Solar cell module, photovoltaic equipment, power utilization device and power generation device

Abstract

The utility model relates to a solar cell module, photovoltaic equipment, a power utilization device and a power generation device, in the solar cell module, a junction box is respectively connected with a positive electrode end and a negative electrode end of a cell body by using two confluence pieces, and electric connection between the junction box and the cell body is realized. During the structural design of the current converging pieces, at least one current converging piece can be designed into a first current converging part, an extension part and a connecting part, and the extension part is positioned outside one end of the battery body along the second direction. Therefore, when the junction box is electrically connected, the extension part is led out of one end of the battery body, so that the distribution of the part, located between the positive electrode end or the negative electrode end and the junction box, of the confluence piece on the surface of the battery body is reduced, the probability of stress concentration of the confluence piece on the battery body is reduced, and the stability of the solar battery assembly is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solar cell, in particular to a solar cell module, a power device for photovoltaic equipment and a power generation device. BACKGROUND

[0002] The solar cell module refers to a device for converting light energy into electrical energy by using photovoltaic effect, which includes a junction box. The junction box is an important part of the solar cell module, mainly serving as a core component for communicating the inside and outside of the module and effectively leading out electrical energy. During the assembly of the junction box, a busbar and an insulating tape are usually arranged in the solar cell module, and the busbar is electrically connected with the junction box. However, due to the structural design of the solar cell module, stress concentration is easily generated inside the solar cell module, thereby affecting the stability of the module. CONTENT OF THE UTILITY MODEL

[0003] Therefore, it is necessary to provide a solar cell module, a power device for photovoltaic equipment, a power device and a power generation device, so as to reduce the probability of stress damage inside the solar cell module and improve the stability of the module.

[0004] In a first aspect, the present application provides a solar cell module, which comprises: a cell body comprising positive and negative terminals spaced apart along a first direction; a junction box located on one side of the cell body along the thickness direction of the cell body; and two busbars respectively connected to the positive and negative terminals and electrically connected to the junction box. At least one of the two busbars comprises a first busbar portion, an extension portion and a connecting portion connected in sequence, the first busbar portion is connected to the positive terminal and / or the negative terminal, the extension portion is located outside one end of the cell body along a second direction, and the connecting portion is connected to the extension portion and the junction box. The first direction, the second direction and the thickness direction of the cell body intersect with each other and are not coplanar.

[0005] The above-mentioned solar cell module uses two busbars to connect the junction box to the positive and negative terminals of the cell body, thereby achieving electrical connection between the junction box and the cell body. In the structural design of the busbar, at least one busbar is designed to have a first busbar portion, an extension portion and a connecting portion, and the extension portion is located outside one end of the cell body along a second direction. Therefore, when electrically connected to the junction box, the extension portion is led out to the outside of one end of the cell body, so that the part of the busbar between the positive terminal or the negative terminal and the junction box is reduced on the surface of the cell body, thereby reducing the probability of stress concentration caused by the busbar to the cell body and improving the stability of the solar cell module.

[0006] In some embodiments, the extension extends along a first direction, and a projection of one end of the extension connected with the connecting portion along a second direction at least partially intersects with a projection of the terminal box along a thickness direction of the battery body. In this way, the projection of the extension along the first direction and the projection of the terminal box along the thickness direction are intersected, so that one end of the extension extends to a position opposite to the terminal box, and thus, when the terminal box is connected, the connecting portion only needs to be distributed along the first direction to be connected with the terminal box, thereby improving the convenience of the connection operation.

[0007] In some embodiments, the solar cell module further comprises a first insulation layer arranged on at least one surface of the extension along the thickness direction of the battery body. In this way, the first insulation layer is arranged on at least one surface of the extension, so as to effectively insulate and protect the part of the busbar extending out.

[0008] In some embodiments, the solar cell module further comprises a second insulation layer arranged around the outer periphery of the battery body and connected with both ends of the first insulation layer. In this way, the second insulation layer is introduced, so that the periphery of the battery body is effectively encapsulated and insulated, which is conducive to improving the structural stability of the solar cell module.

[0009] In some embodiments, the solar cell module further comprises an insulation film arranged on a surface of the battery body facing the terminal box and covering the part of each busbar located on the surface of the battery body, and the connecting portion is located on a side of the insulation film away from the battery body. In this way, the insulation film is introduced, so as to effectively insulate and protect the part of the busbar located on the surface of the battery body; at the same time, the insulation between the connecting portion and the battery body is also achieved, which facilitates the connecting portion to extend from the outside to above the battery body and be connected with the terminal box.

[0010] In some embodiments, the solar cell module further comprises an insulation gasket arranged on the terminal box in the projection area of the insulation film, and the connecting portion is arranged between the insulation gasket and the insulation film and extends out of the insulation gasket to be connected with the terminal box. In this way, the insulation gasket is introduced to cover part of the surface of the connecting portion, so as to effectively insulate and protect, thereby improving the stability of the solar cell module.

[0011] In some embodiments, the solar cell module further comprises a cover covering the insulation film and the insulation gasket, the terminal box is arranged on a surface of the cover away from the insulation film, and the connecting portion extends out of the cover and is connected with the terminal box. In this way, the cover is introduced to effectively encapsulate the battery body.

[0012] In some embodiments, the junction box comprises a box body and a diode arranged in the box body, the diode is arranged in the box body, and the diode and the box body are connected to the two busbars; wherein the end of the connecting portion away from the extending portion is connected to at least the diode. In this way, the diode is introduced to effectively resist the hot spot effect of the solar cell module, which is conducive to alleviating the power consumption caused by local hot spots; in addition, by using the structural design of the first busbar, the extending portion and the connecting portion, the diode can be arranged in the box body under the condition of effective connection, thereby improving the compactness of the structure.

