Photovoltaic module

Abstract

This disclosure relates to the photovoltaic field and provides a photovoltaic module. The photovoltaic module includes a solar cell and a solder strip. The solar cell has multiple grid lines and solder portions electrically connected to the grid lines. The solder strip is located on the surface of the solder portion facing away from the solar cell and is electrically connected to the solder portion. The solder portion includes a first part and a second part located on both sides of the solder strip along a first direction, and a connecting part located between the first part and the second part. The connecting part is in electrical contact with the solder strip. The height of the surface of the first part facing away from the solar cell relative to the solar cell is greater than the height of the surface of the connecting part facing away from the solar cell relative to the solar cell. The height of the surface of the first part facing away from the solar cell relative to the solar cell is greater than the height of the surface of the second part facing away from the solar cell relative to the solar cell. In two adjacent solder portions connected to the same solder strip, the direction in which the first part of one solder portion points to the second part is opposite to the direction in which the first part of the other solder portion points to the second part. This disclosure embodiment can at least improve the performance of the photovoltaic module.

Description

Technical Field

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

[0002] As fossil fuels are gradually depleted, solar energy is becoming increasingly widely used as a new energy alternative. A solar cell is a device that converts sunlight into electrical energy. Solar cells 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 crucial devices for converting solar energy into electrical energy. In a photovoltaic module, solder ribbons are electrically connected to the grid lines on the solar cells via solder joints to collect the charge carriers generated by the cells. However, during transportation, external factors such as bumps can cause the solder ribbons to shift from the solder joints, affecting the module's performance. Utility Model Content

[0004] This disclosure provides a photovoltaic module that at least helps to improve the performance of the photovoltaic module.

[0005] According to some embodiments of this disclosure, one aspect of this disclosure provides a photovoltaic module, the photovoltaic module comprising: a solar cell, the solar cell having a plurality of grid lines and a welding portion electrically connected to the grid lines; and a solder strip, the solder strip being located on the surface of the welding portion away from the solar cell and electrically connected to the welding portion; wherein, the welding portion includes a first portion and a second portion located on both sides of the solder strip along a first direction and a connecting portion located between the first portion and the second portion, the connecting portion being in electrical contact with the solder strip, the height of the surface of the first portion away from the solar cell relative to the solar cell being greater than the height of the surface of the connecting portion away from the solar cell relative to the solar cell, the height of the surface of the first portion away from the solar cell relative to the solar cell being greater than the height of the surface of the second portion away from the solar cell relative to the solar cell, and in two adjacent welding portions connected to the same solder strip, the direction in which the first portion of one welding portion points to the second portion is opposite to the direction in which the first portion of the other welding portion points to the second portion.

[0006] In some embodiments, the surface of the welded portion facing away from the battery cell is a slope.

[0007] In some embodiments, the surface of the first part facing away from the battery cell is a plane perpendicular to the thickness direction of the battery cell, the surface of the second part facing away from the battery cell is a plane perpendicular to the thickness direction of the battery cell, and the surface of the connecting part facing away from the battery cell is a plane perpendicular to the thickness direction of the battery cell.

[0008] In some embodiments, the surface of the first part facing away from the battery cell is a slope, the surface of the second part facing away from the battery cell is a slope, and the surface of the connecting part facing away from the battery cell is a plane perpendicular to the thickness direction of the battery cell.

[0009] In some embodiments, the height of the end of the first part facing the second part relative to the battery cell is a first height, the height of the end of the second part facing the first part relative to the battery cell is a second height, and the height of the connecting part relative to the battery cell is a third height, wherein the first height is greater than the third height, and the second height is greater than the third height.

[0010] In some embodiments, the length of the connecting portion along the first direction is greater than or equal to the width of the solder strip along the first direction.

[0011] In some embodiments, the length of the connecting portion along the first direction is 0.1 mm to 1 mm, and the width of the welding strip along the first direction is 0.1 mm to 0.8 mm.

[0012] In some embodiments, the side of the first part facing the second part is a first arc surface, the surface of the connecting part away from the battery cell is a second arc surface, the side of the second part facing the first part is a third arc surface, and the first arc surface, the second arc surface and the third arc surface are smoothly connected.

