Solar cell, cell assembly and photovoltaic system

Abstract

The utility model provides a solar cell, a cell assembly and a photovoltaic system. The solar cell includes: a cell substrate; a plurality of fine grids arranged on the cell substrate, wherein each fine grid is provided with a first connection point and a second connection point which are arranged at intervals along a second direction; the plurality of fine grids comprise at least one sub-fine grid group, and the sub-fine grid group comprises two sub-fine grids with opposite polarities; wherein each sub fine grid is provided with a third connection point located between the first connection point and the second connection point, and the first connection point and the second connection point are both spaced from the third connection point. Therefore, the third connection point has a certain distance with the first connection point and the second connection point, so that the current detector and the voltage detector can have a certain interval when a user performs testing, and the area of the connection point does not need to be increased in order to reserve the interval space between the current detector and the voltage detector; and the manufacturing cost of the solar cell can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a solar cell, a battery module and a photovoltaic system. Background Technology

[0002] In solar cell modules, current and voltage detectors are typically placed in contact with the same connection point of the solar cell for performance testing such as hot spots and electroluminescence (EL). In related technologies, to avoid contact between the current and voltage detectors, the area of ​​the connection point needs to be increased to allow for additional space between them. This increases the total area of ​​the connection points in the solar cell, thus increasing the manufacturing cost of the solar cell and the module.

[0003] Therefore, how to reduce the manufacturing cost of solar cells and battery modules has become an urgent problem to be solved. Utility Model Content

[0004] This invention provides a solar cell, a battery module, and a photovoltaic system to solve the technical problem of how to reduce the manufacturing cost of solar cells and battery modules.

[0005] This utility model provides a solar cell, a battery module, and a photovoltaic system. A solar cell includes: a battery substrate; a plurality of fine grids disposed on the battery substrate, the plurality of fine grids being arranged along a first direction and extending along a second direction, the first direction intersecting the second direction; a first busbar and a second busbar disposed on the battery substrate and extending along the first direction, the first busbar being conductively connected to a fine grid of a first polarity, and the second busbar being conductively connected to a fine grid of a second polarity, the first polarity and the second polarity being opposite; each fine grid having a first connection point and a second connection point arranged at intervals along the second direction, both the first connection point and the second connection point being used for conductive connection with a connector; the plurality of fine grids including at least one sub-grid group, the sub-grid group including two sub-grids of opposite polarities; wherein each sub-grid has a third connection point located between the first connection point and the second connection point, the first connection point and the second connection point being spaced apart from the third connection point.

[0006] Furthermore, the solar cell also includes an insulating member disposed on the cell substrate, the insulating member covering the third connection point, and the first connection point and the second connection point exposed from the insulating member.

[0007] Furthermore, the area of ​​the first connection point is greater than the area of ​​the third connection point; and / or, the area of ​​the second connection point is greater than the area of ​​the third connection point.

[0008] Furthermore, the battery substrate includes a first edge and a second edge arranged along the first direction; in each of the sub-grid groups, the distance from the sub-grid of the first polarity to the first edge is less than the distance from the sub-grid of the first polarity to the second edge, and the distance from the sub-grid of the second polarity to the second edge is less than the distance from the sub-grid of the second polarity to the first edge.

[0009] Furthermore, the distance from the third connection point to the first edge is 1mm to 10mm; or, the distance from the third connection point to the second edge is 1mm to 10mm.

[0010] Furthermore, the battery substrate includes a third edge and a fourth edge arranged along the second direction, and the distance from the third connection point to the third edge is 1 mm to 10 mm; or, the distance from the third connection point to the fourth edge is 1 mm to 10 mm.

[0011] Furthermore, on each of the sub-grids, the distance from the third connection point to the adjacent first connection point is equal to the distance from the third connection point to the adjacent second connection point.

[0012] Furthermore, on each of the sub-grids, the distance from the third connection point to the adjacent first connection point is greater than the distance from the third connection point to the adjacent second connection point.

[0013] Furthermore, on the sub-grid with the same polarity as the first busbar, the distance from the third connection point to the first busbar is less than the distance from the third connection point to the second busbar; on the sub-grid with the same polarity as the second busbar, the distance from the third connection point to the second busbar is less than the distance from the third connection point to the second busbar.

[0014] Furthermore, on the sub-grid with the same polarity as the first busbar, the distance from the third connection point to the first busbar is greater than the distance from the third connection point to the second busbar; on the sub-grid with the same polarity as the second busbar, the distance from the third connection point to the second busbar is greater than the distance from the third connection point to the second busbar.

[0015] Furthermore, the dimension of the third connection point in the first direction is greater than the dimension of the fine gate in the first direction.

[0016] Furthermore, the area of ​​the first connection point is 0.5 mm². 2 Up to 1mm 2 ; and / or, the area of ​​the second connection point is 0.5 mm².2 Up to 1mm 2 .

[0017] Furthermore, the area of ​​the third connection point is 1 mm². 2 Up to 4mm 2 .

[0018] This invention also improves another type of solar cell, the solar cell comprising: a cell substrate; a plurality of fine grids disposed on the cell substrate, the plurality of fine grids being arranged along a first direction and extending along a second direction, the first direction intersecting the second direction; a plurality of main grids disposed on the cell substrate, the plurality of main grids being arranged along the second direction and extending along the first direction, the main grids being electrically connected to the fine grids of the same polarity, and the main grids being insulated from the fine grids of opposite polarity; each of the main grids having a first connection point and a second connection point arranged at intervals along the first direction, the first connection point and the second connection point being used for conductive connection with a connector; the plurality of main grids including at least one sub-main grid group, the sub-main grid group including two sub-main grids of opposite polarities; wherein, each of the sub-main grids having a third connection point located between the first connection point and the second connection point, the first connection point and the second connection point being spaced apart from the third connection point.

[0019] Furthermore, the dimension of the third connection point in the second direction is greater than the dimension of the main gate in the second direction.

[0020] Furthermore, the solar cell also includes an insulating member disposed on the cell substrate, the insulating member covering the third connection point, and the first connection point and the second connection point exposed from the insulating member.

[0021] Furthermore, the area of ​​the first connection point is greater than the area of ​​the third connection point; and / or, the area of ​​the second connection point is greater than the area of ​​the third connection point.

[0022] Furthermore, the battery substrate includes a first edge and a second edge arranged along the second direction; in each of the sub-gate groups, the distance from the first polarity sub-gate to the first edge is less than the distance from the first polarity sub-gate to the second edge, and the distance from the second polarity sub-gate to the second edge is less than the distance from the second polarity sub-gate to the first edge.

[0023] Furthermore, the distance from the third connection point to the first edge is 1mm to 10mm; or, the distance from the third connection point to the second edge is 1mm to 10mm.

[0024] Furthermore, the battery substrate includes a third edge and a fourth edge arranged along the first direction, and the distance from the third connection point to the third edge is 1 mm to 10 mm; or, the distance from the third connection point to the fourth edge is 1 mm to 10 mm.

[0025] Furthermore, on each of the sub-main gates, the distance from the third connection point to the adjacent first connection point is equal to the distance from the third connection point to the adjacent second connection point.

[0026] Furthermore, on each of the sub-main gates, the distance from the third connection point to the adjacent first connection point is greater than the distance from the third connection point to the adjacent second connection point.

[0027] Furthermore, the area of ​​the first connection point is 0.5 mm². 2 Up to 1mm 2 ; and / or, the area of ​​the second connection point is 0.5 mm². 2 Up to 1mm 2 .

[0028] Furthermore, the area of ​​the third connection point is 1 mm². 2 Up to 4mm 2 .

[0029] This utility model embodiment also provides a battery assembly, which includes the solar cell described above.

[0030] Furthermore, it also includes a connector and an insulator, the connector being connected to the first connection point and the second connection point, the insulator covering the third connection point, and the first connection point and the second connection point being exposed from the insulator.

[0031] This utility model embodiment also provides a photovoltaic system, which includes the battery module as described above.

