A self-cooling photovoltaic module

Abstract

The utility model relates to photovoltaic technology field, concretely relates to a self heat dissipation photovoltaic module. Include: first encapsulation cover board, second encapsulation cover board, cell piece layer and heat conduction structure, it is vacuum space between first encapsulation cover board and second encapsulation cover board, and cell piece layer and heat conduction structure set up in vacuum space, heat conduction structure includes a plurality of heat conduction pipes, a plurality of heat conduction pipes interval setting between cell piece layer and first encapsulation cover board, and / or a plurality of heat conduction pipes interval setting between cell piece layer and second encapsulation cover board, and heat conduction pipe has the heat conduction cavity with external environment intercommunication, and the heat conduction cavity is suitable for heat conduction gas and external cold air circulation. Heat conduction pipe can take away the heat in vacuum space, prolongs the life of photovoltaic module, improves the luminous power of photovoltaic module.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, specifically to a self-heating photovoltaic module. Background Technology

[0002] Currently, the most common photovoltaic (PV) modules on the market are double-glass PV modules, which are composite layers consisting of two glass panes and solar cells. The solar cells are connected in series and parallel to the lead terminals to form the PV module. A common encapsulation technology for double-glass PV modules involves using polymer films such as EVA / POE / EPE, which are then laminated and heated under vacuum to complete the encapsulation. While the encapsulation film improves the adhesion between the two glass panes and the solar cells, its presence can affect the PV module's airtightness and block sunlight, thus impacting its conversion efficiency.

[0003] Therefore, with the continuous development of photovoltaic technology, the technology of eliminating the encapsulant film and directly creating a vacuum within the double-layered glass has emerged. However, the application of vacuum glass in photovoltaic module encapsulation also presents many problems, the most important of which is that the interlayer of the double-layered glass is in a vacuum state, resulting in very poor thermal conductivity, while the solar cells are encapsulated within this interlayer. In practical use, heat accumulates in the interlayer of the vacuum glass due to its poor thermal conductivity. Simultaneously, the solar cells generate significant heat during power generation, further increasing the temperature of the interlayer. Since the power generation efficiency of solar cells is negatively correlated with temperature, this leads to a substantial reduction in power generation efficiency. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is that in a vacuum-sealed photovoltaic module, the solar cell is located in the middle vacuum layer of the photovoltaic module, which has poor thermal conductivity and heat accumulation can easily reduce power generation efficiency. Thus, a self-heating photovoltaic module is provided.

[0005] To address the aforementioned problems, this utility model provides a self-heating photovoltaic module, comprising: a first encapsulation cover plate, a second encapsulation cover plate, and a cell layer, wherein a vacuum space exists between the first and second encapsulation cover plates, and the cell layer is disposed within the vacuum space, and further comprising:

[0006] A heat-conducting structure is disposed within the vacuum space. The heat-conducting structure includes a plurality of heat-conducting pipes, which are spaced apart between the battery cell layer and the first encapsulation cover plate; and / or the plurality of heat-conducting pipes are spaced apart between the battery cell layer and the second encapsulation cover plate. Each heat-conducting pipe has a heat-conducting cavity communicating with the external environment, and the heat-conducting cavity is suitable for the circulation of heat-conducting gas and external cold air.

[0007] Optionally, in the above-mentioned self-heating photovoltaic module, the heat pipe is a reflective heat pipe, and the reflective heat pipe is adapted to reflect sunlight reaching the surface of the reflective heat pipe facing the solar cell layer to the solar cell layer.

[0008] Optionally, in the above-mentioned self-heating photovoltaic module, the reflective material of the reflective heat pipe is titanium dioxide or aluminum powder.

[0009] Optionally, in the above-mentioned self-heating photovoltaic module, several of the heat pipes are arranged in parallel to each other.

[0010] Optionally, in the above-mentioned self-heating photovoltaic module, both ends of the heat pipe extend into the external environment, and the heat conduction cavity of the heat pipe is suitable for circulating heat-conducting gas to remove the heat in the vacuum space.