[0013] In some embodiments, the box body is configured as a monolithic structure, and the end of the connecting portion away from the extending portion is connected to the diode and the box body, respectively. In this way, for the monolithic box body, the extending portion is transferred to the outside of one end of the cell body, and the stress damage to the cell body is reduced under the condition of effective connection.

[0014] In some embodiments, the box body comprises two split junction components arranged at the positive and negative ends, respectively, and the diode is arranged in one of the two junction components; wherein one of the busbars comprises a first busbar, an extending portion and a connecting portion, the first busbar is connected to one of the positive and negative ends away from the diode, and is connected to the junction component adjacent to the first busbar, and the connecting portion is connected to the diode; the other busbar is configured as a second busbar extending in the second direction in the cell body, the second busbar is connected to one of the positive and negative ends adjacent to the diode, and is connected to the diode and the junction component having the diode, respectively. In this way, for the split box body, the extending portion is transferred to the outside of one end of the cell body, and the diode can be arranged in the junction component under the condition of effective connection, thereby improving the compactness of the structure.

[0015] In some embodiments, the solar cell module further comprises an adapter, the first busbar is connected to one of the junction components through the adapter, and the second busbar is connected to the diode and the other junction component through the adapter. In this way, the adapter is introduced to effectively connect the junction components, thereby facilitating the wiring operation.

[0016] In some embodiments, the solar cell module further comprises a substrate, the cell body is arranged on the substrate, and the extending portion is located on the part of the substrate beyond the cell body in the second direction. In this way, the substrate is introduced to facilitate the packaging of the solar cell module.

[0017] In a second aspect, the present application provides a photovoltaic device, which comprises the solar cell module of any one of the above.

[0018] In a third aspect, the present application provides a power utilization device, which comprises the solar cell module of any one of the above.

[0019] In a fourth aspect, the present application provides a power generation device, which comprises the solar cell module according to any one of the above. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A structural schematic diagram of the solar cell module according to some embodiments of the present application.

[0021] Figure 2 A structural schematic diagram of the solar cell module according to some embodiments of the present application. Figure 1 A structural sectional view of the solar cell module according to some embodiments of the present application along the direction of A-A.

[0022] Figure 3 A structural schematic diagram of the solar cell module according to some embodiments of the present application in the stage of arranging the first insulating layer and the second insulating layer.

[0023] Figure 4 A structural schematic diagram of the solar cell module according to some embodiments of the present application.

[0024] Figure 5 A structural sectional view of the solar cell module according to some embodiments of the present application along the direction of B-B. Figure 4 A structural sectional view of the solar cell module according to some embodiments of the present application along the direction of B-B.

[0025] 100, solar cell module; 10, cell body; 11, positive electrode terminal; 12, negative electrode terminal; 20, busbar; 21, first busbar part; 22, extension part; 23, connection part; 24, second busbar part; 25, adapter; 30, insulating film; 31, insulating gasket; 32, cover; 33, sealing plug; 40, first insulating layer; 41, second insulating layer; 50, base; 60, junction box; 61, box body; 611, junction part; 61a, first junction part; 61b, second junction part; 62, diode; X, first direction; Y, second direction; Z, thickness direction. DETAILED DESCRIPTION

[0026] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0027] In the description of the application, it should be understood that, if there are these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element 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 application.

[0028] In addition, if there are these terms "first", "second", these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this application, unless otherwise explicitly specified and limited, if there are terms such as "mounting", "connecting", "connecting", "fixing" and the like, these terms should be broadly understood. 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, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0030] In this application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "first feature on or under second feature", the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0031] It is to be noted that when an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used herein are used for illustrative purposes only and are not intended to be limiting.

[0032] With the rapid development of science and technology, the development of new energy has made continuous breakthroughs. For example, solar cells represented by perovskite and organic thin film batteries have made revolutionary progress. Due to their advantages of high efficiency and low cost, such solar cells are expected to become mainstream products in solar cells.

[0033] In a photovoltaic module, in order to achieve electrical connection with external equipment, a junction box is generally provided on the cell body in the photovoltaic module. When connecting the junction box, a busbar such as a copper tape is usually provided on the positive and negative terminals of the cell body. Since the junction box is between the positive and negative terminals, part of the busbar is distributed on the surface of the cell body in the direction from the positive terminal to the negative terminal. At the same time, the part of the busbar distributed in the direction from the positive terminal to the negative terminal needs to be insulated from the cell body, and an insulating tape is usually provided between the busbar and the cell body.

[0034] However, due to the presence of the insulating tape and the busbar on the surface of the cell body, stress concentration will occur on the cell body during subsequent lamination, which can easily cause damage to the internal structure of the cell body, thereby accelerating the degradation of the internal structure of the cell body and affecting the stability of the module.

[0035] Therefore, in view of the problem of stress concentration damage and the influence on the stability of the structure in the traditional solar cell module, the present application provides a solar cell module. Two busbars are used to connect the junction box to the positive and negative terminals of the cell body, respectively, to achieve electrical connection between the junction box and the cell body. In the structural design of the busbar, at least one busbar can be designed as a first busbar portion, an extension portion, and a connecting portion. The extension portion is located outside one end of the cell body in the second direction. As can be seen, when electrically connected to the junction box, the extension portion is led out to one end of the cell body, so that the part of the busbar between the positive or negative terminal and the junction box is reduced in distribution on the surface of the cell body, reducing the probability of stress concentration caused by the busbar on the cell body, and improving the stability of the solar cell module.

[0036] It should be noted that the battery body refers to a component in the solar cell module that converts light energy into electrical energy. For ease of understanding, taking a perovskite solar cell module as an example, the battery body can include a base glass, a transparent conductive layer, an electron transport layer, a perovskite layer, a hole transport layer, and a metal electrode.

