Photovoltaic module

Abstract

The invention relates to a photovoltaic module, the photovoltaic module comprises a confluence component and a plurality of battery strings connected through the confluence component, and each battery string comprises a plurality of battery pieces connected through a welding strip. Wherein the bus component comprises a positive bus bar, a negative bus bar and an insulating body, the positive bus bar and the negative bus bar are embedded into the insulating body at intervals, the insulating body comprises an opening part, and part of structures of the positive bus bar and the negative bus bar are exposed through the opening part; and the positive bus bar and the negative bus bar are used for being electrically connected with the welding strip. The positive bus bar and the negative bus bar are integrated into the integrated bus component through the insulating body, so that the sectional areas of the positive bus bar and the negative bus bar are reduced, the area of the positive bus bar and the negative bus bar arranged on the battery piece is reduced, the space utilization rate of the photovoltaic module is improved, and the waste of materials is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaics, in particular to a photovoltaic component. Background Art

[0002] The battery module of a photovoltaic module includes multiple battery strings, and each battery string is connected by a bus bar and an interconnection welding strip. The bus bar is generally located at both ends of the battery string, and the interconnection welding strip is located at both ends of the battery string and welded to the bus bar. Among them, the bus bar is generally a tinned copper flat strip with a larger cross-sectional area. Since the current that the bus bar needs to carry is much larger than the interconnection welding strip, the cross-sectional area of ​​the bus bar is often larger, which increases the occupancy rate of the photovoltaic module area and causes a certain waste of solar cell module materials. Summary of the invention

[0003] The present application provides a photovoltaic module, which is used to solve the problem that the busbar occupies a large area of ​​the photovoltaic module, causing a certain amount of waste in the materials of the photovoltaic module.

[0004] The present application provides a photovoltaic assembly, the photovoltaic assembly comprising a busbar component and a plurality of battery strings connected by the busbar component, the battery string comprising a plurality of battery sheets electrically connected by welding strips; Among them, the bus component includes a positive bus bar, a negative bus bar and an insulating body, the positive bus bar and the negative bus bar are embedded in the insulating body at intervals, and the insulating body includes an opening portion, and partial structures of the positive bus bar and the negative bus bar are exposed through the opening portion so that the positive bus bar and the negative bus bar are used to be electrically connected to the welding strip.

[0005] In this solution, the positive bus bar and the negative bus bar are integrated into an integrated bus component through an insulating body, which reduces the cross-sectional area of ​​the positive bus bar and the negative bus bar, and is beneficial to reducing the area where the positive bus bar and the negative bus bar are set on the battery cell, thereby facilitating the improvement of the space utilization rate of the photovoltaic module and reducing the waste of materials.

[0006] At the same time, the positive busbar and the negative busbar are embedded in the insulating body at intervals, and part of the structure of the positive busbar and the negative busbar is exposed through the opening, so that part of the structure of the positive busbar and the negative busbar is electrically connected to the welding strip. Therefore, the insulating body is used to fix and space the positive busbar and the negative busbar, reducing the risk of short circuit, and the insulating body can be used to shield the part of the structure of the positive busbar and the negative busbar that is not used for electrical connection with the welding strip, further reducing the risk of short circuit when the positive busbar and the negative busbar of the part of the structure are electrically connected to the welding strip.

[0007] In this solution, the positive bus bar includes a first welding portion and a first body, the first welding portion is bent relative to the first body, or the first welding portion is protruding relative to the first body; The negative electrode bus bar includes a second welding portion and a second body, wherein the second welding portion is bent relative to the second body, or the second welding portion is protruded relative to the second body.

[0008] In this solution, the positive bus bar and the negative bus bar are spaced apart from each other along the width direction of the bus component, and the opening is located on the same side of the insulating body along the thickness direction.

[0009] In this solution, the positive bus bar and the negative bus bar are spaced apart along the thickness direction of the bus component, and the insulating body is provided with a first opening on one side along the thickness direction and a second opening on the other side, and the positive bus bar and the negative bus bar are exposed through the first opening and the second opening respectively; Projections of the first opening and the second opening along a thickness direction of the flow collecting member do not overlap.

[0010] In this solution, along the thickness direction of the current collecting component, the thickness M of the insulating body satisfies 0.1 mm≤M≤6 mm.