[0011] Optionally, the above-mentioned self-heating photovoltaic module further includes: a support structure disposed on the surface of the first encapsulation cover plate near the cell layer, and / or disposed on the surface of the second encapsulation cover plate near the cell layer, the support structure being adapted to abut against the cell layer.

[0012] Optionally, in the above-mentioned self-heating photovoltaic module, the support structure includes a plurality of support blocks arranged in an array, the heat pipe is disposed between two adjacent support blocks, and the height of the heat pipe in the thickness direction of the photovoltaic module is lower than the height of the support block in that direction.

[0013] Optionally, in the above-mentioned self-heating photovoltaic module, the support block is made of a transparent material.

[0014] Optionally, the above-mentioned self-heating photovoltaic module further includes: an air extraction hole formed on the first encapsulation cover plate and / or the second encapsulation cover plate, the air extraction hole being adapted to connect a vacuum space with the external environment;

[0015] A first sealing element is disposed around the outer periphery of the first encapsulation cover plate and the second encapsulation cover plate. The first sealing element is suitable for sealing a vacuum space and fixing a heat-conducting structure.

[0016] A second seal is adapted to be disposed at the air extraction port.

[0017] Optionally, in the above-mentioned self-heating photovoltaic module, both the first seal and the second seal are liquid butyl rubber.

[0018] This utility model has the following advantages:

[0019] 1. The self-heating photovoltaic module provided by this utility model includes a first encapsulation cover plate, a second encapsulation cover plate, a cell layer, and a heat-conducting structure. A vacuum space is formed between the first encapsulation cover plate and the second encapsulation cover plate, and the cell layer and the heat-conducting structure are disposed in the vacuum space. When sunlight irradiates the photovoltaic module, the air in the heat-conducting pipe expands due to heat and is discharged into the external environment, carrying away the heat accumulated in the vacuum space. External cold air enters the heat-conducting cavity, realizing the circulation of hot and cold air in the heat-conducting cavity. The photovoltaic module achieves self-heating, extends the life of the photovoltaic module, and improves the power generation efficiency.

[0020] 2. The self-heating photovoltaic module provided by this utility model has a reflective heat pipe with reflective function, which can reflect the sunlight shining on the reflective heat pipe onto the battery cell, thereby enhancing the utilization rate of sunlight and further improving the luminous power of the photovoltaic module.

[0021] 3. In the self-heating photovoltaic module provided by this utility model, the height of the heat pipe in the thickness direction of the photovoltaic module is lower than the height of the support block in that direction, ensuring that there is an expansion space between the heat pipe and the battery cell layer, and avoiding damage to the battery cell layer when the heat pipe expands due to heat. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a side view of a self-heating photovoltaic module provided in an embodiment of the present invention;

[0024] Figure 2 This is a top view of a self-heating photovoltaic module provided in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of a self-heating photovoltaic module provided in an embodiment of the present invention;

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. First encapsulation cover plate; 2. Second encapsulation cover plate; 3. Battery cell layer; 4. Vacuum space; 5. Heat pipe; 6. Support block; 7. Vacuum vent; 8. First seal; 9. Second seal. Detailed Implementation

[0028] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] Example 1

[0033] Combination Figures 1 to 3 This embodiment provides a self-heating photovoltaic module, including:

[0034] The system comprises a first encapsulation cover 1, a second encapsulation cover 2, a battery cell layer 3, and a heat-conducting structure. A vacuum space 4 exists between the first encapsulation cover 1 and the second encapsulation cover 2, and the battery cell layer 3 is disposed within the vacuum space 4. The heat-conducting structure includes several heat-conducting pipes 5, which are spaced apart between the battery cell layer 3 and the first encapsulation cover 1. Alternatively, several heat-conducting pipes 5 may be spaced apart between the battery cell layer 3 and the second encapsulation cover 2. Each heat-conducting pipe 5 has a heat-conducting cavity that communicates with the external environment, and the heat-conducting cavity is suitable for the circulation of heat-conducting gas and external cold air.

