Battery sheet and photovoltaic module

Abstract

The utility model relates to photovoltaic field provides a kind of battery piece and photovoltaic module, battery piece has outer periphery, outer periphery includes: first outer periphery curved surface and first outer periphery plane, first outer periphery curved surface and first outer periphery plane are oppositely arranged along first direction, and first outer periphery curved surface is protruding along the direction away from first outer periphery plane;Two second outer periphery planes, two second outer periphery planes oppositely set in the opposite sides of first outer periphery curved surface and first outer periphery plane along second direction, and the both ends of each second outer periphery are connected with first outer periphery curved surface and first outer periphery plane respectively, solve the problem that the light transmission effect between multiple battery pieces in the photovoltaic module in prior art is not uniform.

Description

Technical Field

[0001] This utility model relates to the photovoltaic field, and more specifically, to a solar cell and a photovoltaic module. Background Technology

[0002] With the continuous advancement of photovoltaic technology, agricultural / fishery solar-powered complementary modules have emerged as an new application scenario, and their design requirements are becoming increasingly prominent. These modules aim to simultaneously meet the needs of power generation and agricultural / fishery production, requiring them to effectively generate electricity while allowing sunlight to pass through to a certain extent to support the lighting needs of crop growth or aquaculture.

[0003] Currently, in conventional photovoltaic module designs, the solar cells are all square or rectangular. The light transmission of photovoltaic modules is mainly achieved through the spacing between the solar cells. This method leads to uneven light transmission, which may have an adverse effect on the growth of crops or livestock. Utility Model Content

[0004] This application provides a solar cell and a photovoltaic device thereof, which solves the problem of uneven light transmission among multiple solar cells in existing photovoltaic modules.

[0005] According to some embodiments of this application, one aspect of this application provides a battery cell having an outer peripheral surface, the outer peripheral surface including: a first outer peripheral curved surface and a first outer peripheral plane, the first outer peripheral curved surface and the first outer peripheral plane being disposed opposite to each other along a first direction, and the first outer peripheral curved surface protruding along a direction away from the first outer peripheral plane; and two second outer peripheral planes being disposed opposite to each other on opposite sides of the first outer peripheral curved surface and the first outer peripheral plane along a second direction, and both ends of each second outer peripheral plane being respectively connected to the first outer peripheral curved surface and the first outer peripheral plane.

[0006] In some embodiments, a protrusion is provided on the first outer peripheral curved surface. The protrusion is the highest point of the protrusion on the first outer peripheral curved surface, and the distance between the protrusion and the first outer peripheral plane is greater than or equal to 126 mm and less than or equal to 131 mm.

[0007] In some embodiments, the distance between the two second outer peripheral planes is greater than or equal to 177 mm and less than or equal to 188 mm.

[0008] According to some embodiments of this application, another aspect of this application provides a photovoltaic module, including a solar cell, wherein the solar cell is as described above, and the photovoltaic module includes: glass, wherein the glass is a rectangular glass plate having a long side and a short side perpendicular to each other; and a plurality of solar cells fixed on the glass such that a light-transmitting area for light to pass through is formed between any two adjacent solar cells and the glass.

[0009] In some embodiments, the photovoltaic module includes at least two cell groups arranged opposite each other along a second direction. Each cell group includes multiple cells, and the first outer peripheral surface of each cell in the same cell group has the same convex direction. Each pair of adjacent cells is connected by a solder strip.

[0010] In some embodiments, each cell group includes a plurality of cell columns arranged sequentially along a second direction, and each cell column includes a plurality of cells arranged sequentially along a first direction.

[0011] In some embodiments, the first distance L1 between two adjacent rows of cells is -2mm≤L1≤20mm.

[0012] In some embodiments, the second distance L2 between two battery cell groups arranged opposite each other along the second direction is greater than 0.

[0013] In some embodiments, in two battery cell groups arranged opposite each other along a second direction, the convex direction of the first outer peripheral surface of the battery cell in one battery cell group is opposite to the convex direction of the first outer peripheral surface of the battery cell in the other battery cell group.

[0014] In some embodiments, in two adjacent solar cells, the first outer peripheral curved surface of one solar cell forms a light-transmitting area with the first outer peripheral curved surface of the other solar cell; or, the first outer peripheral curved surface of one solar cell forms a light-transmitting area with the first outer peripheral plane of the other solar cell.