[0037] According to some embodiments of the present application, referring to Figure 1 The present application provides a solar cell module 100, which comprises a battery body 10, a junction box 60, and two busbars 20. The battery body 10 comprises positive and negative terminals 11 and 12 spaced apart along a first direction X, and the junction box 60 is located on one side of the battery body 10 along the thickness direction Z thereof. The two busbars 20 are respectively connected to the positive and negative terminals 11 and 12, and are electrically connected to the junction box 60. Among the two busbars 20, at least one comprises a first busbar portion 21, an extension portion 22, and a connecting portion 23 connected in sequence, the first busbar portion 21 is connected to the positive and / or negative terminal 11 and 12, the extension portion 22 is located outside one end of the battery body 10 along a second direction Y, and the connecting portion 23 is connected to the extension portion 22 and the junction box 60. The first direction X, the second direction Y, and the thickness direction Z of the battery body 10 intersect with each other and are not coplanar.

[0038] The battery body 10 refers to a component in the solar cell module 100 that converts light energy into electrical energy, and the two ends thereof along the first direction X are the negative and positive terminals 12 and 11, respectively. The junction box 60 refers to a core component that mainly communicates the inside and outside of the module and effectively leads out the electrical energy. The connection of the junction box 60 on the battery body 10 can be connected to the positive and negative terminals 11 and 12 through the busbar 20.

[0039] The current collector 20 refers to a structure with electrically conductive function, which is used for electric energy export or import of the battery body 10, such as, but not limited to, copper tape, etc. In the two current collectors 20, at least one current collector 20 includes a first current collecting portion 21, an extension portion 22, and a connecting portion 23. The first current collecting portion 21 refers to a structure connected to the positive terminal 11 or the negative terminal 12, which is used for electric energy export or import of the battery body 10. The extension portion 22 refers to a structure of the current collector 20 located outside one end of the battery body 10 along the second direction Y, so that the connecting portion 23 can extend into the battery body 10 from one end of the battery body 10 along the second direction Y and be connected to the junction box 60. Compared with directly extending from the positive terminal 11 or the negative terminal 12 to the junction box 60 along the second direction Y, the extension portion 22 of the present embodiment is led out of the battery body 10, which can partially or completely cancel the traditional transverse current collector 20 and the insulating tape, thereby reducing the stress damage to the battery body 10. In addition, the junction box 60 can not be provided with a diode 62, or can be provided with a diode 62. When the junction box 60 is provided with a diode 62, the connecting portion 23 can be electrically connected with the diode 62, or can be electrically connected with other components in the junction box 60. The specific wiring mode can be determined according to the wiring requirements of the junction box 60.

[0040] When the junction box 60 is provided with a diode 62, the diode 62 can resist the hot spot effect. For example, when the diode 62 is connected in parallel with the positive terminal 11 and the negative terminal 12, when the solar cell module 100 is shaded, the diode 62 works to disconnect the current conduction of the solar cell module 100, thereby reducing the heat generation of the solar cell module 100. In addition, when only one of the two current collectors 20 includes the first current collecting portion 21, the extension portion 22, and the connecting portion 23, the other current collector 20 can be connected to the junction box 60 in a traditional connection mode. Of course, the junction box 60 can also be directly moved to one of the current collectors 20, thereby shortening the connection path between the junction box 60 and the current collector 20.

[0041] The extension portion 22 is located outside one end of the battery body 10 along the second direction Y, and one end thereof can extend to a position opposite to the junction box 60 in the first direction X, so that the connecting portion 23 extends along the first direction X and is connected to the junction box 60. Of course, the connecting portion 23 can also extend along the second direction Y but not extend to the position opposite to the junction box 60 in the first direction X, and at this time, the connecting portion 23 can extend from outside the battery body 10 to the junction box 60 in an inclined direction.

[0042] It should be noted that the first direction X and the second direction Y are concepts introduced when the battery body 10 is in a flat state, and thus, if the solar cell module 100 is a flexible and curved battery, the solar cell module 100 can be flattened to determine the respective directions of the first direction X and the second direction Y on the battery body 10.

[0043] Therefore, when the extension portion 22 is led out to one end of the battery body 10, the part of the busbar 20 between the positive terminal 11 or the negative terminal 12 and the junction box 60 is reduced in distribution on the surface of the battery body 10, the probability of stress concentration of the busbar 20 on the battery body 10 is reduced, and the stability of the solar cell module 100 is improved.

[0044] According to some embodiments of the present application, optionally, referring to Figure 1 and Figure 2 The extension portion 22 extends along the first direction X, and the projection of the end of the extension portion 22 connected with the connection portion 23 along the second direction Y at least partially intersects with the projection of the junction box 60 along the thickness direction Z of the battery body 10.

[0045] The projection of the end of the extension portion 22 connected with the connection portion 23 along the second direction Y is to make the end of the extension portion 22 extendable to a position opposite to the junction box 60 in the second direction Y. It should be noted that in some embodiments, the extension portion 22 extends outward from the surface of the battery body 10, and the junction box 60 can be arranged on the surface of the cover 32 covering the battery body 10, and thus, there can be a difference in the thickness direction Z of the battery body 10 between the extension portion 22 and the junction box 60. Therefore, in the present embodiment, the projection of the junction box 60 along the thickness direction Z of the battery body 10 is taken as a reference, and when the projection of the end of the extension portion 22 along the first direction X intersects with the projection of the junction box 60, it means that the end of the extension portion 22 is extendable to a position opposite to the junction box 60 in the first direction X. In some examples, the first direction X, the second direction Y and the thickness direction Z of the battery body 10 are perpendicular to each other.

[0046] The shape of the extension portion 22 outside one end of the battery body 10 can have various designs, such as: the extension portion 22 extends linearly along the second direction Y, showing a linear structure; or the extension portion 22 extends along the second direction Y in a curve, such as: the extension portion 22 shows a curved structure arched towards the side away from the battery body 10, etc.