[0032] Thus, in this invention, the solar cell has a third connection point located between the first and second connection points of the grid lines, and both the first and second connection points are spaced apart from the third connection point. Therefore, when testing the solar cell, the user can connect one of the current and voltage detectors to either the first or second connection point, and the other to the third connection point. Furthermore, the distance between the third connection point and both the first and second connection points allows the current and voltage detectors to maintain a certain interval during testing, eliminating the need to connect them to the same connection point and thus avoiding the need to increase the area of ​​that connection point to accommodate the space between them. This reduces the total area of ​​the multiple connection points in the solar cell, thereby reducing the manufacturing cost. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the photovoltaic system provided by this utility model;

[0035] Figure 2 This is a schematic diagram of the battery assembly provided by this utility model;

[0036] Figure 3 This is a schematic diagram of the structure of a solar cell provided in one embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of the structure of a solar cell provided in another embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the structure of a solar cell provided in another embodiment of the present invention;

[0039] Figure 6 yes Figure 3 A schematic diagram of a portion of the structure of the solar cell shown;

[0040] Figure 7 yes Figure 3 The diagram shows a partial structural schematic of a solar cell with an insulating component.

[0041] Figure 8This is a schematic diagram of the structure of a solar cell provided in another embodiment of the present invention;

[0042] Figure 9 yes Figure 8 A schematic diagram of a portion of the structure of the solar cell shown;

[0043] Figure 10 yes Figure 8 The diagram shows a partial structural schematic of a solar cell with an insulating component.

[0044] Key component symbols: 1000, Photovoltaic system; 1001, Battery module; 100, Solar cell; 200, Connector; 101, First edge; 102, Second edge; 103, Third edge; 104, Fourth edge; 10, Battery substrate; 20, Fine grid; 21, Sub-fine grid; 30, Main grid; 31, First busbar; 32, Second busbar; 41, First connection point; 42, Second connection point; 43, Third connection point; 301, Sub-main grid; 50, Solder joint; 60, Insulator. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, and should not be construed as limiting the present utility model. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0046] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "top", "bottom", "lateral", "longitudinal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0050] Please see Figure 1 and Figure 2 The photovoltaic system 1000 in this embodiment of the present invention may include a battery module 1001. The battery module 1001 may include a plurality of solar cells 100. The plurality of solar cells 100 may be connected in series with connectors 200 to form a battery string. The battery strings in the battery module 1001 may be connected in series, in parallel, or in a series-parallel combination to achieve current collection and output. For example, the connection between the battery strings may be achieved by a busbar.

[0051] In this embodiment, the photovoltaic system 1000 can be applied in photovoltaic power plants, such as ground-mounted power plants, rooftop power plants, and floating power plants. It can also be applied to equipment or devices that utilize solar energy for power generation, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it is understood that the application scenarios of the photovoltaic system 1000 are not limited to these; that is, the photovoltaic system 1000 can be applied in all fields that require solar energy for power generation. Taking a photovoltaic power generation system network as an example, the photovoltaic system 1000 may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array may be an array combination of multiple battery modules 1001. For example, multiple battery modules 1001 can form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can collect the current generated by the photovoltaic array. The collected current flows through the inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to achieve solar power supply.

[0052] The accompanying drawings provided in this utility model are schematic diagrams, and some elements are not shown in the drawings. The purpose is to clearly describe the technical solution and highlight the key points of the utility model. It is not intended to limit the technical solution to exclude these unshown elements. That is to say, the drawings are merely examples and do not represent a limitation on the specific form of the back contact battery.

[0053] like Figures 3 to 7 As shown, this utility model embodiment provides a solar cell 100, including: a cell substrate 10; a plurality of fine grids 20 disposed on the cell substrate 10, the plurality of fine grids 20 being arranged along a first direction and extending along a second direction, the first direction intersecting the second direction; a first busbar 31 and a second busbar 32 disposed on the cell substrate 10 and extending along the first direction, the first busbar 31 and the second busbar 32 being arranged along the second direction, the first busbar 31 being electrically connected to a fine grid 20 of a first polarity, the second busbar 32 being electrically connected to a fine grid 20 of a second polarity, the first polarity and the second polarity being opposite. Each fine gate 20 is provided with a first connection point 41 and a second connection point 42 arranged at intervals along a second direction. Both the first connection point 41 and the second connection point 42 are used for conductive connection with the connector 200. The plurality of fine gates 20 includes at least one group of sub-fine gates 21, each group comprising two sub-fine gates 21 with opposite polarities. Each sub-fine gate 21 is provided with a third connection point 43 located between the first connection point 41 and the second connection point 42, with the first connection point 41 and the second connection point 42 spaced apart from the third connection point 43. In this embodiment, the first direction and the second direction are perpendicular to each other.

[0054] Thus, in this invention, the solar cell 100 has a third connection point 43 located between the first connection point 41 and the second connection point 42 of the fine grid 20, and both the first and second connection points 41 and 42 are spaced apart from the third connection point 43. Therefore, when testing the solar cell 100, the user can connect one of the current detector and the voltage detector to the first connection point 41 or the second connection point 42, and the other of the current detector and the voltage detector to the third connection point 43. Furthermore, the fact that the third connection point 43 has a certain distance from both the first and second connection points 41 and 42 allows the current detector and the voltage detector to maintain a certain distance during testing, eliminating the need to connect them to the same connection point and thus avoiding the need to increase the area of ​​the connection point to accommodate the space between them. This reduces the total area of ​​the multiple connection points in the solar cell 100, thereby reducing the manufacturing cost of the solar cell 100.

[0055] Specifically, Figures 3 to 5 The solar cell 100 is a gridless back-contact cell. In one possible embodiment, the solar cell 100 in this invention can specifically be a gridless back-contact cell. The cell substrate 10 includes a front side facing away from the sun and a back-light side. The front side faces the sun and mainly receives direct sunlight, while the back-light side faces the mounting surface of the cell assembly 1001 and mainly receives sunlight reflected from the mounting surface, such as the ground or a roof. Alternatively, the back-light side is the surface of the gridless back-contact cell with grid lines. In this way, the solar cell 100 can arrange all the grid lines on the back-light side of the solar cell 100, and there are no metal grid lines blocking the front side, thereby increasing the utilization rate of the incident light from the front and improving the photoelectric conversion efficiency of the solar cell 100.

[0056] Furthermore, since the first connection point 41 and the second connection point 42 in the solar cell 100 of this embodiment are both spaced apart from the third connection point 43, the user can avoid contact between the current detector and the voltage detector when testing the solar cell 100.

[0057] Specifically, the battery substrate 10 is the main body of the solar cell 100. For example, the battery substrate 10 may include a silicon substrate, and may also include a dielectric layer, a doped layer, a passivation layer, etc., which can be set according to the actual situation.

[0058] Furthermore, on each fine grid 20, the number of first connection points 41 and second connection points 42 can be one or more.

[0059] Understandably, in related technologies, users typically employ a "four-point probe" method, contacting the current and voltage detectors with the same connection point in the solar cell for performance tests such as hot spots and electroluminescence (EL). To avoid the current and voltage detectors coming into contact during testing, which could interfere with the test results or even damage the solar cell 100 itself, related technologies often increase the area of ​​the connection point to allow extra space for the current and voltage detectors. However, this increases the total area of ​​the connection points in the solar cell 100, thereby increasing the manufacturing cost of the solar cell 100 and the module 1001. Moreover, since the connection points are usually made of paste, increasing the total area of ​​the connection points in the solar cell 100 also increases the cost of using paste, further increasing the manufacturing cost of the solar cell 100 and the module 1001.

[0060] In this embodiment of the invention, each sub-grid 21 is provided with a third connection point 43 located between the first connection point 41 and the second connection point 42, and the first connection point 41 and the second connection point 42 are spaced apart from the third connection point 43. Therefore, when testing the solar cell 100, the user can place the current detector and the voltage detector at different connection points for testing, without having to connect the current detector and the voltage detector to the same connection point during testing. The user does not need to increase the area of ​​the connection point to make room for the gap between the current detector and the voltage detector. This can reduce the total area of ​​the connection points in the solar cell 100, reduce the cost of paste usage, and thus further reduce the manufacturing cost of the solar cell 100 and the battery module 1001.

