Photovoltaic module and photovoltaic system

Abstract

This disclosure relates to a photovoltaic module and a photovoltaic system. The photovoltaic module includes a first cover plate, a first encapsulating film, a battery cell, a second encapsulating film, and a second cover plate arranged in sequence. The battery cell includes a battery string group, which includes multiple battery strings arranged along a first direction. Adjacent battery strings are overlapped at their edges in the first direction to form an overlapping region. The overlapping region is provided with an insulating structure separating the edges of adjacent battery strings. The insulating structure includes an insulating layer, the melting temperature of which is higher than the melting temperature of the first and second encapsulating films. Through the above technical solution, the photovoltaic module provided by this disclosure can solve the problem of low module efficiency caused by gaps between adjacent battery strings in related technologies, and has the advantages of high module efficiency, high safety, and high reliability.

Description

Technical Field

[0001] This disclosure relates to the field of photovoltaic technology, and more specifically, to a photovoltaic module and a photovoltaic system. Background Technology

[0002] In related technologies, there are gaps between two adjacent cell strings in photovoltaic modules. That is, the cell strings are designed with a positive spacing, resulting in more blank space in the photovoltaic module and affecting the module efficiency. Utility Model Content

[0003] The purpose of this disclosure is to provide a photovoltaic module and a photovoltaic system that can solve the problem of low module efficiency caused by gaps between adjacent cell strings in the related art.

[0004] To achieve the above objectives, a first aspect of this disclosure provides a photovoltaic module, the photovoltaic module comprising a first cover plate, a first encapsulating film, a battery cell, a second encapsulating film, and a second cover plate arranged in sequence; the battery cell includes a battery string group, the battery string group including a plurality of battery strings arranged along a first direction, the edges of two adjacent battery strings in the first direction are stacked to form an overlapping region, the overlapping region being provided with an insulating structure separating the edges of two adjacent battery strings; the insulating structure includes an insulating layer, the melting temperature of the insulating layer being greater than the melting temperature of the first encapsulating film and the second encapsulating film.

[0005] Optionally, the width of the insulating structure in the first direction is greater than the width of the overlapping region.

[0006] Optionally, the insulating structure in the first direction has a first insulating segment and a second insulating segment located on both sides of the overlapping region and arranged opposite to each other; wherein the first insulating segment is attached to the corresponding battery string and has a first gap with the solder strip on the battery string; and / or, the second insulating segment is attached to the corresponding battery string and has a second gap with the solder strip on the battery string.

[0007] Optionally, the thickness of the battery cells in the battery string is D, and the thickness of the insulating structure is d, wherein 0.6 ≤ d / D ≤ 2.

[0008] Optionally, the insulating layer is an insulating and light-transmitting layer, so that at least part of the light passes through the insulating and light-transmitting layer to illuminate the battery string.

[0009] Optionally, the insulating and light-transmitting layer is selected from one or more of polyethylene terephthalate, polycarbonate, and polystyrene layers.

[0010] Optionally, in the thickness direction of the insulating light-transmitting layer, the insulating light-transmitting layer has a light-incoming surface facing the first cover plate and a light-outcoming surface facing away from the first cover plate; wherein, at least one of the light-incoming surface and the light-outcoming surface is provided with a first adhesive film layer; and / or, at least one of the light-incoming surface and the light-outcoming surface is coated with a fluorocarbon layer.

[0011] Optionally, the insulating structure further includes a reflective structure disposed on the light-emitting path of the light-emitting surface.

[0012] Optionally, the first encapsulating film is selected from one or more of EVA film, POE film, optical transfer film, and stop film; and / or, the second encapsulating film is selected from one or more of EVA film, POE film, optical transfer film, and stop film.

[0013] Optionally, each of the battery strings includes a plurality of battery cells arranged side by side along a second direction perpendicular to the first direction and connected in series by solder strips; wherein the ends of two adjacent battery cells are superimposed on each other in the second direction; and / or, each battery cell has a front facing the first cover plate and a back facing the second cover plate, at least one of the front and the back being provided with a second adhesive film layer.

[0014] Optionally, the photovoltaic module further includes a first busbar extending along the first direction and disposed on the back of the battery string group. The first busbar is used to connect to a plurality of battery strings. The first busbar has a flat plate portion that adheres to the back of the battery cell of the corresponding battery string and a protruding portion of the solder strip that adheres to the back of the battery cell of the corresponding battery string.

