Photovoltaic module

Abstract

The invention relates to the photovoltaic field, and provides a photovoltaic module, which comprises a plurality of battery strings arranged along a first direction, each battery string comprises a plurality of battery pieces arranged along a second direction, every two adjacent battery pieces are electrically connected, the battery pieces positioned at the end parts of the battery strings along the second direction are edge battery pieces, and the edge battery pieces are arranged along the first direction. The edge battery piece comprises a first doped region and a second doped region; the insulating layer covers the surface of the edge battery piece; the conducting layer covers the surface of the insulating layer, the conducting layer comprises a first part and a second part which are spaced from each other, the first part is electrically connected with the first doped region, the second part is electrically connected with the second doped region, and the conducting layer on at least one edge battery piece is electrically connected with the conducting layer on the adjacent edge battery piece; the packaging adhesive film is used for covering the surface of the battery string; and the cover plate is used for covering the surface, far away from the battery string, of the packaging adhesive film, so that the reliability of the photovoltaic module can be improved.

Description

Technical Field

[0001] This disclosure relates to the photovoltaic field, and in particular to a photovoltaic module. Background Technology

[0002] Currently, with the gradual depletion of fossil fuels, solar cells are becoming increasingly widely used as a new energy alternative. Solar cells are devices that convert solar energy into electrical energy. They utilize the photovoltaic principle to generate charge carriers, which are then extracted using electrodes, thus facilitating the efficient use of electrical energy.

[0003] Photovoltaic modules are the core components of solar power generation systems. They convert light energy into electrical energy by connecting individual solar cells in series. Currently, current is usually achieved between cell strings using busbars. However, using busbars to achieve current connection between cell strings has the problems of complex manufacturing process and reduced reliability. Summary of the Invention

[0004] This disclosure provides a photovoltaic module that can at least improve the reliability of the photovoltaic module.

[0005] This disclosure provides a photovoltaic module, comprising: a plurality of cell strings arranged along a first direction, each cell string comprising: a plurality of cells arranged along a second direction, adjacent cells being electrically connected, the cells located at the ends of the cell string along the second direction being edge cells, the edge cells including a first doped region and a second doped region; an insulating layer covering the surface of the edge cells; a conductive layer covering the surface of the insulating layer, the conductive layer including a first portion and a second portion spaced apart from each other, the first portion being electrically connected to the first doped region, the second portion being electrically connected to the second doped region, and the conductive layer on at least one edge cell being electrically connected to the conductive layer on an adjacent edge cell; an encapsulating film covering the surface of the cell string; and a cover plate covering the surface of the encapsulating film away from the cell string.

[0006] Optionally, the battery string located at the end in the first direction is an edge battery string, wherein the conductive layer on one of the two edge battery cells in the edge battery string is electrically connected to the conductive layer on the edge battery cell of the adjacent battery string, and the conductive layer on the other of the two edge battery cells serves as an output terminal.

[0007] Optionally, the first part includes: a first connecting portion and a plurality of first protrusions arranged along the first direction, wherein the first connecting portion is electrically connected to the plurality of first protrusions; the second part includes: a second connecting portion and a plurality of second protrusions arranged along the first direction, wherein the second connecting portion is electrically connected to the plurality of second protrusions, wherein the second protrusions are staggered with the first protrusions and are spaced apart from the first protrusions, and at least a portion of the first connecting portion is electrically connected to the first connecting portion on the adjacent edge battery cell.

[0008] Optionally, along the second direction, the width of the first connecting portion is 3mm to 6mm, and / or the thickness is 200μm to 300μm.

[0009] Optionally, the first connecting portion further includes: a first movable portion, which can be folded along the first direction for electrically connecting with an adjacent second connecting portion; the second connecting portion further includes: a second movable portion, which can be folded along the first direction for electrically connecting with an adjacent first connecting portion.

[0010] Optionally, the battery string is also arranged along the second direction, and the photovoltaic module further includes: a third conductive layer, the third conductive layer being located on two adjacent edge cells along the second direction, and the third conductive layer being electrically connected to the two edge cells respectively.

[0011] Optionally, the width of the fifth connecting part is 3mm to 5mm, and the width of the sixth connecting part is 14mm to 18mm.

[0012] Optionally, the battery cell located between the edge battery cells in the battery string is a central battery cell. The central battery cell includes a third doped region and a fourth doped region. The third doped region has the same doping type as the first doped region, and the fourth doped region has the same doping type as the second doped region. The central battery cell is provided with a second insulating layer and a second conductive layer. The second insulating layer covers the central battery cell, and the second conductive layer covers the second insulating layer. The second conductive layer includes a third portion and a fourth portion spaced apart from each other. The third portion is electrically connected to the third doped region, and the fourth portion is electrically connected to the fourth doped region. The third portion located on one of two adjacent central battery cells is electrically connected to the fourth portion located on the other central battery cell.

[0013] Optionally, the third part includes: a third connecting portion and a plurality of third protrusions arranged along the first direction, wherein the third connecting portion is electrically connected to the plurality of third protrusions; the fourth part includes: a fourth connecting portion and a plurality of fourth protrusions arranged along the first direction, wherein the fourth connecting portion is electrically connected to the plurality of fourth protrusions, wherein in two adjacent second conductive layers, the third connecting portion of one layer at least partially overlaps with the fourth connecting portion of the other layer, the fourth protrusions are staggered with the third protrusions, and the fourth protrusions are spaced apart from the third protrusions.

[0014] Optionally, along the second direction, the width of the third connecting portion is 3mm to 5mm, and the thickness of the third connecting portion is 50μm to 70μm.

[0015] Optionally, the third conductive layer includes a fifth portion, a sixth portion, and a seventh portion spaced apart from each other. The fifth portion is electrically connected to one of the first doped regions or the second doped region of one edge cell. The sixth portion is electrically connected to the other of the first doped region or the second doped region of one edge cell and to the other of the first doped region or the second doped region of another edge cell. The seventh portion is electrically connected to one of the first doped region or the second doped region of another edge cell.

[0016] Optionally, the fifth part includes: a fifth connecting portion and a plurality of fifth protrusions arranged along the first direction, wherein the fifth connecting portion is electrically connected to the plurality of fifth protrusions; the sixth part includes: a sixth connecting portion and a plurality of sixth and seventh protrusions arranged along the first direction, wherein the sixth protrusions are located on the side of the sixth connecting portion facing the fifth part, and the seventh protrusions are located on the side of the sixth connecting portion facing the seventh part; the seventh part includes: a seventh connecting portion and a plurality of eighth protrusions arranged along the first direction, wherein the seventh connecting portion is electrically connected to the plurality of eighth protrusions; wherein the fifth protrusions and the sixth protrusions are staggered and spaced apart, and the seventh protrusions and the eighth protrusions are staggered and spaced apart.

[0017] Optionally, the battery string located at the end of the first direction is an edge battery string, and the battery string located between the edge battery strings is a central battery string. The sixth connecting part in the central battery string further includes a third movable part, which can be folded along the first direction, and adjacent third movable parts are connected to each other.

[0018] Optionally, along the second direction, the width of the sixth connecting portion is greater than that of the fifth connecting portion.

