Solar cell module and method for manufacturing the same

Abstract

The present application relates to a solar cell module and a manufacturing method thereof. By designing a backplane light-guiding grid layer, the maximum utilization of light in the gaps between cells is achieved. The module includes a front glass panel, a first adhesive film layer, a cell string, a second adhesive film layer and a backplane. The backplane is provided with a light-guiding grid layer corresponding to the gaps between cells. The light-guiding grid layer is composed of a first prism layer, a first light-guiding layer, a transition layer, a second light-guiding layer and a second prism layer. By designing a multi-layer structure, optical principles are used to guide light to be reflected and scattered multiple times in the gaps between cells, and finally to be guided to the surface of the cells, thereby improving the light absorption rate. Among them, the transition layer adopts a gradient refractive index design to further enhance the light guiding efficiency. At the same time, the present application also provides a corresponding manufacturing method, including steps such as connecting cells in series, setting a light-guiding grid layer, stacking and laminating, to ensure efficient manufacturing and assembly of the module.

Description

Technical Field

[0001] The present application relates to the technical field of solar cells, and in particular to a solar cell assembly and a manufacturing method thereof. Background Art

[0002] With the growing global demand for renewable energy, the technological development and optimization of solar cell modules, as the core components of solar power generation systems, are particularly important. In recent years, solar cell technology has made remarkable achievements, especially in conversion efficiency, material innovation and component design.

[0003] The conversion efficiency of solar cells is an important indicator to measure their performance. At present, under laboratory conditions, the efficiency of silicon-based solar cells has reached a relatively high level. In terms of module design, the utilization rate of light by solar cell modules has been improved by optimizing the arrangement of cells, adding reflective layers, and using focusing technology. At the same time, the double-sided power generation technology has gradually matured, that is, not only the front side of the cell receives sunlight, but also the back side can effectively absorb scattered light and reflected light through special design, thereby further improving the power generation efficiency.

[0004] Although solar cell technology has made significant progress, it still faces some challenges and problems that need to be solved. How to further optimize the light distribution between cells, reduce light loss, and how to more effectively utilize the scattered light and reflected light on the back are still hot topics and difficulties in current research. Summary of the invention

[0005] The purpose of the present application is to provide a solar cell assembly, which optimizes the light distribution between the cells, can reduce light loss, and thus more effectively utilize light. The solar cell assembly of the present application includes a front glass panel, a first adhesive film layer, a cell string, a second adhesive film layer, and a back panel;

[0006] The front glass panel, the first adhesive film layer, the battery string, the second adhesive film layer and the back panel are stacked and laminated in sequence from top to bottom;

[0007] The adhesive film layer is one or more combinations of EVA (polyethylene-polyvinyl acetate copolymer), POE (polyolefin elastomer), and PVB (polyvinyl butyral).

[0008] A light guide grid layer is formed on the back plate, and the light guide grid layer corresponds to the position of the gap between the battery cells in the battery string;

[0009] Among them, the light guide grid layer includes a first prism layer, a first light guide layer, a transition layer, a second light guide layer and a second prism layer arranged in sequence from top to bottom, the surface where the first light guide layer contacts the first prism layer and the surface where the second light guide layer contacts the second prism layer are planes, and the bonding surface between the first light guide layer and the transition layer and the bonding surface between the second light guide layer and the transition layer have a concave-convex shape.

[0010] In one of the embodiments, the width of the light guide grid layer is 105%-120% of the gap between the battery cells in the battery string.

[0011] In one of the embodiments, the back plate includes a receiving groove, the position of the receiving groove corresponds to the position of the gap between the battery cells in the battery string, and the light guide grid layer is arranged in the receiving groove.

[0012] In one of the embodiments, the second light guide layer and the second prism layer are completely accommodated in the groove space of the accommodating groove, and the first prism layer and the first light guide layer protrude from the upper surface of the back plate.

[0013] In one of the embodiments, the light guide grid layer is bonded to the receiving groove by EVA glue.

[0014] In one embodiment, the refractive index of the transition layer is smaller than the refractive indexes of the first light guiding layer and the second light guiding layer.

[0015] In one of the embodiments, a frame is further included, and the frame is arranged around the glass panel, the first adhesive film layer, the battery string, the second adhesive film layer and the back plate to fix the various layers.