[0035] Specifically, in this embodiment, both the first encapsulation cover 1 and the second encapsulation cover 2 are made of glass. The heat-conducting pipe 5 is a flexible tube with open ends formed by hot extrusion. The heat-conducting structure is disposed between the battery cell layer 3 and the second encapsulation cover 2. Of course, the heat-conducting structure can also be disposed between the battery cell layer 3 and the first encapsulation cover 1, or two layers of heat-conducting structure can be disposed, one between the first encapsulation cover 1 and the battery cell layer 3, and the other between the second encapsulation cover 2 and the battery cell layer 3. A vacuum space 4 is formed by evacuating the space between the first encapsulation cover 1 and the second encapsulation cover 2. The heat-conducting structure is disposed in the vacuum space 4, and several heat-conducting pipes 5 are evenly arranged in the vacuum space 4, with both ends connected to the external environment.

[0036] When sunlight irradiates the photovoltaic module, heat accumulates in the vacuum space 4. The air in the heat pipe 5 expands after being heated and is then discharged into the external environment, carrying away a large amount of heat. As the hot air in the heat-conducting cavity decreases, cold air from the outside enters the heat-conducting cavity, realizing the circulation of hot and cold air in the heat-conducting cavity. The photovoltaic module achieves self-heating and extends the life of the photovoltaic module.

[0037] In the aforementioned self-heating photovoltaic module, the heat pipe 5 is a reflective heat pipe, and the reflective heat pipe is adapted to reflect sunlight reaching the surface of the reflective heat pipe facing the cell layer 3 back to the cell layer 3. The heat pipe has a reflective function, which can reflect sunlight shining on the reflective heat pipe back to the cell of the cell layer 3, thereby enhancing the utilization rate of sunlight and improving the luminous power of the photovoltaic module.

[0038] The aforementioned self-heating photovoltaic module uses a reflective heat-conducting pipe made of a combination of a resin matrix, reflective material, and functional additives. After thoroughly mixing the resin matrix, reflective material, and functional additives, the mixture is heated to 250°C to melt and then extruded and shaped to form the reflective heat-conducting pipe. The resin matrix can be made of polymer materials such as PET, PVC, EVA, and POE, which are simple materials with good light transmittance. The reflective material gives the heat-conducting pipe 5 excellent reflectivity, allowing for better utilization of sunlight. The functional additives improve the weather resistance of the heat-conducting pipe 5, extending its service life and thus increasing the lifespan of the photovoltaic module.

[0039] Specifically, the reflective material is titanium dioxide or aluminum powder, which, when incorporated into the resin matrix, effectively reflects sunlight and also has a certain cooling effect. Titanium dioxide is heat-resistant and has self-cleaning properties; adding aluminum powder of appropriate content and particle size to the resin matrix enables the heat pipe 5 to have good solar heat reflection performance, and aluminum powder is inexpensive, resulting in high economic benefits.

[0040] Furthermore, the aforementioned functional additive is a UV absorber, which is uniformly distributed on the heat pipe 5. The UV absorber is suitable for absorbing UV rays reaching the heat pipe 5. This UV absorber gives the heat pipe 5 excellent weather resistance, preventing pulverization during long-term use, making it more suitable for photovoltaic module applications.

[0041] Furthermore, in this embodiment, the functional additives are preferably a combination of antioxidants, light stabilizers, and ultraviolet absorbers. Antioxidants can effectively inhibit or reduce the rate of thermal oxidation of resin macromolecules, prolong the thermal degradation process of the resin, significantly improve heat resistance, and thus extend the service life of the heat pipe 5. In this embodiment, antioxidant 1010 is used. The light stabilizer in this embodiment refers to hindered amine light stabilizers within a relatively narrow sense, used to capture free radicals for decomposition, effectively protecting the polymer and avoiding problems such as yellowing, reduced gloss, and weakened physical properties, thereby enhancing weather resistance. Compared to the aforementioned light stabilizers, ultraviolet absorbers utilize the principle of physical protection to absorb projected light. Since the heat pipe 5 has a certain thickness, a combination of light stabilizers and ultraviolet absorbers, along with antioxidants, is used to protect the resin matrix from weathering and aging.