[0019] The technical solution provided in this disclosure has at least the following advantages: by using a conductive layer to replace the busbars on the edge cells, the reliability of the photovoltaic module can be improved while the conductive layer is hidden on the surface of the cell string. Compared with the use of busbars, the thickness of the conductive layer is lower, which can reduce the need to hide the conductive layer on the surface of the cell string and avoid increasing the height too much, thereby reducing the pressure on the cells during the subsequent formation of the encapsulation film and cover plate. At the same time, the conductive layer facilitates electrical connection with the cells, which can reduce the difficulty of the photovoltaic module formation process. Attached Figure Description

[0020] One or more embodiments are illustrated by way of example with corresponding pictures in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this disclosure or the conventional technology, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a partial structural schematic diagram of a photovoltaic module provided in an embodiment of the present disclosure; Figure 2 A partial cross-sectional view of a photovoltaic module provided in an embodiment of this disclosure; Figure 3 This is a schematic diagram of a battery string with an insulating layer on its surface provided in an embodiment of the present disclosure; Figure 4 A partial top view of a battery string provided in an embodiment of this disclosure; Figure 5 A partial top view of a photovoltaic module provided in an embodiment of this disclosure; Figure 6 This is a schematic diagram of the structure of a conductive layer provided in an embodiment of the present disclosure; Figure 7 This is a schematic diagram of another conductive layer provided in an embodiment of the present disclosure; Figure 8 Another partial top view of a photovoltaic module provided in an embodiment of this disclosure; Figure 9 This is a schematic diagram of the structure of a second conductive layer provided in an embodiment of the present disclosure; Figure 10 Another top view of a battery string provided in an embodiment of this disclosure; Figure 11Another partial top view of a photovoltaic module provided in an embodiment of this disclosure; Figure 12 A partial top view of another photovoltaic module is provided as an embodiment of this disclosure; Figure 13 This is a top view of a third conductive layer provided in an embodiment of the present disclosure.

[0022] Explanation of reference numerals in the attached figures: 100. Battery string; 110. Battery cell; 120. Edge battery cell; 101. Insulating layer; 102. Conductive layer; 112. First part; 122. Second part; 103. Encapsulating film; 104. Cover plate; 1121. First connecting part; 1122. First protrusion; 1221. Second connecting part; 1222. Second protrusion; 1123. First movable part; 1223. Second movable part; 130. Center battery cell; 105. Second insulating layer; 106. Second conductive layer; 116. Third part Parts; 126. Fourth part; 1161. Third connecting part; 1162. Third protrusion; 1262. Fourth protrusion; 1261. Fourth connecting part; 107. Third conductive layer; 117. Fifth part; 127. Sixth part; 137. Seventh part; 1171. Fifth connecting part; 1172. Fifth protrusion; 1271. Sixth connecting part; 1272. Sixth protrusion; 1273. Seventh protrusion; 1371. Seventh connecting part; 1372. Eighth protrusion; 1274. Third movable part. Detailed Implementation

[0023] Currently, photovoltaic (PV) modules typically employ two methods to connect cell strings: concealed busbars and non-concealed busbars. Concealed busbars overlap with the cell string, making them invisible on the side of the cell string away from the busbar, thus hiding it. Non-concealed busbars are located on one side of the cell string and spaced apart from it. Concealed busbars can increase the integration density and aesthetics of PV modules. However, concealed busbars often pose a risk of microcracks in the cells. The overlap between the busbar and the cell string increases the stress on the cells during subsequent lamination, potentially causing microcracks. Furthermore, concealed busbars increase the difficulty of manufacturing PV modules.

[0024] In the process of forming a concealed busbar, a coating is usually applied before forming the busbar to separate the busbar from the solder ribbon that does not need to be in contact, thereby preventing short circuits in the battery cells. A second coating is applied after the busbar and solder ribbon are connected to protect the solder ribbon, which makes the process complex.

[0025] In this embodiment, a conductive layer is used instead of the busbars on the edge cells. While hiding the conductive layer on the surface of the cell string, the reliability of the photovoltaic module can be improved. Compared with the use of busbars, the conductive layer is thinner, which can reduce the need to hide the conductive layer on the surface of the cell string and avoid increasing the height too much. This reduces the pressure on the cells during the subsequent formation of the encapsulation film and cover plate. At the same time, the conductive layer facilitates electrical connection with the cells, which can reduce the difficulty of the photovoltaic module formation process.

[0026] In the description of the embodiments of this disclosure, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0029] In the description of embodiments of this disclosure, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0030] In the description of the embodiments of this disclosure, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this disclosure.

[0031] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0032] In the accompanying drawings, the thickness of layers, films, panels, regions, etc., is enlarged for clarity. Throughout the specification, the same reference numerals denote the same elements. It should be understood that when referring to an element (e.g., a layer, film, region, or substrate) as being "on" another element, it may be directly on that other element, or intermediate elements may be present. Conversely, when referring to an element as being "directly on" another element, it indicates that no intermediate elements are present.

[0033] In the description of embodiments of this disclosure, when a component "includes" another component, other components are not excluded unless otherwise stated, and may be further included. Furthermore, when a component such as a layer, film, region, or plate is referred to as being "on / located" on another component, it can be "directly" on the other component (i.e., located on the surface of the other component with no other components between them), or another component may be present therein. Additionally, when a component such as a layer, film, region, or plate is "directly located" on another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it indicates that no other components are located therein.

[0034] In the description of the embodiments disclosed herein, electrical connection actually refers to the fact that one component and another component are both made of conductive materials, and the two components are in direct contact or connected via other conductive materials. Therefore, when in a power generation state, there is an electrical connection between the two components.

[0035] The terminology used in the description of the various embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description and claims of the various embodiments described, the term "component" is also intended to include the plural form unless the context clearly indicates otherwise. Components include layers, films, regions, or plates, etc.

[0036] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this disclosure to facilitate a better understanding of the disclosure. However, the technical solutions claimed in this disclosure can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0037] refer to Figures 1 to 5 ,in, Figure 1 This is a partial structural schematic diagram of a photovoltaic module provided in an embodiment of the present disclosure; Figure 2 Provided for an embodiment of this disclosure Figure 1 Cross-sectional view along the AA1 direction; Figure 3 This is a schematic diagram of a battery string with an insulating layer on its surface provided in an embodiment of the present disclosure; Figure 4 A partial top view of a battery string provided in an embodiment of this disclosure; Figure 5 This is a partial top view of a photovoltaic module provided in one embodiment of the present disclosure.

[0038] In some embodiments, a photovoltaic module may include: a plurality of cell strings 100 arranged along a first direction X, each cell string 100 including: a plurality of cell cells 110 arranged along a second direction Y, adjacent cell cells 110 being electrically connected, the cell cell 110 located at the end of the cell string 100 along the second direction Y being an edge cell cell 120, the edge cell cell 120 including a first doped region and a second doped region; an insulating layer 101 covering the surface of the edge cell cell 120; a conductive layer 102 covering the surface of the insulating layer 101, the conductive layer 102 including a first portion 112 and a second portion 122 spaced apart from each other, the first portion 112 being electrically connected to the first doped region, the second portion 122 being electrically connected to the second doped region, and the conductive layer 102 on at least one edge cell cell 120 being electrically connected to the conductive layer 102 on an adjacent edge cell cell 120.

[0039] The photovoltaic module may also include an encapsulating film 103, which is used to cover the surface of the cell string 100.

