A concentrating glass, a concentrating solar cell module and a method of manufacture

Abstract

The application discloses a light-gathering glass, a light-gathering solar cell module and a preparation method. The light-gathering glass comprises a glass substrate, a light-gathering mechanism arranged inside the glass substrate, and the light-gathering mechanism comprises a first light refraction mechanism, a second light refraction mechanism and a light reflection mechanism arranged from top to bottom, wherein the first light refraction mechanism and the second light refraction mechanism each comprise a plurality of linear light-gathering gratings arranged symmetrically and made according to the Fresnel lens principle, the optical focal points of the first light refraction mechanism and the second light refraction mechanism coincide, and the size ratio of the second light refraction mechanism to the first light refraction mechanism is less than 1. The light-gathering structure inside the light-gathering glass can reflect and concentrate the incident light on the non-cell piece light-receiving surface to the cell piece, thereby helping to improve the unit area power generation of the solar cell module.

Description

Technical Field

[0001] This invention relates to a concentrating glass, a concentrating solar cell module, and a method for its preparation. Background Technology

[0002] With the continuous development of clean energy, solar photovoltaic modules have also seen significant growth. Improving the photoelectric conversion efficiency of these modules is a core issue for the current development of the photovoltaic industry. Common methods to improve module photoelectric conversion efficiency include: increasing the photoelectric conversion efficiency of the solar cells, reducing the area of ​​non-cell-filled regions within the module, and increasing the total solar irradiance of the module.

[0003] To improve the photoelectric conversion efficiency of solar cells by increasing the total light irradiance of the module, the industry has developed a concentrated solar cell module, which adds a concentrating device to the solar cell module. However, this method has problems such as complex structure, high manufacturing cost, and severe heat generation of materials due to the high concentration of light, which leads to shortened module life and reduced reliability. Summary of the Invention

[0004] In view of this, the technical problem to be solved by the present invention is to provide a concentrating glass, a concentrating solar cell module, and a preparation method thereof. The concentrating glass, including a concentrating structure, is provided on the solar cell module so that not only the incident light on the light-receiving surface of the cell can be absorbed, but also the incident light on the non-light-receiving surface of the cell can be absorbed by the cell after a series of refractions and reflections of the incident light by the concentrating structure. Moreover, due to the simple manufacturing of the structure, the power generation per unit area of ​​the solar cell module is significantly improved while effectively controlling the cost of the solar cell module.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] In a first aspect, the present invention provides a light-concentrating glass, the light-concentrating glass comprising:

[0007] Glass substrate;

[0008] A light-concentrating mechanism disposed inside a glass substrate; the light-concentrating mechanism includes a first light refraction mechanism, a second light refraction mechanism, and a light reflection mechanism arranged from top to bottom, wherein the first light refraction mechanism and the second light refraction mechanism each include multiple linear light-concentrating gratings arranged symmetrically and made according to the Fresnel lens principle, the optical focal points of the first light refraction mechanism and the second light refraction mechanism coincide, and the size ratio of the second light refraction mechanism to the first light refraction mechanism is less than 1.

[0009] Furthermore, the extension direction of the focusing grating is consistent with the length or width direction of the glass substrate.

[0010] Furthermore, the refractive index of the focusing grating is greater than that of the glass substrate.

[0011] Furthermore, there are multiple focusing mechanisms.

[0012] In a second aspect, the present invention provides a concentrating solar cell module, comprising:

[0013] A solar cell string consists of multiple solar cells;

[0014] Material for the back cover plate on the back surface of the solar cell string;

[0015] A cover glass plate disposed on the light-receiving surface of the solar cell string, the cover glass being the light-concentrating glass mentioned in the first aspect above, wherein the light-concentrating mechanism of the light-concentrating glass is located directly above the non-cell light-receiving surface of the solar cell string; and

[0016] A front encapsulating film positioned between the solar cell string and the concentrator glass, and a back encapsulating film positioned between the solar cell string and the back cover material.

[0017] Furthermore, the solar cell string includes a first solar cell and a second solar cell; wherein the first solar cell is located at both ends of the solar cell string, the second solar cell is located in the middle of the solar cell string, and the width of the first solar cell is smaller than the width of the second solar cell.

