Photovoltaic cell and manufacturing method and series welding method thereof
By setting bold parts on the first and second sides of the photovoltaic cell and setting bold parts on the gate line end, the problems of alignment offset and hidden cracks during welding are solved, and a stable and firm series welding effect is achieved.
Patent Information
- Application Number
- CN202510071785.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-16
- Publication Date
- 2025-04-18
AI Technical Summary
During the welding process of photovoltaic cells, how to introduce welding tape to another photovoltaic cell and weld it in series has become a major problem, which can easily lead to alignment deviation and hidden cracking.
A photovoltaic cell is designed, and the first and second sides of the first and second sides are respectively provided with a first gate line, a first bold part, a second gate line and a second bold part. By providing a first bold part at the first end of the first gate line and a second bold part at the second end of the second gate line, it is ensured that the series welding can be performed without additional welding tape during welding, and alignment offsets and hidden cracks are avoided.
It is achieved to avoid alignment offset and hidden cracking during photovoltaic cell welding, improve the stability and firmness of welding, and reduce the manufacturing difficulty.
Smart Images
Figure CN119855295A_ABST
Abstract
Description
Technical Field
[0001] The present application mainly relates to the field of photovoltaic cells, and in particular to a photovoltaic cell and a manufacturing method and a series welding method thereof. Background Art
[0002] The proportion of silver paste in battery cost is gradually increasing, which makes reducing the unit consumption of silver paste and improving battery efficiency an urgent problem to be solved in the industry. To solve the above problems, technicians in this field usually adopt the method of eliminating the main grid line on the photovoltaic cell. By eliminating the main grid line, the silver consumption can be reduced, and the welding strip can be directly welded on the fine grid line to achieve the overlap of the fine grid and the welding strip. This design reduces the shading area of the grid line, thereby improving the power output of the battery.
[0003] However, after the main grid line is removed, how to introduce the welding strip welded on the fine grid of one photovoltaic cell to another photovoltaic cell and weld it in series with the other photovoltaic cell becomes a big problem. This is because when the welding strip welded on the front fine grid is introduced to the back of another photovoltaic cell, it is easy to cause alignment deviation and hidden cracks. Summary of the invention
[0004] The present application aims to solve the technical problem that alignment deviation and hidden cracks are easily occurred when the welding strip of a photovoltaic cell is introduced into another photovoltaic cell, and provides a photovoltaic cell and its manufacturing method and a series welding method, which can avoid the alignment deviation and hidden cracks during welding.
[0005] In order to solve the above technical problems, the present application provides a photovoltaic cell, including a first surface and a second surface arranged opposite to each other, the first surface is provided with a first gate line and a first thickened portion, and the second surface is provided with a second gate line and a second thickened portion; the first gate line has a first end and a second end, the first thickened portion is arranged at the first end of the first gate line, and the width of the first thickened portion is greater than the width of the first gate line; the second gate line has a first end and a second end, the second thickened portion is arranged at the second end of the second gate line, and the width of the second thickened portion is greater than the width of the second gate line; wherein the photovoltaic cell has a first side and a second side arranged opposite to each other along a first direction, the first end of the first gate line and the first end of the second gate line are both close to the first side, and the second end of the first gate line and the second end of the second gate line are both close to the second side.
[0006] Optionally, the first surface of the photovoltaic cell has a first edge region and a second edge region that are oppositely disposed, and at least a portion of the first thickened portion is located in the first edge region; the second surface of the photovoltaic cell has a first edge region and a second edge region that are oppositely disposed, and at least a portion of the second thickened portion is located in the second edge region;
[0007] The first edge region of the first surface and the first edge region of the second surface are both close to the first side, and the second edge region of the first surface and the second edge region of the second surface are both close to the second side.
[0008] Optionally, the width of the first thickened portion and / or the second thickened portion gradually decreases along the first direction, or the width gradually increases along the first direction, or the width remains consistent and forms a rectangular pattern.
[0009] Optionally, the length range of the first thickened portion and the second thickened portion are both 300-1500 microns, and the width range of the first thickened portion and the second thickened portion are both 30-500 microns.
[0010] Optionally, the first gate lines are arranged at equal intervals along the second direction on the first surface, and the second gate lines are arranged at equal intervals along the second direction on the second surface, wherein the second direction is perpendicular to the first direction.
[0011] Optionally, the equal spacing between the first grid lines and the second grid lines is 2-6 mm.
[0012] Optionally, the width of the first gate line and the second gate line are both in the range of 10-50 micrometers.