[0047] In addition, the extension 22 and the connecting portion 23 can be connected by clamping, bonding, bolt connection, welding, etc. Alternatively, the extension 22 and the connecting portion 23 can be designed as an integrated structure, for example, a part of the busbar 20 is arranged to extend along the second direction Y to form the extension 22, and the extension 22 is bent towards one side of the battery body 10 at one end of the extension 22 to form the connecting portion 23. Of course, the connecting portion 23 and the extension 22 can be integrally formed by 3D printing technology, die casting, extrusion, etc. In some embodiments, the busbar, the extension 22 and the connecting portion 23 are integrated.

[0048] In this way, the projection of the extension 22 along the first direction X and the projection of the junction box 60 along the thickness direction Z are intersected, so that one end of the extension 22 extends to the position opposite to the junction box 60. Thus, when connecting, the connecting portion 23 can be distributed along the first direction X to be connected with the junction box 60, thereby improving the convenience of connection operation.

[0049] According to some embodiments of the present application, optionally, referring to Figure 3 With Figure 4 The solar cell module 100 further comprises a first insulating layer 40 arranged on at least one surface of the extension 22 along the thickness direction Z of the battery body 10.

[0050] The first insulating layer 40 can be arranged below the extension 22, or arranged above the extension 22. Of course, two first insulating layers 40 can be arranged above and below the extension 22, respectively. When the first insulating layer 40 is arranged below the extension 22, the thickness of the first insulating layer 40 can be designed to allow the top surface of the extension 22 to be flush or substantially flush with the top surface of the battery body 10, so as to reduce the height difference between the extension 22 and the battery body 10, and facilitate the connecting portion 23 to extend from the outside to the top surface of the battery body 10. For example, the thickness of the first insulating layer 40 can be, but is not limited to, 0.2mm-0.6mm, such as 0.4mm, etc.

[0051] In addition, when the first insulating layer 40 is arranged on two surfaces of the extension 22, respectively, in the preparation process, the first insulating layer 40 can be arranged on one end of the battery body 10 along the second direction Y, wherein the first insulating layer 40 extends along the first direction X. Then, the extension 22 is arranged on the surface of the first insulating layer 40, so that the extension 22 reaches the position corresponding to the junction box 60. Finally, a layer of the first insulating layer 40 is arranged on the surface of the extension 22, and the two layers of the first insulating layer 40 are controlled to overlap with each other.

[0052] The material of the first insulating layer 40 can be selected in various ways, for example, but not limited to, butyl rubber, silicone, etc.

[0053] In this way, the first insulating layer 40 is arranged on at least one surface of the extension 22, so that the part of the busbar 20 extending out of the solar cell module 100 is effectively insulated and protected.

[0054] According to some embodiments of the present application, optionally, referring to Figure 3 With Figure 4 The solar cell module 100 further comprises a second insulating layer 41, which is arranged around the outer periphery of the cell body 10 and connected to both ends of the first insulating layer 40.

[0055] The second insulating layer 41 is connected to the first insulating layer 40, so as to form an encapsulation space, so that the outer periphery of the cell body 10 is effectively encapsulated; at the same time, the insulation protection of the four sides of the cell body 10 is also achieved. The materials of the first insulating layer 40 and the second insulating layer 41 can be the same or different. For example, both the first insulating layer 40 and the second insulating layer 41 can be butyl rubber, but are not limited to butyl rubber.

[0056] In this way, the second insulating layer 41 is introduced, so that the four sides of the cell body 10 are effectively encapsulated and insulated, which is conducive to improving the structural stability of the solar cell module 100.

[0057] According to some embodiments of the present application, optionally, referring to Figure 2 The solar cell module 100 further comprises an insulating film 30, which is arranged on the surface of the cell body 10 facing the junction box 60 and covers the part of each busbar 20 located on the surface of the cell body 10, and the connecting portion 23 is located on the side of the insulating film 30 away from the cell body 10.

[0058] When one of the busbars 20 comprises the first busbar portion 21, the extension 22 and the connecting portion 23, after the insulating film 30 is arranged on the surface of the cell body 10, the first busbar portion 21 of the busbar 20 can be covered, but the extension 22 and the connecting portion 23 of the busbar 20 cannot be covered. For example, the first busbar portion 21 is covered by the insulating film 30, but the extension 22 and the connecting portion 23 are not covered. At this time, the connecting portion 23 can extend to the side of the insulating film 30 away from the cell body 10, so that the connecting portion 23 and the cell body 10 are insulated. When the busbar 20 is completely located in the surface of the cell body 10, the insulating film 30 can cover the entire busbar 20. In some embodiments, the insulating film 30 completely covers the surface of the cell body 10.

[0059] It should be noted that the material of the insulating film 30 has multiple options, as long as it can achieve a volume resistivity ≥ 10 15Ω·cm, bonding strength to tempered cover plate glass ≥ 60 N / cm, such as: TPO (Thermoplastic polyolefin), POE (Polyolefin Elastomer), EVA (Ethylene Vinyl Acetate Copolymer), PVB (Polyvinyl Butyral), TPU (Thermoplastic Polyurethane) and the like.

[0060] In this way, the insulating film 30 is introduced to effectively insulate the part of the busbar 20 located on the surface of the battery body 10; at the same time, the insulation between the connecting portion 23 and the battery body 10 is facilitated, so that the connecting portion 23 extends from the outside to above the battery body 10 and is connected with the junction box 60.

[0061] According to some embodiments of the present application, optionally, please refer to Figure 2 The solar cell module 100 further comprises an insulating gasket 31, which is attached to the junction box 60 in the projection area of the insulating film 30, and the connecting portion 23 is arranged between the insulating gasket 31 and the insulating film 30 and extends out of the insulating gasket 31 to connect with the junction box 60.