[0018] Furthermore, there are multiple solar cell strings arranged side by side, which are connected in parallel by busbars.

[0019] Thirdly, the present invention provides a method for preparing a focusing glass, comprising:

[0020] Step S11: Prepare glass substrate material;

[0021] Step S12: Place a first light refraction mechanism, a second light refraction mechanism, and a light reflection mechanism arranged from top to bottom in the glass substrate material to obtain a light-concentrating glass; wherein, the first light refraction mechanism and the second light refraction mechanism each include multiple linear light-concentrating gratings arranged symmetrically and having arc-shaped surfaces, the optical focal points of the first light refraction mechanism and the second light refraction mechanism coincide, and the size ratio of the second light refraction mechanism to the first light refraction mechanism is less than 1.

[0022] Fourthly, the present invention provides a method for preparing a concentrated solar cell module, comprising:

[0023] Step S21: Place the focusing glass;

[0024] Step S22: Sequentially lay the front sealing film, solar cell string, back sealing film, and back cover material on the concentrating glass.

[0025] Furthermore,

[0026] If there are multiple solar cell strings, they are connected in parallel through busbars.

[0027] The technical solution of the first aspect of the above invention has the following advantages or beneficial effects: The solution provided by the embodiments of the present invention has the following advantages or beneficial effects: Since the optical focal points of the first light refraction mechanism and the second light refraction mechanism in the light-concentrating mechanism disposed inside the glass substrate coincide, and the size ratio of the second light refraction mechanism to the first light refraction mechanism is less than 1, it can concentrate the incident light on the non-solar cell light-receiving surface, and then reflect the concentrated light onto the solar cell for absorption through the light reflection mechanism. The structure is simple to manufacture, and while effectively controlling the cost of solar cell modules, it significantly improves the power generation per unit area of ​​solar cell modules. Attached Figure Description

[0028] Figure 1 This is a cross-sectional schematic diagram of a light-concentrating glass according to an embodiment of the present invention;

[0029] Figure 2 This is a cross-sectional schematic diagram of the light-concentrating structure inside the light-concentrating glass according to an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram illustrating the principle of the light propagation path of incident light in a light-concentrating structure in one embodiment of the present invention;

[0031] Figure 4 This is a cross-sectional schematic diagram of the arrangement of multiple cell strings in a concentrating solar cell module according to an embodiment of the present invention;

[0032] Figure 5 This is a cross-sectional schematic diagram of the arrangement of multiple battery strings in a concentrated solar cell module according to another embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of multiple solar cells in a solar cell string according to an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the connection of multiple battery cells in a battery string in one embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram of the light density on the solar cells after the solar cell string receives light along the length of the module in one embodiment of the present invention.

[0036] Figure 9 This is a schematic diagram of the light density on the entire solar cell string after it receives light along the width direction of the module in one embodiment of the present invention.

[0037] Figure 10This is a schematic diagram of the light density on the entire solar cell string after it receives light along the length of the module in one embodiment of the present invention.

[0038] Figure 11 This is a schematic diagram of the light density on the entire solar cell string after it is simultaneously irradiated with light along the length and width directions of the component in one embodiment of the present invention.

[0039] Figure 12 This is a schematic diagram of the main process of a method for preparing a focusing glass according to an embodiment of the present invention;

[0040] Figure 13 This is a schematic diagram of the main process of a method for preparing a concentrated solar cell module according to an embodiment of the present invention.

[0041] The attached figures are labeled as follows:

[0042] 1---Concentrating glass; 2---Glass substrate; 3---Concentrating mechanism; 31---First light refraction mechanism;

[0043] 31---Second light refraction mechanism; 33---Light reflection mechanism;

[0044] 4---Solar cell string; 41---First solar cell; 42---Second solar cell;

[0045] 4a---Solar cell strings located in the middle of the solar cell module; 4b---Solar cell strings located at the edge of the solar cell module;

[0046] 5a---Incident light along the length of the solar cell module; 5b---Incident light along the width of the solar cell module;

[0047] 6a---Light density formed by the direct absorption of incident light and indirect absorption of reflected light from the 5a direction by the solar cell; 6b---Light density formed by the direct incident light by the solar cell;