[0013] In some embodiments, the height of the surface of the first part facing away from the battery cell relative to the battery cell is 0.1 mm to 0.35 mm, the height of the surface of the second part facing away from the battery cell relative to the battery cell is 0.05 mm to 0.1 mm, and the height of the surface of the connecting part facing away from the battery cell relative to the battery cell is 0.05 mm to 0.1 mm.

[0014] In some embodiments, in the direction from the second part to the first part, the width of the welded part gradually decreases along the second direction.

[0015] The technical solutions provided in this disclosure have at least the following advantages:

[0016] In the photovoltaic module provided in this embodiment, the height of the surface of the first part facing away from the solar cell relative to the solar cell is greater than the height of the surface of the second part facing away from the solar cell relative to the solar cell. The height of the surface of the first part facing away from the solar cell relative to the solar cell is also greater than the height of the surface of the connecting part facing away from the solar cell relative to the solar cell. In two adjacent welding parts connected to the same solder strip, the direction in which the first part of one welding part points towards the second part is opposite to the direction in which the first part of the other welding part points towards the second part. That is, the first part is higher, and in two adjacent welding parts connected to the same solder strip, the first part of one welding part is located on one side of the solder strip, and the first part of the other welding part is located on the other side of the solder strip. This allows the solder strip to be blocked on both sides in the first direction by the higher first part, preventing the solder strip from moving in the first direction under external force and deviating from the welding part, thereby improving the performance of the photovoltaic module. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a schematic diagram of a photovoltaic module provided in an embodiment of the present disclosure;

[0019] Figure 2 for Figure 1 A partially enlarged schematic diagram of the welded section and the weld strip;

[0020] Figure 3 A partial cross-sectional view of a photovoltaic module provided in an embodiment of this disclosure;

[0021] Figure 4 This is a schematic diagram of a first structure of the welding part in a photovoltaic module provided in an embodiment of this disclosure;

[0022] Figure 5 This is a schematic diagram of a second structure of the welding part in a photovoltaic module provided in an embodiment of this disclosure;

[0023] Figure 6 This is a schematic diagram of a third structure of the welding part in a photovoltaic module provided in an embodiment of this disclosure;

[0024] Figure 7 This is a schematic diagram of a fourth structure of the welding part in a photovoltaic module provided in an embodiment of this disclosure;

[0025] Figure 8 This is a schematic diagram of a fifth structure of the welding part in a photovoltaic module provided in an embodiment of this disclosure;

[0026] Figure 9 Another partial cross-sectional view of a photovoltaic module provided in an embodiment of this disclosure. Detailed Implementation

[0027] As is known from the background technology, during transportation, the welding strip may be subjected to external forces due to bumps and other external factors, causing it to move left and right in the first direction and deviate from the welding part, thus affecting the performance of the photovoltaic module.

[0028] This disclosure provides a photovoltaic module in which the first part of the welding portion is relatively high, and in two adjacent welding portions connected to the same welding strip, the first part of one welding portion is located on one side of the welding strip, and the first part of the other welding portion is located on the other side of the welding strip. This allows the welding strip to be blocked by the higher first part on both sides in the first direction, preventing the welding strip from deviating from the welding portion after moving in the first direction under the action of external force, thereby improving the performance of the photovoltaic module.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] In the description of the embodiments of this disclosure, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces).

[0033] 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.

[0034] 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.

[0035] In the accompanying drawings corresponding to the embodiments of this disclosure, the thickness and area of ​​the layers are enlarged for better understanding and ease of description. When describing a component (such as a layer, film, region, or substrate) on or on the surface of another component, the component may be "directly" located on the surface of the other component, or there may be a third component between the two components. Conversely, when describing a component on the surface of another component, or when another component is formed or disposed on the surface of a component, it indicates that there is no third component between the two components. Furthermore, when describing a component as being "generally" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a portion of the edge of the entire surface.

[0036] 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.

[0037] 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.

