Photovoltaic module

Abstract

The utility model discloses a photovoltaic assembly, which comprises a battery piece and a plurality of first welding strips. The battery piece comprises a light receiving surface and a backlight surface which are oppositely arranged, and a plurality of first auxiliary grid lines which are distributed in parallel are arranged on the light receiving surface; the plurality of first welding strips are arranged on the light receiving surface of the battery piece and are perpendicular to the first auxiliary grid lines, each first welding strip comprises a first conductive base body with a circular section and a plurality of welding flux protrusions arranged on the outer side of the first conductive base body at intervals in the circumferential direction, and at least one welding flux protrusion abuts against the first auxiliary grid lines. According to the photovoltaic assembly of the utility model, through arranging the novel first welding strip, the contact area between the first welding strip and the first auxiliary grid line is increased, and the welding pulling force is increased through increasing the welding area; meanwhile, by increasing the contact area between the first welding strip and the glue point, the tension between the glue point and the welding strip is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of solar energy, and in particular relates to a photovoltaic component. Background Art

[0002] Existing main grid-free batteries usually use a glue dispensing process to fix the welding ribbon to multiple battery cells, and then weld the multiple battery cells to form a battery string. The welding ribbon in the prior art is a circular welding ribbon, and the contact area between the welding ribbon and the secondary grid line on the battery cell is small, and its welding tension is smaller than the welding tension between the welding ribbon and the main grid line. At the same time, during the glue dispensing process, the tension between the welding ribbon and the glue point is lower than the tension at the main grid pad point.

[0003] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0004] The utility model aims to provide a photovoltaic module, which can improve the welding tension between the welding strip and the secondary grid line, and increase the tension between the welding strip and the glue point.

[0005] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the utility model is as follows:

[0006] A photovoltaic module, comprising:

[0007] The cell comprises a light-receiving surface and a backlight surface which are arranged opposite to each other, and a plurality of first secondary grid lines which are arranged in parallel are arranged on the light-receiving surface;

[0008] A plurality of first welding strips are arranged on the light-receiving surface of the battery cell and are distributed perpendicularly to the first secondary grid line. The first welding strips include a first conductive substrate with a circular cross-section and a plurality of solder protrusions arranged at intervals along the circumferential direction on the outside of the first conductive substrate. At least one of the solder protrusions abuts against the first secondary grid line.

[0009] In one or more embodiments of the present invention, the first solder strip includes two solder protrusions abutting against the first secondary grid line.

[0010] In one or more embodiments of the present invention, at least four solder bumps are spaced apart on the outside of the first conductive substrate; and / or,

[0011] The opening angle between two adjacent solder protrusions along the circumferential direction of the first conductive substrate is 0° to 90°.

[0012] In one or more embodiments of the present invention, the solder protrusion includes a first surface facing the first conductive substrate and a second surface away from the first conductive substrate, the first surface and the second surface are both curved surfaces, and the curvature of the second surface is greater than the curvature of the first surface.

[0013] In one or more embodiments of the present invention, the solder protrusion further includes a first connecting surface and a second connecting surface connecting the first surface and the second surface, and the first connecting surface and the second connecting surface are parallel to each other.

[0014] In one or more embodiments of the present invention, the outer wall of the first conductive substrate is covered with a first solder layer, and the solder protrusion is arranged on the first solder layer.

[0015] In one or more embodiments of the present invention, the thickness of the solder bump is greater than 0 μm and less than or equal to 20 μm; and / or,

[0016] The diameter of the first conductive substrate is 0.1 mm to 0.3 mm.

[0017] In one or more embodiments of the utility model, a plurality of second secondary grid lines distributed in parallel are provided on the backlight surface; the photovoltaic module also includes a plurality of second welding strips, which are arranged on the backlight surface of the battery cell and distributed perpendicularly to the second secondary grid lines, and the second welding strips include a third surface abutting the second secondary grid lines and a fourth surface away from the second secondary grid lines, the third surface is a plane, and the fourth surface is a curved surface.