[0011] In this solution, along the thickness direction of the busbar, the thickness K of the positive busbar and the negative busbar satisfies 0.01mm≤K≤5mm, and along the width direction of the busbar, the width N1 of the positive busbar and the negative busbar satisfies 1mm≤N1≤50mm; There is a gap S between the positive electrode bus bar and the negative electrode bus bar, which satisfies 1 mm ≤ S ≤ 2 mm.

[0012] In this solution, the opening is a hollow structure arranged on the surface of the insulating body; Along the width direction of the busbar component, the width of the opening is N2, and the width N1 of the positive busbar and the negative busbar is equal to the width N2 of the opening.

[0013] In this solution, the opening portion is a groove structure, and the opening portion passes through two side walls of the insulating body along the width direction of the current collecting component.

[0014] In this solution, the diameter of the welding strip is d, the length of the opening along the length direction of the runner component is L, and the depth of the opening along the thickness direction of the runner component is H, satisfying: 1.5×d≤L≤2×d, and / or, 0.5×d≤H≤d.

[0015] In this solution, the busbar component is located on the back side of the battery cell, and at least a portion of the structure of the busbar component and at least a portion of the structure of the battery cell are stacked along the thickness direction of the busbar component.

[0016] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a photovoltaic module provided in this application in a specific embodiment; Figure 2 A schematic diagram of the structure of the connection between the busbar component and the battery string provided in the present application in a specific embodiment; Figure 3 A schematic diagram of the structure of the connection method of the cells in the photovoltaic module provided in the present application in a specific embodiment; Figure 4 A schematic diagram of the structure of the connection between the busbar component and the welding strip provided in the present application in a specific embodiment; Figure 5 A schematic diagram of the structure of a confluence component provided in the present application in a specific embodiment; Figure 6 A schematic structural diagram of a confluence component provided in the present application in another specific embodiment; Figure 7 A schematic structural diagram of a confluence component provided in the present application in another specific embodiment; Figure 8 A schematic structural diagram of a confluence component provided in the present application in another specific embodiment; Fig. 9 A schematic structural diagram of a confluence component provided in the present application in another specific embodiment; Fig.10 A cross-sectional view of a photovoltaic module provided in the present application in a specific embodiment; Fig.11 for Figure 1 A cross-sectional view of a portion of the structure of a photovoltaic module provided in; Fig.12 A cross-sectional view of a confluence component provided in the present application in a specific embodiment; Fig.13 A cross-sectional view of a confluence component provided in the present application in a specific embodiment; Fig.14 A cross-sectional view of a confluence component provided by the present application in another perspective in a specific embodiment; Fig.15 A cross-sectional view of a busbar component provided in the present application from another perspective in a specific embodiment.

[0018] Description of reference numerals: 1-Confluence components; 11-insulating body; 111- opening; 111a-first opening; 111b- second opening; 12- positive bus bar; 121a-first welding portion; 121b- first body; 13- negative bus bar; 131a- second welding portion; 131b- Second body; 14- buffer layer; 2- Photovoltaic modules; 21- welding strip; 22-Battery cell.

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0020] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0021] In a specific embodiment, the present application is further described in detail below through a specific embodiment and in conjunction with the accompanying drawings.

[0022] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0023] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0024] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0025] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0026] The present application embodiment provides a photovoltaic assembly 2, such as Figure 1 , Figure 2 and Figure 4 As shown, the photovoltaic assembly 2 includes a busbar component 1 and a plurality of battery strings connected by the busbar component 1 , and the battery string includes a plurality of battery cells 22 electrically connected by welding strips 21 .

[0027] Among them, the bus component 1 includes a positive bus bar 12, a negative bus bar 13 and an insulating body 11, the positive bus bar 12 and the negative bus bar 13 are embedded in the insulating body 11 at intervals, and the insulating body 11 includes an opening portion 111, and part of the structure of the positive bus bar 12 and the negative bus bar 13 is exposed through the opening portion 111, so that the positive bus bar 12 and the negative bus bar 13 are used to be electrically connected to the welding strip 21.

[0028] In this example, the positive bus bar 12 and the negative bus bar 13 are integrated into a bus component 1 through an insulating body 11, which reduces the cross-sectional area of ​​the positive bus bar 12 and the negative bus bar 13, and is beneficial to reducing the area where the positive bus bar 12 and the negative bus bar 13 are arranged on the battery cell 22, thereby facilitating the improvement of the space utilization of the photovoltaic module 2 and reducing the waste of materials.