[0013] Optionally, the projections of the first thickened portion and the second thickened portion on the same plane are axially symmetrical with respect to the central axis of the photovoltaic cell along the second direction, the same plane is parallel to the first surface or the second surface, and the second direction is perpendicular to the first direction. To solve the above technical problems, the present application also provides a method for manufacturing a photovoltaic cell, which is used to manufacture the photovoltaic cell as described above. The manufacturing method comprises the following steps:
[0014] Obtain a battery cell; make a first grid line on a first surface of the battery cell, and make a second grid line on a second surface of the battery cell; cut the battery cell to obtain a plurality of photovoltaic cells, wherein the photovoltaic cells have the cut first grid line on the first surface, and have the cut second grid line on the second surface; set a first thickened portion at a first end of the first grid line of the photovoltaic cell, wherein the width of the first thickened portion is greater than the width of the first grid line; set a second thickened portion at a second end of the second grid line of the photovoltaic cell, wherein the width of the second thickened portion is greater than the width of the second grid line; wherein the photovoltaic cell has a first side and a second side that are oppositely arranged along a first direction, wherein the first end of the first grid line and the first end of the second grid line are both close to the first side, and the second end of the first grid line and the second end of the second grid line are both close to the second side.
[0015] Optionally, the first surface of the photovoltaic cell has a first edge region and a second edge region arranged opposite to each other, and at least a portion of the first thickened portion is located in the first edge region; the second surface of the photovoltaic cell has a first edge region and a second edge region arranged opposite to each other, and at least a portion of the second thickened portion is located in the second edge region; wherein the first edge region of the first surface and the first edge region of the second surface are both close to the first side, and the second edge region of the first surface and the second edge region of the second surface are both close to the second side.
[0016] Optionally, before cutting the cell sheet, the manufacturing method further comprises: welding a first welding strip on a first grid line of the photovoltaic cell.
[0017] Optionally, after cutting the cell sheet, the manufacturing method includes: welding a second welding ribbon on a second grid line of the photovoltaic cell.
[0018] Optionally, before cutting the battery cells, the manufacturing method includes:
[0019] A first welding strip is welded on the first grid line of the battery cell; and a second welding strip is welded on the second grid line of the battery cell.
[0020] Optionally, the first welding strip is disposed on the first grid line and exposes at least part of the first thickened portion in the first edge region; the second welding strip is disposed on the second grid line and exposes at least part of the second thickened portion in the second edge region.
[0021] In order to solve the above technical problems, the present application also provides a photovoltaic cell series welding method, which is used for the photovoltaic cell as described above. The series welding method comprises the following steps:
[0022] A welding material is disposed on the first thickened portion or the second thickened portion of the first photovoltaic cell; a welding material is disposed on the first thickened portion or the second thickened portion of the second photovoltaic cell; the first thickened portion of the first photovoltaic cell is overlapped with the second thickened portion of the second photovoltaic cell, or the second thickened portion of the first photovoltaic cell is overlapped with the first thickened portion of the second photovoltaic cell; the first thickened portion of the first photovoltaic cell and the second thickened portion of the second photovoltaic cell are welded and solidified, or the second thickened portion of the first photovoltaic cell and the first thickened portion of the second photovoltaic cell are welded and solidified.
[0023] Optionally, in the serial welding method, the welding material is a conductive adhesive material or a conductive copper tape.
[0024] The present application provides a first grid line and a first thickened portion on the first surface of the photovoltaic cell, and a second grid line and a second thickened portion on the second surface, which is conducive to overlapping the first thickened portion of one photovoltaic cell with the second thickened portion of another photovoltaic cell in the subsequent process for series welding. During the welding process, there is no need to use an additional welding strip to connect the front of one photovoltaic cell to the bottom of another photovoltaic cell for series welding, thereby avoiding problems such as alignment deviation and hidden cracks. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The accompanying drawings are included to provide a further understanding of the present application. They are included and constitute a part of the present application. The accompanying drawings illustrate embodiments of the present application and together with the present specification serve to explain the principles of the present application. In the accompanying drawings:
[0026] Figure 1is a schematic diagram of a photovoltaic cell provided by an embodiment of the present application with the first surface facing upward;
[0027] Figure 2 is a schematic diagram of a photovoltaic cell provided by an embodiment of the present application with the second surface facing upward;
[0028] Figure 3 is a cross-sectional view along a first direction of a photovoltaic cell provided by an embodiment of the present application;
[0029] Figure 4 is another cross-sectional view along the first direction of a photovoltaic cell provided by an embodiment of the present application;
[0030] Figure 5 is a cross-sectional view along a first direction of a photovoltaic cell provided by an embodiment of the present application;
[0031] Figure 6 is a schematic diagram of photovoltaic cells connected in series according to an embodiment of the present application;
[0032] Figure 7 is a flow chart of a method for manufacturing a photovoltaic cell provided in one embodiment of the present application;
[0033] Figure 8 is another flow chart of a method for manufacturing a photovoltaic cell provided in one embodiment of the present application;
[0034] Fig. 9 is another flow chart of a method for manufacturing a photovoltaic cell provided in one embodiment of the present application;
[0035] Fig.10 It is a flow chart of a method for series welding of photovoltaic cells provided in one embodiment of the present application.