[0061] Specifically, the first connection point 41, the second connection point 42, and the third connection point 43 can contact the detection device for testing. The detection device can include at least one of a current detector and a voltage detector.

[0062] Meanwhile, on the same sub-grid 21, the distance between the third connection point 43 and the adjacent first connection point 41 can be from 0.2mm to 3mm. For example, 0.2mm, 0.5mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.5mm, 2.8mm, and 3mm. It is understandable that setting the distance between the third connection point 43 and the first connection point 41 to be greater than or equal to 0.2mm provides sufficient spacing for the current detector and voltage detector during testing of the solar cell 100, preventing them from contacting each other during testing. Furthermore, setting the distance between the third connection point 43 and the first connection point 41 to be less than or equal to 3mm avoids a large resistance between them, thus preventing any impact on the accuracy of the test results.

[0063] Similarly, on the same sub-grid 21, the distance between the third connection point 43 and the adjacent second connection point 42 can be from 0.2mm to 3mm. For example, 0.2mm, 0.5mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.5mm, 2.8mm, and 3mm. It is understood that setting the distance between the third connection point 43 and the second connection point 42 to be greater than or equal to 0.2mm provides sufficient spacing for the current detector and voltage detector during testing of the solar cell 100, preventing them from contacting each other during testing. Furthermore, a distance of less than or equal to 3mm between the third connection point 43 and the second connection point 42 avoids a large resistance between them, which could affect the accuracy of the test results.

[0064] Specifically, the number of sub-grids 21 can be one or more, and can be set according to the actual situation, without limitation here.

[0065] Optionally, the current detector may be in contact with the first connection point 41, and the voltage detector may be in contact with the third connection point 43. Alternatively, the current detector may be in contact with the second connection point 42, and the voltage detector may be in contact with the third connection point 43. Alternatively, the voltage detector may be in contact with the first connection point 41, and the current detector may be in contact with the third connection point 43. Alternatively, the voltage detector may be in contact with the second connection point 42, and the current detector may be in contact with the third connection point 43. No limitation is made here.

[0066] Specifically, the current detector can be a probe, a PCB board, etc., without limitation. Similarly, the voltage detector can be a probe, a PCB board, etc., without limitation.

[0067] Specifically, both the first connection point 41 and the second connection point 42 can be used for conductive connection with the connector 200. This allows the second connection point 42 to function as both a testing point and a connector 200, reducing the number of additional connection points in the solar cell 100, thereby reducing the manufacturing cost of the solar cell 100 and improving the overall compactness of the solar cell 100 layout. Furthermore, the connector 200 can specifically be a solder strip or a conductive backplate.

[0068] like Figures 3 to 7 As shown, in one possible implementation, the area of ​​the first connection point 41 is greater than the area of ​​the third connection point 43; and / or, the area of ​​the second connection point 42 is greater than the area of ​​the third connection point 43.

[0069] Understandably, in the battery assembly 1001, the first connection point 41 can serve as both a test point and a connection point to the connector 200. By setting the area of ​​the first connection point 41 to be larger than the area of ​​the third connection point 43, the reliability of the connection between the first connection point 41 and the connector 200 can be enhanced, reducing the effect of poor soldering on the connector 200.

[0070] Similarly, the second connection point 42 can serve as both a test point and a connection point for the connector 200. By making the area of ​​the second connection point 42 larger than that of the third connection point 43, the reliability of the connection between the second connection point 42 and the connector 200 can be enhanced, and the effect of poor soldering on the connector 200 can be reduced.

[0071] Furthermore, in the battery assembly 1001, a third connection point 43 can also be provided to be electrically connected to the connector 200 to increase the reliability of the connection of the connector 200.

[0072] Furthermore, in the battery assembly 1001, the third connection point 43 can serve only as a testing point, and is not electrically connected to the connector 200 when it is installed. It is understood that if there are too many connection points between the connector 200 and the solar cell 100, it may increase the thermal and mechanical stress generated during the connection process between the connector 200 and the solar cell, thereby increasing the risk of microcracks and fragmentation of the solar cell 100, and thus reducing the stability and reliability of the solar cell 100. Therefore, in this embodiment of the invention, the third connection point 43 can be set not to be electrically connected to the connector 200. In other words, the third connection point 43 is isolated from the connector 200, thereby increasing the stability and reliability of the solar cell 100.

[0073] like Figure 6 and Figure 7 As shown, in one possible embodiment, the solar cell 100 further includes an insulating member 60 disposed on the cell substrate 10. The first insulating member 60 covers the third connection point 43, and the first connection point 41 and the second connection point 42 are exposed from the insulating member 60. Thus, by exposing the first connection point 41 and the second connection point 42 from the insulating member 60, it is easier for the first connection point 41 and the second connection point 42 to be electrically connected to the connector 200, thereby increasing the reliability of the connection of the connector 200 in the cell assembly 1001.

[0074] Furthermore, the insulating member 60 can be configured to completely cover the third connection point 43 so that the third connection point 43 is completely isolated from the connector 200, thereby preventing the third connection point 43 from being electrically connected to the connector 200.

[0075] Furthermore, "the first connection point 41 and the second connection point 42 are exposed from the insulating member 60" means that the insulating member 60 does not completely cover the first connection point 41 and the second connection point 42, so that the first connection point 41 and the second connection point 42 can achieve a good conductive connection with the connector 200. For example, all of the first connection point 41 and / or all of the second connection point 42 may be exposed from the insulating member 60. In other words, the insulating member 60 does not cover the first connection point 41 and / or the second connection point 42 at all, and all of the first connection point 41 and / or all of the second connection point 42 are connected to the connector 200 to further increase the conductivity between the second connection point 42 and the connector 200. Alternatively, a portion of the first connection point 41 and / or a portion of the second connection point 42 may be exposed from the insulating member 60. In other words, the insulating member 60 may cover a portion of the first connection point 41 and / or a portion of the second connection point 42.

[0076] For example, the user can expose the first connection point 41 and the second connection point 42 by making openings in the insulating member 60. Furthermore, the area of ​​a single opening can be set to be larger than the area of ​​a single first connection point 41, so as to achieve a stable connection between the first connection point 41 and the second connection point 42 and the connector 200.

[0077] For example, the insulating member 60 may include a plurality of insulating strips, with a gap between adjacent insulating strips in the second direction, and the first connection point 41 or the second connection point 42 located within the gap formed by the two adjacent insulating strips. Further, the area of ​​the gap may be set larger than that of the first connection point 41 to achieve a stable connection between the first connection point 41 and the connector 200, and the area of ​​the gap may be set larger than that of the second connection point 42 to achieve a stable connection between the second connection point 42 and the connector 200.

[0078] Of course, in other embodiments of the battery assembly 1001, the first connection point 41 and the second connection point 42 may be electrically connected to the connector 200, and the third connection point 43 may be insulated from the connector 200; or, the first connection point 41, the second connection point 42 and the third connection point 43 may all be electrically connected to the connector 200.

[0079] like Figure 3As shown, in one possible implementation, on the sub-grid 21 with the same polarity as the first busbar 31, the distance from the third connection point 43 to the first busbar 31 is less than the distance from the third connection point 43 to the second busbar 32; similarly, on the sub-grid 21 with the same polarity as the second busbar 32, the distance from the third connection point 43 to the second busbar 32 is less than the distance from the third connection point 43 to the second busbar 32. This allows the third connection point 43 to be positioned close to busbars of the same polarity, thereby reducing the current transmission path between the third connection point 43 and the busbars of the same polarity, and thus improving the accuracy of the tests performed by the current detector and voltage detector on the solar cell 100.

[0080] like Figure 4 As shown, in one possible implementation, on the sub-grid 21 with the same polarity as the first busbar 31, the distance from the third connection point 43 to the first busbar 31 is greater than the distance from the third connection point 43 to the second busbar 32; similarly, on the sub-grid 21 with the same polarity as the second busbar 32, the distance from the third connection point 43 to the second busbar 32 is greater than the distance from the third connection point 43 to the second busbar 32. This allows the third connection point 43 to be relatively far from the busbars of the same polarity, thereby increasing the testing range of the current detector and voltage detector, and consequently improving the accuracy of the current detector and voltage detector when testing the solar cell 100.