[0042] In this embodiment, as Figure 2 and Figure 3 As shown, several heat pipes 5 are arranged in parallel, with both ends of the heat pipes 5 extending into the external environment. The heat conduction cavity of the heat pipes 5 is suitable for the flow of heat-conducting gas to remove heat from the vacuum space 4. Photovoltaic modules are usually installed at an angle or vertically, and the heat-conducting gas is air. When the two ends of the heat pipes 5 extend into the external environment, the air in the heat conduction cavity of the heat pipes 5 expands after being heated and is discharged from the top of the photovoltaic module, carrying away a large amount of heat. As the air in the heat conduction cavity decreases, cold air enters the heat conduction cavity from below the photovoltaic module. As the temperature rises, the cold air becomes hot air and is discharged from the top of the photovoltaic module. After being discharged, it encounters cooling in the atmosphere, undergoes heat exchange, and becomes cold air again, subsequently sinking. This achieves a dynamic equilibrium of the gas, realizing the self-heating function of the photovoltaic module.

[0043] Furthermore, the aforementioned self-heating photovoltaic module also includes a support structure disposed on the surface of the first encapsulation cover 1 near the cell layer 3 and on the surface of the second encapsulation cover 2 near the cell layer 3. The support structure is adapted to abut against the cell layer 3. Of course, the support structure may be disposed only on the first encapsulation cover 1 or only on the second encapsulation cover 2.

[0044] The support structure can be made of polymer materials such as EVA / POE, or other transparent materials. The flexible and transparent material helps to protect the battery cell layer 3 while facilitating the absorption of more light energy by the battery cell layer 3, and also facilitates the formation of a vacuum space 4 between the first encapsulation cover plate 1 and the second encapsulation cover plate 2.

[0045] Specifically, the aforementioned support structure includes several arrayed support blocks 6, with heat pipes 5 positioned between two adjacent support blocks 6. The height of the heat pipes 5 in the thickness direction of the photovoltaic module is lower than the height of the support blocks 6 in that direction, ensuring that there is an expansion space between the heat pipes 5 and the cell layer 3, thus preventing the heat pipes 5 from damaging the cell layer 3 when heated and expanding.

[0046] like Figure 1 As shown, the self-heating photovoltaic module of this embodiment further includes: an extraction hole 7, a first sealing member 8, and a second sealing member 9. The extraction hole 7 is formed on the first encapsulation cover plate 1 or the second encapsulation cover plate 2. The extraction hole 7 is suitable for connecting the vacuum space 4 with the external environment. Of course, the extraction hole 7 can also be provided on the first encapsulation cover plate 1 and the second encapsulation cover plate 2 at the same time. The first sealing member 8 is arranged around the outer periphery of the first encapsulation cover plate 1 and the second encapsulation cover plate 2. The first sealing member 8 is suitable for sealing the vacuum space 4 and fixing the heat-conducting structure. The second sealing member 9 is suitable for being disposed at the extraction hole 7.

[0047] A vacuum hole 7 is provided on the first encapsulation cover 1 or the second encapsulation cover 2 to draw air outward, thereby forming a vacuum space 4 between the first encapsulation cover 1 and the second encapsulation cover 2; a first sealing element 8 is coated on the outer periphery of the first encapsulation cover 1 and the second encapsulation cover 2 to fix the first encapsulation cover 1 and the second encapsulation cover 2 while sealing the vacuum space 4, and to achieve the bonding and fixation of the heat-conducting structure; the vacuum hole 7 is sealed with a second sealing element 9 after the air is drawn out.

