Solar cell module and photovoltaic system

Abstract

The utility model is applicable to the field of photovoltaic technology, and provides a solar cell module and a photovoltaic system, and the solar cell module comprises a first cell string and a second cell string, and the first cell string and the second cell string are arranged at an interval along a first direction; the plurality of first welding strips extend along the second direction, the first conductive parts are arranged on the first bus bars, the second conductive parts are arranged on the second bus bars, and the positions of the conductive parts on the bus bars can be flexibly arranged, so that enough space is formed between the first conductive parts and the second conductive parts for mounting a junction box; therefore, two types of battery strings do not need to be set and produced, the technological process of battery assembly production is greatly simplified, and the first welding strip at the edge of the first battery string and the second welding strip at the edge of the second battery string can be connected into the junction box through the bus bar and the conductive piece. Carriers at the edge of a cell string can be effectively collected, and the power generation efficiency of the cell assembly is further improved.

Description

Technical Field

[0001] This application belongs to the technical field of photovoltaics, and in particular relates to a solar cell and a photovoltaic system. Background Art

[0002] In the related art, since the existing solder tapes are uniformly arranged on the battery string, the solder tapes at the edge of the battery string are relatively close to the edge of the battery string. After the solder tapes are connected to the busbars, the distance between the busbars is too small to access the junction box. In order to connect the battery string to the junction box, it is usually necessary to produce two types of battery strings (which can also be called string A and string B) to leave enough space to install the junction box. However, the production process of the AB battery strings is relatively complex, which affects the production capacity of the module. Summary of the Utility Model

[0003] This application provides a solar cell, aiming to solve the problem that the production process of the AB battery strings is relatively complex and affects the production capacity of the module.

[0004] This application is implemented as follows. A solar cell module includes a first battery string and a second battery string, and the first battery string and the second battery string are arranged at intervals along a first direction;

[0005] A plurality of first solder tapes, the plurality of first solder tapes extend along a second direction and are arranged at intervals along the first direction on the first battery string, and the polarities of the plurality of first solder tapes are the same;

[0006] A first busbar, and the plurality of first solder tapes are commonly electrically connected to the first busbar;

[0007] A plurality of second solder tapes, the plurality of second solder tapes are arranged at intervals along the first direction on the second battery string, the polarities of the plurality of second solder tapes are the same, and the polarities of the first solder tapes and the second solder tapes are opposite;

[0008] A second busbar, and the plurality of second solder tapes are commonly electrically connected to the second busbar;

[0009] The first busbar and the second busbar are arranged at intervals with a first distance D1;

[0010] A junction box, the junction box has a first connection head and a second connection head, and the first connection head and the second connection head are arranged at intervals with a second distance D2;

[0011] A first conductive member, one end of the first conductive member is connected to the first busbar, and the other end of the first conductive member is connected to the first connection head;

[0012] A second conductive member, one end of the second conductive member is connected to the second busbar, and the other end of the second conductive member is connected to the second connection head.

[0013] Optionally, the first conductive member includes a first connection section and a first bending section. The first connection section and the first bending section are connected. The first connection section is connected to the first bus bar and is arranged in the same direction as the first bus bar. The first bending section bends away from the first bus bar, and the free end of the first bending section is connected to the first terminal.

[0014] Optionally, the first connection section bends relative to the first bending section at a first angle. The range of the first angle is greater than or equal to 30° and less than or equal to 150°.

[0015] Optionally, the first angle is 90°.

[0016] Optionally, the second conductive member includes a second connection section and a second bending section. The second connection section and the second bending section are connected. The second connection section is connected to the second bus bar and is arranged in the same direction as the second bus bar. The second bending section bends away from the second bus bar, and the free end of the second bending section is connected to the second terminal.

[0017] Optionally, the second connection section bends relative to the second bending section at a second angle. The range of the second angle is greater than or equal to 30° and less than or equal to 150°.

[0018] Optionally, the second angle is 90°.

[0019] Optionally, the first angle and the second angle are equal.

[0020] Optionally, the first distance D1 is less than the second distance D2.

