Photovoltaic thermal device

Abstract

The present application provides a photovoltaic thermal device. The photovoltaic thermal device comprises an energy storage plate, an insulating connector and a back plate which are stacked in sequence, and the two opposite sides of the insulating connector are respectively connected to the energy storage plate and the back plate; wherein a shunt island is provided on one side of the back plate close to the insulating connector to form a liquid cooling channel between the back plate and the insulating connector, which can improve the structural integration, reduce costs and improve power generation efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic devices, and in particular to a photovoltaic thermal device. Background Art

[0002] The photovoltaic thermal device integrates a liquid cooling system on the back of the photovoltaic module, which can reduce the temperature of the photovoltaic module and collect and use excess heat while improving the efficiency of photovoltaic power generation.

[0003] In the related art, a pre-processed liquid cooling plate is set on the back of the photovoltaic module. There are many forms of liquid cooling plates, the most common ones are blown plates, stamped brazed plates or tube-plate liquid cooling plates. If blown plates and stamped brazed plates are used, the material and process costs are high and the weight is heavy, because this structure usually requires two layers of metal materials, and the processing technology is complicated. For the tube-plate liquid cooling plate structure, the surface temperature uniformity of the photovoltaic module is poor, resulting in low photovoltaic power generation efficiency. Utility Model Content

[0004] The present application provides a photovoltaic thermal device that can improve structural integration, reduce costs and improve power generation efficiency.

[0005] In order to solve the above technical problems, the present application provides a photovoltaic thermal device. The photovoltaic thermal device includes an energy storage plate, an insulating connector and a back plate which are stacked in sequence, and the opposite sides of the insulating connector are respectively connected to the energy storage plate and the back plate; wherein a shunt island is provided on one side of the back plate close to the insulating connector to form a liquid cooling channel between the back plate and the insulating connector.

[0006] In some embodiments, the photovoltaic thermal device further includes: a reinforcement member, which is stacked on a side of the back plate close to the insulating connector and is respectively connected to the back plate and the insulating connector.

[0007] In some embodiments, the reinforcement member and the diverter island do not overlap along a vertical direction of the back plate.

[0008] In some embodiments, the reinforcement member includes: a first reinforcement portion, which is arranged around the peripheral area of ​​the back plate.

[0009] In some embodiments, the reinforcement member includes: a second reinforcement portion disposed in a middle area of ​​the back plate.

[0010] In some embodiments, the photovoltaic thermal device also includes: a first cover plate, which is laminated between the insulating connector and the back plate; an adhesive member, which is laminated between the first cover plate and the back plate, the adhesive member is respectively adhesively connected to the first cover plate and the back plate, and the insulating connector is respectively adhesively connected to the first cover plate and the first cover plate.

[0011] In some embodiments, the diverter island includes a first diverter island, which is arranged around the peripheral area of ​​the back plate close to the insulating connector to form an annular protrusion in the peripheral area; the insulating connector is sealed and connected to the annular protrusion to form the liquid cooling channel between the back plate and the insulating connector.

[0012] In some embodiments, the flow-dividing island further includes a second flow-dividing island located in the annular protrusion to divide the liquid-cooling channel into a plurality of sub-liquid-cooling channels.

[0013] In some embodiments, the photovoltaic thermal device further includes: a second cover plate, which is laminated and arranged on a side of the energy storage plate away from the insulating connector.

[0014] In some embodiments, the insulating connector includes a structural adhesive film layer.

[0015] The beneficial effects of the present application are as follows: the photovoltaic thermal device proposed in the present application includes an energy storage plate, an insulating connector and a back plate which are stacked in sequence, and the opposite sides of the insulating connector are connected to the energy storage plate and the back plate respectively; wherein, a shunt island is provided on the side of the back plate close to the insulating connector. In this way, the back plate with the shunt island can be directly pressed together with the insulating connector to form a liquid cooling flow channel, which has a simple structure and high integration, and does not require the use of complex processes such as blowing and welding. Compared with the existing photovoltaic thermal devices with structures such as blowing plates and stamping brazing plates, the integration of photovoltaic thermal devices can be improved, material costs can be saved, the complexity of the processing technology can be reduced, and costs can be reduced; and compared with the existing photovoltaic thermal devices with tube-plate liquid cooling plate structures, the thermal conductivity is better, the heat is more uniform, and the photovoltaic power generation efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0017] Figure 1 This is a schematic diagram of the exploded structure of the first embodiment of the photovoltaic thermal device of the present application;

[0018] Figure 2 It is a schematic structural diagram of a back plate and a reinforcement member in a second embodiment of a photovoltaic thermal device of the present application;

[0019] Figure 3 It is a schematic structural diagram of a back plate and a reinforcement member in the third embodiment of the photovoltaic thermal device of the present application;

[0020] Figure 4 It is a schematic diagram of the exploded structure of the fourth embodiment of the photovoltaic thermal device of the present application. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. According to the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] The terms "first", "second", etc. in this application are used to distinguish different objects rather than to describe a specific order. In addition, the terms "include", "have", and any variations thereof are intended to cover non-exclusive inclusions.