[0015] Optionally, the battery string groups are arranged in two groups along a second direction perpendicular to the first direction, and the solder strips on adjacent cells of two adjacent battery strings in the second direction are connected by a second busbar.

[0016] A second aspect of this disclosure provides a photovoltaic system comprising the photovoltaic modules provided in the first aspect.

[0017] Through the aforementioned technical solution, namely the photovoltaic module provided in this disclosure, the photovoltaic module forms an overlapping area by stacking the edges of two adjacent cell strings in a first direction. That is, it can be understood that by designing a negative spacing between two adjacent cell strings, the gaps between the cell strings can be eliminated, facilitating full-screen arrangement of the photovoltaic module, reducing or even eliminating blank area, increasing the effective cell area, and thus improving the module efficiency. Furthermore, since the overlapping area formed by the stacked edges of two adjacent cell strings is provided with an insulating structure separating the edges of the two adjacent cell strings, the possibility of short circuits after the cell strings are stacked can be reduced, improving the safety of the photovoltaic module. In addition, by setting the melting temperature of the insulating layer of the insulating structure to be higher than the melting temperature of the first encapsulating film and the second encapsulating film, the possibility of melting and flow of the insulating layer during the photovoltaic module encapsulation lamination process can be reduced, achieving stable isolation of the insulating structure at the overlapping area of ​​the edges of two adjacent cell strings, thus contributing to improved safety and reliability of the photovoltaic module.

[0018] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of a photovoltaic module provided in the first embodiment of this disclosure;

[0021] Figure 2 This is a schematic diagram of a photovoltaic module provided in the second embodiment of this disclosure;

[0022] Figure 3 This is a schematic diagram of a photovoltaic module provided in the third embodiment of this disclosure;

[0023] Figure 4 This is a schematic diagram of a photovoltaic module provided in the fourth embodiment of this disclosure;

[0024] Figure 5 This is a schematic diagram of the insulation structure provided in an exemplary embodiment of this disclosure;

[0025] Figure 6 This is a schematic diagram of a first busbar connected to multiple battery strings according to a first embodiment of this disclosure;

[0026] Figure 7This is a schematic diagram of a first busbar connected to multiple battery strings according to the second embodiment of this disclosure;

[0027] Figure 8 This is a schematic diagram of the battery cell provided in the first embodiment of this disclosure;

[0028] Figure 9 This is a schematic diagram of a battery cell provided in the second embodiment of this disclosure.

[0029] Explanation of reference numerals in the attached figures

[0030] 1-First cover plate; 2-First encapsulating film; 3-Battery unit; 310-Battery string; 311-Battery string; 3111-Battery cell; 312-Overlapping area; 313-Insulating structure; 3131-First insulating section; 3132-Second insulating section; 3133-Insulating light-transmitting layer; 3134-Light-incoming surface; 3135-Light-outcoming surface; 3136-First encapsulating film layer; 3137-Reflective structure; 3138-Insulating layer; 314-Solder ribbon; 315-Second encapsulating film layer; 4-Second encapsulating film; 5-Second cover plate; 6-First busbar; 610-Plate portion; 620-Protrusion portion; 7-Second busbar. Detailed Implementation

[0031] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0032] In this disclosure, unless otherwise stated, "inner" and "outer" refer to the inner and outer contours relative to the outline of the component or structure itself. Furthermore, it should be noted that terms such as "first" and "second" are used to distinguish one element from another and do not indicate sequence or importance. Additionally, in the description with reference to the accompanying drawings, the same reference numerals in different drawings denote the same elements.

[0033] According to a first aspect of this disclosure, a photovoltaic module is provided, with reference to... Figures 1 to 9 As shown, the photovoltaic module includes a first cover plate 1, a first encapsulating film 2, a battery cell 3, a second encapsulating film 4, and a second cover plate 5 arranged in sequence. The battery cell 3 includes a battery string group 310, which includes a plurality of battery strings 311 arranged along a first direction. The edges of two adjacent battery strings 311 are stacked in the first direction to form an overlapping area 312. The overlapping area 312 is provided with an insulating structure 313 that separates the edges of two adjacent battery strings 311. The insulating structure 313 includes an insulating layer 3138, and the melting temperature of the insulating layer 3138 is greater than the melting temperature of the first encapsulating film 2 and the second encapsulating film 4.