[0021] Optionally, the range of the first distance D1 is greater than 0 and less than or equal to 2 mm.

[0022] Optionally, the range of the second distance D2 is greater than or equal to 5 mm and less than or equal to 10 mm.

[0023] Optionally, the first battery string and the second battery string are of the same type of battery string.

[0024] In the present application, a first conductive member is provided on the first bus bar, and a second conductive member is provided on the second bus bar. The positions of the conductive members on the bus bar can be flexibly set, so that there is enough space between the first conductive member and the second conductive member to install a junction box. Thus, there is no need to produce two types of battery strings, greatly simplifying the production process flow of the battery module. Moreover, in the solution of the present application, the first solder tape at the edge of the first battery string and the second solder tape at the edge of the second battery string can both be connected to the junction box through the bus bar and the conductive member, which can effectively collect the carriers at the edge of the battery string, thereby improving the power generation efficiency of the battery module.

[0025] A photovoltaic system includes the above-mentioned battery module. The technical effects of the present application are the same as those of the above-mentioned battery module, and will not be elaborated here. Description of the Drawings

[0026] Figure 1 is a schematic structural diagram of the solar cell module provided by the present application Figure 1 ;

[0027] Figure 2 is a schematic structural diagram of the solar cell module provided by the present application Figure 2 。

[0028] Description of the Reference Numerals:

[0029] 10. First battery string; 20. Second battery string; 30. First solder tape; 40. First bus bar; 50. Second solder tape; 60. Second bus bar; 70. Junction box; 80. First conductive member; 801. First connection section; 802. First bending section; 90. Second conductive member; 901. Second connection section; 902. Second bending section; 101. Third solder tape; 201. Fourth solder tape. Detailed Embodiments

[0030] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation of the present application. In addition, it should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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 application.

[0032] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0033] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection or a connection capable of mutual communication; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0034] In the present application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0035] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0036] The photovoltaic system in the embodiment of the present application may include the battery components in the embodiment of the present application, and the battery components in the embodiment of the present application may include several battery strings in the embodiment of the present application.

[0037] As Figure 1 and Figure 2 shown, in the embodiment of the present application, a solar cell module includes a first battery string 10, a second battery string 20, a plurality of first solder tapes 30, a first bus bar 40, a plurality of second solder tapes 50, a second bus bar 60, a junction box 70, a first conductive member 80, and a second conductive member 90.

[0038] In the embodiment of the present application, the first direction is the horizontal direction, and the first direction is also the width direction of the first battery string 10 or the second battery string 20. The second direction is the vertical direction, and the second direction is also the length direction of the first battery string 10 or the second battery string 20.

[0039] The first battery string 10 and the second battery string 20 are arranged at intervals along the first direction. Among them, the first battery string 10 is composed of a plurality of first solar cells connected in series through solder tapes, and the second battery string 20 is composed of a plurality of second solar cells connected in series through solder tapes. A junction box 70 is installed between the first battery string 10 and the second battery string 20, and the junction box 70 is used to lead out the current on the first battery string 10 and the second battery string 20.

[0040] The plurality of first solder tapes 30 extend along the second direction and are arranged at intervals along the first direction on the first battery string 10. The polarities of the plurality of first solder tapes 30 are the same. Understandably, a plurality of third solder tapes 101 are also provided on the first battery string 10. The plurality of first solder tapes 30 and the plurality of third solder tapes 101 are arranged alternately at intervals in the first direction on the first battery string 10. The polarities of the first solder tapes 30 and the third solder tapes 101 are opposite. The first solder tapes 30 and the third solder tapes 101 with opposite polarities are alternately arranged on the first battery string 10, which can form a more efficient current transmission path, so that the current generated in the solar cells can be collected and led out more quickly, improving the overall power generation efficiency of the photovoltaic module.