[0036] Reference numerals:
[0037] Photovoltaic cell, 100; first surface, 110; first grid line, 111; first thickened portion, 112; first welding strip, 113; first end of the first grid line, 114; second end of the first grid line, 115; second surface, 120; second grid line, 121; second thickened portion, 122; second welding strip, 123; first end of the second grid line, 124; second end of the second grid line, 125; first edge region, 130; second edge region, 140; first photovoltaic cell, 200; second photovoltaic cell, 300; first direction, x; second direction, y; third direction, z; first side of the photovoltaic cell, 150; second side of the photovoltaic cell, 160. DETAILED DESCRIPTION
[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.
[0039] As shown in this application, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list, and the method or device may also include other steps or elements.
[0040] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.
[0041] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.
[0042] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.
[0043] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.
[0044] The present application provides a photovoltaic cell, such as Figure 1-Figure 2 As shown, the photovoltaic cell 100 includes a first surface 110 and a second surface 120 arranged opposite to each other, the first surface 110 is provided with a first grid line 111 and a first thickened portion 112, and the second surface 120 is provided with a second grid line 121 and a second thickened portion 122; the first grid line 111 has a first end 114 and a second end 115, the first thickened portion 112 is arranged at the first end 114 of the first grid line 111, and the width of the first thickened portion 112 is greater than the width of the first grid line 111; the second grid line 121 has a first end 124 and a second end 115. The second end 125, the second thickened portion 122 is arranged at the second end 125 of the second gate line 121, and the width of the second thickened portion 122 is greater than the width of the second gate line 121; wherein the photovoltaic cell 100 has a first side 150 and a second side 160 that are relatively arranged along the first direction x, the first end 114 of the first gate line 111 and the first end 124 of the second gate line 121 are both close to the first side 150, and the second end 115 of the first gate line 111 and the second end 125 of the second gate line 121 are both close to the second side 160.
[0045] The present application does not limit the type of photovoltaic cell 100, and the photovoltaic cell 100 may be a thin film photovoltaic cell, a crystalline silicon photovoltaic cell, a heterojunction photovoltaic cell, etc. Figure 1-Figure 2 As shown, in some embodiments, the first surface 110 is the positive electrode of the photovoltaic cell 100, and the second surface 120 is the negative electrode of the photovoltaic cell 100. This application specification will be described as an example, but is not limited to this. The first grid line 111 and the second grid line 121 are set on the positive and negative electrodes of the photovoltaic cell 100, and are used to derive the generated current from the battery for external use. In some embodiments of the present application, the first grid line 111 and the second grid line 121 can be set as fine grid lines. The advantage of using fine grid lines is that the shading area can be reduced and the power generation efficiency of the photovoltaic cell 100 can be improved. In other embodiments, since the second grid line is set on the back of the photovoltaic cell 100 and does not participate in the collection of light energy, the second grid line can be set as a main grid line to enhance the conductive performance of the photovoltaic cell 100. The cross-sectional area of the main grid line is larger, so the resistance is smaller and it is easier to collect electrons.
[0046] In some embodiments of the present application, the first thickened portion 112 is arranged at the first end 114 of the first gate line 111, including: the position of the first end 114 of the first gate line 111 is adjacent to the first thickened portion 112, and a conductive connection is generated; or, the first thickened portion 112 covers the first end 114 of the first gate line 111, and there is an overlapping area between the first thickened portion 112 and the first end 114; or, the first thickened portion 112 is the first end 114 of the first gate line 111, and the first gate line 111 and the first thickened portion 112 are integrally formed. Similarly, the second thickened portion 122 is arranged at the second end 125 of the second gate line 121, including: the second end 125 of the second gate line 121 is adjacent to the second thickened portion 122 and produces a conductive connection; or, the second thickened portion 122 covers the second end 125 of the second gate line 121, and there is an overlapping area between the second thickened portion 122 and the second end 125; or, the second thickened portion 122 is the second end 125 of the second gate line 121, and the second gate line 121 and the second thickened portion 122 are integrally formed.
[0047] like Figure 1-Figure 2 As shown, in some embodiments of the present application, the width of the first thickened portion 112 is greater than the width of the first gate line 111, and the width of the second thickened portion 122 is greater than the width of the second gate line 121. The width refers to the width of the first gate line 111, the second gate line 121, the first thickened portion 112, and the second thickened portion 122. Figure 1 In addition, the photovoltaic cell 100 has an extended width in the second direction y shown. Figure 1 The photovoltaic cell 100 has a thickness in the third direction z, and the present application does not limit the thickness of the photovoltaic cell 100 .
