Shingle assembly and method of manufacturing the same

Abstract

The present application relates to a kind of shingled assembly and its manufacturing method.Therein, the top surface and / or bottom surface of each solar cell piece in the shingled assembly is provided with: a plurality of sub-grid lines, each sub-grid line extends along the first direction;Shingled conductive structure, shingled conductive structure on the top surface and shingled conductive structure on the bottom surface are respectively located at two ends of the second direction of solar cell piece, shingled conductive structure is configured so that when a plurality of solar cell pieces are arranged in shingled manner, adjacent solar cell pieces are electrically connected through shingled conductive structure;A plurality of conductive strips, each conductive strip and a plurality of sub-grid lines, shingled conductive structure are in contact.The solar cell piece in the shingled assembly of the present application can avoid or reduce the efficiency loss caused by cell piece slicing, and can also avoid the problem of sub-grid line being too long and transmission capacity being insufficient.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy, in particular to a shingled assembly and a manufacturing method thereof. BACKGROUND

[0002] Climate is one of the important factors of human living environment, and is also an important resource for human production and life. With the expansion of human survival activities, human activities have had an increasingly greater impact on climate change. With the depletion of fossil energy, climate impact has occurred, especially greenhouse gas emissions have had a serious impact on the sustainable development of global human health.

[0003] With the accelerated consumption of global conventional fossil energy such as coal, oil, and natural gas, the ecological environment is deteriorating, and in particular, the increasingly severe global climate change caused by greenhouse gas emissions has seriously threatened the sustainable development of human society. Countries around the world have formulated their own energy development strategies to cope with the finiteness of conventional fossil energy resources and the environmental problems caused by their development and utilization. Solar energy, with its reliability, safety, universality, longevity, environmental protection, and resource adequacy, has become one of the most important renewable energy sources and is expected to become the main pillar of future global power supply.

[0004] Semiconductors are used in integrated circuits, consumer electronics, communication systems, photovoltaic power generation, lighting, high-power power conversion, and other fields. In recent years, the global development and utilization of green energy have been increasing. Under the background of vigorously promoting and using solar green energy, shingled assemblies use small current and low loss electrical principles (the power loss of a photovoltaic assembly is proportional to the square of the operating current) to greatly reduce the power loss of the assembly. The shingled assembly uses the intercell spacing to lay more cells to generate electricity, resulting in higher energy density per unit area.

[0005] The current shingling process mainly has the following ways: a large piece of cell sheet is cut into small pieces multiple times, and each small piece forms a shingled assembly in a shingled manner. The number of cutting knives for the cell sheet is large, and the cutting loss is large, which affects the overall power and efficiency of the assembly. A large piece of cell sheet is only cut once to form a half-piece structure, and the half-piece structure is shingled to form a shingled assembly. However, such a process has problems such as a too long transmission distance of the carrier sub-grid in the cell sheet or poor longitudinal current collection and transmission capacity of the printed silver paste main grid.

[0006] Therefore, it is necessary to provide a shingled assembly and a manufacturing method thereof to at least partially solve the above problems. SUMMARY

[0007] The present application aims to provide a shingled assembly and a manufacturing method thereof. The solar cell sheet of the present application can adopt a large piece of cell sheet or a half piece structure obtained by cutting the cell sheet once, thereby avoiding or reducing the efficiency loss caused by cell sheet cutting, and the cell sheet is provided with a conductive body crossing the sub-grid line to transmit the carriers from the sub-grid line to the main grid line, thereby avoiding the problem of excessively long sub-grid line and insufficient transmission capacity. The solar cell sheet of the present application can also be a small piece structure obtained by equally dividing the whole piece of cell sheet by N (N is an integer of 3-12).

[0008] According to an aspect of the present application, a shingled assembly is provided, which comprises a cell string arranged in a shingled manner by solar cell sheets, the top surface and the bottom surface of each solar cell sheet are planes defined by a first direction and a second direction, the first direction and the second direction are substantially perpendicular, and each solar cell sheet is provided with:

[0009] a plurality of sub-grid lines, each sub-grid line extends along the first direction;

[0010] a shingled conductive structure; and

[0011] a plurality of conductive strips, the plurality of conductive strips and the plurality of sub-grid lines are cross arranged, and each conductive strip is in contact with the shingled conductive structure,

[0012] wherein the shingled conductive structure on the top surface and the shingled conductive structure on the bottom surface are respectively located at two ends of the solar cell sheet in the second direction, so that in the cell string, the electrical connection between adjacent solar cell sheets is realized through the contact of the shingled conductive structure.

[0013] In an embodiment, each conductive strip extends along the second direction.

[0014] In an embodiment, the size of the solar cell sheet in the first direction is greater than or equal to the size in the second direction.

[0015] In an embodiment, the solar cell sheet is a whole piece of cell sheet without being split, a half piece obtained by splitting the whole piece of cell sheet, or an N (N is an integer of 3-12) equal division piece obtained by equally dividing the whole piece of cell sheet by N.

[0016] In an embodiment, the shingled conductive structure comprises a main grid line extending along the first direction.

[0017] In an embodiment, the main grid line comprises a linear main grid line body and a contact portion in contact with the conductive strip, and the size of the contact portion in the first direction is reduced from the main grid line body to a position away from the main grid line body.

[0018] In an embodiment, the main grid line is continuously or discontinuously arranged in the first direction.

