Photovoltaic cell, photovoltaic module and photovoltaic system

Abstract

The utility model discloses a photovoltaic cell, a photovoltaic assembly and a photovoltaic system. The photovoltaic cell comprises a front cover plate, a back cover plate, a photovoltaic cell layer and a connecting assembly. At least one through hole is formed in the back cover plate; the photovoltaic cell layer is arranged between the front cover plate and the back cover plate; the connecting assembly comprises an insulating part and a conductive connecting part, the conductive connecting part is arranged in the insulating part, the insulating part is arranged at the through hole, and the photovoltaic cell layer is electrically connected with the conductive connecting part. The structure strength of the back cover plate can be improved, stress concentration at the through holes is avoided, the risk of explosion of the back cover plate is reduced, the safety and reliability of the photovoltaic cell are improved, the adhesive film is prevented from overflowing from the through holes, bubbles are prevented from being generated at the through holes, current on the photovoltaic cell layer can be fully transmitted to an external assembly through the conductive connecting piece, and the service life of the photovoltaic cell layer is prolonged. And the working efficiency of the photovoltaic cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of solar photovoltaic, in particular to a photovoltaic cell, a photovoltaic module and a photovoltaic system. Background Art

[0002] In the prior art, glue overflows at the position of the central hole of the double-glass module, and it is easy to lack glue inside the module; it is not convenient to pass out the lead wire or bend the lead wire, and the junction box is prone to poor soldering; stress concentration occurs at the central hole, and the component load is prone to failure. The bus bar needs to be welded to the components inside the junction box, and the processing is complex. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide a photovoltaic cell, which can improve the reliability of the photovoltaic system and reduce the production cost.

[0004] The second object of the utility model is to provide a photovoltaic module, including the photovoltaic cell and the junction box described in the above embodiments.

[0005] The third object of the utility model is to provide a photovoltaic system, including the photovoltaic module described in the above embodiments.

[0006] The photovoltaic cell according to the first aspect embodiment of the utility model includes: a front cover plate, a back cover plate, a photovoltaic cell layer and a connection assembly. At least one through hole is formed in the back cover plate; the photovoltaic cell layer is arranged between the front cover plate and the back cover plate; the connection assembly includes an insulating member and a conductive connecting member. The conductive connecting member is arranged inside the insulating member, the insulating member is arranged at the through hole, and the photovoltaic cell layer is electrically connected to the conductive connecting member.

[0007] The photovoltaic cell according to the embodiment of the utility model can improve the structural strength of the back cover plate, avoid stress concentration at the through hole, reduce the risk of the back cover plate bursting, improve the safety and reliability of the photovoltaic cell, and at the same time prevent the glue film from overflowing from the through hole and avoid generating bubbles at the through hole. At the same time, the current on the photovoltaic cell layer can be fully transmitted to the external components through the conductive connecting member, improving the working efficiency of the photovoltaic cell.

[0008] In some embodiments, the insulating member is formed with a first mounting hole and a second mounting hole, and the conductive connecting members are respectively arranged in the first mounting hole and the second mounting hole. The photovoltaic cell layer is electrically connected to the conductive connecting members in the first mounting hole and the second mounting hole respectively.

[0009] In some embodiments, the photovoltaic cell further includes: a plurality of busbars, one ends of the plurality of busbars are respectively electrically connected to the photovoltaic cell layer, and the other ends of the plurality of busbars are respectively electrically connected to the conductive connectors disposed in the first mounting hole and the second mounting hole.

[0010] In some embodiments, the other ends of the plurality of busbars respectively abut against the conductive connectors in the first mounting hole and the second mounting hole; or the conductive connectors in the first mounting hole and the second mounting hole at least cover at least a part of the corresponding conductive connectors among the plurality of busbars.

[0011] In some embodiments, the conductive connector is a flexible member.