[0016] In addition, the present application also provides a method for manufacturing a solar cell assembly, comprising:

[0017] Connecting multiple battery cells in series and / or in parallel to form a battery string;

[0018] A light guide grid layer is arranged on the back plate, wherein the light guide grid layer includes a first prism layer, a first light guide layer, a transition layer, a second light guide layer and a second prism layer arranged in sequence from top to bottom, a surface where the first light guide layer contacts the first prism layer and a surface where the second light guide layer contacts the second prism layer are planes, and a bonding surface between the first light guide layer and the transition layer and a bonding surface between the second light guide layer and the transition layer have a concave-convex shape;

[0019] The backplane, the second adhesive film layer, the battery string, the first adhesive film layer, and the front glass panel are stacked in sequence, wherein the light guide grid layer corresponds to the position of the gap between the battery cells in the battery string;

[0020] After the stacking is completed, it is laminated to form a solar cell module.

[0021] In one of the embodiments, the manufacturing method further includes opening a receiving groove on the back plate, and placing the light guide grid layer in the receiving groove.

[0022] In one embodiment, the depth of the accommodating groove is the sum of the thicknesses of the second light guide layer and the second prism layer.

[0023] Compared with the prior art, the present application has the following beneficial effects: the present application sets a light-guiding grid layer on the back panel, which is designed by a multi-layer structure, including a first prism layer, a first light-guiding layer, a transition layer, a second light-guiding layer and a second prism layer, which can effectively capture and guide the light in the gaps between the cells. Through the synergistic effect of the prism layer and the light-guiding layer, the light that may have been lost is converged toward the cell, thereby significantly reducing light loss and improving the utilization efficiency of light. Experimental data show that compared with the traditional design, the present application can increase the light capture rate by about 7%-15%. Due to the introduction of the light-guiding grid layer, the gap light that could not be effectively utilized can be fully utilized, which directly improves the overall power generation efficiency of the solar cell module. Under the same lighting conditions, the solar cell module of the present application can generate more electricity and bring higher economic benefits to users.

[0024] In addition, by providing a receiving groove on the back panel to accommodate the light-guiding grid layer, and using EVA glue for bonding, not only the stable installation of the light-guiding grid layer is ensured, but also the overall structural strength of the component is enhanced. The design of the transition layer makes the light smoother when transmitting between different media, reduces the energy loss caused by reflection and scattering, and improves the durability and long-term stability of the component. The manufacturing method of the present application has clear steps and is easy to implement. By pre-opening a receiving groove on the back panel and placing the light-guiding grid layer, and then stacking and laminating with other layers in sequence, the manufacturing process is effectively simplified. Due to the reduction of light loss, the power generation efficiency is improved, and the cost of unit electric energy is indirectly reduced. With significant advantages in light utilization, power generation efficiency, durability and manufacturing cost, the present application has been improved by optimizing light distribution, improving power generation efficiency, enhancing durability and stability, and simplifying manufacturing processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of a solar cell assembly in one embodiment of the present application;

[0026] Figure 2 is a schematic structural diagram of a light-guiding grid layer of a solar cell assembly in one embodiment of the present application;

[0027] Figure 3is a light path diagram of the interaction between the light ray and the light guide grid layer when the light ray is incident from the front in the embodiment of the present application;

[0028] Figure 4 is a light path diagram of the interaction between the light ray incident from the back and the light guide grid layer in the embodiment of the present application;

[0029] Figure 5 is a schematic structural diagram of a solar cell assembly in another embodiment of the present application;

[0030] Figure 6 It is a flow chart of the method for manufacturing a solar cell module of the present application.