[0048] 7a---Light density formed by the direct absorption of incident light and indirect absorption of reflected light from the direction 5b by the solar cell; 7b---Light density formed by the direct absorption of incident light by the solar cell. Detailed Implementation

[0049] In the following description and the appended claims, the light refraction mechanism utilizes the Fresnel lens principle to create a linear structure on a photovoltaic glass substrate to alter the light propagation path. A Fresnel lens, also known as a threaded lens, is typically a thin sheet injection-pressed from polyolefin material, though glass can also be used. One side of the lens surface is smooth, while the other side is etched with concentric circles of increasing size. Its texture is designed based on light interference and perturbation, as well as relative sensitivity and receiving angle requirements, resulting in very high lens specifications. Its working principle is quite simple: a continuous portion of the lens surface "collapses" onto a plane. In cross-section, its surface consists of a series of serrated grooves, with an elliptical arc at the center. Each groove has a different angle from its adjacent grooves, but all converge the light at a single point, forming the central focal point, which is the lens's focal point. Each groove can be considered an independent microlens, adjusting the light into parallel or focused light.

[0050] One existing method involves adding a concentrating device directly to the outside of the solar cell module to focus as much ambient light as possible onto the module. However, this method results in a complex and costly concentrated photovoltaic (CPV) system composed of numerous devices, making it impractical. Another method involves attaching an arc-shaped concentrating grating, made using the Fresnel lens principle, to the cover material of the solar cell module's light-receiving surface. The aim is to convert the uniformly irradiated light before it enters the concentrating material into focused incident light. While this increases the power output of the cells at the focal point, cells in other areas cannot receive light and cannot perform photoelectric conversion. Therefore, this type of CPV module does not actually increase the power output per unit area. Furthermore, the highly focused light easily leads to material heating, posing significant safety hazards such as fires, accelerated material aging, and shortened lifespan.

[0051] To address the issue of low light conversion efficiency in existing solar cell modules, this invention provides a concentrating glass for solar cell modules. This concentrating glass incorporates a concentrating mechanism, comprising a first light refraction mechanism, a second light refraction mechanism, and a light reflection mechanism arranged from top to bottom. Both the first and second light refraction mechanisms include multiple linear concentrating gratings symmetrically arranged and fabricated according to the Fresnel lens principle. The optical focal points of the first and second light refraction mechanisms coincide, and the size ratio of the second to the first light refraction mechanism is less than 1. Therefore, the first and second light refraction mechanisms can concentrate incident light from non-solar cell light-receiving surfaces, and the concentrated light is then reflected back to the solar cells for absorption by the light reflection mechanism. This simple structure achieves a significant increase in power generation per unit area of ​​the solar cell module while effectively controlling its cost.

[0052] Specifically, in order to solve the above problems and achieve the above effects, embodiments of the present invention provide a light-concentrating glass. Figure 1 A schematic cross-sectional view of the focusing glass is shown; Figure 2 A cross-sectional schematic diagram of the light-concentrating structure inside the light-concentrating glass is shown; Figure 3 A schematic diagram illustrating the principle of light propagation path in a focusing structure is shown. (For example...) Figure 1 , Figure 2 As shown, the focusing glass 1 mainly includes:

[0053] Glass substrate 2;

[0054] A light-concentrating mechanism 3 is disposed inside the glass substrate 2. The light-concentrating mechanism 3 includes a first light refraction mechanism 31, a second light refraction mechanism 32, and a light reflection mechanism 33 arranged from top to bottom. The first light refraction mechanism 31 and the second light refraction mechanism 32 each include multiple linear light-concentrating gratings arranged symmetrically and made according to the Fresnel lens principle. The optical focal points of the first light refraction mechanism 31 and the second light refraction mechanism 32 coincide. The size ratio of the second light refraction mechanism 32 to the first light refraction mechanism 31 is less than 1.

