Light injection device for photovoltaic cells

Abstract

The application relates to a light injection device of a photovoltaic cell, which comprises a box, a roller and a pull rod, a light injection chamber is arranged in the box, a carrier table and a light source facing the carrier table are arranged in the light injection chamber; the roller is arranged outside the box and rotationally connected with the box; and the pull rod is arranged outside the box and connected with the box. The light injection device of the photovoltaic cell provided by the application sets the light injection chamber in the box, sets the carrier table and the light source facing the carrier table in the light injection chamber, irradiates the photovoltaic cell placed on the carrier table by the light source, and realizes the light injection of the photovoltaic cell. The pull rod and the roller rolling connected with the box are arranged outside the box, so that the operator can pull the box by the pull rod and the roller, and the box is convenient to move.

Description

Technical Field

[0001] This application relates to the field of solar cell manufacturing technology, and in particular to a light injection device for a photovoltaic cell. Background Technology

[0002] Solar cells, also known as photovoltaic cells, suffer from light-induced degradation (LID) during illumination. To address this issue, a light injection process is typically added during the fabrication of solar cells to effectively passivate them.

[0003] Some related technologies have large footprints and fixed locations for their optical injection equipment, which cannot meet the need for equipment mobility. Utility Model Content

[0004] Therefore, it is necessary to provide a light injection device for photovoltaic cells that is easy to move, in order to address the aforementioned technical problems.

[0005] An embodiment of this application provides a light injection device for a photovoltaic cell, including a housing, rollers, and a pull rod. The housing has a light injection chamber, a stage, and a light source facing the stage. The rollers are located outside the housing and are rotatably connected to the housing. The pull rod is located outside the housing and is connected to the housing.

[0006] In one embodiment, the housing also includes a first heat dissipation chamber located on one side of the light injection chamber in the height direction, and the first heat dissipation chamber is provided with a first heat dissipation component for dissipating heat from the light source.

[0007] In one embodiment, the first heat sink includes multiple spaced-apart first fins; a first fan is also provided in the first heat sink chamber, the first fan being used to drive airflow through the first fins.

[0008] In one embodiment, the first heat dissipation chamber includes a first air inlet and a first air outlet located on both sides in a first direction and communicating with the interior and exterior of the first heat dissipation chamber. A first fan drives airflow to enter the first heat dissipation chamber from the first air inlet and to flow out of the first heat dissipation chamber from the first air outlet. The first direction is intersecting with the height direction. A filter screen is covered on the first air inlet and / or the first air outlet.

[0009] In one embodiment, the housing also includes a second heat dissipation chamber located on the side of the light injection chamber opposite to the first heat dissipation chamber, and the second heat dissipation chamber is provided with a second heat dissipation component for dissipating heat from the stage.

[0010] In one embodiment, the second heat sink includes multiple spaced second fins; a second fan is also provided in the second heat sink chamber, the second fan being used to drive airflow through the second fins.

[0011] In one embodiment, the second heat dissipation chamber includes a second air inlet and a second air outlet located on both sides in the first direction and communicating with the inside and outside of the second heat dissipation chamber. A second fan drives airflow to enter the second heat dissipation chamber from the second air inlet and to flow out of the second heat dissipation chamber from the second air outlet. The first direction is intersecting the height direction. A filter screen is covered on the second air inlet and / or the second air outlet.

[0012] In one embodiment, a slide rail is also provided in the light injection chamber, and the stage is slidably connected to the slide rail so that the stage can move relative to the light injection chamber.

[0013] In one embodiment, the light source is an LED light panel that emits red light.

[0014] In one embodiment, the lever is movably connected to the housing so that the lever can extend or retract relative to the housing.

[0015] The photovoltaic cell light injection device provided in this application injects light into the photovoltaic cells by setting a light injection chamber inside the housing, and setting a stage and a light source facing the stage inside the light injection chamber, thereby illuminating the photovoltaic cells placed on the stage. By setting a pull rod and rollers that are rotatably connected to the housing outside the housing, the operator can use the pull rod and rollers to pull the housing, making it easy to move. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a photovoltaic cell light injection device according to some embodiments of this application.

[0018] Figure 2 The diagram shows a front view of an example photovoltaic cell light injection device after the cover plate and stage are concealed.

[0019] Figure 3 A schematic diagram of an example stage, cover plate, and photovoltaic cell is shown.

[0020] Figure 4 A schematic diagram of the structure of an example photovoltaic cell light injection device is shown behind a concealed cover and stage.

[0021] Figure 5A side view schematic diagram of an example photovoltaic cell light injection device is shown after a hidden cover plate.

[0022] Figure 6 This diagram shows a rear view of an example photovoltaic cell's light injection device after a hidden cover plate.