[0041] A plurality of second solder tapes 50 are arranged at intervals in the first direction on the second battery string 20. The polarities of the plurality of second solder tapes 50 are the same, and the polarities of the first solder tape 30 and the second solder tape 50 are opposite. Understandably, a plurality of fourth solder tapes 201 are also arranged on the second battery string 20. The plurality of second solder tapes 50 and the plurality of fourth solder tapes 201 are arranged at intervals and alternately in the first direction on the second battery string 20. The polarities of the second solder tape 50 and the fourth solder tape 201 are opposite. The second solder tape 50 and the fourth solder tape 201 with opposite polarities are alternately arranged on the second battery string 20, which can form a more efficient current transmission path, enabling the current generated in the battery cells to be collected and exported more quickly, and improving the overall power generation efficiency of the photovoltaic module.

[0042] In the related art, in order to connect the bus bar into the junction box 70, some of the solder tapes at the edge of the battery string are separated from the bus bar, so that there is enough space to install the junction box 70 after the bus bar is bent. However, the carriers at the edge of the battery cell are lost, thereby reducing the power generation efficiency of the solar cell.

[0043] As Figure 1 shown, in the embodiment of the present application, a plurality of first solder tapes 30 are commonly electrically connected to the first bus bar 40, and a plurality of second solder tapes 50 are commonly electrically connected to the second bus bar 60. That is to say, the first bus bar 40 is electrically connected to all the first solder tapes 30 on the first battery string 10, and the second bus bar 60 is electrically connected to all the second solder tapes 50 on the second battery string 20. Therefore, in the embodiment of the present application, one end of the first conductive member 80 is connected to the first bus bar 40, and the other end of the first conductive member 80 is connected to the first terminal; one end of the second conductive member 90 is connected to the second bus bar 60, and the other end of the second conductive member 90 is connected to the second terminal. The positions of the conductive members on the bus bar can be flexibly set, so that there is enough space between the first conductive member 80 and the second conductive member 90 to install the junction box 70. Thus, there is no need to produce two types of battery strings, greatly simplifying the production process of the battery module. Moreover, in the solution of the present application, the first solder tapes 30 at the edge of the first battery string 10 and the second solder tapes 50 at the edge of the second battery string 20 can both be connected into the junction box 70 through the bus bar and the conductive member, effectively collecting the carriers at the edge of the battery string, and thus improving the power generation efficiency of the battery module.

[0044] As Figure 2As shown, in some embodiments, the first bus bar 40 and the second bus bar 60 are arranged at an interval of a first distance D1. Specifically, the range of the first distance D1 is greater than 0 and less than or equal to 2 mm. Preferably, the range of the first distance D1 is greater than or equal to 0.5 mm and less than or equal to 2 mm. In such an embodiment, the range of the first distance D1 can be 0.5 mm, 1 mm, 1.5 mm, 2 mm or any value between 0.5 mm and 2 mm, and specific values are not limited herein. The compact layout between the bus bars helps to improve the compactness between the battery strings, and various battery types can be applied. Exemplarily, such as tandem junction cells.

[0045] The junction box 70 has a first terminal and a second terminal, and the first terminal and the second terminal are arranged at an interval of a second distance D2. Specifically, the range of the second distance D2 is greater than or equal to 5 mm and less than or equal to 10 mm. In such an embodiment, the range of the second distance D2 can be 5 mm, 6 mm, 7.2 mm, 7.4 mm, 7.6 mm, 7.8 mm, 8 mm, 8.2 mm, 8.4 mm, 8.6 mm, 8.8 mm, 10 mm or any value between 5 mm and 10 mm, and specific values are not limited herein. The larger interval distance between the terminals in the junction box 70 helps to reduce the mutual interference during wiring and improve the accuracy and reliability of wiring. Preferably, the first distance D1 is less than the second distance D2.

[0046] Furthermore, the first conductive member 80 includes a first connection segment 801 and a first bending segment 802. The first connection segment 801 and the first bending segment 802 are connected. The first connection segment 801 is connected to the first bus bar 40 and is arranged in the same direction as the first bus bar 40. The first bending segment 802 is bent away from the first bus bar 40, and the free end of the first bending segment 802 is connected to the first terminal.