[0040] The photovoltaic module may also include a cover plate 104 for covering the surface of the encapsulating film 103 away from the cell string 100.

[0041] In this embodiment, a conductive layer 102 is used instead of the busbar on the edge cell 120. While hiding the conductive layer 102 on the surface of the cell string 100, the reliability of the photovoltaic module can be improved. Compared with the use of busbar, the conductive layer 102 has a lower thickness, which can reduce the need to hide the conductive layer 102 on the surface of the cell string 100 and avoid increasing the height too much. This reduces the pressure on the cell 110 during the subsequent formation of the encapsulation film 103 and the cover plate 104. At the same time, the conductive layer 102 facilitates electrical connection with the cell 110, which can reduce the difficulty of the photovoltaic module formation process.

[0042] The solar cell 110 may be, but is not limited to, one or any combination of PERC (Passivated Emitter Rear Cell), IBC (Interdigitated Back Contact), TOPCon (Tunnel Oxide Passivated Contact), HIT / HJT (Heterojunction Technology), thin-film solar cells, and tandem solar cells. Thin-film solar cells include, but are not limited to, perovskite thin-film solar cells, copper indium selenide (CIGS) thin-film solar cells, gallium arsenide (GaAs) thin-film solar cells, and cadmium sulfide (CdS) thin-film solar cells. Tandem solar cells include, but are not limited to, perovskite cells stacked with crystalline silicon cells, perovskite cells stacked with perovskite cells, and perovskite cells stacked with thin-film cells.

[0043] The solar cell 110 can be a monocrystalline silicon solar cell, a polycrystalline silicon solar cell, an amorphous silicon solar cell, or a multi-component compound solar cell. Specifically, the multi-component compound solar cell can be a cadmium sulfide solar cell, a gallium arsenide solar cell, a copper indium selenide solar cell, or a perovskite solar cell. Furthermore, the solar cell 110 can be a single cell or a sliced ​​cell; a sliced ​​cell refers to a cell formed by cutting a single, complete solar cell.

[0044] In some embodiments, the insulating layer 101 may cover the entire surface of the edge cell 120, and the insulating layer 101 is provided with a plurality of through holes, a first portion 112 passing through the through holes and electrically connected to the first doped region, and a second portion 122 passing through the through holes and electrically connected to the second doped region.

[0045] The insulating layer 101 can be made of PI (Polyimide) or PET (Polyethylene terephthalate).

[0046] In some embodiments, flux may also be provided in the through-hole to improve the connection reliability between the conductive layer 102 and the edge battery cell 120.

[0047] In some embodiments, the cell 110 is a back-contact solar cell, with a first portion 112 and a second portion 122 located on the back side of the cell 110.

[0048] In some embodiments, the conductive layer 102 was originally a monolithic structure, and then a portion of the conductive layer 102 was etched away by laser engraving to form a first portion 112 and a second portion 122 that are spaced apart from each other.

[0049] In some embodiments, the battery string 100 located at the end in the first direction X is an edge battery string. The conductive layer 102 on one of the two edge battery pieces 120 in the edge battery string is electrically connected to the conductive layer 102 on the edge battery piece 120 of the adjacent battery string 100. The conductive layer 102 on the other of the two edge battery pieces 120 serves as an output terminal. That is, the conductive layer 102 of the edge battery piece 120 in the edge battery string serves either as a terminal connected in series with the adjacent battery string 100 or as an output terminal.

[0050] For example, there are 10 battery strings 100 arranged along the first direction X. These 10 battery strings 100 are defined as the first battery string, the second battery string, and the tenth battery string. The first battery string and the tenth battery string are edge battery strings. The first battery string has 10 battery cells 110. The 10 battery cells 110 arranged along the second direction Y are the first battery cell, the second battery cell, and the tenth battery cell. The first battery cell and the tenth battery cell are edge battery cells 120. The conductive layer 102 on the first battery cell is used to connect in series with the second battery string, and the conductive layer 102 on the tenth battery cell serves as the output terminal.

[0051] By using the conductive layer 102 on the edge cell 120 as the output terminal, it is easy to extract the current signal. Setting the output terminal as the end can reduce the manufacturing difficulty of photovoltaic modules and the difficulty of extracting current.

[0052] Reference Figure 5 and Figure 6 , Figure 6 This is a schematic diagram of the structure of a conductive layer provided in an embodiment of the present disclosure.

[0053] In some embodiments, the first portion 112 includes: a first connecting portion 1121 and a plurality of first protrusions 1122 arranged along a first direction X, wherein the first connecting portion 1121 is electrically connected to the plurality of first protrusions 1122; the second portion 122 includes: a second connecting portion 1221 and a plurality of second protrusions 1222 arranged along a first direction X, wherein the second connecting portion 1221 is electrically connected to the plurality of second protrusions 1222, the second protrusions 1222 are staggered with the first protrusions 1122, and the second protrusions 1222 are spaced apart from the first protrusions 1122, and at least a portion of the first connecting portion 1121 is electrically connected to the second connecting portion 1221 on the adjacent edge battery cell 120.

[0054] The first connecting portion 1121 is used to connect in series with the adjacent battery string 100, and the first protrusion 1122 is used to replace the solder strip on the edge battery cell 120 to collect the charge carriers in the edge battery cell 120. The second connecting portion 1221 is used to connect in series with the adjacent battery string 100, and the second protrusion 1222 also replaces the solder strip on the edge battery cell 120 to collect the charge carriers in the edge battery cell 120.

[0055] The first connecting portion 1121 can extend along the first direction X, the first protrusion 1122 can extend along the second direction Y, the second connecting portion 1221 can extend along the first direction, and the second protrusion 1222 can extend along the second direction Y.

[0056] Continuing with the example of 10 battery strings 100 arranged along the first direction X, and defining the 10 battery strings 100 as the first battery string, the second battery string to the tenth battery string respectively, the first battery string has 10 battery pieces 110. The 10 battery pieces 110 arranged along the second direction Y are the first battery piece, the second battery piece to the tenth battery piece. The first connecting part 1121 on the first battery piece in the first battery string is connected to the second connecting part 1221 on the first battery piece in the second battery string. The second connecting part 1221 on the tenth battery piece in the first battery string can be used as an output terminal. The first connecting part 1121 on the tenth battery piece in the second battery string is connected to the second connecting part 1221 on the tenth battery piece in the third battery string, and so on, thereby realizing the series connection of the first battery string to the tenth battery string. At the same time, the second connecting part 1221 on the tenth battery piece of the first battery string and the first connecting part 1121 on the tenth battery piece of the tenth battery string are used as output terminals.

[0057] It is understandable that in two adjacent battery strings 100, the conductive layer 102 located at the edge of the second direction Y is one part 112 and the other part 122. The series connection between the two battery strings 100 is achieved by overlapping the first part 112 and the second part 122 in the two adjacent battery strings 100.

[0058] In some embodiments, the first protrusion 1122 is used to collect carriers from the first doped region and to aggregate the carriers from multiple first doped regions through the first connecting portion 1121, and the second protrusion 1222 is used to collect carriers from the second doped region and to aggregate them through the second connecting portion 1221.

