Photovoltaic module and photovoltaic system

Abstract

The invention provides a photovoltaic module and a photovoltaic system. The photovoltaic module comprises a main-grid-free back contact solar cell, an insulating unit and a solder strip, wherein a first grid line and a second grid line are arranged on the surface of the main-grid-free back contact solar cell; the insulating unit comprises a first insulating adhesive film section and a second insulating adhesive film section; a welding point is arranged on each first grid line along a preset first welding strip line; each second grid line is coated with a first insulating adhesive film section; the plurality of second insulating adhesive film sections are coated at the positions close to the welding points and are in adhesive joint with the two adjacent first insulating adhesive film sections; and the welding strip is arranged along the first welding strip circuit and is welded with the welding points on the plurality of first grid lines. According to the embodiment of the invention, the two opposite sides of the welding point are coated with the second insulating adhesive film sections, and the second insulating adhesive film sections are in adhesive joint with the two adjacent first insulating adhesive film sections, so that a closed city wall is formed around the welding point; therefore, the packaging adhesive film is prevented from permeating into the contact position of the welding point and the welding strip, and the welding point and the welding strip are prevented from being unsoldered.

Description

Technical Field

[0001] The present application relates to the technical field of solar cells, and particularly to a photovoltaic module and a photovoltaic system. Background Art

[0002] On a main-gridless back-contact solar cell, there are multiple positive fine grids and multiple negative fine grids, and the multiple positive fine grids and the multiple negative fine grids are arranged in an interleaved manner. When a solder ribbon is welded to the multiple positive (negative) fine grids, an insulating adhesive film is used to cover the multiple negative (positive) fine grids to prevent the solder ribbon from contacting the negative (positive) fine grids and causing a short circuit.

[0003] In this method, the contact surface between the solder ribbon and the multiple positive (negative) fine grids is small; after the solder ribbon is welded, the main-gridless back-contact solar cell is encapsulated with an encapsulating adhesive film and an encapsulating glass, and then laminated to obtain a photovoltaic module; during the lamination process, the encapsulating adhesive film may penetrate to the contact surface, resulting in insecure welding between the solder ribbon and the multiple positive (negative) fine grids, which affects the product quality of the photovoltaic module.

[0004] It should be noted that the above content is not necessarily prior art and does not limit the patent protection scope of the present application. Summary of the Invention

[0005] Embodiments of the present application provide a photovoltaic module and a photovoltaic system to solve or alleviate one or more of the above-mentioned technical problems.

[0006] As a first aspect of the embodiments of the present application, the embodiments of the present application provide a photovoltaic module, including: A main-gridless back-contact solar cell, on the surface of which there are multiple grid lines, the multiple grid lines include first grid lines and second grid lines with opposite polarities, and the multiple first grid lines and the multiple second grid lines are arranged in an interleaved manner at a preset interval; wherein, along a preset first solder ribbon path, there is a welding point on each first grid line; An insulating unit, the insulating unit includes multiple first insulating adhesive film segments and multiple second insulating adhesive film segments; along the first solder ribbon path, each second grid line is coated with a first insulating adhesive film segment; the multiple second insulating adhesive film segments are coated at positions close to the welding points, and the two second insulating adhesive film segments on the opposite sides of the welding point are adhesively bonded to the adjacent two first insulating adhesive film segments; A solder ribbon, the solder ribbon is arranged along the first solder ribbon path and welded to the welding points on the multiple first grid lines.

[0007] As a second aspect of the embodiments of the present application, the embodiments of the present application provide a photovoltaic system, and the photovoltaic system includes the photovoltaic module according to any one of the above embodiments.

[0008] In the embodiments of the present application, by coating second insulating film segments on opposite sides of the welding point and bonding them to two adjacent first insulating film segments, a closed city wall is formed around the welding point, thereby preventing the encapsulation film from penetrating into the contact position between the welding point and the welding strip, avoiding the de-welding of the welding point and the welding strip, and improving the photoelectric conversion efficiency of the solar cell. Description of the Drawings

[0009] In the drawings, unless otherwise specified, the same reference numerals throughout the several views denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0010] Figure 1 Showing a schematic structural view of the surface of a main-gridless back-contact solar cell in an existing photovoltaic module.

