Method for manufacturing a photovoltaic module, photovoltaic module

Abstract

The embodiment of the present disclosure relates to the photovoltaic field, and provides a preparation method of a photovoltaic module, and the photovoltaic module. The preparation method comprises the following steps: providing a cell piece; forming insulating glue on the cell piece by using a screen; the step of providing the screen to form the insulating glue comprises the following steps: providing a first screen to form first insulating glue on the cell piece, gradually decreasing the thickness of the first screen in a second direction first and then gradually increasing the thickness of the first screen in the second direction along a first direction, or gradually increasing the thickness of the first screen in the second direction first and then gradually decreasing the thickness of the first screen in the second direction, so that the thickness of the first insulating glue in the second direction is gradually increased first and then gradually decreased; and / or providing a second screen to form second insulating glue on the cell piece, gradually decreasing the thickness of the first screen in the second direction along the first direction, or gradually increasing the thickness of the first screen in the second direction, so that the thickness of the second insulating glue in the second direction is gradually increased. The embodiment of the present disclosure is at least beneficial to forming insulating glue with a gradually changing thickness by means of a screen.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure relate to the field of photovoltaics, and in particular to a method for manufacturing a photovoltaic module and a photovoltaic module. BACKGROUND

[0002] At present, with the gradual depletion of fossil energy, photovoltaic cells are used more and more widely as a new energy alternative. Photovoltaic cells are devices that convert solar light energy into electrical energy. Photovoltaic cells use the photovoltaic principle to generate carriers, and then use electrodes to lead out the carriers, thereby facilitating the effective use of electrical energy. The grid lines of the photovoltaic cells play an important role in collecting and transmitting electrons. When a photovoltaic module is assembled using multiple photovoltaic cells, a solder strip is often used to connect the grid lines of adjacent cells.

[0003] In the current back contact photovoltaic module, the solder strip and / or the main grid and the auxiliary grid are arranged in different directions, so the solder strip and / or the main grid will cross the auxiliary grid of different polarity while connecting the auxiliary grid of the same polarity. In order to prevent the solder strip and / or the main grid from connecting the auxiliary grid of different polarity and causing a short circuit, an insulating block needs to be arranged between the solder strip and / or the main grid and the auxiliary grid of different polarity.

[0004] However, the thickness of the insulating block not only affects the height difference between at least part of the area of the solder strip and the cell, but also affects the insulation effect of the insulating block itself, so a more preferred insulating block or a method for manufacturing the insulating block is needed. SUMMARY

[0005] Embodiments of the present disclosure provide a method for manufacturing a photovoltaic module and a photovoltaic module, which at least facilitates the formation of an insulating glue with a gradually changing thickness by means of a screen.

[0006] According to some embodiments of the present disclosure, the present disclosure provides a method for manufacturing a photovoltaic module. The method comprises: providing a cell; providing a screen to form an insulating glue on the cell; the step of providing the screen to form the insulating glue comprises: providing a first screen to form a first insulating glue on the cell, wherein, along a first direction, a thickness of the first screen in a second direction gradually decreases first and then gradually increases, and a side of the first screen facing the cell is concave away from the cell; or, along the first direction, the thickness of the first screen in the second direction gradually increases first and then gradually decreases, and a side of the first screen away from the cell is convex away from the cell; the thickness of the first insulating glue in the second direction gradually increases first and then gradually decreases; and / or, providing a second screen to form a second insulating glue on the cell, wherein, along the first direction, the thickness of the second screen in the second direction gradually decreases, and a side of the second screen facing the cell is concave away from the cell; or, along the first direction, the thickness of the second screen in the second direction gradually increases, and a side of the second screen away from the cell is convex away from the cell; the thickness of the second insulating glue in the second direction gradually increases; the first direction is a length direction of the insulating glue, and the second direction is a thickness direction of the cell.

[0007] In some embodiments, along the first direction, a length of the screen is less than a length of the insulating glue.

[0008] In some embodiments, along the first direction, a thickness of a thinnest part of the screen is 12-18 μm, and a thickness of a thickest part of the screen is 105-115 μm.

[0009] In some embodiments, a reference cross section is a plane perpendicular to the first direction; in the provided first screen, along the first direction, a cross-sectional area of the first screen on the reference cross section gradually decreases first and then gradually increases, and a side of the first screen facing the cell is a curved surface or two intersecting inclined surfaces, and a side of the first screen away from the cell is a plane; and / or, in the provided second screen, along the first direction, a cross-sectional area of the second screen on the reference cross section gradually decreases, and a side of the second screen facing the cell is a curved surface or an inclined surface, and a side of the second screen away from the cell is a plane.

[0010] In some embodiments, a reference cross section is provided, which is a plane perpendicular to the first direction; in the provided first screen, along the first direction, the cross-sectional area of the first screen on the reference cross section first gradually increases and then gradually decreases, and the side of the first screen away from the battery piece is two intersecting inclined planes or two intersecting curved surfaces, and the side of the first screen towards the battery piece is a plane; and / or, in the provided second screen, along the first direction, the cross-sectional area of the second screen on the reference cross section gradually increases, and the side of the second screen away from the battery piece is an inclined plane or a curved surface, and the side of the second screen towards the battery piece is a plane.

[0011] In some embodiments, a reference cross section is provided, which is a plane perpendicular to the first direction; in the provided first screen, along the first direction, the cross-sectional area of the first screen on the reference cross section first gradually decreases and then gradually increases, the side of the first screen towards the battery piece is recessed away from the battery piece, and the side of the first screen away from the battery piece is recessed towards the battery piece; and / or, in the provided second screen, along the first direction, the cross-sectional area of the second screen on the reference cross section gradually decreases, the side of the second screen towards the battery piece is recessed away from the battery piece, and the side of the second screen away from the battery piece is recessed towards the battery piece.

[0012] In some embodiments, the step of providing the battery piece includes providing a back contact battery piece provided with first fine grids and second fine grids arranged alternately on the back surface of the battery piece; the step of providing the first screen to form the first insulating glue on the battery piece includes forming a plurality of the first insulating glue arranged along the first direction, the first insulating glue covering the first fine grid or the second fine grid; after the step of providing the first screen to form the first insulating glue on the battery piece, the preparation method further includes: forming a plurality of solder strips arranged at intervals along the first direction, in the same solder strip, the solder strip is electrically connected to one of the first fine grid and the second fine grid, the solder strip is electrically insulated from the other one of the first fine grid and the second fine grid, and the solder strip is located between adjacent two first insulating glues or abuts against at least one of the adjacent two first insulating glues.

[0013] In some embodiments, the step of providing the cell piece includes providing a back contact cell piece having a back surface provided with first fine grids and second fine grids arranged alternately; the step of providing the first screen to form the first insulating glue on the cell piece includes forming a plurality of the first insulating glue arranged at intervals along the first direction, the first insulating glue covering the first fine grid or the second fine grid; after the step of providing the first screen to form the first insulating glue on the cell piece, the preparation method further includes forming a plurality of solder strips arranged at intervals along the first direction, in the same solder strip, the solder strip is electrically connected with one of the first fine grid and the second fine grid, the solder strip is electrically insulated from the other one of the first fine grid and the second fine grid, and the solder strip is centrally arranged on the first insulating glue.

[0014] In some embodiments, the step of providing the cell piece includes that, along the first direction, at least one of opposite sides of the cell piece in the second direction has a first edge region and a second edge region opposite to each other; the step of providing the second screen to form the second insulating glue on the cell piece includes forming at least two second insulating glues arranged at intervals along a third direction on the first edge region and the second edge region, the third direction being a width direction of the second insulating glue; after the step of providing the first screen to form the first insulating glue on the cell piece, the preparation method further includes forming a plurality of solder strips arranged at intervals along the third direction, in the same solder strip, the solder strip is in abutment with one of the second insulating glues located on the first edge region and in abutment with one of the second insulating glues located on the second edge region.

[0015] According to some embodiments of the present disclosure, another aspect of the present disclosure further provides a photovoltaic module, including: a photovoltaic module formed via the preparation method of the photovoltaic module according to any one of the above.

