Battery piece, solar battery string and photovoltaic module

Abstract

The utility model relates to a battery piece, a solar battery string and a photovoltaic module. The battery piece comprises a piece body, a front grid line and a light reflecting piece. The sheet body has a light-receiving surface, and the front grid lines are arranged on the light-receiving surface. The front grid lines comprise front auxiliary grids and front main grids, the number of the front auxiliary grids is at least two, all the front auxiliary grids are arranged at intervals in the first direction, and each front auxiliary grid extends in the second direction. And the front main grid is arranged on one side of all the front auxiliary grids along the first direction, extends along the first direction and is electrically connected with all the front auxiliary grids. And the at least one light reflecting part is arranged on the front auxiliary grid and is used for reflecting the incident light to the light receiving surface, so that the utilization rate of the incident light by the battery piece can be improved, and the power generation efficiency of the battery piece is improved.

Description

Technical Field

[0001] The present application relates to the technical field of solar cells, and in particular to a cell, a solar cell string and a photovoltaic module. Background Art

[0002] With the rapid development of the photovoltaic industry, photovoltaic production capacity has been rising steadily. Silver, as the main raw material for battery grid lines, is consumed in large quantities.

[0003] To save costs during cell production, copper grid lines are used instead of silver grid lines. However, the cross-section of the copper grid lines is nearly rectangular, and they cannot directly reflect incident light to the light-receiving surface of the cell. This results in low light utilization and high optical loss. Utility Model Content

[0004] Based on this, it is necessary to provide a solar cell, a solar cell string and a photovoltaic module to improve the utilization rate of the solar cell for incident light and reduce optical loss.

[0005] In a first aspect, the present application provides a battery cell, comprising:

[0006] a sheet body having a light-receiving surface;

[0007] A front grid line, the front grid line is arranged on the light-receiving surface, the front grid line includes a front sub-grid and a front main grid, at least two front sub-grids are provided, all the front sub-grids are spaced apart along a first direction, each of the front sub-grids extends along a second direction, the front main grid is arranged on one side of all the front sub-grids along the first direction, the front main grid extends along the first direction, the front main grid is electrically connected to all the front sub-grids, and the first direction intersects with the second direction; and

[0008] A reflector, wherein at least one reflector is provided and is arranged on the front sub-grid, and is used to reflect incident light to the light-receiving surface.

[0009] In one embodiment, there are at least two reflective elements, and all the reflective elements are arranged in a one-to-one correspondence with all the front sub-grids.

[0010] In one embodiment, the reflective element is provided with a first reflective portion and a second reflective portion, the first reflective portion and the second reflective portion both extend along the second direction, the first reflective portion and the second reflective portion are arranged opposite to each other, the first reflective portion and the second reflective portion are both arranged obliquely relative to the light receiving surface, the first reflective portion is used to reflect the incident light to the light receiving surface on one side of the front sub-grid, and the second reflective portion is used to reflect the incident light to the light receiving surface on the other side of the front sub-grid.

[0011] In one embodiment, the reflective element is further provided with a connecting portion, which is provided between the first reflective portion and the second reflective portion, one end of the connecting portion along the first direction is connected to the first reflective portion, and the other end of the connecting portion along the first direction is connected to the second reflective portion, and the connecting portion is connected to the side of the front sub-grid facing away from the sheet body, and the length of the connecting portion along the first direction is greater than or equal to the length of the front sub-grid along the first direction.

[0012] In one embodiment, the cross-sectional shape of the reflective element is an isosceles triangle, the two waists of the isosceles triangle are used to reflect the incident light to the light-receiving surface, the base of the isosceles triangle is connected to the front sub-grid, and the two base angles of the isosceles triangle are 45° to 72°.

[0013] In one embodiment, the length of the front sub-grid in the first direction is 60 μm to 100 μm.

[0014] In one embodiment, the height of the front sub-grid is 8 μm to 35 μm.

[0015] In one embodiment, the front grid line also includes a front welding grid line, which is used to electrically connect to the back grid line of an adjacent battery cell. The front welding grid line is arranged on the side of the front main grid away from the front sub-grid, and the front welding grid line extends along the second direction. The front welding grid line is electrically connected to the front main grid.

[0016] In a second aspect, the present application further provides a solar cell string, comprising:

[0017] The above-mentioned cell, wherein the cell is provided with at least two cells, the cell body further has a backlight surface, and the cell further includes back grid lines; and

[0018] A photovoltaic welding ribbon, wherein a first end of the photovoltaic welding ribbon is electrically connected to the front grid line of one of the adjacent solar cells, and a second end of the photovoltaic welding ribbon is electrically connected to the back grid line of another adjacent solar cell.