[0011] Figure 2 Showing a schematic cross-sectional view of the surface of a main-gridless back-contact solar cell in an existing photovoltaic module.

[0012] Figure 3 Showing a schematic structural view of the surface of a main-gridless back-contact solar cell in a photovoltaic module provided by an embodiment of the present application.

[0013] Figure 4 Showing a schematic structural view of the surface of a main-gridless back-contact solar cell in a photovoltaic module provided by another embodiment of the present application.

[0014] Figure 5 Showing a schematic cross-sectional view of a partial position in a photovoltaic module provided by an embodiment of the present application.

[0015] Figure 6 Showing a schematic cross-sectional view of a partial position in a photovoltaic module provided by another embodiment of the present application.

[0016] Figure 7 Showing a schematic cross-sectional view of a partial position in a photovoltaic module provided by still another embodiment of the present application. Detailed Embodiments

[0017] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and embodiments.

[0018] It should be noted that in the description of the present application, the claims and the above-mentioned drawings, the terms "first", "second", etc. are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0019] In the present application, when it comes to numerical intervals (i.e., numerical ranges), unless otherwise specified, the distribution of the optional numerical values within the numerical interval is considered continuous, and includes the two numerical endpoints of the numerical interval (i.e., the minimum value and the maximum value), as well as each numerical value between these two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to the integers within the numerical interval, it includes the two endpoint integers of the numerical range, as well as each integer between the two endpoints, which is equivalent to directly listing each integer. When providing multiple numerical ranges to describe features or characteristics, these numerical ranges can be combined. In other words, unless otherwise specified, the numerical ranges disclosed in the present application should be understood to include any and all sub-ranges subsumed therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. The "numerical interval" allows for a broad inclusion of quantitative intervals such as percentage intervals, ratio intervals, and ratio intervals.

[0020] Next, exemplary embodiments according to the present application will be described in more detail with reference to the drawings. It should be noted that these exemplary embodiments can be implemented in many different forms and should not be construed as being limited only to the embodiments set forth herein.

[0021] Figure 1 The structural schematic diagram of the surface of a main-gridless back-contact solar cell in an existing photovoltaic module is shown. Figure 2 The cross-sectional structural schematic diagram of the surface of a main-gridless back-contact solar cell in an existing photovoltaic module is shown. As Figure 1 and Figure 2As shown, on the surface of the main-gridless back-contact solar cell 100, first grid lines 210 and second grid lines 220 are arranged in a staggered pattern at a preset interval. For example, the first grid lines 210 are positive grid lines, and the second grid lines 220 are negative grid lines; the solder tape 400 needs to be welded to the welding points 310 on multiple positive (negative) grid lines. To avoid short circuits, before welding the solder tape 400, a first insulating film is plated on the negative (positive) grid lines, and the formed first insulating film segments 320 can isolate the contact between the solder tape 400 and the negative (positive) grid lines. Due to the welding points 310, a spatial relationship is formed among the surface of the main-gridless back-contact solar cell 100, the solder tape 400, and the first insulating film segments 320, and it is difficult to avoid gaps between them; during the lamination process of the photovoltaic module, the encapsulant film 500 has good fluidity and easily flows through these gaps to between the solder tape 400 and the welding points 310, resulting in possible de-welding between the solder tape 400 and the welding points 310; furthermore, due to the thermal expansion and contraction of the encapsulant film 500, it will further cause the separation between the solder tape 400 and the welding points 310; therefore, in this existing photovoltaic module structure, it is easy to have the situation where the solder tape 400 is de-welded from the welding points 310, which affects the power generation efficiency of the photovoltaic module and reduces the product quality of the photovoltaic module. An embodiment of the present application provides a photovoltaic module to avoid the situation where the solder tape 400 is de-welded from the welding points 310, improve the stability of the power generation efficiency of the photovoltaic module, and improve the product quality and service life of the photovoltaic module. Figure 3 The structural schematic diagram of the surface of the main-gridless back-contact solar cell in the photovoltaic module provided by an embodiment of the present application is shown. Figure 4 The structural schematic diagram of the surface of the main-gridless back-contact solar cell in the photovoltaic module provided by another embodiment of the present application is shown. As Figure 3 and Figure 4 As shown, the photovoltaic module includes a main-gridless back-contact solar cell 100, an insulating unit, and a solder tape 400.