[0047] That is to say, the first connecting section 801 is arranged in parallel with the first bus bar 40. Specifically, the first connecting section 801 is welded to the first bus bar 40 in parallel. The first connecting section 801 and the first bus bar 40 have a large contact area, which can reduce the transmission resistance between the first bus bar 40 and the first connecting section 801 on the one hand, and improve the connection strength between the first bus bar 40 and the first connecting section 801 on the other hand. The first bending section 802 bends away from the first bus bar 40. The bending design of the first conductive member 80 allows the first conductive member 80 (including the first connecting section 801 and the first bending section 802) to be flexibly arranged in a limited space. Especially when the first conductive member 80 needs to be connected into the junction box 70, the first bending section 802 can occupy a smaller vertical space, thus improving the utilization rate of the overall space. In addition, the design of the first bending section 802 enables the first conductive member 80 to be more easily inserted into the junction box 70 without complex installation steps or additional connecting parts. This not only reduces the installation difficulty, but also reduces the risk of errors and damages that may occur during the installation process. When the first conductive member 80 needs to be maintained and replaced, the design of the bending section makes the operation more convenient. Since the conductive member can be more easily taken out of and reinstalled in the junction box 70, the maintenance time can be shortened and the replacement cost can be reduced.

[0048] Preferably, the first connecting section 801 and the first bending section 802 are integrally formed. When bearing current and mechanical stress, the integrally formed first conductive member 80 can better maintain its shape and stability, reduce the risk of failures caused by interface loosening or breakage, reduce the energy loss and temperature rise caused by contact resistance, contribute to improving the conductivity of the first conductive member, and ensure the stability and efficiency of current during transmission.

[0049] In some embodiments, the first connecting section 801 bends relative to the first bending section 802 at a first angle. The range of the first angle is greater than or equal to 30° and less than or equal to 150°. Within this angle range, the transition between the first connecting section 801 and the first bending section 802 is smoother, reducing the stress concentration points, thereby improving the strength and stability of the overall structure, and helping to ensure that the first conductive member 80 is not easily broken or deformed when bearing current transmission and external environmental influences. Preferably, the first angle is 90°.

[0050] Furthermore, the second conductive member 90 includes a second connecting section 901 and a second bending section 902. The second connecting section 901 and the second bending section 902 are connected. The second connecting section 901 is connected to the second bus bar 60 and is arranged in the same direction as the second bus bar 60. The second bending section 902 bends away from the second bus bar 60, and the free end of the second bending section 902 is connected to the second terminal.

[0051] That is to say, the second connecting section 901 is arranged in parallel with the second bus bar 60. Specifically, the second connecting section 901 is welded to the second bus bar 60 in parallel. The second connecting section 901 and the second bus bar 60 have a large contact area. On the one hand, it can reduce the transmission resistance between the second bus bar 60 and the second connecting section 901. On the other hand, it can improve the connection strength between the second bus bar 60 and the second connecting section 901. The second bending section 902 bends away from the second bus bar 60. The bending design of the second conductive member 90 allows the second conductive member 90 (including the second connecting section 901 and the second bending section 902) to be flexibly arranged in a limited space. Especially when the second conductive member 90 needs to be connected into the junction box 70, the second bending section 902 can occupy a smaller vertical space, thereby improving the utilization rate of the overall space. In addition, the design of the second bending section 902 enables the second conductive member 90 to be more easily inserted into the junction box 70 without complex installation steps or additional connecting parts. This not only reduces the installation difficulty but also reduces the risk of errors and damages that may occur during the installation process. When the second conductive member 90 needs to be maintained and replaced, the bending section design makes the operation more convenient. Since the conductive member can be more easily taken out and reinstalled from the junction box 70, the maintenance time can be shortened and the replacement cost can be reduced.

[0052] Furthermore, the second connecting section 901 bends relative to the second bending section 902 at a second included angle. The range of the second included angle is greater than or equal to 30° and less than or equal to 150°. Within this included angle range, the transition between the second connecting section 901 and the second bending section 902 is smoother, reducing the stress concentration points, thereby improving the strength and stability of the overall structure, and helping to ensure that the second conductive member 90 is not easily broken or deformed when bearing current transmission and external environmental influences. Preferably, the second included angle is 90°.