[0059] In some embodiments, the width of the first connecting portion 1121 along the second direction Y can be 3mm to 6mm, for example, 3mm to 4mm or 4mm to 6mm, or even 3mm, 3.5mm, 4mm, 4.5mm, 5mm, or 6mm, etc. The wider the width of the first connecting portion 1121, the stronger its current transmission capability. However, if the first connecting portion 1121 is too wide, it will cover an excessively large area, occupying the space of the first protrusion 1122 and affecting the electrical connection between the first protrusion 1122 and the first doped region.

[0060] It should be noted that the width of the first connecting portion 1121 (hereinafter referred to as the first width) refers to the average width of each region in the first connecting portion 1121. In some cases, the width of each region in the first connecting portion 1121 is within the range of the first width; in other cases, the width of most regions in the first connecting portion 1121 is within the range of the first width, while the width of a small portion is not within the range of the first width, but the overall average width of the first connecting portion 1121 is the first width.

[0061] It should also be noted that, compared to the entire solar cell 110 / photovoltaic module, the width of the first connection portion 1121 is very small and the number of first connection portions 1121 is very large. Therefore, actual measurement cannot exhaustively measure all the widths of the first connection portions 1121. Instead, several sampling points are selected at different locations on the first connection portion 1121, and the average width of these sampling points is measured and calculated to obtain the average width of the first connection portion 1121. That is, the average width of the first connection portion 1121 can be measured using a sampling method. For example, the average width of five sampling points in the first connection portion 1121 can be measured and calculated as the average width of the first connection portion 1121.

[0062] The thickness of the first connecting portion 1121 can be 200μm to 300μm, for example, 200μm to 250μm or 250μm to 300μm, etc., or it can be 200μm, 220μm, 250μm, 280μm or 300μm, etc. The thicker the first connecting portion 1121, the lower its resistance and the stronger its transmission performance. However, if the first connecting portion 1121 is too thick, it will result in an excessively thick photovoltaic module.

[0063] It should be noted that the thickness of the first connecting portion 1121 (hereinafter referred to as the first thickness) refers to the average thickness of each region in the first connecting portion 1121. In some cases, the thickness of each region in the first connecting portion 1121 is within the range of the first thickness; in other cases, the thickness of most regions in the first connecting portion 1121 is within the range of the first thickness, while the thickness of a small portion is not within the range of the first thickness, but the overall average width of the first connecting portion 1121 is the first thickness.

[0064] It should also be noted that, since the thickness of the first connection portion 1121 is very small compared to the entire solar cell 110 / photovoltaic module, and the number of first connection portions 1121 is very large, actual measurement cannot exhaustively measure the thickness of the entire first connection portion 1121. Instead, several sampling points are selected at different locations on the first connection portion 1121, and the average thickness of these sampling points is measured and calculated to obtain the average thickness of the first connection portion 1121. That is, the average thickness of the first connection portion 1121 can be measured using a sampling method. For example, the average thickness of 5 sampling points in the first connection portion 1121 can be measured and calculated as the average thickness of the first connection portion 1121.

[0065] In some embodiments, the width of the second connecting portion 1221 can be 3mm to 6mm, for example, 3mm to 4mm or 4mm to 6mm, or even 3mm, 3.5mm, 4mm, 4.5mm, 5mm, or 6mm. The wider the width of the second connecting portion 1221, the stronger its current transmission capability. However, if the second connecting portion 1221 is too wide, it will cover an excessively large area, occupying space in the second protrusion 1222 and affecting the electrical connection between the second protrusion 1222 and the second doped region.

[0066] The thickness of the second connection portion 1221 can be 200μm to 300μm, for example, 200μm to 250μm or 250μm to 300μm, etc., or it can be 200μm, 220μm, 250μm, 280μm or 300μm, etc. The thicker the second connection portion 1221, the lower its resistance and the stronger its transmission performance. However, if the second connection portion 1221 is too thick, it will result in an excessively thick photovoltaic module.

[0067] The description of the width and thickness of the second connecting part 1221 can be found in the description of the first connecting part 1121 above, and will not be repeated here.

[0068] It is understandable that by setting the first protrusion 1122 and the second protrusion 1222, the conductive layer 102 can be used to replace the solder strip, so that the solder strip and the busbar can be welded to the battery cell 110 in the same process step, thereby reducing the number of process steps. At the same time, the conductive layer 102 covers the surface of the battery cell 110. Compared with the busbar being located on the surface of the battery cell 110, the conductive layer 102 is arranged in a whole layer. Compared with only setting the busbar, the conductive layer 102 arranged in a whole layer will not generate local pressure and can also reduce the risk of microcracks in the battery cell 110.

[0069] In some embodiments, the battery cell 110 located between the edge battery cells 120 in the battery string 100 is the center battery cell 130. The series connection between the center battery cells 130 can be achieved by soldering ribbons. The connection between the center battery cell 130 and the edge battery cells 120 can be achieved by the connection between the soldering ribbons and the conductive layer 102.

[0070] refer to Figure 7 , Figure 7 This is a schematic diagram of another conductive layer provided in an embodiment of the present disclosure.

[0071] In some embodiments, the first connecting portion 1121 further includes a first movable portion 1123, which is foldable along a first direction X for electrical connection with an adjacent second connecting portion 1221; the second connecting portion 1221 further includes a second movable portion 1223, which is foldable along the first direction X for electrical connection with an adjacent first connecting portion 1121. In other words, the first movable portion 1123 is provided in the first connecting portion 1121, and the second movable portion 1223 is provided in the second connecting portion 1221. When it is necessary to connect the first connecting portion 1121 and the second connecting portion 1221 in series, the first movable portion 1123 and the second movable portion 1223 are folded and moved, thereby overlapping the first movable portion 1123 with the second connecting portion 1221 and overlapping the second movable portion 1223 with the first connecting portion 1121, thereby realizing the series connection between different battery strings 100.

[0072] In some embodiments, a portion of the first connecting portion 1121 may be cut to form a first movable portion 1123. During the cutting process, the portion of the first movable portion 1123 may be controlled to remain connected to the uncut portion of the first connecting portion 1121. In other words, the first movable portion 1123 includes a fixed end and a movable end. The fixed end remains connected to the uncut portion of the first connecting portion 1121, and the movable end is movable. When it is necessary for the first movable portion 1123 to overlap with the second connecting portion 1221, the movable end can be moved and controlled to overlap with the second connecting portion 1221.

[0073] The second activity section 1223 can be referred to in the above description of the first activity section 1123, and will not be repeated here.

[0074] refer to Figure 8 , Figure 8 Another partial top view of a photovoltaic module provided in an embodiment of this disclosure.

[0075] In some embodiments, the battery cell 110 located between the edge battery cells 120 in the battery string 100 is the central battery cell 130. The central battery cell 130 includes a third doped region and a fourth doped region. The third doped region has the same doping type as the first doped region, and the fourth doped region has the same doping type as the second doped region. The central battery cell 130 is provided with a second insulating layer 105 and a second conductive layer 106. The second insulating layer 105 covers the central battery cell 130, and the second conductive layer 106 covers the second insulating layer 105. The second conductive layer 106 includes a third portion 116 and a fourth portion 126 spaced apart from each other. The third portion 116 is electrically connected to the third doped region, and the fourth portion 126 is electrically connected to the fourth doped region. The third portion 116 located on one of two adjacent central battery cells 130 is electrically connected to the fourth portion 126 located on the other central battery cell 130.

