WO2021013275A2

WO2021013275A2 - Shingled assembly, solar cell pieces, and manufacturing method for shingled assembly

Info

Publication number: WO2021013275A2
Application number: PCT/CN2020/118178
Authority: WO
Inventors: 尹丙伟; 孙俊; 陈登运; 丁二亮; 丁士引; 李岩; 石刚
Original assignee: 成都晔凡科技有限公司
Priority date: 2020-01-23
Filing date: 2020-09-27
Publication date: 2021-01-28
Also published as: WO2021013275A3; CN111180533A

Abstract

The present invention relates to a shingled assembly, solar cell pieces, and a manufacturing method for the shingled assembly. A main gate line on a top surface and/or a bottom surface of a solar cell piece in the shingled assembly is a multi-segment main gate line. For any one multi-segment main gate line, a second segment and a third segment extend a long a straight line on the surface same are located on, while a first segment extends skewing away from the extension direction of the second segment and the third segment, thereby leaving space in the extension direction of the second segment and the third segment for applying a binder. The third segment is able to be in direct contact with the main gate line of an adjacent solar cell piece and thereby implement conductive connection between solar cell pieces. In the solution provided in the present invention, main gate lines of solar cell pieces divide out three regions according to the function of each, thus being allowing for direct conductive contact between solar cell pieces without requiring the arrangement of a conductive adhesive, while also being able to satisfy the efficiency requirements for current collection in main gate lines, and the requirement to conserve silver paste in cells.

Description

Shingled module, solar cell sheet and manufacturing method of shingled module

Technical field

The invention relates to the field of energy, in particular to a manufacturing method of a shingled component, a solar cell sheet and a shingled component.

Background technique

As the global consumption of conventional fossil energy such as coal, oil, and natural gas accelerates, the ecological environment continues to deteriorate, especially greenhouse gas emissions leading to increasingly severe global climate changes, and the sustainable development of human society has been seriously threatened. Countries around the world have formulated their own energy development strategies to cope with the finiteness of conventional fossil energy resources and environmental problems caused by development and utilization. Solar energy has become one of the most important renewable energy due to its reliability, safety, versatility, longevity, environmental protection, and resource adequacy, and is expected to become the main pillar of global power supply in the future.

In the new round of energy reform, my country's photovoltaic industry has grown into a strategic emerging industry with international competitive advantages. However, the development of the photovoltaic industry still faces many problems and challenges. Conversion efficiency and reliability are the biggest technical obstacles restricting the development of the photovoltaic industry, and cost control and scale are economic constraints. As the core component of photovoltaic power generation, photovoltaic modules are an inevitable trend to improve their conversion efficiency and develop high-efficiency modules. At present, various high-efficiency components are emerging on the market, such as shingled, half-cell, multi-busbar, and double-sided components. As the application places and application areas of photovoltaic modules become more and more extensive, their reliability requirements are getting higher and higher, especially in some harsh or extreme weather-prone areas, it is necessary to use efficient and highly reliable photovoltaic modules.

In the context of vigorously promoting and using solar green energy, shingled modules use the electrical principle of low current and low loss (the power loss of photovoltaic modules is proportional to the square of the operating current) to greatly reduce the power loss of the modules. Secondly, it generates electricity by making full use of the inter-chip spacing area of the battery assembly, and the energy density per unit area is high. In addition, conductive adhesives with elastomer properties are currently used instead of conventional photovoltaic metal ribbons for modules. Because the photovoltaic metal ribbons exhibit higher series resistance in the entire cell, the current loop of the conductive adhesive has a much shorter stroke than welding. The method of ribbons finally makes the shingled modules become highly efficient modules. At the same time, the reliability of outdoor applications is better than the performance of conventional photovoltaic modules, because the shingled modules avoid the stress damage to the battery and battery interconnection position and other confluence areas by the metal soldering strip . Especially in the dynamic environment of high and low temperature alternating (wind, snow and other natural loads) environment, the failure probability of conventional components using metal ribbon interconnection package is much higher than that of crystalline silicon battery chip package after using elastomer conductive adhesive to interconnect and cut. Shingled components.

The current mainstream technology of shingle assembly uses conductive adhesive to interconnect the cut cells. Such a cell chip is shown in Figure 1. Its busbar lines are generally arranged continuously and singly along the edge, and the cell chips are connected by conductive glue. Realize conductive connection. The conductive adhesive is mainly composed of a conductive phase and an adhesive phase. The conductive phase is mainly composed of precious metals, such as pure silver particles or silver-coated copper, silver-coated nickel, silver-coated glass and other particles, and is used to conduct electricity between solar cells. Its particle shape and distribution meet the optimal electrical conductivity As a benchmark, currently more flake or ball-like combination silver powder with D50<10um level is mostly used. The adhesive phase is mainly composed of high-molecular resin polymers with weather resistance, and acrylic resin, silicone resin, epoxy resin, polyurethane, etc. are usually selected according to the adhesive strength and weather resistance stability. In order to achieve low contact resistance, low volume resistivity, high bonding and long-term excellent weather resistance for conductive adhesive bonding, generally conductive adhesive manufacturers will complete the design of conductive phase and bonding phase formula to ensure The performance stability of shingled components in the initial environmental corrosion test and long-term outdoor practical application.