[0034] Through the above-described technical solution, namely the photovoltaic module provided in this disclosure, the photovoltaic module forms an overlapping region 312 by stacking the edges of two adjacent cell strings 311 in a first direction. That is, it can be understood that by designing a negative spacing between two adjacent cell strings 311, the gaps between the cell strings 311 can be eliminated, which helps to achieve full-screen arrangement of the photovoltaic module, reduces or even eliminates the blank area of ​​the module, increases the effective cell area, and thus improves the module efficiency. Furthermore, since the overlapping region 312 formed by the stacking edges of two adjacent cell strings 311 is provided with an insulating structure 313 separating the edges of the two adjacent cell strings 311, the insulating structure 313 reduces the possibility of short circuits after the edges of the cell strings 311 are stacked, improving the safety of the photovoltaic module. In addition, by setting the melting temperature of the insulating layer 3138 of the insulating structure 313 to be greater than the melting temperature of the first encapsulating film 2 and the second encapsulating film 4, the possibility of melting and flowing of the insulating layer 3138 of the insulating structure 313 during the encapsulation lamination process of the photovoltaic module can be reduced. This achieves the goal of stably blocking the insulating structure 313 at the edge overlap area 312 of the two adjacent cell strings 311, which helps to improve the safety and reliability of the photovoltaic module.

[0035] It is understood that during the encapsulation lamination process of photovoltaic modules, for example, the first encapsulating film 2 and the second encapsulating film 4 will be heated and become molten, so that the molten encapsulating film can flow and fill the gap between the first cover plate 1, the battery cell 3 and the second cover plate 5, thereby encapsulating the photovoltaic module. Therefore, by constructing the melting temperature of the insulating layer 3138 of the insulating structure 313 to be greater than the melting temperature of the first encapsulating film 2 and the second encapsulating film 4, it is possible to ensure that during the photovoltaic module encapsulation lamination process, when for example, the first encapsulating film 2 and the second encapsulating film 4 are heated and become molten, the insulating layer 3138 of the insulating structure 313 remains in a solid state, thereby stably blocking the insulating layer 3138 of the insulating structure 313 at the edge overlap area 312 of the adjacent two battery strings 311, reducing the possibility of short circuits after the edges of the battery strings 311 are stacked, and helping to improve the safety and reliability of the photovoltaic module.

[0036] Furthermore, this disclosure does not specifically limit the specific structure of the first cover plate 1 and the second cover plate 5. Those skilled in the art can design them adaptively according to actual application needs. For example, the first cover plate 1 can be glass, and the second cover plate 5 can also be glass. This disclosure is not limited to this. Its purpose is to achieve the encapsulation of the battery cell 3.

[0037] Furthermore, this disclosure does not specifically limit the particular stacking method of the aforementioned multiple battery strings 311 at their edges to achieve a negative spacing design between the battery strings 311. For example, it can adopt... Figure 1 The stacking method shown in the figure enables the stacking of multiple battery strings 311 at their edges. Alternatively, for example, Figure 2 The stacking method shown enables the stacking of multiple battery strings 311 at their edges. Alternatively, in other alternative embodiments not shown, for example, [the method may be used simultaneously]. Figure 1 and Figure 2 The stacking method shown in the figure enables the stacking of multiple battery strings 311 at their edges. This disclosure is not limited to this. Those skilled in the art can adapt the design according to actual application requirements. The purpose is to achieve a negative spacing design between battery strings 311.

[0038] In some implementations, reference Figures 1 to 4 As shown, in the first direction (refer to...) Figure 2 The width of the insulation structure 313 (in the left and right directions of the middle image) can be greater than the width of the overlapping area 312. This arrangement ensures the insulation design of two adjacent battery strings 311, reduces the possibility of short circuits after the battery strings 311 are stacked at the edges, and improves the safety of the photovoltaic module.

[0039] Exemplarily, in some implementations, reference is made to Figures 1 to 4 As shown, the insulation structure 313 in the first direction may have a first insulation segment 3131 and a second insulation segment 3132 located on both sides of the overlapping area 312 and arranged opposite to each other. Thus, by setting the first insulation segment 3131 and the second insulation segment 3132, it is convenient to realize the insulation design of two adjacent battery strings 311.