[0053] In some embodiments, the first included angle is equal to the second included angle, so that the first conductive member 80 and the second conductive member 90 can be symmetrically arranged, which is convenient for the first conductive member 80 and the second conductive member 90 to be simultaneously connected into the junction box 70.

[0054] In the embodiments of the present application, the first battery string 10 and the second battery string 20 are of the same type of battery string. The same type of battery string mentioned in the present application means that the electrode arrangement methods of the battery strings are the same. Further, the second battery string 20 can be obtained by rotating the first battery string 10 by 180 degrees. This can solve the problem in the prior art that two types of battery strings need to be manufactured, simplify the production process, and reduce product backlog. It can be understood that the same type of battery string is relative to the A string and the B string in the prior art. That is to say, in some embodiments, the first battery string 10 and the second battery string 20 are the same type of battery string, rather than the A string and the B string in the prior art.

[0055] In the description of this specification, the descriptions referring to terms such as "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0056] The foregoing is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A solar cell module, characterized in that, including a first battery string and a second battery string, the first battery string and the second battery string are arranged at intervals along a first direction; a plurality of first welding tapes, the plurality of first welding tapes extend along a second direction, and are arranged at intervals along the first direction on the first battery string, and the polarities of the plurality of first welding tapes are the same; a first bus bar, the plurality of first welding tapes are commonly electrically connected to the first bus bar; a plurality of second welding tapes, the plurality of second welding tapes are arranged at intervals along the first direction on the second battery string, the polarities of the plurality of second welding tapes are the same, and the polarities of the first welding tapes and the second welding tapes are opposite; a second bus bar, the plurality of second welding tapes are commonly electrically connected to the second bus bar; the first bus bar and the second bus bar are arranged at intervals with a first distance D1; a junction box, the junction box has a first terminal and a second terminal, the first terminal and the second terminal are arranged at intervals with a second distance D2; a first conductive member, one end of the first conductive member is connected to the first bus bar, and the other end of the first conductive member is connected to the first terminal; a second conductive member, one end of the second conductive member is connected to the second bus bar, and the other end of the second conductive member is connected to the second terminal.

2. The solar cell module according to claim 1, characterized in that, The first conductive member includes a first connection section and a first bending section, the first connection section and the first bending section are connected, the first connection section is connected to the first bus bar and is arranged in the same direction as the first bus bar, the first bending section bends away from the first bus bar, and the free end of the first bending section is connected to the first terminal.

3. The solar cell module according to claim 2, wherein The first connection section bends relative to the first bending section at a first angle, and the range of the first angle is greater than or equal to 30° and less than or equal to 150°.

4. The solar cell module according to claim 3, wherein, The first angle is 90°.

5. The solar cell module according to claim 3, wherein, The second conductive member includes a second connection section and a second bending section, the second connection section and the second bending section are connected, the second connection section is connected to the second bus bar and is arranged in the same direction as the second bus bar, the second bending section bends away from the second bus bar, and the free end of the second bending section is connected to the second terminal.

6. The solar cell module according to claim 5, characterized in that, The second connection section bends relative to the second bending section at a second angle, and the range of the second angle is greater than or equal to 30° and less than or equal to 150°.

7. The solar cell module according to claim 6, characterized in that, The second angle is 90°.

8. The solar cell module according to claim 6, wherein The first angle and the second angle are equal.

9. The solar cell module according to claim 1, wherein, The first distance D1 is less than the second distance D2.

10. The solar cell module according to claim 1, characterized in that, The range of the first distance D1 is greater than 0 and less than or equal to 2 mm.

11. The solar cell module according to claim 1, wherein The range of the second distance D2 is greater than or equal to 5 mm and less than or equal to 10 mm.

12. The solar cell module according to claim 1, wherein The first battery string and the second battery string are battery strings of the same type.

13. A photovoltaic system, characterized in that, including the battery assembly according to any one of claims 1-12.

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