[0019] In an embodiment, the shingled conductive structure comprises a conductive strip end region at an end of the solar cell in the second direction, the conductive strip end region has a projected area on the surface of the solar cell that is larger than a projected area of the conductive strip on the surface of the solar cell, and the conductive strip end region can be circular or elliptical.

[0020] In an embodiment, the cross section of the conductive strip comprises at least one of a circle, a semi-circle, a trapezoid, a triangle, and an ellipse.

[0021] In an embodiment, the number of conductive strips on the top surface of the solar cell is 2-54, and the number of conductive strips on the bottom surface of the solar cell is 2-54.

[0022] In an embodiment, a strong current flow node is provided at the contact position of the sub-grid line and the conductive strip.

[0023] In an embodiment, the conductive strip is fixed on the surface of the solar cell by a connecting agent, and the connecting agent is:

[0024] at least one of an acrylic resin, an epoxy resin, and a polyurethane resin; or

[0025] an organic silicon or an epoxy connecting agent; or

[0026] one of a double-sided tape, a pressure sensitive tape, and a pressure sensitive glue.

[0027] In an embodiment, the conductive strip is fixed on the surface of the solar cell by a conductive connecting agent.

[0028] In an embodiment, adjacent solar cells in a cell string are fixed together by a connecting agent, and the connecting agent is:

[0029] the connecting agent comprises at least one of an acrylic resin, an epoxy resin, and a polyurethane resin; or

[0030] the connecting agent comprises an organic silicon or an epoxy non-conductive connecting agent; or

[0031] the connecting agent comprises one of a double-sided tape, a pressure sensitive tape, and a pressure sensitive glue.

[0032] In an embodiment, adjacent solar cells in a cell string are fixed together by a connecting agent, and the connecting agent is a conductive connecting agent.

[0033] In an embodiment, the conductive connecting agent is provided at a conductive connection region between adjacent solar cells, or the non-conductive connecting agent is not provided at the conductive connection region between adjacent solar cells.

[0034] In one embodiment, the connecting agent is disposed around the conductive strip.

[0035] In one embodiment, the shingled conductive structures are discontinuous in the first direction, and the shingled conductive structures on the top surface of the solar cell and the shingled conductive structures on the bottom surface of the solar cell are aligned in the second direction.

[0036] In one embodiment, the shingled conductive structures on one of the top surface and the bottom surface of each solar cell are main grid lines, and the shingled conductive structures on the other of the top surface and the bottom surface are conductive connecting portions.

[0037] According to another aspect of the present application, there is provided a method of manufacturing the shingled assembly of any one of the above aspects, the method comprising the steps of manufacturing a plurality of solar cells and shingling the plurality of solar cells, wherein in the step of manufacturing the plurality of solar cells:

[0038] the step of shingling the plurality of solar cells does not include the step of shingling the solar cells along a plurality of straight lines; or

[0039] the step of shingling the plurality of solar cells includes the step of shingling each of the solar cells along only one straight line at a time.

[0040] the step of shingling the plurality of solar cells includes the step of shingling the solar cells into N equal parts, N being an integer from 3 to 12.

[0041] In one embodiment, the step of manufacturing the plurality of solar cells includes the step of applying a conductive strip to the solar cell wafer, and the step of applying the conductive strip includes:

[0042] lapping the conductive strip on a surface of the solar cell wafer; or

[0043] welding the conductive strip on a surface of the solar cell wafer; or

[0044] fixing the conductive strip on a surface of the solar cell wafer by a conductive or non-conductive connecting agent.

[0045] In one embodiment, the step of manufacturing the plurality of solar cells includes the step of applying a conductive strip to the solar cell wafer by a welding method, and when a heterojunction low-temperature process is used, a low-melting-point alloy is selected as the welding material.

[0046] In one embodiment, the step of manufacturing the plurality of solar cells includes the step of producing the solar cell wafer, and the step of producing the solar cell wafer includes a photo-injection process, and the photo-injection process and the low-temperature welding step are performed simultaneously.

[0047] In one embodiment, the step of manufacturing the plurality of solar cells includes the step of simultaneously or stepwise forming the main grid lines and the conductive strips on a surface of the solar cell wafer using an electroplating process.

[0048] In one embodiment, the plating material in the electroplating process is a material comprising copper.

[0049] In one embodiment, the method further comprises the step of applying a connecting agent between adjacent solar cell pieces, the connecting agent being an electrically conductive connecting agent or a non-conductive connecting agent.

[0050] In one embodiment, the method comprises fixing the conductive strip on the surface of the solar cell piece using an electrically conductive connecting agent or a non-conductive connecting agent, which comprises:

[0051] applying the connecting agent on the conductive strip and then placing the conductive strip on the solar cell piece; or

[0052] applying the connecting agent on the solar cell piece and then placing the conductive strip on the solar cell piece.

[0053] The shingled module and the manufacturing method thereof have the following advantages: compared with multiple slices, the solar cell piece of the present application has smaller cutting loss, can greatly increase the efficiency of the shingled module, and reduce the cost; compared with the shingled module provided with a conventional sub-grid line, the shingled module of the present application can effectively reduce the current longitudinal long-distance transmission loss and increase the module efficiency; compared with the conventional welding half-piece process, the present application can effectively reduce the stress and the broken piece rate of the module, and can be compatible with the thinning development of the battery in the later period. BRIEF DESCRIPTION OF DRAWINGS

[0054] For better understanding of the above and other objects, features, advantages and functions of the present application, reference should be made to the preferred embodiments thereof illustrated in the accompanying drawings. The same reference numerals in the drawings designate the same components throughout. It should be understood by those skilled in the art that the drawings are intended to schematically illustrate the preferred embodiments of the present application, and have no limiting effect on the scope of the present application, and the components in the drawings are not drawn to scale.