[0029] At the same time, the positive bus bar 12 and the negative bus bar 13 are embedded in the insulating body 11 at intervals, and partial structures of the positive bus bar 12 and the negative bus bar 13 are exposed through the opening 111, so that partial structures of the positive bus bar 12 and the negative bus bar 13 are electrically connected to the welding strip 21. Therefore, the insulating body 11 is used to fix and space the positive bus bar 12 and the negative bus bar 13, reducing the risk of short circuit, and the insulating body 11 can be used to shield the partial structure of the positive bus bar 12 and the negative bus bar that is not used for electrical connection with the welding strip 21, further reducing the risk of short circuit when the positive bus bar 12 and the negative bus bar of the partial structure are electrically connected to the welding strip 21.

[0030] The positive electrode bus bar 12 and the negative electrode bus bar 13 are made of copper foil and tin material.

[0031] In addition, if Figure 1 and Fig.11As shown, the welding strip 21 can be bent relative to the battery and electrically connected to the battery sheet 22, so that the photovoltaic module 2 can be compatible with different types of batteries, thereby improving the adaptability of the photovoltaic module 2. At the same time, the busbar component 1 is provided with an opening 111 for electrically connecting to the welding strip 21, so that the busbar component 1 can be compatible with various batteries such as PERC batteries (Passivated Emitter and Rear Cell), TOPCon batteries (Tunnel Oxide Passivated Contact), HJT batteries (Heterojunction with Intrinsic Thin-layer), and IBC batteries (Interdigitated Back Contact).

[0032] In a possible implementation, Figure 1 and Fig.10 As shown, the busbar component 1 is located on the back side of the battery cell 22 , and at least a portion of the structure of the busbar component 1 and at least a portion of the structure of the battery cell 22 are stacked along the thickness direction of the busbar component 1 .

[0033] Compared with the traditional photovoltaic modules, since the thickness of the traditional busbar is relatively thin, the busbar is usually arranged between the cells or between the cells and the frame to reduce the risk of busbar breakage during the lamination process of the photovoltaic module. However, the traditional busbar is arranged between the cells or between the cells and the frame, which greatly increases the distance between the cells or the distance from the cells to the frame, thereby increasing the blank area. Therefore, in this embodiment, the busbar component 1 is located on the back of the cell 22, and at least part of the structure of the busbar component 1 and at least part of the structure of the cell 22 are stacked along the thickness direction of the busbar component 1, which is conducive to reducing the blank area, and then is conducive to improving the space utilization of the photovoltaic module 2. In addition, since the positive busbar 12 and the negative busbar 13 are both embedded in the insulating body 11, it is conducive to reducing the risk of busbar 1 breaking during the lamination process of the photovoltaic module 2, and improving the structural stability and reliability of the photovoltaic module 2. For example, the spacing between conventional cells 22 is generally more than 10 mm, and the spacing between the cells 22 of the photovoltaic module 2 provided in the embodiment of the present application can be reduced to 1 mm or less.

[0034] In addition, in a possible implementation manner, Figure 2As shown, since the bus component 1 integrates the positive bus bar 12 and the negative bus bar 13, the photovoltaic module 2 can be provided with only one bus component 1 to output current, that is, the total positive and total negative of the photovoltaic module 2 can be located at the same end of the battery cell 22. Therefore, the bus component 1 can be arranged at one end of the battery cell 22, which is beneficial to further reduce the space occupied by the positive bus bar 12 and the negative bus bar 13 in the photovoltaic module 2, and reduce the material consumption in the photovoltaic module 2.

[0035] In addition, if Figure 2 and Figure 3 As shown, since the busbar components 1 are provided with positive busbars 12 and negative busbars 13, and the positive busbars and negative busbars 13 are insulated and isolated by the insulating body 11, the embodiment of the present application can electrically connect the positive poles of the first column of battery cells 22, the positive poles of the third column of battery cells 22, and the positive poles of the fifth column of battery cells 22, that is, skip the negative poles of the second column of battery cells 22 and the negative poles of the fourth column of battery cells 22. The photovoltaic module 2 can arbitrarily skip the electrical connection of several columns of battery cells 22 of the same polarity according to actual connection requirements, and electrically connect several other columns of the same polarity, thereby reducing the risk of jumper connection restrictions of the photovoltaic module 2, reducing the wiring cost, and reducing the risk of faults during the wiring process, thereby improving the reliability of the operation of the photovoltaic module 2.