[0055] For incident light on the area directly above the non-cell light-receiving surface, after illuminating the focusing mechanism, the multiple linear focusing gratings in the first light refraction mechanism 31 are made according to the Fresnel lens principle, so that the optical focus of the multiple linear focusing gratings can be focused at one point. Furthermore, since the optical focus of the first light refraction mechanism 31 and the second light refraction mechanism 32 in the focusing mechanism set inside the glass substrate coincides, and the size ratio of the second light refraction mechanism 32 to the first light refraction mechanism 31 is less than 1, the incident light on the non-cell light-receiving surface can be focused. Then, the focused light is reflected onto the cell 4 for absorption by the light reflection mechanism 33. The structure is simple to manufacture, and while effectively controlling the cost of the solar cell module, it significantly improves the power generation per unit area of ​​the solar cell module.

[0056] Specifically, such as Figure 3 As shown, parallel incident light rays, after being refracted by the first light refraction mechanism 31, converge at the optical focal point of the first light refraction mechanism 31. By placing the focusing gratings of the first light refraction mechanism 31 and the second light refraction mechanism 32 in opposite directions, the optical focal point of the second light refraction mechanism 32 coincides with the optical focal point of the first light refraction mechanism 31. Therefore, the light rays converging at the optical focal point of the first light refraction mechanism 31 enter the second light refraction mechanism 32. Simultaneously, since the size ratio of the second light refraction mechanism 32 to the first light refraction mechanism 31 is less than 1 (i.e., the second light refraction mechanism 32 is manufactured according to a scaled-down version of the first light refraction mechanism), the light rays, after being refracted by the second light refraction mechanism 32, become parallel again, but the beam is more concentrated. The outgoing light refracted by the second light refraction mechanism 32 is finally reflected by the light reflection mechanism 33, and the light rays illuminate the solar cells on the battery string 4 at a specific reflection angle. Thus, the incident light rays from the non-cell-filling area of ​​the solar cell module, after passing through the focusing mechanism 3 and changing their propagation path, are then illuminated onto the solar cells. This improves the light utilization rate per unit area of ​​the solar cell module and increases the power generation capacity of the solar cell module.

[0057] Furthermore, the extension direction of the focusing grating is consistent with the length or width direction of the glass substrate; there are multiple focusing mechanisms.

[0058] The number of concentrating mechanisms can be adjusted according to the number of solar cells installed in the solar cell module to further improve the light utilization rate per unit area of ​​the solar cell module.

[0059] Furthermore, the refractive index of the focusing grating is greater than that of the glass substrate.

[0060] Since the concentrating glass used in solar cell modules is generally thin, in order for the light refraction and reflection mechanisms in the concentrating mechanism to change the light propagation path so that incident light from the area directly above the non-solid cell light-receiving surface can also be refracted and reflected to reach the light-receiving surface of the solar cell, it is necessary to ensure that the refractive index of the concentrating grating is greater than that of the glass substrate.

[0061] Specifically, in order to solve the above problems and achieve the above effects, another embodiment of the present invention provides a concentrating solar cell module. Figure 4 This is a cross-sectional schematic diagram of the arrangement of multiple cell strings in a concentrating solar cell module according to an embodiment of the present invention; Figure 5 This is a cross-sectional schematic diagram of the arrangement of multiple battery strings in a concentrated solar cell module according to another embodiment of the present invention;

[0062] Figure 6 A schematic diagram of multiple solar cells in a solar cell string according to one embodiment is shown; Figure 7 This diagram illustrates the connection of multiple battery cells in a battery string. Figure 4-7 As shown, the concentrating solar cell module provided in this embodiment of the invention includes:

[0063] Solar cell string 4, composed of multiple solar cells;

[0064] Material for the back cover plate on the back side of solar cell string 4;

[0065] A cover glass plate is disposed on the light-receiving surface of the solar cell string 4. The cover glass plate is the aforementioned concentrating glass 1, and the concentrating mechanism 3 of the concentrating glass 1 is located directly above the non-cell light-receiving surface of the solar cell string 4; and

[0066] The front encapsulation film is positioned between the solar cell string 4 and the concentrator glass 1, and the back encapsulation film is positioned between the solar cell string 4 and the back cover material. For a single-glass solar cell module, a polymer backsheet can be used as the back cover material; for a double-glass solar cell module, the backsheet glass is used as the back cover material.