[0023] It should be noted that when a certain element is fixed to another element, it includes directly fixing the element to the other element, or fixing the element to the other element through at least one other element in the middle. When an element is connected to another element, it includes directly connecting the element to the other element, or connecting the element to the other element through at least one other element in the middle.

[0024] In the related art, a pre-processed liquid cooling plate is set on the back of the photovoltaic module. There are many forms of liquid cooling plates, the most common ones are blown plates, stamped brazed plates or tube-plate liquid cooling plates. If blown plates and stamped brazed plates are used, the material and process costs are high and the weight is heavy, because this structure usually requires two layers of metal materials, and the processing technology is complicated. For the tube-plate liquid cooling plate structure, the surface temperature uniformity of the photovoltaic module is poor, resulting in low photovoltaic power generation efficiency.

[0025] Existing photovoltaic thermal devices have the problems of high cost, heavy weight, complex process, low power generation efficiency, etc. The cost of the liquid cooling system of existing photovoltaic thermal devices accounts for more than 40% of the photovoltaic thermal devices, which increases the initial investment, prolongs the cost recovery cycle, and seriously restricts the development of the photovoltaic thermal industry.

[0026] To this end, the present application proposes a photovoltaic thermal device, such as Figure 1 As shown, Figure 1 Schematic diagram of the exploded structure of the first embodiment of the photovoltaic thermal device of the present application. The photovoltaic thermal device of this embodiment includes: an energy storage plate 10, an insulating connector 20 and a back plate 30 stacked in sequence, and the opposite sides of the insulating connector 20 are connected to the energy storage plate 10 and the back plate 30 respectively; wherein a shunt island 32 is provided on the side of the back plate 30 close to the insulating connector 20 to form a liquid cooling channel 31 between the back plate 30 and the insulating connector 20.

[0027] The insulating connector 20 and the back plate 30 can be directly pressed together to form a sealed liquid cooling channel 31 between the insulating connector 20 and the back plate 30, thereby improving the problem of cooling liquid leakage in the liquid cooling channel 31 and improving the reliability of the photovoltaic thermal device.

[0028] This embodiment can directly press the back plate 30 provided with the diverter island 32 and the insulating connector 20 to form a liquid cooling channel 31. It has a simple structure and high integration, and does not require complex processes such as blowing and welding. Compared with the existing photovoltaic thermal devices with structures such as blowing plates and stamping brazing plates, it can improve the integration of photovoltaic thermal devices, save material costs, reduce the complexity of processing technology, and reduce costs; and compared with the existing photovoltaic thermal devices with tube-plate liquid cooling plate structures, it has better thermal conductivity and more uniform heat, which can improve the photovoltaic power generation efficiency.

[0029] The energy storage panel 10 refers to an element or component that can store and release energy. For example, the energy storage panel 10 of this embodiment may include a solar panel (component) formed by solar cells connected in series and then packaged and protected; the photovoltaic thermal device of this embodiment also includes a controller and an inverter, etc. With the cooperation of the controller and the inverter, the solar panel converts light energy such as sunlight into electrical energy and stores it.

[0030] The insulating connector 20 refers to a component, assembly or film layer having at least electrical insulation, waterproofing and connection functions.

[0031] Optionally, the insulating connector 20 of this embodiment may include a structural adhesive film layer. This embodiment utilizes structural adhesive not only to achieve the connection between the energy storage plate 10 and the back plate 30, but also because the thickness and weight of the structural adhesive film layer are small, it can improve the integration of the photovoltaic thermal device and reduce its weight; further, the structural adhesive has a high connection strength, and it becomes an elastomer after curing, and has good shock resistance, so it can improve the connection stability and shock resistance between the energy storage plate 10 and the back plate 30, and thus can improve the reliability of the photovoltaic thermal device. Furthermore, the structural adhesive has good waterproof performance and can improve the sealing performance of the liquid cooling channel 31.