[0031] Explanation of the reference numerals: 100, front glass panel; 200, first adhesive film layer; 300, battery string; 400, second adhesive film layer; 500, back panel; 600, light guide grid layer; 610, first prism layer; 620, first light guide layer; 630, transition layer; 640, second light guide layer; 650, second prism layer. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some structures related to the present application are shown in the accompanying drawings, rather than all structures. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0033] The terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0034] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0035] With the rapid growth of global demand for clean and renewable energy, the design and optimization of solar cell modules have become the focus of scientific research and industry. This application provides a new solar cell module, which achieves efficient use of light between cells and on the back through structural design, indicating that solar cell technology has improved in terms of improving light capture rate, power generation efficiency and module durability, which helps to improve the overall performance of solar power generation systems. Please refer to Figures 1 to 5 As shown, a solar cell assembly in a preferred embodiment of the present application can make full use of the light between the cells through a corresponding cell assembly structure. The solar cell assembly includes a front glass panel 100, a first adhesive film layer 200, a cell string 300, a second adhesive film layer 400 and a back plate 500. The front glass panel 100, the first adhesive film layer 200, the cell string 300, the second adhesive film layer 400 and the back plate 500 are sequentially stacked from top to bottom and laminated. A light guide grid layer 600 is formed on the back plate 500. The light guide grid layer 600 is The position of the gap between the cells in the cell string 300, wherein the light guide grid layer 600 includes a first prism layer 610, a first light guide layer 620, a transition layer 630, a second light guide layer 640 and a second prism layer 650 arranged in sequence from top to bottom, the surface where the first light guide layer 620 contacts the first prism layer 610 and the surface where the second light guide layer 640 contacts the second prism layer 650 are planes, and the bonding surface between the first light guide layer 620 and the transition layer 630 and the bonding surface between the second light guide layer 640 and the transition layer 630 have a concave-convex shape. The backplane 500 of the present application is a light-transmitting backplane, and the solar cell module belongs to a bifacial module.

[0036] The solar cell module of the present application, through the stacked structure and the light-guiding grid layer 600 design of the back plate 500, realizes the efficient capture and utilization of light between the cells, improves the photoelectric conversion efficiency of the module, and ensures the close combination and overall stability between the layers through advanced lamination technology. The light-guiding grid layer 600 design on the back plate 500 corresponds to the tiny gaps between the cells in the battery string 300, which effectively solves the problem of insufficient light utilization in these areas in traditional modules. The light-guiding grid layer 600 is composed of multiple layers of fine structures, which are, from top to bottom, the first prism layer 610, the first light-guiding layer 620, the transition layer 630, the second light-guiding layer 640 and the second prism layer 650. This multi-level design makes full use of optical principles. The planar contact between the first light guide layer 620 and the first prism layer 610, and the second light guide layer 640 and the second prism layer 650 ensures the smooth entry of light. The concave and convex bonding surfaces between the first light guide layer 620 and the transition layer 630, and the second light guide layer 640 and the transition layer 630, through precise optical design, achieve multiple reflections and scattering of light, effectively guiding the light that might have escaped to the surface of the cell, thereby maximizing the use of light between the cells. The light guide grid layer 600 effectively captures and guides the light between the cells, significantly improving the light absorption rate of the component, thereby improving the photoelectric conversion efficiency, so that the component can generate more electricity under the same lighting conditions. Due to the improvement of the photoelectric conversion efficiency, the number of components required for a solar power generation system with the same power demand is reduced, thereby reducing the overall construction cost and operation and maintenance cost of the system and improving the economic efficiency of the project.

[0037] For related rays see Figure 3 , Figure 3 6 is a light path diagram of the interaction between the light guide grid layer and the light incident from the front in the embodiment of the present application. By adjusting the materials of the first prism layer 610, the first light guide layer 620, and the transition layer 630, the refractive index of the three is controlled. When the light reaches the light guide grid layer 600 from the front, it can enter the first light guide layer 620 through the prism. The light will be reflected at the interface between the first light guide layer 620 and the transition layer 630, but will not enter the transition layer 630. The partially reflected light ( Figure 3 Light 1) can enter other structures (such as adhesive film or back plate) from the side of the first light guide layer 620, and part of the reflected light will reach the interface between the first prism layer 610 and the first light guide layer 620. This part of the light will be totally reflected and enter other structures (such as adhesive film or back plate) from the side of the first light guide layer 620. Figure 3 Light 2) will also pass through the prism layer again and return to the first light guide layer 620 ( Figure 3In the middle light 3, it should be noted that the above light 1-3 is only a schematic diagram of the principle. The actual process is a collection of various complex light paths. These situations all achieve the transfer of light between the gaps to the cell. In contrast, when the structure of the present application is not set, part of the light will pass through the solar cell assembly and cannot be effectively used.

[0038] Please read further Figure 4 , Figure 4 6 is a light path diagram of the interaction between the light incident from the back and the light guide grid layer in the embodiment of the present application. The light incident from the back will also enter the second light guide layer 640 through the second prism layer 650. The light from the back is transmitted through a similar principle ( Figure 4 Light 4, light 5, and light 6) are used to divert light that would otherwise pass through the gap and the solar cell assembly to the cell.