[0055] Figure 1 a top surface schematic view of a solar cell piece of the first embodiment of the present application is shown;

[0056] Figure 2 is a partial enlarged view of part A in Figure 1

[0057] Figure 3 a bottom surface schematic view of a solar cell piece in Figure 1

[0058] Figure 4 is a partial schematic view of a shingled module according to the preferred embodiment of the present application;

[0059] Figure 5 is a partial schematic view of a shingled module according to the preferred embodiment of the present application; Figure 4 ​​a cross-sectional view taken along the B-B line in FIG. 1;

[0060] Figure 6 is a schematic view of a top surface of a solar cell according to a first embodiment of the present application; Figure 5 is a schematic view of current transmission paths of two adjacent solar cells in FIG. 1;

[0061] Figure 7 is a schematic view of a top surface of a solar cell according to a second embodiment of the present application;

[0062] Figure 8 is a schematic view of a top surface of a solar cell according to a third embodiment of the present application;

[0063] Figure 9 is a schematic view of a top surface of a solar cell according to a fourth embodiment of the present application;

[0064] Figure 10 is a schematic view of a top surface of a solar cell according to a fifth embodiment of the present application.

[0065] Reference Signs:

[0066] 100, 200, 300, 400, 500 solar cell

[0067] 1 base sheet

[0068] 13 first edge

[0069] 14 second edge

[0070] 11 third edge

[0071] 12 fourth edge

[0072] 2, 202, 302, 402, 502 sub-grid line

[0073] 3, 403 main grid line

[0074] 31 main grid line body

[0075] 32 contact portion

[0076] 4, 204, 304, 404, 504 conductive strip

[0077] 101 first solar cell

[0078] 102 second solar cell

[0079] 103 third solar cell

[0080] 203, 303 conductive connection portion

[0081] 305, 405, 505 additional conductive connection portion

[0082] 503 end region of the conductive strip

[0083] 506 application position of the non-conductive connecting agent DETAILED DESCRIPTION

[0084] With reference to the drawings, a specific embodiment of the present application will be described in detail. The preferred embodiment described herein is merely illustrative of the principles of the present application and other ways of implementing the present application can be conceived by those skilled in the art based on the preferred embodiment, which also fall within the scope of the present application.

[0085] The present application provides a shingled assembly and a manufacturing method thereof. Figures 1-6 Some preferred embodiments of the shingled assembly provided by the present application are shown. It is first noted that the first direction and the second direction mentioned herein are two directions substantially perpendicular to each other, and the plane defined by the first direction and the second direction is parallel to the top surface and the bottom surface of the solar cell sheet. The first direction and the second direction are respectively shown by D1 and D2 in the drawings.

[0086] Firstly, with reference to Figure 1 In a preferred embodiment of the present application, the solar cell sheet 100 includes a base sheet 1 and conductive structures such as grid lines on the base sheet 1. The base sheet 1 is substantially rectangular with chamfered corners and has a first edge 13, a second edge 14 extending along the first direction D1, and a third edge 11, a fourth edge 14 extending along the second direction D2. A plurality of sub-grid lines 2, shingled conductive structures, and a plurality of conductive strips 4 are provided on the top surface of the solar cell sheet 100. In this embodiment, the shingled conductive structures are main grid lines 3. Among them, on the top surface of the solar cell sheet 100, the plurality of sub-grid lines 2 and the main grid lines 3 all extend along the first direction D1, that is, the plurality of sub-grid lines 2 and the main grid lines 3 are substantially parallel. On the top surface of the solar cell sheet 100, each conductive strip 4 extends along the second direction D2, and each conductive strip 4 and the plurality of sub-grid lines 2 and the main grid lines 3 are in contact. That is, the plurality of conductive strips 4 and the plurality of sub-grid lines 2 are arranged perpendicularly.

[0087] The bottom surface of the solar cell sheet 100 also has a similar structure. With reference to Figure 3 , the bottom surface of the solar cell sheet 100 also has a plurality of sub-grid lines 2, main grid lines 3, and a plurality of conductive strips 4. Among them, on the bottom surface of the solar cell sheet 100, the plurality of sub-grid lines 2 and the main grid lines 3 all extend along the first direction D1. On the bottom surface of the solar cell sheet 100, each conductive strip 4 extends along the second direction D2, and each conductive strip 4 and the plurality of sub-grid lines 2 and the main grid lines 3 are in contact.

[0088] Among them, with reference toFigure 1 The main busbar 3 on the top surface of the solar cell 100 extends along the second edge 14; refer to Figure 3 The main busbar 3 on the bottom surface of the solar cell 100 extends along the first edge 13. In other words, the main busbar 3 on the top surface and the bottom surface of the solar cell 100 is located at two ends in the second direction D2 of the solar cell 100, respectively. And when the plurality of solar cells 100 are arranged in a shingled manner, the electrical connection between adjacent solar cells 100 is achieved by the contact between the main busbars 3 facing each other.