[0016] The technical solutions provided by the embodiments of the present disclosure have at least the following advantages:

[0017] A new type of screen is provided, by means of which a thickness of the insulating glue can be gradually changed according to preset requirements. For example, a first insulating glue with a thickness gradually increasing and then gradually decreasing in a second direction can be formed by using a first screen, and / or a second insulating glue with a thickness gradually increasing in the second direction can be formed by using a second screen. Whether the thickness of the insulating glue in the second direction is gradually changed as in the first insulating glue or as in the second insulating glue, it is beneficial to match the subsequently formed solder strip by using the thinning feature of the thickness of the insulating glue at at least one edge in the second direction, so as to reduce the height difference between at least a partial area of the solder strip and the battery piece, to reduce the bending degree of the solder strip itself, to reduce the stress caused by the solder strip to the battery piece, and to reduce the risk of the battery piece breaking. In addition, the reduction of the bending degree of the solder strip itself can also improve the service life of the solder strip to some extent. Moreover, the amount of insulating glue required for preparation can be reduced by means of the screen, thereby facilitating the reduction of the preparation cost of the photovoltaic module. BRIEF DESCRIPTION OF DRAWINGS

[0018] One or more embodiments are illustrated by way of example in the figures that form a part of this disclosure and which are shown by way of illustration in the drawings. Together with the description, the drawings explain the principles of the disclosure. In the drawings:

[0019] Figure 1 A partial top view of a photovoltaic module preparation method provided by an embodiment of the disclosure;

[0020] Figure 2 A first partial cross-sectional view of a screen corresponding to an insulating glue in a photovoltaic module preparation method provided by an embodiment of the disclosure;

[0021] Figure 3 A first partial cross-sectional view of a screen corresponding to an insulating glue in a photovoltaic module preparation method provided by an embodiment of the disclosure;

[0022] Figure 4 A third partial cross-sectional view of a screen corresponding to an insulating glue in a photovoltaic module preparation method provided by an embodiment of the disclosure;

[0023] Figure 5 A fourth partial cross-sectional view of a screen corresponding to an insulating glue in a photovoltaic module preparation method provided by an embodiment of the disclosure;

[0024] Figure 6A fifth partial cross-sectional view of the screen corresponding to the insulating adhesive in the method for manufacturing a photovoltaic module according to an embodiment of the present disclosure is provided;

[0025] Figure 7 A sixth partial cross-sectional view of the screen corresponding to the insulating adhesive in the method for manufacturing a photovoltaic module according to an embodiment of the present disclosure is provided;

[0026] Figure 8 A seventh partial cross-sectional view of the screen corresponding to the insulating adhesive in the method for manufacturing a photovoltaic module according to an embodiment of the present disclosure is provided;

[0027] Figure 9 An eighth partial cross-sectional view of the screen corresponding to the insulating adhesive in the method for manufacturing a photovoltaic module according to an embodiment of the present disclosure is provided;

[0028] Figure 10 A ninth partial cross-sectional view of the screen corresponding to the insulating adhesive in the method for manufacturing a photovoltaic module according to an embodiment of the present disclosure is provided;

[0029] Figure 11 A tenth partial cross-sectional view of the screen corresponding to the insulating adhesive in the method for manufacturing a photovoltaic module according to an embodiment of the present disclosure is provided;

[0030] Figure 12 A partial top view of the insulating adhesive formed on the cell in the method for manufacturing a photovoltaic module according to an embodiment of the present disclosure is provided;

[0031] Figure 13 A partial cross-sectional view of the insulating adhesive formed on the cell in the method for manufacturing a photovoltaic module according to an embodiment of the present disclosure is provided;

[0032] Figure 14 Another partial top view of the insulating adhesive formed on the cell in the method for manufacturing a photovoltaic module according to an embodiment of the present disclosure is provided;

[0033] Figure 15 Another partial cross-sectional view of the insulating adhesive formed on the cell in the method for manufacturing a photovoltaic module according to an embodiment of the present disclosure is provided;

[0034] Figure 16 Still another partial cross-sectional view of the insulating adhesive formed on the cell in the method for manufacturing a photovoltaic module according to an embodiment of the present disclosure is provided;

[0035] Figure 17 A partial three-dimensional structure view of the photovoltaic module according to another embodiment of the present disclosure is provided;

[0036] Figure 18 A partial three-dimensional structure view of the photovoltaic module according to another embodiment of the present disclosure is provided; Figure 17 A partial cross-sectional structure view along the first cross-sectional direction AA1 is provided. DETAILED DESCRIPTION

[0037] From the background art, there is a need for a more preferred insulation block or a method for preparing an insulation block.

[0038] It is found through analysis that, if the thickness of the insulation block itself is too large, the height difference between at least part of the solder ribbon and the cell sheet is likely to be too large, thereby causing a large degree of bending of the solder ribbon, resulting in local stress concentration on the cell sheet, and the cell sheet is likely to be broken; if the thickness of the insulation block itself is too small, the insulation effect of the insulation block itself is likely to be affected, and the solder ribbon is likely to cause a short circuit problem due to connecting different polarity sub-ridges.

[0039] The present disclosure provides a method for preparing a photovoltaic module and a photovoltaic module. In the method, a new type of screen is provided, and the thickness of the insulation glue formed by means of the type of screen can be gradually changed according to the preset requirements. For example, a first insulation glue with a thickness gradually increasing and then gradually decreasing in the second direction can be formed by using a first screen, and / or a second insulation glue with a thickness gradually increasing in the second direction can be formed by using a second screen. Whether the thickness of the insulation glue in the second direction is gradually changed like the first insulation glue or the second insulation glue, it is beneficial to match the solder ribbon formed subsequently by using the thinning feature of the thickness of at least one edge of the insulation glue in the second direction, thereby reducing the height difference between at least part of the solder ribbon and the cell sheet, reducing the degree of bending of the solder ribbon itself, thereby reducing the stress caused by the solder ribbon to the cell sheet, and reducing the risk of cell sheet breakage. In addition, the reduction of the degree of bending of the solder ribbon itself can also improve the service life of the solder ribbon to some extent. Moreover, the amount of insulation glue required for preparing the insulation glue can be reduced by means of the screen, thereby being beneficial to reducing the preparation cost of the photovoltaic module.

[0040] In the description of the embodiments of the present disclosure, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0041] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present disclosure. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0042] In the description of the embodiments of the present disclosure, the term "and / or" is only a description of the association relationship of associated objects, that is, there can be three relationships, for example, A and / or B, which can represent: there is A, there is A and B, and there is B. In addition, the character " / " herein generally represents that the front and rear associated objects are in an "or" relationship.

[0043] In the description of the embodiments of the present disclosure, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0044] In the description of the embodiments of the present disclosure, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present disclosure.

[0045] In the description of the embodiments of the present disclosure, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0046] In the corresponding drawings of the embodiments of the present disclosure, in order to better understand and facilitate the description, the thickness and area of the layer are enlarged. When describing that a component (such as a layer, a film, a region, or a substrate) is on or on the surface of another component, the component can be "directly" on the surface of the other component, or there can be a third component between the two components. On the contrary, when describing that a component is on the surface of another component or that a component surface is formed or provided with another component, it is indicated that there is no third component between the two components. In addition, when describing that a component is "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 part of the edge of the entire surface.

[0047] In the description of the embodiments of the present disclosure, when a certain component "includes" another component, unless otherwise specified, other components are not excluded, and other components can be further included. In addition, when a layer, film, region, plate, or the like is referred to as "on" or "under" another component, it can be "directly on" or "directly under" the other component (i.e., between the other component and the layer, film, region, plate, or the like, no other component is present). In addition, when a layer, film, region, plate, or the like is "directly on" another component, or when a layer, film, region, plate, or the like is on the surface of another component, it means that no other component is present therebetween.

[0048] The terms used in the description of various described embodiments herein are for the purpose of describing particular embodiments only and are not intended to be limiting. As used in the description of various embodiments of the disclosure and the appended claims, "the means" is intended to include plural forms, unless the context clearly indicates otherwise. Among them, the components include layers, films, regions, or plates and the like.

[0049] The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. However, those skilled in the art can understand that in the embodiments of the present disclosure, many technical details are proposed in order to enable the reader to better understand the embodiments of the present disclosure. However, the technical solutions claimed by the embodiments of the present disclosure can be realized even without these technical details and various changes and modifications based on the following embodiments.

[0050] An embodiment of the present disclosure provides a solar cell, which will be described in detail below with reference to the accompanying drawings.

[0051] Combined with reference Figures 1 to 11 , Figure 1 A partial top view schematic diagram of a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure, Figures 2 to 11 The method for manufacturing a photovoltaic module will be described in detail below. The method for manufacturing a photovoltaic module includes: providing a cell sheet 100; providing a screen 101, and forming an insulating glue 102 on the cell sheet 100 by using the screen 101.

[0052] It is worth noting that in order to form the insulating glue 102 with a thickness that can change according to the preset requirements, the method for manufacturing a photovoltaic module according to an embodiment of the present disclosure provides that the step of providing a screen 101 to form the insulating glue 102 includes at least providing the following four types of screens 101 to form two types of insulating glue 102 with a thickness gradient.