[0067] like Figure 4 As shown, incident light directly above the light-receiving surface of the solar cell can be directly absorbed by the solar cell. However, incident light in areas not directly above the light-receiving surface of the solar cell needs to be refracted, focused, and reflected by a focusing mechanism on the focusing glass 1 located in the area directly above the non-light-receiving surface of the solar cell string 4. The incident light is then reflected onto the solar cell for absorption, thereby achieving the light utilization rate per unit area of ​​the solar cell module.

[0068] Furthermore, the solar cell string 4 includes a first solar cell 41 and a second solar cell 42; wherein the first solar cell 41 is located at both ends of the solar cell string 4, the second solar cell 42 is located in the middle of the solar cell string 4, and the width of the first solar cell 41 is smaller than the width of the second solar cell 42.

[0069] For incident light along the length of the solar cell module, after being processed by the concentrator, it is focused onto the cells at both ends of the solar cell string. Therefore, the light density received by the cells 41 at the beginning and end of the solar cell string is higher than that of the cells 42 located in the middle of the solar cell string. To ensure consistent current across multiple cells in the same solar cell string, the width of the cells 41 at the beginning and end of the solar cell string is smaller than the width of the cells 42 located in the middle of the solar cell string. Specifically, from... Figure 6 As can be seen, in the same solar cell string, the width of the cells 41 located at the beginning and end is smaller than the width of the cells 42 located in the middle of the solar cell string. Furthermore, from... Figure 7 As can be seen, the narrower solar cells at both ends and the wider solar cells in the middle form a solar cell string.

[0070] Specifically, Figure 8 This is a schematic diagram showing the light density on the solar cells after the solar cell string receives light along the length of the module, according to one embodiment of the present invention; as shown. Figure 8 As shown, the incident light along the length of the solar cell module is concentrated and illuminated by the concentrating mechanism onto the cells at both ends of the solar cell string after being processed by the concentrating mechanism. Therefore, the light density received by the cells 41 at both ends of the solar cell string is higher than that of the cells 42 located in the middle of the solar cell string.

[0071] Furthermore, there are multiple solar cell strings 4 arranged side by side, which are connected in parallel by busbars.

[0072] like Figure 4 , Figure 9 As shown, in one embodiment of the present invention, a concentrating solar cell module has 10 cell strings arranged side by side. In the case of multiple solar cell strings, when multiple solar cells are placed side by side, the incident light along the width of the solar cell module is concentrated and irradiated on the solar cell strings at the edge of the solar cell module after being processed by the concentrating mechanism. This makes the photocurrent on the solar cell strings at the edge higher than that on the solar cell strings in the middle of the solar cell module. In order to solve the problem of inconsistent current between different solar cell strings, multiple solar cell strings arranged side by side are connected in parallel.

[0073] Figure 5 This diagram shows a cross-sectional view of the arrangement of multiple cell strings in a concentrating solar cell module according to another embodiment of the present invention. Figure 5 As can be seen, each of the two rows of solar cell strings contains multiple solar cell strings arranged side by side. The first row has six solar cell strings arranged side by side, and these six solar cell strings are connected in parallel. The second row also has six solar cell strings arranged side by side, and these six solar cell strings are connected in parallel. Then, the solar cell strings connected in parallel in the first row and the solar cell strings connected in parallel in the second row are connected in series.

[0074] Figure 9 This is a schematic diagram showing the light density across the entire solar cell string after it receives light along the width direction of the module, according to one embodiment of the present invention; as shown. Figure 9 As shown, incident light along the width of the solar cell module, after being processed by the concentrator, is focused onto the solar cell strings at the edge of the solar cell module. The photocurrent on these edge solar cell strings is higher than that on the solar cell strings in the middle of the solar cell module.

[0075] Furthermore, Figure 10 This is a schematic diagram of the light density on the entire solar cell string after it receives light along the length of the module in one embodiment of the present invention. Figure 11 This is a schematic diagram showing the light density on the entire solar cell string after it has been simultaneously illuminated along both the length and width directions of the module, according to one embodiment of the present invention. Figure 10 , 11 As shown, in a solar cell module composed of multiple solar cell strings, the solar cell strings located at the edge of the module receive a higher light density than those located in the middle. Therefore, multiple solar cell strings arranged side-by-side are connected in parallel. However, for each individual solar cell string, the light density on the cells at the beginning and end of the string is higher than that on the cells in the middle. Therefore, the width of the cells at the beginning and end of the string is set smaller than the width of the cells in the middle to ensure that the current of each cell in the same string is consistent.