As for the battery components connected by conductive glue, after being packaged, they are subject to environmental erosion during actual outdoor use, such as high and low temperature alternating thermal expansion and contraction resulting in relative displacement between the conductive glue. The most serious cause is the virtual connection or even open circuit of the current. The main reason is generally the weak connection ability between the materials after the combination. The weak connection ability is mainly manifested in that the conductive adhesive operation in the process requires a process operation window. In the actual production process, this window is relatively narrow and is very susceptible to environmental factors, such as the temperature and humidity of the workplace, and the time spent in the air after applying the glue. Length and so on will make the conductive glue lose its activity. At the same time, it is prone to uneven sizing due to changes in the characteristics of the glue under the glue dispensing, spraying or printing process, which will have greater hidden dangers to product reliability. Secondly, the conductive adhesive is mainly composed of polymer resin and a large amount of precious metal powder, which is expensive and destroys the ecological environment to a certain extent (the production and processing of precious metals pollute the environment). Furthermore, the conductive adhesive is a paste, which has a certain degree of fluidity during the sizing or lamination process, and it is very easy to overflow the glue and cause the short circuit of the positive and negative electrodes of the shingled interconnected battery string.

That is to say, most shingled components made by conductive adhesive bonding have the characteristics of weak interconnection strength, high environmental requirements for the manufacturing process, easy short-circuiting when the process is used, high cost of use, and low production efficiency. .

In order to solve these problems, it is necessary to use a non-conductive adhesive to replace the conductive glue. Then, the solar cells need to have conductive measures other than the conductive glue to ensure the conductive connection between the solar cells. How to ensure the conductive connection between the solar cells without affecting the current collection of the busbar line and ensuring the effective application of the adhesive without destroying the structure of the busbar line is an urgent problem to be solved.

Therefore, it is necessary to provide a shingled module, a solar cell sheet, and a manufacturing method of the shingled module to at least partially solve the above-mentioned problems.

Summary of the invention

The purpose of the present invention is to provide a shingled module, a solar cell sheet and a manufacturing method of the shingled module. In the present invention, the main grid lines of the solar cell sheet are divided into three regions according to their respective functions, which can realize the solar cell The direct conductive contact between the chips can also meet the efficiency requirements of the main grid line to collect current and the integrity requirements of the main grid line.

Moreover, since the solar cells can be electrically conductive through the direct contact of the main grid lines, there is no need to provide conductive glue, which can avoid a series of problems such as short circuit and glue opening that may be caused by the conductive glue.

According to one aspect of the present invention, there is provided a shingled assembly, the shingled assembly comprising a plurality of solar cell sheets, and the plurality of solar cell sheets are arranged in a shingled manner along a first direction and opposed by an adhesive. To be fixed to each other, wherein the solar cell sheets include a base sheet, each of the base sheet is provided with a busbar line on the top surface and the bottom surface, at least one of the top surface and the bottom surface The busbar line on the upper part is a multi-segment busbar line, and the multi-segment busbar line includes a first section, a third section, and a connection between the first section and the third section. The second part, in which:

The second section and the third section extend along a straight line on the surface on which they are located, and the first section extends in a direction deviating from the extension of the second section and the third section Thereby leaving a space in the extension direction of the second section and the third section for applying the adhesive; and

The third section can directly contact the main grid lines of the adjacent solar cells so as to realize the conductive connection between the solar cells.

In one embodiment, the second section and the third section extend along a longitudinal edge of the base sheet, and the first section extends from the longitudinal edge on the surface on which it is located. It is recessed toward the other longitudinal edge of the base sheet.

In one embodiment, the second section and the third section extend close to one longitudinal edge of the base sheet, and the first section extends from the second section on the surface on which it is located. And the extending direction of the third section is further concave toward the longitudinal edge.

In one embodiment, the first section includes a central section and a connecting section, the central section extends parallel to the second direction, and the connecting section connects the central section and the second section.

In one embodiment, the widths of the first section, the second section and the third section are equal, or the widths of the first section and the second section are smaller than the width of the The width of the third section.

In one embodiment, the width of the first section is smaller than the width of the third section, and the width of the second section is from the third section to the first section. Taper in the direction.

In one embodiment, the inner edge of the second section is flush with the inner edge of the third section, and the outer edge of the second section approaches the inner edge section to form a tapered width; or

The inner and outer edges of the second section are gradually approaching each other to form a tapered width.

In one embodiment, the height of the third section is greater than the height of the second section, so that any pair of adjacent solar cell sheets facing each other on the first busbar line There is a gap between the two sections in a direction perpendicular to the base sheet.

In one embodiment, the thickness of the second section tapers in a direction from the third section to the first section.

In one embodiment, the third section is a solid strip structure.

In one embodiment, a hollow part is provided on the third section.

In one embodiment, the hollow part is a circular hole structure or a triangular hole structure formed on the third section.

In one embodiment, the bus bars on the top surface and the bottom surface of the solar cell are both multi-segment bus bars, and the length of the third section on the top surface of the solar cell is It is not equal to the length of the third section located on the bottom surface of the solar cell sheet.

In one embodiment, the bus bars on the top surface and the bottom surface of the solar cell sheet are both multi-segment bus bars, and the surface of the third section facing away from the base sheet is formed in a zigzag shape In a structure, the third sections facing each other of two adjacent solar cell sheets are in contact with each other in the form of rack meshing.