[0012] A photovoltaic module according to an embodiment of the second aspect of the present invention includes: a photovoltaic cell and a junction box, the photovoltaic cell is the photovoltaic cell in any one of the above embodiments of the first aspect; the junction box is disposed on a side of the back cover plate of the photovoltaic cell away from the front cover plate, and the junction box is electrically connected to the connection assembly of the photovoltaic cell.

[0013] In some embodiments, the junction box includes: a housing and a control board, the control board is disposed in the housing, the control board is provided with a first connector and a second connector, the first connector and the second connector abut against the conductive connectors of the photovoltaic cell, and the first connector and the second connector have opposite polarities.

[0014] In some embodiments, the first connector and the second connector and the control board are integrally formed.

[0015] In some embodiments, the first connector and the second connector are elastic members.

[0016] A photovoltaic system according to an embodiment of the third aspect of the present invention includes the photovoltaic module in any one of the above embodiments of the second aspect.

[0017] The additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0019] Figure 1 is a schematic diagram of a photovoltaic module according to an embodiment of the second aspect of the present invention;

[0020] Figure 2 isFigure 1 Schematic diagram of the enlarged P region.

[0021] Reference numerals:

[0022] 100. Photovoltaic modules;

[0023] 10. Front cover;

[0024] 20. Back cover;

[0025] 30. Photovoltaic cell layer;

[0026] 40. Connecting assembly; 41. Insulating member; 42. Conductive connecting member;

[0027] 50. bus bar; 51. first bending portion; 52. second bending portion;

[0028] 60. Junction box; 61. Shell; 62. Control board; 63. First connecting member; 64. Second connecting member; 65. Third bending portion; 66. Fourth bending portion. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1 - Figure 2 The photovoltaic cell according to the embodiment of the present utility model is described, including: a front cover plate 10 , a back cover plate 20 , a photovoltaic cell layer 30 and a connection component 40 .

[0030] Specifically, if Figure 1 and Figure 2 As shown, the back cover plate 20 is formed with at least one through hole; the photovoltaic cell layer 30 is arranged between the front cover plate 10 and the back cover plate 20; the connecting component 40 includes an insulating member 41 and a conductive connecting member 42, the conductive connecting member 42 is arranged in the insulating member 41, the insulating member 41 is arranged at the through hole, and the photovoltaic cell layer 30 is electrically connected to the conductive connecting member 42.

[0031] The photovoltaic cell includes a front cover plate 10 and a back cover plate 20, a photovoltaic cell layer 30 disposed between the front cover plate 10 and the back cover plate 20, and an EVA film layer disposed between the photovoltaic cell layer 30 and the front cover plate 10, and between the photovoltaic cell layer 30 and the back cover plate 20. The front cover plate 10 and the back cover plate 20 are both transparent glass plates. A through hole is disposed on the back cover plate 20, and the through hole penetrates the back cover plate 20 along the thickness direction of the photovoltaic cell. The through hole is suitable for cooperating with the insulating member 41 of the connecting component 40, the insulating member 41 is disposed at the through hole, and the conductive connecting member 42 cooperates with the through hole. The photovoltaic cell layer 30 is suitable for forming an electrical connection with the conductive connecting member 42 of the connecting component 40, so as to conduct the current collected by the photovoltaic cell layer 30.

[0032] In this embodiment, the front cover plate 10 and the back cover plate 20 are transparent glass plates. For example, when the photovoltaic cell is irradiated by sunlight, some light will be reflected by the surrounding environment to the back cover plate 20, so that both the front cover plate 10 and the back cover plate 20 can generate electricity, improving the power generation efficiency of the photovoltaic cell. That is, the photovoltaic cell in this embodiment is a photovoltaic cell for a double-glass module.