[0036] In a possible implementation, Figure 4 , Fig.14 and Fig.15 As shown, the positive bus bar 12 includes a first welding portion 121a and a first body 121b. The first welding portion 121a is bent relative to the first body 121b, or the first welding portion 121a is protruded relative to the first body 121b.

[0037] The negative electrode bus bar 13 includes a second welding portion 131 a and a second body 131 b . The second welding portion 131 a is bent relative to the second body 131 b , or the second welding portion 131 a is protruded relative to the second body 131 b .

[0038] In this embodiment, the first welding portion 121a is raised or bent relative to the first body 121b, so that the first welding portion 121a can be exposed to the surface of the insulating body 11, so that the positive bus bar 12 is welded to the welding strip 21 through the first welding portion 121a. Similarly, the second welding portion 131a is raised or bent relative to the second body 131b, so that the second welding portion 131a can be exposed to the surface of the insulating body 11, so that the negative bus bar 13 is welded to the welding strip 21 through the second welding portion 131a. Therefore, the first welding portion 121a is raised or bent relative to the first body 121b, and the second welding portion 131a is raised or bent relative to the second body 131b, so that the positive bus bar 12 and the negative bus bar 13 can be welded to the welding strip 21, thereby improving the convenience of welding. In addition, the first welding portion 121a and the second welding portion 131a are exposed through the surface of the insulating body 11, so that the first welding portion 121a and the second welding portion 131a can be in the same horizontal plane with the surface of the insulating body 11, which is beneficial to increase the welding area of ​​the positive bus bar 12 and the negative bus bar 13 and the welding strip 21, and further beneficial to improve the firmness and stability of the welding of the positive bus bar 12 and the negative bus bar 13 and the welding strip 21.

[0039] In addition, a welding material layer is coated on the first welding portion 121a and the second welding portion 131a or a welding material layer is filled in the opening portion 111, so that the positive bus bar 12 is welded to the welding strip 21 through the first welding portion 121a exposed through the opening portion 111, and the negative bus bar 13 is welded to the welding strip 21 through the second welding portion 131a exposed through the opening portion 111.

[0040] In a possible implementation, Figure 4-Figure 6 As shown, the positive bus bar 12 and the negative bus bar 13 are spaced apart along the width direction of the busbar component 1, and the opening 111 is located on the same side of the insulating body 11 along the thickness direction, which is beneficial to reducing the size of the busbar component 1 along its thickness direction and the space occupied by the busbar component 1 in the photovoltaic module 2 along the thickness direction.

[0041] In addition, if Figure 4 and Fig.14 , Fig.15 As shown, the opening 111 for exposing the first welding portion 121a and the opening for exposing the second welding portion 131a are staggered along the length direction of the busbar component 1 to improve the feasibility of independently welding the welding strip 21 to the first welding portion 121a and the second welding portion 131a.

[0042] in, Figure 4 and Figure 5 The busbar component 1 shown can be applied to BC batteries (Back Contact or full back electrode batteries). Figure 6The busbar component 1 shown can be suitable for a TopCon cell (Tunnel Oxide Passivated Contact cell).

[0043] In another possible implementation, Figure 7-Figure 9 As shown, the positive bus bar 12 and the negative bus bar 13 are spaced apart along the thickness direction of the busbar component 1, and a first opening portion 111a is provided on one side of the insulating body 11 along the thickness direction, and a second opening portion 111b is provided on the other side. The positive bus bar 12 and the negative bus bar 13 are exposed through the first opening portion 111a and the second opening portion 111b respectively, which is beneficial to reducing the size of the busbar component 1 along its width direction and reducing the space occupied by the busbar component 1 along the width direction of the photovoltaic module 2.

[0044] In addition, the positive bus bar 12 and the negative bus bar 13 are exposed through the first opening 111a and the second opening 111b located on different sides of the insulating body 11, respectively, so that operators can easily distinguish the positive bus bar 12 and the negative bus bar 13, thereby improving the efficiency of optical welding and further improving the production efficiency of the photovoltaic module 2.