[0053] Specifically, the first screen 111 can be used to form the first insulating glue 112 with gradually increasing and then gradually decreasing thickness in the second direction Y, and / or the second screen 121 can be used to form the second insulating glue 122 with gradually increasing thickness in the second direction Y. Whether the thickness of the insulating glue 102 in the second direction Y is gradually changed as in the first insulating glue 112 or as in the second insulating glue 122, it is beneficial to use the thinning feature of the thickness of the insulating glue 102 at at least one edge in the second direction Y to match the subsequently formed solder ribbon, thereby reducing the height difference between at least part of the solder ribbon and the battery piece 100, reducing the bending degree of the solder ribbon itself, thereby reducing the stress caused by the solder ribbon to the battery piece 100, and reducing the risk of the battery piece 100 breaking. In addition, the reduction of the bending degree of the solder ribbon itself can also improve the service life of the solder ribbon to some extent. Moreover, the amount of insulating glue 102 required for preparation can be reduced by means of the screen 101, thereby facilitating the reduction of the preparation cost of the photovoltaic module. It is worth noting that the gradually changing thickness of the insulating glue 102 formed by the preparation method of the photovoltaic module provided by the embodiment of the present disclosure can be applied to various situations in the photovoltaic module, and the application situations of the insulating glue 102 with gradually changing thickness in the second direction Y will be described in detail later.

[0054] It should be noted that, Figures 2 to 11 The screen 101 shown is a region corresponding to a single insulating glue 102. In actual application, for a whole battery piece, a large screen can be used, which includes a plurality of screens as shown Figures 2 to 11 The screen 101 shown is a region corresponding to a single insulating glue 102. In actual application, for a whole battery piece, a large screen can be used, which includes a plurality of screens as shown

[0055] It is worth emphasizing that in the preparation method of the photovoltaic module provided by the embodiment of the present disclosure, the insulating glue 102 with gradually changing thickness in the second direction Y is mainly formed by the cooperation between the screen 101 with gradually changing thickness in the second direction Y and the raw material for forming the insulating glue 102, and the certain fluidity of the raw material for forming the insulating glue 102 under heat is only an auxiliary role. In some cases, it is precisely because of the design of the screen 101 with gradually changing thickness in the second direction Y that the insulating glue 102 formed based on the screen 101 has gradually changing thickness in the second direction Y along the entire length in the first direction X. In other words, along the first direction X, not only the edge region of the insulating glue 102 has gradually changing thickness in the second direction Y, but also the center region of the insulating glue 102 has gradually changing thickness in the second direction Y.

[0056] The following describes the first insulating glue 112 formed by the first screen 111 in the second direction Y, which gradually increases in thickness and then gradually decreases. The first screen 111 is at least divided into two types as follows:

[0057] The first type is as follows: Figure 2 Figure 3 Figure 4 The first screen 111 is provided to form the first insulating glue 112 on the battery piece 100, wherein in the first direction X, the thickness of the first screen 111 in the second direction Y gradually decreases and then gradually increases, and the side 111a of the first screen 111 facing the battery piece 100 is recessed away from the battery piece 100, so that the thickness of the first insulating glue 112 in the second direction Y gradually increases and then gradually decreases.

[0058] Figure 2 FIG. 1 is a first partial cross-sectional view of the screen corresponding to the insulating glue in the preparation method of the photovoltaic module according to an embodiment of the present disclosure; Figure 3 FIG. 1 is a first partial cross-sectional view of the screen corresponding to the insulating glue in the preparation method of the photovoltaic module according to an embodiment of the present disclosure; Figure 4 FIG. 1 is a first partial cross-sectional view of the screen corresponding to the insulating glue in the preparation method of the photovoltaic module according to an embodiment of the present disclosure.

[0059] It should be noted that the first screen 111 has opposite upper and lower sides in the second direction Y. The side 111b of the first screen 111 away from the battery piece 100 is the upper side, and the side 111a of the first screen 111 facing the battery piece 100 is the lower side. Figures 2 to 4 ​​​The principle of the first screen 111 forming the first insulating glue 112 is that in the process of preparing the first insulating glue 112 by using the first screen 111, the raw material of the first insulating glue 112 penetrates the first screen 111 from the side 111b of the first screen 111 away from the battery piece 100, that is, the upper side along the second direction Y downward. Based on this, the thickness of the first screen 111 in the second direction Y gradually decreases and then gradually increases along the first direction X, and the side 111a of the first screen 111 facing the battery piece 100 is recessed away from the battery piece 100. Therefore, when printing the raw material of the first insulating glue 112 from the side 111b of the first screen 111 away from the battery piece 100, along the first direction X, on the one hand, the thicker the area of the first screen 111, the more raw material of the first insulating glue 112 remains in the mesh hole, on the other hand, the thicker the area of the first screen 111, the longer the time it takes for the raw material of the first insulating glue 112 to penetrate the first screen 111 and be printed on the battery piece 100. The influence of the two factors makes the thickness of the first insulating glue 112 printed on the battery piece 100 corresponding to the thicker area of the first screen 111 smaller, thereby forming the first insulating glue 112 with the thickness gradually increasing and then gradually decreasing in the second direction Y.

[0060] Second type: reference Figure 5 Or Figure 6 The first screen 111 is provided to form the first insulating glue 112 on the battery piece 100, wherein along the first direction X, the thickness of the first screen 111 in the second direction Y gradually increases and then gradually decreases, and the side 111b of the first screen 111 away from the battery piece 100 is convex away from the battery piece 100, thereby making the thickness of the first insulating glue 112 in the second direction Y gradually increase and then gradually decrease.

[0061] Wherein, Figure 5 A fourth partial cross-sectional view of a screen corresponding to an insulating glue in a preparation method of a photovoltaic module according to an embodiment of the present disclosure is provided; Figure 6 A fifth partial cross-sectional view of a screen corresponding to an insulating glue in a preparation method of a photovoltaic module according to an embodiment of the present disclosure is provided.

[0062] It should be noted that the first screen 111 has opposite upper and lower sides along the second direction Y, the side 111b of the first screen 111 away from the battery piece 100 is the upper side, and the side 111a of the first screen 111 facing the battery piece 100 is the lower side. Figure 5 Or Figure 6The principle of forming the first insulating adhesive 112 using the first screen printing plate 111 is as follows: During the preparation of the first insulating adhesive 112 using the first screen printing plate 111, the raw material of the first insulating adhesive 112 penetrates the first screen printing plate 111 from the side 111b away from the battery cell 100, i.e., from the upper side along the second direction Y, downwards. Based on this, the design is such that the thickness of the first screen printing plate 111 in the second direction Y gradually increases and then gradually decreases along the first direction X, and the side 111b away from the battery cell 100 of the first screen printing plate 111 bulges away from the battery cell 100. Therefore, when printing the raw material of the first insulating adhesive 112 from the side 111b away from the battery cell 100 of the first screen printing plate 111, the thicker the area of ​​the first screen printing plate 111, the thicker the first insulating adhesive 112 that can ultimately be printed on the battery cell 100, thus forming a first insulating adhesive 112 whose thickness gradually increases and then gradually decreases in the second direction Y.

[0063] The following is a detailed description of the second insulating adhesive 122 formed in the second direction Y using the second screen 121, which has a gradually increasing thickness. The second screen 121 can be divided into at least the following two main types:

[0064] Third type: Reference Figure 7 , Figure 8 or Figure 9 A second screen 121 is provided to form a second insulating adhesive 122 on the battery cell 100, wherein the thickness of the second screen 121 gradually decreases along the first direction X and in the second direction Y, and the side 121a of the second screen 121 facing the battery cell 100 is recessed in a direction away from the battery cell 100, thereby making the thickness of the second insulating adhesive 122 gradually increase in the second direction Y.

[0065] in, Figure 7 This is a sixth partial cross-sectional view of the insulating adhesive corresponding to the screen printing plate in a method for preparing a photovoltaic module provided in an embodiment of this disclosure; Figure 8 This is a seventh partial cross-sectional view of the insulating adhesive corresponding to the screen printing plate in a method for preparing a photovoltaic module according to an embodiment of this disclosure; Figure 9 This is an eighth partial cross-sectional view of the insulating adhesive corresponding to the screen printing plate in a method for preparing a photovoltaic module provided in an embodiment of this disclosure.

[0066] It should be noted that the second screen 121 has an upper side and a lower side opposite to each other along the second direction Y. The side 121b of the second screen 121 away from the battery cell 100 is the upper side, and the side 121a of the second screen 121 facing the battery cell 100 is the lower side. Figures 7 to 9The principle of forming the second insulating adhesive 122 using the second screen 121 is as follows: during the process of preparing the second insulating adhesive 122 using the second screen 121, the raw material of the second insulating adhesive 122 penetrates the second screen 121 from the side 121b away from the battery cell 100, that is, from the upper side along the second direction Y downwards. Based on this, the design is such that the thickness of the second screen 121 gradually decreases along the first direction X and along the second direction Y. Furthermore, the side 121a of the second screen 121 facing the battery cell 100 is recessed away from the battery cell 100. Therefore, when printing the raw material of the second insulating adhesive 122 from the side 121b away from the battery cell 100 of the second screen 121, along the first direction X, on the one hand, the thicker the area of ​​the second screen 121, the more raw material of the second insulating adhesive 122 remains in the mesh. On the other hand, the thicker the area of ​​the second screen 121, the longer it takes for the raw material of the second insulating adhesive 122 to be printed onto the battery cell 100. These two factors result in a smaller thickness of the second insulating adhesive 122 printed onto the battery cell 100 in the thicker area of ​​the second screen 121, thus forming a second insulating adhesive 122 with a gradually increasing thickness along the second direction Y.