[0022] On the surface of the main-gridless back-contact solar cell 100, there are multiple grid lines, including multiple first grid lines 210 and multiple second grid lines 220. The electrode polarities of the first grid lines 210 and the second grid lines 220 are opposite, and the multiple first grid lines 210 and the multiple second grid lines 220 are arranged in a staggered pattern at a preset interval; among them, along a preset first solder tape path, each first grid line 210 is provided with a welding point 310 for welding with the solder tape 400. Along a preset second solder tape path, each second grid line 220 is provided with a welding point 310.

[0023] Exemplarily, the first grid line 210 can be a positive grid line, and the second grid line 220 can be a negative grid line. A plurality of first grid lines 210 / second grid lines 220 are arranged on the surface of the back-contact solar cell 100 without main grids, so that positive / negative carriers can be led out from multiple places. The plurality of first grid lines 210 and the plurality of second grid lines 220 are arranged alternately at a preset interval, so that the average value of the movement path of the carriers is short, and the photoelectric conversion efficiency of the solar cell can be improved.

[0024] In order to lead out current from the solar cell, a plurality of first grid lines 210 / second grid lines 220 need to be connected in series through the welding tape 400. When the welding tape 400 connects a plurality of first grid lines 210 along a preset first welding tape line, it cannot be connected to the second grid line 220, otherwise a short circuit will occur. The welding tape 400 includes at least two. The first welding tape 410 is used to weld to the welding point 310 on a plurality of first grid lines 210 along a preset first welding tape line, and the second welding tape 420 is used to weld to the welding point 310 on a plurality of second grid lines 220 along a preset second welding tape line, so as to lead out positive and negative carriers respectively, and form the positive and negative poles of the photovoltaic module.

[0025] Along the first welding tape line, a welding point 310 is provided on each first grid line 210 to facilitate the welding of the first welding tape 410 to the plurality of first grid lines 210, and form the positive pole of the photovoltaic module. Correspondingly, along the second welding tape line, a welding point 310 is provided on each second grid line 220 to facilitate the welding of the second welding tape 420 to the plurality of second grid lines 220, and form the negative pole of the photovoltaic module.

[0026] The first welding tape line and the second welding tape line can be parallel to each other or approximately parallel.

[0027] The welding point 310 can be a point on the first grid line 210; or a structure facilitating welding with the welding tape 400 can be provided at a specified position in the first grid line 210 (such as a position aligned with the first welding tape line) to form the welding point 310. For example, a solder pad can be provided at the specified position, or a metal conductive layer can be further plated on the solder pad to increase the height of the welding point 310, so that the height of the welding point 310 can protrude to facilitate the contact between the welding point 310 and the welding tape 400.

[0028] The insulating unit includes a plurality of first insulating film segments 320 and a plurality of second insulating film segments 330; along the first welding tape line, a first insulating film segment 320 is coated on each second grid line 220.

[0029] It can be understood that along the second welding tape line, a first insulating film segment 320 is coated on each first grid line 210.

[0030] A plurality of second insulating film segments 330 are coated at positions close to the welding points, and the two second insulating film segments 330 on the opposite sides of the welding point 310 are adhesively bonded to the adjacent two first insulating film segments 320.

[0031] The first insulating film segment 320 is used to isolate the contact between the welding ribbon 400 and the first grid line 210 / second grid line 220, avoiding short circuits.

[0032] Specifically, along the first welding ribbon line, a welding point 310 is provided on each first grid line 210 to facilitate the welding of the first welding ribbon 410 to multiple first grid lines 210. The first insulating film segment 320 on each second grid line 220 is used to isolate the contact between the first welding ribbon 410 and the second grid line 220.

[0033] Correspondingly, along the second welding ribbon line, a welding point 310 is provided on each second grid line 220 to facilitate the welding of the second welding ribbon 420 to multiple second grid lines 220. The first insulating film segment 320 on each first grid line 210 is used to isolate the contact between the second welding ribbon 420 and the first grid line 210.

[0034] The first insulating film segment 320 is a small segment provided in the first grid line 210 / second grid line 220. Its length is greater than the width of the welding point 310 and greater than the width of the welding ribbon 400, and can be 3 / 2 to 5 times the width of the welding ribbon 400.

