Photovoltaic module capable of automatically melting snow

Abstract

The utility model discloses a self-snow-melting photovoltaic module, and relates to the technical field of photovoltaic modules, the self-snow-melting photovoltaic module comprises a photovoltaic module main body, a plurality of battery strings are arranged in the photovoltaic module main body, a resistance wire is laid in a gap between the plurality of battery strings, and two ends of the resistance wire are electrically connected with a positive electrode and a negative electrode of the photovoltaic module main body respectively. The utility model provides the self-snow-melting photovoltaic assembly, the self-snow-melting function of the photovoltaic assembly is realized, and the power generation loss under the condition of accumulated snow is reduced, so that the benefit of a power station is improved, and the safety and the reliability of the photovoltaic support in use under the condition of accumulated snow can be improved; the external environment of the photovoltaic module main body is monitored through the accumulated snow monitoring module, when accumulated snow is monitored on the surface of the photovoltaic module main body, the accumulated snow monitoring module closes a circuit, and at the moment, the battery string supplies power to the resistance wire, so that the resistance wire is promoted to generate heat and the accumulated snow is quickly melted.

Description

Technical Field

[0001] This application relates to the technical field of photovoltaic modules, and particularly to a self - snow - melting photovoltaic module. Background Art

[0002] In the natural environment, photovoltaic modules often face the situation of snow accumulation. Especially when the ambient temperature is relatively low, it is very difficult for the snow to melt in a short time after accumulation. The accumulated snow blocks the sunlight, resulting in the inability of the photovoltaic module to work properly, reducing the power generation efficiency, and the power generation of the photovoltaic power station will drop significantly, affecting the economic benefits of the power station. Moreover, as the old snow does not melt and new snow continues to accumulate, the pressure borne by the photovoltaic support accumulates continuously, which may cause deformation, even damage and collapse of the photovoltaic support, posing a threat to the safe operation of the photovoltaic power station.

[0003] Currently, the methods for clearing snow on photovoltaic modules mainly rely on manual snow removal with equipment or using chemical reagents. The former has relatively low efficiency and potential safety hazards. The latter uses chemical reagents (such as snow - melting agents), which will cause certain damage to the environment. At the same time, these chemical substances will also corrode the photovoltaic modules and supports, affecting their service life and safety. Summary of the Invention

[0004] In order to solve the above problems existing in the prior art, this application provides a self - snow - melting photovoltaic module.

[0005] This application provides a self - snow - melting photovoltaic module, adopting the following technical solutions:

[0006] A self - snow - melting photovoltaic module includes a photovoltaic module main body. Inside the photovoltaic module main body, several battery strings are arranged. Resistance wires are laid at the gaps between the several battery strings. The two ends of the resistance wires are respectively electrically connected to the positive and negative poles of the photovoltaic module main body. A snow accumulation monitoring module is arranged between the resistance wires and the photovoltaic module main body. A junction box and a power storage module are arranged at the bottom of the photovoltaic module main body. The junction box is connected to the battery strings through a bus bar. The input end of the power storage module is electrically connected to the output end of the photovoltaic module main body through the junction box. The output end of the power storage module is electrically connected to the input end of the resistance wire.

[0007] Through the above technical solutions, when the photovoltaic module main body generates electricity, the current generated by the battery strings is collected through the bus bar, and then part of the current is sent to the inside of the power storage module through the junction box, thereby storing electricity in the power storage module and supplying power to the resistance wire through the junction box. The external environment of the photovoltaic module main body is monitored by the snow accumulation monitoring module. When it is detected that there is snow accumulation on the surface of the photovoltaic module main body, the snow accumulation monitoring module closes the circuit. At this time, the battery strings supply power to the resistance wire, so as to make the resistance wire generate heat and quickly melt the snow.

[0008] Optionally, in the above-mentioned self-snow-melting photovoltaic module, at least two paths of resistance wires are laid at the gaps between the battery strings. Each path of resistance wire is connected in parallel and a snow accumulation monitoring module is arranged between the resistance wire and the main body of the photovoltaic module.

[0009] Through the above technical solution, by setting multiple paths of resistance wires, the temperature can be increased faster, and the snow accumulation on the photovoltaic module can be melted faster. Moreover, when one or several paths of resistance wires fail, the other paths of resistance wires can still continue to work, ensuring the continuity and stability of the snow melting process.

[0010] Optionally, in the above-mentioned self-snow-melting photovoltaic module, the snow accumulation monitoring module controls the resistance wire by setting a circuit switch.

[0011] Optionally, in the above-mentioned self-snow-melting photovoltaic module, the snow accumulation monitoring module includes a temperature sensor and a pressure sensor.