[0048] In practical applications, multiple photovoltaic cells are connected in series to form a photovoltaic module. Figure 6 As shown, the first thickened portion 112 of the first photovoltaic cell 200 can overlap with the second thickened portion 122 of the second photovoltaic cell 300. Since the first thickened portion 112 is arranged at the positive pole and the second thickened portion 122 is arranged at the negative pole, the first photovoltaic cell 200 and the second photovoltaic cell 300 can be connected in series after overlapping. After overlapping, a welding operation can be performed to maintain the series connection of the first photovoltaic cell 200 and the second photovoltaic cell 300. A plurality of photovoltaic cells 100 are overlapped and welded together in sequence, so that a plurality of photovoltaic cells 100 can be connected in series.
[0049] According to the photovoltaic cell of the present application, the width of the first thickened portion 112 is greater than the width of the first grid line 111 and the width of the second thickened portion 122 is greater than the width of the second grid line 121, which can increase the contact area of the first thickened portion 112 and the second thickened portion 122, making the welding more secure; it can also avoid the problem that the first thickened portion 112 and the second thickened portion 122 are not easy to align or overlap due to their narrow width during welding. The overlapping and coordinated use of the first thickened portion 112 and the second thickened portion 122 of the present application can be partially overlapped, as long as there is an overlapping area to maintain the connectivity of the circuit. The advantage of partial overlap is that it reduces the difficulty of manufacturing and welding of the photovoltaic cell 100, and allows a certain range of errors in the width and specific setting position of the first thickened portion 112 and the second thickened portion 122.
[0050] like Figure 1-2 As shown, the photovoltaic cell 100 has a first side 150 and a second side 160 disposed opposite to each other along the first direction x, the first end 114 of the first grid line 111 and the first end 124 of the second grid line 121 are both close to the first side 150, and the second end 115 of the first grid line 111 and the second end 125 of the second grid line 121 are both close to the second side 160. Figure 1 and Figure 2As shown, the first end 114 of the first gate line 111 reaches the junction between the first surface 110 and the first side 150, and the second end 115 of the first gate line 111 reaches the junction between the first surface 110 and the second side 160. In other embodiments, the first end 114 of the first gate line 111 may not reach the junction between the first surface 110 and the first side 150, but is close to the junction, that is, there is a certain gap between the first end 114 and the junction; similarly, the second end 115 of the first gate line 111 may not reach the junction between the first surface 110 and the second side 160, but is close to the junction, that is, there is a certain gap between the second end 115 and the junction. The same is true for the relationship between the first end 124 and the second end 125 of the second gate line 121 and the first side 150 and the second side 160. According to such a configuration, when the first end and the second end of the grid line are respectively close to the first side 150 and the second side 160 , the overlapping area of the two photovoltaic cells 100 welded in series is small, thereby increasing the lighting area of the photovoltaic cells 100 .
[0051] In some embodiments of the present application, Figure 1-Figure 4 As shown, the first surface 110 of the photovoltaic cell 100 has a first edge area 130 and a second edge area 140 that are arranged opposite to each other, and at least a portion of the first thickened portion 112 is located in the first edge area 130; the second surface 120 has a first edge area 130 and a second edge area 140 that are arranged opposite to each other, and at least a portion of the second thickened portion 122 is located in the second edge area 140; wherein the first edge area 130 of the first surface 110 and the first edge area 130 of the second surface 120 are both close to the first side 150, and the second edge area 140 of the first surface 110 and the second edge area 140 of the second surface 120 are both close to the second side 160.
[0052] like Figure 1 and Figure 2 As shown, the first edge region 130 and the second edge region 140 are arranged opposite to each other, which means that the first edge region 130 and the second edge region 140 are respectively close to two opposite sides of the photovoltaic cell 100 , ie, the first side 150 and the second side 160 .
[0053] In some embodiments, the first edge region 130 and the second edge region 140 are axially symmetrical along the second direction y in the photovoltaic cell 100. That is, the first edge region 130 and the second edge region 140 can overlap each other when folded along the central axis of the photovoltaic cell 100 in the second direction y. At least a portion of the first thickened portion 112 is located in the first edge region 130, which means that the first thickened portion 112 can be completely contained in the first edge region 130, or it can exceed the first edge region 130 but the first thickened portion is partially located in the first edge region 130. Similarly, the second thickened portion 122 is at least partially located in the second edge region 140, which means that the first thickened portion 112 is at least partially located in the first edge region 130.
[0054] In practical applications, the first edge region 130 on the front of one photovoltaic cell 100 and the second edge region 140 on the back of another photovoltaic cell 100 can overlap, because the thickened portions are at least partially located in the first edge region 130 and the second edge region 140, so the two photovoltaic cells 100 can be connected in series when overlapping. The first edge region 130 and the second edge region 140 are respectively close to the first side 150 and the second side 160 of the photovoltaic cell 100, so the overlapping area of the photovoltaic cells 100 is small, which can increase the light collection area of the photovoltaic cells 100.