[0076] In other words, the solder ribbons in the battery string 100 are all replaced by the second conductive layer 106. Thus, during the formation of the entire battery string 100, the solder ribbons and busbars are formed simultaneously, thereby reducing the number of process steps in forming the photovoltaic module. At the same time, since the solder ribbons and busbars are replaced by the conductive layer 102 and the second conductive layer 106, the protruding parts on the surface of the battery string 100 are reduced, thereby reducing the local stress during the subsequent formation of the encapsulation film 103 and the cover plate 104, which also improves the reliability of the photovoltaic module.

[0077] In some embodiments, the thickness of the second conductive layer 106 may be the same as the thickness of the conductive layer 102, thereby further reducing the height difference on the back side of the battery string 100, further reducing the generation of local stress, and reducing the possibility of microcracks in the battery string 100.

[0078] The second insulating layer 105 may have a second through hole, through which the second conductive layer 106 passes and is electrically connected to the central battery cell 130.

[0079] During the process of connecting the second conductive layer 106, some of the second conductive layer 106 can be stacked and laser welded.

[0080] The material of the second insulating layer 105 can be the same as that of the insulating layer 101, and can be PI material or PET material.

[0081] In some embodiments, the insulating layer 101 and the second insulating layer 105 can also be an integral structure, thereby reducing the process steps of covering the insulating layer 101 and the second insulating layer 105 and reducing the process cost of photovoltaic modules.

[0082] Reference Figure 8 and Figure 9 , Figure 9 This is a schematic diagram of the structure of a second conductive layer provided in an embodiment of the present disclosure.

[0083] In some embodiments, the third portion 116 includes a third connecting portion 1161 and a plurality of third protrusions 1162 arranged along the first direction X, wherein the third connecting portion 1161 is electrically connected to the plurality of third protrusions 1162; the fourth portion 126 includes a fourth connecting portion 1261 and a plurality of fourth protrusions 1262 arranged along the first direction X, wherein the fourth connecting portion 1261 is electrically connected to the plurality of fourth protrusions 1262, wherein in two adjacent second conductive layers 106, the third connecting portion 1161 of one layer and the fourth connecting portion 1261 of the other layer at least partially overlap, the fourth protrusions 1262 and the third protrusions 1162 are arranged alternately, and the fourth protrusions 1262 and the third protrusions 1162 are spaced apart.

[0084] The staggered arrangement of the third protrusion 1162 and the fourth protrusion 1262 in the back contact battery corresponds to the alternating arrangement of the first doped region and the second doped region. The third protrusion 1162 and the fourth protrusion 1262 collect the carriers in the first doped region and the second doped region, respectively, and they are combined through the third connection 1161 and the fourth connection 1261. The third connection 1161 and the fourth connection 1261 overlap at least partially to achieve series connection between the central battery cells 130, thereby connecting the entire battery string 100 in series.

[0085] In some embodiments, the width of the third connecting portion 1161 along the second direction Y is 3mm to 5mm, for example, it can be 3mm to 4mm or 4mm to 5mm, etc., or it can be 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc. The wider the width of the third connecting portion 1161, the stronger its current transmission capability. At the same time, if the third connecting portion 1161 is too wide, it will result in the third connecting portion 1161 covering an excessively large area, occupying the space of the third protrusion 1162, and affecting the electrical connection between the third protrusion 1162 and the third doped region.

[0086] The width of the third connection part 1161 can be smaller than the width of the first connection part 1121. It can be understood that the first connection part 1121 is connected to the adjacent battery string 100 or serves as the output terminal of the photovoltaic module, while the third connection part 1161 serves as the connection port between the battery cells 110. The current carried by the first connection part 1121 is greater than the current carried by the third connection part 1161. Therefore, the width of the first connection part 1121 is set to be greater than that of the third connection part 1161 to match the current output of the photovoltaic module and improve the reliability of the photovoltaic module.

[0087] The thickness of the third connection portion 1161 is 50μm to 70μm, for example, it can be 50μm to 60μm or 60μm to 70μm, etc., or it can be 50μm, 55μm, 60μm, 65μm or 70μm, etc. The thicker the third connection portion 1161, the lower its resistance and the stronger its transmission performance. However, if the third connection portion 1161 is too thick, it will result in an excessively thick photovoltaic module.

[0088] The thickness of the third connection portion 1161 can be less than the width of the first connection portion 1121. Similarly, the first connection portion 1121 is connected to the adjacent battery string 100 or serves as the output terminal of the photovoltaic module, while the third connection portion 1161 serves as the connection port between the battery cells 110. The current carried by the first connection portion 1121 is greater than the current carried by the third connection portion 1161. Therefore, the width of the first connection portion 1121 is set to be greater than that of the third connection portion 1161 to match the current output of the photovoltaic module and improve the reliability of the photovoltaic module.

[0089] The description of the width and thickness of the third connecting part 1161 can be found in the description of the first connecting part 1121 above, and will not be repeated here.

[0090] Along the second direction Y, the width of the fourth connecting portion 1261 is 3mm to 5mm, for example, it can be 3mm to 4mm or 4mm to 5mm, or it can be 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc. The wider the width of the fourth connecting portion 1261, the stronger its current transmission capability. However, if the fourth connecting portion 1261 is too wide, it will cover an excessively large area, occupying the space of the fourth protrusion 1262 and affecting the electrical connection between the fourth protrusion 1262 and the fourth doped region.

[0091] The thickness of the fourth connection portion 1261 is 50μm to 70μm, for example, it can be 50μm to 60μm or 60μm to 70μm, etc., or it can be 50μm, 55μm, 60μm, 65μm or 70μm, etc. The thicker the fourth connection portion 1261, the lower its resistance and the stronger its transmission performance. However, if the fourth connection portion 1261 is too thick, it will result in an excessively thick photovoltaic module.

[0092] The description of the width and thickness of the fourth connecting part 1261 can be found in the description of the third connecting part 1161 above, and will not be repeated here.

[0093] refer to Figure 10 and Figure 11 , Figure 10 Another top view of a battery string provided in an embodiment of this disclosure; Figure 11 This is yet another partial top view of a photovoltaic module provided in an embodiment of the present disclosure.

[0094] In some embodiments, the battery strings 100 are also arranged along the second direction Y. The photovoltaic module further includes a third conductive layer 107, which is located on two adjacent edge cells 120 along the second direction Y and is electrically connected to the two edge cells 120 respectively. In other words, the battery cells 110 arranged along the second direction Y are electrically connected by the third conductive layer 107, thereby forming the entire photovoltaic module as a whole. The current from different battery strings 100 can be collected and output through the third conductive layer 107.

[0095] The battery strings 100 are grouped. Multiple battery strings 100 arranged along the first direction X are defined as battery string groups. The battery strings 100 are also arranged along the second direction Y, meaning there are multiple battery string groups arranged along the second direction Y. Taking two battery string groups as an example, the battery string groups arranged along the second direction Y are defined as the first battery string group and the second battery string group. The first battery string group contains 10 battery strings 100, which are defined as the first battery string, the second battery string, up to the tenth battery string. The first and tenth battery strings are the edge battery strings. Each battery string 100 has 10 battery cells 110. The 10 battery cells 110 arranged along the second direction Y are... The first, second, and tenth battery cells are designated as edge battery cells 120. The second battery string group contains 10 battery strings 100, which are defined as the eleventh, twelfth, and twentieth battery strings, respectively. The eleventh and twentieth battery strings are edge battery strings. Each battery string 100 contains 10 battery cells 110. The 10 battery cells 110 arranged along the second direction Y are designated as the first, second, and tenth battery cells. The first and eleventh battery strings are arranged along the second direction Y, the second and twelfth battery strings are arranged along the second direction Y, and so on.