[0033] For the photovoltaic cell according to the embodiment of the present invention, at least one through hole is formed in the back cover plate 20, and the insulating member 41 is disposed at the through hole. The photovoltaic cell layer 30 is electrically connected to the conductive connecting member 42, which can improve the structural strength of the back cover plate 20, avoid stress concentration at the through hole, reduce the risk of bursting of the back cover plate 20, improve the safety and reliability of the photovoltaic cell, and at the same time prevent the glue film from overflowing from the through hole and avoid generating bubbles at the through hole. At the same time, the current on the photovoltaic cell layer 30 can be fully transmitted to the external component through the conductive connecting member 42, improving the working efficiency of the photovoltaic cell.

[0034] According to some embodiments of the present invention, as Figure 2 shown, the insulating member 41 is formed with a first mounting hole and a second mounting hole, and conductive connecting members 42 are respectively disposed in the first mounting hole and the second mounting hole. The photovoltaic cell layer 30 is electrically connected to the conductive connecting members 42 in the first mounting hole and the second mounting hole respectively.

[0035] That is, a first mounting hole and a second mounting hole are formed in the insulating member 41 and penetrate the insulating member 41 along the thickness direction of the photovoltaic cell. The first mounting hole and the second mounting hole are spaced apart on the insulating member 41. The conductive connecting member 42 includes a first conductive connecting member 42 and a second conductive connecting member 42, and the first conductive connecting member 42 and the second conductive connecting member 42 are respectively in tight fit with the first mounting hole and the second mounting hole. The photovoltaic cell layer 30 is respectively electrically connected to the first conductive connecting member 42 and the second conductive connecting member 42. That is, the photovoltaic cell has a positive electrode lead-out end and a negative electrode lead-out end, and the first conductive connecting member 42 and the second conductive connecting member 42 are respectively electrically connected to the positive electrode lead-out end and the negative electrode lead-out end.

[0036] Thus, the photovoltaic cell layer 30 is electrically connected to the conductive connecting members 42 in the first mounting hole and the second mounting hole respectively, which can avoid the first conductive connecting member 42 and the second conductive connecting member 42 from contacting each other to cause a short circuit, and smoothly lead out the positive current and negative current generated on the photovoltaic cell.

[0037] According to some embodiments of the present invention, as Figure 2 shown, the photovoltaic cell further includes: a plurality of bus bars 50. One ends of the plurality of bus bars 50 are respectively electrically connected to the photovoltaic cell layer 30, and the other ends of the plurality of bus bars 50 are respectively electrically connected to the conductive connecting members 42 disposed in the first mounting hole and the second mounting hole.

[0038] That is, the multiple busbars 50 include a first busbar 50 and a second busbar 50. One end of the first busbar 50 and one end of the second busbar 50 are respectively disposed at two ends of the photovoltaic cell layer 30. The other end of the first busbar 50 and the other end of the second busbar 50 respectively extend along the length direction of the photovoltaic cell and towards each other, and are respectively bent towards the through hole along the thickness direction of the photovoltaic cell to form a first bent portion 51 and a second bent portion 52. Moreover, the thicknesses of the first bent portion 51 and the second bent portion 52 are both smaller than the thickness of the back cover plate 20, so that the first bent portion 51 and the second bent portion 52 are respectively located in the first mounting hole and the second mounting hole, preventing the bent portions from penetrating through the back cover plate 20. The first bent portion 51 and the second bent portion 52 are respectively electrically connected to the first conductive connector 42 and the second conductive connector 42. Here, the first busbar 50 is the positive electrode lead-out end of the photovoltaic cell, and the second busbar 50 is the negative electrode lead-out end of the photovoltaic cell.

[0039] Thus, one ends of the multiple busbars 50 are respectively electrically connected to the photovoltaic cell layer 30, and the other ends of the multiple busbars 50 are respectively electrically connected to the conductive connectors 42 disposed in the first mounting hole and the second mounting hole. The current on the photovoltaic cell layer 30 can be centrally transmitted to the conductive connectors 42 through the busbars 50 for export. While improving the energy utilization rate, the current balance on the photovoltaic cell layer 30 can be achieved.