[0019] In a third aspect, the present application further provides a photovoltaic assembly comprising the above-mentioned solar cell string.

[0020] The above-mentioned cells, solar cell strings and photovoltaic modules are provided with reflectors on the front sub-grids. The reflectors can reflect incident light to the light-receiving surface of the cells, thereby improving the utilization rate of the incident light by the cells and thus improving the power generation efficiency of the cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1This is a schematic structural diagram of a battery cell according to an embodiment of the present application.

[0022] Figure 2 This is a schematic structural diagram of a sheet body according to an embodiment of the present application.

[0023] Figure 3 Schematic diagram of the structure of a reflective element according to an embodiment of the present application.

[0024] Figure 4 This is a side view of a reflective element according to an embodiment of the present application.

[0025] Figure 5 FIG. 1 is a structural diagram of a solar cell string according to an embodiment of the present application.

[0026] Figure 6 for Figure 5 A front view of a solar cell string is shown.

[0027] Description of Figure Numbers:

[0028] 10. Solar cell; 11. Cell body; 111. Light-receiving surface; 112. Backlight surface; 12. Front grid line; 121. Front sub-grid; 122. Front main grid; 123. Front welding grid line; 13. Back grid line; 131. Back sub-grid; 132. Back welding grid line; 14. Reflector; 141. First reflecting part; 142. Second reflecting part; 143. Connecting part; 20. Photovoltaic welding ribbon. DETAILED DESCRIPTION

[0029] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0030] See Figure 1 and Figure 2The solar cell 10 provided in one embodiment of the present application includes a cell body 11 and a front grid line 12. The cell body 11 has a light-receiving surface 111, and the front grid line 12 is arranged on the light-receiving surface 111. The front grid line 12 includes a front sub-grid 121 and a front main grid 122. There are at least two front sub-grids 121, and all the front sub-grids 121 are arranged at intervals along a first direction. Each front sub-grid 121 extends along a second direction, wherein the first direction intersects with the second direction, for example, the first direction is perpendicular to the second direction, and X represents the first direction and Y represents the second direction. The front main grid 122 is arranged on one side of all the front sub-grids 121 along the first direction, and the front main grid 122 extends along the first direction. The front main grid 122 is electrically connected to all the front sub-grids 121.

[0031] Optionally, see Figure 2 A front main grid 122 is provided on the light-receiving surface 111 of each cell 10 .

[0032] It should be noted that the function of the front auxiliary grid 121 is to collect the current of the solar cell 10 and transmit the current to the front main grid 122 , and the front auxiliary grid 121 does not bear any optical benefit.

[0033] In order to save costs, the front grid line 12 is made of copper grid line, and the cross-section of the copper grid line is rectangular. In this way, the incident light cannot be directly reflected to the light receiving surface 111 of the cell 10, resulting in a large optical loss. Figure 1 The cell 10 further includes a reflector 14. There is at least one reflector 14, which is disposed on the front sub-grid 121. Specifically, the reflector 14 is disposed on the side of the front sub-grid 121 facing away from the cell body 11. The reflector 14 is used to reflect incident light to the light-receiving surface 111.

[0034] The above-mentioned cell 10 is provided with a reflector 14 on the front sub-grid 121. The reflector 14 can reflect incident light to the light-receiving surface 111 of the cell 10, thereby improving the utilization rate of the incident light by the cell 10 and thus improving the power generation efficiency of the cell 10.

[0035] In one embodiment, see Figure 1 At least two reflectors 14 are provided, and all reflectors 14 are arranged in a one-to-one correspondence with all front sub-grids 121. It can be understood that each front sub-grid 121 is provided with a reflector 14, so that more incident light can be reflected to the light-receiving surface 111 of the cell 10, further improving the utilization rate of the incident light by the cell 10.

[0036] It should be noted that the length of the reflector 14 along the second direction can be set according to actual needs. Optionally, in the second direction, one end of the reflector 14 is flush with one end of the front sub-grid 121, and the other end of the reflector 14 is flush with the side of the front main grid 122 facing away from the front sub-grid 121. This can increase the length of the reflector 14, allowing more incident light to be reflected to the light-receiving surface 111 of the cell 10, thereby improving the utilization rate of the incident light by the cell 10.