[0032] For example, the structural adhesive film layer may include an ethylene-vinyl acetate copolymer (EVA) film layer or the like.

[0033] Optionally, the back plate 30 may be a plastic plate, or a metal plate with surface electrical insulation treatment, such as an aluminum alloy plate, or other composite material plates.

[0034] Optionally, the diverter island 32 of the present embodiment includes a first diverter island 321; wherein the first diverter island 321 is arranged around the peripheral area of ​​the back plate 30 close to the insulating connector 20 to form an annular protrusion in the peripheral area; the insulating connector 20 is sealed and connected to the annular protrusion to form a liquid cooling channel 31 between the back plate 30 and the insulating connector 20.

[0035] In the present embodiment, the first diverter island 321 is arranged on the side of the back plate 30 close to the insulating connector 20 to form a accommodating space with an opening, and the insulating connector 20 is sealed to the side of the annular protrusion facing away from the back plate 30, that is, the opening of the accommodating space is blocked, so that the sealed accommodating space serves as the liquid cooling channel 31, which can not only increase the volume of the liquid cooling channel 31, but also improve the sealing performance of the liquid cooling channel 31.

[0036] Optionally, the diverter island 32 of this embodiment further includes a second diverter island 322 located in the annular protrusion to divide the liquid-cooling channel 31 into a plurality of sub-liquid-cooling channels, thereby improving the circulation efficiency of the coolant in the liquid-cooling channel 31 .

[0037] For example, the second flow dividing island 322 divides the liquid-cooling channel 31 into two sub-liquid-cooling channels, and the ends of the two sub-liquid-cooling channels are connected.

[0038] Optionally, the back plate 30 is further provided with an inlet and an outlet, the inlet is used to input the coolant into the liquid cooling channel 31, and the outlet is used to output the coolant in the liquid cooling channel 31 to improve the heat exchange effect; the two sub-liquid cooling channels can be connected with the inlet and outlet respectively.

[0039] Optionally, the second diverter island 322 of the present embodiment may include two first diverter portions that are spaced apart and spirally arranged to form two sub-liquid cooling channels; the two first diverter portions extend from the inlet and outlet to the middle area of ​​the back plate 30 respectively, and can evenly guide the cooling liquid to the entire back plate 30, thereby improving the heat exchange uniformity, thereby improving the heat uniformity, and further improving the power generation efficiency.

[0040] Optionally, the second diverter island 322 of this embodiment may also include a plurality of second diverter portions located in the sub-liquid cooling channel to divide the sub-liquid cooling channel into a plurality of liquid cooling channel branches to further improve the heat exchange uniformity of the coolant and further improve the power generation efficiency.

[0041] Optionally, the inlet and outlet are arranged on the annular protrusion of the back plate 30 to facilitate the entry and exit of the cooling liquid from the side, which can not only reduce the thickness of the back plate 30, but also reduce the impact of the inlet and outlet structures on the laminated photovoltaic thermal device, thereby improving its integration and reliability.

[0042] Of course, in other embodiments, the locations of the inlet and outlet can be adjusted based on the specific structural form and requirements of the photovoltaic thermal device.

[0043] Optionally, the photovoltaic thermal device of this embodiment further includes a first port member 34 and a second port member 35; the first port member 34 is connected to the inlet, and the second port member 35 is connected to the outlet, which can improve the connection convenience, stability and sealing of the inlet, outlet and external liquid supply mechanism.

[0044] In this embodiment, a valve body may be further provided in the first port member 34 and / or the second port member 35 to open and close the inlet and / or the outlet for the transmission of the cooling liquid.

[0045] Optionally, the photovoltaic thermal device of this embodiment further includes a second cover plate 60, which is laminated and arranged on a side of the energy storage plate 10 away from the insulating connector 20. In this embodiment, the second cover plate 60 can protect the energy storage plate 10 and other structures.

[0046] Optionally, the second cover plate 60 may include a glass cover plate or other element, component or film layer that has a protective function and does not attenuate light such as sunlight.

[0047] Optionally, the photovoltaic thermal device of this embodiment further includes an adhesive member 80 , which is laminated between the second cover plate 60 and the energy storage plate 10 , and is adhesively connected to the second cover plate 60 and the energy storage plate 10 , respectively, to achieve connection between the second cover plate 60 and the energy storage plate 10 .