[0023] Figure label:

[0024] 10. Light injection device for photovoltaic cells; 20. Photovoltaic cells;

[0025] 100. Housing; 101. Partition; 102. Filter; 103. Cover; 104. Human-computer interaction module; 105. Receiving slot; 110. Light injection chamber; 111. Stage; 112. Light source; 120. First heat dissipation chamber; 121. First heat sink; 122. First fin; 123. First fan; 124. First air inlet; 125. First air outlet; 126. Notch; 130. Second heat dissipation chamber; 131. Second heat sink; 132. Second fin; 133. Second fan; 134. Second air inlet; 135. Second air outlet; 140. Control chamber;

[0026] 200. Rollers;

[0027] 300, pull rod;

[0028] x, first direction; y, second direction; z, altitude direction. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 application.

[0031] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0035] The light injection device and photovoltaic support for photovoltaic cells provided in the embodiments of this application will be described below with reference to the accompanying drawings. It should be noted that in the drawings, the x-direction is the height direction, the y-direction is the first direction, and the z-direction is the height direction. In the drawings, for ease of drawing, the dimensions are not necessarily proportional to the actual dimensions.

[0036] Please refer to Figures 1 to 3 , Figure 1 This is a schematic diagram of the structure of a photovoltaic cell light injection device according to some embodiments of this application. Figure 2 The diagram shows a front view of an example photovoltaic cell light injection device after the cover plate and stage are concealed. Figure 3 A schematic diagram of an example stage, cover plate, and photovoltaic cell is shown.

[0037] like Figures 1 to 3 As shown, an embodiment of this application provides a light injection device 10 for a photovoltaic cell, including a housing 100, rollers 200, and a pull rod 300. The housing 100 contains a light injection chamber 110, which contains a stage 111 and a light source 112 facing the stage 111. The rollers 200 are located outside the housing 100 and rotatably connected to it. The pull rod 300 is located outside the housing 100 and connected to it.

[0038] Optionally, the platform 111 supports the photovoltaic cells 20. The platform 111 and the light source 112 are spaced apart along the height direction (z-direction in the figure). The light source 112 is located above the platform 111 and illuminates the photovoltaic cells 20 on the platform 111 from above. The rollers 200 are located below the housing 100, and the pull rod 300 extends along the height direction z. At least part of the pull rod 300 is located on the upper surface of the housing 100 in the height direction z, so that the operator can move the housing 100 on the ground by pulling the pull rod 300. By arranging the platform 111 and the light source 112 vertically, and the pull rod 300 and the rollers 200 vertically, the structure conforms to common sense and ergonomics, reducing the difficulty of operator training.

[0039] Optionally, the stage 111 can hold various photovoltaic cells 20 with dimensions of 250*250mm and below. In this embodiment, a photovoltaic cell 20 with a size of 210*105mm is used as an example. Of course, in other embodiments, the size of the stage 111 and the housing 100 can be adjusted according to requirements so that the photovoltaic cell focusing device 10 can be adapted to other types of photovoltaic cells 20.

[0040] It should be noted that the photovoltaic cell light injection device 10 in this embodiment is only used for the light injection process of the photovoltaic cell 20 and does not include the drying and sintering functions of the photovoltaic cell 20. Therefore, the device can be miniaturized and refined to achieve its portable function.

[0041] The photovoltaic cell light injection device 10 of this application embodiment provides a light injection chamber 110 within a housing 100, and a stage 111 and a light source 112 facing the stage 111 are provided within the light injection chamber 110. The light source 112 illuminates the photovoltaic cell 20 placed on the stage 111, thereby injecting light into the photovoltaic cell 20. By providing a pull rod 300 and rollers 200 that are rotatably connected to the housing 100 outside the housing 100, the operator can use the pull rod 300 and rollers 200 to pull the housing 100, making it easy to move.

[0042] Please refer to Figures 1 to 5 , Figure 4 A schematic diagram of the structure of an example photovoltaic cell light injection device is shown behind a concealed cover and stage. Figure 5 A side view schematic diagram of an example photovoltaic cell light injection device is shown after a hidden cover plate.

[0043] like Figures 1 to 5 As shown, in some embodiments, the housing 100 also includes a first heat dissipation chamber 120 located on the z-side of the light injection chamber 110 in the height direction, and the first heat dissipation chamber 120 is provided with a first heat dissipation component 121 for dissipating heat from the light source 112.

[0044] Optionally, the first heat dissipation chamber 120 is located above the light injection chamber 110, and a partition 101 is provided between the first heat dissipation chamber 120 and the light injection chamber 110. The first heat sink 121 and the light source 112 abut against the upper and lower surfaces of the partition 101, respectively. The partition 101 is made of a material with high thermal conductivity, such as metal, to quickly transfer the heat generated by the light source 112 to the first heat sink 121. Thermally conductive adhesive to improve heat transfer efficiency may also be provided between the light source 112 and the partition 101, and between the partition 101 and the first heat sink 121.

[0045] Optionally, the first heat sink 121 includes multiple spaced-apart first fins 122. The first fins 122 extend along a first direction (x direction in the figure), and the multiple first fins 122 are spaced-apart along a second direction (y direction in the figure). The first fins 122 are made of a material with high thermal conductivity, such as metal, to quickly transfer the heat generated by the light source 112 to the air. The first direction x, the second direction y, and the height direction z are arranged in pairs, and the first direction x can be understood as the left-right direction, and the second direction y can be understood as the front-back direction.