[0038] Figure 1 This is a schematic diagram of a photovoltaic module provided in an embodiment of the present disclosure. Figure 2 for Figure 1 A partially enlarged schematic diagram of the welded section and the weld strip. Figure 3 This is a partial cross-sectional view of a photovoltaic module provided in an embodiment of this disclosure. Figure 4 This is a schematic diagram of a first structure of the welding part in a photovoltaic module provided in an embodiment of this disclosure.

[0039] refer to Figures 1 to 4 The photovoltaic module includes: a solar cell 11, on which multiple grid lines 12 are disposed and a welding portion 13 electrically connected to the grid lines 12. The photovoltaic module also includes a solder ribbon 14, which is located on the surface of the welding portion 13 away from the solar cell 11 and electrically connected to the welding portion 13. The welding portion 13 includes a first portion 131 and a second portion 132 located on both sides of the welding strip 14 along the first direction X, and a connecting portion 133 located between the first portion 131 and the second portion 132. The height of the surface of the first portion 131 away from the battery cell 11 relative to the battery cell 11 is greater than the height of the surface of the connecting portion 133 away from the battery cell 11 relative to the battery cell 11. The height of the surface of the first portion 131 away from the battery cell 11 relative to the battery cell 11 is greater than the height of the surface of the second portion 132 away from the battery cell 11 relative to the battery cell 11. In two adjacent welding portions 13 connected to the same welding strip 14, the direction in which the first portion 131 of one welding portion 13 points to the second portion 132 is opposite to the direction in which the first portion 131 of the other welding portion 13 points to the second portion 132.

[0040] Photovoltaic modules are used to convert solar energy into electrical energy.

[0041] The solar cell 11 can be one or any combination of TOPCON (Tunnel Oxide Passivated Contact), IBC (Interdigitated Back Contact), HIT / HJT (Heterojunction Technology), PERC (Passivated Emitter Rear Cell), 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.

[0042] The solar cell 11 can be a main grid cell, which can shorten the current conduction path and reduce internal losses, thereby increasing the power of the photovoltaic module. The solar cell 11 can also be a gridless cell, in which case the solder ribbon 14 is used to replace the original main grid and is directly connected to the fine grid, which can significantly reduce the silver paste consumption and thus reduce the cost of the photovoltaic module.

[0043] The battery cell 11 includes a first surface 111 and a second surface 112 facing each other. In some embodiments, the battery cell 11 is a single-sided battery, in which case the first surface 111 can serve as a light-receiving surface for receiving incident light, and the second surface 112 serves as a backlight surface. In some embodiments, the battery cell 11 is a double-sided battery, in which case both the first surface 111 and the second surface 112 can serve as light-receiving surfaces and can both be used to receive incident light.

[0044] In some embodiments, grid lines 12 may be provided on both the first surface 111 and the second surface 112 of the battery cell 11. In other embodiments, the grid lines 12 of the battery cell 11 may be provided on only one of the first surface 111 and the second surface 112, while the other surface 111 and the second surface 112 may not have grid lines 12.

[0045] The thickness direction of the battery cell 11 refers to the direction parallel to the direction from the first surface 111 to the second surface 112.

[0046] Understandable Figure 3 Taking cell 11 as an example of a TOPCON battery, and Figure 3 Only the grid lines 12 on the first surface 111 are shown; the grid lines 12 on the second surface 112 are not shown.

[0047] The grid line 12 is located on the solar cell 11 and is used to collect the charge carriers generated by the solar cell 11 and transfer them to the solder strip 14.

[0048] In some embodiments, the solar cell 11 is a gridless solar cell, and the grid lines 12 are fine grids. The fine grids are used to make electrical contact with the doped conductive layer on the solar cell 11, collecting and transporting charge carriers. Figure 1 Taking cell 11 as an example, which is a gridless cell.

[0049] In other embodiments, the cell 11 is a grid cell, and the grid lines 12 may include main grids and fine grids. The fine grids are cross-connected to the main grids. The fine grids transfer the collected charge carriers to the main grids. The main grids are in electrical contact with the solder ribbon 14, transferring the charge carriers collected from the fine grids to the solder ribbon 14.