[0045] In a possible implementation, Figure 7-Figure 9 As shown, the projections of the first opening portion 111a and the second opening portion 111b along the thickness direction of the busbar 1 do not overlap, that is, the first opening portion 111a and the second opening portion 111b are staggered along the length direction of the busbar 1, which further facilitates the operator to easily distinguish the positive busbar 12 and the negative busbar 13. At the same time, it is beneficial to reduce the risk of short circuit caused by the intersection of the welding strip 21 welded to the positive busbar 12 and the welding strip 21 welded to the negative busbar 13, thereby improving the safety of the photovoltaic module 2.

[0046] in, Figure 7 and Figure 8 The busbar component 1 shown can be applied to BC batteries (Back Contact or full back electrode batteries). Fig. 9 The busbar component 1 shown can be suitable for a TopCon cell (Tunnel Oxide Passivated Contact cell).

[0047] In a possible implementation, Figure 4As shown, along the thickness direction of the busbar component 1, the thickness M of the insulating body 11 satisfies 0.1mm≤M≤6mm. In some embodiments, the thickness M of the insulating body 11 can be 0.1mm, 0.2mm, 0.4mm, 0.5mm, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.5mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.5mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.4mm, 3.5mm, 3.6mm, 3.8mm, 4mm, 4.2mm, 4.4mm, 4.5mm, 4.6mm, 4.8mm, 5mm, 5.2mm, 5.4mm, 5.5mm, 5.6mm, 5.8mm, 6mm, etc.

[0048] When the thickness M of the insulating body 11 is too small, it is easy to cause the thickness of the insulating body 11 to be too small, and there is a risk of the insulating body 11 being broken down by a large voltage, and the risk of the busbar component 1 breaking during the lamination process of the photovoltaic module 2, which reduces the structural stability of the busbar component 1 and the safety of the use of the photovoltaic module 2; when the thickness M of the insulating body 11 is too large, it is easy to cause the thickness of the insulating body 11 to be too large, greatly increasing the size of the busbar component 1 along the thickness direction, thereby increasing the space occupied by the photovoltaic module 2 and causing material waste.

[0049] Therefore, the thickness M of the insulating body 11 satisfies 0.1mm≤M≤6mm, which can make the collector component 1 have good structural stability and meet the safety requirements of the photovoltaic component 2 without causing the risk of occupying too much space of the photovoltaic component 2, and is conducive to reducing material waste.

[0050] In a possible implementation, Fig.12 and Fig.13 As shown, along the thickness direction of the busbar 1, the thickness K of the positive busbar 12 and the negative busbar 13 satisfies 0.01mm≤K≤5mm, and along the width direction of the busbar 1, the width N1 of the positive busbar 12 and the negative busbar 13 satisfies 1mm≤N1≤50mm. In some embodiments, the thickness K of the positive busbar 12 and the negative busbar 13 can be 0.01mm, 0.05mm, 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc. The width N1 of the positive busbar 12 and the negative busbar 13 can be 1mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, etc.

[0051] When the thickness K of the positive busbar 12 and the negative busbar 13 is too small, that is, the positive busbar 12 and the negative busbar 13 are too thin, there is a risk of the first welding portion 121a and the second welding portion 131a being broken during the welding process between the first welding portion 121a and the second welding portion 131a and the welding strip 21, which increases the difficulty of welding the welding strip 21 with the first welding portion 121a and the second welding portion 131a, and at the same time increases the resistance of the positive busbar 12 and the negative busbar 13, reducing the light conversion efficiency of the photovoltaic module 2. When the thickness K of the positive busbar 12 and the negative busbar 13 is too large, that is, the positive busbar 12 and the negative busbar 13 are too thick, the size of the busbar 1 along the thickness direction is increased, resulting in material waste.

[0052] Therefore, the thickness K of the positive bus bar 12 and the negative bus bar 13 satisfies 0.01mm≤K≤5mm, which improves the convenience and firmness of welding the positive bus bar 12 and the negative bus bar 13 to the welding strip 21, and enables the photovoltaic module 2 to have good light conversion efficiency without causing material waste.