[0081] like Figure 4 As shown, in one possible implementation, the dimension h1 of the third connection point 43 in the first direction is larger than the dimension h2 of the fine grid 20 in the first direction. This allows the third connection point 43 sufficient space to contact the current detector and voltage detector, thereby improving the accuracy of the tests performed by the current detector and voltage detector on the solar cell 100.

[0082] In one possible implementation, the area of ​​the first connection point 41 is 0.5 mm². 2 Up to 1mm 2 ; and / or, the area of ​​the second connection point 42 is 0.5 mm². 2 Up to 1mm 2 In this way, a stable connection can be achieved between the first connection point 41 and the connector 200, while avoiding an excessively large area of ​​the first connection point 41, thereby reducing the total area of ​​the connection points in the solar cell 100 and thus reducing the manufacturing cost of the solar cell 100 and the battery module 1001. Furthermore, a stable connection can also be achieved between the second connection point 42 and the connector 200, while avoiding an excessively large area of ​​the second connection point 42, thereby reducing the total area of ​​the connection points in the solar cell 100 and thus reducing the manufacturing cost of the solar cell 100 and the battery module 1001.

[0083] Specifically, the area of ​​the first connection point 41 can be 0.5 mm². 2 0.6mm 2 0.7mm 2 0.8mm 2 0.9mm 2 1mm 2 Specifically, the area of ​​the second connection point 42 can be 0.5 mm². 2 0.6mm 2 0.7mm 2 0.8mm 2 0.9mm 2 1mm 2 .

[0084] like Figures 3 to 7 As shown, in one possible implementation, the area of ​​the third connection point 43 is 1 mm². 2 Up to 4mm 2 For example, 1mm 2 1.5mm 2 1.8mm 2 2mm 2 2.5mm 2 2.8mm 2 3mm 2 3.5mm 2 3.8mm 2 4mm 2 In this way, stable contact can be achieved between the first connection point 41 and the current detector or voltage detector, while avoiding an excessively large area of ​​the first connection point 41, thereby reducing the total area of ​​the connection points in the solar cell 100 and reducing the manufacturing cost of the solar cell 100 and the battery module 1001.

[0085] The first connection point 41, the second connection point 42, and the third connection point 43 can be square, circular, triangular, or irregular in shape, but are not limited to these.

[0086] Preferably, in one embodiment, the third connection point 43 is circular, and the diameter of the third connection point 43 is 1 mm. This ensures good contact between the third connection point 43 and the detection device.

[0087] Preferably, in one embodiment, the first connection point 41 is square, and the width of the first connection point 41 is 1.2mm. This enables a stable connection between the first connection point 41 and the connector 200.

[0088] Preferably, in one embodiment, the second connection point 42 is square, and the width of the second connection point 42 is 1.2mm. This enables a stable connection between the second connection point 42 and the connector 200.

[0089] like Figures 3 to 7 As shown, in one possible implementation, the solar cell 100 further includes a plurality of solder points 50 disposed on the cell substrate 10. The solder points 50 are used to connect with the connector 200 to achieve an electrical connection between the connector 200 and the solar cell 100. In this embodiment of the invention, the solder points 50 may only be used for connection with the connector 200 and do not function as connection points.

[0090] like Figures 3 to 7 As shown, in one possible implementation, the battery substrate 10 includes a first edge 101 and a second edge 102 arranged along a first direction, both the first edge 101 and the second edge 102 extending along a second direction.

[0091] In each group of sub-grids 21, the distance from the first polarity sub-grid 21 to the first edge 101 is less than the distance from the first polarity sub-grid 21 to the second edge 102, and the distance from the second polarity sub-grid 21 to the second edge 102 is less than the distance from the second polarity sub-grid 21 to the first edge 101. In this way, the first connection point 41, the second connection point 42, and the third connection point 43 can be positioned close to the edge of the solar cell 100 while avoiding problems such as microcracks in the printing caused by the first connection point 41 being too close to the edge of the solar cell 100.

[0092] Understandably, test results are more accurate when the test device is in contact with the edge of the solar cell 100.

[0093] Specifically, the distance from the third connection point 43 to the first edge 101 is 1mm to 10mm; or, the distance from the third connection point 43 to the second edge 102 is 1mm to 10mm.

[0094] The distance from the third connection point 43 to the first edge 101 is 1mm to 10mm. For example, 1mm, 1.2mm, 1.5mm, 2mm, 2.2mm, 2.5mm, 3mm, 5mm, 5.5mm, 8mm, 10mm.

[0095] Alternatively, the distance from the third connection point 43 to the second edge 102 is 1mm to 10mm. For example, 1mm, 1.2mm, 1.5mm, 2mm, 2.2mm, 2.5mm, 3mm, 5mm, 5.5mm, 8mm, 10mm.

[0096] Specifically, the first edge 101 and the second edge 102 are two opposing boundary lines of the solar cell 100 in the second direction, and both the first edge 101 and the second edge 102 extend along the first direction. The third connection point 43 may be located near the first edge 101; or, the third connection point 43 may also be located near the second edge 102.

[0097] Specifically, the distance between the third connection point 43 and the first edge 101 refers to the distance between the point in the third connection point 43 closest to the first edge 101 and the first edge 101 in the second direction. The distance between the third connection point 43 and the second edge 102 refers to the distance between the point in the third connection point 43 closest to the second edge 102 and the second edge 102 in the second direction.

[0098] Understandably, the third connection point 43 can be positioned close to the edge of the solar cell 100 to facilitate contact between the detection device and the third connection point 43. However, if the third connection point 43 is too close to the edge of the solar cell 100, it can cause problems such as microcracks in the printing. Therefore, setting a certain distance between the third connection point 43 and the first edge 101 or the second edge 102 can avoid problems such as microcracks in the printing caused by the third connection point 43 being too close to the edge of the solar cell 100.

[0099] like Figures 3 to 7 As shown, in one possible implementation, the battery substrate 10 includes a third edge 103 and a fourth edge 104 arranged along a second direction, both extending along a first direction. The distance from the third connection point 43 to the third edge 103 is 1 mm to 10 mm; or, the distance from the third connection point 43 to the fourth edge 104 is 1 mm to 10 mm.

[0100] Understandably, test results are more accurate when the test device is in contact with the edge of the solar cell 100.

[0101] The distance from the third connection point 43 to the third edge 103 is 1mm to 10mm. For example, 1mm, 1.2mm, 1.5mm, 2mm, 2.2mm, 2.5mm, 3mm, 5mm, 5.5mm, 8mm, 10mm.

[0102] Alternatively, the distance from the third connection point 43 to the fourth edge 104 is 1mm to 10mm. For example, 1mm, 1.2mm, 1.5mm, 2mm, 2.2mm, 2.5mm, 3mm, 5mm, 5.5mm, 8mm, 10mm.

[0103] Specifically, the third edge 103 and the fourth edge 104 are two opposing boundary lines of the solar cell 100 in the first direction, and both the third edge 103 and the fourth edge 104 extend along the second direction. The third connection point 43 may be located near the third edge 103; or, the third connection point 43 may also be located near the fourth edge 104.

[0104] Specifically, the distance between the third connection point 43 and the third edge 103 refers to the distance between the point in the third connection point 43 closest to the fourth edge 104 and the third edge 103 in the second direction. The distance from the third connection point 43 to the fourth edge 104 refers to the distance between the point in the third connection point 43 closest to the fourth edge 104 and the second edge 102 in the second direction.

[0105] Understandably, the third connection point 43 can be positioned close to the edge of the solar cell 100 to facilitate contact between the detection device and the third connection point 43. However, if the third connection point 43 is too close to the edge of the solar cell 100, it can cause problems such as microcracks in the printing. Therefore, setting a certain distance between the third connection point 43 and the third edge 103 or the fourth edge 104 can avoid problems such as microcracks in the printing caused by the third connection point 43 being too close to the edge of the solar cell 100.

[0106] In one possible implementation, on each sub-grid 21, the distance from the third connection point 43 to the adjacent first connection point 41 is equal to the distance from the third connection point 43 to the adjacent second connection point 42. Thus, during testing, the current detector and voltage detector can be located at the third connection point 43 and the first connection point 41, or at the second connection point 42 and the first connection point 41, to facilitate testing for the user.

