A safe energy storage multifunctional photovoltaic device

Abstract

The present invention provides a safe energy storage multifunctional photovoltaic device, comprising: a light guide water trough fixedly mounted on a base with an inclined angle; the light guide water trough comprising a conductively connected horizontal portion and an inclined portion and filled with a first medium; a bifacial photovoltaic assembly disposed on the inclined portion of the light guide water trough for converting solar energy into electrical energy; a support assembly disposed at the bottom of the inclined portion of the light guide water trough, capable of adjusting the angle of the light guide water trough; and an energy storage battery compartment fixedly mounted on the bottom of the horizontal portion of the light guide water trough and electrically connected to the bifacial photovoltaic assembly for storing the electrical energy generated by the bifacial photovoltaic assembly. The present invention utilizes the light guide water trough to significantly increase photovoltaic power generation output and photovoltaic conversion efficiency, while achieving simultaneous photovoltaic and thermal energy generation and low-cost, high-reliability photovoltaic single-axis tracking. Furthermore, the present invention has the advantages of convenient self-cleaning, effectively extending the life of the photovoltaic cells, and achieving a zero-fire-hazard energy storage battery configuration.

Description

Technical Field

[0001] The present invention relates to photovoltaic power generation equipment, and in particular to a safe energy storage multifunctional photovoltaic device. Background Art

[0002] Photovoltaic power generation, a renewable, pollution-free energy source, has seen rapid growth in recent years. my country, under pressure from resource constraints and environmental concerns, is also actively developing this technology. However, alongside this rapid growth, negative factors have also emerged, weakening corporate investment in photovoltaic power plants. These issues primarily include low power output per unit area and low efficiency.

[0003] Photovoltaic panels are limited by their conversion efficiency. For example, the current laboratory efficiency limit for monocrystalline panels is only around 28%. This means that to achieve sufficient output, photovoltaic power plants must occupy a significant area. A 10MW photovoltaic power plant requires a staggering amount of land. Given the current land shortage and high land prices, the investment in land for photovoltaic power generation is enormous. Furthermore, the production of solar panels is highly polluting and energy-intensive. Under current conditions, it is estimated that the production of a 1m×1.5m solar panel requires the burning of over 40 kilograms of coal. The carbon emissions from these production processes require the operation of the photovoltaic panels for six months to a year to offset. Furthermore, considering the high carbon emissions generated by inverter and power grid construction and manufacturing, it can be said that the current 2-3 years of photovoltaic power generation only offsets the carbon emissions during the construction process, without any energy conservation and emission reduction benefits, thus compromising both environmental and economic benefits. Under current conditions, increasing the power output of photovoltaic power plants while integrating solar thermal energy to heat water and improve the photovoltaic efficiency per unit area will be key to improving the economic and social benefits of photovoltaic power generation.

[0004] In addition, photovoltaic power generation fluctuates greatly and has a great impact on the power grid. Energy storage equipment must be configured to maximize the benefits of photovoltaic power generation. However, existing energy storage batteries have great safety hazards and are prone to fire and explosion. Once a fire occurs in a centralized installation, the consequences will be extremely serious. The fire safety hazards of photovoltaic power generation must be resolved. Summary of the Invention

[0005] The present invention utilizes double-sided photovoltaic modules, and through the comprehensive use of light and heat, as well as increased light intensity of photovoltaic panels, it can effectively compensate for the reduction in power generation output caused by the reduction in direct sunlight energy, while reducing the gradual temperature rise, further improving the power generation output during the peak period of electricity consumption in summer, and also utilizing circulating hot water resources for isolation and fire extinguishing in the event of a fire, greatly improving the benefits, efficiency and safety of photovoltaic power generation.

[0006] To achieve the above-mentioned objectives, the present invention provides a safe energy storage type multifunctional photovoltaic device, which comprises: a light guide water trough, which is fixedly arranged on a base with an inclined angle; the light guide water trough includes a horizontal part and an inclined part that are conductively connected, and the interiors of the horizontal part and the inclined part are both filled with a first medium; a double-sided photovoltaic assembly, which is arranged on the inclined part of the light guide water trough and is used to convert solar energy into electrical energy; a support assembly, which is arranged at the bottom of the inclined part of the light guide water trough and can adjust the inclination angle of the inclined part of the light guide water trough; an energy storage battery compartment, which is fixedly arranged at the bottom of the horizontal part of the light guide water trough and is electrically connected to the double-sided photovoltaic assembly to store the electrical energy generated by the double-sided photovoltaic assembly; wherein the horizontal part reflects sunlight to the double-sided photovoltaic assembly, which can increase the electrical energy conversion efficiency of the photovoltaic device.