[0089] The width and the arrangement of the sub-busbar 2 of the present embodiment are similar to those of the conventional solar cell; the width and the arrangement of the main busbar 3 of the present embodiment are similar to those of the conventional solar cell; the conductive strip 4 of the present embodiment is neither identical nor similar to the sub-busbar of the conventional solar cell, nor is it identical nor similar to the main busbar of the conventional solar cell. For example, the width of the conductive strip 4 can be between the width of the conventional main busbar and the width of the conventional sub-busbar.

[0090] The conductive strip 4 is arranged on the surface of the cell by physical lapping, welding, coating connection or conductive bonding, and the conductive strip 4 and the sub-busbar 2 and the main busbar 3 can be effectively electrically connected. When the conductive strip 4 is arranged by welding, a suitable alloy material for welding can be used. For example, when a cell using a low-temperature process such as a heterojunction cell (HIT) is used, a low-melting-point alloy material can be used for welding; when a cell using a high-temperature process is used, a high-melting-point alloy material can be used for welding.

[0091] The state in which the plurality of solar cells 100 are arranged in a shingled manner is shown in Figure 4 and Figure 5 For convenience of description, the three solar cells 100 arranged adjacent to each other in a shingled manner in Figure 4 are referred to as the first solar cell 101, the second solar cell 102 and the third solar cell 103, respectively. The cross-sectional view of the first solar cell 101 and the second solar cell 102 is shown in Figure 5 Referring to Figure 5 , the conductive strip 4 on the top surface of the first solar cell 101 electrically connects each sub-busbar 2 and main busbar 3, and the conductive strip 4 on the bottom surface of the second solar cell 102 electrically connects each sub-busbar 2 and main busbar 3. The main busbar 3 on the top surface of the first solar cell 101 and the main busbar 3 on the bottom surface of the second solar cell 102 are aligned with each other and electrically contact each other.

[0092] The carrier transport direction of the first solar cell 101 and the second solar cell 102 is shown in Figure 6The flow of the carriers is indicated by arrows. Referring to Figure 6 The carriers transported by the sub bus lines 2 on the top surface of the first solar cell 101 are transported to the main bus lines 3 in contact with the second solar cell 102 through the conductive strips 4, and the carriers transported by the sub bus lines 2 on the bottom surface of the second solar cell 102 are transported to the main bus lines 3 in contact with the third solar cell 103 (not shown in the figure) through the conductive strips 4. The carriers of the first solar cell 101, the second solar cell 102 and the third solar cell 103 form a flow direction from the first solar cell 101 to the second solar cell 102. Figure 6

[0093] Generally, the solar cell 100 in the conventional tile assembly is mostly small pieces cut from a whole cell, and each whole cell can be cut into, for example, 4, 8, 16 small pieces of cells. The solar cell 100 in the present embodiment is different from such small pieces of cells. The solar cell 100 in the present embodiment can be a whole cell which has not been cut, and the whole cell is generally a square large piece structure; or the solar cell 100 in the present embodiment can be a half piece structure obtained by cutting a whole cell once. Figure 1 Figure 3 The solar cell 100 shown in the figure is an example of a half piece structure obtained by cutting a whole cell once. As shown in the figure, Figure 1 Figure 3 In the half piece structure shown in the figure, the size of the solar cell 100 in the first direction D1 is approximately twice the size in the second direction D2. The size of the chamfer of the solar cell 100 can be changed as needed. The solar cell can be a square piece, a rectangular piece, a square-like piece, a rectangular-like piece, etc. of a required size. The solar cell can also be a small piece obtained by equally dividing a whole cell N, where N is an integer from 3 to 12.

[0094] Generally, the solar cell 100 in the conventional tile assembly is a rectangular thin piece, and the sub bus lines 2 are generally extended along the width direction of the rectangle and arranged perpendicularly to the main bus lines. Different from the conventional tile assembly, the solar cell 100 in the present embodiment is also generally rectangular, but the sub bus lines 2 are extended along the length direction of the rectangle, and the sub bus lines 2 and the main bus lines 3 are arranged in parallel.

[0095] ​​​Since the solar cell 100 can be a whole cell that has not been cut or a half-cell structure obtained by cutting the whole cell only once, the size of the large cell is larger. The larger size can improve the area utilization, but it may cause the carrier transmission distance to be too long, resulting in weak collection ability and large loss. The arrangement of the auxiliary grid lines 2, conductive strips 4 and main grid lines 3 on the top and bottom surfaces of the solar cell 100 can solve the problem of the carrier transmission distance being too long that may be caused by the large area of ​​the solar cell 100. Specifically, on the top and bottom surfaces of the solar cell 100, multiple conductive strips 4 and multiple auxiliary grid lines 2 are arranged crosswise, and multiple conductive strips 4 and main grid lines 3 are in contact. Each conductive strip 4 can collect carriers from the auxiliary grid lines 2 and transmit the carriers to the main grid lines 3, avoiding the long-distance transmission of carriers on the auxiliary grid lines 2.

[0096] In addition to the above structures, the shingled conductive structure of the solar cell 100 and the structure of the conductive strips 4 have a variety of optional configurations.

[0097] For example, reference Figure 2 The busbar 3 may include a straight busbar body 31 and a contact portion 32 for contacting the conductive strip 4. The size of the contact portion 32 in the first direction D1 is reduced from the busbar body 31 to a position away from the busbar body 31, that is, the size of the contact portion 32 in the first direction D1 gradually decreases from the second edge 14 to the first edge 13. The area of ​​the portion of the busbar 3 that contacts the conductive strip 4 is relatively large, which facilitates better carrier collection for each solar cell 100 and also facilitates increasing the conductive contact area between adjacent solar cells 100 when stacked, thereby improving the transmission efficiency between the solar cells 100.