[0062] The connecting portion 23 extends from one end of the battery body 10 to the surface of the insulating film 30 and extends to the projection area of the junction box 60 on the insulating film 30. At this time, the connecting portion 23 directly exposed below the junction box 60 with the surface of the insulating film 30 facing away, which is not conducive to insulation. Therefore, the insulating gasket 31 is arranged in the projection area of the junction box 60 on the insulating film 30, so that the insulating gasket 31 covers at least part of the surface of the connecting portion 23. Since the connecting portion 23 needs to be connected with the junction box 60, one end of the connecting portion 23 also needs to penetrate the insulating gasket 31. Of course, in some embodiments, the insulating gasket 31 can also extend to the end of the battery body 10 close to the extension portion 22 along the second direction Y to insulate more parts of the connecting portion 23.

[0063] Among them, the material of the insulating gasket 31 can also be various, as long as it can achieve effective insulation (volume resistivity ≥ 10 14Ω·cm), such as, but not limited to, PMMA (Polymethyl Methacrylate), PET (polyethylene glycol terephthalate), PI (Polyimide), PC (Polycarbonate), PVB (Polyvinyl Butyral), and the like.

[0064] In this way, the insulating gasket 31 is introduced to cover part of the surface of the connecting portion 23, so as to achieve effective insulation protection and improve the stability of the solar cell module 100.

[0065] According to some embodiments of the present application, optionally, referring to Figure 2 The solar cell module 100 further comprises a cover 32 covering the insulating film 30 and the insulating gasket 31, and the junction box 60 is arranged on the surface of the cover 32 away from the insulating film 30, and the connecting portion 23 penetrates through the cover 32 and is connected with the junction box 60.

[0066] The cover 32 refers to a structure for sealing the top surface of the cell body 10, and it also provides structural support for the installation of the junction box 60. The cover 32 can be a transparent structure, such as, but not limited to, glass.

[0067] In addition, since the junction box 60 is arranged on the side of the cover 32 away from the insulating film 30, a hole needs to be formed on the cover 32 to facilitate the penetration of the busbar 20 through the cover 32 and the connection with the junction box 60. At this time, in order to reduce the penetration of water and oxygen, a plugging plug 33 can be inserted into the hole structure of the cover 32.

[0068] In this way, the cover 32 is introduced to achieve effective packaging of the cell body 10.

[0069] According to some embodiments of the present application, optionally, referring to Figure 2 The junction box 60 comprises a box body 61 and a diode 62 arranged in the box body 61, the diode 62 is arranged in the box body 61, and the diode 62 and the box body 61 are both connected to the two busbars 20; wherein the end of the connecting portion 23 away from the extending portion 22 is connected to at least the diode 62.

[0070] The box body 61 refers to the main component in the terminal box 60, and is used to communicate the inside and outside of the assembly and effectively lead out the electric energy. The box body 61 can be designed as a whole structure, which can be arranged between the positive terminal 11 and the negative terminal 12, or arranged at the positive terminal 11 or the negative terminal 12. When the box body 61 is arranged at the positive terminal 11 or the negative terminal 12, the box body 61 can be directly connected with the busbar 20 close to itself, and the wiring structure extending along the first direction X between the busbar 20 and the box body 61 can be cancelled or shortened. Meanwhile, the box body 61 can also be designed as a split structure, for example, the box body 61 can include two parts, one part of which can be arranged at the positive terminal 11, and the other part of which can be arranged at the negative terminal 12, so that the stress damage caused by the part of the busbar 20 extending along the first direction X to the battery body 10 can be effectively reduced. In addition, if the box body 61 is divided into two parts, and the diode 62 is arranged in one of the two parts, it means that the diode 62 can be directly connected with one of the positive terminal 11 and the negative terminal 12, but has a certain distance from the other one of the positive terminal 11 and the negative terminal 12 along the first direction X. At this time, the busbar 20 away from the diode 62 can be designed as the first busbar part 21, the extension part 22 and the connecting part 23.

[0071] The diode 62 refers to a device connected in parallel with the box body 61 between the positive terminal 11 and the negative terminal 12, and can resist the hot spot effect. The diode 62 is arranged in the box body 61, which can reduce the occupation of the space outside the terminal box 60, and make the structure more compact. The diode 62 needs to be connected with the positive terminal 11 and the negative terminal 12 respectively, so no matter where the diode 62 is located in the battery body 10, the diode 62 will keep a distance from the positive terminal 11 and the negative terminal 12 along the first direction X. In order to reduce the stress damage to the inside of the assembly caused by the extension of the busbar 20 along the first direction X, at least one busbar 20 is designed as the first busbar part 21, the extension part 22 and the connecting part 23, so that the part of the busbar 20 extending along the first direction X is transferred to the outside of one end of the battery body 10.

[0072] In addition, it should be noted that, Figure 2 The box body 61 and the diode 62 shown are only structural schematic diagrams, and the specific structures of the box body 61 and the diode 62 are not shown, and the specific connection circuits of the box body 61 and the diode 62 are not the objects to be improved in the present application, and can refer to the existing connection mode, so the specific connection circuits of the box body 61 and the diode 62 are not shown in the Figure 2 .

[0073] In this way, the diode 62 is introduced to effectively resist the hot spot effect of the solar cell module 100, and to help alleviate the power consumption caused by the local hot spot. In addition, by using the structural design of the first busbar 21, the extension 22 and the connecting portion 23, the diode 62 is allowed to be arranged in the box body 61 under the condition of effective connection of the diode 62, thereby improving the compactness of the structure.