In one embodiment, the joint height of the third section of each pair of adjacent solar cell sheets in contact is greater than or equal to the height of the adhesive.

In one embodiment, the busbar on one of the top surface and the bottom surface of each solar cell sheet is a multi-segment busbar, and the busbar on the other is intermittently arranged The multi-segment gate line structure, wherein, in the first direction, the multi-segment gate line structure is at least aligned with the third section of the multi-segment main gate line, and the interval between the multi-segment gate line structure The portion is at least aligned with the first section of the multi-section grid line.

In one embodiment, the adhesive is not conductive.

According to another aspect of the present invention, there is provided a solar cell sheet. A plurality of the solar cell sheets can be arranged in a shingled manner in a first direction and fixed with respect to each other by an adhesive. The battery sheet includes a base sheet, a top surface and a bottom surface of the base sheet are each provided with a busbar line, and the busbar line on at least one of the top surface and the bottom surface is a multi-segment busbar line , The multi-segment main grid line includes a first segment, a third segment, and a second segment connected between the first segment and the third segment, wherein:

The second section and the third section extend along a straight line on the surface on which they are located, and the first section extends away from the extending direction of the second section and the third section Thereby leaving a space in the extension direction of the second section and the third section for applying the adhesive; and

In one embodiment, the second section and the third section extend close to one longitudinal edge of the base sheet, and the first section extends from the second section on the surface on which it is located. And the extending direction of the section is further recessed toward the longitudinal edge.

In one embodiment, the width of the first section is smaller than the width of the third section, and the width of the second section is from the first section to the third section. Taper in the direction.

In one embodiment, the third section is a solid strip structure.

In one embodiment, a hollow part is provided on the third section.

In one embodiment, the surface of the third section facing away from the base sheet is formed in a zigzag structure, so that the bus bars of the two adjacent solar cell sheets facing each other The third sections are in contact with each other in the form of rack engagement.

In one embodiment, the thickness of the main grid line is configured such that the joint height of the third section of each pair of adjacent solar cell sheets is greater than or equal to that of the adhesive. height.

In one embodiment, the busbar on one of the top surface and the bottom surface is a multi-segment busbar, and the busbar on the other is a multi-segment busbar structure intermittently arranged, wherein, In the first direction, the multi-segment gate line structure is at least aligned with the third section of the multi-segment main gate line, and the interval between the multi-segment gate line structure is at least aligned with the multi-segment The first sections of the grid lines are aligned.

According to another aspect of the present invention, there is provided a manufacturing method of the shingled assembly according to any one of the above solutions, the manufacturing method comprising the following steps:

Manufacturing a plurality of solar cell sheets, the plurality of solar cell sheets can be sequentially connected in a shingled manner in a first direction, each of the solar cell sheets includes a base sheet, the top surface and the bottom surface of the base sheet Each busbar line is provided, and the busbar line on at least one of the top surface and the bottom surface is a multi-section busbar line, and the multi-section busbar line includes a first section, a third Section and a second section connected between the first section and the third section, wherein: the second section and the third section are along a straight line on the surface where they are located Extend, and the first section extends away from the direction in which the second section and the third section extend so as to leave a space in the direction in which the second section and the third section extend. Used to apply the adhesive; the third section can directly contact the main grid lines of the adjacent solar cells so as to realize the conductive connection between the solar cells;

Applying an adhesive to the space left by the first section of each of the solar cells;

The plurality of solar cells are arranged in shingles along the first direction, are fixed to each other and make the third section of the main grid line of any two adjacent solar cells face each other direct contact.

In an embodiment, the step of manufacturing the plurality of solar cells includes:

Pretreatment of the entire solar cell;

The whole solar cell sheet after the pretreatment is cut into small pieces to form the plurality of solar cell sheets.

In one embodiment, the step of preprocessing the entire solar cell sheet includes:

Making texturing on the surface of the total substrate sheet of the whole solar cell sheet;

An inner passivation layer is grown and deposited on both the front and back of the total substrate sheet;

Growing and depositing a middle passivation layer on the inner passivation layer;

An outer passivation layer is grown and deposited on the middle passivation layer.

In one embodiment, the inner passivation layer is deposited by thermal oxidation or laughing gas oxidation or ozonation or nitric acid solution chemical method, and the inner passivation layer is set as a silicon dioxide film layer; and/or

The middle passivation layer is deposited by a PECVD or ALD layer or a solid target material by a PVD layer method, and the middle passivation layer is set as an aluminum oxide film layer or a film layer containing aluminum oxide; and/or

The outer passivation layer is deposited by PVD, CVD or ALD method.

In one embodiment, the method does not include the step of applying conductive glue.

According to the present invention, the main grid lines of the solar cells are divided into three regions according to their respective functions, which can realize the direct conductive contact between the solar cells without providing conductive glue, and at the same time can meet the efficiency requirements of the main grid lines to collect current And the integrity requirements of the busbar.

Description of the drawings

In order to better understand the above and other objects, features, advantages and functions of the present invention, reference may be made to the preferred embodiments shown in the drawings. The same reference numerals in the drawings refer to the same parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate the preferred embodiments of the present invention, and do not have any limitation on the scope of the present invention, and the various components in the drawings are not drawn to scale.