[0098] In other embodiments not shown, the busbar lines 3 may be a simple straight-line structure and may be arranged continuously or discontinuously in the first direction D1.

[0099] The conductive strips 4 can include copper foil, copper ribbon, tinned solder ribbon, conductive tape, or conductive wire. The conductive strips 4 can be flat, round, semicircular, trapezoidal, or triangular, or combinations thereof. The number of conductive strips 4 can also be adjusted based on actual conditions. For example, the number of conductive strips 4 can be 2-54, preferably 3-36, more preferably 4-24, even more preferably 5-18, and even more preferably 6-12.

[0100] The conductive strips 4 can be fixed to the solar cell pieces 100 by welding, lapping or using a connecting agent. In the cell string of the shingled assembly, adjacent solar cell pieces are fixed together by a connecting agent. The connecting agent can be a conductive adhesive or a non-conductive connecting agent. The connecting agent can include, for example, at least one of an acrylic resin, an epoxy resin, a polyurethane-based resin. Alternatively, the connecting agent can include a non-conductive connecting agent of silicone or epoxy. Alternatively, the connecting agent includes one of a double-sided tape, a pressure sensitive tape, a pressure sensitive adhesive. The connecting agent can also be a non-conductive connecting agent.

[0101] When applying the connecting agent, the connecting agent can be applied to the conductive strips first, and then the conductive strips are placed on the surface of the solar cell pieces. Alternatively, the connecting agent can be applied to the surface of the solar cell pieces first, and then the conductive strips are placed on the surface of the solar cell pieces. Preferably, the connecting agent is applied according to the following criteria: a conductive connecting agent is applied to the interconnection region where each solar cell piece contacts each other; a non-conductive connecting agent is not applied to the interconnection region.

[0102] Figure 7 A schematic view of the top surface of a solar cell piece 200 in a shingled assembly according to another embodiment of the present application is shown. In this embodiment, the shingled conductive structure is in the form of a conductive connecting portion 203. The conductive connecting portion 203 can also be referred to as a PAD point. A plurality of conductive connecting portions 203 are intermittently arranged in the first direction Dl. Each conductive connecting portion 203 is in conductive contact with a corresponding conductive strip 204. The conductive connection between adjacent solar cell pieces 200 is achieved by the contact between the conductive connecting portions 203. Figure 7

[0103] Irrespective of whether the shingled conductive structure is in the form of a main grid line or a PAD point, the shingled conductive structure can be arranged to be intermittently arranged in the first direction. Furthermore, the shingled conductive structure on the top surface of the solar cell piece and the shingled conductive structure on the bottom surface of the solar cell piece are aligned in the second direction.

[0104] Figure 8 A schematic view of the top surface of a solar cell piece 300 in a shingled assembly according to another embodiment of the present application is shown. In this embodiment, the shingled conductive structure is also in the form of a conductive connecting portion 303. The conductive connecting portion 303 can also be referred to as a PAD point. A plurality of conductive connecting portions 303 are intermittently arranged in the first direction Dl. Each conductive connecting portion 303 is in conductive contact with a corresponding conductive strip 304. The conductive connection between adjacent solar cell pieces 300 is achieved by the contact between the conductive connecting portions 303. Figure 8 ​​

[0105] Also, in Figure 8 In the embodiment shown, an additional conductive connection 305 is also provided at the connection position of the sub-grid line 302 and the conductive strip 304, the additional conductive connection 305 has a dimension in the first direction D1 larger than the width of the conductive strip 304, and the additional conductive connection 305 has a dimension in the second direction D2 larger than the width of the sub-grid line 302. The additional conductive connection 305 increases the contact area between the sub-grid line 302 and the conductive strip 304 to improve the confluence efficiency. The additional conductive connection here can also be referred to as a strong confluence node.

[0106] Figure 9 A top surface schematic diagram of a solar cell 400 in a shingled assembly according to a fourth embodiment of the present application is shown. Referring to Figure 9 , an additional conductive connection 405 as a strong confluence node is also provided at the connection position of the sub-grid line 402 and the conductive strip 404, the additional conductive connection 405 has a dimension in the first direction D1 larger than the width of the conductive strip 404, and the additional conductive connection 405 has a dimension in the second direction D2 larger than the width of the sub-grid line 402. The additional conductive connection 405 increases the contact area between the sub-grid line 402 and the conductive strip 404 to improve the confluence efficiency. Figure 9 In the embodiment shown, the shingled conductive structure is similar to the shingled conductive structure in the embodiment shown in Figure 1 , which will not be described here again.

[0107] Figure 10 A top surface schematic diagram of a solar cell 500 in a shingled assembly according to a fifth embodiment of the present application is shown. Referring to Figure 10 , an additional conductive connection 505 as a strong confluence node is also provided at the connection position of the sub-grid line 502 and the conductive strip 504, the additional conductive connection 505 has a dimension in the first direction D1 larger than the width of the conductive strip 504, and the additional conductive connection 505 has a dimension in the second direction D2 larger than the width of the sub-grid line 502. The additional conductive connection 505 increases the contact area between the sub-grid line 502 and the conductive strip 504 to improve the confluence efficiency.