[0074] According to some embodiments of the present application, optionally, please refer to Figure 1 The box body 61 is configured as a monolithic structure, and the connecting portion 23 is connected to the diode 62 and the box body 61 respectively away from the extension 22.

[0075] The monolithic structure refers to a structure integrated in the same housing and formed as a whole. At this time, the box body 61 can be arranged at the positive terminal 11, or at the negative terminal 12. Of course, it can also be arranged between the positive terminal 11 and the negative terminal 12.

[0076] When the box body 61 is arranged at the positive terminal 11, there is a certain distance between the box body 61 and the negative terminal 12. In order to reduce the stress damage of the busbar 20 to the battery body 10, the busbar 20 connected to the negative terminal 12 can be designed as the first busbar 21, the extension 22 and the connecting portion 23. When the box body 61 is arranged at the negative terminal 12, the busbar 20 connected to the positive terminal 11 can be designed as the first busbar 21, the extension 22 and the connecting portion 23. At the same time, when the box body 61 is located between the positive terminal 11 and the negative terminal 12, both busbars 20 can be designed as the first busbar 21, the extension 22 and the connecting portion 23.

[0077] In addition, since the box body 61 is a monolithic structure, when the diode 62 is arranged in the junction box 60, the wiring mode of the diode 62 can be consistent with the wiring mode of the box body 61.

[0078] For ease of understanding, the junction box 60 located between the positive terminal 11 and the negative terminal 12 can be experimentally explained. For example, in Comparative Example 1, copper adhesive tape is attached to the positive terminal 11 and the negative terminal 12 respectively, and the copper adhesive tape is attached to the surface of the battery body 10 along the first direction X, so that the copper adhesive tape is connected to the junction box 60. In Example 1, both busbars 20 are designed as the first busbar 21, the extension 22 and the connecting portion 23, and the first busbar 21, the extension 22 and the connecting portion 23 are all copper adhesive tapes. The other structures of the solar cell module 100 in Example 1 and Comparative Example 1 are consistent.

[0079] The stability tests of Example 1 and Comparative Example 1 are as follows.

[0080] (1) IV test: using AAA-grade solar simulator as light source, high-precision source table as test equipment, voltage scanning range from -0.5V to 48V, data acquisition delay of 20ms, current and voltage data are collected, the program draws I-V curve with voltage as horizontal axis and current as vertical axis, the horizontal axis intercept is open circuit voltage Voc, the vertical axis intercept is short circuit current Jsc, the product of I and V on the IV curve is the power under the corresponding load, and the ratio of the maximum value of the power to the irradiation power of the solar simulator is the efficiency PCE. The mean value of multiple data under the same experimental conditions is taken.

[0081] (2) PL test: photoluminescence (PL) test, the module is placed on a photoluminescence imaging device, 502nm light is used as excitation light to irradiate the assembly, and a special camera is used to collect 700~900nm photoluminescence intensity imaging on a 2D plane.

[0082] (4) EL test: electroluminescent (EL) test, the module is placed on an electroluminescent imaging device, the positive and negative electrode lines are connected to the interface on the device, the source table is adjusted, and an additional current of 300mA is input at 44V. A special camera is used to collect 700~900nm photoluminescence intensity imaging on a 2D plane.

[0083] (5) UV-TC sequence test: according to IEC 61215-2:2021 MQT10, first place the device in a UV aging box with a temperature control of 60℃, and irradiate it for 60h under a light source with an irradiance of 250W / m 2 from 280nm to 400nm, then transfer it to a thermal cycle test box, according to IEC 61215-2:2021 MQT11, perform a thermal cycle test from -40℃ to 85℃ with a temperature rise and fall rate of 1℃ / min, and keep 85℃ and -40℃ for 45min respectively, for a total of 200 cycles. After taking out, place it at room temperature for one hour, then perform visual inspection and measure the IV, PL and EL after aging.

[0084] Calculate the photoelectric conversion efficiency loss rate (PCE loss rate) before and after the UV-TC sequence test, and the calculation formula is as follows:

[0085]

[0086] and record the visual inspection results.

[0087] (6) DH test: IV test is performed on the perovskite photovoltaic module obtained in Example 1 and Comparative Example 1 to obtain the photoelectric conversion efficiency before the damp heat test.

[0088] Then the damp heat test (MQT 13) specified in IEC61215:2021 standard is carried out. The test method is: the junction box of the perovskite photovoltaic module is short-circuited, and is placed in a constant temperature and humidity chamber with a temperature of 85±2℃ and a humidity of 85±5%RH. Every 500h of aging, the program is controlled to reduce the temperature at a rate of 1.5℃ / min. After about 40min of recovery to room temperature, continue to recover for 2 hours at 23±5℃ and below 75%RH in open circuit, and carry out visual inspection, photographing, and measurement of IV test, PL imaging detection, and EL imaging detection after aging. Then it is put back and continues to age until the PCE decreases to less than 80% of the initial value and the component appears yellow abnormality in visual inspection, and the test is stopped. The total time of aging when the PCE first decreases to less than 80% of the initial value is recorded as T 80 , and the total time of aging when the component first appears yellow abnormality in visual inspection is recorded as T 进水 .

[0089] The test results are as follows:

[0090] Comparative Example 1 Example 1 UV-TC Sequence Test PL Image Busbar Under Exception Yes No UV-TC Sequence Test EL Image Busbar Under Exception Yes No UV-TC Sequence Test PCE Loss Rate 6.75% 2.17% DH Test PL Image Busbar Under Exception Yes No DH Test EL Image Busbar Under Exception Yes No DH test T 80 ]] 4600h 6270h DH test T 进水 ]] 5700h 5700h

[0091] It can be seen that the scheme of example 1 effectively solves the stress damage problem under the busbar 20 under the premise of almost no loss of DH test T 进水 , and better results are achieved in UV-TC sequence test and DH test.