[0107] In one possible implementation, on each sub-grid 21, the distance from the third connection point 43 to the adjacent first connection point 41 is greater than the distance from the third connection point 43 to the adjacent second connection point 42. Thus, when the current detector and voltage detector are distributed at the third connection point 43 and the second connection point 42, the distance between the current detector and the voltage detector can be reduced, thereby improving the accuracy of the current detector and voltage detector in testing the solar cell 100.

[0108] like Figures 8 to 10As shown, this embodiment of the present invention also provides another type of solar cell 100, including: a cell substrate 10, a plurality of fine grids 20, and a plurality of main grids 30; the plurality of fine grids 20 are disposed on the cell substrate 10, the plurality of fine grids 20 are arranged along a first direction and extend along a second direction, the first direction and the second direction intersect; the plurality of main grids 30 are disposed on the cell substrate 10, the plurality of main grids 30 are arranged along the second direction and extend along the first direction, the main grids 30 are electrically connected to the fine grids 20 of the same polarity, and the main grids 30 are electrically insulated from the fine grids 20 of opposite polarity. Each main gate 30 is provided with a first connection point 41 and a second connection point 42 arranged at intervals along a first direction. The first connection point 41 and the second connection point 42 are both used for conductive connection with the connector 200. The multiple main gates 30 include at least one sub-main gate group, and the sub-main gate group includes two sub-main gates 301 with opposite polarities. Each sub-main gate 301 is provided with a third connection point 43 located between the first connection point 41 and the second connection point 42. The first connection point 41 and the second connection point 42 are spaced apart from the third connection point 43.

[0109] Thus, in this utility model, the solar cell 100 has a third connection point 43 located between the first connection point 41 and the second connection point 42 of the main grid 30, and both the first and second connection points 41 and 42 are spaced apart from the third connection point 43. Therefore, when testing the solar cell 100, the user can connect one of the current detector and the voltage detector to the first connection point 41 or the second connection point 42, and the other of the current detector and the voltage detector to the third connection point 43. Furthermore, the distance between the third connection point 43 and both the first and second connection points 41 and 42 allows the current detector and the voltage detector to maintain a certain interval during testing, eliminating the need to connect them to the same connection point and thus avoiding the need to increase the area of ​​the connection point to accommodate the space between them. This reduces the total area of ​​the multiple connection points in the solar cell 100, thereby reducing the manufacturing cost of the solar cell 100.

[0110] Specifically, Figures 8 to 10 The solar cell 100 is a back-contact cell with a main grid, and has both a main grid 30 and a fine grid 20. For example... Figures 8 to 10As shown, in one possible implementation, the solar cell 100 of this invention can specifically be a back-contact cell with a main grid. The cell substrate 10 includes a front side facing away from the sun and a back-lighting side. The front side faces the sun and mainly receives direct sunlight, while the back-lighting side faces the mounting surface of the cell assembly 1001 and mainly receives sunlight reflected from the mounting surface, such as the ground or a roof. Alternatively, the back-lighting side is the surface of the back-contact cell with a main grid that has grid lines. In this way, the solar cell 100 can arrange all the grid lines on the back-lighting side of the solar cell 100, and there are no metal grid lines blocking the front side, thereby increasing the utilization rate of the incident light from the front and improving the photoelectric conversion efficiency of the solar cell 100.

[0111] Furthermore, since the first connection point 41 and the second connection point 42 in the solar cell 100 of this embodiment are both spaced apart from the third connection point 43, the user can avoid contact between the current detector and the voltage detector when testing the solar cell 100.

[0112] Furthermore, since the first connection point 41 and the second connection point 42 in the solar cell 100 of this embodiment are both spaced apart from the third connection point 43, the user can avoid contact between the current detector and the voltage detector when testing the solar cell 100.

[0113] Furthermore, on each main gate 30, the number of first connection points 41 and second connection points 42 can be one or more.

[0114] Understandably, in related technologies, users typically employ a "four-point probe" method, contacting the current and voltage detectors with the same connection point in the solar cell for performance tests such as hot spots and electroluminescence (EL). To avoid the current and voltage detectors coming into contact during testing, which could interfere with the test results or even damage the solar cell 100 itself, related technologies often increase the area of ​​the connection point to allow extra space for the current and voltage detectors. However, this increases the total area of ​​the connection points in the solar cell 100, thereby increasing the manufacturing cost of the solar cell 100 and the module 1001. Moreover, since the connection points are usually made of paste, increasing the total area of ​​the connection points in the solar cell 100 also increases the cost of using paste, further increasing the manufacturing cost of the solar cell 100 and the module 1001.

[0115] In this embodiment of the invention, each sub-main grid 301 is provided with a third connection point 43 located between the first connection point 41 and the second connection point 42, and the first connection point 41 and the second connection point 42 are spaced apart from the third connection point 43. Therefore, when testing the solar cell 100, the user can place the current detector and the voltage detector at different connection points for testing, without having to connect the current detector and the voltage detector to the same connection point during testing. The user does not need to increase the area of ​​the connection point to make room for the gap between the current detector and the voltage detector. This can reduce the total area of ​​the connection points in the solar cell 100, reduce the cost of paste usage, and thus further reduce the manufacturing cost of the solar cell 100 and the battery module 1001.

[0116] Specifically, the first connection point 41, the second connection point 42, and the third connection point 43 can contact the detection device for testing. The detection device can include at least one of a current detector and a voltage detector.

[0117] Meanwhile, on the same sub-main grid 301, the distance between the third connection point 43 and the adjacent first connection point 41 can be from 0.2mm to 3mm. For example, 0.2mm, 0.5mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.5mm, 2.8mm, and 3mm. It is understandable that setting the distance between the third connection point 43 and the first connection point 41 to be greater than or equal to 0.2mm provides sufficient spacing for the current detector and voltage detector during testing of the solar cell 100, preventing them from contacting each other during testing. Furthermore, setting the distance between the third connection point 43 and the first connection point 41 to be less than or equal to 3mm avoids a large resistance between them, which could affect the accuracy of the test results.

[0118] Similarly, on the same sub-main grid 301, the distance between the third connection point 43 and the adjacent second connection point 42 can be from 0.2mm to 3mm. For example, 0.2mm, 0.5mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.5mm, 2.8mm, and 3mm. It is understood that setting the distance between the third connection point 43 and the second connection point 42 to be greater than or equal to 0.2mm provides sufficient spacing for the current detector and voltage detector during testing of the solar cell 100, preventing them from contacting each other during testing. Furthermore, a distance of less than or equal to 3mm between the third connection point 43 and the second connection point 42 avoids a large resistance between them, which could affect the accuracy of the test results.

[0119] Specifically, the number of sub-gate groups can be one or more, and the specific number can be set according to the actual situation, without limitation here.

[0120] Optionally, the current detector may be in contact with the first connection point 41, and the voltage detector may be in contact with the third connection point 43. Alternatively, the current detector may be in contact with the second connection point 42, and the voltage detector may be in contact with the third connection point 43. Alternatively, the voltage detector may be in contact with the first connection point 41, and the current detector may be in contact with the third connection point 43. Alternatively, the voltage detector may be in contact with the second connection point 42, and the current detector may be in contact with the third connection point 43. No limitation is made here.

[0121] Specifically, the current detector can be a probe, a PCB board, etc., without limitation. Similarly, the voltage detector can be a probe, a PCB board, etc., without limitation.

[0122] Specifically, both the first connection point 41 and the second connection point 42 can be used for conductive connection with the connector 200. This allows the second connection point 42 to function as both a testing point and a connector 200, reducing the number of additional connection points in the solar cell 100, thereby reducing the manufacturing cost of the solar cell 100 and improving the overall compactness of the solar cell 100 layout. Furthermore, the connector 200 can specifically be a solder strip or a conductive backplate.

[0123] like Figures 8 to 10 As shown, in one possible implementation, the area of ​​the first connection point 41 is greater than the area of ​​the third connection point 43; and / or, the area of ​​the second connection point 42 is greater than the area of ​​the third connection point 43.