[0053] In addition, when the width N1 of the positive bus bar 12 and the negative bus bar 13 is too small, the area of ​​the first welding portion 121a and the second welding portion 131a is greatly reduced, which may easily lead to the risk of poor welding between the positive bus bar 12, the negative bus bar 13 and the welding strip 21, and increase the resistance of the positive bus bar 12 and the negative bus bar 13, resulting in limited current carrying capacity of the positive bus bar 12 and the negative bus bar 13; when the width N1 of the positive bus bar 12 and the negative bus bar 13 is too large, the size of the busbar component 1 along the width direction is increased, resulting in the busbar component 1 occupying too much space of the photovoltaic module 2 along the width direction, reducing space utilization and causing material waste.

[0054] Therefore, the width N1 of the positive bus bar 12 and the negative bus bar 13 satisfies 1mm≤N1≤50mm, which improves the firmness and stability of welding the positive bus bar 12 and the negative bus bar 13 to the welding strip 21, and improves the space utilization of the photovoltaic module 2 without causing material waste.

[0055] Among them, the values ​​of the width N1 of the positive bus bar 12 and the negative bus bar 13 and the thickness K of the positive bus bar 12 and the negative bus bar 13 can be balanced according to the current size of the actual photovoltaic module 2, the back shielding requirements of the photovoltaic module 2 and the material.

[0056] In addition, there is a gap S between the positive bus bar 12 and the negative bus bar 13, satisfying 1mm≤S≤2mm. In some specific embodiments, the gap S between the positive bus bar 12 and the negative bus bar 13 can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc.

[0057] In this embodiment, there is a gap S between the positive bus bar 12 and the negative bus bar 13, and the gap is filled with an insulating body 11, which is used to separate the positive bus bar 12 and the negative bus bar 13, reduce the risk of interference between the positive bus bar 12 and the negative bus bar 13, and further reduce the risk of short circuit. When the gap S between the positive bus bar 12 and the negative bus bar 13 is too small, there is a risk of the insulating body 11 located in the gap being broken down, increasing the risk of short circuit in the bus component 1, and reducing the safety performance of the photovoltaic module 2; when the gap S between the positive bus bar 12 and the negative bus bar 13 is too large, there is a risk that the bus component 1 is large in size along the width direction or along the thickness direction, reducing the space utilization rate of the photovoltaic module 2.

[0058] Therefore, there is a gap S between the positive bus bar 12 and the negative bus bar 13, which satisfies 1mm≤S≤2mm, and can effectively isolate the positive bus bar 12 and the negative bus bar 13, improve the electrical safety performance of the photovoltaic module 2, and improve the space utilization of the photovoltaic group without causing material waste.

[0059] In a possible implementation, Figure 4 and Figure 6 As shown, the opening portion 111 is a hollow structure disposed on the surface of the insulating body 11 .

[0060] Along the width direction of the busbar member 1 , the width of the opening 111 is N2 , and the width N1 of the positive electrode busbar 12 and the negative electrode busbar 13 is equal to the width N2 of the opening 111 .

[0061] In this embodiment, the opening 111 is a hollow structure, and the width N1 of the positive bus bar 12 and the negative bus bar 13 is equal to the width N2 of the opening 111, which facilitates the welding strip 21 to align with the first welding portion 121a and the second welding portion 131a for welding, thereby improving the welding efficiency. At the same time, the width N1 of the positive bus bar 12 and the negative bus bar 13 is equal to the width N2 of the opening 111, which is beneficial to reduce the material waste of the positive bus bar 12 and the negative bus bar 13.

[0062] In a possible implementation, Figure 5 , Figure 8 and Fig. 9As shown, the opening 111 is a groove structure, and the opening 111 passes through two side walls of the insulating body 11 along the width direction of the busbar component 1 .

[0063] In this embodiment, the opening portion 111 is a groove structure, so that at least part of the structure of the welding strip 21 can be embedded in the opening portion 111, thereby improving the stability of the connection between the welding strip 21 and the busbar component 1, and allowing the welding strip 21 to be quickly aligned with the first welding portion 121a and the second welding portion 131a for welding.

[0064] In addition, the groove depth of the opening 111 is related to the position of the positive bus bar 12 and the negative bus bar 13 in the insulating body 11. For example, if the positive bus bar 12 and the negative bus bar 13 are symmetrical along the central axis of the insulating body 11, the groove depths of the opening 111 corresponding to the positive bus bar 12 and the negative bus bar 13 are the same. If the position of the positive bus bar 12 is more biased towards the negative bus bar 13 relative to the central axis of the insulating body 11, the groove depth of the opening 111 corresponding to the positive bus bar 12 is deeper. The groove depth of the opening 111 corresponding to the negative bus bar 13 is shallower so that the welding strip 21 can be welded.