Figure 1 is a schematic front view of a conventional solar cell;

Figure 2 is a front view of the shingle assembly of a preferred embodiment of the present invention;

3A and 3B are respectively a view of the back and front of a solar cell sheet according to a preferred embodiment of the present invention;

Figure 4 is a partial enlarged view of part B in Figure 3;

FIG. 5 is an alternative solution of FIG. 4, which also shows a partially enlarged view of part B that may be realized in FIG. 3;

FIG. 6 is another alternative solution of FIG. 4, which also shows a partially enlarged view of the possible part B in FIG. 3;

FIG. 7 is another alternative solution of FIG. 4, which also shows a partial enlarged view of the possible part B in FIG. 3;

Fig. 8 is a front view of the solar cell sheet in Fig. 3 after an adhesive is applied;

Figure 9 is a partial enlarged view of part C in Figure 3;

FIG. 10 is an alternative solution of FIG. 9, which also shows a partial enlarged view of part C that may be realized in FIG. 3;

FIG. 11 is another alternative solution of FIG. 9, which also shows a partially enlarged view of part C that may be realized in FIG. 3;

Fig. 12 is a schematic cross-sectional view of a preferred embodiment taken along line A-A in Fig. 2.

Detailed ways

Now referring to the drawings, specific embodiments of the present invention will be described in detail. What is described here is only the preferred embodiments of the present invention, and those skilled in the art can think of other ways to implement the present invention on the basis of the preferred embodiments, and the other ways also fall within the scope of the present invention.

The present invention provides a shingled module, a solar cell sheet and a method of manufacturing the shingled module. Figures 2 to 12 show several preferred embodiments of the present invention.

Fig. 2 shows a shingle assembly 2 of a preferred embodiment of the present invention. First of all, it should be noted that the “first direction” mentioned later can be understood as the arrangement direction of each solar cell in the shingled assembly 2, which is roughly the same as the width direction of each rectangular solar cell. One direction is shown by D1 in Figure 2; the "second direction" can be understood as the direction in which the second and third sections of the multi-segment busbar line (which will be described in detail later) extend. The two directions are shown by D2 in FIG. 3.

The shingled assembly 2 includes a plurality of solar cell sheets 1, and the structures of the bottom surface 25 and the top surface 24 of the solar cell sheet 1 are roughly shown in FIGS. 3A and 3B, respectively. The solar cell sheet 1 includes a base sheet, and the base sheet is preferably made of silicon. A plurality of grid lines are printed on the surface of the substrate sheet. The grid lines include sub-grid lines for current collection and main grid lines for confluence. Among them, the main grid lines on the top surface of the substrate sheet are also called positive The electrode, the bus bar located on the bottom surface of the base sheet is also called the back electrode, and the positive electrode and the back electrode are preferably made of silver.

3B, in this embodiment, the positive electrode 13 is a multi-segment bus line, the multi-segment bus line includes a first section 131, a third section 133 and connected to the first section 131 and third The second section 132 between the sections 133. The second section 132 and the third section 133 extend along a straight line on the top surface 24 of the base sheet. The extension direction of the second section 132 and the third section 133 is marked as the second direction D2, the second direction D2 is substantially perpendicular to the first direction D1, and the first section 131 extends away from the extension direction of the second section 132 and the third section 133, thereby leaving in the extension direction of the second section 132 and the third section 133. Leave space for applying adhesive. The third section 133 can directly contact the main grid lines of the solar cells adjacent to it to realize the conductive connection between the solar cells. The second section 132 is mainly used for collecting current from the secondary grid line.

In the embodiment shown in FIG. 3A, the back electrode 12 is a multi-segment gate line structure intermittently arranged instead of a multi-segment main gate line. The specific structure of the back electrode will be described in detail later.

An embodiment of the positive electrode 13 formed as a multi-segment bus line is shown in FIG. 4. The second section 132 and the third section 133 extend along one longitudinal edge of the base sheet, and the first section 131 is recessed inwardly on the top surface from the longitudinal edge toward the other longitudinal edge of the base sheet. For the convenience of description, the longitudinal edge along which the second section 132 and the third section 133 extend is called the left longitudinal edge, and the other longitudinal edge is called the right longitudinal edge, then the left longitudinal edge points to the right The direction of the longitudinal edge is shown by D1+ in FIG. 4. It can be understood that the first section 131 is concave inward along the direction D1+ from the second section 132 and the third section 133. In this way, the first section 131 extends relative to the extending direction of the second section 132 and the third section 133, thereby leaving space for the adhesive on the second section 132 and the third section 133. The state where the adhesive 4 is applied to the solar cell sheet at the reserved space is shown in FIG. 8.

Further, with continued reference to FIG. 4, the first section 131 includes a central section 131a and two connecting sections 131b, wherein the central section 131a extends parallel to the second direction D2, and the connecting section 131b is connected between the central section 131a and the second section 132 between. In this embodiment, the central section 131a and the connecting section 131b are both straight sections, but in other embodiments not shown, the first section may be an arc section.

On the other hand, continuing to refer to FIG. 4, the widths of the second section 132 and the first section 131 are smaller than the third section 133. This arrangement is because a narrow grid line can effectively complete the confluence, and the grid line part used to lead the current to another solar cell needs to have a wider thickness, so the embodiment shown in Figure 4 can both To ensure the effective current collection of the second section 132, it can also ensure that the third section 133 can be in effective conductive contact with another main grid line. In other embodiments not shown, the first section, the second section, and the third section may have equal widths.