[0040] In order to achieve an insulated arrangement of two adjacent battery strings 311 while avoiding the insulation structure 313 occupying a large portion of the light-receiving surface of the battery string 311 (e.g., the front of the battery cell 3111 facing the first cover plate 1 or the back of the second cover plate 5), and to ensure that the module has a high module power, therefore, in some embodiments, such as Figures 1 to 4 As shown, the first insulating segment 3131 can be attached to the corresponding battery string 311 and has a first gap with the solder strip 314 on the battery string 311 (e.g., the solder strip 314 closest to the position of the first insulating segment 3131). In this way, by setting a first gap between the first insulating segment 3131 and the solder strip 314, it is possible to ensure that the two adjacent battery strings 311 are arranged in an insulated manner, while also ensuring that the module has a high module power.

[0041] In addition, in some implementations, such as Figures 1 to 4As shown, the second insulating section 3132 can be attached to the corresponding battery string 311 and has a second gap with the solder strip 314 on the battery string 311 (e.g., the solder strip 314 closest to the position of the second insulating section 3132). In this way, by providing a second gap between the second insulating section 3132 and the solder strip 314, it is easy to ensure the insulation arrangement of two adjacent battery strings 311 while also ensuring that the module has a high module power.

[0042] It should be noted that this disclosure does not specifically limit the specific dimensions of the extension width of the first insulating segment 3131 and the second insulating segment 3132 in the first direction. Those skilled in the art can design it adaptively according to actual application requirements. The purpose is to ensure that a first gap is provided between the first insulating segment 3131 and the solder strip 314, and a second gap is provided between the second insulating segment 3132 and the solder strip 314, so as to ensure that the insulation arrangement of two adjacent battery strings 311 is guaranteed while also ensuring that the module has a high module power.

[0043] For example, in some embodiments, the extension width of the first insulating segment 3131 in the first direction can be 0.25mm-0.5mm, such as 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, etc., to facilitate on-site installation and preparation and to ensure a high production yield. This disclosure is not limited thereto.

[0044] In addition, in some embodiments, the extension width of the second insulating segment 3132 in the first direction can be 0.25mm-0.5mm, for example, the extension width of the second insulating segment 3132 in the first direction can be 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, etc., so as to facilitate on-site installation and preparation and to ensure a high production yield. This disclosure is not limited thereto.

[0045] Furthermore, this disclosure does not specifically limit the specific size value of the width of the overlapping region 312 in the first direction. Those skilled in the art can design it adaptively according to actual application needs. The purpose is to ensure that the multiple battery strings 311 are stably stacked at the edges while also ensuring that the component has high component power. For example, the width of the overlapping region 312 in the first direction can be a, where 0mm < a < 4mm. This disclosure is not limited to this.

[0046] In some embodiments, the thickness of the battery cells 3111 in the battery string 311 can be D, and the thickness of the insulation structure 313 can be d, where 0.6≤d / D≤2. This arrangement facilitates the insulation arrangement of two adjacent battery strings 311 while also making the overall structure of the encapsulated photovoltaic module more compact, thereby improving the performance of the photovoltaic module.

[0047] For example, in some embodiments, the thickness D of the battery cells 3111 of the battery string 311 can be 100μm-150μm, for example, the thickness D of the battery cells 3111 of the battery string 311 can be, for example, 100μm, 120μm, 150μm, etc. In addition, the thickness d of the insulating structure 313 can be 100μm-300μm, for example, the thickness d of the insulating structure 313 can be, for example, 100μm, 150μm, 200μm, 250μm, 300μm, etc. This disclosure is not limited thereto.

[0048] In order to reduce the power loss caused by the installation of the insulation structure 313 and ensure that the module has a high module power, in some embodiments, the insulation layer 3138 can be an insulating light-transmitting layer 3133, so that at least part of the light can pass through the insulating light-transmitting layer 3133 to illuminate the battery string 311. In this way, by constructing the insulation layer 3138 as a light-transmitting material, it is possible to achieve the insulating arrangement of two adjacent battery strings 311 while allowing at least part of the light to pass through the insulating light-transmitting layer 3133 of the insulation structure 313 to illuminate the battery string 311, thereby ensuring that the module has a high module power.

[0049] In this disclosure, the specific material of the insulating light-transmitting layer 3133 is not specifically limited. Those skilled in the art can design it adaptively according to actual application needs. The purpose is to ensure that the insulating light-transmitting layer 3133 has a high transmittance. For example, the transmittance of the insulating light-transmitting layer 3133 can be made above 95% so that more light can pass through the insulating light-transmitting layer 3133 of the insulating structure 313 to irradiate the battery string 311, thereby ensuring that the module has a high module power.