[0037] In one embodiment, see Figure 1 、 Figure 3 and Figure 4 The reflector 14 includes a first reflective portion 141 and a second reflective portion 142. The first reflective portion 141 and the second reflective portion 142 are disposed opposite each other. The first reflective portion 141 is tilted relative to the light-receiving surface 111 and is configured to reflect incident light onto the light-receiving surface 111 on one side of the front sub-grid 121. The second reflective portion 142 is tilted relative to the light-receiving surface 111 and is configured to reflect incident light onto the light-receiving surface 111 on the other side of the front sub-grid 121.

[0038] When incident light strikes the first reflective portion 141, it reflects the incident light toward the light-receiving surface 111 on one side of the front sub-grid 121. When incident light strikes the second reflective portion 142, it reflects the incident light toward the light-receiving surface 111 on the other side of the front sub-grid 121. In this way, the cooperation between the opposing first and second reflective portions 141, 142 increases the amount of incident light reflected toward the light-receiving surface 111, improving the utilization rate of the incident light by the cell 10 and thereby increasing the power generation efficiency of the cell 10.

[0039] In one embodiment, see Figure 3 and Figure 4 The reflector 14 also includes a connecting portion 143. The connecting portion 143 is disposed between the first reflective portion 141 and the second reflective portion 142. One end of the connecting portion 143 along the first direction is connected to the first reflective portion 141, and the other end of the connecting portion 143 along the first direction is connected to the second reflective portion 142. The connecting portion 143 is connected to the front sub-grid 121. The length of the connecting portion 143 along the first direction is greater than the length of the front sub-grid 121 along the first direction. It is understood that the connecting portion 143 can completely block the front sub-grid 121, thereby ensuring that the incident light irradiating the first reflective portion 141 and the second reflective portion 142 is reflected to the light-receiving surface 111 of the solar cell 10 to the maximum extent possible.

[0040] Of course, in other embodiments, the length of the connecting portion 143 along the first direction may also be equal to the length of the front sub-grid 121 along the first direction.

[0041] In one embodiment, see Figure 3 and Figure 4 The cross-section of the reflector 14 is an isosceles triangle, wherein the first reflective portion 141 and the second reflective portion 142 are the two sides of the isosceles triangle, and the connecting portion 143 is the base of the isosceles triangle.

[0042] Further, see Figure 4 , the two base angles of the isosceles triangle are equal, and both base angles are 45° to 72°. It can be understood that the angle between the first reflective portion 141 and the connecting portion 143 is θ1, and the angle between the second reflective portion 142 and the connecting portion 143 is θ2, where 45°≤θ1≤72°, and 45°≤θ2≤72°. This arrangement can ensure that the incident light is reflected to the light-receiving surface 111 of the battery cell 10 to the maximum extent, thereby improving the utilization rate of the incident light by the battery cell 10. At the same time, it can also control the height of the reflective member 14 for easy packaging.

[0043] Optionally, the angle θ1 between the first reflecting portion 141 and the connecting portion 143 may be 45°, 50°, 55°, 60°, 65°, 70° and 72°, and the angle θ2 between the second reflecting portion 142 and the connecting portion 143 may be 45°, 50°, 55°, 60°, 65°, 70° and 72°.

[0044] In one embodiment, an adhesive layer is provided on the side of the front sub-grid 121 facing away from the sheet body 11, and the connecting portion 143 of the reflector 14 is bonded to the adhesive layer. In this way, the reflector 14 is bonded to the front sub-grid 121 through the adhesive layer to prevent the reflector 14 from falling off.

[0045] During production, a screen printer is used to print dots of glue on the side of the front sub-grid 121 facing away from the main body 11. Optionally, the glue can be a thermosetting silicone material. The reflector 14 is then placed on the front sub-grid 121, with the connecting portion 143 of the reflector 14 aligned with the side of the front sub-grid 121 facing away from the main body 11. The cell 10 is then cured, optionally at a temperature of 180°C to 240°C for a time of 6 to 12 seconds. This bonds the reflector 14 to the front sub-grid 121.

[0046] In one embodiment, the reflective element 14 includes a substrate. Optionally, the substrate is made of a high-temperature resistant material, such as PET (polyethylene terephthalate) and PA (Polyamide), which can reduce costs.