[0007] Preferably, the horizontal portion and the inclined portion of the light-guiding water trough are both transparent, and the cross-section of the light-guiding water trough is a broken-line plate, hollow inside and sealed on all sides; wherein, because the light-guiding water trough is transparent and filled with the first medium, the backlight surface of the double-sided photovoltaic module can convert electrical energy.

[0008] Preferably, the inclined portion of the light-guiding water trough matches the size of the double-sided photovoltaic module.

[0009] Preferably, a water inlet is provided at one end of the horizontal portion of the light-guiding water trough for injecting the first medium; and a water outlet is provided at the top of the inclined portion of the light-guiding water trough for discharging the first medium.

[0010] Preferably, a pressure nozzle is provided at the top of the inclined portion of the light-guiding water trough, which is connected to the light-guiding water trough and faces the double-sided photovoltaic module, and the first medium can be used to clean the front of the double-sided photovoltaic module.

[0011] Preferably, the support assembly includes a fixed bracket and a hydraulic piston; the fixed bracket is fixedly arranged on one side of the bottom of the inclined part of the light-guiding water trough near the top; the hydraulic piston is arranged on one side of the bottom of the inclined part of the light-guiding water trough near the horizontal part, and is connected to the light-guiding water trough; by changing the pressure of the first medium in the light-guiding water trough, the deformation of the hydraulic piston is controlled, the inclination angle of the double-sided photovoltaic assembly is changed, and the power generation output is improved.

[0012] Preferably, a hot-melt heat-conducting partition is provided between the energy storage battery compartment and the light-guiding water trough to isolate the energy storage battery compartment from the light-guiding water trough, thereby enabling the energy storage battery compartment to effectively dissipate heat.

[0013] Preferably, the top of the horizontal portion of the light-guiding water trough is coated with an infrared selective transmission film, which can reflect visible light and absorb infrared light.

[0014] Preferably, a plurality of the photovoltaic devices are arranged in an array to form a photovoltaic power generation system; wherein, a bimetallic reflector is provided at the top bottom of the inclined portion of the light-guiding trough of each photovoltaic device, and the angle with the ground is in the range of 30°-60°, reflecting sunlight in the gap between the two rows of photovoltaic devices, thereby further improving the efficiency of electricity conversion.

[0015] Preferably, the bimetallic reflector can change its bending degree as the temperature changes, thereby changing the reflection angle and improving the reflection utilization rate.

[0016] In summary, compared with the prior art, the safe energy storage multifunctional photovoltaic device provided by the present invention has the following beneficial effects:

[0017] 1. Significantly increases photovoltaic power generation output. This invention cleverly utilizes sunlight reflected from the lower horizontal portion of the light-guiding trough to increase the light intensity of the photovoltaic panel. Prior art uses concentrated photovoltaic technology to increase the illumination of photovoltaic cells and achieve increased power generation output. However, concentrated photovoltaics require precise tracking equipment, which is expensive and prone to failure. This invention coats the top of the horizontal portion of the light-guiding trough with an infrared selectively transparent film, reflecting visible light to the front of the photovoltaic panel. The infrared light is absorbed and used to heat the first medium flowing through it, thereby increasing the light output of the photovoltaic module from the front.

[0018] 2. Significantly improves the conversion efficiency of the photovoltaic system. While the present invention utilizes the light-guiding water trough to reflect light and increase output, the heat dissipation effect of the flowing water inside the light-guiding water trough significantly reduces the temperature of the bifacial photovoltaic module, which can drop by more than 30 degrees in the summer, thereby improving the photovoltaic cell conversion efficiency by more than 7% and extending the life of the bifacial photovoltaic module. Since the back side of the bifacial photovoltaic module is generally not exposed to light in installation scenarios, the back side light conversion capacity of the bifacial photovoltaic module cannot be fully utilized. The present invention utilizes the light-guiding effect of the light-guiding water trough to guide the sunlight directly below the bifacial photovoltaic module to the back side through the principle of optical fiber, maximizing the back side light conversion capacity and improving the overall power generation capacity of the photovoltaic module per unit area by more than 40%.