[0048] Specifically, in this embodiment, both the first sealing element 8 and the second sealing element 9 are liquid butyl rubber. After the first encapsulation cover plate 1, the second encapsulation cover plate 2, the battery cell layer 3, and the thermal conductive structure are stacked and installed, lamination is then performed. Typically, air is drawn out from the evacuation hole 7 while heating is being carried out. As the temperature rises, the butyl rubber, which serves as the first sealing element 8, melts, completing the sealing of the first encapsulation cover plate 1 and the second encapsulation cover plate 2 around the perimeter and the bonding and fixing of the thermal conductive structure. After sealing, air is drawn out for a period of time to achieve a vacuum state. Finally, the air is drawn out and the evacuation hole 7 is sealed with butyl rubber to complete the encapsulation.

[0049] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A self-heating photovoltaic module, comprising: A first encapsulation cover plate (1), a second encapsulation cover plate (2), and a battery cell layer (3) are provided, wherein a vacuum space (4) is formed between the first encapsulation cover plate (1) and the second encapsulation cover plate (2), and the battery cell layer (3) is disposed within the vacuum space (4). The product is characterized by further comprising: A heat-conducting structure is disposed within the vacuum space (4). The heat-conducting structure includes a plurality of heat-conducting pipes (5), which are spaced apart between the battery cell layer (3) and the first encapsulation cover plate (1); and / or the plurality of heat-conducting pipes (5) are spaced apart between the battery cell layer (3) and the second encapsulation cover plate (2). Each heat-conducting pipe (5) has a heat-conducting cavity communicating with the external environment, and the heat-conducting cavity is suitable for the circulation of heat-conducting gas and external cold air.

2. The self-heating photovoltaic module according to claim 1, characterized in that, The heat pipe (5) is a reflective heat pipe, and the reflective heat pipe is adapted to reflect sunlight reaching the surface of the reflective heat pipe facing the side of the battery cell layer (3) back to the battery cell layer (3).

3. The self-heating photovoltaic module according to claim 2, characterized in that, The reflective material of the reflective heat pipe is titanium dioxide or aluminum powder.

4. The self-heating photovoltaic module according to any one of claims 1-3, characterized in that, Several heat pipes (5) are arranged in parallel to each other.

5. The self-heating photovoltaic module according to any one of claims 1-3, characterized in that, Both ends of the heat pipe (5) extend into the external environment, and the heat conduction cavity of the heat pipe (5) is suitable for the flow of heat conduction gas to remove the heat in the vacuum space (4).

6. The self-heating photovoltaic module according to any one of claims 1-3, characterized in that, It also includes: a support structure disposed on the surface of the first encapsulation cover (1) near the battery cell layer (3), and / or disposed on the surface of the second encapsulation cover (2) near the battery cell layer (3), the support structure being adapted to abut against the battery cell layer (3).

7. The self-heating photovoltaic module according to claim 6, characterized in that, The support structure includes several arrayed support blocks (6), and the heat pipe (5) is disposed between two adjacent support blocks (6), and the height of the heat pipe (5) in the thickness direction of the photovoltaic module is lower than the height of the support block (6) in that direction.

8. The self-heating photovoltaic module according to claim 7, characterized in that, The support block (6) is made of transparent material.

9. The self-heating photovoltaic module according to any one of claims 1-3, characterized in that, Also includes: A vent (7) is formed on the first encapsulation cover plate (1) and / or the second encapsulation cover plate (2), and the vent (7) is adapted to connect the vacuum space (4) with the external environment; A first sealing element (8) is disposed around the outer periphery of the first encapsulation cover plate (1) and the second encapsulation cover plate (2). The first sealing element (8) is adapted to seal the vacuum space (4) and fix the heat-conducting structure. A second seal (9) is adapted to be disposed at the air extraction port (7).

10. The self-heating photovoltaic module according to claim 9, characterized in that, Both the first seal (8) and the second seal (9) are liquid butyl rubber.

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