[0047] Furthermore, the base is an isosceles triangle. The first reflective portion 141 is provided at one waist of the base, and the second reflective portion 142 is provided at the other waist of the base. The reflectivity of the first reflective portion 141 and the second reflective portion 142 to incident light is not less than 85%. Optionally, the first reflective portion 141 and the second reflective portion 142 are made of aluminum foil or the like.

[0048] In one embodiment, see Figure 2 The length of the front sub-grid 121 in the first direction is 60 μm to 100 μm. The length of the front sub-grid 121 in the first direction is also the width of the front sub-grid 121. Optionally, the length of the front sub-grid 121 in the first direction is 60 μm, 70 μm, 80 μm, 90 μm, or 100 μm.

[0049] It should be noted that the length of the front sub-grid 121 of a conventional battery cell 10 in the first direction is 20μm to 40μm. Since the front sub-grid 121 does not bear optical gain in this embodiment, the length of the front sub-grid 121 in the first direction is 60μm to 100μm. This ensures that the cross-sectional area of ​​the front sub-grid 121 is large enough, which is beneficial to reducing the loss of current transmission.

[0050] In one embodiment, see Figure 2 The height of the front sub-grid 121 is 8 μm to 35 μm. Optionally, the height of the front sub-grid 121 is 8 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, and 35 μm. Thus, limiting the height of the front sub-grid 121 to the range of 8 μm to 35 μm can prevent excessive current transmission loss of the front sub-grid 121.

[0051] In one embodiment, see Figure 2 、 Figure 5 and Figure 6 The front grid line 12 also includes a front welding grid line 123, which is used to electrically connect to the back grid line 13 of the adjacent cell 10. The front welding grid line 123 is arranged on the side of the front main grid 122 away from the front sub-grid 121, and the front welding grid line 123 extends along the second direction. The front welding grid line 123 is electrically connected to the front main grid 122. When making a solar cell string, the first end of the photovoltaic welding ribbon 20 is welded to the back grid line 13 of one of the adjacent cells 10. The second end of the photovoltaic welding ribbon 20 does not need to span the entire light-receiving surface 111 of the cell 10. It is only necessary to weld the second end of the photovoltaic welding ribbon 20 to the front welding grid line 123 of another adjacent cell 10. In this way, the welding area can be reduced, and problems such as poor welding and ribbon offset caused by thermal stress can be reduced.

[0052] Further, participation Figure 2 and Figure 5 At least two front welding lines 123 are provided, and all front welding lines 123 are spaced apart along the first direction.

[0053] It should be noted that the number of front welding lines 123 can be set according to actual needs. Optionally, there are three front welding lines 123, which are spaced apart along the first direction, and each front welding line 123 extends along the second direction.

[0054] See Figure 5 and Figure 6 A solar cell string provided in one embodiment of the present application includes a photovoltaic ribbon 20 and a cell 10 as described in any of the above embodiments. There are at least two cells 10, each cell body 11 further having a backlight surface 112. The cell 10 also includes backside grid lines 13. A first end of the photovoltaic ribbon 20 is electrically connected to the front side grid lines 12 of one adjacent cell 10, and a second end of the photovoltaic ribbon 20 is electrically connected to the back side grid lines 13 of another adjacent cell 10.

[0055] In the solar cell string described above, since the reflector 14 is provided on the front sub-grid 121 , the reflector 14 can directly reflect the incident light to the light-receiving surface 111 of the cell 10 , thereby improving the utilization rate of the incident light by the cell 10 and thus improving the power generation efficiency of the cell 10 .

[0056] In one embodiment, the structure of the back gate line 13 is the same as that of the front gate line 12 .

[0057] Specifically, see Figure 5 and Figure 6 The back grid line 13 includes a back main grid, a back sub-grid 131, and a back welding grid line 132. There are at least two back sub-grids 131, all of which are spaced apart along the first direction. Each back sub-grid 131 extends along the second direction. The back main grid is arranged on one side of all the back sub-grids 131 along the first direction, and the back main grid is electrically connected to the back sub-grid 131. The back welding grid line 132 is arranged on the side of the back main grid away from the back sub-grid 131. The back welding grid line 132 extends along the second direction and is electrically connected to the back main grid. In this way, when manufacturing a solar cell string, the first end of the photovoltaic welding ribbon 20 is electrically connected to the front welding grid line 123 of one of the adjacent solar cells 10, and the other end of the photovoltaic welding ribbon 20 is electrically connected to the back welding grid line 132 of another adjacent solar cell 10.

[0058] Of course, in other embodiments, the structure of the back gate lines 13 may be different from that of the front gate lines 12 , and the present invention is not limited thereto.