[0039] Specifically, the width of the light-guiding grid layer 600 is 105%-120% of the gap between the cells in the cell string 300. By setting the width of the light-guiding grid layer 600 to be slightly larger than the width of the cell gap, it is ensured that the grid layer can fully cover and effectively guide the light in the gap area, avoiding the light from escaping directly to the outside of the component, and ensuring that the light can be efficiently guided to the surface of the cell along the specific path of the grid layer, thereby achieving the maximum capture and utilization of the gap light. The appropriately widened light-guiding grid layer 600 structurally provides more scattering and mixing opportunities for light. When the light enters the grid layer, it will be reflected and scattered multiple times on its concave and convex bonding surface. This process not only increases the propagation path of the light inside the component, but also helps to distribute the light more evenly to the cell, thereby improving the utilization rate of the light and the photoelectric conversion efficiency. In addition, the design also has a certain degree of flexibility, and can be fine-tuned according to the actual size of the cell gap in different application scenarios, so that the optimized solar cell module of the present application is more adaptable to diverse market demands and installation environments.

[0040] Specifically, the back plate 500 includes a receiving groove, the position of the receiving groove corresponds to the position of the gap between the battery cells in the battery string 300, and the light-guiding grid layer 600 is arranged in the receiving groove. By setting a receiving groove corresponding to the gap between the battery cells on the back plate 500 and accurately installing the light-guiding grid layer 600 therein, it is ensured that light can directly and efficiently enter the grid layer for scattering and guidance, thereby minimizing the ineffective propagation path of light inside the component, and improving the light utilization rate and photoelectric conversion efficiency. The integrated design forms a stable connection between the light-guiding grid layer 600 and the back plate 500, which not only enhances the overall structural strength of the component, but also makes the component more compact in appearance. Integrating the light-guiding grid layer 600 in the receiving groove on the back plate 500 simplifies the installation process of the component. The installer only needs to align the grid layer with the receiving groove and fix it, without the need for complex adjustment or calibration.

[0041] With regard to the scheme of setting a receiving groove, its main function is to align and fix the light guide grid layer. The principle of light action on the front side is consistent with that without setting a receiving groove, while the light on the back side enters the back panel through the second light guide layer 640 and the second prism layer 650, enters the adhesive layer through the back panel material, and reaches the battery cells in the battery string 300.

[0042] In order to further optimize the light guiding effect and the overall performance of the assembly, the second light guide layer 640 and the second prism layer 650 are completely contained in the groove space of the containing groove, and the first prism layer 610 and the first light guide layer 620 protrude from the upper surface of the back plate 500. The second light guide layer 640 and the second prism layer 650 are completely embedded in the containing groove, ensuring that the light can be quickly captured and guided to the surface of the cell after entering the grid layer. At the same time, since these two layers are completely located in the groove, direct interference from the external environment is avoided, and the stability and efficiency of light guidance are guaranteed. The protruding design of the first prism layer 610 and the first light guide layer 620 further enhances the scattering effect of the light when entering the grid layer, so that the light can be evenly distributed on the cell in a larger range, thereby improving the photoelectric conversion efficiency. The layered embedded and protruding design makes the installation process of the light guide grid layer 600 more convenient. The installer can easily align the grid layer with the containing groove and fix it, without worrying about light leakage or efficiency loss caused by improper installation. This design also has a certain degree of flexibility. The second light guide layer 640 and the second prism layer 650 are completely embedded in the receiving groove in order to utilize the "isolation" effect of the transition layer 630 (i.e., physically distinguish the front and back light), and completely confine the back light to the back panel to avoid confusion and uncontrollability of the light path.

[0043] In order to ensure a stable connection between the light guide grid layer 600 and the back panel 500, and to achieve efficient light guidance and utilization, the light guide grid layer 600 is bonded to the receiving groove by EVA glue. EVA glue is known for its excellent bonding performance and sealing performance, and can ensure that a strong bonding interface is formed between the light guide grid layer 600 and the back panel 500. Through the bonding effect of EVA glue, the light guide grid layer 600 and the back panel 500 form a tight whole. This structural integration not only enhances the overall stability of the component, but also enables the component to maintain good performance when subjected to external environmental factors (such as wind pressure, temperature changes, etc.). The bonding method of EVA glue ensures seamless connection between the light guide grid layer 600 and the back panel 500, and reduces the loss of light when it propagates between the grid layer and the back panel 500.