[0019] 3. It achieves simultaneous photovoltaic and solar thermal integration. Solar water heaters are also green and environmentally friendly products that fully utilize solar energy. However, the layout of the photovoltaic power station and the solar water heating panels conflict in terms of space. The present invention utilizes the light-guiding water trough to reflect light and increase output. The heat dissipation effect of the water flowing inside the light-guiding water trough not only dissipates heat for the double-sided photovoltaic modules, but also produces hot water due to the increased temperature of the water trough itself. This achieves simultaneous photovoltaic and solar thermal integration. Considering the power generation and heating of hot water, the present invention can achieve a roughly two-fold increase in light utilization per unit area.

[0020] 4. This invention achieves low-cost, high-reliability single-axis photovoltaic tracking. This invention utilizes a hydraulic piston. When the sun is high, the water pressure is appropriately reduced, causing the piston to move and the photovoltaic panel's tilt angle to increase. When the sun is low, the water pressure is appropriately increased, causing the piston to move in the opposite direction, reducing the photovoltaic panel's tilt angle and achieving single-axis tracking. Conventional solar trackers are expensive and inexpensive, while this invention only requires a single hydraulic piston to achieve tilt angle change and single-axis tracking, further improving power generation output.

[0021] 5. Convenient self-cleaning and effectively extending the life of photovoltaic cells. Shadows and dark spots are the biggest factors affecting the early damage of photovoltaic cells. Dark spots, in particular, are usually caused by bird droppings. The present invention only requires adjusting the water pressure. When the water pressure exceeds the threshold of the water pressure nozzle, water will automatically spray. The water mist spray can self-clean the channel and stimulate birds to a certain extent, thereby reducing bird droppings pollution and shadow damage to photovoltaic panels, thereby extending the life of photovoltaic panels.

[0022] 6. Achieved energy storage battery configuration with zero fire hazard. Existing energy storage batteries have great safety hazards and are prone to fire and explosion. If they are installed in a centralized manner, the consequences of a fire are extremely serious. The fire safety hazards of photovoltaic power generation must be resolved. The thermal conductivity of the hot-melt thermal conductive baffle provided in the present invention can effectively dissipate heat for the energy storage battery and reduce the risk of fire. Once a fire occurs in the battery, the hot-melt baffle melts when it encounters fire, and the circulating water surrounds the battery completely, achieving an excellent fire extinguishing effect. After a lithium battery catches fire, it must be fully immersed in water to achieve a fire extinguishing effect, but the fire protection system of the existing energy storage station is obviously unable to do so. The present invention utilizes circulating hot water resources for isolation and fire extinguishing in the event of a fire, achieving a method for configuring energy storage batteries with zero fire hazards, thereby laying the foundation for the safe cascade utilization of waste battery energy storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of the safe energy storage multifunctional photovoltaic device of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the appended Figure 1 , the technical solutions, structural features, objectives achieved and effects in the embodiments of the present invention are described in detail.

[0025] It should be noted that the drawings are in a very simplified form and use non-precise proportions. They are only used to conveniently and clearly assist in explaining the embodiments of the present invention, and are not used to limit the conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0026] It should be noted that, in the present invention, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only the elements explicitly listed, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0027] The present invention provides a safe energy storage multifunctional photovoltaic device, such as Figure 1 As shown, the safe energy storage type multifunctional photovoltaic device includes: a light guide water trough 1, which is fixedly set on a base with an inclined angle; the light guide water trough 1 includes a horizontal part 11 and an inclined part 12 that are conductively connected, and the interior of the horizontal part 11 and the inclined part 12 are both filled with a first medium (the first medium in this embodiment is water); a double-sided photovoltaic assembly 2, which is arranged on the inclined part 12 of the light guide water trough 1, and is used to convert solar energy into electrical energy; a support assembly 3, which is arranged at the bottom of the inclined part 12 of the light guide water trough 1, and can adjust the inclination angle of the inclined part 12 of the light guide water trough 1, and thus adjust the inclination angle of the double-sided photovoltaic assembly 2; an energy storage battery compartment 4, which is fixedly set at the bottom of the horizontal part 11 of the light guide water trough 1, and is electrically connected to the double-sided photovoltaic assembly 2, and stores the electrical energy generated by the double-sided photovoltaic assembly 2.