[0124] Understandably, in the battery assembly 1001, the first connection point 41 can serve as both a test point and a connection point to the connector 200. By setting the area of ​​the first connection point 41 to be larger than the area of ​​the third connection point 43, the reliability of the connection between the first connection point 41 and the connector 200 can be enhanced, reducing the effect of poor soldering on the connector 200.

[0125] Similarly, the second connection point 42 can serve as both a test point and a connection point for the connector 200. By making the area of ​​the second connection point 42 larger than that of the third connection point 43, the reliability of the connection between the second connection point 42 and the connector 200 can be enhanced, and the effect of poor soldering on the connector 200 can be reduced.

[0126] Furthermore, in the battery assembly 1001, a third connection point 43 can also be provided to be electrically connected to the connector 200 to increase the reliability of the connection of the connector 200.

[0127] Furthermore, in the battery assembly 1001, the third connection point 43 can serve only as a testing point, and is not electrically connected to the connector 200 when it is installed. It is understood that if there are too many connection points between the connector 200 and the solar cell 100, it may increase the thermal and mechanical stress generated during the connection process between the connector 200 and the solar cell, thereby increasing the risk of microcracks and fragmentation of the solar cell 100, and thus reducing the stability and reliability of the solar cell 100. Therefore, in this embodiment of the invention, the third connection point 43 can be set not to be electrically connected to the connector 200. In other words, the third connection point 43 is isolated from the connector 200, thereby increasing the stability and reliability of the solar cell 100.

[0128] like Figure 9 and Figure 10 As shown, in one possible embodiment, the solar cell 100 further includes an insulating member 60 disposed on the cell substrate 10. The first insulating member 60 covers the third connection point 43, and the first connection point 41 and the second connection point 42 are exposed from the insulating member 60. Thus, by exposing the first connection point 41 and the second connection point 42 from the insulating member 60, it is easier for the first connection point 41 and the second connection point 42 to be electrically connected to the connector 200, thereby increasing the reliability of the connection of the connector 200 in the cell assembly 1001.

[0129] Furthermore, the insulating member 60 can be configured to completely cover the third connection point 43 so that the third connection point 43 is completely isolated from the connector 200, thereby preventing the third connection point 43 from being electrically connected to the connector 200.

[0130] Furthermore, "the first connection point 41 and the second connection point 42 are exposed from the insulating member 60" means that the insulating member 60 does not completely cover the first connection point 41 and the second connection point 42, so that the first connection point 41 and the second connection point 42 can achieve a good conductive connection with the connector 200. For example, all of the first connection point 41 and / or all of the second connection point 42 may be exposed from the insulating member 60. In other words, the insulating member 60 does not cover the first connection point 41 and / or the second connection point 42 at all, and all of the first connection point 41 and / or all of the second connection point 42 are connected to the connector 200 to further increase the conductivity between the second connection point 42 and the connector 200. Alternatively, a portion of the first connection point 41 and / or a portion of the second connection point 42 may be exposed from the insulating member 60. In other words, the insulating member 60 may cover a portion of the first connection point 41 and / or a portion of the second connection point 42.

[0131] For example, the user can expose the first connection point 41 and the second connection point 42 by making openings in the insulating member 60. Furthermore, the area of ​​a single opening can be set to be larger than the area of ​​a single first connection point 41, so as to achieve a stable connection between the first connection point 41 and the second connection point 42 and the connector 200.

[0132] For example, the insulating member 60 may include a plurality of insulating strips, with a gap between adjacent insulating strips in the second direction, and the first connection point 41 or the second connection point 42 located within the gap formed by the two adjacent insulating strips. Further, the area of ​​the gap may be set larger than that of the first connection point 41 to achieve a stable connection between the first connection point 41 and the connector 200, and the area of ​​the gap may be set larger than that of the second connection point 42 to achieve a stable connection between the second connection point 42 and the connector 200.

[0133] Of course, in other embodiments of the battery assembly 1001, the first connection point 41 and the second connection point 42 may be electrically connected to the connector 200, and the third connection point 43 may be insulated from the connector 200; or, the first connection point 41, the second connection point 42 and the third connection point 43 may all be electrically connected to the connector 200.

[0134] In one possible implementation, the area of ​​the first connection point 41 is 0.5 mm². 2 Up to 1mm 2 ; and / or, the area of ​​the second connection point 42 is 0.5 mm². 2 Up to 1mm 2 In this way, a stable connection can be achieved between the first connection point 41 and the connector 200, while avoiding an excessively large area of ​​the first connection point 41, thereby reducing the total area of ​​the connection points in the solar cell 100 and thus reducing the manufacturing cost of the solar cell 100 and the battery module 1001. Furthermore, a stable connection can also be achieved between the second connection point 42 and the connector 200, while avoiding an excessively large area of ​​the second connection point 42, thereby reducing the total area of ​​the connection points in the solar cell 100 and thus reducing the manufacturing cost of the solar cell 100 and the battery module 1001.

[0135] Specifically, the area of ​​the first connection point 41 can be 0.5 mm². 2 0.6mm 2 0.7mm 2 0.8mm 2 0.9mm 2 1mm 2 Specifically, the area of ​​the second connection point 42 can be 0.5 mm². 2 0.6mm 20.7mm 2 0.8mm 2 0.9mm 2 1mm 2 .

[0136] like Figures 8 to 10 As shown, in one possible implementation, the area of ​​the third connection point 43 is 1 mm². 2 Up to 4mm 2 For example, 1mm 2 1.5mm 2 1.8mm 2 2mm 2 2.5mm 2 2.8mm 2 3mm 2 3.5mm 2 3.8mm 2 4mm 2 In this way, stable contact can be achieved between the first connection point 41 and the current detector or voltage detector, while avoiding an excessively large area of ​​the first connection point 41, thereby reducing the total area of ​​the connection points in the solar cell 100 and reducing the manufacturing cost of the solar cell 100 and the battery module 1001.

[0137] The first connection point 41, the second connection point 42, and the third connection point 43 can be square, circular, triangular, or irregular in shape, but are not limited to these.

[0138] Preferably, in one embodiment, the third connection point 43 is circular, and the diameter of the third connection point 43 is 1 mm. This ensures good contact between the third connection point 43 and the detection device.

[0139] Preferably, in one embodiment, the first connection point 41 is square, and the width of the first connection point 41 is 1.2mm. This enables a stable connection between the first connection point 41 and the connector 200.

[0140] Preferably, in one embodiment, the second connection point 42 is square, and the width of the second connection point 42 is 1.2mm. This enables a stable connection between the second connection point 42 and the connector 200.

[0141] like Figure 8 As shown, in one possible implementation, the dimension h3 of the third connection point 43 in the second direction is larger than the dimension h4 of the main grid 30 in the second direction. This allows the third connection point 43 sufficient space to contact the current detector and voltage detector, thereby improving the accuracy of the tests performed by the current detector and voltage detector on the solar cell 100.

[0142] like Figures 8 to 10 As shown, in one possible implementation, the solar cell 100 further includes a plurality of solder points 50 disposed on the cell substrate 10. The solder points 50 are used to connect with the connector 200 to achieve an electrical connection between the connector 200 and the solar cell 100. In this embodiment of the invention, the solder points 50 may only be used for connection with the connector 200 and do not function as connection points.

[0143] like Figures 8 to 10 As shown, in one possible implementation, the battery substrate 10 includes a first edge 101 and a second edge 102 arranged along a second direction, both the first edge 101 and the second edge 102 extending along the first direction.

[0144] In each sub-busbar group, the distance from the first polarity sub-busbar 301 to the first edge 101 is less than the distance from the first polarity sub-busbar 301 to the second edge 102, and the distance from the second polarity sub-busbar 301 to the second edge 102 is less than the distance from the second polarity sub-busbar 301 to the first edge 101. In this way, the first connection point 41, the second connection point 42, and the third connection point 43 can be located close to the edge of the solar cell 100 while avoiding problems such as microcracks in the printing caused by the first connection point 41 being too close to the edge of the solar cell 100.

[0145] Understandably, test results are more accurate when the test device is in contact with the edge of the solar cell 100.