[0050] The welding part 13 is in electrical contact with the grid line 12, and is used to electrically connect the welding strip 14 and the grid line 12.

[0051] In some embodiments, the length of the weld portion 13 along the first direction X is 1.2 mm to 5 mm, for example, 1.2 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm. The width of the weld portion 13 along the second direction Y is 0.5 mm to 3 mm, for example, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, or 3 mm. The length and width of the weld portion 13 being within the above ranges ensures sufficient contact area between the weld portion 13 and the weld strip 14.

[0052] The first part 131 and the second part 132 are located on opposite sides of the welding strip 14, and the connecting part 133 is located between the first part 131 and the second part 132 and is in electrical contact with the welding strip 14.

[0053] refer to Figure 3 and Figure 4 In some embodiments, the surface of the first part 131 facing away from the battery cell 11 is a plane perpendicular to the thickness direction of the battery cell 11; the surface of the second part 132 facing away from the battery cell 11 is a plane perpendicular to the thickness direction of the battery cell 11; and the surface of the connecting part 133 facing away from the battery cell 11 is a plane perpendicular to the thickness direction of the battery cell 11. That is, the surfaces of the first part 131, the second part 132, and the connecting part 133 facing away from the battery cell 11 can all be parallel to the first surface 111. In this way, the welding part 13 is stepped, and the surface of the connecting part 133 facing away from the battery cell 11 is a plane parallel to the first surface 111 of the battery cell 11. When the surface of the solder ribbon 14 facing the battery cell 11 is also a plane (for example, the cross-section of the solder ribbon 14 is rectangular), the reliability of the contact between the solder ribbon 14 and the connecting part 133 can be improved.

[0054] In some embodiments, the side of the first part 131 facing the second part 132 is a plane parallel to the thickness direction of the battery cell 11. In this way, the side of the first part 131 that blocks the movement of the solder ribbon 14 can be perpendicular to the surface of the connecting part 133 that is away from the battery cell 11, which can provide a better blocking effect.

[0055] In some embodiments, the height of the surface of the first part 131 facing away from the battery cell 11 relative to the battery cell 11 is 0.1 mm to 0.35 mm, for example, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, or 0.35 mm. The height of the surface of the second part 132 facing away from the battery cell 11 relative to the battery cell 11 is 0.05 mm to 0.1 mm, for example, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, or 0.1 mm. The height of the surface of the connecting part 133 facing away from the battery cell 11 relative to the battery cell 11 is 0.05 mm to 0.1 mm, for example, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, or 0.1 mm.

[0056] Figure 5 This is a schematic diagram of a second structure of the welding part in a photovoltaic module provided in an embodiment of this disclosure.

[0057] refer to Figure 3 and Figure 5 In some embodiments, the surface of the welded portion 13 facing away from the battery cell 11 is a sloped surface. That is, the surface of the welded portion 13 facing away from the battery cell 11 is inclined relative to the first surface 11.

[0058] Figure 6 This is a schematic diagram of a third structure of the welding part in a photovoltaic module provided in an embodiment of this disclosure.

[0059] refer to Figure 3 and Figure 6In some embodiments, the surface of the first part 131 facing away from the battery cell 11 is a sloped surface, the surface of the second part 132 facing away from the battery cell 11 is a sloped surface, and the surface of the connecting part 133 facing away from the battery cell 11 is a plane perpendicular to the thickness direction of the battery cell 11. The surface of the first part 131 facing away from the battery cell 11 being a sloped surface means that the surface of the first part 131 facing away from the battery cell 11 is inclined relative to the first surface 111. The surface of the second part 132 facing away from the battery cell 11 being a sloped surface means that the surface of the second part 132 facing away from the battery cell 11 is inclined relative to the first surface 111. Having both the first and second parts facing away from the battery cell 11 having sloped surfaces helps to save on the manufacturing costs of the first part 131 and the second part 132. The surface of the connecting portion 133 facing away from the battery cell 11 is a plane parallel to the first surface 111. When the surface of the solder ribbon 14 facing the battery cell 11 is also a plane (for example, the cross-section of the solder ribbon 14 is rectangular), the reliability of the contact between the solder ribbon 14 and the connecting portion 133 can be improved.