[0044] In order to further improve the guiding efficiency of the light-guiding grid layer 600 for light, the present application adopts a unique gradient refractive index strategy in the design of the transition layer 630. Specifically, the refractive index of the transition layer 630 is less than the refractive index of the first light-guiding layer 620 and the second light-guiding layer 640. Since the refractive index of the transition layer 630 is lower than that of the first light-guiding layer 620 and the second light-guiding layer 640, when the light enters the transition layer 630 with a low refractive index from the light-guiding layer with a high refractive index, part of the light will be bound in the light-guiding layer and continue to propagate due to the satisfaction of the total reflection condition. This effect effectively reduces the reflection loss of the light at the interface between the light-guiding layer and the transition layer 630, enhances the binding ability of the light in the light-guiding grid layer 600, and improves the utilization efficiency of the light. The transition layer 630 with a gradient refractive index design can also guide the light to propagate in a specific direction. When the light propagates in the light-guiding layer to the transition layer 630, due to the change in the refractive index, the propagation direction of the light will be deflected and tend to propagate toward the surface of the battery cell. This directional guidance helps to guide more light to the effective absorption area of ​​the cell, thereby improving the photoelectric conversion efficiency. By introducing the transition layer 630 with a gradient refractive index design, the optical performance of the light-guiding grid layer 600 of the present application is significantly improved. It can not only more effectively capture and guide the light in the gap between the cells, but also reduce light loss and improve photoelectric conversion efficiency by optimizing the light propagation path.

[0045] In order to ensure the stable connection between the layers in the solar cell module and the integrity of the overall structure, the present application also includes a frame, which is arranged around the glass panel, the first adhesive film layer 200, the battery string 300, the second adhesive film layer 400 and the back plate 500 to fix the various layers. The introduction of the frame provides a solid peripheral support for the solar cell module, significantly enhancing the overall structural strength and stability of the module. In harsh climatic conditions, such as strong winds, heavy snow or environments with large temperature differences, the frame can effectively resist external pressure, prevent the module from deformation or damage, and ensure the long-term stable operation of the module.

[0046] Please read further Figure 6 The present application also provides a method for manufacturing a solar cell assembly, comprising:

[0047] Connecting multiple battery cells in series and / or in parallel to form a battery string 300;

[0048] A light guide grid layer 600 is arranged on the back plate 500, wherein the light guide grid layer 600 includes a first prism layer 610, a first light guide layer 620, a transition layer 630, a second light guide layer 640 and a second prism layer 650 which are arranged in sequence from top to bottom, the surface where the first light guide layer 620 contacts the first prism layer 610 and the surface where the second light guide layer 640 contacts the second prism layer 650 are planes, the bonding surface between the first light guide layer 620 and the transition layer 630 and the bonding surface between the second light guide layer 640 and the transition layer 630 have a concave-convex shape, and the back plate 500, the second adhesive film layer 400, the battery string 300, the first adhesive film layer 200 and the front glass panel 100 are stacked in sequence, wherein the light guide grid layer 600 corresponds to the position of the gap between the battery cells in the battery string 300, and after the stacking is completed, lamination is performed to form a solar cell module.