[0076] Figure 12 This is a schematic diagram of the main process of a method for preparing a focusing glass according to an embodiment of the present invention; as shown below. Figure 12 As shown, another embodiment of the present invention provides a method for preparing a focusing glass, comprising:

[0077] Step S11: Prepare glass substrate material;

[0078] Step S12: Place a first light refraction mechanism 31, a second light refraction mechanism 32, and a light reflection mechanism 33 arranged from top to bottom in the glass substrate material to obtain a focusing glass 1; wherein, the first light refraction mechanism 31 and the second light refraction mechanism 32 each include multiple linear focusing gratings arranged symmetrically and having arc-shaped surfaces, the optical focal points of the first light refraction mechanism 31 and the second light refraction mechanism 32 coincide, and the size ratio of the second light refraction mechanism 32 to the first light refraction mechanism 31 is less than 1.

[0079] Specifically, to solve the aforementioned problems and achieve the aforementioned effects, it is only necessary to fabricate a focusing mechanism inside the focusing glass. This focusing mechanism includes a first light refraction mechanism 31 and a second light refraction mechanism 32, which are symmetrically arranged and fabricated according to the Fresnel lens principle. The optical focal points of the first light refraction mechanism 31 and the second light refraction mechanism 32 coincide, and the size ratio of the second light refraction mechanism 32 to the first light refraction mechanism 31 is less than 1.

[0080] Therefore, in preparing the aforementioned focusing glass, a hollow structure corresponding to the shape of the focusing grating can be directly etched onto the existing focusing glass substrate, and then filled with a transparent material with a refractive index higher than that of the glass substrate material to obtain the first light refraction mechanism. Correspondingly, a second light refraction mechanism and a light reflection mechanism can also be prepared by etching technology.

[0081] The concentrating glass for solar cell modules provided in this invention features a concentrating mechanism within the glass. This mechanism comprises a first light refraction mechanism, a second light refraction mechanism, and a light reflection mechanism arranged from top to bottom. Both the first and second light refraction mechanisms include multiple linear concentrating gratings arranged symmetrically and fabricated according to the Fresnel lens principle. The optical focal points of the first and second light refraction mechanisms coincide, and the size ratio of the second to the first light refraction mechanism is less than 1. Therefore, the first and second light refraction mechanisms can be used to concentrate incident light from non-solar cell light-receiving surfaces. The concentrated light is then reflected back onto the solar cells for absorption via the light reflection mechanism. The structure is simple to manufacture, achieving a significant increase in the power generation per unit area of ​​the solar cell module while effectively controlling its cost.

[0082] Figure 13 This is a schematic diagram of the main process of a method for preparing a concentrated solar cell module according to an embodiment of the present invention, as shown below. Figure 13 As shown, the method for preparing a concentrated solar cell module provided in this embodiment of the invention mainly includes:

[0083] Step S21, place the focusing glass 1;

[0084] Step S22: Sequentially lay the front encapsulation film, the solar cell string 4, the back encapsulation film, and the back cover material on the concentrating glass 1.

[0085] By using the concentrating glass with a concentrating mechanism inside, the solar cell module provided in this embodiment of the invention can not only absorb and utilize the incident light in the area directly above the light-receiving surface of the solar cell, but also aggregate and absorb incident light on the solar cell through the concentrating mechanism, thereby improving the light utilization rate per unit area of ​​the solar cell module and increasing the power generation of the solar cell module.

[0086] Furthermore, if there are multiple solar cell strings 4, the multiple solar cell strings 4 arranged side by side are connected in parallel through busbars.

[0087] In cases with multiple solar cell strings, the incident light along the width of the solar cell module is concentrated onto the solar cell strings at the edges of the module after being processed by a concentrator. The photocurrent on these edge strings is higher than that on the strings in the middle of the module. To address the issue of inconsistent current between different solar cell strings, they are connected in parallel.