[0040] According to some embodiments of the present invention, as Figure 2 shown, the other ends of the multiple busbars 50 respectively abut against the conductive connectors 42 in the first mounting hole and the second mounting hole; or the conductive connectors 42 in the first mounting hole and the second mounting hole at least cover at least part of the corresponding conductive connectors 42 among the multiple busbars 50.

[0041] In this embodiment, at least part of the first bent portion 51 of the first busbar 50 and at least part of the second bent portion of the second busbar 50 are respectively inserted into the first conductive connector 42 and the second conductive connector 42. That is, the first conductive connector 42 forms a wrapping of at least part of the first bent portion 51, and the second conductive connector 42 forms a wrapping of at least part of the second bent portion 52, so that good contact can be achieved between the conductive connector 42 and the bent portion. Optionally, the first bent portion 51 of the first busbar 50 and the second bent portion 52 of the second busbar 50 can respectively abut against one side of the first conductive connector 42 and the second conductive connector 42 adjacent to the front cover plate 10. That is, the first bent portion 51 and the second bent portion 52 extend into the corresponding mounting holes and abut against the conductive connectors 42 in the corresponding mounting holes, so as to facilitate the formation of an electrical connection relationship with the conductive connectors 42.

[0042] Thus, the conductive connectors 42 in the first mounting hole and the second mounting hole at least cover at least part of the conductive connectors 42 corresponding to them in the bus bar 50, or the conductive connectors 42 abut against the corresponding bus bar 50, so that the bus bar 50 and the conductive connectors 42 are in full contact, playing a role of full conductivity and avoiding current loss. At the same time, the connection method between the conductive connectors 42 and the bus bar 50 is simple and convenient, the welding process can be avoided, the assembly efficiency of the photovoltaic cell is improved, and the electrical connection between the conductive connectors 42 and the corresponding bus bar 50 can be better guaranteed.

[0043] According to some embodiments of the present invention, the conductive connector 42 is a flexible member.

[0044] In this embodiment, the conductive connector 42 is made of a flexible conductive material (nano-carbon material). The nano-carbon material has both good flexibility and excellent conductivity, and has good thermal stability, optical transparency, etc.

[0045] Thus, since the conductive connector 42 is a flexible member, the conductivity of the conductive connector 42 can be improved, thereby improving the power generation efficiency of the photovoltaic cell. Since the conductive connector 42 has high thermal stability and optical transparency, the stability of the photovoltaic cell can be improved, the current damage between the bus bar 50 and the conductive connector 42 can be reduced, and it is convenient to be arranged in the first mounting hole and the second mounting hole. At the same time, the first bending portion 51 and the second bending portion 52 of the bus bar 50 can be fixed on the conductive connector 42, which is convenient to form an electrical connection between the bus bar 50 and the conductive connector 42.

[0046] According to the photovoltaic module 100 of the second aspect embodiment of the present invention, as Figure 1 shown, it includes: a photovoltaic cell and a junction box 60. The photovoltaic cell is the photovoltaic cell of any one of the above first aspect embodiments; the junction box 60 is arranged on the side of the back cover plate 20 of the photovoltaic cell away from the front cover plate 10, and the junction box 60 is electrically connected to the connection assembly 40 of the photovoltaic cell.

[0047] That is, the junction box 60 is arranged on the side of the back cover plate 20 of the photovoltaic cell away from the front cover plate 10 along the thickness direction of the photovoltaic cell. The junction box 60 is connected to the back cover plate 20, and the junction box 60 is adapted to form an electrical connection with the first conductive connector 42 and the second conductive connector 42 of the connection assembly 40. Thus, the junction box 60 is arranged on the side of the back cover plate 20 of the photovoltaic cell away from the front cover plate 10 and is electrically connected to the connection assembly 40 of the photovoltaic cell, so that a conductive loop can be formed between the photovoltaic cell layer 30 and the junction box 60, which is convenient to transfer the current collected on the plurality of bus bars 50 to the junction box 60, and is convenient to lead the current to other external components to realize the collection and utilization of the current generated by the photovoltaic cell, simplifies the assembly process of the photovoltaic module 100, and effectively improves the assembly efficiency.