[0015] The technical solution provided in this application has at least the following advantages:

[0016] The solar cell in this application is obtained by processing a crystal rod and adopts a method of partially retaining the original curved surface of the crystal rod. That is, the first outer peripheral curved surface 110, compared with the conventional completely square solar cell, can retain more material during the processing from crystal rod to solar cell, thereby reducing the loss rate.

[0017] In applications such as solar-aquaculture hybrid systems, the light transmission between solar cells is crucial for illuminating the plants or water below. This application introduces a first outer peripheral curved surface 110, allowing the solar cells to form larger light transmission gaps during installation. This not only facilitates photosynthesis below but also results in more uniform light transmission, effectively solving the problem of uneven light transmission between multiple solar cells in existing photovoltaic modules. Attached Figure Description

[0018] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the drawings in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this application or in the conventional art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the battery cell of this application;

[0020] Figure 2 For two Figure 1 The diagram shows the structure of the first outer peripheral plane of the battery cell when it is connected.

[0021] Figure 3 This is a schematic diagram of the structure of an embodiment of the photovoltaic device of this application;

[0022] Figure 4 for Figure 3 A magnified view of point A shown below;

[0023] Figure 5 for Figure 3 A magnified view of point B shown.

[0024] 10. Outer peripheral surface; 110. First outer peripheral curved surface; 120. First outer peripheral plane; 130. Second outer peripheral plane;

[0025] 111. Protrusions;

[0026] 20. Glass; 210. Long side; 220. Short side;

[0027] 30. Light-transmitting area; 40. Cell array; 410. Cell column;

[0028] 100. Battery cells. Detailed Implementation

[0029] As can be seen from the background technology, in the conventional photovoltaic module design of the prior art, the cells are all square or rectangular. The light transmission of the photovoltaic module is mainly achieved through the spacing between the cells. This method leads to uneven light transmission, which may have an adverse effect on the growth of crops or livestock.

[0030] In the photovoltaic industry, silicon wafers are the core material of solar cells, and their size design has a significant impact on the production efficiency of cells and the performance of modules. Traditionally, in the process of cutting silicon wafers from silicon rods to obtain square or rectangular cells, it is usually necessary to cut them on all four sides. This process not only consumes a lot of time but also leads to significant waste of silicon material. Although the cut silicon material can be reused through secondary melting, the quality of the recycled silicon material is usually poor, affecting the performance and efficiency of subsequent cells.

[0031] like Figures 1 to 5 As shown, this application provides a battery cell having an outer peripheral surface 10, the outer peripheral surface 10 including: a first outer peripheral curved surface 110 and a first outer peripheral plane 120, the first outer peripheral curved surface 110 and the first outer peripheral plane 120 being disposed opposite each other along a first direction, and the first outer peripheral curved surface 110 protruding along a direction away from the first outer peripheral plane 120; and two second outer peripheral planes 130, the two second outer peripheral planes 130 being disposed opposite each other on opposite sides of the first outer peripheral curved surface 110 and the first outer peripheral plane 120 along a second direction, and both ends of each second outer peripheral plane 130 being connected to the first outer peripheral curved surface 110 and the first outer peripheral plane 120 respectively.

[0032] Preferably, the first direction is vertical and the second direction is horizontal.

[0033] The solar cell of this application adopts a method of partially retaining the original curved surface of the crystal rod. That is, the first outer peripheral curved surface 110, compared with the conventional completely squared solar cell, can retain more material during the processing from crystal rod to solar cell, thereby reducing the loss rate.

[0034] In applications such as solar-aquaculture hybrid systems, the light transmission between solar cells is crucial for illuminating the plants or water below. This application introduces a first outer peripheral curved surface 110, allowing the solar cells to form larger light transmission gaps during installation. This not only facilitates photosynthesis below but also results in more uniform light transmission.

[0035] Preferably, the two second outer peripheral planes 130 connecting the first outer peripheral curved surface 110 and the first outer peripheral plane 120 in this application help increase the structural strength of the cell, especially in the edge area of ​​the cell which is prone to microcracks due to uneven stress. The larger cell spacing between the first outer peripheral curved surface 110 and the first outer peripheral plane 120 in this application can reduce the stress of the solder strip on the edge of the cell, thereby reducing the risk of microcracks and breakage and improving the reliability of the cell.

[0036] Optionally, the radius of the first outer peripheral surface 110 is equal to the radius of the outer peripheral surface of the crystal rod.