[0055] like Figure 5 As shown ( Figure 5 (also a cross-sectional view along the first direction x), in some embodiments of the present application, the first welding strip 113 and the second welding strip 123 are arranged on the photovoltaic cell 100. Among them, the first welding strip 113 is arranged on the first grid line 111, the first welding strip 113 and the first grid line 111 are in conductive contact, and at least part of the first thickened portion 112 located in the first edge area 130 is exposed, and the second welding strip 123 is arranged on the second grid line 121, the second welding strip 123 and the second grid line 121 are in conductive contact, and at least part of the second thickened portion 122 located in the second edge area 140 is exposed. That is, the first welding strip 113 can abut the end of the first thickened portion 112, or the first welding strip 113 can cover a part of the first thickened portion 112 to establish a conductive connection. Similarly, the second welding strip 123 can abut the end of the second thickened portion 122 and establish a conductive connection. Or the second welding strip 123 can cover a part of the first thickened portion 112 to establish a conductive connection. The welding strip is used to collect and transmit the current of the photovoltaic cell 100. The first welding strip 113 and the second welding strip 123 are respectively arranged on the first grid line 111 and the second grid line 121, which can increase the conductivity of the photovoltaic cell 100 and improve the ability of the photovoltaic cell 100 to collect current.
[0056] like Figure 5 As shown, in some embodiments of the present application, the first welding strip 113 and the second welding strip 123 are both ultra-thin welding strips, and the width of the welding strips ranges from 0.3 to 1.5 mm, for example, the width is 0.3, 0.35, 0.5, 0.75, 1, 1.5 mm, etc.
[0057] The present application does not limit the specific shapes of the first thickened portion 112 and the second thickened portion 122. Figure 1 and Figure 2As shown, in some embodiments of the present application, the first thickened portion 112 and the second thickened portion 122 are set to be rectangular, and their widths are consistent. In other embodiments of the present application, the first thickened portion 112 and the second thickened portion 122 can also be set to be a gradient pattern with a width that gradually decreases along the first direction x or gradually increases along the first direction x. For example, the first thickened portion and the second thickened portion can be a triangle or a trapezoid with a width that gradually increases along the first direction x, or a triangle or a trapezoid with a width that gradually decreases along the first direction x.
[0058] like Figure 1-Figure 4 As shown, in some embodiments of the present application, the first thickened portion 112 and the second thickened portion 122 have a length range and a width range. The length range of the first thickened portion 112 and the second thickened portion 122 is 300-1500 microns, and the width range is 30-500 microns. For example, the length is: 300, 400, 500, 600, 700, 800, 902, 1222, 1335, 1500 microns. The width is: 30, 40, 100, 250, 390, 450, 488, 500 microns. The range of the first thickened portion 112 and the second thickened portion 122 used in the photovoltaic cell 100 of the present application can be set accordingly according to the size of the actual photovoltaic cell 100.
[0059] like Figure 1-Figure 4 As shown, a plurality of first gate lines 111 are substantially parallel to each other on the first surface 110, and a plurality of second gate lines 121 are substantially parallel to each other on the second surface 120. The present application does not limit whether the plurality of first gate lines 111 or the plurality of second gate lines 121 are equally spaced.
[0060] In some embodiments, the first grid line 111 is arranged at equal intervals along the second direction y on the first face 110, and the second grid line 121 is arranged at equal intervals along the second direction y on the second face 120. In some embodiments of the present application, the equidistant spacing of the first grid line 111 and the second grid line 121 is 2-6 millimeters. For example, the equidistant spacing is 2, 3, 3.5, 4.5, 5, 5.5, 6 millimeters. The equidistant distance can select suitable spacing according to the photovoltaic cells 100 of different sizes. The first grid line 111 and the second grid line 121 arranged at equal intervals are conducive to the stability of the circuit of the photovoltaic cell 100, and are also more beautiful visually.
[0061] like Figure 1-Figure 4As shown, in some embodiments of the present application, the width range of the first grid line 111 and the second grid line 121 is 10-50 microns. For example, 10, 15, 20, 25, 30, 35, 40, 45, 50 microns. Its length can be the width of the photovoltaic cell 100 minus the width of the first edge area 130 and the width of the second edge area 140, or the width of the photovoltaic cell 100 minus the width of the first edge area 130, or the width of the photovoltaic cell 100. The width of the first edge area 130 and the width of the second edge area 140 can be equal.
[0062] like Figure 3-Figure 5 As shown, the projections of the first thickened portion 112 and the second thickened portion 122 on the same plane (not shown) are axially symmetrical with the central axis of the photovoltaic cell along the second direction y, wherein the same plane is parallel to the first surface or the second surface, and the second direction y is perpendicular to the first direction x. The axially symmetrical first thickened portion 112 and the second thickened portion 122 can maximize the contact area between the first photovoltaic cell 200 and the second photovoltaic cell 300 when they overlap, thereby ensuring the stability of the circuit connection.