[0048] According to some embodiments of the present utility model, as Figure 1 shown, the junction box 60 includes: a housing 61 and a control board 62. The control board 62 is disposed inside the housing 61. The control board 62 is provided with a first connector 63 and a second connector 64. The first connector 63 and the second connector 64 are in abutment with the conductive connectors 42 of the photovoltaic cell. The first connector 63 and the second connector 64 have opposite polarities.

[0049] That is, the control board 62 is disposed inside the housing 61. The first connector 63 and the second connector 64 provided on the control board 62 both extend along the thickness direction of the photovoltaic cell. The first connector 63 and the second connector 64 respectively correspond to the first conductive connector 42 and the second conductive connector 42. The first connector 63 is electrically connected to the first conductive connector 42 and the first bus bar 50. The second connector 64 is electrically connected to the second conductive connector 42 and the second bus bar 50. Further, third bending portions 65 and fourth bending portions 66 are respectively formed at one ends of the first connector 63 and the second connector 64 adjacent to the through hole along the thickness direction of the photovoltaic cell. The third bending portions 65 and the fourth bending portions 66 are respectively in abutment with the sides of the first conductive connector 42 and the second conductive connector 42 away from the front cover plate 10.

[0050] In this embodiment, the control board 62, the first connector 63, and the second connector 64 inside the junction box 60 can be pre-assembled, and potting glue is filled to achieve insulation between multiple components. One ends of the first connector 63 and the second connector 64 are respectively electrically connected to the control board 62. The first connector 63 and the second connector 64 serve as the positive and negative electrodes of the control board 62. Their free ends, that is, the ends of the first connector 63 and the second connector 64 away from the control board 62, extend out of the junction box 60 and extend out of the side of the junction box 60 adjacent to the back cover plate 20. When the junction box 60 is installed with the photovoltaic cell, the first connector 63 and the second connector 64 of the junction box 60 are directly aligned with the conductive connectors 42 and the junction box 60 is fixed.

[0051] Thus, the first connector 63 and the second connector 64 are in abutment with the conductive connectors 42 of the photovoltaic cell. The first connector 63 and the second connector 64 have opposite polarities. Without welding the bus bar 50 to the first connector 63 and the second connector 64, a conductive circuit can be formed between the bus bar 50, the conductive connector 42, and the control board 62, that is, a conductive circuit can be formed between the photovoltaic cell layer 30 and the junction box 60, avoiding wear between the conductive connector 42 and the first connector 63 and the second connector 64, extending the service life of the junction box 60, simplifying the assembly process of the junction box 60 and the photovoltaic cell, reducing costs, and improving production efficiency.

[0052] According to some embodiments of the present utility model, the first connecting member 63 and the second connecting member 64 are integrally formed with the control board 62.

[0053] In this embodiment, the first connecting member 63 and the second connecting member 64 are manufactured with the control board 62 by an integral forming process without welding, which reduces the processing precision requirements between the first connecting member 63 and the second connecting member 64 and the control board 62. At the same time, through the integral forming processing design between the first connecting member 63 and the second connecting member 64 and the control board 62, the processing technology can be simplified, the connection precision between the first connecting member 63 and the second connecting member 64 and the control board 62 can be improved, the structural strength of the junction box 60 can be enhanced, which is beneficial to reducing the production cost of the junction box 60 and effectively improving the production capacity.

[0054] According to some embodiments of the present utility model, the first connecting member 63 and the second connecting member 64 are elastic members.

[0055] That is, at least the third bending portion 65 included in the first connecting member 63 and the fourth bending portion 66 included in the second connecting member 64 are elastic members with a certain resilience. Thus, the first connecting member 63 and the second connecting member 64 being elastic members can avoid the friction between the first connecting member 63 and the second connecting member 64 and the first conductive connecting member 42 and the second conductive connecting member 42, and avoid the situation that the connecting component 40 falls off from the through hole due to the acting force between the first connecting member 63 and the second connecting member 64 and the connecting component 40, which is convenient for the installation and disassembly of the junction box 60.