[0096] The tenth cell of the first battery string and the first cell of the eleventh battery string are electrically connected through the third conductive layer 107. In some embodiments, the first battery string and the eleventh battery string can be connected in series. In this case, one end of the third conductive layer 107 is connected to one of the first doped region or the second doped region of the tenth cell in the first battery string, and the other end is connected to the other of the first doped region or the second doped region of the first cell in the eleventh battery string. In other embodiments, the first battery string and the eleventh battery string are connected in parallel. In this case, both ends of the third conductive layer 107 are connected to the same first doped region or the same second doped region in the tenth cell of the first battery string and the first cell of the eleventh battery string.

[0097] In some embodiments, the third conductive layer 107 located on two adjacent edge battery cells 120 along the second direction Y can be a separate type. For example, the third conductive layer 107 located on the tenth battery cell in the first battery string and the first battery cell in the eleventh battery string can be electrically connected by overlapping or welding. The third conductive layer 107 located on two adjacent edge battery cells 120 along the second direction Y can also be an integral type. For example, the third conductive layer 107 located on the tenth battery cell in the first battery string and the first battery cell in the eleventh battery string can be a whole.

[0098] It should be noted that the term "integrated" for the third conductive layer 107 does not mean that the third conductive layer 107 is a single, complete unit, but rather that the third conductive layer 107 is cut from a single unit.

[0099] Furthermore, the two battery strings 100 arranged along the second direction Y are connected in parallel. The two ends of the conductive layer 102 are connected to the first battery cells in the first battery string and the second battery string. The two ends of the third conductive layer 107 are connected to the first battery cells in the tenth and eleventh battery strings in the first battery string. The third conductive layer 107 on the first battery cells in the tenth and eleventh battery strings in the first battery string serves as the output terminal. The third conductive layer 107 on the first battery cells in the tenth and twelfth battery strings in the second battery string is also connected in series with the third conductive layer 107 on the first battery cells in the tenth and thirteenth battery strings in the third battery string. The first battery cells in the third battery string and the first battery cells in the fourth battery string are also connected in series through the conductive layer 102. And so on, forming an "S"-shaped circuit path in the first battery string group.

[0100] refer to Figure 12 , Figure 12 A partial top view of another photovoltaic module is provided for one embodiment of this disclosure.

[0101] In the battery string 100, the battery cell 110 located between the edge battery cells 120 is the central battery cell 130. The central battery cell 130 includes a third doped region and a fourth doped region. The third doped region has the same doping type as the first doped region, and the fourth doped region has the same doping type as the second doped region. The central battery cell 130 is provided with a second insulating layer 105 and a second conductive layer 106. The second insulating layer 105 covers the central battery cell 130, and the second conductive layer 106 covers the second insulating layer 105. The second conductive layer 106 includes a third portion 116 and a fourth portion 126 spaced apart from each other. The third portion 116 is electrically connected to the third doped region, and the fourth portion 126 is electrically connected to the fourth doped region. The third portion 116 located on one of two adjacent central battery cells 130 is electrically connected to the fourth portion 126 located on the other central battery cell 130.

[0102] In other words, the solder ribbons in different cell strings 100 are all replaced by the second conductive layer 106. Thus, during the formation of the entire cell string 100, the solder ribbons and busbars are formed simultaneously, thereby reducing the number of process steps in forming the photovoltaic module. At the same time, since the solder ribbons and busbars are replaced by the conductive layer 102 and the second conductive layer 106, the protruding parts on the surface of the cell string 100 are reduced, thereby reducing the local stress during the subsequent formation of the encapsulation film 103 and the cover plate 104, which also improves the reliability of the photovoltaic module.

[0103] The third part 116 includes a third connecting portion 1161 and a plurality of third protrusions 1162 arranged along the first direction X, wherein the third connecting portion 1161 is electrically connected to the plurality of third protrusions 1162; the fourth part 126 includes a fourth connecting portion 1261 and a plurality of fourth protrusions 1262 arranged along the first direction X, wherein the fourth connecting portion 1261 is electrically connected to the plurality of fourth protrusions 1262, wherein in two adjacent second conductive layers 106, the third connecting portion 1161 of one layer and the fourth connecting portion 1261 of the other layer at least partially overlap, the fourth protrusions 1262 and the third protrusions 1162 are arranged alternately, and the fourth protrusions 1262 and the third protrusions 1162 are spaced apart.

[0104] The staggered arrangement of the third protrusion 1162 and the fourth protrusion 1262 in the back contact battery corresponds to the alternating arrangement of the first doped region and the second doped region. The third protrusion 1162 and the fourth protrusion 1262 collect the carriers in the first doped region and the second doped region, respectively, and they are combined through the third connection 1161 and the fourth connection 1261. The third connection 1161 and the fourth connection 1261 overlap at least partially to achieve series connection between the central battery cells 130, thereby connecting the entire battery string 100 in series.

[0105] The central solar cell 130, the second conductive layer 106, the second insulating layer 105, the third part 116, and the fourth part 126 can be referred to the description above, and will not be repeated here.

[0106] refer to Figures 11 to 13 ,in, Figure 13 This is a top view of a third conductive layer provided in an embodiment of the present disclosure.

[0107] In some embodiments, the third conductive layer 107 includes a fifth portion 117, a sixth portion 127, and a seventh portion 137 spaced apart from each other. The fifth portion 117 is electrically connected to one of the first or second doped regions of an edge cell 120. The sixth portion 127 is electrically connected to the other of the first or second doped regions of one edge cell 120 and to the other of the first or second doped regions of another edge cell 120. The seventh portion 137 is electrically connected to the first or second doped region of another edge cell 120. The fifth portion 117, the sixth portion 127, and the seventh portion 137 cooperate to connect two adjacent cell strings 100 in parallel.

[0108] Taking the fifth part 117 connected to the first doped region of an edge cell 120 as an example, the sixth part 127 is connected to the second doped region of the edge cell 120 and to the second doped region of another edge cell 120, and the seventh part 137 is connected to the first doped region of another edge cell 120. That is to say, the fifth part 117 and the seventh part 137 collect the same type of carriers, while the fifth part 117 and the sixth part 127 collect different types of carriers.

[0109] When the third conductive layer 107 is a single piece, the fifth part 117, the sixth part 127 and the seventh part 137 are arranged at intervals after being cut from a single piece.

[0110] In some embodiments, the fifth portion 117 is connected to the adjacent fourth portion 126, and the seventh portion 137 is connected to the adjacent third portion 116 to form a conduction loop for the entire photovoltaic module.

[0111] In two adjacent third conductive layers 107 along the first direction X, one fifth portion 117 is electrically connected to one of the first doped regions or the second doped region of one edge cell 120, and the other fifth portion 117 is electrically connected to the other of the first doped region or the second doped region of the other edge cell 120. For example, the fifth portion 117 of one third conductive layer 107 is connected to the first doped region of one edge cell 120, and the fifth portion 117 of the other third conductive layer 107 is connected to the second doped region of the other edge cell 120. That is, each portion of two adjacent third conductive layers 107 along the first direction X collects different types of charge carriers.