[0067] Fourth type: Reference Figure 10 or Figure 11 A second screen 121 is provided to form a second insulating adhesive 122 on the battery cell 100. Along the first direction X, the thickness of the second screen 121 in the second direction Y gradually increases, and the side 121b of the second screen 121 away from the battery cell 100 protrudes in the direction away from the battery cell 100, thereby making the thickness of the second insulating adhesive 122 in the second direction Y gradually increase.

[0068] in, Figure 10 This is a ninth partial cross-sectional schematic diagram of the insulating adhesive corresponding to the screen printing plate in a photovoltaic module manufacturing method provided in an embodiment of this disclosure; Figure 11 This is a tenth partial cross-sectional view of the insulating adhesive corresponding to the screen printing plate in a method for preparing a photovoltaic module according to an embodiment of this disclosure.

[0069] It should be noted that the second screen 121 has an upper side and a lower side opposite to each other along the second direction Y. The side 121b of the second screen 121 away from the battery cell 100 is the upper side, and the side 121a of the second screen 121 facing the battery cell 100 is the lower side. Figure 10 and Figure 11The principle of forming the second insulating glue 122 by the second screen 121 is that in the process of preparing the second insulating glue 122 by the second screen 121, the raw material of the second insulating glue 122 penetrates the second screen 121 from the side 121b of the second screen 121 away from the battery piece 100, i.e., the upper side, along the second direction Y. Based on this, the thickness of the second screen 121 in the second direction Y gradually increases along the first direction X, and the side 121b of the second screen 121 away from the battery piece 100 protrudes away from the battery piece 100. Therefore, when printing the raw material of the second insulating glue 122 from the side 121b of the second screen 121 away from the battery piece 100, the thicker the area of the second screen 121, the thicker the second insulating glue 122 printed on the battery piece 100, thereby forming the first insulating glue 112 with gradually increasing thickness in the second direction Y.

[0070] In the above various examples, the first direction X is the length direction of the insulating glue 102, and the second direction Y is the thickness direction of the battery piece 100.

[0071] It should be noted that in some cases, the plurality of insulating glues 102 formed on the same battery piece 100 or different battery pieces 100 in the photovoltaic module prepared by the embodiment of the present disclosure can all be the first insulating glue 112, i.e., formed by the first screen 111; in other cases, the plurality of insulating glues 102 formed on the same battery piece 100 or different battery pieces 100 can all be the second insulating glue 122, i.e., formed by the second screen 121; in still other cases, the plurality of insulating glues 102 formed on the same battery piece 100 or different battery pieces 100 can be partially the first insulating glue 112 and partially the second insulating glue 122, i.e., both the first screen 111 and the second screen 121 are used.

[0072] The preparation method of the photovoltaic module provided by the embodiment of the present disclosure will be described in more detail below with reference to the accompanying drawings. It should be noted that in the various embodiments described below, the screen 101 includes at least one of the first screen 111 and the second screen 121, and the insulating glue 102 includes at least one of the first insulating glue 112 and the second insulating glue 122.

[0073] In some embodiments, with reference to Figures 2 to 11 , along the first direction X, the length of the screen 101 is less than the length of the insulating glue 102. It should be noted that the raw material for forming the insulating glue 102 has a certain flowability when heated, so the screen 101 is used to print the raw material of the insulating glue 102 on the battery piece 100 (with reference to Figure 1When the raw material of the printed insulation glue 102 is printed on the battery sheet 100, the raw material of the insulation glue 102 printed on the battery sheet 100 will further spread towards the four edges of the screen 101, so that the length of the finally formed insulation glue 102 is greater than the length of the screen 101. In this way, not only is it beneficial to form the insulation glue 102 with a thickness gradient in the second direction Y using the screen 101, but also more areas that need to be insulated can be covered using less insulation glue 102, thereby reducing the cost of preparing the photovoltaic assembly.

[0074] In some cases, the ratio of the length of the screen 101 to the length of the insulation glue 102 in the first direction X is greater than 1 and less than or equal to 1.3, for example, the ratio of the length of the screen 101 to the length of the insulation glue 102 can be 1.05, 1.08, 1.1, 1.12, 1.15, 1.16, 1.18, 1.2, 1.22, 1.25 or 1.28, etc. It is worth noting that the thicker the thickness of the insulation glue 102 required to be prepared in the second direction Y, the more the raw material of this part of the insulation glue 102 will flow to the four edges based on gravity. Based on this, a new type of screen 101 is designed so that the thickness of at least one edge of the insulation glue 102 formed based on the screen 101 in the second direction Y tends to be thin, which is beneficial to control the degree of overflow of the insulation glue 102 at the edge of the screen 101, avoid excessive overflow of the insulation glue 102, and affect the electrical connection of other components on the battery sheet 100. Specifically, in the preparation method of the photovoltaic assembly provided by an embodiment of the present disclosure, the ratio of the length of the screen 101 to the length of the finally formed insulation glue 102 in the first direction X can be controlled to be greater than 1 and less than or equal to 1.3 based on the new type of screen 101 designed, so as to avoid excessive overflow of the insulation glue 102.

[0075] In some embodiments, the length of the screen 101 in the first direction X can be 9mm-10mm, for example, the length of the screen 101 can be 9.08mm, 9.1mm, 9.16mm, 9.2mm, 9.25mm, 9.3mm, 9.36mm, 9.4mm, 9.48mm, 9.5mm, 9.55mm, 9.6mm, 9.66mm, 9.7mm, 9.72mm, 9.8mm, 9.88mm, 9.9mm or 9.95mm. It should be noted that in actual application, the length of the screen 101 can also be designed to be other values based on the length of the insulation glue required to be formed in the first direction X.

[0076] In some embodiments, with reference to Figures 2 to 11For example, the thinnest portion of the screen 101 along the first direction X can have a thickness of 13 μm, 14 μm, 15 μm, 16 μm, or 17 μm, and the thickest portion of the screen 101 can have a thickness of 106 μm, 107 μm, 108 μm, 109 μm, 110 μm, 111 μm, 112 μm, 113 μm, or 114 μm.

[0077] In one example, the thinnest portion of the screen 101 can have a thickness of 15 μm, and the thickest portion of the screen 101 can have a thickness of 100 μm, i.e., the thickness of the screen 101 along the first direction X gradually changes from 15 μm to 100 μm and / or gradually changes from 100 μm to 15 μm along the second direction Y.

[0078] In some embodiments, the thinnest portion of the insulating glue 102 along the first direction X can have a thickness of 8 μm to 12 μm, and the thickest portion of the insulating glue 102 can have a thickness of 60 μm to 80 μm. For example, the thinnest portion of the insulating glue 102 along the first direction X can have a thickness of 9 μm, 10 μm, or 11 μm, and the thickest portion of the insulating glue 102 can have a thickness of 61 μm, 62 μm, 63 μm, 64 μm, 65 μm, 66 μm, 67 μm, 68 μm, 69 μm, 70 μm, 71 μm, 72 μm, 73 μm, 74 μm, 75 μm, 76 μm, 77 μm, 78 μm, or 79 μm.

[0079] In one example, the thinnest portion of the insulating glue 102 can have a thickness of 10 μm, and the thickest portion of the insulating glue 102 can have a thickness of 60 μm, i.e., the thickness of the insulating glue 102 gradually changes from 10 μm to 60 μm and / or gradually changes from 60 μm to 10 μm along the first direction X.

[0080] It is worth noting that the screen 101 along the first direction X can be divided into multiple regions, each of which corresponds to a plurality of regions in the insulating glue 102. Along the second direction Y, the thickness of the screen 101 in the portion opposite to the insulating glue 102 is slightly greater than the thickness of the insulating glue 102, because the raw materials of the insulating glue 102 are partially retained in the screen 101 during the process of preparing the insulating glue 102 by using the screen 101.

[0081] In some cases, the insulating adhesive 102 gradually increases from the thinnest part to the thickest part along the first direction X with a slope of 8-16. In other words, the thickness of the insulating adhesive 102 in the second direction Y per unit length gradually increases or decreases by 8-16 μm along the first direction X.

[0082] The following describes in more detail the recess of the screen 101 toward the side of the battery piece 100 away from the battery piece 100.

[0083] In some embodiments, referring to Figure 2 or Figure 3 , in the first screen 111 provided with a reference cross section perpendicular to the first direction X, the cross-sectional area of the first screen 111 on the reference cross section gradually decreases and then gradually increases along the first direction X, so that the thickness of the first screen 111 in the second direction Y gradually decreases and then gradually increases.