FIG. 5 shows another embodiment of the positive electrode 13 formed as a multi-segment bus line. In this embodiment, the arrangement of the first section 131 and the third section 133 is the same as that in FIG. 4, but the width of the second section 132a gradually increases in the direction from the third section 133 to the first section 131. Specifically, the end of the second section 132 connected to the third section 133 has the same width as the third section 133, and the end of the second section 132a connected to the first section 131 has the same width as the first section 131. The sections 131 are of equal width. In addition, the inner edge of the second section 132 is flush with the inner edge of the third section 133, except that the outer edge of the second section 132 approaches the inner edge section to form a tapered width.

FIG. 6 shows another embodiment of the positive electrode 13 formed as a multi-segment bus line. In this embodiment, the arrangement of the first section 131 and the third section 133 is the same as that in FIG. 5, but the width of the second section 132b gradually increases in the direction from the third section 133 to the first section 131. Shrink. In this embodiment, the end of the second section 132b connected to the third section 133 has the same width as the third section 133, but the width of the end connected to the first section 131 is still greater than that of the first section The width. In addition, the inner edge and the outer edge of the second section 132b both approach each other to form a tapered width.

The above two arrangements ensure the fluency of the overall convergence of the main grid line, and can enhance the strength of the second section to avoid breakage.

Fig. 7 shows yet another embodiment of a multi-segment busbar. In this embodiment, the arrangement of the second section 132c and the third section 133 is substantially similar to the above-mentioned several embodiments, the second direction D2 is a direction close to a longitudinal edge of the base sheet, and the first section 134 is The top surface of the base sheet is further recessed from the extending direction of the second section 132c and the third section 133 toward the longitudinal edge, and the recessed direction of the first section 134 can be shown by D1- in FIG. 7. Such an arrangement can make the first section 134 hidden in the battery overlap area after the lamination, thereby making the appearance of the shingle assembly more beautiful.

In addition to the first section and the second section as described above, the third section of the multi-section busbar can also have a variety of alternative implementations.

In the embodiment shown in FIG. 9, the third section 133a is provided with a hollow part, and the hollow part is formed in a triangular hole structure, and every three triangular holes are arranged in a group along the second direction. In the embodiment shown in FIG. 10, the third section 133b is also provided with a hollow part, the hollow part is formed as a circular hole structure, and every five circular holes are arranged in a group along the second direction. In the embodiment shown in FIG. 11, the third section 133 is a solid structure, and the third section 133 smoothly transitions to the second section 132.

As described above and shown in FIG. 3, the back electrode 12 of the solar cell sheet can be a multi-segment grid line structure intermittently arranged. In the first direction, each segment of the grid line 121 of the multi-segment grid line structure is at least connected to the multi-segment grid line structure. The third section 133 of the main grid line is aligned so that in the shingled assembly, the third section 133 of one of the two adjacent solar cells can be in contact with the grid lines 121 of the other. In addition, in the first direction, the spacing portion 122 of the multi-segment grid line structure is at least aligned with the first section 131 of the multi-segment grid line, so that for adjacent solar cells, the first section 131 of one of the The space left in the second direction can accommodate the adhesive together with the other spacer 121.

However, in other embodiments, the positive electrode and the back electrode of the solar cell can be configured as a multi-segment busbar. Figure 12 shows the connection structure of two adjacent solar cells, in which the one on the top side The back electrode 12a of the solar cell 1 and the positive electrode 13 of the solar cell 1 on the bottom side are both multi-segment busbars. In the scheme shown in FIG. 12, S1 represents the area corresponding to the first section, S2 represents the area corresponding to the second section, and S3 represents the area corresponding to the third section. It can be seen from the figure that the third section of the positive electrode 13 and the back electrode 13a are in contact with each other, and the contact surface is marked as the conductive contact surface 23; the first section of the positive electrode 13 and the back electrode 12a is reserved for accommodation The space of the adhesive 4 in which the adhesive 4 is applied and the height of the adhesive 4 is less than or equal to the joining height of the two third sections.

The connecting part between the first section and the third section is the second section. It can be seen from FIG. 12 that the second sections of the two solar cells 1 are not tightly joined but are perpendicular to the substrate. There is a gap 26 in the direction of the sheet, that is, the height of the second section is smaller than the height of the third section. Preferably, as shown in the figure, the thickness of the second section is reduced in the direction from the third section to the first section.

Preferably, the adhesive can be made of non-conductive materials. For example, the adhesive can be acrylic resin, silicone resin, epoxy resin, polyurethane, etc. In order to form a certain adhesive thickness, some additives need to be added to it. The agent is, for example, a curing agent, a crosslinking agent, a coupling agent, or rubber balls.

In other embodiments not shown in the drawings, the solar cell sheet may also have more preferred settings. For example, in the case where the top surface and the bottom surface of the solar cell sheet are provided with multi-segment grid lines, the length of the third section on the top surface may be greater than or less than the length of the third section on the bottom surface. For another example, the busbar lines on the top surface and the bottom surface of the solar cell sheet are both multi-segment busbar lines, the surface of the third section facing away from the base sheet may be formed in a zigzag structure, and two adjacent ones The third sections of the solar cells facing each other can be in contact with each other in the form of rack engagement.