[0060] Figure 7 This is a schematic diagram of a fourth structure of the welding part in a photovoltaic module provided in an embodiment of this disclosure.

[0061] refer to Figure 3 and Figure 7 In some embodiments, the height of the end of the first part 131 facing the second part 132 relative to the solar cell 11 is a first height H1, the height of the end of the second part 132 facing the first part 131 relative to the solar cell 11 is a second height H2, and the height of the connecting part 133 relative to the solar cell 11 is a third height H3. The first height H1 is greater than the third height H3, and the second height H2 is greater than the third height H3. In this way, both the first part 131 and the second part 132 located on opposite sides of the solder ribbon 14 can provide resistance to the movement of the solder ribbon 14, which can prevent the solder ribbon 14 from deviating from the welding part 13, and is beneficial to improving the performance of the photovoltaic module.

[0062] In some embodiments, the length of the connecting portion 133 along the first direction X is greater than or equal to the width of the solder strip 14 along the first direction X. The length of the connecting portion 133 along the first direction X is greater than or equal to the width of the solder strip 14 along the first direction X, so that the solder strip 14 can be placed between the first portion 131 and the second portion 132.

[0063] When the length of the connecting part 133 along the first direction X is equal to the width of the solder strip 14 along the first direction X, that is, the distance between the first part 131 and the second part 132 along the first direction X is equal to the width of the solder strip 14 along the first direction X, the solder strip 14 can be directly snapped between the first part 131 and the second part 132, which can prevent the solder strip 14 from deviating from the welding part 13, thereby improving the performance of the photovoltaic module.

[0064] In some embodiments, the length of the connecting portion 133 along the first direction X is greater than the width of the solder strip 14 along the first direction X. The photovoltaic module may also include a flux portion (not shown), which is located between the first portion 131 and the solder strip 14, and also between the second portion 132 and the solder strip 14. The flux portion can fill the space between the first portion 131 and the solder strip 14, and between the second portion 132 and the solder strip 14, so as to facilitate the engagement and fixation of the first portion 131 and the second portion 132 with the solder strip 14, thereby preventing the solder strip 14 from being moved by external forces under external factors and deviating from the welding portion 13.

[0065] The flux section is used to assist in welding the solder strip 14 to the welding section 13. The flux section may also be located between the solder strip 14 and the connecting section 133.

[0066] The flux can be solder paste.

[0067] In some embodiments, the length of the connecting portion 133 along the first direction X is 0.1mm to 1mm, for example, 0.1mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm or 1mm. The width of the solder strip 14 along the first direction X is 0.1mm to 0.8mm, for example, 0.1mm, 0.3mm, 0.5mm, 0.7mm or 0.8mm.

[0068] Figure 8 This is a schematic diagram of the fifth structure of the welding part 13 in the photovoltaic module provided in this embodiment of the present disclosure.

[0069] refer to Figure 8 In some embodiments, the side of the first part 131 facing the second part 132 is a first arc surface, the surface of the connecting part 133 away from the battery cell 11 is a second arc surface, and the side of the second part 132 facing the first part 131 is a third arc surface, and the first arc surface, the second arc surface and the third arc surface are smoothly connected.

[0070] The smooth connection of the first, second, and third arc surfaces means that these three arc surfaces are located on the same radius circle.

[0071] The arc surface formed by connecting the first, second, and third arc surfaces is a concave arc surface that is recessed into the battery cell 11.

[0072] When the solder strip 14 is a round solder strip 14, the smoothly connected first arc surface, second arc surface and third arc surface can better fit and abut against the round solder strip 14, which is beneficial to improve the constraint force of the first part 131 and the second part 132 on the movement of the solder strip 14 in the first direction X, and is beneficial to improve the structural stability of the photovoltaic module.