[0028] Among them, the horizontal part 11 and the inclined part 12 of the light-guiding water trough 1 are both transparent. As shown in Figure 1, the cross-section of the light-guiding water trough 1 is a broken line plate, hollow inside and sealed on all sides; at the same time, the inclined part 12 of the light-guiding water trough 1 matches the size of the double-sided photovoltaic module 2, so that the backlight surface of the double-sided photovoltaic module 2 fits flatly on the inclined part 12 of the light-guiding water trough 1. On the one hand, the present invention utilizes the horizontal part 11 of the light-guiding trough 1 to reflect the sunlight irradiated on the horizontal part 11 to the double-sided photovoltaic module 2, thereby increasing the light intensity on the front side of the double-sided photovoltaic module 2 and achieving an increase in power generation output; on the other hand, since there is no light on the back side of the installation location, the light conversion capacity of the backlight side of the double-sided photovoltaic module 2 cannot be exerted. The present invention utilizes the light-guiding effect of the light-guiding trough 1, and the sunlight directly irradiated on the front side of the double-sided photovoltaic module 2 passes through the double-sided photovoltaic module 2 and enters the light-guiding trough 1. Since the light-guiding trough 1 is transparent and filled with a first medium, the incident light is totally reflected in the light-guiding trough 1, so that the backlight side of the double-sided photovoltaic module 2 receives light, thereby increasing the power generation output; that is, through the principle of optical fiber, the light-guiding trough 1 guides the sunlight directly irradiated on the front side of the double-sided photovoltaic module 2 to its backlight side, maximizing the light conversion capacity of the backlight side of the double-sided photovoltaic module 2 and improving the overall power generation capacity of the photovoltaic module per unit area by more than 40%.

[0029] Furthermore, if Figure 1 As shown, a water inlet 5 is provided at one end of the horizontal portion 11 of the light-guiding water channel 1 for injecting a first medium. A water outlet 6 is provided at the top of the inclined portion 12 of the light-guiding water channel 1 for discharging the first medium that has absorbed heat. It should be noted that as the first medium flows into the light-guiding water channel 1 from the water inlet 5 and along the light-guiding water channel 1, the first medium absorbs heat generated by the bifacial photovoltaic panels 2 as they absorb solar energy to generate electricity, and is then discharged through the water outlet 6. Due to the heat dissipation effect of the first medium flowing within the light-guiding water channel 1, the temperature of the bifacial photovoltaic panels 2 is significantly reduced, by over 30 degrees Celsius in summer, thereby improving the photovoltaic cell conversion efficiency by over 7% and extending the lifespan of the bifacial photovoltaic panels 2. In addition, when the existing photovoltaic device is actually used, there is a conflict in the space occupied by the layout of the photovoltaic device and the solar water heating collection panel. The present invention realizes the simultaneous photovoltaic and thermal integration by setting up a light-guiding water trough 1. While the light-guiding water trough 1 reflects light to increase the power generation output, the heat dissipation effect of the water flowing inside the light-guiding water trough 1, on the one hand, dissipates heat for the double-sided photovoltaic components 2, and on the other hand, due to the increase in its own temperature, it has the effect of generating hot water, thereby achieving an increase of about 2 times in the solar energy utilization benefit per unit area.

[0030] In particular, shadows and dark spots are the biggest factors affecting the early damage of bifacial photovoltaic modules 2, especially dark spots, which are usually caused by bird droppings pollution. Based on this, Figure 1As shown, a pressure nozzle 7 is also provided at the top of the inclined portion 12 of the light-guiding water trough 1, which is connected to the light-guiding water trough 1, and the pressure nozzle 7 is directed toward the double-sided photovoltaic module 2; when in use, by adjusting the water pressure in the light-guiding water trough 1, when the water pressure in the light-guiding water trough 1 is greater than the threshold value of the pressure nozzle 7, the pressure nozzle 7 automatically sprays water, and through the water mist spraying, the front of the double-sided photovoltaic module 2 can be self-cleaned, and to a certain extent, it can cause stimulation to birds, thereby reducing bird droppings pollution, reducing the damage of shadows to the photovoltaic panel of the double-sided photovoltaic module 2, and playing a role in extending the life of the photovoltaic panel.