[0035] In the case where the requirements for the photoelectric conversion efficiency of photovoltaic modules are getting higher and higher, the width of the welding ribbon 400 is getting narrower and the contact area between the welding ribbon 400 and the welding point 310 is getting smaller. Therefore, when some encapsulation film 500 penetrates between the welding point 310 and the welding ribbon 400, it is easy to cause de-welding. When the welding ribbon 400 is welded to the welding point 310, the welding ribbon 400 usually covers the welding point 310. When the second insulating film is coated on the opposite sides of the welding point 310, it can prevent the encapsulation film 500 from flowing towards the welding point 310 and infiltrating from the opposite sides of the welding point 310.

[0036] The adjacent two first insulating film segments 320 are located on the front and back sides of the welding point 310, while the second insulating film segments 330 are distributed on the left and right sides of the welding point 310. The second insulating film segments 330 are at least adhesively bonded to the adjacent two first insulating film segments 320, then a closed city wall can be formed around the welding point 310, thereby blocking the infiltration of the encapsulation film 500.

[0037] The welding ribbon 400 includes at least two. The first welding ribbon 410 is arranged along the first welding ribbon line and welded to the welding points 310 on multiple first grid lines 210. The second welding ribbon 420 is arranged along the second welding ribbon line and welded to the welding points 310 on multiple second grid lines 220.

[0038] In some other examples, there may also be multiple solder tapes 400, such as 4, 5, 8 or other numbers. The multiple solder tapes 400 can extract carriers from multiple positions on the first grid line 210 / second grid line 220 to reduce the movement path of the carriers and improve the photoelectric conversion efficiency of the solar cell.

[0039] Multiple first grid lines 210 may be welded to multiple solder tapes 400, and the welding routes of the remaining solder tapes 400 may be parallel or approximately parallel to the first solder tape route.

[0040] The first solder tape route in the embodiments of the present application generally refers to the solder tape route welded to multiple first grid lines 210 among multiple grid lines. On the first solder tape route, welding points 310 corresponding to the positions of the first solder tape route are arranged on each first grid line 210 for welding with the first solder tape 410; the second solder tape route is similar.

[0041] The first solder tape route, the second solder tape route and the first grid line 210 / second grid line 220 are all arranged at an angle, and the angle is approximately a right angle (or the angle is 75°-105°), so that the solder tape 400 can penetrate through multiple first grid lines 210 / second grid lines 220.

[0042] The distance between the two second insulating film segments 330 on the opposite sides is adapted to the width of the solder tape 400. It can be that the distance between the two second insulating film segments 330 on the opposite sides is greater than the width of the solder tape 400, or it can be that the distance between the two second insulating film segments 330 on the opposite sides is less than the width of the solder tape 400. In both cases, it can avoid the encapsulation film 500 from penetrating into the contact surface between the solder tape 400 and the welding point 310, thereby avoiding de-welding.

[0043] In the embodiments of the present application, by coating the second insulating film segments 330 on the opposite sides of the welding point 310 and bonding them to the adjacent two first insulating film segments 320, a closed city wall is formed around the welding point 310; thereby blocking the encapsulation film 500 from penetrating into the contact position between the solder tape 400 and the welding point 310, avoiding de-welding between the welding point 310 and the solder tape 400, and improving the photoelectric conversion efficiency of the solar cell.

[0044] In one implementation, the height of the first insulating film segment 320 / second insulating film segment 330 is 1 / 5 to 1 of the height of the welding point 310.

[0045] On the first grid line 210 and the second grid line 220, the welding point 310 may include a pad and a conductive layer. The conductive layer is plated on the pad to increase the height of the welding point 310, facilitating the welding of the welding strip 400 to the first grid line 210 or the second grid line 220. Since the first insulating film segment 320 / the second insulating film segment 330 is coated on the surface of the main-gridless back-contact solar cell 100, forming a protrusion relative to the surface of the main-gridless back-contact solar cell 100, by plating a conductive layer on the pad to form the welding point 310, it can be ensured that the height of the welding point 310 is higher than the height of the first insulating film segment 320 / the second insulating film segment 330, avoiding the height of the welding point 310 being lower than the height of the first insulating film segment 320 and affecting the welding effect. The height of the welding point 310 is the height of the conductive layer at the position of the main-gridless back-contact solar cell 100.