[0018] In one or more embodiments of the present invention, the cross-section of the second welding strip is semicircular or semi-elliptical.

[0019] In one or more embodiments of the present invention, the second solder strip includes a second conductive substrate and a second solder layer coated on the outer wall of the second conductive substrate, and the ratio of the width of the second conductive substrate to the width of the first conductive substrate is (0.5-2):1.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] The utility model provides a photovoltaic module, which increases the contact area between the first welding strip and the first secondary grid line by setting a novel first welding strip, and improves the welding tension by increasing the welding area; at the same time, increases the contact area between the first welding strip and the glue point, thereby increasing the tension between the glue point and the welding strip;

[0022] The utility model increases the contact area between the second welding strip and the second secondary grid line by setting a new type of second welding strip, thereby improving the welding tension by increasing the welding area; at the same time, it can reduce the height of the glue point on the backlight surface, thereby reducing the amount of glue used while ensuring the tension requirement between the glue point and the second welding strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic cross-sectional structural diagram of a photovoltaic module in Embodiment 1 of the present utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the solder protrusion in the first embodiment of the utility model;

[0026] Figure 3 Another cross-sectional structural schematic diagram of the photovoltaic module in the first embodiment of the utility model;

[0027] Figure 4 This is a schematic cross-sectional structural diagram of a photovoltaic module in Embodiment 4 of the present utility model;

[0028] Figure 5 This is a schematic cross-sectional structural diagram of a photovoltaic module in Embodiment 5 of the present utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the solder protrusion in the sixth embodiment of the utility model;

[0030] Figure 7 This is a schematic diagram of the structure of the first welding strip in the seventh embodiment of the present utility model. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0034] The technical solution of the present utility model will be described below in conjunction with the accompanying drawings.

[0035] Embodiment 1:

[0036] Reference Figure 1 As shown, a photovoltaic module in an embodiment of the utility model includes: a battery cell 1 and a plurality of first welding strips 2.

[0037] Among them, the battery cell 1 includes a light-receiving surface 11 and a backlight surface 12 that are arranged opposite to each other, and a plurality of first secondary grid lines 111 are arranged on the light-receiving surface 11; a plurality of first welding strips 2 are arranged on the light-receiving surface 11 of the battery cell 1 and are distributed perpendicular to the first secondary grid lines 111, and the first welding strips 2 include a first conductive substrate 21 with a circular cross-section and a plurality of solder protrusions 22 that are arranged at intervals along the circumferential direction on the outside of the first conductive substrate 21, and at least one solder protrusion 22 is abutted against the first secondary grid line 111.

[0038] Specifically, refer to Figure 1 As shown, the first soldering strip 2 in this embodiment includes two solder protrusions 22 abutting against the first secondary grid line 111. The solder protrusions 22 in this embodiment are directly arranged on the outer wall of the first conductive substrate 21.

[0039] The contact area between the existing circular welding strip and the first secondary grid line 111 and the light receiving surface 11 is a linear contact area, while compared with the existing circular welding strip, the contact area between the first welding strip 2 and the first secondary grid line 111 and the light receiving surface 11 is two linear contact areas, so the design of the first welding strip 2 increases the contact area between the first welding strip 2 and the first secondary grid line 111, increases the welding area, and improves the welding tension; at the same time, in the glue dispensing process, the design of the first welding strip 2 increases the contact area with the glue point, and increases the tension between the glue point and the first welding strip 2. In addition, the amount of solder used can be reduced, and the production cost of the first welding strip 2 can be reduced.

[0040] It is understandable that if the angle between two adjacent solder protrusions 22 along the circumference of the first conductive substrate 21 is too large, they cannot abut against the first secondary grid line 111 . If the angle is too small, such as 0, the shape is similar to that of an existing solder strip.