[0073] In some embodiments, in the direction from the second part 132 to the first part 131, the width of the welding part 13 gradually decreases along the second direction Y. This gradual reduction in the width of the welding part 13 along the second direction Y can save material in the welding part 13, thereby reducing the manufacturing cost of the photovoltaic module.

[0074] It is understandable that in the actual production process, the width of the welded part 13 along the second direction Y is affected by the manufacturing precision. In the direction from the second part 132 to the first part 131, the width of the welded part 13 along the second direction Y is not strictly decreasing, but rather shows a decreasing trend. For example, the width may suddenly increase at some positions on the decreasing path, and then continue to decrease.

[0075] In some embodiments, the width of the end of the first part 131 facing away from the second part 132 along the second direction Y is 0 to 2.5 mm, for example, 0 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, or 2.5 mm. The width of the end of the second part 132 facing away from the first part 131 along the second direction Y is 0.5 mm to 3 mm, for example, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, or 3 mm.

[0076] When the width of the end of the first part 131 away from the second part 132 along the second direction Y is 0mm, the orthographic projection of the welding part 13 on the battery cell 11 is a triangle.

[0077] In other embodiments, the width of the welding portion 13 along the second direction Y can remain unchanged in the direction from the second portion 132 to the first portion 131. In this case, the shape of the orthographic projection of the welding portion onto the battery cell is rectangular.

[0078] Continue to refer to Figure 1 and Figure 3 The solder strip 14 is used to electrically connect two adjacent battery cells 11 to form a battery string.

[0079] In some embodiments, the thickness of the solder strip 14 is 0.1 mm to 0.4 mm, for example 0.1 mm, 0.2 mm, 0.3 mm or 0.4 mm.

[0080] The width of the solder strip 14 along the first direction X is 0.1mm to 0.8mm, for example, 0.1mm, 0.3mm, 0.5mm, 0.7mm or 0.8mm.

[0081] Continue to refer to Figure 1 and Figure 7In some embodiments, the difference between the first height H1 and the third height H3 is denoted as the first difference, and the difference between the second height H2 and the third height H3 is denoted as the second difference. The ratio of the first difference to the thickness of the solder strip 14 is 0.3 to 1, for example, 0.3, 0.5, 0.8, or 1. The first difference is positively correlated with the contact area between the first part 131 and the solder strip 14, that is, the first difference is positively correlated with the blocking effect provided by the first part 131 for the movement of the solder strip 14. When the ratio of the first difference to the thickness of the solder strip 14 is within the above range, the first part 131 can effectively block the movement of the solder strip 14.

[0082] The ratio of the second difference to the thickness of the solder strip 14 is 0.3 to 1, for example, 0.3, 0.5, 0.8, or 1. The second difference is positively correlated with the contact area between the second part 132 and the solder strip 14, that is, the second difference is positively correlated with the blocking effect provided by the second part 132 for the movement of the solder strip 14. When the ratio of the second difference to the thickness of the solder strip 14 is within the above range, the second part 132 can effectively block the movement of the solder strip 14.

[0083] Understandable Figure 3 The illustration shows a square cross-section of the welding strip. In reality, the cross-section of the welding strip can also be circular, triangular, trapezoidal, pentagonal, or other shapes.

[0084] Figure 9 Another partial cross-sectional view of a photovoltaic module provided in an embodiment of this disclosure.

[0085] refer to Figure 9 In some embodiments, the photovoltaic module further includes an encapsulating film 15 and a cover plate 16, wherein the encapsulating film 15 is used to cover the surface of the solar cell 11; and the cover plate 16 is used to cover the surface of the encapsulating film 15 facing away from the solar cell 11.

[0086] In some embodiments, the encapsulating film 15 includes a first encapsulating layer and a second encapsulating layer. The first encapsulating layer covers one of the first surface 111 and the second surface 112 of the battery cell 11, and the second encapsulating layer covers the other of the first surface 111 and the second surface 112 of the battery cell 11. Specifically, at least one of the first encapsulating layer or the second encapsulating layer can be an organic encapsulating film such as polyvinyl butyral (PVB) film, ethylene-vinyl acetate copolymer (EVA) film, polyvinyl octene coelastomer (POE) film, or polyethylene terephthalate (PET) film. Alternatively, at least one of the first encapsulating layer or the second encapsulating layer can also be an EP film, an EPE film, or a PVP film.