[0084] Moreover, in some cases, referring to Figure 2 , the side 111a of the first screen 111 toward the battery piece 100 (referring to Figure 1 ) is a curved surface, and the side 111b of the first screen 111 away from the battery piece 100 is a flat surface; in other cases, referring to Figure 3 , the side 111a of the first screen 111 toward the battery piece 100 is two intersecting inclined surfaces, and the side 111b of the first screen 111 away from the battery piece 100 is a flat surface. In this way, the side 111a of the first screen 111 toward the battery piece 100 is recessed toward the direction away from the battery piece 100.

[0085] It should be noted that the side 111b of the first screen 111 away from the battery piece 100 is a flat surface relative to the surface of the battery piece 100 on which the first insulating adhesive 112 is to be prepared, and the side 111a of the first screen 111 toward the battery piece 100 is a curved surface or two intersecting inclined surfaces relative to the surface of the battery piece 100 on which the first insulating adhesive 112 is to be prepared.

[0086] In addition, Figure 2 and Figure 3 , the first screen 111 shown in the figures is only two specific examples of "the thickness of the first screen 111 in the second direction Y gradually decreases and then gradually increases along the first direction X, and the side 111a of the first screen 111 toward the battery piece 100 is recessed toward the direction away from the battery piece 100" in one embodiment of the present disclosure. In actual applications, other cross-sectional shapes of the first screen that meet the foregoing requirements can also ultimately form a first insulating adhesive 112 similar to that shown in Figure 2 and Figure 3 .

[0087] In some examples, Figure 2and Figure 3 The first screen 111 shown has a central axis, and the first screen 111 can be axisymmetric along the central axis.

[0088] In some embodiments, with reference to Figure 7 or Figure 8 , the second screen 121 provided has a cross-sectional area on the reference cross-section gradually decreasing along the first direction X, and the thickness of the second screen 121 along the second direction Y gradually decreases.

[0089] In some cases, with reference to Figure 7 , the side 121a of the second screen 121 facing the battery piece 100 is curved, and the side 121b of the second screen 121 away from the battery piece 100 is flat; in other cases, with reference to Figure 8 , the side 121a of the second screen 121 facing the battery piece 100 is curved, and the side 121b of the second screen 121 away from the battery piece 100 is flat. In this way, the side 121a of the second screen 121 facing the battery piece 100 is recessed away from the battery piece 100.

[0090] It should be noted that the side 121b of the second screen 121 away from the battery piece 100 being flat is relative to the surface of the battery piece 100 on which the second insulating adhesive 122 is to be prepared, and the side 121a of the second screen 121 facing the battery piece 100 being curved or beveled is also relative to the surface of the battery piece 100 on which the second insulating adhesive 122 is to be prepared.

[0091] In addition, Figure 7 and Figure 8 The second screen 121 shown is only one of the two specific examples of "the thickness of the second screen 121 along the second direction Y gradually decreases along the first direction X, and the side of the second screen 121 facing the battery piece 100 is recessed away from the battery piece 100" in one embodiment of the present disclosure. In actual applications, other cross-sectional shapes of the second screen that meet the aforementioned requirements can also ultimately form a second insulating adhesive 122 similar to that shown in Figure 7 and Figure 8 .

[0092] In some examples, Figure 2 and Figure 3 The first screen 111 shown has a central axis, and the first screen 111 can be axisymmetric along the central axis, and Figure 7 The second screen 121 shown can be Figure 2 half of the first screen 111 along the central axis, Figure 8 The second screen 121 shown can be Figure 3 half of the first screen 111 along the central axis.

[0093] The following will describe in more detail the side of the screen 101 away from the battery piece 100 protruding away from the battery piece 100.

[0094] In some embodiments, referring to Figure 5 or Figure 6 , in the first screen 111 provided with a reference cross section perpendicular to the first direction X, the cross-sectional area of the first screen 111 on the reference cross section gradually increases first and then gradually decreases along the first direction X, and the thickness of the first screen 111 gradually increases first and then gradually decreases along the second direction Y.

[0095] Moreover, in some cases, referring to Figure 5 , the side 111b of the first screen 111 away from the battery piece 100 is two intersecting inclined surfaces, and the side 111a of the first screen 111 towards the battery piece 100 is a flat surface; in other cases, referring to Figure 6 , the side 111b of the first screen 111 away from the battery piece 100 is two intersecting curved surfaces, and the side 111a of the first screen 111 towards the battery piece 100 is a flat surface. In this way, the side 111b of the first screen 111 away from the battery piece 100 protrudes away from the battery piece 100.

[0096] It should be noted that the side 111a of the first screen 111 towards the battery piece 100 is a flat surface relative to the surface of the battery piece 100 required to prepare the first insulating glue 112, and the side 111b of the first screen 111 away from the battery piece 100 is two intersecting inclined surfaces or two intersecting curved surfaces relative to the surface of the battery piece 100 required to prepare the first insulating glue 112.

[0097] In addition, Figure 5 and Figure 6 The first screen 111 shown in the two specific examples of the first screen 111 in the embodiment of the present disclosure "along the first direction X, the thickness of the first screen 111 in the second direction Y gradually increases first and then gradually decreases, and the side of the first screen 111 away from the battery piece 100 protrudes away from the battery piece 100" is only two specific examples, and in actual application, other cross-sectional shapes of the first screen that meet the foregoing requirements can also ultimately form a first insulating glue 112 similar to that shown in Figure 5 and Figure 6 .

[0098] In some examples, Figure 5 and Figure 6 The first screen 111 shown in the first screen 111 has a central axis, and the first screen 111 can be axisymmetric along the central axis.

[0099] In other embodiments, referring to Figure 10 orFigure 11 With a plane perpendicular to the first direction X as a reference section, in the provided second screen 121, the cross-sectional area of ​​the second screen 121 on the reference section gradually increases along the first direction X, and the thickness of the second screen 121 in the second direction Y gradually increases.

[0100] Moreover, in some cases, referencing Figure 10 The side 121b of the second screen printing plate 121 away from the battery cell 100 is an inclined plane, and the side 121a of the second screen printing plate 121 facing the battery cell 100 is a flat plane; in other cases, refer to Figure 11 The side 121b of the second screen printing plate 121 away from the battery cell 100 is curved, while the side 121a of the second screen printing plate 121 facing the battery cell 100 is flat. This causes the side 121b of the second screen printing plate 121 away from the battery cell 100 to bulge away from the battery cell 100.

[0101] It should be noted that the side 121a of the second screen 121 facing the battery cell 100 is flat relative to the surface of the battery cell 100 where the second insulating adhesive 122 is to be prepared, and the side 121b of the second screen 121 away from the battery cell 100 is inclined or curved relative to the surface of the battery cell 100 where the second insulating adhesive 122 is to be prepared.

[0102] also, Figure 10 and Figure 11 The second screen plate 121 shown is only one specific example in one embodiment of this disclosure, where "the thickness of the second screen plate 121 gradually increases along the first direction X and along the second direction Y, and the side of the second screen plate 121 away from the battery cell 100 bulges away from the battery cell 100." In practical applications, other cross-sectional shapes of second screen plates that meet the aforementioned requirements can also ultimately form a similar shape. Figure 10 and Figure 11 The second insulating adhesive 122 is shown.

[0103] In some examples, Figure 5 and Figure 6 The first screen printing plate 111 shown has a central axis, and the first screen printing plate 111 can be axially symmetrical about the central axis, and Figure 10 The second version 121 shown can be Figure 5 The first screen printing plate 111 shown is located halfway along its central axis. Figure 11 The second version 121 shown can be Figure 6 The first screen 111 shown is half along the central axis.

[0104] The following description, in conjunction with the accompanying drawings, provides a more detailed explanation of why screen plate 101 is recessed not only on the side facing the battery cell 100 in a direction away from the battery cell 100, but also on the side away from the battery cell 100 in a direction closer to the battery cell 100.

[0105] In some embodiments, reference Figure 4 With a plane perpendicular to the first direction X as a reference section, in the provided first screen 111, along the first direction X, the cross-sectional area of ​​the first screen 111 on the reference section first gradually decreases and then gradually increases. The side of the first screen 111 facing the battery cell 100 is concave in the direction away from the battery cell 100, and the side of the first screen 111 away from the battery cell 100 is concave in the direction closer to the battery cell 100.

[0106] Thus, due to the influence of two factors, the thicker the area of ​​the first screen 111, the more raw material of the first insulating adhesive 112 will remain in the mesh, and the longer it will take for the raw material of the first insulating adhesive 112 in the thicker area of ​​the first screen 111 to be printed onto the battery cell 100 through the first screen 111, the thickness of the first insulating adhesive 112 in the second direction Y will gradually increase and then gradually decrease.

[0107] In some cases, refer to Figure 4 Both the side 111b of the first screen printing plate 111 away from the battery cell 100 and the side 111a of the first screen printing plate 111 facing the battery cell 100 can be curved surfaces; in other cases, both the side of the first screen printing plate away from the battery cell and the side of the first screen printing plate facing the battery cell can be two intersecting inclined surfaces; or, one of the side of the first screen printing plate away from the battery cell and the side of the first screen printing plate facing the battery cell can be a curved surface, and the other can be two intersecting inclined surfaces.