[0041] Therefore, in order to facilitate the solder bump 22 to abut against the first secondary gate line 111, refer to Figure 1As shown, the first solder strip 2 in this embodiment includes a first conductive substrate 21 with a circular cross section and six solder protrusions 22 arranged at intervals along the circumferential direction outside the first conductive substrate 21, and two solder protrusions 22 abut against the first secondary grid line 111. The opening angle α1 of two adjacent solder protrusions 22 along the circumferential direction of the first conductive substrate 21 is 60°.

[0042] Of course, the present application is not limited thereto. In other embodiments, the opening angle of two adjacent solder protrusions 22 along the circumferential direction of the first conductive substrate 21 may be 10°, 90°, or any value between 0° and 90°.

[0043] Specifically, refer to Figure 2 As shown, the solder protrusion 22 in this embodiment includes a first surface 221 facing the first conductive substrate 21 and a second surface 222 away from the first conductive substrate 21, and the first surface 221 and the second surface 222 are both curved surfaces, and the curvature of the second surface 222 is greater than the curvature of the first surface 221. It should be noted that when processing the first solder strip 2, the interval-arranged solder protrusions 22 are formed by segmented control of the wind knife. After the processing is completed, the first surface 221 is in contact with the outer wall of the first conductive substrate 21, and the second surface 222 is in contact with the first secondary grid line 111. Among them, the first surface 221 and the second surface 222 can be directly connected or indirectly connected.

[0044] For example, the thickness of the solder bump 22 in this embodiment is 15 μm. Of course, the present application is not limited thereto, and the thickness of the solder bump 22 may be 0.1 μm, 20 μm, or any value greater than 0 μm and less than or equal to 20 μm.

[0045] For example, the diameter of the first conductive substrate 21 in this embodiment is 0.23 mm. Of course, the present application is not limited thereto, and the diameter of the first conductive substrate 21 can be 0.1 mm, or 0.3 mm, or any value between 0.1 mm and 0.3 mm.

[0046] Reference Figure 3As shown, in this embodiment, a plurality of parallel second secondary grid lines 121 are arranged on the backlight surface 12; the photovoltaic module also includes a plurality of second welding strips 3, which are arranged on the backlight surface 12 of the cell 1 and are vertically distributed with the second secondary grid lines 121, and the second welding strips 3 include a third surface abutting against the second secondary grid lines 121 and a fourth surface away from the second secondary grid lines 121, the third surface is a plane, and the fourth surface is a curved surface. According to this design, compared with the existing circular welding strip, the contact area between the third surface and the second secondary grid lines 121 and the backlight surface 12 is a planar contact area, while the contact area between the existing circular welding strip and the second secondary grid lines 121 and the backlight surface 12 is a linear contact area, therefore, the setting of the third surface can increase the contact area between the second welding strip 3 and the second secondary grid lines 121, increase the welding area, increase the welding tension, and improve the weldability; in addition, in the glue dispensing process, the height of the glue point on the backlight surface 12 can be reduced, and the glue point amount can be reduced while ensuring the tension requirement between the glue dispensing and the second welding strip 3.

[0047] Preferably, refer to Figure 3 As shown, the cross section of the second welding strip 3 in this embodiment is semicircular or semi-elliptical. According to this design, the width of the second welding strip 3 is greater than the thickness of the second welding strip 3, so as to reduce the height of the glue point on the backlight surface 12, thereby reducing the amount of glue used.

[0048] The second solder strip 3 in this embodiment includes a second conductive substrate 31 and a second solder layer 32 coated on the outer wall of the second conductive substrate 31. The ratio of the width of the second conductive substrate 31 to the width of the first conductive substrate 21 is (0.5-2):1. Exemplarily, when the width of the first conductive substrate 21 is 230 μm, the width of the second conductive substrate 31 can be 115 μm, or 460 μm, or any value between 115 μm and 460 μm. Of course, the present application is not limited to this. In other embodiments, the width of the first conductive substrate 21 can be other values ​​besides 230 μm. For example, if the width of the first conductive substrate 21 is 115 μm, the width of the second conductive substrate 31 can be 57.5 μm, or 230 μm, or any value between 57.5 μm and 230 μm. It can be understood that the protection scope of the present utility model is not limited to the above examples.