The present invention also provides a manufacturing method for manufacturing the above-mentioned shingled assembly, which includes the following steps:

Manufacturing a plurality of solar cell sheets, the plurality of solar cell sheets can be sequentially connected in a shingled manner in a first direction, each of the solar cell sheets includes a base sheet, the top surface and the bottom surface of the base sheet Each busbar line is provided, and the busbar line on at least one of the top surface and the bottom surface is a multi-section busbar line, and the multi-section busbar line includes a first section, a third Section and a second section connected between the first section and the third section, wherein: the second section and the third section are along a straight line on the surface where they are located Extend, and the first section extends away from the extension direction of the second section and the third section so as to leave a space in the extension direction of the second section and the third section for applying the adhesive ; The third section can directly contact the main grid lines of the adjacent solar cells to realize the conductive connection between the solar cells;

Further, the step of manufacturing the plurality of solar cell sheets includes:

Pretreatment of the entire solar cell;

Further, the step of preprocessing the entire solar cell sheet includes:

Further, the inner passivation layer is deposited by thermal oxidation, laughing gas oxidation, ozonation, or nitric acid solution chemical method, and the inner passivation layer is set as a silicon dioxide film layer; and/or

The outer passivation layer is deposited by PVD, CVD or ALD method.

Preferably, the adhesive is a non-conductive adhesive, and the method does not include an additional step of applying conductive adhesive.

The various processes mentioned above can be more specific and optimized. For example, for the texturing step, monocrystalline silicon wafers are used for surface texturing to obtain a good textural structure, so as to increase the specific surface area and accept more photons (energy), while reducing the reflection of incident light. The subsequent steps may include cleaning The step of residual liquid during texturing to reduce the influence of acidic and alkaline substances on battery formation. After texturing, it can also include the step of making PN junction, which includes: Phosphorus oxychloride reacts with the silicon wafer to obtain phosphorus atoms; after a certain period of time, the phosphorus atoms enter the surface layer of the silicon wafer and pass between the silicon atoms. The voids infiltrate and diffuse into the silicon wafer, forming an interface between N-type semiconductor and P-type semiconductor. Complete the diffusion process and realize the conversion of light energy to electric energy. Since the diffusion junction forms a short-circuit channel at the edge of the silicon wafer, the photogenerated electrons collected on the front side of the PN junction will flow to the back side of the PN junction along the area where phosphorous is diffused at the edge, causing a short circuit. After plasma etching, the edge PN Junction etching removal can avoid short circuits caused by edges, and in addition, SE process steps can be added. In addition, since the diffusion bonding process will form a layer of phosphorous silicate on the surface of the silicon wafer, the dephosphorized silicate glass process reduces the impact on the efficiency of the shingled cell.

Further, after forming the passivation layer, the silicon wafer can be laser slotted; after printing the electrodes, sintering is performed, and the light decay furnace or electric injection furnace is used to reduce the light-induced attenuation of the battery, and finally the battery test is classified.

The step of splitting the silicon wafer into a plurality of solar cell pieces is preferably completed using a laser cutting machine. Add online laser cutting and scribing process to the sintered whole silicon wafer. The sintered whole silicon wafer enters the scribing inspection position for appearance inspection and visual positioning of the OK wafer (the appearance inspection will be automatically shunted to the NG position), According to the online production beat, the multi-track dicing machine or the preset buffer stack area can be set freely to realize the online continuous feeding operation. Set the laser related parameters according to the optimal effect of cutting scribing to achieve faster cutting speed, narrower cutting heat affected zone and cutting line width, better uniformity and predetermined cutting depth. After the automatic cutting is completed, the automatic splitting mechanism of the online laser scribing machine completes the splits at the cutting position to realize the natural separation of each solar cell. It should be noted that the laser cutting surface is far away from the PN junction side to avoid leakage current due to damage to the PN junction. It is necessary to confirm the front and back of the cell before dicing and loading. If the direction is opposite, a separate 180° reversing device needs to be added.

Finally, after connecting each solar cell in series to form a shingled module, it will go through automatic typesetting and confluence, film and backplane laying, intermediate inspection, lamination, trimming, framing, intermediate junction box, curing, cleaning, testing, etc. Complete shingled assembly packaging.

The solar cell, shingled component and manufacturing method of the present invention enable the interconnection of the solar cells to form a shingled component, and the solar cells realize conductive interconnection through direct contact between the positive electrode and the back electrode. Conductive conductive adhesive. In this way, environmental corrosion, high and low temperature alternation, thermal expansion and contraction and other factors that easily damage the conductive adhesive will not affect the shingled component of the present invention, and therefore, current virtual connection and disconnection are unlikely to occur. In addition, since there is no need to provide conductive glue, problems such as open circuit of the positive and negative electrodes of the shingle assembly caused by overflow of glue will not occur. In addition, since the conductivity of the adhesive is not required, the production cost of the shingled assembly is also reduced.