[0046] In the embodiment of the present application, the height of the first insulating film segment 320 / the second insulating film segment 330 is defined as 1 / 5 to 1 of the height of the welding point 310. For example, it can be 1 / 5, 3 / 5 or 1; it can ensure that the first insulating film segment 320 / the second insulating film segment 330 is not higher than the height of the welding point 310, making the welding point 310 protrude from the first insulating film segment 320 / the second insulating film segment 330, facilitating the contact and welding of the welding strip 400 with the welding point 310. The ratio of the height of the first insulating film segment 320 / the second insulating film segment 330 to the height of the welding point 310 is defined with a minimum value of 1 / 5, which can ensure that the height difference between the two is not too large and affect the overlap of the welding strip 400 with the first insulating film segment 320 / the second insulating film segment 330.

[0047] In one embodiment, as Figure 3 shown, the distance between the two second insulating film segments 330 on both sides of the welding point 310 is less than the width of the welding strip 400, and the spacing between the two second insulating film segments 330 on the opposite sides is 5 / 9 to 1 of the width of the welding strip 400.

[0048] The spacing between the two second insulating film segments 330 on the opposite sides is less than or equal to the width of the welding strip 400. The two second insulating film segments 330 are adhesively bonded to the welding strip 400, which can completely cover the welding point 310. A sealed space is formed between the welding strip 400, the two adjacent first insulating film segments 320, the two opposite second insulating film segments 330, and the surface of the main-gridless back-contact solar cell 100; completely blocking the encapsulation film 500 from penetrating into the inner side of the sealed space and contacting the welding point 310, thereby avoiding the de-welding of the welding point 310 and the welding strip 400 and improving the photoelectric conversion efficiency of the solar cell.

[0049] In the embodiments of the present application, the distance between two second insulating film segments 330 on opposite sides may be the distance between the side edges of the two second insulating film segments 330 close to the welding point 310.

[0050] To avoid the situation that the distance between two opposite second insulating films is too small, which may affect the contact between the solder strip 400 and the welding point 310, the distance between two second insulating film segments 330 on opposite sides is defined as 5 / 9 to 1 times the width of the solder strip 400, such as 5 / 9, 7 / 9 or 1. Defining the maximum distance between two second insulating film segments 330 on opposite sides as 1 times the width of the solder strip 400 can ensure the contact between the second insulating film segment 330 and the solder strip 400.

[0051] The width of the solder strip 400 can be understood as the dimension along the direction of the first grid line 210. When the solder strip 400 is in the shape of a slender cylinder, the width of the solder strip 400 is the diameter of the solder strip 400.

[0052] In one embodiment, as Figure 4 shown, the distance between two second insulating film segments 330 on both sides of the welding point 310 is greater than the width of the solder strip 400, and the distance between two second insulating film segments 330 on opposite sides is 1 to 2 times the width of the solder strip 400.

[0053] The distance between two second insulating film segments 330 on opposite sides of the welding point 310 is greater than the width of the solder strip 400. After the photo-curing adhesive or thermosetting adhesive is cured, it is fixed on opposite sides of the solder strip 400. When applying the encapsulation film 500, the volume of the encapsulation film 500 located between the solder strip 400 and the second insulating film segment 330 is small. During the lamination process, only the encapsulation film 500 in this section has a tendency to flow towards the welding point 310, and the lateral distance of this section is short. The distance that the flowing encapsulation film 500 flows out of its original position is short. Therefore, even if some infiltration occurs, it will be relatively small and thus not sufficient to cause the solder strip 400 to be desoldered from the welding point 310, thereby ensuring the photoelectric conversion efficiency of the solar cell.

[0054] The distance between two second insulating film segments 330 on opposite sides is 1 to 2 times the width of the solder strip 400, such as 1 time, 1.5 times or 2 times. To avoid the situation that the distance between two opposite second insulating films is too large, which may cause the encapsulation film 500 infiltrating between the solder strip 400 and the welding point 310 to desolder the solder strip 400 from the welding point 310, the maximum distance between two second insulating film segments 330 on opposite sides is defined as 2 times the width of the solder strip 400.

[0055] In one embodiment, the width of the solder strip 400 is 1 to 4 times the width of the welding point 310.