[0037] By using a curved surface with the same radius as the crystal ingot, the shape of the silicon wafer is closer to the original outline of the crystal ingot, which reduces material waste in the slicing process, improves the utilization rate of raw materials, and reduces production costs. In addition, the shape of the curved surface can guide light to enter the cell at a better angle, reduce the reflection and scattering of direct light, increase the light absorption rate, and thus improve the photoelectric conversion efficiency of the module.

[0038] The curved surface design of this application, which has the same radius as the outer periphery of the crystal rod, helps the silicon wafer maintain its original structural strength after cutting, reduces the decline in mechanical properties caused by shape changes, and improves the ability of the component to resist external impacts and internal stresses.

[0039] like Figure 1 As shown, a protrusion 111 is provided on the first outer peripheral curved surface 110. The protrusion 111 is the highest point of the protrusion of the first outer peripheral curved surface 110. The distance between the protrusion 111 and the first outer peripheral plane 120 is greater than or equal to 126 mm and less than or equal to 131 mm.

[0040] The protrusions 111 in this application can increase the surface roughness of the solar cell to a certain extent, which helps to capture more incident light. When light encounters the protrusions, it may undergo multiple reflections and refractions, thereby increasing the residence time of light on the surface of the solar cell and improving the efficiency of light energy conversion into electrical energy. In particular, in the region of the first outer peripheral curved surface 110, the presence of protrusions 111 can further optimize the light path, reduce direct light reflection, and increase the light absorption rate.

[0041] Preferably, the distance between the two second outer peripheral planes 130 is greater than or equal to 177 mm and less than or equal to 188 mm.

[0042] In photovoltaic module design, the size of the cells directly affects the layout and arrangement of the module. This application, by limiting the distance between the second outer peripheral planes 130, can ensure that a certain number of cells can be reasonably arranged within a given module area, while taking into account the connection between cells and the layout of the solder ribbons, so as to achieve the best electrical and thermal performance.

[0043] This application effectively reduces material loss during the silicon rod to cell cutting process by retaining part of the original curved surface of the silicon rod and using cells of a specific width. Compared with traditional cells that are completely cut into square shapes, this design saves silicon material, reduces production costs, and improves material utilization while maintaining electrical performance.

[0044] like Figures 3 to 5As shown, this application also provides a photovoltaic module, including a solar cell 100, the solar cell 100 being the aforementioned solar cell, the photovoltaic module including: glass 20, the glass 20 being a rectangular glass plate having a long side 210 and a short side 220 that are perpendicular to each other; a plurality of solar cells 100, fixed on the glass 20, such that a light-transmitting area 30 for allowing light to pass through is formed between any two adjacent solar cells 100 and the glass 20.

[0045] Because of the use of solar cells with specific shapes and sizes, the solar cell 100 of this application can form larger light-transmitting areas 30 in the photovoltaic module compared with conventional solar cells. These light-transmitting areas 30 not only help the plants or aquaculture environment below to receive more natural light, but also reduce the direct reflection of light when the photovoltaic module is illuminated, and increase the residence time of light on the module surface, thereby improving the light energy capture efficiency of the solar cell 100.

[0046] In addition, by reasonably setting the spacing and light-transmitting area of ​​the solar cells 100 in the photovoltaic module, the internal stress caused by thermal expansion, mechanical impact, etc. can be reduced. The distance between the two second outer peripheral planes 130 is greater than or equal to 177 mm and less than or equal to 188 mm, which helps the thermal stress distribution of the solar cells 100 inside the photovoltaic module to be more uniform, reduce microcracks and damage, and improve the stability and reliability of the photovoltaic module.

[0047] The presence of the light-transmitting area 30 in this application not only meets the light transmittance requirements of agricultural / fishery photovoltaic complementary modules, but also provides greater flexibility for the appearance design of photovoltaic modules. The shape and size of the light-transmitting area 30 can be adjusted according to specific application scenarios, enabling photovoltaic modules to better integrate into the surrounding environment and improve environmental adaptability.

[0048] like Figure 3 As shown, the photovoltaic module includes at least two cell groups 40 arranged opposite each other along the second direction. Each cell group 40 includes multiple cells 100. The first outer peripheral curved surface 110 on each cell 100 in the same cell group 40 has the same convex direction. Each pair of adjacent cells 100 are connected by a solder strip.