The foregoing description of the various embodiments of the present invention is provided for the purpose of description to a person of ordinary skill in the related art. It is not intended that the invention be exclusive or limited to a single disclosed embodiment. As described above, a person of ordinary skill in the field taught above will understand many alternatives and modifications of the present invention. Therefore, although some alternative embodiments are specifically described, those of ordinary skill in the art will understand or develop other embodiments with relative ease. The present invention is intended to include all alternatives, modifications and variations of the present invention described herein, as well as other embodiments falling within the spirit and scope of the present invention described above.

Reference signs:

Solar cell 1

Shingled component 2

Top surface of solar cell 24

The bottom surface of the solar cell 25

Substrate 11

Positive electrode 13

Back electrode

12, 12a

Binder 4

Conductive contact surface 23

The

first section

131, 134

The

second section

132, 132a, 132b, 132c

The

third section

133, 133a, 133b

Space between the second section of two solar cells 26

Central section 131a

Connection section 131b

First direction D1

Second direction D2

Claims

A shingled assembly, the shingled assembly comprising a plurality of solar cells, the plurality of solar cells are arranged in a shingled manner along a first direction and fixed relative to each other by an adhesive, wherein each The solar cell sheet includes a base sheet, a top surface and a bottom surface of the base sheet are each provided with a busbar line, characterized in that the busbar line on at least one of the top surface and the bottom surface Is a multi-section busbar line, the multi-section busbar line includes a first section, a third section, and a second section connected between the first section and the third section, among them:

The second section and the third section extend along a straight line on the surface on which they are located, and the first section extends away from the direction in which the second section and the third section extend so as to Leave a space in the extension direction of the second section and the third section for applying the adhesive; and

The third section can directly contact the main grid lines of the adjacent solar cells so as to realize the conductive connection between the solar cells.
The shingle assembly according to claim 1, wherein the second section and the third section extend along one longitudinal edge of the base sheet, and the first section is on the surface where it is located. The upper part is recessed from the longitudinal edge toward the other longitudinal edge of the base sheet.
The shingle assembly according to claim 1, wherein the second section and the third section extend close to a longitudinal edge of the base sheet, and the first section is on the surface where it is located. The upper part is further recessed from the extending direction of the second section and the third section toward the longitudinal edge.
The shingle assembly according to claim 2 or 3, wherein the first section includes a central section and a connecting section, the central section extends parallel to the second direction, and the connecting section connects the central section And the second section, the second direction is perpendicular to the first direction.
The shingle assembly according to claim 1, wherein the widths of the first section, the second section and the third section are equal, or the first section and the first section The width of the second section is smaller than the width of the third section.
The shingle assembly according to claim 1, wherein the width of the first section is smaller than the width of the third section, and the width of the second section is greater than the width of the third section. Taper in the direction of the first section.
The shingle assembly according to claim 6, wherein:

The inner edge of the second section is flush with the inner edge of the third section, and the outer edge of the second section approaches the inner edge section to form a tapered width; or

Both the inner edge and the outer edge of the second section gradually approach each other to form a tapered width.
The shingled assembly according to claim 1, wherein the height of the third section is greater than the height of the second section, so that all pairs of adjacent solar cells face each other. There is an interval between the second sections of the busbar line in a direction perpendicular to the base sheet.
8. The shingle assembly according to claim 8, wherein the thickness of the second section is tapered in a direction from the third section to the first section.
The shingle assembly according to claim 1, wherein the third section is a solid strip structure.
The shingle assembly according to claim 1, wherein a hollow part is provided on the third section.
The shingle assembly according to claim 11, wherein the hollow part is a circular hole structure or a triangular hole structure formed on the third section.
The shingled assembly according to claim 1, wherein the main grid lines on the top surface and the bottom surface of the solar cell are both multi-segment main grid lines and are located on the top surface of the solar cell. The length of the third section above is not equal to the length of the third section on the bottom surface of the solar cell sheet.
The shingled assembly according to claim 1, wherein the main grid lines on the top surface and the bottom surface of the solar cell are both multi-segment main grid lines, and the third section is away from the The surface of the base sheet is formed in a zigzag structure, and the third sections facing each other of the two adjacent solar cell sheets are in contact with each other in the form of rack meshing.
The shingle assembly according to claim 1, wherein the joint height of the third section of each pair of adjacent solar cells is greater than or equal to the height of the adhesive.
The shingled assembly according to claim 1, wherein the busbar line on one of the top surface and the bottom surface of each solar cell sheet is a multi-segment busbar line, and the other The upper bus line is a multi-section gate line structure intermittently arranged, wherein, in the first direction, the multi-section gate line structure is at least aligned with the third section of the multi-section bus line, so The spacing part between the multi-segment gate line structure is at least aligned with the first section of the multi-segment gate line.
The shingle assembly of claim 1, wherein the adhesive is not electrically conductive.
A solar cell sheet, wherein a plurality of the solar cell sheets can be arranged in a shingled manner in a first direction and fixed with respect to each other by an adhesive, wherein each solar cell sheet includes a base sheet, The top surface and the bottom surface of the base sheet are each provided with a busbar line, and the busbar line on at least one of the top surface and the bottom surface is a multi-segment busbar line. The main grid line includes a first section, a third section and a second section connected between the first section and the third section, wherein:

The second section and the third section extend along a straight line on the surface on which they are located, and the first section extends away from the extending direction of the second section and the third section Thereby leaving a space in the extension direction of the second section and the third section for applying the adhesive; and