[0049] Embodiment 2:

[0050] The cell 1 , the first soldering ribbon 2 , and the second soldering ribbon 3 in this embodiment are substantially the same as those in the first embodiment, except that the number of solder bumps 22 abutting against the first secondary grid lines 111 is different.

[0051] Specifically, a solder protrusion 22 on the first soldering strip 2 in this embodiment abuts against the first secondary gate line 111 .

[0052] Embodiment three:

[0053] The cell 1 , the first soldering ribbon 2 , and the second soldering ribbon 3 in this embodiment are substantially the same as those in the first embodiment, except that the number of solder bumps 22 abutting against the first secondary grid lines 111 is different.

[0054] Specifically, the three solder protrusions 22 on the first soldering strip 2 in this embodiment abut against the first secondary gate line 111 .

[0055] Of course, the present application is not limited thereto, and four solder bumps 22 may abut against the first secondary gate line 111, or five solder bumps 22 may abut against the first secondary gate line 111, etc., as long as the number of solder bumps 22 abutting against the first secondary gate line 111 is greater than or equal to four.

[0056] Comparing the second and third embodiments with the first embodiment, the following results can be obtained:

[0057] Compared with the solution in which only one solder protrusion 22 is in contact with the first secondary grid line 111, the solution in which two solder protrusions 22 are in contact with the first secondary grid line 111 can further increase the contact area between the first welding strip 2 and the first secondary grid line 111, increase the welding area, and improve the welding tension; at the same time, the first welding strip 2 is not easy to roll over, and it is not easy to cause the first welding strip 2 to deviate.

[0058] Compared with the solution of at least three solder bumps 22 abutting against the first secondary grid line 111 , the solution of two solder bumps 22 abutting against the first secondary grid line 111 is easier to process, and when the number of solder bumps 22 is small, the cost of the first soldering strip 2 is lower.

[0059] Embodiment 4:

[0060] Reference Figure 4 As shown, the battery cell 1, the first welding ribbon 2, and the second welding ribbon 3 in this embodiment are substantially the same as the battery cell 1, the first welding ribbon 2, and the second welding ribbon 3 in the first embodiment, except that the number of solder protrusions is different.

[0061] Specifically, the first solder strip 2 in this embodiment includes a first conductive substrate 21 with a circular cross section and seven solder protrusions 22 arranged at intervals along the circumferential direction outside the first conductive substrate 21, and two solder protrusions 22 abut against the first secondary grid line 111. The opening angle α2 of two adjacent solder protrusions 22 along the circumferential direction of the first conductive substrate 21 is approximately 51°.

[0062] Embodiment five:

[0063] Reference Figure 5As shown, the battery cell 1, the first welding ribbon 2, and the second welding ribbon 3 in this embodiment are substantially the same as the battery cell 1, the first welding ribbon 2, and the second welding ribbon 3 in the first embodiment, except that the number of solder protrusions is different.

[0064] Specifically, the first solder strip 2 in this embodiment includes a first conductive substrate 21 with a circular cross section and eight solder protrusions 22 arranged at intervals along the circumferential direction outside the first conductive substrate 21, and two solder protrusions 22 abut against the first secondary grid line 111. The opening angle α3 of two adjacent solder protrusions 22 along the circumferential direction of the first conductive substrate 21 is 45°.

[0065] Embodiment six:

[0066] Reference Figure 6 As shown, the battery cell 1, the first welding ribbon 2, and the second welding ribbon 3 in this embodiment are substantially the same as the battery cell 1, the first welding ribbon 2, and the second welding ribbon 3 in the first embodiment, except that the structure of the solder protrusion is different.

[0067] Specifically, the solder protrusion 22 in this embodiment includes a first surface 221 and a second surface 222, and also includes a first connection surface 223 and a second connection surface 224 connecting the first surface 221 and the second surface 222, and the first connection surface 223 and the second connection surface 224 are parallel to each other. By changing the segmented control parameters of the air knife, the first connection surface 223 and the second connection surface 224 can be formed between the first surface 221 and the second surface 222.