[0012] Optionally, in the above-mentioned self-snow-melting photovoltaic module, the signal output end of the temperature sensor is electrically connected to the signal input end of the circuit switch through a controller, and the signal output end of the pressure sensor is electrically connected to the signal input end of the circuit switch through a controller. The monitoring threshold of the temperature sensor is determined according to factors such as region and climate. For example, the setting range is -5°C to 5°C. The monitoring threshold of the pressure sensor is determined according to factors such as region, climate, and snow accumulation thickness. For example, the setting range is 10 Pa to 30 Pa.

[0013] Through the above technical solution, the external temperature is monitored by the temperature sensor. When the external temperature is not higher than the set value, the temperature sensor transmits the signal to the controller, and then the control block controls the circuit switch to close; when the external temperature is higher than the set value, the temperature sensor transmits the signal to the controller, and then the control block controls the circuit switch to open, so that the resistance wire stops working.

[0014] Through the above technical solution, the pressure above the photovoltaic module is monitored by the pressure sensor. When the pressure value is not lower than the set value, the pressure sensor transmits the signal to the controller, and then the control block controls the circuit switch to close; when the pressure value is lower than the set value, the pressure sensor transmits the signal to the controller, and then the control block controls the circuit switch to open, so that the resistance wire stops working.

[0015] Optionally, in the above-mentioned self-snow-melting photovoltaic module, the snow accumulation monitoring module further includes a humidity sensor.

[0016] Optionally, in the above-mentioned self-snow-melting photovoltaic module, the signal output end of the humidity sensor is electrically connected to the signal input end of the circuit switch through a controller. The monitoring threshold of the humidity sensor is determined according to factors such as region, climate, and snow accumulation thickness, for example, the setting range is 30% - 65%.

[0017] Through the above technical solution, the external humidity is monitored by the humidity sensor. When the air humidity is not lower than the set value, the humidity sensor transmits the signal to the controller, and then the control block controls the circuit switch to close. When the air humidity is lower than the set value, the humidity sensor transmits the signal to the controller, and then the control block controls the circuit switch to open, so that the resistance wire stops working.

[0018] Optionally, in the above-mentioned self-snow-melting photovoltaic module, the photovoltaic module body includes an upper tempered glass and a lower tempered glass, and the battery string and the resistance wire are encapsulated through the upper tempered glass and the lower tempered glass.

[0019] Optionally, in the above-mentioned self-snow-melting photovoltaic module, the upper tempered glass and the lower tempered glass are connected by a sealant.

[0020] Through the above technical solution, it is convenient to encapsulate the battery string and the resistance wire through the cooperation of the upper tempered glass and the lower tempered glass, and it is convenient to increase the sealing performance when the upper tempered glass and the lower tempered glass are connected by the sealant.

[0021] Optionally, in the above-mentioned self-snow-melting photovoltaic module, a frame is movably sleeved outside the photovoltaic module body, and the upper tempered glass and the lower tempered glass are connected through the frame.

[0022] Through the above technical solution, the upper tempered glass and the lower tempered glass are fixed together through the frame.

[0023] In summary, the present application includes at least one of the following beneficial effects:

[0024] The present utility model provides a self-snow-melting photovoltaic module, which realizes the self-snow-melting function of the photovoltaic module, reduces the power generation loss of the power station under snow accumulation conditions, thereby improving the power station efficiency, and can improve the safety and reliability of the photovoltaic support when used under snow accumulation conditions;

[0025] The snow accumulation on the photovoltaic module body is monitored by the snow accumulation monitoring module. When snow accumulation on the photovoltaic module body is detected, the resistance wire is started to melt the snow. When no snow accumulation on the photovoltaic module body is detected, the resistance wire stops operating, thereby reducing power waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a top view of the present application;

[0027] Figure 2 is a three-dimensional structure schematic diagram of the top surface of this application;

[0028] Figure 3 is a three-dimensional structure schematic diagram of the bottom surface of this application;

[0029] Figure 4 is a circuit connection schematic diagram of this application;

[0030] Figure 5 is a circuit connection schematic diagram of the snow accumulation monitoring module in Embodiment 1 of this application;

[0031] Figure 6 is a circuit connection schematic diagram of the snow accumulation monitoring module in Embodiment 2 of this application.

[0032] In the figure: 1, photovoltaic module main body; 11, upper tempered glass; 12, lower tempered glass; 2, battery string; 3, resistance wire; 4, snow accumulation monitoring module; 5, frame; 6, junction box; 7, power storage module; 8, bus bar. Specific embodiments

[0033] The following combines the attached Figures 1-6 to further elaborate on this application in detail.