[0031] Among them, such as Figure 1 As shown, the support assembly 3 includes a fixed bracket 31 and a hydraulic piston 32; the fixed bracket 31 is fixedly arranged on the side of the bottom of the inclined surface part 12 of the light guide water trough 1 near the top; the hydraulic piston 32 is arranged on the side of the bottom of the inclined surface part 12 of the light guide water trough 1 near the horizontal part 11, and is connected to the light guide water trough 1; it should be noted that the deformation of the hydraulic piston 32 perpendicular to the inclined surface of the base can change the inclination angle of the bifacial photovoltaic module 2, thereby improving the power generation output; specifically, when the sun's altitude rises, the water pressure is appropriately reduced. After the water pressure is reduced, The pressure on the hydraulic piston 32 decreases accordingly, and the deformation of the hydraulic piston 32 decreases, thereby causing the bifacial photovoltaic module 2 to move away from the base slope in a direction perpendicular to the base slope, increasing the inclination angle of the bifacial photovoltaic module 2 relative to the vertical direction. When the sun's altitude decreases, the water pressure is appropriately increased. After the water pressure increases, the pressure on the hydraulic piston 32 increases accordingly, and the deformation of the hydraulic piston 32 increases, thereby causing the bifacial photovoltaic module 2 to move in the opposite direction, that is, the bifacial photovoltaic module 2 moves closer to the base slope perpendicular to the base slope, reducing the inclination angle of the bifacial photovoltaic module 2 relative to the vertical direction. By adjusting the water pressure within the light guide water tank 1 and controlling the deformation of the hydraulic piston 32, low-cost and high-reliability single-axis tracking of the bifacial photovoltaic module 2 is achieved.

[0032] Among them, such as Figure 1 As shown, a hot-melt heat-conducting partition 8 is provided between the energy storage battery compartment 4 and the light-guiding water trough 1 to isolate the energy storage battery compartment 4 from the light-guiding water trough 1, and the heat-conducting effect of the hot-melt heat-conducting partition 8 can effectively dissipate heat for the energy storage battery compartment 4, thereby reducing the risk of fire. Once a fire occurs in the energy storage battery compartment, the hot-melt heat-conducting partition 8 will melt when it encounters fire, and the circulating first medium (for example, water) can completely surround the battery, thereby achieving an excellent fire-extinguishing effect.

[0033] Furthermore, if Figure 1 As shown, the top of the horizontal part 11 of the light-guiding water trough 1 is also coated with an infrared selectively transparent film 9, which can reflect visible light in sunlight to the front of the double-sided photovoltaic module 2. The infrared light is absorbed and used to heat the first medium flowing through, thereby increasing the light while reducing the temperature of the double-sided photovoltaic module 2.

[0034] Furthermore, if Figure 1 As shown, when the multiple safe energy storage multifunctional photovoltaic device arrays provided by the present invention are electrically connected and arranged to form a photovoltaic power generation system, the utilization rate of the sunlight in the gap between the two rows of photovoltaic devices is low. Based on this, a bimetallic reflector 10 is also provided at the top of the bottom of the inclined portion 12 of the light-guiding water trough 1, and the angle range with the ground is 30°-60°; the sunlight in the gap between the two rows of photovoltaic devices is reflected to the front of the photovoltaic device in the adjacent row through the bimetallic reflector 10, thereby improving the utilization rate of the sunlight in the gap; the bimetallic reflector 10 can change the degree of bending as the temperature changes, thereby changing the reflection angle in different seasons as the solar altitude angle changes, thereby further improving the reflection utilization effect.

[0035] In summary, compared with existing photovoltaic power generation devices, the safe energy storage multifunctional photovoltaic device provided by the present invention has the advantages of high safety performance, high resource utilization, and long life.