[0068] Embodiment seven:

[0069] Reference Figure 7 As shown, the battery cell 1 and the second welding ribbon 3 in this embodiment are substantially the same as the battery cell 1 and the second welding ribbon 3 in the first embodiment, except that the structure of the first welding ribbon 2 is different.

[0070] Specifically, in this embodiment, the outer wall of the first conductive substrate 21 is coated with a first solder layer 23 , and the solder protrusion 22 is disposed on the first solder layer 23 .

[0071] It can be seen from the above technical solutions that the utility model has the following beneficial effects:

[0072] The utility model provides a photovoltaic module, which increases the contact area between the first welding strip and the first secondary grid line by setting a novel first welding strip, and improves the welding tension by increasing the welding area; at the same time, increases the contact area between the first welding strip and the glue point, thereby increasing the tension between the glue point and the welding strip;

[0073] The utility model increases the contact area between the second welding strip and the second secondary grid line by setting a new type of second welding strip, thereby improving the welding tension by increasing the welding area; at the same time, it can reduce the height of the glue point on the backlight surface, thereby reducing the amount of glue used while ensuring the tension requirement between the glue point and the second welding strip.

[0074] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0075] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A photovoltaic module, characterized in that: The photovoltaic module comprises: The cell comprises a light-receiving surface and a backlight surface which are arranged opposite to each other, and a plurality of first secondary grid lines which are arranged in parallel are arranged on the light-receiving surface; A plurality of first welding strips are arranged on the light-receiving surface of the battery cell and are distributed perpendicularly to the first secondary grid line. The first welding strips include a first conductive substrate with a circular cross-section and a plurality of solder protrusions arranged at intervals along the circumferential direction on the outside of the first conductive substrate. At least one of the solder protrusions abuts against the first secondary grid line.

2. The photovoltaic module according to claim 1, characterized in that: The first solder strip includes two solder protrusions abutting against the first secondary gate line.

3. The photovoltaic module according to claim 1, characterized in that: At least four solder bumps are arranged at intervals on the outer side of the first conductive substrate; and / or, The opening angle between two adjacent solder protrusions along the circumferential direction of the first conductive substrate is 0° to 90°.

4. The photovoltaic module according to claim 1, characterized in that: The solder protrusion includes a first surface facing the first conductive substrate and a second surface away from the first conductive substrate. The first surface and the second surface are both curved surfaces, and the curvature of the second surface is greater than that of the first surface.

5. The photovoltaic module according to claim 4, characterized in that: The solder bump further includes a first connection surface and a second connection surface connecting the first surface and the second surface, and the first connection surface and the second connection surface are parallel to each other.

6. The photovoltaic module according to claim 1, characterized in that: The outer wall of the first conductive substrate is covered with a first solder layer, and the solder protrusion is arranged on the first solder layer.

7. The photovoltaic module according to claim 1, characterized in that: The thickness of the solder bump is greater than 0 μm and less than or equal to 20 μm; and / or, The diameter of the first conductive substrate is 0.1 mm to 0.3 mm.

8. The photovoltaic module according to claim 1, characterized in that: A plurality of second secondary grid lines distributed in parallel are arranged on the backlight surface; the photovoltaic module also includes a plurality of second welding strips, which are arranged on the backlight surface of the battery cell and distributed perpendicularly to the second secondary grid lines, and the second welding strips include a third surface abutting the second secondary grid lines and a fourth surface away from the second secondary grid lines, the third surface is a plane, and the fourth surface is a curved surface.

9. The photovoltaic module according to claim 8, characterized in that: The cross section of the second welding strip is semicircular or semi-elliptical.

10. The photovoltaic module according to claim 8, characterized in that: The second solder strip includes a second conductive substrate and a second solder layer coated on an outer wall of the second conductive substrate. The ratio of the width of the second conductive substrate to the width of the first conductive substrate is (0.5-2):1.

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