[0065] Among them, Figure 7-Figure 9 As shown, the first opening 111a may be a hollow structure or a groove structure, the second opening 111b may be a groove structure or a hollow structure, or the first opening 111a and the second opening 111b may both be groove structures, or, in other embodiments, the first opening 111a and the second opening 111b may both be hollow structures. Whether the opening 111 is a hollow structure or a groove structure may be selected according to the actual layout requirements of the welding strip 21.

[0066] In a possible implementation, Figure 4 As shown, the diameter of the welding strip 21 is d, the length of the opening 111 along the length direction of the busbar component 1 is L, and the depth of the opening 111 along the thickness direction of the busbar component 1 is H, satisfying: 1.5×d≤L≤2×d, and / or, 0.5×d≤H≤d.

[0067] In some embodiments, L / d may be 1.5, 1.6, 1.7, 1.8, 1.9, 2, etc., and / or H / d may be 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc.

[0068] When L / d is too small, that is, the length dimension L of the opening 111 is too small relative to the diameter dimension d of the welding strip 21, the welding area of ​​the first welding portion 121a and the second welding portion 131a exposed through the opening 111 is reduced, the stability of the welding connection is reduced, and the welding difficulty is increased; when L / d is too large, that is, the length dimension L of the opening 111 is too large relative to the diameter dimension d of the welding strip 21, the area of ​​the insulating body 11 is greatly reduced, and there is a risk of short circuit in the current collecting component 1. Therefore, satisfying 1.5×d≤L≤2×d enables the positive bus bar 12 and the negative bus bar 13 to be well welded to the welding strip 21 , and is beneficial to improving the electrical safety performance of the photovoltaic module 2 .

[0069] When H / d is too small, that is, the depth H of the opening 111 is too small relative to the diameter d of the welding strip 21, the stability of the connection between the welding strip 21 and the first welding portion 121a and the second welding portion 131a located in the opening 111 is reduced; when H / d is too large, that is, the depth H of the opening 111 is too large relative to the diameter d of the welding strip 21, there is a risk of causing the insulating body 11 to be too thick along the thickness direction.

[0070] Therefore, 0.5×d≤H≤d is satisfied, so that the welding strip 21 has good connection stability with both the positive bus bar 12 and the negative bus bar 13, and the welding strip 21 is easily positioned, while the size of the insulating body 11 along the thickness direction is moderate.

[0071] In a possible implementation, Fig.12 and Fig.13 As shown, a buffer layer 14 is provided on one side of the busbar component 1 for connecting with the battery cell 22, and the buffer layer 14 is adhesive. The material of the buffer layer 14 is POE (Polyolefin Elastomer) or EVA (Ethylene-Vinyl Acetate copolymer).

[0072] In this embodiment, the buffer layer 14 can reduce the risk of stress between the battery cell 22 and the busbar component 1 causing the battery cell 22 to break, and increase the risk of component damage during the connection process between the busbar component 1 and the battery cell 22. At the same time, the buffer layer 14 is sticky so that the busbar component 1 can be bonded to the back of the battery cell 22.

[0073] In addition, the photovoltaic module 2 further includes an encapsulation film (not shown in the figure), and the buffer layer 14 is cross-linked with the encapsulation film, that is, the buffer layer 14 is integrated with the encapsulation film, or the encapsulation film is arranged on the buffer layer 14. At the same time, the material of the buffer layer 14 is POE or EVA, so that the buffer layer 14 is integrated with the encapsulation film.

[0074] In a possible implementation, Figure 4 , Fig.14 and Fig.15 As shown, the surface of the insulating body 11 is coated with a first coating and a second coating, the first coating and the second coating have different colors, the first coating is located near the first welding portion 121a of the positive bus bar 12, and the second coating is located near the second welding portion 131a of the negative bus bar 13, so as to distinguish the positive bus bar 12 from the negative bus bar 13. For example, Figure 7 In the illustrated embodiment, the surface of one side of the insulating body 11 provided with the first opening 111 a is coated with a first coating, and the surface of one side of the insulating body 11 provided with the second opening 111 b is coated with a second coating.