The third section can directly contact the main grid lines of the adjacent solar cells so as to realize the conductive connection between the solar cells.
The solar cell sheet according to claim 18, wherein the second section and the third section extend along a longitudinal edge of the base sheet, and the first section is on the surface where it is located. The upper part is recessed from the longitudinal edge toward the other longitudinal edge of the base sheet.
The solar cell sheet according to claim 18, wherein the second section and the third section extend close to a longitudinal edge of the base sheet, and the first section is on the surface where it is located. The upper part is further recessed from the extending direction of the second section and the third section toward the longitudinal edge.
The solar cell according to claim 18 or 19, wherein the first section includes a central section and a connecting section, the central section extends parallel to the second direction, and the connecting section connects the central section And the second section, the second direction is perpendicular to the first direction.
The solar cell sheet according to claim 18, wherein the widths of the first section, the second section and the third section are equal, or the first section and the first section The width of the second section is smaller than the width of the third section.
The solar cell sheet of claim 18, wherein the width of the first section is smaller than the width of the third section, and the width of the second section is greater than the width of the first section. Taper in the direction of the third section.
The solar cell sheet according to claim 23, wherein:

The inner edge of the second section is flush with the inner edge of the third section, and the outer edge of the second section approaches the inner edge section to form a tapered width; or

The inner and outer edges of the second section are gradually approaching each other to form a tapered width.
The solar cell according to claim 18, wherein the height of the third section is greater than the height of the second section, so that all pairs of adjacent solar cells face each other. There is an interval between the second sections of the busbar line in a direction perpendicular to the base sheet.
The solar cell sheet according to claim 25, wherein the thickness of the second section is tapered in a direction from the third section to the first section.
The solar cell sheet of claim 18, wherein the third section is a solid strip structure.
The solar cell sheet according to claim 18, wherein a hollow portion is provided on the third section.
The solar cell sheet according to claim 28, wherein the hollow portion is a circular hole structure or a triangular hole structure formed on the third section.
The solar cell according to claim 18, wherein the busbars on the top surface and the bottom surface of the solar cell are both multi-segment busbars, and are located on the top surface of the solar cell The length of the third section above is not equal to the length of the third section on the bottom surface of the solar cell sheet.
The solar cell sheet according to claim 18, wherein the surface of the third section facing away from the base sheet is formed in a zigzag structure, so that two adjacent solar cell sheets face each other The third sections of the pair of the bus bars are in contact with each other in the form of rack engagement.
The solar cell sheet according to claim 18, wherein the thickness of the main grid line is configured such that the joint height of the third section of each pair of adjacent solar cell sheets is greater than Or equal to the height of the adhesive.
The solar cell according to claim 18, wherein the busbar on one of the top surface and the bottom surface is a multi-segment busbar, and the busbar on the other is intermittently arranged The multi-segment gate line structure, wherein, in the first direction, the multi-segment gate line structure is at least aligned with the third section of the multi-segment main gate line, and the interval between the multi-segment gate line structure The portion is at least aligned with the first section of the multi-section grid line.
A manufacturing method for manufacturing the shingled assembly according to any one of claims 1-17, wherein the manufacturing method comprises the following steps:

Manufacturing a plurality of solar cell sheets, the plurality of solar cell sheets can be sequentially connected in a shingled manner in a first direction, each of the solar cell sheets includes a base sheet, the top surface and the bottom surface of the base sheet Each busbar line is provided, and the busbar line on at least one of the top surface and the bottom surface is a multi-section busbar line, and the multi-section busbar line includes a first section, a third Section and a second section connected between the first section and the third section, wherein: the second section and the third section are along a straight line on the surface where they are located Extend, and the first section extends away from the direction in which the second section and the third section extend so as to leave a space in the direction in which the second section and the third section extend. Used to apply the adhesive; the third section can directly contact the main grid lines of the adjacent solar cells so as to realize the conductive connection between the solar cells;

Applying an adhesive to the space left by the first section of each of the solar cells;

The plurality of solar cells are arranged in shingles along the first direction, are fixed to each other and make the third section of the main grid line of any two adjacent solar cells face each other direct contact.
The method of claim 34, wherein the step of manufacturing the plurality of solar cells comprises:

Pretreatment of the entire solar cell;

The whole solar cell sheet after the pretreatment is cut into small pieces to form the plurality of solar cell sheets.
The method according to claim 35, wherein the step of preprocessing the entire solar cell sheet comprises:

Making texturing on the surface of the total substrate sheet of the whole solar cell sheet;

An inner passivation layer is grown and deposited on both the front and back of the total substrate sheet;

Growing and depositing a middle passivation layer on the inner passivation layer;

An outer passivation layer is grown and deposited on the middle passivation layer.
The manufacturing method according to claim 36, wherein:

The inner passivation layer is deposited by thermal oxidation or laughing gas oxidation or ozonation or nitric acid solution chemical method, and the inner passivation layer is set as a silicon dioxide film layer; and/or

The middle passivation layer is deposited by a PECVD or ALD layer or a solid target material by a PVD layer method, and the middle passivation layer is set as an aluminum oxide film layer or a film layer containing aluminum oxide; and/or

The outer passivation layer is deposited by PVD, CVD or ALD method.
The method according to any one of 34-37, wherein the method does not include the step of applying conductive glue.