[0049] This application arranges the solar cells 100 in groups, with the protrusion direction of the solar cells 100 in each group being the same. This ensures the effective arrangement of the solar cells 100 in the photovoltaic module. At the same time, adjacent solar cells 100 are connected by solder ribbons to form a continuous circuit, thereby improving the overall power output capability.

[0050] Preferably, the first outer peripheral curved surface 110 of each cell 100 in the cell array 40 has the same convex direction, which helps to ensure uniform distribution and management of light inside the module. The specific direction of the first outer peripheral curved surface 110 can guide light, reduce light reflection loss, increase light absorption on the cell 100, and thus improve the light energy conversion efficiency of the photovoltaic module.

[0051] Adjacent solar cells 100 are connected by welding ribbons, which can form a robust structure inside the photovoltaic module, enhance the photovoltaic module's ability to resist external mechanical shocks, reduce the displacement or damage of solar cells 100 caused by vibration or external forces, and improve the durability and lifespan of the photovoltaic module.

[0052] Specifically, each battery cell group 40 includes a plurality of battery cell rows 410 arranged sequentially along the second direction, and each battery cell row 410 includes a plurality of battery cells 100 arranged sequentially along the first direction.

[0053] In this application, the solar cells 100 are arranged in a two-dimensional array of columns and rows, which maximizes the utilization of the effective area of ​​the photovoltaic module. This arrangement helps to increase the number of solar cells 100 within a limited space, thereby increasing the total power output of the photovoltaic module. Furthermore, the orderly two-dimensional array layout contributes to the stability of the overall structure of the photovoltaic module, ensuring balanced support among the various components inside the photovoltaic module and reducing the risk of module deformation or solar cell breakage caused by uneven stress, thus improving the mechanical strength and seismic resistance of the module.

[0054] like Figure 4 As shown, the first distance L1 between two adjacent battery cell rows 410 is -2mm≤L1≤20mm.

[0055] Preferably, the adjustable range of L1 allows module designers to freely adjust it according to different application scenarios and lighting requirements, enhancing the applicability of the module in different environments. For example, in areas with sufficient sunlight, L1 can be reduced to increase the density of solar cells and improve the output power of the module; while in scenarios requiring more light transmission, L1 can be increased to ensure sufficient light transmission.

[0056] like Figure 5 As shown, the second distance L2 between two battery cell groups 40 arranged opposite each other along the second direction is greater than 0. The interval between the two battery cell groups 40 can form a continuous light-transmitting area 30. This not only helps the plants or aquaculture environment below to receive more natural light, but also ensures a more uniform light distribution, which is conducive to improving the efficiency of plant photosynthesis or the healthy growth of aquaculture organisms. The design of L2 being greater than 0 promotes air circulation between the inside of the module and the outside, which helps to dissipate heat inside the module quickly, reduces the impact of high temperature on the performance of the battery cells, improves the working efficiency of the photovoltaic module and extends its service life.

[0057] Specifically, in the two battery cell groups 40 arranged opposite to each other along the second direction, the protrusion direction of the first outer peripheral curved surface 110 on the battery cell 100 in one battery cell group 40 is opposite to the protrusion direction of the first outer peripheral curved surface 110 on the battery cell 100 in the other battery cell group 40.

[0058] Specifically, in two adjacent battery cells 100, the first outer peripheral curved surface 110 of one battery cell 100 and the first outer peripheral curved surface 110 of the other battery cell 100 form a light-transmitting area 30; or, the first outer peripheral curved surface 110 of one battery cell 100 and the first outer peripheral plane 120 of the other battery cell 100 form a light-transmitting area 30.

[0059] By adjusting the arrangement and shape design of the solar cells 100, the position and size of the light-transmitting area 30 can be flexibly controlled to meet the needs of different photovoltaic application scenarios. For example, in agricultural / fishery solar-powered complementary projects, it is necessary to ensure the lighting conditions for crops or aquaculture. Furthermore, the special combination between curved surfaces or between curved surfaces and planes can change the light path entering the module, optimize the scattering and capture effect of light on the module surface, reduce direct light and reflection losses, and improve the photoelectric conversion efficiency of the photovoltaic module.

[0060] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0061] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0062] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0063] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0064] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to 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 the embodiments of this application.

[0065] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0066] In the accompanying drawings corresponding to the embodiments of this application, the thickness and area of ​​the layers are enlarged for better understanding and ease of description. When describing a component (such as a layer, film, region, or substrate) on or on the surface of another component, the component may be "directly" located on the surface of the other component, or there may be a third component between the two components. Conversely, when describing a component on the surface of another component, or when another component is formed or disposed on the surface of a component, it indicates that there is no third component between the two components. Furthermore, when describing a component as being "generally" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a portion of the edge of the entire surface.