[0108] In the present embodiment, the shingled conductive structure includes a conductive strip end region 503 at the end of the solar cell 500 in the second direction D2, the projected area of the conductive strip end region 503 on the surface of the solar cell 400 is larger than the projected area of the conductive strip 504 on the surface of the solar cell 400. The conductive strip end region 503 can be circular or elliptical, or other shapes, as long as the aforementioned relative comparison value requirement of the projected area is met. In Figure 10In the illustrated embodiment, the conductive strip end region 503 is formed in a substantially conical structure (which can also be understood as a dune or tower shape).

[0109] With continued reference to Figure 10 , the conductive strip end region 503 is arranged intermittently in the first direction D1. Preferably, the conductive strip end region is also arranged intermittently on the bottom surface of the solar cell 500, and the conductive strip end regions 503 on the top and bottom surfaces of the solar cell 500 are aligned in the second direction D2. In this way, in a shingled assembly, the respective conductive strip end regions 503 of adjacent solar cells 500 are aligned and in contact with each other to achieve an electrically conductive connection.

[0110] In such an embodiment, a non-conductive bonding agent can be used as the bonding agent between the solar cells 500, and the non-conductive bonding agent is preferably not arranged at the conductive connection region, that is, the arrangement position 506 of the non-conductive bonding agent is arranged around the conductive strip end region 503.

[0111] Of course, in such an embodiment, a conductive bonding agent can also be selected, which can be arranged at the conductive connection region. That is, the conductive bonding agent can be arranged directly on the conductive strip end region 503 of the solar cell 500.

[0112] Figure 1 、 Figure 3 、 Figures 7-10 The solar cells illustrated can appear simultaneously in the same shingled assembly, and the top and bottom surfaces of the same solar cell can also have different shingled conductive structures. For example, in a shingled assembly, there can be some solar cells whose top surface is the structure illustrated in Figure 8 , and the bottom surface is the structure illustrated in Figure 3 ; or there can be some solar cells whose top surface is the structure illustrated in Figure 1 , and the shingled conductive structure on the bottom surface is in the form of conductive connection points.

[0113] Alternatively, the solar cell can have only the plurality of busbars, the shingled conductive structure, and the plurality of conductive strips as described in the above embodiments on the top surface, and only the conventional bottom surface structure of the solar cell on the bottom surface; or the solar cell can have only the plurality of busbars, the shingled conductive structure, and the plurality of conductive strips as described in the above embodiments on the bottom surface, and only the conventional top surface structure of the solar cell on the top surface.

[0114] The embodiment also provides a method for manufacturing the shingled assembly. The method comprises the steps of manufacturing a plurality of solar cell pieces and shingling the plurality of solar cell pieces, wherein: the step of manufacturing a plurality of solar cell pieces does not comprise the step of breaking the cell pieces into pieces; or the step of manufacturing a solar cell piece comprises making each cell piece into a piece only once along a straight line.

[0115] The step of setting the solar cell pieces in the method further comprises the steps of setting the base piece, the auxiliary grid line, the shingled conductive structure, and the conductive strip; and the shingling step further comprises the step of applying a connecting agent between adjacent solar cell pieces.

[0116] The above steps can have various preferred embodiments. For example, the above method can comprise the following settings:

[0117] The cell pieces are formed into a cell string in an edge-shingled manner, the shingled manner being that a conductive glue / non-conductive glue is printed at fixed positions at edges of the cell pieces by means of dispensing or screen printing to form a positive-negative electrode interconnection group string between the cell pieces; and the conductive strip is applied on the surface of the cell piece by physical lapping or welding or coating a connecting agent or conductive bonding before or after shingling, so that the conductive strip and the transverse auxiliary grid are effectively electrically connected;

[0118] The coating of the connecting agent can be by printing or spraying on the edge area of the shingled cell piece, the area including an electrode interconnection area where the conductive strip intersects with the shingled conductive structure. In the electrode interconnection area where the conductive strip intersects with the shingled conductive structure, the conductive strip is welded (melting point) or coated with a connecting agent (conductive body or cell piece surface) or conductively bonded at the end of the cell piece, so that the conductive strip and the shingled conductive structure are effectively electrically connected;

[0119] In the electrode interconnection area, a gluing device is used to print or spray a connecting agent on the shingled conductive structure to connect the conductive strip and the shingled conductive structure together to form a front and back surface electrode interconnection and lead out output current;

[0120] When a cell manufactured by a low-temperature process such as HIT is used, a low-melting-point alloy material can be used for welding; and when a cell manufactured by a high-temperature process is used, a high-melting-point alloy material can be used for welding;

[0121] When the connecting agent is coated, the connecting agent is first coated on the conductive body and then the conductive body and the connecting agent are coated together on the cell piece; or the connecting agent is first coated on the surface of the cell piece, and then the conductive body is coated on the connecting agent on the cell piece;

[0122] In the electrode interconnection area, the conductive strip is provided with a conductive contact part at the connection with the shingled conductive structure, which is sufficient to conduct the carriers collected from the transverse auxiliary grid to the end shingled conductive structure; the width of the transverse main grid outside the conductive contact part is variable; when the PAD point is selected as the shingled conductive structure, the PAD point can be circular or other shapes with large cross-sectional area;

[0123] The battery pieces are connected in series in a shingled manner, and the connecting agent between the battery pieces is conductive glue or non-conductive glue, which is applied to the edge area of the end of the battery piece;