[0050] In addition, it is understood that the above-mentioned insulating layer 3138 can also be, for example, an insulating reflective layer. This disclosure is not limited to this. Its purpose is to stably block the insulating layer 3138 of the insulating structure 313 at the edge overlap area 312 of the two adjacent battery strings 311, thereby reducing the possibility of short circuit after the edges of the battery strings 311 are stacked. Those skilled in the art can design it adaptively according to actual application requirements.

[0051] Exemplarily, in some embodiments, the insulating light-transmitting layer 3133 may be selected from one or more of polyethylene terephthalate (PET), polycarbonate (PC), and polystyrene (PS) layers. This arrangement facilitates the transmission of more light through the insulating light-transmitting layer 3133 of the insulating structure 313 to the battery string 311, thereby ensuring high module power while also achieving an insulated arrangement between adjacent battery strings 311. This disclosure is not limited thereto.

[0052] In addition, in some embodiments, the first encapsulating film 2 may be selected from one or more of EVA film, POE film, light transfer film, and cut-off film, so as to achieve encapsulation and protection of the photovoltaic module, with high reliability, and to achieve the purpose of stable operation of the photovoltaic module. This disclosure is not limited thereto.

[0053] Furthermore, in some embodiments, the second encapsulating film 4 can be selected from one or more of EVA film, POE film, light transfer film, and cut-off film, which facilitates the encapsulation and protection of photovoltaic modules, provides high reliability, and enables stable operation of photovoltaic modules. This disclosure is not limited thereto.

[0054] It should be noted that, since the aforementioned polyethylene terephthalate (PET), polycarbonate (PC), and polystyrene (PS) layers all have high insulation and light transmittance properties, they can ensure that the module has high power while also achieving an insulated arrangement of two adjacent cell strings 311. Furthermore, since the aforementioned polyethylene terephthalate (PET), polycarbonate (PC), and polystyrene (PS) layers all have high melting temperatures, the melting temperature of the insulating layer 3138 can be configured to be higher than that of the first encapsulating film 2 and the second encapsulating film 4. This reduces the possibility of melting and flow of the insulating layer 3138 in the insulating structure 313 during the photovoltaic module encapsulation lamination process, and stably blocks the insulating structure 313 at the edge overlap area 312 of the two adjacent cell strings 311, which helps to improve the safety and reliability of the photovoltaic module.

[0055] In some implementations, reference Figures 1 to 5As shown, in the thickness direction of the insulating light-transmitting layer 3133, the insulating light-transmitting layer 3133 may have a light-entry surface 3134 facing the first cover plate 1 and a light-exit surface 3135 away from the first cover plate 1, so as to enable at least part of the light to pass through the insulating light-transmitting layer 3133 and irradiate the battery string 311. At least one of the light-incoming surface 3134 and the light-outgoing surface 3135 may be provided with a first encapsulating film layer 3136. Thus, by providing the first encapsulating film layer 3136, for example, when the first encapsulating film layer 3136 is constructed as an EVA film, it can buffer and protect the insulating and light-transmitting layer 3133. During the encapsulation and lamination process of photovoltaic modules, the first encapsulating film layer 3136, for example, constructed as an EVA film, can be heated and melted to fill the cell 3111, reducing the possibility of cell 3111 cracking. This results in high reliability. Furthermore, since the melting temperature of the insulating layer 3138 is constructed to be higher than the melting temperature of the first encapsulating film layer 3136, for example, constructed as an EVA film, it can also stably block the insulating layer 3138 of the insulating structure 313 at the edge overlap area 312 of two adjacent cell strings 311, reducing the possibility of short circuits after the edges of the cell strings 311 are stacked, thus helping to improve the safety and reliability of photovoltaic modules.

[0056] It should be noted that the above exemplary description uses the first surface of the insulating light-transmitting layer 3133 facing the first cover plate 1 as the light-entry surface 3134 and the second surface of the insulating light-transmitting layer 3133 facing away from the first cover plate 1 (or it can also be understood as facing the second cover plate 5) as the light-exit surface 3135. It is understood that in some alternative embodiments, the first surface of the insulating light-transmitting layer 3133 facing the first cover plate 1 can also be understood as the light-exit surface, and the second surface of the insulating light-transmitting layer 3133 facing away from the first cover plate 1 can also be understood as the light-entry surface. This disclosure does not specifically limit this.