[0092] It is shown that transferring part of the busbar 20 to one end of the battery body 10 can effectively reduce the stress damage of the battery body 10, slow down the degradation of the internal structure of the battery body 10, and improve the stability of the module.

[0093] Such design, for the integral box body 61, transfers the extension part 22 to one end of the battery body 10, reduces the stress damage to the battery body 10 under the condition of meeting effective connection.

[0094] According to some embodiments of the present application, optionally, please refer to Figure 4 and Figure 5The box body 61 comprises two split wiring components 611, which are respectively arranged at the positive terminal 11 and the negative terminal 12, and the diode 62 is arranged in one of the two wiring components 611. One of the busbars 20 comprises a first busbar portion 21, an extension portion 22 and a connecting portion 23, the first busbar portion 21 is connected to one of the positive terminal 11 and the negative terminal 12 which is away from the diode 62, and is connected to the wiring component 611 close to the first busbar portion 21, and the connecting portion 23 is connected to the diode 62. The other busbar 20 is configured as a second busbar portion 24 extending along the second direction Y in the battery body 10, the second busbar portion 24 is connected to one of the positive terminal 11 and the negative terminal 12 close to the diode 62, and is connected to the diode 62 and the wiring component 611 having the diode 62 inside, respectively.

[0095] When the box body 61 is designed as a split structure, such as two wiring components 611, the two wiring components 611 are arranged at the positive terminal 11 and the negative terminal 12, so as to short the wiring distance between the wiring component 611 and the positive terminal 11 or the negative terminal 12. Since the diode 62 needs to be connected to the positive terminal 11 and the negative terminal 12 at the same time, in the conventional wiring mode, the diode 62 is arranged outside the box body 61, and a busbar is separately arranged to complete the positive and negative connection of the diode 62. However, this mode causes a large number of external devices of the assembly and occupies a large space.

[0096] Therefore, in the embodiment, one of the busbars 20 is designed as the first busbar portion 21, the extension portion 22 and the connecting portion 23. The second busbar portion 24 refers to a structure located on the surface of the battery body 10 and extending along the second direction Y, so that the diode 62 can also be integrated in the wiring component 611 while meeting the effective connection of the diode 62.

[0097] For the convenience of understanding, please refer to Figure 4 Taking two wiring components 611 as a first wiring component 61a and a second wiring component 61b, and the diode 62 arranged inside the second wiring component 61b as an example, the first wiring component 61a is arranged at the positive terminal 11, and the second wiring component 61b is arranged at the negative terminal 12. At this time, the busbar 20 close to the first wiring component 61a can comprise the first busbar portion 21, the extension portion 22 and the connecting portion 23, and the busbar 20 close to the second wiring component 61b can be designed as the second busbar portion 24. The first busbar portion 21 is connected to the first wiring component 61a, and the second busbar portion 24 is connected to the second wiring component 61b and the diode 62, respectively, to complete the connection of the second wiring component 61b and the diode 62 to the negative terminal 12. The connection between the diode 62 and the positive terminal 11 is completed by the extension portion 22 and the connecting portion 23, and at this time, the extension portion 22 extends from the positive terminal 11 to the negative terminal 12 along the first direction X outside one end of the battery body 10.

[0098] Additionally, it should be noted that, Figure 5 The shown housing 61 and diode 62 are only schematic diagrams and do not depict their specific structures. Furthermore, the specific connection circuits of housing 611 and diode 62 are not the objects of improvement in this application; existing connection methods can be referenced. Therefore, in Figure 5 The specific connection circuit between the housing 611 and the diode 62 is not shown in the image.

[0099] With this design, for the split-type box body 61, the extension 22 is moved to one end of the battery body 10. While ensuring the effective connection of the diode 62, the diode 62 can be placed inside the wiring component 611, improving the compactness of the structure.

[0100] Optionally, according to some embodiments of this application, please refer to Figure 4 and Figure 5 The solar cell module 100 also includes an adapter 25, a first busbar 21 connected to one of the wiring components 611 via the adapter 25, and a second busbar 24 connected to the diode 62 and the other wiring component 611 via the adapter 25.

[0101] The adapter 25 is a component that enables electrical connection between the wiring component 611 and the first busbar 21 or the second busbar 24. It can be, but is not limited to, copper tape. The adapter 25 can be fixed to the first busbar 21 or the second busbar 24 by welding, snap-fitting, or other methods. Alternatively, the adapter 25 can be an integral part of the first busbar 21 or the second busbar 24, for example, by cutting or extrusion.

[0102] This design incorporates an adapter 25, which can effectively connect the wiring component 611, facilitating wiring operations.

[0103] Optionally, according to some embodiments of this application, please refer to Figure 2 The solar cell module 100 also includes a substrate 50, a cell body 10 disposed on the substrate 50, and an extension 22 located on the portion of the substrate 50 that extends beyond the cell body 10 along the second direction Y.

[0104] The substrate 50 is also called the base plate or substrate. The material of the substrate 50 can be, but is not limited to, glass, tempered glass, quartz, organic flexible materials, etc. To facilitate the encapsulation of the battery body 10, the substrate 50 needs to extend beyond the battery body 10 on all sides. For example, in the fabrication of the solar cell module 100, after the battery body 10 is formed on the substrate 50, the edges of the battery body 10 can be cleaned to expose the substrate 50.

[0105] This design introduces a substrate 50, which facilitates the encapsulation of the solar cell module 100.

[0106] According to some embodiments of the present application, the present application provides a photovoltaic device, the photovoltaic device comprising the solar cell module 100 of any one of the above.

[0107] According to some embodiments of the present application, the present application provides an electric device, the electric device comprising the solar cell module 100 of any one of the above.

[0108] According to some embodiments of the present application, the present application provides a power generation device, the power generation device comprising the solar cell module 100 of any one of the above.