[0056] In the embodiments of the present application, the cross-section of the solder tape 400 needs to be large enough so that it can overlap with the second insulating film segments 330 on both sides while covering the welding point 310. And regardless of whether the distance between the two second insulating film segments 330 on the opposite sides is less than the width of the solder tape 400 or greater than the width of the solder tape 400, the solder tape 400 needs to cover the welding point 310 sufficiently, and form side walls with sufficient thickness when covering the welding point 310 to ensure its welding effect.

[0057] In one embodiment, on the first solder tape line, multiple grid lines include an edge first grid line 2101, and the edge first grid line 2101 is the first grid line located on the outer side among the multiple grid lines; at the welding point 310 close to the edge first grid line 2101, two second insulating film segments 330 on the opposite sides of the welding point 310 of the edge first grid line 2101 are adhesively bonded to surround the welding point 310 on the edge first grid line 2101.

[0058] It can be understood that on the second solder tape line, multiple grid lines include an edge second grid line 2201, and the edge second grid line 2201 is the second grid line located on the outer side among the multiple grid lines; at the welding point 310 close to the edge second grid line 2201, two second insulating film segments 330 on the opposite sides of the welding point 310 of the edge second grid line 2201 are adhesively bonded to surround the welding point 310 on the edge second grid line 2201.

[0059] In one example, as Figure 3 or Figure 4 shown, on the first solder tape line, the welding point on the edge first grid line 2101 is 310, and there is no first insulating film segment 320 in front of this welding point 310. Therefore, in order to prevent the encapsulation film 500 from infiltrating from the front of this welding point 310, a second insulating film can be coated around the front end of this welding point 310, and the coated second insulating film is connected to the two second insulating film segments 330 on both sides of the welding point 310 to form a closed city wall to block the infiltration of the encapsulation film 500.

[0060] In one example, as Figure 3 or Figure 4 shown, on the second solder tape line, the welding point on the edge second grid line 2201 is 310, and there is no first insulating film segment 320 behind this welding point 310. Therefore, in order to prevent the encapsulation film 500 from infiltrating from the back of this welding point 310, a second insulating film can be coated around the back end of this welding point 310, and the coated second insulating film is connected to the two second insulating film segments 330 on both sides of the welding point 310 to form a closed city wall to block the infiltration of the encapsulation film 500.

[0061] In one embodiment, the first insulating adhesive film segment 320 and the second insulating adhesive film segment 330 are made of the same material, and the first insulating adhesive film segment 320 and the second insulating adhesive film segment 330 are integrally formed.

[0062] In the embodiment of the present application, the first insulating adhesive film segment 320 and the second insulating adhesive film segment 330 can be cured first to form a closed wall, and then the welding ribbon 400 is welded to the welding point 310.

[0063] The materials of the first insulating adhesive film segment 320 and the second insulating adhesive film segment 330 can be adhesive film materials with lower fluidity than the encapsulation adhesive film in a lamination environment.

[0064] When coating the first insulating adhesive film segment 320 and the second insulating adhesive film segment 330, screen printing can be used. The screen plate of the screen printing includes mesh holes for forming the first insulating adhesive film segment 320 and the second insulating adhesive film segment 330, so that an integral structure of the first insulating adhesive film segment 320 and the second insulating adhesive film segment 330 is formed by one-time printing.

[0065] In one embodiment, the first insulating adhesive film segment 320 / the second insulating adhesive film segment 330 independently includes an acrylate adhesive, an epoxy resin adhesive or a silicone adhesive. The acrylate adhesive, the epoxy resin adhesive or the silicone adhesive has lower fluidity in a lamination environment, that is, it flows more slowly than the encapsulation adhesive film, can form a stable shape, and can be tightly bonded to the back-contact solar cell 100 without main grid after curing, so as to form a closed wall around the welding point 310.

[0066] In one embodiment, the second insulating adhesive film segment 330 is a thermosetting adhesive or a photocuring adhesive.