[0146] Specifically, the distance from the third connection point 43 to the first edge 101 is 1mm to 10mm; or, the distance from the third connection point 43 to the second edge 102 is 1mm to 10mm.

[0147] The distance from the third connection point 43 to the first edge 101 is 1mm to 10mm. For example, 1mm, 1.2mm, 1.5mm, 2mm, 2.2mm, 2.5mm, 3mm, 5mm, 5.5mm, 8mm, 10mm.

[0148] Alternatively, the distance from the third connection point 43 to the second edge 102 is 1mm to 10mm. For example, 1mm, 1.2mm, 1.5mm, 2mm, 2.2mm, 2.5mm, 3mm, 5mm, 5.5mm, 8mm, 10mm.

[0149] Specifically, the first edge 101 and the second edge 102 are two opposing boundary lines of the solar cell 100 in the first direction, and both the first edge 101 and the second edge 102 extend along the second direction. The third connection point 43 may be located near the first edge 101; or, the third connection point 43 may also be located near the second edge 102.

[0150] Specifically, the distance between the third connection point 43 and the first edge 101 refers to the distance between the point in the third connection point 43 closest to the first edge 101 and the first edge 101 in the first direction. The distance between the third connection point 43 and the second edge 102 refers to the distance between the point in the third connection point 43 closest to the second edge 102 and the second edge 102 in the first direction.

[0151] Understandably, the third connection point 43 can be positioned close to the edge of the solar cell 100 to facilitate contact between the detection device and the third connection point 43. However, if the third connection point 43 is too close to the edge of the solar cell 100, it can cause problems such as microcracks in the printing. Therefore, setting a certain distance between the third connection point 43 and the first edge 101 or the second edge 102 can avoid problems such as microcracks in the printing caused by the third connection point 43 being too close to the edge of the solar cell 100.

[0152] Understandably, the third connection point 43 can be positioned close to the edge of the solar cell 100 to facilitate contact between the detection device and the third connection point 43. However, if the third connection point 43 is too close to the edge of the solar cell 100, it can cause problems such as microcracks in the printing. Therefore, setting a certain distance between the third connection point 43 and the first edge 101 or the second edge 102 can avoid problems such as microcracks in the printing caused by the third connection point 43 being too close to the edge of the solar cell 100.

[0153] like Figures 8 to 10 As shown, in one possible embodiment, the battery substrate 10 includes a third edge 103 and a fourth edge 104 arranged along a first direction, both of which extend along a second direction. The distance from the third connection point 43 to the third edge 103 is 1 mm to 10 mm; or, the distance from the third connection point 43 to the fourth edge 104 is 1 mm to 10 mm.

[0154] Understandably, test results are more accurate when the test device is in contact with the edge of the solar cell 100.

[0155] The distance from the third connection point 43 to the third edge 103 is 1mm to 10mm. For example, 1mm, 1.2mm, 1.5mm, 2mm, 2.2mm, 2.5mm, 3mm, 5mm, 5.5mm, 8mm, 10mm.

[0156] Alternatively, the distance from the third connection point 43 to the fourth edge 104 is 1mm to 10mm. For example, 1mm, 1.2mm, 1.5mm, 2mm, 2.2mm, 2.5mm, 3mm, 5mm, 5.5mm, 8mm, 10mm.

[0157] Specifically, the third edge 103 and the fourth edge 104 are two opposing boundary lines of the solar cell 100 in the second direction, and both the third edge 103 and the fourth edge 104 extend along the first direction. The third connection point 43 may be located near the third edge 103; or, the third connection point 43 may also be located near the fourth edge 104.

[0158] Specifically, the distance from the third connection point 43 to the third edge 103 refers to the distance between the point in the third connection point 43 closest to the fourth edge 104 and the third edge 103 in the second direction. The distance from the third connection point 43 to the fourth edge 104 refers to the distance between the point in the third connection point 43 closest to the fourth edge 104 and the second edge 102 in the second direction.

[0159] Understandably, the third connection point 43 can be positioned close to the edge of the solar cell 100 to facilitate contact between the detection device and the third connection point 43. However, if the third connection point 43 is too close to the edge of the solar cell 100, it can cause problems such as microcracks in the printing. Therefore, setting a certain distance between the third connection point 43 and the third edge 103 or the fourth edge 104 can avoid problems such as microcracks in the printing caused by the third connection point 43 being too close to the edge of the solar cell 100.

[0160] In one possible implementation, on each sub-gate 301, the distance from the third connection point 43 to the adjacent first connection point 41 is equal to the distance from the third connection point 43 to the adjacent second connection point 42. Thus, during testing, the current detector and voltage detector can be located at the third connection point 43 and the first connection point 41, or at the second connection point 42 and the first connection point 41, to facilitate testing for the user.

[0161] In one possible implementation, on each sub-main grid 301, the distance from the third connection point 43 to the adjacent first connection point 41 is greater than the distance from the adjacent third connection point 43 to the second connection point 42. Thus, when the current detector and voltage detector are distributed at the third connection point 43 and the second connection point 42, the distance between the current detector and the voltage detector can be reduced, thereby improving the accuracy of the current detector and voltage detector in testing the solar cell 100.

[0162] This utility model embodiment also provides a battery assembly 1001, which includes the solar cell 100 described in any of the above claims.

[0163] In one possible implementation, the battery assembly 1001 further includes a connector 200, which is connected to the first connection point 41 and the second connection point 42. This enhances the reliability of the connection between the solar cell 100 and the connector 200, reducing the likelihood of poor soldering of the connector 200. Simultaneously, the first connection point 41 and the second connection point 42 can function as both testing points and connectors for the connector 200, reducing the number of additional connection points in the solar cell 100, thereby reducing the manufacturing cost of the solar cell 100 and improving the overall compactness of the solar cell 100 layout. Further, the connector 200 can specifically be a solder strip or a conductive backsheet.

[0164] In one possible implementation, the battery assembly 1001 further includes a connector 200 and an insulator 60. The connector 200 is connected to a first connection point 41 and a second connection point 42, and the insulator 60 covers a third connection point 43. The first connection point 41 and the second connection point 42 are exposed from the insulator 60. It is understood that if there are too many connection points between the connector 200 and the solar cell 100, it may increase the thermal and mechanical stress generated during the connection process between the connector 200 and the solar cell, thereby increasing the risk of microcracks and fragmentation of the solar cell 100, and thus reducing the stability and reliability of the solar cell 100. Therefore, in this embodiment of the invention, the insulator 60 is provided to cover the third connection point 43, and the first connection point 41 and the second connection point 42 are exposed from the insulator 60, thereby increasing the stability and reliability of the solar cell 100.

[0165] Furthermore, the connector 200 is connected to the first connection point 41 and the second connection point 42, and the connector 200 is insulated from the third connection point 43 by the insulator 60. Specifically, when one connector 200 is connected to the solar cell 100, the connector 200 can simultaneously cover the first connection point 41 and the second connection point 42. Further, the insulator 60 is provided between the connector 200 and the third connection point 43 for insulation. This reduces the number of connection points added to the solar cell 100, thereby reducing the manufacturing cost of the solar cell 100 and improving the overall compactness of the solar cell 100 layout. Moreover, it avoids having too many connection points between the connector 200 and the solar cell 100, thereby reducing the thermal and mechanical stress generated during the connection process between the connector 200 and the solar cell, thus reducing the risk of microcracks and fragmentation of the solar cell 100, and increasing the stability and reliability of the solar cell 100.

[0166] In addition, in some embodiments, the first connection point 41, the second connection point 42 and the third connection point 43 may be insulated from the connector 200, which is not limited here.

[0167] It is understood that in such an embodiment, the battery assembly 1001 may also include a frame, a backsheet, photovoltaic glass, and an encapsulating film. The encapsulating film may be filled between the front and back surfaces of the solar cells 100, the photovoltaic glass, adjacent solar cells 100, etc. As a filler, it may be a transparent colloid with good light transmittance and aging resistance. For example, the encapsulating film may be an EVA film or a POE film, and the specific choice can be made according to the actual situation, without limitation.