[0087] Among them, EP film refers to a co-extruded film composed of stacked EVA film and POE film; EPE film refers to a co-extruded film formed by sequentially stacking EVA film, POE film, and EVA film; and PVP film refers to a co-extruded film formed by stacking POE film, EVA film, and POE film. Co-extruded films can be manufactured 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.

[0088] In some cases, the first encapsulation layer and the second encapsulation layer still have a boundary line before lamination. After lamination, the photovoltaic module no longer has 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.

[0089] In some embodiments, the cover plate 16 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 facing the encapsulating film can be an uneven surface or a textured surface containing multiple raised structures, thereby increasing the utilization rate of incident light. The cover plate 16 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.

[0090] 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 this disclosure. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of this disclosure; therefore, the scope of protection of this disclosure should be determined by the scope defined in the claims.

Claims

1. A photovoltaic module, characterized by, include: A battery cell, wherein the battery cell is provided with multiple grid lines and a welding portion electrically connected to the grid lines; A welding strip, which is located on the surface of the welding portion away from the battery cell and is electrically connected to the welding portion; The welding portion includes a first portion and a second portion located on both sides of the welding strip along a first direction, and a connecting portion located between the first portion and the second portion. The connecting portion is in electrical contact with the welding strip. The height of the surface of the first portion away from the battery cell relative to the battery cell is greater than the height of the surface of the connecting portion away from the battery cell relative to the battery cell. The height of the surface of the first portion away from the battery cell relative to the battery cell is greater than the height of the surface of the second portion away from the battery cell relative to the battery cell. In two adjacent welding portions connected to the same welding strip, the direction in which the first portion of one welding portion points to the second portion is opposite to the direction in which the first portion of the other welding portion points to the second portion.

2. The photovoltaic module of claim 1, wherein, The surface of the welded part that faces away from the battery cell is a slope.

3. The photovoltaic module of claim 1, wherein, The surface of the first part facing away from the battery cell is a plane perpendicular to the thickness direction of the battery cell; the surface of the second part facing away from the battery cell is a plane perpendicular to the thickness direction of the battery cell; and the surface of the connecting part facing away from the battery cell is a plane perpendicular to the thickness direction of the battery cell.

4. The photovoltaic module of claim 1, wherein, The surface of the first part facing away from the battery cell is a slope, the surface of the second part facing away from the battery cell is a slope, and the surface of the connecting part facing away from the battery cell is a plane perpendicular to the thickness direction of the battery cell.

5. The photovoltaic module of claim 4, wherein, The height of the end of the first part facing the second part relative to the battery cell is a first height, the height of the end of the second part facing the first part relative to the battery cell is a second height, and the height of the connecting part relative to the battery cell is a third height. The first height is greater than the third height, and the second height is greater than the third height.

6. The photovoltaic module of claim 4, wherein, The length of the connecting portion along the first direction is greater than or equal to the width of the welding strip along the first direction.

7. The photovoltaic module of claim 4, wherein, The length of the connecting portion along the first direction is 0.1mm to 1mm, and the width of the welding strip along the first direction is 0.1mm to 0.8mm.

8. The photovoltaic module of claim 4, wherein, The side of the first part facing the second part is a first arc surface, the surface of the connecting part away from the battery cell is a second arc surface, and the side of the second part facing the first part is a third arc surface, and the first arc surface, the second arc surface and the third arc surface are smoothly connected.

9. The photovoltaic module of claim 1, wherein, The height of the surface of the first part facing away from the battery cell relative to the battery cell is 0.1mm to 0.35mm, the height of the surface of the second part facing away from the battery cell relative to the battery cell is 0.05mm to 0.1mm, and the height of the surface of the connecting part facing away from the battery cell relative to the battery cell is 0.05mm to 0.1mm.

10. The photovoltaic module of claim 1, wherein, In the direction from the second part to the first part, the width of the welded part gradually decreases along the second direction.

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