[0067] In an example, both the first insulating adhesive film segment 320 and the second insulating adhesive film segment 330 are thermosetting adhesives or photocuring adhesives. After coating the first insulating adhesive film or the second insulating adhesive film at a preset position on the surface of the back-contact solar cell 100 without main grid, curing is performed first to prevent the welding ribbon 400 from pressing down to contact the first grid line 210 / the second grid line 220 in the uncured state. During the lamination process, the thermosetting adhesive will be cured again; or the laminated part is subjected to photocuring treatment again to cure the photocuring adhesive again, so that it can adhere more tightly to the welding ribbon 400, improve its sealing performance, and further prevent the encapsulation adhesive film 500 from infiltrating.

[0068] In one example, the first insulating adhesive film segment 320 can be made by curing an acrylate adhesive, an epoxy resin adhesive, or a silicone rubber adhesive. The second insulating adhesive film segment 330 is a thermosetting adhesive or a photocuring adhesive. In this case, the first insulating adhesive film can be coated and cured to form the first insulating adhesive film segment 320 first, then the solder strip 400 is laid on the welding point 310 on the first solder strip line / second solder strip line and welded and fixed, and then the second insulating adhesive film is coated on opposite sides of the solder strip 400, so that the second insulating adhesive film adheres tightly to the solder strip after curing, which can further improve the sealing performance and prevent the encapsulation adhesive film 500 from infiltrating during the lamination process.

[0069] In one embodiment, as Figure 6 and Figure 7 shown, the second insulating adhesive film segment 330 is an arched structure with the middle part protruding away from the welding point 310.

[0070] As Figure 5 shown, the second insulating adhesive film segment 330 is a straight segment, adhesively bonded to two adjacent first insulating adhesive film segments 320 and surrounding the welding point 310.

[0071] The middle part of the second insulating adhesive film segment 330 protrudes away from the welding point 310, so that at the middle part of the second insulating adhesive film segment 330, the encapsulation adhesive film 500 starts to be blocked from flowing towards the welding point at a position farther from the welding point 310. During the lamination process, the length of the first insulating adhesive film segment 320 is longer than the width of the solder strip 400. Therefore, when the encapsulation adhesive film 500 flows, the flow rate of the encapsulation adhesive film 500 at the middle between two adjacent first insulating adhesive film segments 320 will be faster and will flow towards the welding point 310 faster. Therefore, in the embodiment of the present application, the setting that the middle part of the second insulating adhesive film segment 330 protrudes away from the welding point 310 can prevent the encapsulation adhesive film 500 at the middle between two adjacent first insulating adhesive film segments 320 from infiltrating to the welding point 310 to a greater extent.

[0072] In one embodiment, as Figure 7 shown, the arched structure is an arc with an arc transition, and the midpoint of the arched structure is the apex of the arc.

[0073] Based on considerations of convenient processing or the flow balance of the encapsulation film 500, the arched structure is set as an arc with a circular arc transition. The midpoint of the arched structure is the apex of the arc, which can prevent the encapsulation film 500 in the middle between two adjacent first insulating film segments 320 from flowing too quickly towards the welding point 310. Based on the arc-shaped setting of the second insulating film segment 330 with a circular arc transition and the midpoint of the arched structure being the apex of the arc, the flow rate of the encapsulation film 500 between two adjacent first insulating film segments 320 towards the second insulating film segment 330 is balanced, which can prevent the encapsulation film 500 from accumulating and being squeezed on the side of the second insulating film segment 330, resulting in local film being too thick and other situations that affect the quality of the solar cell product.

[0074] In the photovoltaic module provided by the embodiment of the present application, the solder strip and the welding point are not easily de-soldered, the photoelectric conversion efficiency is stable, and the product quality is good.

[0075] The embodiment of the present application provides a photovoltaic system, which includes the photovoltaic module in any implementation aspect of the above embodiment. The advantages possessed by the above photovoltaic module are also possessed by this photovoltaic system, which will not be elaborated here. The application fields of the above photovoltaic system are extensive, not limited to photovoltaic power stations, such as ground power stations, rooftop power stations, and water surface power stations, but also include various devices and apparatuses that utilize solar energy for power generation, such as user solar power supplies, solar street lamps, solar cars, and solar buildings. Of course, it can be understood that the application scenarios of the photovoltaic system are not limited to this, that is to say, the photovoltaic system can be applied in all fields that require solar energy for power generation. Taking the photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a busbar box, and an inverter. The photovoltaic array can be an array combination of multiple photovoltaic modules. For example, multiple photovoltaic modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the busbar box, and the busbar box can collect the current generated by the photovoltaic array. After the collected current flows through the inverter and is converted into alternating current required by the mains power grid, it is connected to the mains network to achieve solar power supply.