[0124] The connecting agent is conductive glue, and is arranged at least in the electrode interconnection area; that is, the non-electrode interconnection area can be provided with or without conductive glue;

[0125] The connecting agent is non-conductive glue, which is arranged in the area outside the electrode interconnection area, and the positive and negative electrodes of the battery piece in the electrode interconnection area are directly in physical contact;

[0126] When low-temperature welding is used, the light injection process of the battery piece and the process of low-temperature solder strip welding are simultaneously performed on the same workbench;

[0127] Before or after the step of dividing the whole battery piece into pieces, the conductive strip is in conductive contact with the auxiliary grid line by physical lapping, welding, or coating of the connecting agent or conductive adhesive;

[0128] When the main grid line is arranged on the surface of the battery piece, the conductive strip and the main grid line are simultaneously formed by electroplating process or formed in steps when the battery end is prepared;

[0129] The plating material of the electroplating is a material containing copper.

[0130] The above method can further include:

[0131] The shingled battery piece is placed in a cutting position, the laser related parameters are set according to the optimal cutting and cutting effect, and the battery piece is cut into a half piece. The automatic piece breaking mechanism completes the piece breaking at the cutting position to realize the separation of the shingled small battery piece, and forms an independent small piece. Or without cutting and piece breaking, a whole heterojunction battery is used;

[0132] The assembly end is combined with the battery piece through a conductive body to form a longitudinal current transmission path inside the battery;

[0133] The conductive glue / non-conductive glue is printed on the fixed position of the battery piece by means of dispensing or screen printing;

[0134] Then the positive and negative electrodes of the battery piece are interconnected to form a string;

[0135] The battery string is arranged by a layout machine, and after automatic deviation correction, an adhesive dispensing device sprays adhesive at the electrode at the end of the battery piece, so that the busbar and the battery piece conductor or main grid are bonded together to form positive and negative electrodes to realize the current output of the battery string;

[0136] The several strings are connected in parallel or parallel-serial connection to complete the assembly layering;

[0137] The layered assembly is subjected to intermediate inspection, lamination, edge cutting, frame mounting, junction box mounting, curing, cleaning, testing and the like to complete the assembly manufacturing.

[0138] The solar cell piece, the tile assembly and the manufacturing method have the following advantages: compared with multiple pieces, the solar cell piece has smaller cutting loss, can greatly increase the efficiency of the tile assembly and reduce the cost; compared with the tile assembly provided with a conventional auxiliary grid line, the tile assembly can effectively reduce the current longitudinal long-distance transmission loss and increase the assembly efficiency; compared with the conventional welding half-piece process, the tile assembly can effectively reduce the stress and the broken piece rate of the assembly and can be compatible with the thinning development of the battery in the later period.

[0139] The above description of various embodiments of the present application is provided to a person of ordinary skill in the relevant art for the purpose of description. The present application is not intended to be exclusive or limited to a single disclosed embodiment. As described above, a person of ordinary skill in the art of the above teachings will understand various alternatives and modifications of the present application. Therefore, although some alternative embodiments are specifically described, a person of ordinary skill in the art will understand or relatively easily develop other embodiments. The present application is intended to include all alternatives, modifications and variations of the present application described herein, and other embodiments falling within the spirit and scope of the present application described above.

Claims

1. A shingled assembly comprising a cell string formed by arranging solar cells in a shingled manner, wherein the top and bottom surfaces of each solar cell are planes defined by a first direction and a second direction, the first direction and the second direction being substantially perpendicular, wherein: Each solar cell is provided on the top and / or bottom surface with: A plurality of secondary grid lines, each of which extends along a first direction; Shingled conductive structure; as well as A plurality of conductive strips are arranged crosswise with the plurality of auxiliary grid lines, and each conductive strip is in contact with the shingled conductive structure, and each conductive strip extends along the second direction. When shingled conductive structures are provided on both the top and bottom surfaces of the solar cell, the shingled conductive structures on the top surface and the shingled conductive structures on the bottom surface are respectively located at two ends of the solar cell in the second direction, so that in the cell string, adjacent solar cells are electrically connected through contact with the shingled conductive structures. The shingled conductive structure includes a conductive strip end region, the conductive strip end region is located at an end of the solar cell in the second direction, and a projected area of ​​the conductive strip end region on the surface of the solar cell is larger than a projected area of ​​the conductive strip on the surface of the solar cell. The conductive strip end regions are intermittently arranged along the first direction, and the conductive strip end regions on the top surface and the bottom surface are aligned and contacted in the second direction to achieve conductive connection.

2. The shingled assembly according to claim 1, wherein: The size of the solar cell in the first direction is greater than or equal to the size in the second direction.

3. The shingled assembly according to claim 1, wherein: The solar cell is a whole cell that has not been split, a half cell obtained by splitting a whole cell, or N-equally divided cells obtained by dividing the whole cell into N equal parts, where N is an integer from 3 to 12.

4. The shingled assembly according to claim 1, wherein: The shingled conductive structure includes a main grid line extending along a first direction.

5. The shingled assembly according to claim 4, wherein: The main grid line includes a straight main grid line body and a contact portion contacting the conductive strip. The size of the contact portion in a first direction is reduced from the main grid line body to a position away from the main grid line body.

6. The shingled assembly according to claim 4, wherein: The main grid lines are arranged continuously or discontinuously in the first direction.