[0067] In the description of the embodiments of this application, when a component "includes" another component, other components are not excluded unless otherwise stated, and other components may be further included. Furthermore, when a component such as a layer, film, region, or plate is referred to as being "on / located" on another component, it can be "directly on" the other component (i.e., located on the surface of the other component with no other components between them), or another component may be present therein. Moreover, when a component such as a layer, film, region, or plate is "directly located" on another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it indicates that no other components are located therein.

[0068] The terminology used in the description of the various embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various embodiments and the appended claims, the term "part" is also intended to include the plural form unless the context clearly indicates otherwise. Components include layers, films, regions, or plates, etc.

[0069] The embodiments of this application will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this application to facilitate a better understanding of the application. However, the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0070] Those skilled in the art will understand that the above embodiments are specific examples of implementing this application, and in practical applications, various changes in form and detail can be made without departing from the spirit and scope of this application. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of this application; therefore, the scope of protection of this application should be determined by the scope defined in the claims.

Claims

1. A type of battery cell, characterized in that, It has an outer peripheral surface (10), said outer peripheral surface (10) comprising: A first outer peripheral curved surface (110) and a first outer peripheral plane (120) are arranged opposite to each other along a first direction, and the first outer peripheral curved surface (110) protrudes in a direction away from the first outer peripheral plane (120); Two second peripheral planes (130) are disposed opposite to each other on the first peripheral curved surface (110) and the first peripheral plane (120) along the second direction, and both ends of each second peripheral plane (130) are respectively connected to the first peripheral curved surface (110) and the first peripheral plane (120).

2. The battery cell according to claim 1, characterized in that, The first outer peripheral curved surface (110) is provided with a protrusion (111), the protrusion (111) is the highest point of the protrusion of the first outer peripheral curved surface (110), and the distance between the protrusion (111) and the first outer peripheral plane (120) is greater than or equal to 126 mm and less than or equal to 131 mm.

3. The battery cell according to claim 1, characterized in that, The distance between the two second outer peripheral planes (130) is greater than or equal to 177 mm and less than or equal to 188 mm.

4. A photovoltaic module, characterized in that, The photovoltaic module includes a solar cell (100), wherein the solar cell (100) is a solar cell according to any one of claims 1 to 3, and the photovoltaic module includes: Glass (20), wherein the glass (20) is a rectangular glass plate having a long side (210) and a short side (220) that are perpendicular to each other; Multiple of the battery cells (100) are fixed to the glass (20) such that a light-transmitting area (30) for light to pass through is formed between any two adjacent battery cells (100) and the glass (20).

5. The photovoltaic module according to claim 4, characterized in that, The photovoltaic module includes at least two cell groups (40) arranged opposite each other along the second direction. Each cell group (40) includes a plurality of cells (100). The first outer peripheral surface (110) on each cell (100) in the same cell group (40) has the same convex direction. Each pair of adjacent cells (100) are connected by a solder strip.

6. The photovoltaic module according to claim 5, characterized in that, Each of the battery cell groups (40) includes a plurality of battery cell columns (410) arranged sequentially along the second direction, and each of the battery cell columns (410) includes a plurality of battery cells (100) arranged sequentially along the first direction.

7. The photovoltaic module according to claim 6, characterized in that, The first distance L1 between two adjacent rows of battery cells (410) is -2mm≤L1≤20mm.

8. The photovoltaic module according to claim 5, characterized in that, The second distance L2 between the two battery cell groups (40) arranged opposite each other along the second direction is greater than 0.

9. The photovoltaic module according to claim 5, characterized in that, In the two battery cell groups (40) arranged opposite to each other along the second direction, the convex direction of the first outer peripheral surface (110) on the battery cell (100) in one battery cell group (40) is opposite to the convex direction of the first outer peripheral surface (110) on the battery cell (100) in the other battery cell group (40).

10. The photovoltaic module according to claim 5, characterized in that, In two adjacent solar cells (100), The first outer peripheral surface (110) of one of the battery cells (100) and the first outer peripheral surface (110) of the other battery cell (100) form the light-transmitting area (30); or, The first peripheral curved surface (110) of one of the battery cells (100) and the first peripheral plane (120) of the other battery cell (100) form the light-transmitting area (30).

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