[0063] The present application sets a first grid line 111 and a first thickened portion 112 on the first surface 110 of the photovoltaic cell 100, and sets a second grid line 121 and a second thickened portion 122 on the second surface 120, which is conducive to overlapping the first thickened portion 112 of one photovoltaic cell 100 with the second thickened portion 122 of another photovoltaic cell 100 for series welding in the subsequent process. During the welding process, there is no need to use an additional welding strip to connect the front of one photovoltaic cell to the bottom of another photovoltaic cell 100 for series welding, thereby avoiding problems such as alignment deviation and hidden cracks.
[0064] The present application provides a method for manufacturing a photovoltaic cell 100, which is used to manufacture the photovoltaic cell 100 as described above. Figure 7 As shown, the manufacturing method of this embodiment includes the following steps:
[0065] Step S710: Obtaining a battery cell;
[0066] Step S720: manufacturing a first gate line 111 on the first surface 110 of the battery cell, and manufacturing a second gate line 121 on the second surface 120 of the battery cell;
[0067] Step S730: cutting the cell sheet to obtain a plurality of photovoltaic cells 100, wherein the first surface 110 of the photovoltaic cell 100 has the cut first grid lines 111, and the second surface 120 of the photovoltaic cell 100 has the cut second grid lines 121;
[0068] Step S740: a first thickened portion 112 is provided at the first end 114 of the first grid line 111 of the photovoltaic cell 100, wherein the width of the first thickened portion 112 is greater than the width of the first grid line 111;
[0069] Step S750: a second thickened portion 122 is provided on the second end 125 of the second grid line 121 of the photovoltaic cell 100, wherein the width of the second thickened portion 122 is greater than the width of the second grid line 121; wherein the photovoltaic cell 100 has a first side 150 and a second side 160 which are arranged opposite to each other along a first direction x, the first end 114 of the first grid line 111 and the first end of the second grid line 121 are both close to the first side 150, and the second end 115 of the first grid line 111 and the second end 125 of the second grid line 121 are both close to the second side 160.
[0070] In some embodiments of the present application, in the manufacturing method of the photovoltaic cell 100, the first surface 110 of the photovoltaic cell 100 has a first edge area 130 and a second edge area 140 arranged opposite to each other, and at least a portion of the first thickened portion 112 is located in the first edge area 130; the second surface 120 of the photovoltaic cell 100 has a first edge area 130 and a second edge area 140 arranged opposite to each other, and at least a portion of the second thickened portion 122 is located in the second edge area 140; wherein the first edge area 130 of the first surface 110 and the first edge area 130 of the second surface 120 are both close to the first side 150, and the second edge area 140 of the first surface 110 and the second edge area 140 of the second surface 120 are both close to the second side 160.
[0071] In some embodiments of the present application, before cutting the battery cell in step S730, the manufacturing method further includes:
[0072] Step S721: welding the first welding ribbon 113 onto the first grid line 111 of the battery cell.
[0073] In some embodiments of the present application, after cutting the battery cell in step S730, the manufacturing method includes:
[0074] Step S731 : welding the second welding ribbon 123 on the second grid line 121 of the photovoltaic cell 100 .
[0075] In some embodiments of the present application, before cutting the battery cell in step S730, the manufacturing method includes:
[0076] Step S722: welding the first welding ribbon 113 on the first grid line 111 of the battery cell; welding the second welding ribbon 123 on the second grid line 121 of the battery cell.
[0077] In some embodiments of the present application, the first welding strip 113 is arranged on the first gate line 111 and exposes at least part of the first thickened portion 112 located in the first edge area 130; the second welding strip 123 is arranged on the second gate line 121 and exposes at least part of the second thickened portion 122 located in the second edge area 140.
[0078] The following references Figure 8 An embodiment of a method for manufacturing a photovoltaic cell 100 is described in combination with a specific example:
[0079] Step S801: Obtaining a battery cell;
[0080] Step S802: manufacturing a first gate line 111 on the first surface 110 of the battery cell, and manufacturing a second gate line 121 on the second surface 120 of the battery cell;
[0081] Step S803: welding the first welding ribbon 113 onto the first grid line 111 of the battery cell;
[0082] Step S804: welding the second welding strip 123 on the second grid line 121 of the battery cell;
[0083] Step S805: cutting the cell sheet to obtain a plurality of photovoltaic cells 100, wherein the first surface 110 of the photovoltaic cell 100 has the cut first grid lines 111, and the second surface 120 of the photovoltaic cell 100 has the cut second grid lines 121;
[0084] Step S806: a first thickened portion 112 is provided on the first end 114 of the first grid line 111 of the photovoltaic cell 100, wherein the width of the first thickened portion 112 is greater than the width of the first grid line 111;
[0085] Step S807 : a second thickened portion 122 is provided on the second end 125 of the second grid line 121 of the photovoltaic cell 100 , wherein the width of the second thickened portion 122 is greater than the width of the second grid line 121 .