[0108] It should be noted that the side 111b of the first screen 111 away from the battery cell 100 and the side 111a of the first screen 111 facing the battery cell 100 are curved surfaces or two intersecting inclined surfaces, all of which are relative to the surface of the battery cell 100 where the first insulating adhesive 112 is to be prepared.

[0109] also, Figure 4 The first screen printing plate 111 shown is merely a specific example of an embodiment of this disclosure, where "along the first direction X, the cross-sectional area of ​​the first screen printing plate 111 on the reference section gradually decreases and then gradually increases; the side of the first screen printing plate 111 facing the battery cell 100 is concave away from the battery cell 100, and the side of the first screen printing plate 111 away from the battery cell 100 is concave towards the battery cell 100." In practical applications, other cross-sectional shapes of the first screen printing plate that meet the aforementioned requirements can also ultimately form a similar shape. Figure 4 The first insulating adhesive 112 is shown.

[0110] In other embodiments, reference is made to... Figure 9With reference to a cross section perpendicular to the first direction X, in the second screen 121 provided, the cross-sectional area of the second screen 121 on the cross section gradually decreases along the first direction X, the side 121a of the second screen 121 facing the battery piece 100 is recessed away from the battery piece 100, and the side 121b of the second screen 121 away from the battery piece 100 is recessed towards the battery piece 100.

[0111] In this way, based on the influence of two aspects that the more raw materials of the second insulating glue 122 remaining in the mesh holes at the thicker area of the second screen 121, and the longer time spent by the raw materials of the second insulating glue 122 at the thicker area of the second screen 121 to print on the battery piece 100 through the second screen 121, the second insulating glue 122 with gradually increasing thickness in the second direction Y is formed.

[0112] In some cases, with reference to Figure 9 , the side 121b of the second screen 121 away from the battery piece 100 and the side 121a of the second screen 121 facing the battery piece 100 can both be curved surfaces; in other cases, the side of the second screen away from the battery piece and the side of the second screen facing the battery piece can both be inclined surfaces; or one of the side of the second screen away from the battery piece and the side of the second screen facing the battery piece can be a curved surface, and the other can be an inclined surface.

[0113] It should be noted that the side 121b of the second screen 121 away from the battery piece 100 and the side 121a of the second screen 121 facing the battery piece 100 being curved surfaces or inclined surfaces are both relative to the surface of the battery piece 100 required to prepare the second insulating glue 122.

[0114] In addition, Figure 9 The second screen 121 shown is only a specific example of "along the first direction X, the cross-sectional area of the second screen 121 on the cross section gradually decreases, the side 121a of the second screen 121 facing the battery piece 100 is recessed away from the battery piece 100, and the side 121b of the second screen 121 away from the battery piece 100 is recessed towards the battery piece 100" in an embodiment of the present disclosure. In actual application, other cross-sectional shapes of the second screen that meet the foregoing requirements can also ultimately form a second insulating glue 122 similar to that shown in Figure 9 .

[0115] The application cases of the insulating glue 102 with gradually changing thickness in the second direction Y are described in detail below.

[0116] In some embodiments, with reference to Figure 12 , Figure 12A partial top view of a photovoltaic module prepared by the method provided by an embodiment of the present disclosure is shown in FIG. 1. The step of providing a cell 100 can include: providing a back contact cell 110, the back contact cell 110 being provided with first fine grids 120 and second fine grids 130 arranged alternately on the back surface of the back contact cell 110; and providing a first screen 111 to form first insulating glue 112 on the cell 100. The step of providing the first screen 111 to form the first insulating glue 112 on the cell 100 can include: forming a plurality of first insulating glues 112 arranged along a first direction X, the first insulating glues 112 being arranged on the first fine grids 120 or the second fine grids 130.

[0117] It should be noted that the back contact cell 110 can be a back contact cell without main grids or a back contact cell with main grids. In addition, Figure 12 In FIG. 1, the first insulating glues 112 are drawn in a perspective view to show the first fine grids 120 and the second fine grids 130 on the cell 100.

[0118] In some cases, for the back contact cell with main grids, part of the first fine grids 120 and part of the second fine grids 130 are provided with pads (not shown in the figure) of a larger size. A single pad can be electrically connected to one of a plurality of first fine grids 120 or a plurality of second fine grids 130 at the same time. The two sides of the single pad along the first direction X can be respectively provided with the first insulating glues 112, and the first insulating glues 112 are arranged on the other one of the first fine grids 120 or the second fine grids 130 which is not electrically connected to the pad. Similarly, the two sides of the main grid (not shown in the figure) along the first direction X can be respectively provided with the first insulating glues 112, and the first insulating glues 112 are arranged on the other one of the first fine grids 120 or the second fine grids 130 which is not electrically connected to the main grid. In this way, at least two first insulating glues 112 can be arranged at intervals along the first direction X, as shown in FIG. 1. Figure 12

[0119] In other cases, for the back contact cell without main grids, two first insulating glues arranged along the first direction can be in contact.

[0120] After the first screen 111 is provided to form the first insulating glue 112 on the cell 100, the method can further include: continuing to refer to FIG. 1, Figure 12 a plurality of solder strips 103 arranged at intervals along the first direction X are formed. In the same solder strip 103, the solder strip 103 is electrically connected to one of the first fine grids 120 and the second fine grids 130, and the solder strip 103 is electrically insulated from the other one of the first fine grids 120 and the second fine grids 130. In some cases, referring to FIG. 1, Figure 12 the solder strip 103 can be located between two adjacent first insulating glues 112; in other cases, referring to FIG. 1, Figure 13 Figure 13 ​​A partial sectional view of the photovoltaic module provided by the method is shown in the figure. The solder strip 103 can be located between two adjacent first insulating glue 112 and abut against both of the two first insulating glue 112. In other cases, the solder strip is located between two adjacent first insulating glue and can only abut against one of the two first insulating glue.

[0121] In this way, the solder strip 103 can be electrically insulated from the other one of the first fine grid 120 and the second fine grid 130 by the first insulating glue 112 located on both sides of the solder strip 103. In addition, the first insulating glue 112 can be designed to be thicker in the middle and thinner at both ends, so that the solder strip 103 is located on the region with thinner thickness of the first insulating glue 112, which can play a certain positioning role for the solder strip 103. Specifically, in the direction away from the solder strip 103, the thickness of the first insulating glue 112 located on both sides of the solder strip 103 in the first direction X gradually increases, so that the solder strip 103 is not easy to deviate in the first direction X. Based on the influence of the gravity of the solder strip 103 itself and the resistance of the first insulating glue 112 with thicker thickness to the solder strip 103, the solder strip 103 is more likely to be located at the edge between the two adjacent first insulating glue 112.

[0122] In addition, for the back contact cell without main grid, along the extension direction of the solder strip 103, there are at least two fine grids of the same type in contact with the solder strip 103. The solder strip 103 is located on the region with thinner thickness of the first insulating glue 112, which is conducive to reducing the height difference between the part of the solder strip 103 abutting against the first insulating glue 112 and the part in contact with the fine grid of the same type, thereby effectively reducing the bending degree of the solder strip 103 itself.

[0123] In other embodiments, referring to Figure 14 , Figure 14 Another partial top view of the photovoltaic module provided by the method is shown in the figure. The step of providing the cell 100 can include: providing a back contact cell 110, and the back surface of the back contact cell 110 is provided with first fine grids 120 and second fine grids 130 arranged alternately. The step of providing the first screen 111 to form the first insulating glue 112 on the cell 100 can include: forming a plurality of first insulating glue 112 arranged at intervals in the first direction X, and the first insulating glue 112 covers the first fine grid 120 or the second fine grid 130.

[0124] It should be noted that the back contact cell sheet 110 can be a back contact cell sheet without main grids, or a back contact cell sheet with main grids. In addition, the first insulating glue 112 covers one of the first fine grids 120 and the second fine grids 130, and the other one of the first fine grids 120 and the second fine grids 130 is exposed between two adjacent first insulating glues 112 in the first direction X, facilitating the subsequent electrical connection of the solder strip 103 and the other one of the first fine grids 120 and the second fine grids 130. Figure 14 In the middle, the first insulating glue 112 is drawn in a perspective manner to show the first fine grids 120 and the second fine grids 130 on the cell sheet 100.

[0125] After providing the first screen 111 to form the first insulating glue 112 on the cell sheet 100, the preparation method can further include: Figure 14 and Figure 15 , Figure 15 An embodiment of the present disclosure provides another partial cross-sectional schematic view of a preparation method of a photovoltaic module in which an insulating glue is formed on a cell sheet. A plurality of solder strips 103 are arranged in the first direction X. In the same solder strip 103, the solder strip 103 is electrically connected to one of the first fine grids 120 and the second fine grids 130, and the solder strip 103 is electrically insulated from the other one of the first fine grids 120 and the second fine grids 130. The solder strip 103 is centrally arranged on the first insulating glue 112.