[0034] Embodiment 1, please refer to the accompanying drawings in the specification Figures 1-5 , an embodiment provided by this application: a self - melting snow photovoltaic module, including a photovoltaic module main body 1, several battery strings 2 are arranged in the photovoltaic module main body 1, resistance wires 3 are laid at the gaps between several battery strings 2, and both ends of the resistance wires 3 are electrically connected to the positive and negative poles of the photovoltaic module main body 1 respectively. The photovoltaic module main body 1 includes an upper tempered glass 11 and a lower tempered glass 12. The cooperation of the upper tempered glass 11 and the lower tempered glass 12 facilitates the encapsulation of the battery strings 2 and the resistance wires 3, thereby protecting the battery strings 2 and the resistance wires 3.

[0035] The upper tempered glass 11 and the lower tempered glass 12 are connected by a sealant, and the sealant facilitates increasing the sealing performance when the upper tempered glass 11 and the lower tempered glass 12 are connected.

[0036] A snow accumulation monitoring module 4 is arranged between the resistance wire 3 and the photovoltaic module main body 1. The external environment is monitored through the snow accumulation monitoring module 4. When snow accumulation on the photovoltaic module main body is detected, the snow accumulation monitoring module 4 closes the circuit. At this time, the battery string 2 supplies power to the resistance wire 3, and thus heat is generated by the resistance wire 3 to melt the snow accumulation.

[0037] An outer movable sleeve of the photovoltaic module main body 1 is provided with a frame 5. The upper toughened glass 11 and the lower toughened glass 12 are connected by the frame 5. The upper toughened glass 11 and the lower toughened glass 12 are fixed together by the frame 5, and the frame 5 facilitates the protection of the edges of the upper toughened glass 11 and the lower toughened glass 12.

[0038] A junction box 6 and a power storage module 7 are arranged at the bottom of the photovoltaic module main body 1. The junction box 6 is connected to the battery string 2 by arranging a bus bar 8. The input end of the power storage module 7 is electrically connected to the output end of the photovoltaic module main body 1 through the junction box 6. The output end of the power storage module 7 is electrically connected to the input end of the resistance wire 3. When the photovoltaic module main body 1 generates electricity, the current generated by the battery string 2 is collected through the bus bar 8, and then part of the current is transmitted into the power storage module 7 through the junction box 6, so as to store electricity in the power storage module 7. When it is night, the power storage module 7 supplies power to the resistance wire 3, so as to enable the resistance wire 3 to continue to maintain the self-melting snow function of the photovoltaic module main body 1 at night.

[0039] A snow accumulation monitoring module 4 is arranged between the power storage module 7 and the resistance wire 3. The circuit between the power storage module 7 and the resistance wire 3 is controlled through the snow accumulation monitoring module 4, so that at night, the start and stop of the resistance wire 3 can be controlled according to the snow accumulation situation.

[0040] The snow accumulation monitoring module 4 is used to control the resistance wire by setting a circuit switch. The snow accumulation monitoring module 4 includes a temperature sensor and a pressure sensor. The signal output ends of the temperature sensor and the pressure sensor are electrically connected to the signal input end of the circuit switch through a controller. The monitoring threshold of the temperature sensor is 0 °C, and the monitoring threshold of the pressure sensor is 10 Pa.

[0041] The external temperature is monitored through the temperature sensor. When the external temperature is not higher than 0 °C, the temperature sensor transmits the signal into the controller, and then the control block controls the circuit switch to close. When the external temperature is higher than 0 °C, the temperature sensor transmits the signal into the controller, and then the control block controls the circuit switch to open, so that the resistance wire 3 stops working.

[0042] The pressure above the photovoltaic module is monitored through the pressure sensor. When the pressure value is not lower than 10 Pa, the pressure sensor transmits the signal into the controller, and then the control block controls the circuit switch to close. When the pressure value is lower than 10 Pa, the pressure sensor transmits the signal into the controller, and then the control block controls the circuit switch to open, so that the resistance wire 3 stops working.

[0043] When the external temperature is not higher than 0°C and the pressure above the photovoltaic module is not lower than 10 Pa, the temperature sensor and the pressure sensor transmit signals to the controller, and the control block controls the closing of the circuit switch. At this time, the battery string 2 supplies power to the heating wire 3, so that heat is generated by the heating wire 3 to melt the snow accumulation.

[0044] Embodiment 2, refer to Figures 1-4 and Figure 6 , which is the second embodiment of the present invention. The difference between this embodiment and Embodiment 1 is that the snow accumulation monitoring module 4 further includes a humidity sensor. The signal output end of the humidity sensor is electrically connected to the signal input end of the circuit switch through the controller. The monitoring threshold of the humidity sensor is set according to the humidity condition of the area where the module is installed and where it snows all year round.

[0045] The external humidity is monitored by the humidity sensor. When the air humidity is not lower than the set value, the humidity sensor transmits a signal to the controller, and then the control block controls the closing of the circuit switch. When the air humidity is lower than the set value, the humidity sensor transmits a signal to the controller, and then the control block controls the opening of the circuit switch, so that the heating wire stops working.