[0049] First, multiple high-efficiency cells are connected in a precise series and / or parallel manner to form a compact and efficient cell string 300. On the backplane 500, an advanced manufacturing process is used to accurately set the light guide grid layer 600, which is composed of a multi-layer structure, from top to bottom, the first prism layer 610, the first light guide layer 620, the transition layer 630, the second light guide layer 640 and the second prism layer 650. In particular, the contact surface between the first light guide layer 620 and the first prism layer 610, and the second light guide layer 640 and the second prism layer 650 is designed to be a plane to ensure smooth and efficient light when entering the light guide layer. The bonding surface between the first light guide layer 620 and the transition layer 630, and the second light guide layer 640 and the transition layer 630 adopts a unique concave-convex shape design, which can more effectively guide the light to be reflected and scattered multiple times in the light guide layer, thereby increasing the propagation path of the light in the gap between the cells and improving the capture rate of the light. After the preparation of the light guide grid layer 600 is completed, the backplane 500, the second adhesive film layer 400, the battery string 300, the first adhesive film layer 200 and the front glass panel 100 are stacked in sequence according to the process requirements. In this process, special attention is paid to the precise correspondence between the light guide grid layer 600 and the gap between the battery cells in the battery string 300 to ensure that the light guide grid layer 600 can fully play its light guiding and enhancement role. After the stacking is completed, the advanced lamination process is used to heat and pressurize the components to achieve a close bond between the layers, ensuring the full curing of the adhesive film and the improvement of the bonding strength. At the same time, the temperature and pressure control during the lamination process also ensures the stability and consistency of the performance of the battery cells, the light guide grid layer 600 and other component materials. Through the precise design and precise positioning of the light guide grid layer 600, the effective capture and guidance of the light in the gap between the battery cells is achieved. The concave and convex bonding surface design increases the number of reflections and scattering of light in the light guide layer, thereby improving the utilization rate and capture efficiency of light. The optimized light-guiding grid layer 600 is combined with the cell integration method, so that more light can be accurately projected onto the effective absorption area of ​​the cell, thereby improving the photoelectric conversion efficiency and the overall power generation capacity of the component.

[0050] While pursuing efficient light capture and conversion, the manufacturing method also includes opening a receiving groove on the back panel 500 and placing the light guide grid layer 600 in the receiving groove. At a predetermined position on the back panel 500, a series of receiving grooves that match the shape and size of the light guide grid layer 600 are opened using precision machining technology. The design of these receiving grooves must ensure that they can both firmly support the light guide grid layer 600 and minimize obstruction to light propagation. The prepared light guide grid layer 600 is precisely placed in the receiving groove on the back panel 500 according to the preset position and direction. During this process, it is necessary to ensure that the light guide grid layer 600 fits tightly with the receiving groove without gaps or misalignment.

[0051] Specifically, the depth of the receiving groove is the sum of the thicknesses of the second light guide layer 640 and the second prism layer 650. By setting the depth of the receiving groove to match the total thickness of the second light guide layer 640 and the second prism layer 650, the light guide grid layer 600 can be perfectly embedded in the back panel 500 to form a seamless integrated overall structure, eliminating the tiny gaps between layers, reducing the scattering and loss of light in these gaps, and improving the transmission efficiency of light. At the same time, it also enhances the coupling between the layers inside the component, making the overall structure more stable and reliable. The precise depth design of the receiving groove enables the light guide grid layer 600 to fit closely to the gaps between the cells, thereby more effectively guiding the light to propagate in these areas. During the multiple reflections and scattering between the light guide layer and the prism layer, the light can be more fully captured by the cells and converted into electrical energy. This optimization of the optical path further improves the photoelectric conversion efficiency of the component.

[0052] As can be seen from the foregoing, this application proposes a new solar cell module and a manufacturing method thereof, which aims to improve the efficiency of the module in capturing and utilizing light through refined structural design and manufacturing processes, thereby enhancing the photoelectric conversion performance and overall power generation capacity. The solar cell module integrates a front glass panel, a first adhesive film layer, a high-efficiency battery string, a second adhesive film layer, and a backplane with a light-guiding grid layer. The layers are tightly combined through precise stacking and lamination processes to form a stable and efficient photoelectric conversion unit.

[0053] The core of this application is the design of the light-guiding grid layer on the backplane, which precisely corresponds to the gap between the cells in the cell string. Through the superposition of multiple layers of fine structures (first prism layer, first light-guiding layer, transition layer, second light-guiding layer and second prism layer), the maximum capture and guidance of the light in the gap is achieved. The planar contact between the first and second light-guiding layers and the prism layer ensures that the light enters smoothly, while the concave-convex bonding surface between the light-guiding layer and the transition layer uses optical principles to effectively guide the light to the surface of the cell through multiple reflections and scattering, significantly improving the light absorption rate and photoelectric conversion efficiency.

[0054] In addition, this application also opens a receiving groove on the back panel that matches the light-guiding grid layer, and accurately embeds the grid layer into it, achieving seamless integration of the structure and direct and efficient guidance of light, which not only simplifies the installation process, but also enhances the overall stability and durability of the component. At the same time, by precisely controlling the depth of the receiving groove, it is ensured that the light-guiding grid layer can perfectly fit the gap between the cells, further optimizing the optical path and improving the photoelectric conversion efficiency. In the design of the transition layer, this application introduces a gradient refractive index strategy, which effectively reduces the reflection loss of light at the interface between the light-guiding layer and the transition layer, and guides the light to propagate toward the surface of the cell, further improving the utilization efficiency of light.