[0036] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description is not intended to limit the present invention. After reading the above description, various modifications and substitutions of the present invention will become apparent to those skilled in the art. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A safe energy storage multifunctional photovoltaic device, characterized in that: include: A light-guiding water trough (1) is fixedly arranged on a base with an inclined angle; The light-guiding water trough (1) comprises a horizontal portion (11) and an inclined portion (12) which are connected to each other, and the interiors of the horizontal portion (11) and the inclined portion (12) are both filled with a first medium; the horizontal portion (11) and the inclined portion (12) of the light-guiding water trough (1) are both transparent, and the cross-section of the light-guiding water trough (1) is in the shape of a broken line plate, with a hollow interior and sealed on all sides; A double-sided photovoltaic assembly (2) is provided on the inclined portion (12) of the light-guiding water trough (1) and is used to convert solar energy into electrical energy; A support assembly (3) is arranged at the bottom of the inclined surface portion (12) of the light guide water trough (1) and can adjust the inclination angle of the inclined surface portion (12) of the light guide water trough (1); wherein the support assembly (3) includes a fixed bracket (31) and a hydraulic piston (32); The fixing bracket (31) is fixedly arranged on one side of the bottom of the inclined surface portion (12) of the light guide water trough (1) close to the top end; The hydraulic piston (32) is arranged on a side of the bottom of the inclined portion (12) of the light-guiding water trough (1) close to the horizontal portion (11), and is in communication with the light-guiding water trough (1); by changing the pressure of the first medium in the light-guiding water trough (1), the deformation of the hydraulic piston (32) is controlled, the tilt angle of the double-sided photovoltaic assembly (2) is changed, and the power generation output is increased; An energy storage battery compartment (4) is fixedly arranged at the bottom of the horizontal portion (11) of the light-guiding water trough (1) and is electrically connected to the double-sided photovoltaic assembly (2) to store the electrical energy generated by the double-sided photovoltaic assembly (2); The horizontal portion (11) reflects sunlight to the double-sided photovoltaic assembly (2), thereby increasing the power conversion efficiency of the photovoltaic device.

2. The safe energy storage multifunctional photovoltaic device according to claim 1, characterized in that: The inclined surface portion (12) of the light-guiding water trough (1) matches the size of the double-sided photovoltaic assembly (2).

3. The safe energy storage multifunctional photovoltaic device according to claim 1, characterized in that: One end of the horizontal portion (11) of the light-guiding water trough (1) is provided with a water inlet (5) for injecting a first medium; and the top end of the inclined portion (12) of the light-guiding water trough (1) is provided with a water outlet (6) for discharging the first medium.

4. The safe energy storage multifunctional photovoltaic device according to claim 1, characterized in that: A pressure nozzle (7) is provided at the top of the inclined surface portion (12) of the light-guiding water trough (1), which is in communication with the light-guiding water trough (1), and the pressure nozzle (7) faces the double-sided photovoltaic assembly (2), and can use the first medium to clean the front of the double-sided photovoltaic assembly (2).

5. The safe energy storage multifunctional photovoltaic device according to claim 1, characterized in that: A hot-melt heat-conducting partition (8) is provided between the energy storage battery compartment (4) and the light-guiding water trough (1), isolating the energy storage battery compartment (4) from the light-guiding water trough (1), and enabling the energy storage battery compartment (4) to effectively dissipate heat.

6. The safe energy storage multifunctional photovoltaic device according to claim 1, characterized in that: The top of the horizontal part (11) of the light-guiding water trough (1) is coated with an infrared selective transmission film (9) capable of reflecting visible light and absorbing infrared light.

7. The safe energy storage multifunctional photovoltaic device according to claim 1, characterized in that: A plurality of photovoltaic devices are arranged in an array to form a photovoltaic power generation system; wherein, a bimetallic reflector (10) is provided at the top of the bottom of the inclined surface portion (12) of the light guide trough (1) of each photovoltaic device, and the angle between the bimetallic reflector and the ground is in the range of 30°-60°, so as to reflect sunlight in the gap between two rows of photovoltaic devices, thereby further improving the efficiency of electric energy conversion.

8. The safe energy storage multifunctional photovoltaic device according to claim 7, characterized in that: The bimetallic reflector (10) can change its bending degree as the temperature changes, thereby changing the reflection angle and improving the reflection utilization rate.

Images