the fixed layer.

7. The laminated 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 laminated 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 laminated 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 laminated solar cell assembly with hidden cell string gaps according to claim 1, characterized in that: It also includes a second shielding strip, wherein the battery unit 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 unit 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, and the second shielding strips respectively cover the first edge and the second edge.

11. The laminated solar cell assembly with hidden cell string gaps according to claim 1, characterized in that: It also includes a third shielding strip. In the same battery unit, a second gap is provided between adjacent battery strings, and the length direction of the second gap is parallel to the first direction. The third shielding strip is adhered to the back of the battery cell along the first direction and can cover the second gap.

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