[0057] Furthermore, in some embodiments, considering that when the first encapsulating film 2 and the second encapsulating film 4 include, for example, an EVA film or a POE film, the EVA film or POE film has a weak ability to block, for example, ultraviolet rays. Thus, when the insulating light-transmitting layer 3133 includes a light-transmitting material such as a polyethylene terephthalate (PET) layer, there is a risk that the PET layer will yellow and become embrittled under ultraviolet radiation, affecting the light transmittance and reliability of the insulating structure 313 and the efficiency of the module. Therefore, in some embodiments, at least one of the light-incoming surface 3134 and the light-outcoming surface 3135 can be coated with a fluorocarbon layer. With this arrangement, since the fluorocarbon layer can effectively block, for example, ultraviolet rays from reaching the insulating light-transmitting layer 3133, the risk of yellowing and embrittlement of the insulating light-transmitting layer 3133 (e.g., the PET layer) can be reduced, which is beneficial to improving the weather resistance of the insulating light-transmitting layer 3133 (e.g., the PET layer), increasing its service life, and helping to improve the reliability and power of the photovoltaic module.

[0058] It should be noted that when, for example, the first encapsulating film 2 and the second encapsulating film 4 include, for example, a light transfer film or a stop film, since both the light transfer film and the stop film have good UV blocking capabilities, considering the need to simplify the fabrication process of the insulating structure 313, the light-incoming surface 3134 and the light-outcoming surface 3135 of the insulating light-transmitting layer 3133 may not require a fluorocarbon coating. Because both the light transfer film and the stop film have good UV blocking capabilities, the risk of yellowing and embrittlement of the insulating light-transmitting layer 3133 (e.g., the PET layer) can be effectively reduced. This disclosure is not limited thereto.

[0059] In addition, when the first adhesive film layer 3136 and the fluorocarbon layer are provided simultaneously, the fluorocarbon layer can be placed between the first adhesive film layer 3136 and the insulating and light-transmitting layer 3133, so as to achieve protection of the insulating and light-transmitting layer 3133 through the fluorocarbon layer, and reduce the risk of yellowing and embrittlement of the insulating and light-transmitting layer 3133 (e.g., PET layer).

[0060] Furthermore, in some implementations, references Figures 1 to 5 As shown, the insulating structure 313 may further include a reflective structure 3137, which is disposed on the light emission path of the light-emitting surface 3135, for example, as shown in the reference. Figure 5 As shown, the reflective structure 3137 may include a reflective coating disposed on the light-emitting surface 3135 of the insulating light-transmitting layer 3133. Thus, the reflective coating facilitates the reflection of some light passing through the insulating light-transmitting layer 3133 onto, for example, the surface of the battery cell 3111 facing the insulating structure 313, so as to improve the back power of the module and help to improve, for example, the bifaciality of the module, thereby achieving the purpose of improving the module power.

[0061] It should be noted that the specific embodiment in which the reflective structure 3137 may include a reflective coating disposed on the light-emitting surface 3135 of the insulating light-transmitting layer 3133 is exemplary. In other alternative embodiments, the reflective structure 3137 may also include, for example, a physical reflection structure (e.g., a physical reflection strip) disposed on the light-emitting surface 3135 of the insulating light-transmitting layer 3133. This disclosure does not specifically limit such variations; the purpose is simply to improve the power of the component. Furthermore, this disclosure does not specifically limit the specific structure and material of the reflective structure 3137, such as the specific structure and material of the reflective coating and the physical reflection structure. Those skilled in the art can design it adaptively according to actual application requirements.

[0062] Furthermore, it is understood that the reflective structure 3137 may not be directly connected to the insulating structure 313. For example, in some alternative embodiments not shown, the reflective structure 3137 may also be arranged on a second cover plate 5, for example, arranged facing the light-emitting surface 3135 of the insulating light-transmitting layer 3133. This disclosure is not limited to this. The purpose is to enable the reflective structure 3137 to reflect back the light that is not fully utilized by the battery cell 3111 back to the battery cell 3111, thereby achieving the purpose of fully utilizing the light.

[0063] In some implementations, reference Figure 8 and Figure 9 As shown, each battery string 311 may include multiple battery cells 3111 arranged side by side along a second direction perpendicular to the first direction and connected in series by solder strips 314. In the second direction, the ends of two adjacent battery cells 3111 are superimposed on each other. Thus, by designing a negative spacing between two adjacent battery cells 3111 and by cooperating with the negative spacing design between two adjacent battery strings 311, it is easy to achieve full-screen arrangement of photovoltaic modules, reduce or even eliminate blank area of ​​the module, increase effective battery cell area, and thus effectively improve the module efficiency of photovoltaic modules.