[0112] In some embodiments, the fifth portion 117 includes a fifth connecting portion 1171 and a plurality of fifth protrusions 1172 arranged along a first direction X, wherein the fifth connecting portion 1171 is electrically connected to the plurality of fifth protrusions 1172; the sixth portion 127 includes a sixth connecting portion 1271 and a plurality of sixth protrusions 1272 and seventh protrusions 1273 arranged along a first direction X, wherein the sixth protrusions 1272 are located on the side of the sixth connecting portion 1271 facing the fifth portion 117, and the seventh protrusions 1273 are located on the side of the sixth connecting portion 1271 facing the fifth portion 117. 71 is oriented toward the side of the seventh part 137; the seventh part 137 includes: a seventh connecting part 1371 and a plurality of eighth protrusions 1372 arranged along the first direction X, the seventh connecting part 1371 being electrically connected to the plurality of eighth protrusions 1372; wherein, the fifth protrusion 1172 and the sixth protrusion 1272 are arranged alternately and spaced apart, the seventh protrusion 1273 and the eighth protrusion 1372 are arranged alternately and spaced apart.

[0113] The fifth protrusion 1172 is electrically connected to the first doped region or the second doped region. The fifth connecting part 1171 is used to collect the carriers collected by the fifth protrusion 1172. The sixth protrusion 1272 and the seventh protrusion 1273 are electrically connected to the second doped region or the first doped region of different edge cells 120, respectively. The sixth connecting part 1271 is used to collect the carriers collected on the sixth protrusion 1272 and the seventh protrusion 1273. Through the cooperation of the sixth protrusion 1272, the seventh protrusion 1273 and the sixth connecting part 1271, the parallel connection of different edge cells 120 can be realized. The eighth protrusion 1372 is electrically connected to the first doped region or the second doped region. The seventh connecting part 1371 is used to collect the carriers collected by the eighth protrusion 1372.

[0114] Furthermore, in two adjacent third conductive layers 107 along the first direction X, the fifth protrusion 1172 of one is connected to the first doped region, the fifth protrusion 1172 of the other is connected to the second doped region, the sixth protrusion 1272 of one is connected to the second doped region, the sixth protrusion 1272 of the other is connected to the first doped region, the eighth protrusion 1372 of one is connected to the first doped region, and the eighth protrusion 1372 of the other is connected to the second doped region.

[0115] In some embodiments, the battery string 100 located at the end of the first direction X is the edge battery string, and the battery string 100 located between the edge battery strings is the center battery string. The sixth connecting portion 1271 in the center battery string further includes a third movable portion 1274, which can be folded along the first direction X, and adjacent third movable portions 1274 are connected to each other. That is, the center battery string is also connected in series through the third movable portions 1274 to electrically connect the battery strings 100 arranged along the second direction Y, thereby completing the electrical connection of the entire photovoltaic module.

[0116] Two battery string groups arranged along the second direction Y are defined as the first battery string group and the second battery string group. The first battery string group has 10 battery strings 100, which are defined as the first battery string, the second battery string to the tenth battery string. The first battery string and the tenth battery string are the edge battery strings, and the rest are the center battery strings. The second battery string group also has 10 battery strings 100, which are defined as the eleventh battery string, the twelfth battery string to the twentieth battery string. The eleventh battery string and the twentieth battery string are the edge battery strings, and the rest are the center battery strings. The second battery string and the twelfth battery string are connected in parallel through the sixth connecting part 1271. At the same time, the second battery string and the third battery string are connected in series through the third moving part 1274.

[0117] The connection relationship between the first battery string group and the second battery string group will be further explained below with reference to the accompanying drawings.

[0118] In the first battery string group, the first battery string and the second battery string are connected in series through the conductive layer 102, the second battery string and the third battery string are connected in series through the third movable part 1274 of the third conductive layer 107, the third battery string and the fourth battery string are connected in series through the conductive layer 102, and so on.

[0119] In the second battery string group, the eleventh battery string and the twelfth battery string are connected in series through the conductive layer 102, the twelfth battery string and the thirteenth battery string are connected in series through the third movable part 1274 of the third conductive layer 107, the thirteenth battery string and the fourteenth battery string are connected in series through the third movable part 1274 of the third conductive layer 107, and so on.

[0120] Meanwhile, the first battery string and the eleventh battery string are connected in parallel through the third conductive layer 107. The third conductive layer 107 located on the first battery string and the eleventh battery string can serve as an output terminal. The second battery string and the twelfth battery string are connected in parallel through the third conductive layer 107. The third battery string and the thirteenth battery string are connected in parallel through the third conductive layer 107. The second battery string, the third battery string, the twelfth battery string and the thirteenth battery string are interconnected through the third conductive layer 107, and so on.

[0121] In some embodiments, along the second direction Y, the width of the sixth connection portion 1271 is greater than that of the fifth connection portion 1171. It is understood that the fifth connection portion 1171 is used to collect charge carriers from one string of cells 100, and the sixth connection portion 1271 is used to collect charge carriers from two adjacent strings of cells 100. Setting the width of the sixth connection portion 1271 to be larger accommodates more charge carriers, thereby further improving the performance of the photovoltaic module.

[0122] In some embodiments, the width of the fifth connecting portion 1171 is 3mm to 5mm, for example, it can be 3mm to 4mm or 4mm to 5mm, or it can be 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc. The wider the width of the fifth connecting portion 1171, the stronger its current transmission capability. However, if the fifth connecting portion 1171 is too wide, it will cover an excessively large area, occupying space of the fifth protrusion 1172 and affecting the electrical connection between the fifth protrusion 1172 and the first doped region or the second doped region.

[0123] In some embodiments, the width of the sixth connection portion 1271 is 14mm to 18mm, for example, it can be 14mm to 16mm or 16mm to 18mm, etc., or it can be 14mm, 15mm, 16mm, 17mm or 18mm, etc. On the one hand, the sixth connection portion 1271 is located between two adjacent battery strings 100, and the spacing between the adjacent battery strings 100 is larger. On the other hand, the sixth connection portion 1271 collects the charge carriers of the two adjacent battery strings 100. Setting a larger width can reduce the contact resistance of the sixth connection portion 1271, thereby improving the performance of the photovoltaic module.

[0124] In some embodiments, the conductive layer 102, the second conductive layer 106, and the third conductive layer 107 can all be copper foil. Taking the conductive layer 102 as an example, a low-temperature lamination process can be used in the process of connecting the conductive layer 102 to the battery string 100, with the temperature controlled at 140°C to 160°C, thereby reducing the impact of high temperature on the photovoltaic module and further improving the reliability of the photovoltaic module.