[0088] The solar cell module provided in this invention features a concentrating mechanism within a concentrating glass. This concentrating mechanism includes a first light refraction mechanism, a second light refraction mechanism, and a light reflection mechanism arranged from top to bottom. Both the first and second light refraction mechanisms include multiple linear concentrating gratings arranged symmetrically and fabricated according to the Fresnel lens principle. The optical focal points of the first and second light refraction mechanisms coincide, and the size ratio of the second to the first light refraction mechanism is less than 1. Therefore, the first and second light refraction mechanisms can be used to concentrate incident light from non-solar cell light-receiving surfaces. The concentrated light is then reflected back onto the solar cells for absorption via the light reflection mechanism. This simple structure achieves a significant increase in power generation per unit area of ​​the solar cell module while effectively controlling its cost.

Claims

1. A light-concentrating glass, characterized in that, The focusing glass (1) comprises: Glass substrate (2); A light-concentrating mechanism (3) is disposed inside the glass substrate (2); the light-concentrating mechanism (3) includes a first light refraction mechanism (31), a second light refraction mechanism (32) and a light reflection mechanism (33) arranged from top to bottom, wherein the first light refraction mechanism (31) and the second light refraction mechanism (32) each include multiple linear light-concentrating gratings arranged symmetrically and made according to the Fresnel lens principle. The optical focal points of the first light refraction mechanism (31) and the second light refraction mechanism (32) coincide, and the size ratio of the second light refraction mechanism (32) to the first light refraction mechanism (31) is less than 1. The focusing glass (1) is used in solar cell modules; The light-concentrating mechanism (3) is located directly above the non-cell light-receiving surface of the solar cell string (4) of the solar cell module.

2. The concentrating glass according to claim 1, characterized in that, The extension direction of the focusing grating is consistent with the length or width direction of the glass substrate (2).

3. The focusing glass according to claim 1, characterized in that, The refractive index of the focusing grating is greater than that of the glass substrate (2).

4. The concentrating glass according to claim 1, characterized in that, The number of the light-concentrating mechanism (3) is multiple.

5. A concentrating solar cell module, characterized in that, include: A solar cell string (4) is composed of multiple solar cells; Material of the back cover plate disposed on the back surface of the solar cell string (4); A cover glass plate disposed on the light-receiving surface of the solar cell string (4), the cover glass plate being the light-concentrating glass (1) as described in claims 1-4, wherein the light-concentrating mechanism (3) of the light-concentrating glass (1) is located directly above the non-cell light-receiving surface of the solar cell string (4); and The front encapsulation film disposed between the solar cell string (4) and the concentrating glass (1), and the back encapsulation film disposed between the solar cell string (4) and the back cover material.

6. The concentrating solar cell module according to claim 5, characterized in that, The solar cell string (4) includes a first solar cell (41) and a second solar cell (42); wherein the first solar cell (41) is located at the beginning and end of the solar cell string (4), the second solar cell (42) is located in the middle of the solar cell string (4), and the width of the first solar cell (41) is smaller than the width of the second solar cell (42).

7. The concentrating solar cell module according to claim 5, characterized in that, There are multiple solar cell strings (4), and the multiple solar cell strings (4) arranged side by side are connected in parallel through busbars.

8. A method for preparing a focusing glass according to any one of claims 1 to 4, characterized in that, include: Step S11: Prepare glass substrate material; Step S12: Place a first light refraction mechanism (31), a second light refraction mechanism (32), and a light reflection mechanism (33) arranged from top to bottom in the glass substrate material to obtain a light-concentrating glass (1); wherein, the first light refraction mechanism (31) and the second light refraction mechanism (32) each include multiple linear light-concentrating gratings arranged symmetrically and having arc-shaped surfaces, the optical focal points of the first light refraction mechanism (31) and the second light refraction mechanism (32) coincide, and the size ratio of the second light refraction mechanism (32) to the first light refraction mechanism (31) is less than 1.

9. A method for preparing a concentrated solar cell module according to any one of claims 5 to 7, characterized in that, include: Step S21, place the focusing glass (1); Step S22: The front encapsulation film, solar cell string (4), back encapsulation film and back cover material are sequentially laid on the focusing glass (1).

10. The method for preparing a concentrated solar cell module according to claim 9, characterized in that, If there are multiple solar cell strings (4), the multiple solar cell strings (4) arranged side by side are connected in parallel by busbars.

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