[0046] When the external temperature is not higher than 0°C, the pressure above the photovoltaic module is not lower than 10 Pa, and when the air humidity is not lower than the monitoring threshold of the humidity sensor, the temperature sensor, the pressure sensor, and the humidity sensor transmit signals to the controller, and the control block controls the closing of the circuit switch. At this time, the battery string 2 supplies power to the heating wire 3, so that heat is generated by the heating wire 3 to melt the snow accumulation.

[0047] Working principle: When the self - snow - melting photovoltaic module operates, the current generated by the battery string 2 is unidirectionally conducted through the bypass diode, and the current generated by the battery string 2 is divided into three paths. One path directly generates electricity, one path charges the energy storage module 7, and another path supplies power to one of the heating wires 3. When the battery string 2 does not generate electricity, the energy storage module 7 supplies power to the heating wire 3, and the start and stop of the heating wire 3 are controlled by the snow accumulation monitoring module 4.

[0048] The conditions for snow accumulation on the surface of the photovoltaic module main body 1 are low temperature, usually below 0°C, high humidity such as 60%, and there will be a certain pressure after the ice and snow accumulate on the surface of the module. Usually, the snow with a thickness of each centimeter will generate a pressure of 10 Pa - 30 Pa. The temperature, humidity, and pressure values on the surface of the photovoltaic module main body 1 are monitored by the snow accumulation monitoring module 4.

[0049] When the external temperature is not higher than 0°C, the humidity is not lower than 60%, and the pressure value is not lower than 10 Pa, the snow accumulation monitoring module 4 automatically closes; when the external temperature is higher than 0°C, the humidity is lower than 60%, or the pressure value is lower than 10 Pa, at this time, the snow accumulation monitoring module 4 disconnects the circuit, so as to stop supplying power to the heating wire 3.

[0050] When the battery string 2 generates electricity, part of the current is delivered into the resistance wire 3, thereby prompting the resistance wire 3 to generate heat and prompting the snow on the surface of the main body 1 of the photovoltaic module to melt quickly. When the battery string 2 does not generate electricity, the resistance wire 3 is powered by the power storage module 7.

[0051] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A self - melting - snow photovoltaic module, comprising a photovoltaic module body (1), characterized in that: A plurality of battery strings (2) are arranged in the photovoltaic module body (1), and resistance wires (3) are laid in the gaps between the plurality of battery strings (2), and the two ends of the resistance wire (3) are respectively electrically connected to the positive and negative poles of the photovoltaic module body (1), and a snow monitoring module (4) is arranged between the resistance wire (3) and the photovoltaic module body (1). A junction box (6) and a power storage module (7) are arranged at the bottom of the photovoltaic module body (1), and the junction box (6) is connected to the battery string (2) by arranging a bus bar (8), and the input end of the power storage module (7) is electrically connected to the output end of the photovoltaic module body (1) through the junction box (6), and the output end of the power storage module (7) is electrically connected to the input end of the resistance wire (3).

2. The self - melting - snow photovoltaic module according to claim 1, wherein: At least two resistance wires (3) are laid in the gaps between the battery strings (2), and each resistance wire (3) is connected in parallel and a snow monitoring module (4) is provided between the resistance wires (3) and the photovoltaic assembly body (1).

3. The self - melting - snow photovoltaic module according to claim 1, characterized in that: The snow accumulation monitoring module (4) is used to control the resistance wire (3) by providing a circuit switch.

4. The self - melting - snow photovoltaic module according to claim 3, wherein: The snow monitoring module (4) comprises a temperature sensor and a pressure sensor.

5. The self - melting - snow photovoltaic module according to claim 4, wherein: The signal output end of the temperature sensor is electrically connected to the signal input end of the circuit switch through a controller, and the signal output end of the pressure sensor is electrically connected to the signal input end of the circuit switch through a controller.

6. The self - melting - snow photovoltaic module according to claim 4, wherein: The snow monitoring module (4) also includes a humidity sensor.

7. The self - melting - snow photovoltaic module according to claim 6, wherein: The signal output end of the humidity sensor is electrically connected to the signal input end of the circuit switch through a controller.

8. The self - melting - snow photovoltaic module according to claim 1, wherein: The photovoltaic module body (1) comprises an upper layer of tempered glass (11) and a lower layer of tempered glass (12), and the battery string (2) and the resistance wire (3) are encapsulated by the upper layer of tempered glass (11) and the lower layer of tempered glass (12).

9. The self - melting - snow photovoltaic module according to claim 8, wherein: The upper layer of tempered glass (11) and the lower layer of tempered glass (12) are connected by means of a sealant.

10. The self - melting - snow photovoltaic module according to claim 8, wherein: The outer movable sleeve of the photovoltaic module body (1) is provided with a frame (5), and the upper layer of tempered glass (11) and the lower layer of tempered glass (12) are connected via the frame (5).

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