[0075] The above is only a specific implementation of the embodiment of the present application, but the protection scope of the embodiment of the present application is not limited thereto, and any changes or replacements within the technical scope disclosed in the embodiment of the present application should be included in the protection scope of the embodiment of the present application. Therefore, the protection scope of the embodiment of the present application should be based on the protection scope of the claims.

Claims

1. A photovoltaic module, characterized in that: The photovoltaic assembly (2) comprises a busbar component (1) and a plurality of battery strings connected via the busbar component (1), wherein the battery string comprises a plurality of battery cells (22) electrically connected via a welding ribbon (21); The busbar component (1) comprises a positive busbar (12), a negative busbar (13) and an insulating body (11); the positive busbar (12) and the negative busbar (13) are embedded in the insulating body (11) at intervals; the insulating body (11) comprises an opening (111); partial structures of the positive busbar (12) and the negative busbar (13) are exposed through the opening (111), so that the positive busbar (12) and the negative busbar (13) are used to be electrically connected to the welding strip (21).

2. The photovoltaic module according to claim 1, characterized in that: The positive electrode bus bar (12) comprises a first welding portion (121a) and a first body (121b), wherein the first welding portion (121a) is bent relative to the first body (121b), or the first welding portion (121a) is protruding relative to the first body (121b); The negative electrode bus bar (13) comprises a second welding portion (131a) and a second body (131b), wherein the second welding portion (131a) is bent relative to the second body (131b), or the second welding portion (131a) is protruding relative to the second body (131b).

3. The photovoltaic module according to claim 1, characterized in that: The positive electrode bus bar (12) and the negative electrode bus bar (13) are spaced apart in a width direction of the bus component (1), and the opening (111) is located on the same side of the insulating body (11) in a thickness direction.

4. The photovoltaic module according to claim 1, characterized in that: The positive bus bar (12) and the negative bus bar (13) are spaced apart along the thickness direction of the bus component (1), and the insulating body (11) is provided with a first opening (111a) on one side along the thickness direction and a second opening (111b) on the other side, and the positive bus bar (12) and the negative bus bar (13) are exposed through the first opening (111a) and the second opening (111b) respectively; The projections of the first opening (111a) and the second opening (111b) along the thickness direction of the flow collecting component (1) do not overlap.

5. The photovoltaic module according to any one of claims 1 to 4, characterized in that: Along the thickness direction of the current collecting component (1), the thickness M of the insulating body (11) satisfies 0.1 mm≤M≤6 mm.

6. The photovoltaic module according to any one of claims 1 to 4, characterized in that: Along the thickness direction of the busbar component (1), the thickness K of the positive busbar (12) and the negative busbar (13) satisfies 0.01 mm ≤ K ≤ 5 mm, and along the width direction of the busbar component (1), the width N1 of the positive busbar (12) and the negative busbar (13) satisfies 1 mm ≤ N1 ≤ 50 mm; There is a gap S between the positive electrode bus bar (12) and the negative electrode bus bar (13), satisfying 1 mm ≤ S ≤ 2 mm.

7. The photovoltaic module according to claim 6, characterized in that: The opening portion (111) is a hollow structure arranged on the surface of the insulating body (11); Along the width direction of the busbar component (1), the width of the opening (111) is N2, and the width N1 of the positive busbar (12) and the negative busbar (13) is equal to the width N2 of the opening (111).

8. The photovoltaic module according to any one of claims 1 to 4, characterized in that: The opening (111) is a groove structure, and the opening (111) penetrates two side walls of the insulating body (11) along the width direction of the current collecting component (1).

9. The photovoltaic module according to any one of claims 1 to 4, characterized in that: The diameter of the welding strip (21) is d, the length of the opening (111) along the length direction of the collector component (1) is L, and the depth of the opening (111) along the thickness direction of the collector component (1) is H, satisfying: 1.5×d≤L≤2×d, and / or, 0.5×d≤H≤d.

10. The photovoltaic module according to any one of claims 1 to 4, characterized in that: The busbar component (1) is located on the back side of the battery cell (22), and at least a portion of the structure of the busbar component (1) and at least a portion of the structure of the battery cell (22) are stacked along the thickness direction of the busbar component (1).

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