[0109] The power generation device refers to a power generation system for directly converting solar radiation energy into electric energy by photovoltaic effect, which is divided into a stand-alone photovoltaic power generation system and a grid-connected photovoltaic power generation system. The stand-alone photovoltaic power generation system is composed of a solar photovoltaic array, a storage battery, a charge controller, a power electronic converter (inverter), a load and the like. The grid-connected photovoltaic power generation system is composed of a photovoltaic array, a high-frequency DC / DC boost circuit, a power electronic converter (inverter) and a system monitoring part.

[0110] According to some embodiments of the present application, please refer to Figures 1 to 5 , the present application provides a solar cell module 100, the solar cell module 100 comprising a cell body 10, a junction box 60 and a busbar 20. The junction box 60 comprises a box body 61 and a diode 62. The box body 61 can be a whole structure or a split structure. When the box body 61 is a whole structure, two busbars 20 each comprise a first busbar 21, an extension 22 and a connecting part 23. The two first busbars 21 are respectively attached to the positive terminal 11 and the negative terminal 12 of the cell body 10. The extension 22 is located outside one end of the cell body 10 and extends to the position where the junction box 60 is located. The connecting part 23 is connected to the extension 22 at one end and connected to the box body 61 and the diode 62 at the other end.

[0111] When the box body 61 comprises two split junction parts 611, one busbar 20 comprises a first busbar 21, an extension 22 and a connecting part 23, and the other busbar 20 is a second busbar 24 located on the surface of the cell body 10. The two junction parts 611 are respectively arranged at the positive terminal 11 and the negative terminal 12. The first busbar 21 is connected to the junction part 611 close to itself. The second busbar 24 is connected to the junction part 611 close to itself and the diode 62. The connecting part 23 is also connected to the diode 62.

[0112] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, it is to be understood that the application embraces all such possible combinations.

[0113] The above-described embodiments only express several implementation manners of the application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that, for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the application, and these all belong to the protection scope of the application. Therefore, the patent protection scope of the application should be subject to the appended claims.

Claims

1. A solar cell module, characterized by, The solar cell module comprises: a cell body comprising positive and negative terminals spaced apart along a first direction; a junction box located on one side of the cell body along a thickness direction thereof; two busbars respectively corresponding to the positive and negative terminals and electrically connected to the junction box; wherein at least one of the two busbars comprises a first busbar portion, an extension portion and a connecting portion connected in sequence, the first busbar portion is connected to the positive and / or negative terminal, the extension portion is located outside one end of the cell body along a second direction, and the connecting portion is connected to the extension portion and the junction box; the first direction, the second direction and the thickness direction of the cell body intersect with each other and are not coplanar.

2. The solar cell module according to claim 1, characterized by The extension portion extends along the first direction, and a projection of an end of the extension portion connected to the connecting portion along the second direction at least partially intersects with a projection of the junction box along the thickness direction of the cell body.

3. The solar cell module according to claim 1, characterized by The solar cell module further comprises a first insulating layer provided on at least one surface of the extension portion along the thickness direction of the cell body.

4. The solar cell module according to claim 3, characterized by The solar cell module further comprises a second insulating layer provided around the outer periphery of the cell body and connected to both ends of the first insulating layer.

5. The solar cell module according to claim 1, characterized by The solar cell module further comprises an insulating film provided on the surface of the cell body facing the junction box and covering the part of each busbar located on the surface of the cell body, and the connecting portion is located on the side of the insulating film away from the cell body.

6. The solar cell module according to claim 5, wherein The solar cell module further comprises an insulating gasket attached to the projection area of the junction box in the insulating film, and the connecting portion is provided between the insulating gasket and the insulating film and connected to the junction box through the insulating gasket.

7. The solar cell module according to claim 6, characterized by The solar cell module further comprises a cover covering the insulating film and the insulating gasket, and the junction box is provided on the surface of the cover away from the insulating film, and the connecting portion is connected to the junction box through the cover.

8. The solar cell module according to any one of claims 1 to 7, characterized by, The junction box comprises a box body and a diode provided in the box body, the diode is provided in the box body, and the diode and the box body are connected to the two busbars; wherein the end of the connecting portion away from the extension portion is connected to the diode.

9. The solar cell module according to claim 8, characterized by The box body is configured as a monolithic structure, and the end of the connecting portion away from the extension portion is connected to the diode and the box body, respectively.

10. The solar cell module according to claim 8, characterized by The box body comprises two separate wiring components, and the two wiring components are respectively provided at the positive and negative terminals, and the diode is provided in one of the two wiring components; wherein one of the busbars comprises the first busbar portion, the extension portion and the connecting portion, the first busbar portion is connected to the terminal away from the diode among the positive and negative terminals and connected to the wiring component close to the terminal, and the connecting portion is connected to the diode; Another of the busbars is configured as a second busbar extending in the second direction within the cell body, the second busbar being connected to one of the positive terminal and the negative terminal closer to the diode and being connected to the diode and the wiring member having the diode therein, respectively.

11. The solar cell module according to claim 10, characterized by The solar cell module further includes a jumper, the first busbar being connected to one of the wiring members through the jumper, and the second busbar being connected to the diode and the other of the wiring members through the jumper.

12. The solar cell module according to any one of claims 1 to 7, characterized by, The solar cell module further includes a substrate, the cell body being provided on the substrate, and the extension portion being located at a portion of the substrate that extends beyond the cell body in the second direction.

13. A photovoltaic device, characterized by The photovoltaic device includes the solar cell module according to any one of claims 1 to 12.

14. An electrical device, characterized by The power consuming device includes the solar cell module according to any one of claims 1 to 12.

15. A power generation device characterized by comprising: The power generating device includes the solar cell module according to any one of claims 1 to 12.

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