[0086] The following references Fig. 9 Another embodiment of the method for manufacturing the photovoltaic cell 100 is described in conjunction with another specific example:
[0087] Step S901: Obtaining a battery cell;
[0088] Step S902: manufacturing a first gate line 111 on the first surface 110 of the battery cell, and manufacturing a second gate line 121 on the second surface 120 of the battery cell;
[0089] Step S903: welding the first welding ribbon 113 on the first grid line 111 of the battery cell;
[0090] Step S904: cutting the cell sheet to obtain a plurality of photovoltaic cells 100 , wherein the first surface 110 of the photovoltaic cell 100 has the cut first grid lines 111 , and the second surface 120 of the photovoltaic cell 100 has the cut second grid lines 121 ;
[0091] Step S905: welding the second welding strip 123 on the second grid line 121 of the photovoltaic cell 100;
[0092] Step S906: a first thickened portion 112 is provided at the first end 114 of the first grid line 111 of the photovoltaic cell 100, wherein the width of the first thickened portion 112 is greater than the width of the first grid line 111;
[0093] Step S907 : a second thickened portion 122 is provided at the second end 125 of the second grid line 121 of the photovoltaic cell 100 , and a width of the second thickened portion 122 is greater than a width of the first grid line 111 .
[0094] The present application sets a first grid line 111 and a first thickened portion 112 on the first surface 110 of the photovoltaic cell 100, and sets a second grid line 121 and a second thickened portion 122 on the second surface 120, which is conducive to overlapping the first thickened portion 112 of one photovoltaic cell 100 with the second thickened portion 122 of another photovoltaic cell 100 for series welding in the subsequent process. During the welding process, there is no need to use an additional welding strip to connect the front of one photovoltaic cell to the bottom of another photovoltaic cell 100 for series welding, thereby avoiding problems such as alignment deviation and hidden cracks.
[0095] refer to Fig.10 As shown, the present application also provides a series welding method of photovoltaic cells 100, which is applied to the photovoltaic cells 100 as described above, and the series welding method includes:
[0096] Step S1001: placing welding material on the first thickened portion 112 or the second thickened portion 122 of the first photovoltaic cell 200;
[0097] Step S1002: placing welding material on the first thickened portion 112 or the second thickened portion 122 of the second photovoltaic cell 300;
[0098] Step S1003: overlapping the first thickened portion 112 of the first photovoltaic cell 200 with the second thickened portion 122 of the second photovoltaic cell 300, or overlapping the second thickened portion 122 of the first photovoltaic cell 200 with the first thickened portion 112 of the second photovoltaic cell 300;
[0099] Step S1004 : welding and curing the first thickened portion 112 of the first photovoltaic cell 200 and the second thickened portion 122 of the second photovoltaic cell 300 , or welding and curing the second thickened portion 122 of the first photovoltaic cell 200 and the first thickened portion 112 of the second photovoltaic cell 300 .
[0100] In some embodiments of the present application, the welding material may be a conductive adhesive material or a conductive copper strip. By overlapping and welding the first thickened portions 112 of a plurality of photovoltaic cells 100 and the second thickened portions 122 of a plurality of photovoltaic cells 100, a plurality of photovoltaic cells 100 can be connected in series to obtain photovoltaic cells 100 with different output voltages and output powers. The photovoltaic cells 100 obtained in series are fixed by packaging and frames to enhance the stability of the photovoltaic cells 100.
[0101] According to the series welding method provided by the present application, by setting the first grid line 111 and the first thickened portion 112 on the first surface 110 of the photovoltaic cell 100, and setting the second grid line 121 and the second thickened portion 122 on the second surface 120, it is convenient to overlap the first thickened portion 112 of one photovoltaic cell 100 with the second thickened portion 122 of another photovoltaic cell 100 in the subsequent process for series welding. During the welding process, there is no need to use an additional welding strip to connect the front of one photovoltaic cell to the bottom of another photovoltaic cell 100 for series welding, thereby avoiding problems such as alignment deviation and hidden cracks.
[0102] The present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or multiple times in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.
[0103] It should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more embodiments of the invention, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned. In fact, the features of the embodiment are less than all the features of the single embodiment disclosed above.
[0104] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in this application are approximate values, which may change according to the required characteristics of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining the digits. Although the numerical domains and parameters used to confirm the breadth of the range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values is as accurate as possible within the feasible range.
Claims
1. A photovoltaic cell, characterized in that: It comprises a first surface and a second surface which are arranged opposite to each other, wherein the first surface is provided with a first grid line and a first thickened portion, and the second surface is provided with a second grid line and a second thickened portion; The first gate line has a first end and a second end, the first thickened portion is arranged at the first end of the first gate line, and a width of the first thickened portion is greater than a width of the first gate line; The second gate line has a first end and a second end, the second thickened portion is arranged at the second end of the second gate line, and a width of the second thickened portion is greater than a width of the second gate line; The photovoltaic cell has a first side and a second side arranged opposite to each other along a first direction, the first end of the first grid line and the first end of the second grid line are both close to the first side, and the second end of the first grid line and the second end of the second grid line are both close to the second side.