[0125] refer to Figure 1 and Figure 2 In some embodiments, the encapsulating film 103 includes a first encapsulating layer and a second encapsulating layer. The first encapsulating layer covers one of the front or back sides of the solar cell, and the second encapsulating layer covers the other of the front or back sides of the solar cell. Specifically, at least one of the first or second encapsulating layer can be an organic encapsulating film such as polyvinyl butyral (PVB) film, ethylene-vinyl acetate copolymer (EVA) film, polyvinyl octene elastomer (POE) film, or polyethylene terephthalate (PET) film. Alternatively, at least one of the first or second encapsulating layer can also be an EP film, an EPE film, or a PVP film. Here, the EP film refers to a co-extruded film composed of stacked EVA film and POE film; the EPE film refers to a co-extruded film formed by sequentially stacking EVA film + POE film + EVA film; and the PVP film refers to a co-extruded film formed by stacking POE film + EVA film + POE film. Co-extruded films can be prepared by sequentially extruding one or more raw materials onto another pre-made film during the film processing, or by bonding different types of pre-made films together.

[0126] In some cases, the first encapsulation layer and the second encapsulation layer still have a boundary line before lamination. After lamination, the photovoltaic module will no longer have the concept of a first encapsulation layer and a second encapsulation layer. That is, the first encapsulation layer and the second encapsulation layer have formed an integral encapsulation film 103.

[0127] In some embodiments, the cover plate 104 can be a glass cover plate, a plastic cover plate, or other cover plate with light-transmitting function. Specifically, the surface of the cover plate 104 facing the encapsulating film 103 can be an uneven surface or a textured surface containing multiple raised structures, thereby increasing the utilization rate of incident light. The cover plate 104 includes a first cover plate and a second cover plate, the first cover plate being opposite to the first encapsulation layer, and the second cover plate being opposite to the second encapsulation layer.

[0128] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the embodiments of this disclosure. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the embodiments of this disclosure; therefore, the scope of protection of the embodiments of this disclosure should be determined by the scope defined in the claims.

Claims

1. A photovoltaic module, characterized in that, include: A plurality of battery strings arranged along a first direction, each battery string comprising: a plurality of battery cells arranged along a second direction, adjacent battery cells being electrically connected, the battery cells located at the end of the battery string along the second direction being edge battery cells, the edge battery cells including a first doped region and a second doped region; an insulating layer covering the surface of the edge battery cells; a conductive layer covering the surface of the insulating layer, the conductive layer including a first portion and a second portion spaced apart from each other, the first portion being electrically connected to the first doped region, the second portion being electrically connected to the second doped region, and the conductive layer on at least one edge battery cell being electrically connected to the conductive layer on an adjacent edge battery cell; An encapsulating film, the encapsulating film being used to cover the surface of the battery string; A cover plate for covering the surface of the encapsulating film away from the battery string.

2. The photovoltaic module according to claim 1, characterized in that, The battery string located at the end in the first direction is an edge battery string. The conductive layer on one of the two edge battery cells in the edge battery string is electrically connected to the conductive layer on the edge battery cell of the adjacent battery string, and the conductive layer on the other of the two edge battery cells serves as an output terminal.

3. The photovoltaic module according to claim 1 or 2, characterized in that, The first part includes: a first connecting portion and a plurality of first protrusions arranged along the first direction, wherein the first connecting portion is electrically connected to the plurality of first protrusions; The second part includes: a second connecting portion and a plurality of second protrusions arranged along the first direction, the second connecting portion being electrically connected to the plurality of second protrusions, the second protrusions being staggered with the first protrusions and spaced apart from the first protrusions, and at least a portion of the first connecting portion being electrically connected to the second connecting portion on the adjacent edge battery cell.

4. The photovoltaic module according to claim 3, characterized in that, Along the second direction, the width of the first connecting portion is 3mm to 6mm, and / or the thickness is 200μm to 300μm.

5. The photovoltaic module according to claim 3, characterized in that, The first connecting portion further includes: a first movable portion, which can be folded along the first direction for electrical connection with an adjacent second connecting portion; The second connecting portion further includes a second movable portion, which can be folded along the first direction for electrical connection with an adjacent first connecting portion.

6. The photovoltaic module according to claim 1, characterized in that, The battery string is also arranged along the second direction, and the photovoltaic module further includes a third conductive layer, which is located on two adjacent edge cells along the second direction and is electrically connected to the two edge cells respectively.

7. The photovoltaic module according to claim 2 or 6, characterized in that, The battery cell located between the edge battery cells in the battery string is the central battery cell. The central battery cell includes a third doped region and a fourth doped region. The third doped region has the same doping type as the first doped region, and the fourth doped region has the same doping type as the second doped region. The central battery cell is provided with a second insulating layer and a second conductive layer. The second insulating layer covers the central battery cell, and the second conductive layer covers the second insulating layer. The second conductive layer includes a third portion and a fourth portion that are spaced apart from each other. The third portion is electrically connected to the third doped region, and the fourth portion is electrically connected to the fourth doped region. The third portion located on one of two adjacent central battery cells is electrically connected to the fourth portion located on the other central battery cell.

8. The photovoltaic module according to claim 7, characterized in that, The third part includes: a third connecting part and a plurality of third protrusions arranged along the first direction, wherein the third connecting part is electrically connected to the plurality of third protrusions; The fourth part includes: a fourth connecting portion and a plurality of fourth protrusions arranged along the first direction. The fourth connecting portion is electrically connected to the plurality of fourth protrusions. In two adjacent second conductive layers, the third connecting portion of one layer and the fourth connecting portion of the other layer at least partially overlap. The fourth protrusions and the third protrusions are arranged alternately and spaced apart from each other.

9. The photovoltaic module according to claim 8, characterized in that, Along the second direction, the width of the third connecting part is 3mm to 5mm, and the thickness of the third connecting part is 50μm to 70μm.

10. The photovoltaic module according to claim 6, characterized in that, The third conductive layer includes a fifth portion, a sixth portion, and a seventh portion spaced apart from each other. The fifth portion is electrically connected to one of the first doped regions or the second doped region of one of the edge solar cells. The sixth portion is electrically connected to the other of the first doped region or the second doped region of one of the edge solar cells and to the other of the first doped region or the second doped region of another edge solar cell. The seventh portion is electrically connected to one of the first doped region or the second doped region of another edge solar cell.

11. The photovoltaic module according to claim 10, characterized in that, The fifth part includes: a fifth connecting part and a plurality of fifth protrusions arranged along the first direction, wherein the fifth connecting part is electrically connected to the plurality of fifth protrusions; The sixth part includes: a sixth connecting part and a plurality of sixth protrusions and seventh protrusions arranged along the first direction, wherein the sixth protrusions are located on the side of the sixth connecting part facing the fifth part, and the seventh protrusions are located on the side of the sixth connecting part facing the seventh part; The seventh part includes: a seventh connecting part and a plurality of eighth protrusions arranged along the first direction, wherein the seventh connecting part is electrically connected to the plurality of eighth protrusions; The fifth protrusion and the sixth protrusion are arranged alternately and are spaced apart. The seventh protrusion and the eighth protrusion are arranged alternately and are spaced apart.

12. The photovoltaic module according to claim 11, characterized in that, The battery string located at the end of the first direction is the edge battery string, and the battery string located between the edge battery strings is the center battery string. The sixth connecting part in the center battery string further includes a third movable part, which can be folded along the first direction, and adjacent third movable parts are connected to each other.

13. The photovoltaic module according to claim 11, characterized in that, Along the second direction, the width of the sixth connecting portion is greater than that of the fifth connecting portion.

14. The photovoltaic module according to claim 11 or 13, characterized in that, The width of the fifth connecting part is 3mm to 5mm, and the width of the sixth connecting part is 14mm to 18mm.

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