[0059] A photovoltaic assembly according to an embodiment of the present application includes a solar cell string according to any one of the above embodiments.

[0060] In the above photovoltaic module, since the reflector 14 is provided on the front sub-grid 121, the reflector 14 can directly reflect the incident light to the light-receiving surface 111 of the cell 10, thereby improving the utilization rate of the incident light by the cell 10 and thus improving the power generation efficiency of the cell 10.

[0061] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0062] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0063] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0064] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0065] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0066] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A battery cell (10), characterized in that: include: A sheet body (11), wherein the sheet body (11) has a light-receiving surface (111); A front grid line (12), the front grid line (12) is provided on the light receiving surface (111), the front grid line (12) includes a front sub-grid (121) and a front main grid (122), at least two front sub-grids (121) are provided, all the front sub-grids (121) are arranged at intervals along a first direction, each of the front sub-grids (121) extends along a second direction, the front main grid (122) is provided on one side of all the front sub-grids (121) along the first direction, the front main grid (122) extends along the first direction, the front main grid (122) is electrically connected to all the front sub-grids (121), and the first direction intersects with the second direction; as well as A reflector (14), wherein at least one reflector (14) is provided, the reflector (14) is provided on the front sub-grid (121), and the reflector (14) is used to reflect incident light to the light-receiving surface (111).

2. The battery cell (10) according to claim 1, characterized in that: At least two of the reflective elements (14) are provided, and all of the reflective elements (14) are arranged in a one-to-one correspondence with all of the front sub-grids (121).

3. The battery cell (10) according to claim 1, characterized in that: The reflective element (14) is provided with a first reflective portion (141) and a second reflective portion (142), the first reflective portion (141) and the second reflective portion (142) both extend along the second direction, the first reflective portion (141) and the second reflective portion (142) are arranged opposite to each other, the first reflective portion (141) and the second reflective portion (142) are both arranged obliquely relative to the light receiving surface (111), the first reflective portion (141) is used to reflect incident light to the light receiving surface (111) on one side of the front sub-grid (121), and the second reflective portion (142) is used to reflect incident light to the light receiving surface (111) on the other side of the front sub-grid (121).

4. The battery cell (10) according to claim 3, characterized in that: The reflective element (14) is further provided with a connecting portion (143), the connecting portion (143) being provided between the first reflective portion (141) and the second reflective portion (142), one end of the connecting portion (143) along the first direction being connected to the first reflective portion (141), the other end of the connecting portion (143) along the first direction being connected to the second reflective portion (142), the connecting portion (143) being connected to a side of the front sub-grid (121) facing away from the sheet body (11), and the length of the connecting portion (143) along the first direction being greater than or equal to the length of the front sub-grid (121) along the first direction.

5. The battery cell (10) according to claim 1, characterized in that: The cross-sectional shape of the reflector (14) is an isosceles triangle, the two waists of the isosceles triangle are used to reflect incident light to the light-receiving surface (111), the base of the isosceles triangle is connected to the front sub-grid (121), and the two base angles of the isosceles triangle are 45° to 72°.

6. The battery cell (10) according to any one of claims 1 to 5, characterized in that: The length of the front sub-grid (121) in the first direction is 60 μm to 100 μm.

7. The battery cell (10) according to any one of claims 1 to 5, characterized in that: The height of the front sub-grid (121) is 8 μm to 35 μm.

8. The battery cell (10) according to any one of claims 1 to 5, characterized in that: The front grid line (12) further includes a front welding grid line (123), the front welding grid line (123) being used to electrically connect to the back grid line (13) of the adjacent battery cell (10), the front welding grid line (123) being arranged on a side of the front main grid (122) away from the front sub-grid (121), the front welding grid line (123) extending along the second direction, and the front welding grid line (123) being electrically connected to the front main grid (122).

9. A solar cell string, characterized in that: include: The cell (10) according to any one of claims 1 to 8, wherein the cell (10) is provided with at least two cells, the cell body (11) further has a backlight surface (112), and the cell (10) further includes a back grid line (13); and A photovoltaic welding ribbon (20), wherein a first end of the photovoltaic welding ribbon (20) is electrically connected to the front grid line (12) of one of the adjacent solar cells (10), and a second end of the photovoltaic welding ribbon (20) is electrically connected to the back grid line (13) of another adjacent solar cell (10).

10. A photovoltaic module, characterized in that: The solar cell string according to claim 9 is included.

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