[0064] Alternatively, in some implementations, reference is made to Figure 3 and Figure 4 As shown, each solar cell 3111 has a front side facing the first cover plate 1 and a back side facing the second cover plate 5. At least one of the front and back sides is provided with a second adhesive film layer 315. Thus, by providing the second adhesive film layer 315, for example, when the second adhesive film layer 315 is constructed as an EVA film, the solar cell 3111 can be buffered and protected by the second adhesive film layer 315. At the same time, during the encapsulation and lamination process of photovoltaic modules, the second adhesive film layer 315, for example, constructed as an EVA film, can be heated and melted to fill the solar cell 3111, reducing the possibility of solar cell 3111 cracking and improving reliability.

[0065] It should be noted that the reference Figure 3 and Figure 4 As shown, when the surface of the battery cell 3111 is provided with the above-mentioned EVA film, during the encapsulation lamination process of the photovoltaic module, the first encapsulation film 2 and the second encapsulation film 4 can be integrated with the second film layer 315, which is constructed as an EVA film. This enables the molten encapsulation film and the second film layer 315 to flow and fully fill the gap between the first cover plate 1, the battery cell 3 and the second cover plate 5, thereby achieving the encapsulation of the photovoltaic module with good sealing performance and high encapsulation yield.

[0066] Additionally, in some implementations, references Figure 6 and Figure 7 As shown, the photovoltaic module may further include a first busbar 6 extending along a first direction and disposed on the back of the cell string group 310. The first busbar 6 is used to connect to multiple cell strings 311. The first busbar 6 has a flat plate portion 610 that adheres to the back of the cell sheet 3111 of the corresponding cell string 311, and a protrusion 620 that adheres to the solder strip 314 on the back of the cell sheet 3111 of the corresponding cell string 311. This arrangement facilitates the tight bonding and connection of the first busbar 6 to the multiple cell strings 311, resulting in high reliability. Furthermore, by disposing of the first busbar 6 on the back of the cell string group 310, the first busbar 6 can be prevented from obscuring the light-receiving surface of the photovoltaic module, thereby affecting the light-receiving area of ​​the photovoltaic module, which is beneficial to ensuring that the photovoltaic module has a high module power.

[0067] It should be noted that this disclosure does not specifically limit the particular arrangement of the first busbar 6 for connecting multiple battery strings 311. For example, it can be implemented using... Figure 6 The arrangement shown connects the first busbar 6 to multiple battery strings 311; alternatively, for example, it can also be used. Figure 7 The arrangement shown in the figure enables the first busbar 6 to be connected to multiple battery strings 311. This disclosure is not limited to this. Those skilled in the art can design it adaptively according to actual application needs. The purpose is to enable multiple battery strings 311 to be connected through the first busbar 6.

[0068] Furthermore, the aforementioned first busbar 6 can divide the battery cell 3 into multiple battery sub-regions (not shown). By providing a bypass protection device (such as, but not limited to, diodes not shown) in each battery sub-region, the corresponding battery sub-region can be protected. For example, when a local fault occurs in the battery cell 3, such as uneven illumination, partial shading, or performance degradation in a certain battery sub-region, the bypass protection device can be turned on in time, allowing the current to bypass the fault area, thereby preventing the entire battery cell 3 from failing due to a local fault. This greatly improves the fault tolerance of the battery cell 3, ensures the normal operation of the battery cell 3 under various complex working conditions, extends the service life of the photovoltaic module, and helps to improve the safety of the photovoltaic module. The specific arrangement of the aforementioned first busbar 6 to form multiple battery sub-regions and the specific connection form of the bypass protection device are not specifically limited in this disclosure. Those skilled in the art can design them adaptively according to actual application needs.

[0069] In some implementations, reference Figure 9 As shown, the battery string groups 310 along the second direction perpendicular to the first direction can be arranged into two groups, and the solder strips 314 on the two adjacent cells 3111 of the two adjacent battery strings 311 in the second direction are connected by the second busbar 7. This arrangement allows the two adjacent battery strings 311 in each of the two battery string groups 310 connected in series or parallel through the second busbar 7 in the second direction to be designed with a negative spacing, so as to eliminate the gap between the battery strings 311. This helps to achieve full-screen arrangement of photovoltaic modules, reduce or even eliminate the blank area of ​​the module, increase the effective cell area, and thus improve the module efficiency of photovoltaic modules.