[0056] The photovoltaic system according to the third aspect embodiment of the present utility model includes the photovoltaic module 100 according to any one of the second aspect embodiments above.

[0057] According to the photovoltaic system of the present utility model, through the optimization of the photovoltaic module 100, the control board 62 of the junction box 60 and the first connecting member 63 and the second connecting member 64 adopt an integral forming processing method. Without a welding process, the current collected on the bus bar 50 can be led out to the first connecting member 63 and the second connecting member 64, reducing the processing precision requirements of the junction box 60. At the same time, the connecting component 40 is arranged at the through hole of the back cover plate 20 to avoid the overflow of the glue film from the through hole, reducing the production cost and improving the electrical connection precision between the photovoltaic cell and the junction box 60, so that the photovoltaic system with the photovoltaic module 100 has good quality and high processing efficiency, and improves the power generation efficiency of the photovoltaic system.

[0058] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0059] In the description of the present utility model, "the first feature" and "the second feature" may include one or more of such features. In the description of the present utility model, the meaning of "a plurality of" is two or more. In the description of the present utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but in contact through additional features therebetween. In the description of the present utility model, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0060] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0061] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A photovoltaic cell, characterized in that, Comprising: A front cover plate; A back cover plate, at least one through hole being formed in the back cover plate; A photovoltaic cell layer, which is disposed between the front cover plate and the back cover plate; A connection assembly, the connection assembly including an insulating member and a conductive connecting member, the conductive connecting member being disposed within the insulating member, the insulating member being disposed at the through hole, and the photovoltaic cell layer being electrically connected to the conductive connecting member.

2. The photovoltaic cell according to claim 1, characterized in that The insulating member forms a first mounting hole and a second mounting hole, the conductive connecting members being respectively disposed within the first mounting hole and the second mounting hole, and the photovoltaic cell layer being respectively electrically connected to the conductive connecting members within the first mounting hole and the second mounting hole.

3. The photovoltaic cell according to claim 2, characterized in that, Further comprising: A plurality of busbars, one ends of the plurality of busbars being respectively electrically connected to the photovoltaic cell layer, and the other ends of the plurality of busbars being respectively electrically connected to the conductive connecting members disposed within the first mounting hole and the second mounting hole.

4. The photovoltaic cell according to claim 3, characterized in that, The other ends of the plurality of busbars respectively abut against the conductive connecting members within the first mounting hole and the second mounting hole; or, The conductive connecting members within the first mounting hole and the second mounting hole at least cover at least a part of the corresponding conductive connecting members among the plurality of busbars.

5. The photovoltaic cell according to any one of claims 1-4, characterized in that, The conductive connecting member is a flexible member.

6. A photovoltaic module, characterized in that, Comprising: A photovoltaic cell, the photovoltaic cell being the photovoltaic cell according to any one of claims 1-5; A junction box, the junction box being disposed on a side of the back cover plate of the photovoltaic cell away from the front cover plate, and the junction box being electrically connected to the connection assembly of the photovoltaic cell.

7. The photovoltaic module according to claim 6, wherein The junction box includes: A housing; A control board, the control board being disposed within the housing, the control board being provided with a first connecting member and a second connecting member, the first connecting member and the second connecting member abutting against the conductive connecting members of the photovoltaic cell, and the first connecting member and the second connecting member having opposite polarities.

8. The photovoltaic module according to claim 7, characterized in that, The first connecting member and the second connecting member and the control board are integrally formed.

9. The photovoltaic module according to claim 7, wherein, The first connecting member and the second connecting member are elastic members.

10. A photovoltaic system, characterized in that, Comprising the photovoltaic module according to any one of claims 1-9.

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