7. The shingled assembly according to claim 1, wherein: The end region of the conductive strip is circular or oval.

8. The shingled assembly according to any one of claims 1 to 7, characterized in that: The cross section of the conductive strip includes at least one of a circle, a semicircle, a trapezoid, a triangle, and an ellipse.

9. The shingled assembly according to any one of claims 1 to 7, characterized in that: Conductive strips are provided on both the top and bottom surfaces of the solar cell. The number of the conductive strips on the top surface of the solar cell is 2-54, and the number of the conductive strips on the bottom surface of the solar cell is 2-54.

10. The shingled assembly according to claim 1, wherein: A strong current conducting node is provided at the contact position between the auxiliary grid line and the conductive strip.

11. The shingled assembly according to claim 1, wherein: The conductive strip is fixed on the surface of the solar cell sheet through a connecting agent, and the connecting agent is at least one of acrylic resin, epoxy resin and polyurethane resin.

12. The shingled assembly according to claim 1, wherein: The conductive strip is fixed on the surface of the solar cell through a connecting agent, and the connecting agent is a silicone or epoxy connecting agent.

13. The shingled assembly according to claim 1, wherein: The conductive strip is fixed on the surface of the solar cell through a connecting agent, and the connecting agent is one of double-sided tape, pressure-sensitive tape, and pressure-sensitive glue.

14. The shingled assembly according to claim 1, wherein: The conductive strips are fixed on the surface of the solar cell through a conductive connecting agent.

15. The shingled assembly according to claim 1, wherein: Adjacent solar cells in a cell string are fixed together by a connecting agent, wherein the connecting agent includes at least one of acrylic resin, epoxy resin, and polyurethane resin.

16. The shingled assembly according to claim 1, wherein: Adjacent solar cells in a cell string are fixed together by a connecting agent, wherein the connecting agent includes a non-conductive connecting agent such as silicone or epoxy.

17. The shingled assembly according to claim 1, wherein: Adjacent solar cells in a battery string are fixed together by a connector, wherein the connector comprises one of a double-sided tape, a pressure-sensitive tape, and a pressure-sensitive glue.

18. The shingled assembly according to claim 1, wherein: Adjacent solar cells in a battery string are fixed together by a connecting agent, which is a conductive connecting agent.

19. The shingled assembly according to claim 18, wherein: The conductive connecting agent is arranged at the conductive connection area between adjacent solar cells.

20. The shingled assembly according to any one of claims 15 to 17, wherein: The connecting agent is not provided at the electrically conductive connection areas between adjacent solar cells.

21. The shingled assembly according to any one of claims 15 to 18, wherein: The connecting agent is provided around the conductive strips.

22. The shingled assembly according to claim 1, wherein: The shingled conductive structure is intermittently arranged in the first direction, and the shingled conductive structure is arranged on the top surface and the bottom surface of the solar cell. The shingled conductive structure located on the top surface of the solar cell and the shingled conductive structure located on the bottom surface of the solar cell are aligned in the second direction.

23. The shingled assembly according to claim 1, wherein: The top and bottom surfaces of the solar cell are both provided with shingled conductive structures. The shingled conductive structure on one of the top and bottom surfaces of each solar cell is the main grid line, and the shingled conductive structure on the other of the top and bottom surfaces is the conductive connecting part.

24. A method for manufacturing a shingled assembly according to any one of claims 1 to 23, characterized in that: The method comprises the steps of manufacturing a plurality of solar cells and laminating the plurality of solar cells, wherein in the step of manufacturing the plurality of solar cells: does not include a step of breaking the cell into pieces; or Each cell is scored and cracked only once along a straight line. Divide the battery cell into N equal parts, where N is an integer from 3 to 12.

25. The method according to claim 24, characterized in that The steps of manufacturing a plurality of solar cells include applying conductive strips on the entire cell, and the steps of applying the conductive strips include: Lap the conductive strips over the entire surface of the cell; or Solder the conductive strips to the entire surface of the cell; or The conductive strips are fixed on the entire surface of the battery cell by a conductive connector or a non-conductive connector.

26. The method according to claim 24, characterized in that The steps of manufacturing a plurality of solar cells include applying conductive strips on the entire cell by welding, and when a heterojunction low-temperature process is adopted, a low-melting-point alloy is selected as the welding material.

27. The method according to claim 24, characterized in that The step of manufacturing a plurality of solar cell sheets includes the step of producing a whole cell sheet, the step of producing a whole cell sheet includes a light injection process, and the light injection process and the low-temperature soldering step are performed simultaneously.

28. The method according to claim 24, characterized in that The method for manufacturing a plurality of solar cell sheets comprises the steps of forming busbars and conductive strips on the entire surface of the cell sheet by adopting an electroplating process synchronously or stepwise.

29. The method according to claim 28, characterized in that The plating material in the electroplating process is a material containing copper.

30. The method according to claim 24, wherein The method further comprises the step of applying a connecting agent between adjacent solar cells, wherein the connecting agent selected is a conductive connecting agent or a non-conductive connecting agent.

31. The method according to claim 24, wherein The method comprises: fixing the conductive strips on the surface of the entire battery cell using a conductive connector or a non-conductive connector, and the steps include: Coating a connecting agent on the conductive strips and then placing the conductive strips on the solar cell; or The connecting agent is applied to the solar cell, and then the conductive strips are placed on the entire cell.

Images