[0048] Optionally, the adhesive member 80 of this embodiment may include a structural adhesive film layer, which can improve the integration of the photovoltaic thermal device and reduce its weight, and can improve the connection stability and anti-seismic performance between the second cover plate 60 and the energy storage plate 10, thereby improving the reliability of the photovoltaic thermal device. Furthermore, the structural adhesive has good waterproof performance and can improve the sealing effect of the energy storage plate 10.

[0049] In this embodiment, the second cover plate 60 and the energy storage plate 10, as well as the energy storage plate 10 and the back plate 30 can be stably connected through the adhesive layer and the adhesive process, which can reduce the weight of the structure, improve the integration, simplify the process, and save costs.

[0050] This embodiment can reduce the cost ratio of the liquid cooling system in the photovoltaic thermal device from more than 40% to less than 15%, while avoiding the processing cost of the liquid cooling system itself, so that the cost recovery period of the entire photovoltaic thermal device is significantly shortened, which can effectively promote the development of the photovoltaic thermal industry.

[0051] The coolant in this embodiment directly cools the energy storage plate 10, which can reduce thermal resistance, improve the overall heat collection effect, and improve power generation efficiency.

[0052] The present application further proposes another embodiment of a photovoltaic thermal device, such as Figure 2 As shown, Figure 2 Schematic diagram of the structure of the back plate and reinforcement member in the second embodiment of the photovoltaic thermal device of the present application. Figure 1 The embodiment further includes a reinforcement member 40 , which is laminated on a side of the back plate 30 close to the insulating connector 20 , and the reinforcement member 40 is connected to the back plate 30 and the insulating connector 20 , respectively.

[0053] Considering that the side of the back plate 30 close to the insulating connector 20 is provided with a shunt island 32, the connection area between the side of the back plate 30 close to the insulating connector 20 and the side of the insulating connector 20 is limited. In order to increase or decrease the connection stability between the back plate 30 and the insulating connector 20, the present embodiment provides a reinforcement member 40 between the two to improve the connection stability between the two. For example, the reinforcement member 40 can be added to the back plate 30 with a patterned back plate, that is, the shunt island 32, so as to increase the connection area between the back plate 30 and the insulating connector 20 through the reinforcement member 40.

[0054] The reinforcement member 40 can be fixedly and sealedly connected to the back plate 30, for example, by welding, integral molding, etc. The reinforcement member 40 can be made of the same material as the back plate 30, or can be made of a different material from the back plate 30. The connection stability between the reinforcement member 40 and the back plate 30 is greater than the connection stability between the back plate 30 and the insulating connector 20.

[0055] Among them, the reinforcement member 40 is arranged parallel to the side of the insulating connector 20 close to the back plate 30 away from the back plate 30, which can increase the connection stability between the reinforcement member 40 and the insulating connector 20, thereby increasing the connection stability between the back plate 30 and the insulating connector 20.

[0056] Optionally, the reinforcement member 40 does not overlap with the diverter island 32 in the vertical direction of the back plate 30. In this way, the reinforcement member 40 does not occupy the space of the flow channel 31 formed by the diverter island 32, and the circulation efficiency of the coolant in the flow channel 31 can be improved, thereby improving the heat collection effect and the power generation efficiency.

[0057] The reinforcement member 40 and the diverter island 32 do not overlap in the vertical direction of the back plate 30, which means that the reinforcement member 40 does not overlap with the back plate 30 in the vertical direction of the back plate 30, that is, in the height direction of the diverter island 32, for example, is arranged in contact with the back plate 30. For example, the reinforcement member 40 is arranged in contact with the end of the diverter island 32 that is away from the back plate 30.

[0058] Optionally, the reinforcement member 40 includes: a first reinforcement portion 41 disposed around the outer peripheral area of ​​the back plate 30 .

[0059] Specifically, the first reinforcement portion 41 may be disposed at the end of the first diverter island 321 away from the back plate 30 to enhance the connection stability and sealing between the outer peripheral area of ​​the back plate 30 and the back plate 30 .

[0060] In another embodiment, if Figure 3 As shown, Figure 3 3 is a schematic diagram of the structure of the back plate and the reinforcement member in the third embodiment of the photovoltaic thermal device of the present application. The reinforcement member 40 of this embodiment further includes: a second reinforcement portion 42 , which is arranged in the middle area of ​​the back plate 30 .

[0061] Specifically, the second reinforcement portion 42 may be disposed at the end of the second diverter island 322 away from the back plate 30 to enhance the connection stability and sealing between the middle area of ​​the back plate 30 and the insulating connector 20 .

[0062] Of course, in other embodiments, the reinforcement portion may be provided only in the middle region of the back plate.