[0168] Photovoltaic glass can be applied to the encapsulating film on the front side of the solar cell 100. This photovoltaic glass can be ultra-clear glass, possessing high light transmittance, high transparency, and superior physical, mechanical, and optical properties. For example, ultra-clear glass can achieve a light transmittance of over 92%, protecting the solar cell 100 while minimizing impact on its efficiency. Simultaneously, the encapsulating film bonds the photovoltaic glass and the solar cell 100 together, providing sealing, insulation, and waterproofing / moisture protection for the solar cell 100.

[0169] The backsheet can be attached to the adhesive film on the back side of the solar cell 100. The backsheet provides protection and support for the solar cell 100, and possesses reliable insulation, water resistance, and aging resistance. Multiple options are available for the backsheet, typically including tempered glass, acrylic glass, aluminum alloy TPT composite adhesive film, etc., and the specific choice is determined based on the specific circumstances and is not limited here. The backsheet, solar cell 100, adhesive film, and photovoltaic glass can be integrated into a frame. The frame serves as the main external support structure for the entire battery module 1001, providing stable support and installation for the battery module 1001. For example, the battery module 1001 can be installed at the desired location via the frame.

[0170] In the description of this specification, references to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0171] Furthermore, the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A solar cell, characterized in that, include: Battery substrate; A plurality of fine grids are disposed on the battery substrate, the plurality of fine grids are arranged along a first direction and all extend along a second direction, the first direction and the second direction intersect; A first busbar and a second busbar are disposed on the battery substrate and extend along the first direction. The first busbar is conductively connected to the fine grid of the first polarity, and the second busbar is conductively connected to the fine grid of the second polarity. The polarities of the first polarity and the second polarity are opposite. Each of the fine grids is provided with a first connection point and a second connection point arranged at intervals along the second direction, and both the first connection point and the second connection point are used for conductive connection with the connector; The plurality of fine gates includes at least one sub-fine gate group, the sub-fine gate group including two sub-fine gates with opposite polarities; Each of the sub-grids is provided with a third connection point located between the first connection point and the second connection point, and the first connection point and the second connection point are spaced apart from the third connection point.

2. The solar cell according to claim 1, characterized in that, It also includes an insulating member disposed on the battery substrate, the insulating member covering the third connection point, and the first connection point and the second connection point being exposed from the insulating member.

3. The solar cell according to claim 1, characterized in that, The area of ​​the first connection point is greater than the area of ​​the third connection point; and / or, the area of ​​the second connection point is greater than the area of ​​the third connection point.

4. The solar cell according to claim 1, characterized in that, The battery substrate includes a first edge and a second edge arranged along the first direction; In each of the sub-gate groups, the distance from the first polarity sub-gate to the first edge is less than the distance from the first polarity sub-gate to the second edge, and the distance from the second polarity sub-gate to the second edge is less than the distance from the second polarity sub-gate to the first edge.

5. The solar cell according to claim 4, characterized in that, The distance from the third connection point to the first edge is 1mm to 10mm; or, the distance from the third connection point to the second edge is 1mm to 10mm.

6. The solar cell according to claim 1, characterized in that, The battery substrate includes a third edge and a fourth edge arranged along the second direction, wherein the distance from the third connection point to the third edge is 1 mm to 10 mm; or, the distance from the third connection point to the fourth edge is 1 mm to 10 mm.

7. The solar cell according to claim 1, characterized in that, On each of the sub-grids, the distance from the third connection point to the adjacent first connection point is equal to the distance from the third connection point to the adjacent second connection point.

8. The solar cell according to claim 1, characterized in that, On each of the sub-grids, the distance from the third connection point to the adjacent first connection point is greater than the distance from the third connection point to the adjacent second connection point.

9. The solar cell according to claim 1, characterized in that, On the sub-grid with the same polarity as the first busbar, the distance from the third connection point to the first busbar is less than the distance from the third connection point to the second busbar; On the sub-grid with the same polarity as the second busbar, the distance from the third connection point to the second busbar is less than the distance from the third connection point to the second busbar.

10. The solar cell according to claim 1, characterized in that, On the sub-grid with the same polarity as the first busbar, the distance from the third connection point to the first busbar is greater than the distance from the third connection point to the second busbar; On the sub-grid with the same polarity as the second busbar, the distance from the third connection point to the second busbar is greater than the distance from the third connection point to the second busbar.

11. The solar cell according to claim 1, characterized in that, The dimension of the third connection point in the first direction is greater than the dimension of the fine gate in the first direction.

12. The solar cell according to claim 1, characterized in that, The area of ​​the first connection point is 0.5 mm. 2 Up to 1mm 2 ; and / or, the area of ​​the second connection point is 0.5 mm². 2 Up to 1mm 2 .

13. The solar cell according to claim 1, characterized in that, The area of ​​the third connection point is 1 mm. 2 Up to 4mm 2 .

14. A solar cell, characterized in that, include: Battery substrate; A plurality of fine grids are disposed on the battery substrate, the plurality of fine grids are arranged along a first direction and extend along a second direction, the first direction and the second direction intersect; A plurality of main grids are disposed on the battery substrate, the plurality of main grids are arranged along the second direction and all extend along the first direction, the main grids are electrically connected to the fine grids of the same polarity, and the main grids are insulated from the fine grids of the opposite polarity; Each of the main gates is provided with a first connection point and a second connection point arranged at intervals along the first direction, and both the first connection point and the second connection point are used for conductive connection with the connector; The plurality of main gates includes at least one sub-main gate group, the sub-main gate group including two sub-main gates with opposite polarities; Each of the sub-main grids is provided with a third connection point located between the first connection point and the second connection point, and the first connection point and the second connection point are spaced apart from the third connection point.

15. The solar cell according to claim 14, characterized in that, The dimension of the third connection point in the second direction is greater than the dimension of the main gate in the second direction.

16. The solar cell according to claim 14, characterized in that, It also includes an insulating member disposed on the battery substrate, the insulating member covering the third connection point, and the first connection point and the second connection point exposed from the insulating member.

17. The solar cell according to claim 14, characterized in that, The area of ​​the first connection point is greater than the area of ​​the third connection point; and / or, the area of ​​the second connection point is greater than the area of ​​the third connection point.

18. The solar cell according to claim 14, characterized in that, The battery substrate includes a first edge and a second edge arranged along the second direction; In each of the sub-gate groups, the distance from the first polarity sub-gate to the first edge is less than the distance from the first polarity sub-gate to the second edge, and the distance from the second polarity sub-gate to the second edge is less than the distance from the second polarity sub-gate to the first edge.

19. The solar cell according to claim 18, characterized in that, The distance from the third connection point to the first edge is 1mm to 10mm; or, the distance from the third connection point to the second edge is 1mm to 10mm.

20. The solar cell according to claim 14, characterized in that, The battery substrate includes a third edge and a fourth edge arranged along the first direction, wherein the distance from the third connection point to the third edge is 1 mm to 10 mm; or, the distance from the third connection point to the fourth edge is 1 mm to 10 mm.

21. The solar cell according to claim 14, characterized in that, On each of the sub-main gates, the distance from the third connection point to the adjacent first connection point is equal to the distance from the third connection point to the adjacent second connection point.

22. The solar cell according to claim 14, characterized in that, On each of the sub-main gates, the distance from the third connection point to the adjacent first connection point is greater than the distance from the third connection point to the adjacent second connection point.

23. The solar cell according to claim 14, characterized in that, The area of ​​the first connection point is 0.5 mm. 2 Up to 1mm 2 ; and / or, the area of ​​the second connection point is 0.5 mm². 2 Up to 1mm 2 .

24. The solar cell according to claim 14, characterized in that, The area of ​​the third connection point is 1 mm. 2 Up to 4mm 2 .

25. A battery assembly, characterized in that, The battery assembly includes a solar cell as described in any one of claims 1 to 24.

26. The battery assembly according to claim 25, characterized in that, It also includes a connector and an insulator, the connector being connected to the first connection point and the second connection point, the insulator covering the third connection point, and the first connection point and the second connection point being exposed from the insulator.

27. A photovoltaic system, characterized in that, The photovoltaic system includes a battery module as described in any one of claims 25 to 26.

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