[0070] It should be noted that the reference Figure 9 As shown, in the second direction, for example, when two battery string groups 310 are connected in parallel via the second busbar 7, the insulation structure 313 can be disconnected at, for example, the second busbar 7, while in, for example... Figure 8 In the pure series circuit shown, the insulation structure 313 may be designed without being disconnected, for example, at the busbar. This disclosure does not specifically limit this, and those skilled in the art can design it adaptively according to the actual application requirements.

[0071] According to a second aspect of this disclosure, a photovoltaic system is provided, comprising the photovoltaic module provided in the first aspect. This photovoltaic system possesses all the beneficial effects of the photovoltaic module provided in the first aspect, which will not be elaborated further herein.

[0072] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0073] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0074] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A photovoltaic module, characterized in that, The photovoltaic module includes a first cover plate, a first encapsulating film, a battery cell, a second encapsulating film, and a second cover plate arranged in sequence. The battery unit includes a battery string group, which includes multiple battery strings arranged along a first direction. The edges of two adjacent battery strings are stacked in the first direction to form an overlapping area. The overlapping area is provided with an insulating structure that separates the edges of two adjacent battery strings. The insulating structure includes an insulating layer, the melting temperature of which is greater than the melting temperatures of the first encapsulating film and the second encapsulating film.

2. The photovoltaic module according to claim 1, characterized in that, In the first direction, the width of the insulating structure is greater than the width of the overlapping region.

3. The photovoltaic module according to claim 2, characterized in that, The insulating structure in the first direction has a first insulating segment and a second insulating segment located on both sides of the overlapping region and arranged opposite to each other; Wherein, the first insulating segment is attached to the corresponding battery string and has a first gap with the solder strip on the battery string; and / or, The second insulating segment is attached to the corresponding battery string and has a second gap with the solder strip on the battery string.

4. The photovoltaic module according to claim 1, characterized in that, The thickness of the battery cells in the battery string is D, and the thickness of the insulating structure is d, where 0.6 ≤ d / D ≤ 2.

5. The photovoltaic module according to any one of claims 1-4, characterized in that, The insulating layer is an insulating and light-transmitting layer, so that at least part of the light passes through the insulating and light-transmitting layer to illuminate the battery string.

6. The photovoltaic module according to claim 5, characterized in that, The insulating and light-transmitting layer is selected from one or more of polyethylene terephthalate, polycarbonate, and polystyrene layers.

7. The photovoltaic module according to claim 5, characterized in that, In the thickness direction of the insulating light-transmitting layer, the insulating light-transmitting layer has a light-incoming surface facing the first cover plate and a light-outcoming surface facing away from the first cover plate; Wherein, at least one of the light-incoming surface and the light-outgoing surface is provided with a first adhesive film layer; and / or, At least one of the light-incoming surface and the light-outgoing surface is coated with a fluorocarbon layer.

8. The photovoltaic module according to claim 7, characterized in that, The insulating structure also includes a reflective structure, which is disposed on the light-emitting path of the light-emitting surface.

9. The photovoltaic module according to claim 1, characterized in that, The first encapsulating film is selected from one or more of EVA film, POE film, optical transfer film, and cut-off film; and / or, The second encapsulating film is selected from one or more of EVA film, POE film, optical transfer film, and cut-off film.

10. The photovoltaic module according to claim 1, characterized in that, Each of the battery strings includes a plurality of battery cells arranged side by side along a second direction perpendicular to the first direction and connected in series by solder strips; Wherein, in the second direction, the ends of two adjacent battery cells overlap each other; and / or, Each of the battery cells has a front side facing the first cover plate and a back side facing the second cover plate, and at least one of the front side and the back side is provided with a second adhesive film layer.

11. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module further includes a first busbar extending along the first direction and disposed on the back of the battery string group. The first busbar is used to connect to a plurality of battery strings. The first busbar has a flat plate portion that adheres to the back of the battery cell of the corresponding battery string and a protruding portion of the solder strip that adheres to the back of the battery cell of the corresponding battery string.

12. The photovoltaic module according to claim 1, characterized in that, The battery string groups are arranged in two groups along a second direction perpendicular to the first direction, and the solder strips on the adjacent cells of two adjacent battery strings in the second direction are connected by a second busbar.

13. A photovoltaic system, characterized in that, The photovoltaic system includes the photovoltaic module as described in any one of claims 1-12.

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