[0126] In this way, not only can the electrical insulation of the solder strip 103 and the other one of the first fine grids 120 and the second fine grids 130 be achieved by means of the first insulating glue 112 located directly below the solder strip 103, but also the solder strip 103 is centrally arranged on the first insulating glue 112, which is conducive to making the thickness of the first insulating glue 112 opposite the solder strip 103 in the second direction Y the thickest. Therefore, during the subsequent welding of the solder strip 103 on the cell sheet 100 and the lamination process, the phenomenon of solder strip 103 burr caused by the softening of the first insulating glue 112 can be effectively avoided, and the phenomenon of short circuit between the solder strip 103 and the fine grid can be avoided. In addition, along the extension direction of the solder strip 103, there are at least two pads (not shown in the figure) in contact with the solder strip 103. The solder strip 103 is raised by the first insulating glue 112, which is conducive to reducing the height difference between the part of the solder strip 103 in contact with the first insulating glue 112 and the part of the solder strip 103 in contact with the pad, thereby effectively reducing the bending degree of the solder strip 103 itself.

[0127] It should be noted that Figure 14It is emphasized that the extending direction of the solder rib 103 and the extending direction of the second insulating glue 122 are the same, both of which are the first direction X. In other words, in the extending direction of the solder rib 103, the thickness of the second insulating glue 122 in the second direction Y is gradually increased, and the closer to the center of the cell sheet 100, the greater the thickness of the second insulating glue 122 in the second direction Y. In this way, the thickness of the second insulating glue 122 far from the edge of the cell sheet 100 in the second direction Y is gradually increased, for example, gradually increased to the same as the thickness of the solder pad 113 in the second direction Y, that is, the top surface of the second insulating glue 122 at the maximum thickness is in the same plane as the top surface of the solder pad 113, which is beneficial to make the solder rib 103 on the cell sheet 100 be supported by the solder pad 113 and the second insulating glue 122 together, to provide more support points for the solder rib 103 in the same plane, to avoid the deformation of the solder rib 103 caused by the height difference of the support points, that is, to reduce the bending degree of the solder rib 103 itself.

[0128] In some embodiments, the second insulating glue 122 is provided on the cell sheet 100 by a second screen printing process. Figure 16 , Figure 16 In some embodiments, the second insulating glue 122 is provided on the cell sheet 100 by a second screen printing process.

[0129] It is emphasized that the extending direction of the solder rib 103 and the extending direction of the second insulating glue 122 are the same, both of which are the first direction X. In other words, in the extending direction of the solder rib 103, the thickness of the second insulating glue 122 in the second direction Y is gradually increased, and the closer to the center of the cell sheet 100, the greater the thickness of the second insulating glue 122 in the second direction Y. In this way, the thickness of the second insulating glue 122 far from the edge of the cell sheet 100 in the second direction Y is gradually increased, for example, gradually increased to the same as the thickness of the solder pad 113 in the second direction Y, that is, the top surface of the second insulating glue 122 at the maximum thickness is in the same plane as the top surface of the solder pad 113, which is beneficial to make the solder rib 103 on the cell sheet 100 be supported by the solder pad 113 and the second insulating glue 122 together, to provide more support points for the solder rib 103 in the same plane, to avoid the deformation of the solder rib 103 caused by the height difference of the support points, that is, to reduce the bending degree of the solder rib 103 itself.

[0130] It should be noted that the battery piece 100 includes but is not limited to one or any combination of a PERC battery (Passivated Emitter Rear Cell), an IBC battery (Interdigitated Back Contact), a TOPCon battery (Tunnel Oxide Passivated Contact), and a HIT / HJT battery (Heterojunction Technology).

[0131] In some cases, the same battery piece 100 has opposite first edge regions 140 and second edge regions 150 on opposite sides in the second direction Y, and the opposite sides of the same battery piece 100 are the front and back of the battery piece 100, and the front and back of the battery piece 100 are provided with grid lines, and the same solder strip 103 is electrically connected to the grid lines on the front of one of the adjacent two battery pieces 100 and the grid lines on the back of the other. Based on this, at least two second insulating adhesives 122 spaced apart in the third direction Z are formed on the first edge region 140 and the second edge region 150 of the front and back of the battery piece 100. A single solder strip 103 abuts against two second insulating adhesives 122 on the first edge region 140 and the second edge region 150 of the front of one battery piece 100, and also abuts against two second insulating adhesives 122 on the first edge region 140 and the second edge region 150 of the back of the other battery piece 100, which is beneficial to gradually slow down the process of bending the solder strip 103 when the solder strip 103 is bent from the front to the back, by virtue of the feature that the thickness of the second insulating adhesive 122 in the second direction Y is thinner closer to the edge of the battery piece 100, to reduce the degree of bending of the solder strip 103, thereby avoiding that the solder strip 103 at the edge causes greater pressure on the battery piece 100, to reduce the risk of the battery piece 100 breaking.

[0132] In other cases, the battery piece 100 is a back contact battery piece, and only the back of the battery piece 100 has opposite first edge regions 140 and second edge regions 150 on opposite sides in the second direction Y. In a photovoltaic module, the solder strip 103 led out from part of the battery piece 100 will be subsequently electrically connected to a busbar (not shown in the figure). In the design of hiding the busbar, part of the solder strip 103 will be bent from the back to the front of the battery piece 100. Based on this, the insulating adhesive on the first edge region 140 and the second edge region 150 that abuts against the part of the solder strip 103 is designed as a second insulating adhesive 122, which is beneficial to reduce the overall thickness of the solder strip 103 bending region, to further avoid that the solder strip 103 at the edge causes greater pressure on the battery piece 100, to reduce the risk of the battery piece 100 breaking.

[0133] In some cases, with continued reference to Figure 16 At least one of the opposite sides of the battery piece 100 in the second direction Y also has a center region 160 between the first edge region 140 and the second edge region 150, and a plurality of spaced-apart pads 113 are disposed on the center region 160. The solder ribbon 103 also electrically contacts at least two pads 113 spaced apart along the first direction X.

[0134] In summary, a new type of screen 101 is provided, by means of which the thickness of the insulating adhesive 102 can be tapered according to preset requirements. For example, the first insulating adhesive 112 having a thickness gradually increasing and then gradually decreasing in the second direction Y can be formed by using the first screen 111, and / or the second insulating adhesive 122 having a thickness gradually increasing in the second direction Y can be formed by using the second screen 121. Whether the thickness of the insulating adhesive 102 in the second direction Y is tapered like the first insulating adhesive 112 or like the second insulating adhesive 122, it is beneficial to match the solder ribbon formed subsequently by using the thinning feature of the thickness of at least one edge of the insulating adhesive 102 in the second direction Y, so as to reduce the height difference between at least part of the solder ribbon and the battery piece 100, to reduce the bending degree of the solder ribbon itself, to reduce the stress caused by the solder ribbon to the battery piece 100, and to reduce the risk of the battery piece 100 breaking. In addition, the reduction of the bending degree of the solder ribbon itself can also improve the service life of the solder ribbon to some extent. Moreover, the amount of the insulating adhesive 102 required for preparation can be reduced by means of the screen 101, thereby being beneficial to reducing the preparation cost of the photovoltaic module.

[0135] Another embodiment of the present disclosure also provides a photovoltaic module formed by the preparation method of the photovoltaic module provided by the foregoing embodiments. The photovoltaic module provided by another embodiment of the present disclosure will be described in detail below in combination with the accompanying drawings. It should be noted that the same or corresponding parts as the foregoing embodiments will not be described herein.

[0136] With reference to Figures 2 to 16 The photovoltaic module comprises a photovoltaic module formed by the preparation method of the photovoltaic module provided by the foregoing embodiments.

[0137] In some embodiments, with reference to Figures 2 to 16 , and Figure 17 and Figure 18The photovoltaic module can include: a cell string formed by the method for manufacturing a photovoltaic module provided by the foregoing embodiments; an encapsulant film 41 for covering the surface of the cell string; and a cover plate 42 for covering the surface of the encapsulant film 41 away from the cell string. The cell pieces 100 are electrically connected in a whole piece or multiple pieces to form a plurality of cell strings, and the plurality of cell strings are electrically connected in series and / or parallel. The cell piece 100 can be a whole piece cell or a sliced cell, and the sliced cell refers to a cell formed by cutting a whole piece cell.

[0138] wherein, Figure 17 a partial perspective structure diagram of a photovoltaic module provided by another embodiment of the present disclosure, Figure 18 as Figure 17 a partial cross-sectional structure diagram along a first cross-sectional direction AA1.

[0139] In some embodiments, referring to Figure 17 and Figure 18 The plurality of cell pieces 100 can be electrically connected by a solder strip 103. Figure 17 and Figure 18 Only a positional relationship between cell pieces 100 is shown, and the cell pieces 100 can also be arranged according to the grid lines of different polarities toward the same side, that is, the grid lines of the adjacent plurality of cell pieces 100 are sequentially arranged in the order of the first polarity, the second polarity, and the first polarity, and the solder strip 103 connects the same side of two adjacent cell pieces 100. In other embodiments, the cell pieces have the same arrangement direction of the electrodes of the same polarity, or each cell piece has the electrodes of the positive polarity arranged toward the same side, so that the solder strips connect different sides of two adjacent cell pieces.