[0076] It should be noted that the terms used here are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present application. As used here, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the term "comprising" / "including" is used in this specification, it indicates the presence of features, steps, operations, devices, components / their combinations.

[0077] For ease of description, the orientation or positional relationship indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description. Without contrary explanation, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present application; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "on top of other devices or structures" will then be positioned as "below other devices or structures" or "beneath other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the relative spatial descriptions used here.

[0078] Unless otherwise clearly defined and limited, the terms such as "install", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0079] Unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature can include the direct contact between the first and second features, or can also include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher horizontal level than the second feature. The first feature being "beneath", "under" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature is at a lower horizontal level than the second feature.

[0080] Unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0081] It should also be noted that the "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures, or characteristics described in connection with that embodiment being included in at least one embodiment generally described in the present application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure, or characteristic in connection with any embodiment, it is intended that the implementation of such feature, structure, or characteristic in combination with other embodiments also fall within the scope of the present application.

[0082] In the above embodiments, the descriptions of the various embodiments each have their own emphases. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0083] It should also be noted that the above are only the preferred embodiments of the present application, and do not limit the scope of patent protection of the present application. Any equivalent structure or equivalent process transformation made using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, are equally included in the scope of patent protection of the present application.

Claims

1. A photovoltaic module, characterized in that: include: A busbar-free back-contact solar cell, wherein a plurality of grid lines are arranged on the surface of the busbar-free back-contact solar cell, wherein the plurality of grid lines include a first grid line and a second grid line with opposite polarities, and the plurality of the first grid lines and the plurality of the second grid lines are staggered at preset intervals; wherein a welding point is arranged on each of the first grid lines along a preset first welding strip line; An insulating unit, the insulating unit comprising a plurality of first insulating film segments and a plurality of second insulating film segments; along the first welding strip line, each of the second gate lines is coated with the first insulating film segment; the plurality of second insulating film segments are coated at positions close to the welding point, and two second insulating film segments on opposite sides of the welding point are bonded to two adjacent first insulating film segments; A welding strip is arranged along the first welding strip line and welded to the welding points on the plurality of first gate lines.

2. The photovoltaic module according to claim 1, characterized in that: The height of the first insulating film segment / the second insulating film segment is 1 / 5 to 1 of the height of the welding point.

3. The photovoltaic module according to claim 1, characterized in that: The distance between the two second insulating film segments on both sides of the welding point is 5 / 9 to 1 of the width of the welding strip.

4. The photovoltaic module according to claim 1, characterized in that: The distance between the two second insulating film segments on both sides of the welding point is 1 to 2 times the width of the welding strip.

5. The photovoltaic module according to any one of claims 1 to 4, characterized in that: On the first welding strip circuit, the multiple gate lines include an edge first gate line, which is the first gate line located on the outside of the multiple gate lines; near the welding point of the edge first gate line, a second insulating film segment is provided and is glued to two second insulating film segments on opposite sides of the welding point of the edge first gate line to surround the welding point on the edge first gate line.

6. The photovoltaic module according to any one of claims 1 to 4, characterized in that: The first insulating film segment and the second insulating film segment are made of the same material, and the first insulating film segment and the second insulating film segment are integrally formed.

7. The photovoltaic module according to any one of claims 1 to 4, characterized in that: The first insulating adhesive film segment and / or the second insulating adhesive film segment independently include acrylic adhesive, epoxy resin adhesive or organic silicone adhesive.

8. The photovoltaic module according to any one of claims 1 to 4, characterized in that: The second insulating adhesive film segment is a thermosetting adhesive or a light-curing adhesive.

9. The photovoltaic module according to any one of claims 1 to 4, characterized in that: The second insulating film segment is an arched structure with a middle portion protruding away from the welding point.

10. The photovoltaic module according to claim 9, characterized in that: The arched structure is an arc-shaped transition arc, and the midpoint of the arched structure is the top of the arc.

11. A photovoltaic system, characterized in that: A photovoltaic module comprising any one of claims 1 to 10.

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