[0063] In other embodiments, the location, quantity, arrangement, etc. of the reinforcement parts on the back plate are not limited.

[0064] In order to increase the connection stability between the back plate 30 and the insulating connector, the present application may add a frame reinforcement structure or a partially reinforced cover plate structure to the back plate 30. The frame reinforcement structure or the partially reinforced cover plate structure and the back plate 30 may be formed in one step or by subsequent processing.

[0065] In another embodiment, if Figure 4 As shown, Figure 4 Schematic diagram of the exploded structure of the fourth embodiment of the photovoltaic thermal device of the present application. Figure 1 On the basis of the embodiment, it further includes: a first cover plate 50 and an adhesive member 70, the first cover plate 50 is stacked between the insulating connector 20 and the back plate 30; the adhesive member 70 is stacked between the first cover plate 50 and the back plate 30, the adhesive member 70 is respectively adhesively connected to the first cover plate 50 and the back plate 30, and the insulating connector 20 is respectively adhesively connected to the first cover plate 50 and the first cover plate 50.

[0066] In this embodiment, the first cover plate 50 can improve the structural strength of the flow channel 31 and enhance its reliability.

[0067] The first cover plate 50 may be a plastic plate, or a metal plate with surface electrical insulation treatment, such as an aluminum alloy plate, or other composite material plates; the adhesive member 70 may include a structural adhesive film layer, which can improve the integration of the photovoltaic thermal device and reduce its weight, and can improve the connection stability and anti-seismic performance between the first cover plate 50 and the back plate 30, thereby improving the reliability of the photovoltaic thermal device. Furthermore, the structural adhesive has good waterproof performance and can improve the sealing effect of the convection channel 31.

[0068] The energy storage plate 10, the first cover plate 50, and the back plate 30 are pressed together at one time by using structural adhesive or other adhesive materials. This process can reduce the complexity of the process and reduce the cost.

[0069] This embodiment achieves stable connection through the adhesive layer and the adhesive process, which can reduce the weight of the structure, improve the integration level, simplify the process, and save costs.

[0070] Similar improvements can be made to the other embodiments above, which will not be described in detail here.

[0071] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A photovoltaic thermal device, characterized in that: The photovoltaic thermal device includes an energy storage plate, an insulating connector and a back plate which are stacked in sequence, and the opposite sides of the insulating connector are respectively connected to the energy storage plate and the back plate; wherein a diverter island is provided on the side of the back plate close to the insulating connector to form a liquid cooling channel between the back plate and the insulating connector.

2. The photovoltaic thermal device according to claim 1, characterized in that: The photovoltaic thermal device also includes: The reinforcing member is laminated on one side of the back plate close to the insulating connecting member and is respectively connected to the back plate and the insulating connecting member.

3. The photovoltaic thermal device according to claim 2, characterized in that: The reinforcement member and the diverter island do not overlap along a vertical direction of the back plate.

4. The photovoltaic thermal device according to claim 2, characterized in that: The reinforcement comprises: The first reinforcement portion is arranged around the outer peripheral area of ​​the back plate.

5. The photovoltaic thermal device according to claim 2 or 4, characterized in that: The reinforcement comprises: The second reinforcement portion is arranged in the middle area of ​​the back plate.

6. The photovoltaic thermal device according to claim 1, characterized in that: The photovoltaic thermal device also includes: A first cover plate, laminated and arranged between the insulating connector and the back plate; The adhesive member is laminated and arranged between the first cover plate and the back plate, the adhesive member is respectively adhesively connected to the first cover plate and the back plate, and the insulating connector is respectively adhesively connected to the first cover plate and the first cover plate.

7. The photovoltaic thermal device according to claim 1, characterized in that: The diverter island comprises a first diverter island, and the first diverter island is arranged around the peripheral area of ​​the back plate near the insulating connector to form an annular protrusion in the peripheral area; The insulating connector is sealingly connected to the annular protrusion to form the liquid cooling channel between the back plate and the insulating connector.

8. The photovoltaic thermal device according to claim 7, characterized in that: The flow-dividing island further includes a second flow-dividing island located in the annular protrusion to divide the liquid-cooling channel into a plurality of sub-liquid-cooling channels.

9. The photovoltaic thermal device according to claim 1, characterized in that: The photovoltaic thermal device also includes: The second cover plate is laminated and arranged on a side of the energy storage plate away from the insulating connector.

10. The photovoltaic thermal device according to claim 1, characterized in that: The insulating connector includes a structural adhesive film layer.

Images