[0140] In some embodiments, the encapsulation film 41 comprises a first encapsulation layer covering one of the front side or the back side of the cell sheet 100, and a second encapsulation layer covering the other of the front side or the back side of the cell sheet 100. Specifically, at least one of the first encapsulation layer or the second encapsulation layer can be an organic encapsulation film such as a polyvinyl butyral (PVB) film, an ethylene-vinyl acetate copolymer (EVA) film, a polyolefin elastomer (POE) film, or a polyethylene terephthalate (PET) film, or at least one of the first encapsulation layer or the second encapsulation layer can also be an EP film, an EPE film, or a PVP film. The EP film refers to a co-extrusion film formed by stacking an EVA film and a POE film, the EPE film refers to a co-extrusion film formed by stacking an EVA film, a POE film, and an EVA film in sequence, and the PVP film refers to a co-extrusion film formed by stacking a POE film, an EVA film, and a POE film in sequence. The co-extrusion film can be prepared by extruding one or more raw materials onto another film that has been prepared, or by bonding different types of films to each other during film processing.

[0141] In some cases, the first encapsulation layer and the second encapsulation layer have a boundary before lamination, and after lamination, the photovoltaic module is formed without the concept of the first encapsulation layer and the second encapsulation layer, i.e., the first encapsulation layer and the second encapsulation layer have formed an integral encapsulation film 41.

[0142] In some embodiments, the cover plate 42 can be a glass cover plate, a plastic cover plate, or the like, which has a light-transmitting function. Specifically, the surface of the cover plate 42 facing the encapsulation film 41 can be a concave-convex surface or a suede surface comprising a plurality of convex structures, thereby increasing the utilization rate of incident light. The cover plate 42 comprises a first cover plate opposite the first encapsulation layer and a second cover plate opposite the second encapsulation layer.

[0143] In some cases, when the cell sheet 100 is a cell sheet with main grids, the surface of the cell sheet 100 has a plurality of main grids spaced apart in a fourth direction and a plurality of sub-grids spaced apart in a fifth direction, and the main grid comprises a main grid connecting line and a solder pad on the main grid connecting line. In the process of constructing a cell string using the cell sheet 100, the solder strip 103 is electrically connected to at least one main grid on each of the two adjacent cell sheets 100.

[0144] In some other cases, in the case that the battery piece 100 is a main grid-free battery, the surface of the battery piece 100 has a plurality of sub-grids arranged at intervals along the fifth direction, and in the process of constructing the battery string by using the battery piece 100, the welding strip 103 is electrically connected with the plurality of sub-grids on each of the two adjacent battery pieces 100 respectively.

[0145] Those skilled in the art can understand that the above-mentioned embodiments are specific embodiments for implementing the present disclosure, and in actual application, various changes can be made in form and details without departing from the spirit and scope of the embodiments of the present disclosure. Any person skilled in the art can make various modifications and modifications without departing from the spirit and scope of the embodiments of the present disclosure, and therefore the protection scope of the embodiments of the present disclosure should be subject to the scope defined by the claims.

Claims

1. A method of making a photovoltaic module, characterized by, The method comprises: providing a battery piece; providing a screen plate to form an insulating glue on the battery piece; the step of providing the screen plate to form the insulating glue comprises: providing a first screen plate to form a first insulating glue on the battery piece, wherein, along a first direction, the thickness of the first screen plate in a second direction gradually decreases first and then gradually increases, and the side of the first screen plate facing the battery piece is recessed away from the battery piece; or, along the first direction, the thickness of the first screen plate in the second direction gradually increases first and then gradually decreases, and the side of the first screen plate away from the battery piece is convex away from the battery piece; the thickness of the first insulating glue in the second direction gradually increases first and then gradually decreases; and / or, providing a second screen plate to form a second insulating glue on the battery piece, wherein, along the first direction, the thickness of the second screen plate in the second direction gradually decreases, and the side of the second screen plate facing the battery piece is recessed away from the battery piece; or, along the first direction, the thickness of the second screen plate in the second direction gradually increases, and the side of the second screen plate away from the battery piece is convex away from the battery piece; the thickness of the second insulating glue in the second direction gradually increases; the first direction is the length direction of the insulating glue, and the second direction is the thickness direction of the battery piece.

2. The production method according to claim 1, characterized by, Along the first direction, the length of the screen plate is less than the length of the insulating glue.

3. The preparation method according to claim 1, characterized in that, Along the first direction, the thickness of the thinnest part of the screen plate is 12-18 μm, and the thickness of the thickest part of the screen plate is 105-115 μm.

4. The production method according to any one of claims 1 to 3, characterized by, A plane perpendicular to the first direction is taken as a reference section; in the provided first screen plate, along the first direction, the cross-sectional area of the first screen plate on the reference section gradually decreases first and then gradually increases, and the side of the first screen plate facing the battery piece is a curved surface or two intersecting inclined surfaces, and the side of the first screen plate away from the battery piece is a plane; and / or, in the provided second screen plate, along the first direction, the cross-sectional area of the second screen plate on the reference section gradually decreases, and the side of the second screen plate facing the battery piece is a curved surface or an inclined surface, and the side of the second screen plate away from the battery piece is a plane.

5. The production method according to any one of claims 1 to 3, characterized by, A plane perpendicular to the first direction is taken as a reference section; in the provided first screen plate, along the first direction, the cross-sectional area of the first screen plate on the reference section gradually increases first and then gradually decreases, and the side of the first screen plate away from the battery piece is two intersecting inclined surfaces or two intersecting curved surfaces, and the side of the first screen plate facing the battery piece is a plane; and / or, in the provided second screen plate, along the first direction, the cross-sectional area of the second screen plate on the reference section gradually increases, and the side of the second screen plate away from the battery piece is an inclined surface or a curved surface, and the side of the second screen plate facing the battery piece is a plane.

6. The production method according to any one of claims 1 to 3, characterized by, A plane perpendicular to the first direction is taken as a reference section; The first screen is provided, wherein, along the first direction, the cross-sectional area of the first screen on the reference cross-section gradually decreases first and then gradually increases, the first screen is recessed towards the side of the battery piece away from the battery piece, and the side of the first screen away from the battery piece is recessed towards the battery piece. The second screen is provided, wherein, along the first direction, the cross-sectional area of the second screen on the reference cross-section gradually decreases, the second screen is recessed towards the side of the battery piece away from the battery piece, and the side of the second screen away from the battery piece is recessed towards the battery piece.

7. The production method according to any one of claims 1 to 3, characterized by, The battery piece is provided, wherein the back surface of the back contact battery piece is provided with first fine grids and second fine grids arranged alternately. The first screen is provided to form the first insulating glue on the battery piece, and the first insulating glue is arranged along the first direction. After the first screen is provided to form the first insulating glue on the battery piece, the preparation method further comprises: forming a plurality of welding strips arranged at intervals along the first direction, in the same welding strip, the welding strip is electrically connected with one of the first fine grid and the second fine grid, the welding strip is electrically insulated from the other one of the first fine grid and the second fine grid, and the welding strip is located between or abuts against at least one of the adjacent two first insulating glues.

8. The production method according to any one of claims 1 to 3, characterized by, The battery piece is provided, wherein the back surface of the back contact battery piece is provided with first fine grids and second fine grids arranged alternately. The first screen is provided to form the first insulating glue on the battery piece, and the first insulating glue is arranged along the first direction. After the first screen is provided to form the first insulating glue on the battery piece, the preparation method further comprises: forming a plurality of welding strips arranged at intervals along the first direction, in the same welding strip, the welding strip is electrically connected with one of the first fine grid and the second fine grid, the welding strip is electrically insulated from the other one of the first fine grid and the second fine grid, and the welding strip is located between or abuts against at least one of the adjacent two first insulating glues.

9. The production method according to any one of claims 1 to 3, characterized by, The battery piece is provided, wherein, along the first direction, at least one of the opposite sides of the battery piece in the second direction has opposite first edge regions and second edge regions. The second screen is provided to form the second insulating glue on the battery piece, and at least two second insulating glues arranged at intervals along a third direction are formed on the first edge region and the second edge region, and the third direction is the width direction of the second insulating glue. After the first screen is provided to form the first insulating paste on the battery piece, the preparation method further comprises: forming a plurality of welding strips arranged at intervals along the third direction, and in the same welding strip, the welding strip is in abutment with one of the second insulating pastes located on the first edge area, and in abutment with one of the second insulating pastes located on the second edge area.

10. A photovoltaic module, characterized by Comprising: A photovoltaic module formed via the method of preparing a photovoltaic module according to any one of claims 1 to 9.

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