2. The photovoltaic cell according to claim 1, characterized in that The first surface has a first edge region and a second edge region that are arranged opposite to each other, and at least a portion of the first thickened portion is located in the first edge region; The second surface has a first edge region and a second edge region that are arranged opposite to each other, and at least a portion of the second thickened portion is located in the second edge region; The first edge region of the first surface and the first edge region of the second surface are both close to the first side, and the second edge region of the first surface and the second edge region of the second surface are both close to the second side.
3. The photovoltaic cell according to claim 2, characterized in that The width of the first thickened portion and / or the second thickened portion gradually decreases along the first direction, or the width gradually increases along the first direction, or the width remains consistent in a rectangular pattern.
4. The photovoltaic cell according to claim 3, characterized in that: The lengths of the first thickened portion and the second thickened portion are both in the range of 300-1500 microns, and the widths are both in the range of 30-500 microns.
5. The photovoltaic cell according to claim 1, characterized in that: The first gate lines are arranged at equal intervals along a second direction on the first surface, and the second gate lines are arranged at equal intervals along the second direction on the second surface, wherein the second direction is perpendicular to the first direction.
6. The photovoltaic cell according to claim 5, characterized in that: The equal intervals between the first grid lines and the second grid lines are both 2-6 mm.
7. The photovoltaic cell according to claim 1, characterized in that The width of the first gate line and the second gate line are both in the range of 10-50 micrometers.
8. The photovoltaic cell according to claim 1, characterized in that: The projections of the first thickened portion and the second thickened portion on the same plane are axially symmetric with respect to the central axis of the photovoltaic cell along the second direction, wherein the same plane is parallel to the first surface or the second surface, and the second direction is perpendicular to the first direction.
9. A method for manufacturing a photovoltaic cell, characterized in that: include: Get the battery cell; Making a first gate line on a first surface of the battery cell, and making a second gate line on a second surface of the battery cell; Cutting the cell sheet to obtain a plurality of photovoltaic cells, wherein the photovoltaic cells have cut first grid lines on the first surface and cut second grid lines on the second surface; A first thickened portion is provided at a first end of a first grid line of the photovoltaic cell, wherein a width of the first thickened portion is greater than a width of the first grid line; A second thickened portion is provided at a second end of a second grid line of the photovoltaic cell, wherein a width of the second thickened portion is greater than a width of the second grid line; The photovoltaic cell has a first side and a second side arranged opposite to each other along a first direction, the first end of the first grid line and the first end of the second grid line are both close to the first side, and the second end of the first grid line and the second end of the second grid line are both close to the second side.
10. The manufacturing method according to claim 9, characterized in that: The first surface of the photovoltaic cell has a first edge region and a second edge region that are arranged opposite to each other, and at least a portion of the first thickened portion is located in the first edge region; The second surface of the photovoltaic cell has a first edge region and a second edge region that are arranged opposite to each other, and at least a part of the second thickened portion is located in the second edge region; The first edge region of the first surface and the first edge region of the second surface are both close to the first side, and the second edge region of the first surface and the second edge region of the second surface are both close to the second side.
11. The manufacturing method according to claim 9, characterized in that: Before cutting the battery cell, the manufacturing method further comprises: A first welding strip is welded on the first grid line of the battery cell.
12. The manufacturing method according to claim 9, characterized in that: After cutting the battery cell, the manufacturing method includes: A second welding strip is welded on the second grid line of the photovoltaic cell.
13. The manufacturing method according to claim 9, characterized in that: Before cutting the battery cell, the manufacturing method includes: Welding a first welding strip on the first grid line of the battery cell; and A second welding strip is welded on the second grid line of the battery cell.
14. The manufacturing method according to any one of claims 11 to 13, characterized in that: A first welding strip is disposed on the first grid line, and exposes at least a portion of the first thickened portion in the first edge region; A second welding strip is disposed on the second grid line and exposes at least a portion of the second thickened portion in the second edge region.
15. A method for series welding of photovoltaic cells, characterized in that: The series welding method is applied to the photovoltaic cell according to any one of claims 1 to 8, and the series welding method comprises: Disposing welding material on the first thickened portion or the second thickened portion of the first photovoltaic cell; Disposing welding material on the first thickened portion or the second thickened portion of the second photovoltaic cell; Overlapping the first thickened portion of the first photovoltaic cell with the second thickened portion of the second photovoltaic cell, or overlapping the second thickened portion of the first photovoltaic cell with the first thickened portion of the second photovoltaic cell; The first thickened portion of the first photovoltaic cell and the second thickened portion of the second photovoltaic cell are welded and solidified, or the second thickened portion of the first photovoltaic cell and the first thickened portion of the second photovoltaic cell are welded and solidified.
16. The tandem welding method according to claim 15, characterized in that: The welding material is a conductive adhesive material or a conductive copper tape.