[0055] In summary, the solar cell module of the present application achieves efficient capture and utilization of light between the cell panels through the innovative design of the stacked structure and the light-guiding grid layer, significantly improving the photoelectric conversion efficiency and overall performance of the module. At the same time, through precise manufacturing processes and structural optimization, the stability, durability and economy of the module are ensured.

[0056] The above is only a specific implementation of the present application, and any other improvements made based on the concept of the present application are deemed to be within the protection scope of the present application.

Claims

1. A solar cell module, characterized in that: It comprises a front glass panel (100), a first adhesive film layer (200), a battery string (300), a second adhesive film layer (400) and a back panel (500); The front glass panel (100), the first adhesive film layer (200), the battery string (300), the second adhesive film layer (400) and the back panel (500) are sequentially stacked from top to bottom and then laminated; A light guide grid layer (600) is formed on the back plate (500), and the light guide grid layer (600) corresponds to the position of the gap between the battery sheets in the battery string (300); The light-guiding grid layer (600) comprises a first prism layer (610), a first light-guiding layer (620), a transition layer (630), a second light-guiding layer (640) and a second prism layer (650) which are arranged in sequence from top to bottom; the surface where the first light-guiding layer (620) contacts the first prism layer (610) and the surface where the second light-guiding layer (640) contacts the second prism layer (650) are planes; and the bonding surface between the first light-guiding layer (620) and the transition layer (630) and the bonding surface between the second light-guiding layer (640) and the transition layer (630) have concave-convex shapes.

2. The solar cell assembly according to claim 1, characterized in that: The width of the light guide grid layer (600) is 105%-120% of the gap between the battery sheets in the battery string (300).

3. The solar cell assembly according to claim 1, characterized in that: The back plate (500) comprises a receiving groove, the position of the receiving groove corresponds to the position of the gap between the battery sheets in the battery string (300), and the light guide grid layer (600) is arranged in the receiving groove.

4. The solar cell assembly according to claim 3, characterized in that: The second light guide layer (640) and the second prism layer (650) are completely accommodated in the groove space of the accommodation groove, and the first prism layer (610) and the first light guide layer (620) protrude from the upper surface of the back plate (500).

5. The solar cell assembly according to claim 3, characterized in that: The light guide grid layer (600) is bonded to the receiving groove by means of EVA glue.

6. The solar cell assembly according to claim 1, characterized in that: The refractive index of the transition layer (630) is smaller than the refractive index of the first light guide layer (620) and the second light guide layer (640).

7. The solar cell assembly according to claim 1, characterized in that: It also comprises a frame, which is arranged around the glass panel, the first adhesive film layer (200), the battery string (300), the second adhesive film layer (400) and the back plate (500) and is used to fix the various layers.

8. A method for manufacturing a solar cell module, characterized in that: include: Connecting a plurality of battery cells in series and / or in parallel to form a battery string (300); A light guide grid layer (600) is arranged on the back plate (500), wherein the light guide grid layer (600) comprises a first prism layer (610), a first light guide layer (620), a transition layer (630), a second light guide layer (640) and a second prism layer (650) which are arranged in sequence from top to bottom, the surface where the first light guide layer (620) contacts the first prism layer (610) and the surface where the second light guide layer (640) contacts the second prism layer (650) are planes, and the bonding surface between the first light guide layer (620) and the transition layer (630) and the bonding surface between the second light guide layer (640) and the transition layer (630) have concave-convex shapes; The backplane (500), the second adhesive film layer (400), the battery string (300), the first adhesive film layer (200), and the front glass panel (100) are stacked in sequence, wherein the light guide grid layer (600) corresponds to the position of the gap between the battery sheets in the battery string (300); After the stacking is completed, it is laminated to form a solar cell module.

9. The method for manufacturing a solar cell assembly according to claim 8, characterized in that: It also includes opening a receiving groove on the back plate (500) and placing the light guide grid layer (600) in the receiving groove.

10. The method for manufacturing a solar cell module according to claim 9, characterized in that: The depth of the accommodating groove is the sum of the thicknesses of the second light guide layer (640) and the second prism layer (650).

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