[0046] Optionally, a first fan 123 is also provided in the first heat dissipation chamber 120. The first fan 123 is used to drive airflow through the first fin 122 and use the airflow to remove the heat on the first fin 122, thereby cooling the light source 112.

[0047] The photovoltaic cell light injection device 10 of this application embodiment improves its heat dissipation efficiency by including a plurality of spaced-apart first fins 122 in the first heat sink 121, thereby increasing the surface area of ​​the first fins 122. Furthermore, by providing a first fan 123 within the first heat dissipation chamber 120, the first fan 123 blows airflow through the first fins 122, further improving the heat dissipation efficiency of the first heat sink 121 for the light source 112.

[0048] In some embodiments, the first heat dissipation chamber 120 includes a first air inlet 124 and a first air outlet 125 located on both sides in the first direction x and communicating with the inside and outside of the first heat dissipation chamber 120. The first fan 123 drives the airflow to enter the first heat dissipation chamber 120 from the first air inlet 124 and flow out of the first heat dissipation chamber 120 from the first air outlet 125.

[0049] When the airflow flows along the first direction x in the first heat dissipation chamber 120, it will flow through the first fin 122 and carry away the heat on the first fin 122.

[0050] Optionally, the first fin 122 is provided with a notch 126, and the notches 126 on each first fin 122 are aligned along the second direction y. The notches 126 are used to accommodate the first fan 123, so that after the first fan 123 is arranged, the first fin 122 can fill the first heat dissipation chamber 120 as much as possible, thereby improving the heat dissipation efficiency of the first heat sink 121. The notch 126 is located on at least one side of the first fin 122 in the first direction x, so that the first fan 123 is close to the first air inlet 124 or the first air outlet 125, which facilitates the disassembly, assembly, and subsequent maintenance of the first fan 123.

[0051] Optionally, a filter screen 102 is provided on the first air inlet 124 and / or the first air outlet 125 to filter dust. In this embodiment, it is illustrated that both the first air inlet 124 and the first air outlet 125 are covered with filter screens 102. The filter screen 102 on the first air inlet 124 reduces the probability of dust entering the first heat dissipation chamber 120 from the first air inlet 124 when the first fan 123 is turned on, thereby reducing the dust accumulation rate on the surface of the first fins 122 and improving the heat dissipation efficiency of the first heat sink 121. The filter screen 102 on the first air outlet 125 reduces the probability of dust entering the first heat dissipation chamber 120 from the first air outlet 125 when the first fan 123 is turned off, further reducing the dust accumulation rate on the surface of the first fins 122 and improving the heat dissipation efficiency of the first heat sink 121.

[0052] The photovoltaic cell light injection device 10 of this application embodiment reduces the probability of dust entering the first heat dissipation chamber 120 by covering the surfaces of the first air inlet 124 and the first air outlet 125 with a filter screen 102, thereby reducing the accumulation rate of dust on the surface of the first fin 122 and further improving the heat dissipation efficiency of the first heat dissipation component 121.

[0053] In some embodiments, the housing 100 also includes a second heat dissipation chamber 130 located on the side of the light injection chamber 110 opposite to the first heat dissipation chamber 120, and the second heat dissipation chamber 130 is provided with a second heat dissipation component 131 for dissipating heat from the stage 111.

[0054] Optionally, the second heat dissipation chamber 130 is located below the light injection chamber 110, and a partition 101 is provided between the second heat dissipation chamber 130 and the light injection chamber 110. The second heat sink 131 and the stage 111 abut against the upper and lower surfaces of the partition 101, respectively. Thermally conductive adhesive to improve heat transfer efficiency may also be provided between the stage 111 and the partition 101, and between the partition 101 and the second heat sink 131.

[0055] Optionally, the second heat sink 131 includes multiple spaced second fins 132, which extend along a first direction x and are spaced along a second direction y. The second fins 132 are made of a material with high thermal conductivity, such as metal, to quickly transfer the heat generated by the light source 112 to the air.

[0056] Optionally, a second fan 133 is also provided in the second heat dissipation chamber 130. The second fan 133 is used to drive airflow through the second fin 132 and use the airflow to remove the heat on the second fin 132, thereby cooling the stage 111.

[0057] The photovoltaic cell light injection device 10 of this application embodiment improves its heat dissipation efficiency by including multiple spaced second fins 132 in the second heat sink 131, thereby increasing the surface area of ​​the second fins 132. Furthermore, by installing a second fan 133 within the second heat dissipation chamber 130, the second fan 133 blows airflow across the second fins 132, further improving the heat dissipation efficiency of the second heat sink 131 on the stage 111. This prevents the substrate of the photovoltaic cell 20 placed on the stage 111 from overheating and burning, thus improving the yield rate of the photovoltaic cell 20 after light injection.

[0058] In some embodiments, the second heat dissipation chamber 130 includes a second air inlet 134 and a second air outlet 135 located on both sides in the first direction x and connected to the inside and outside of the second heat dissipation chamber 130. The second fan 133 drives the airflow to enter the second heat dissipation chamber 130 from the second air inlet 134 and flow out of the second heat dissipation chamber 130 from the second air outlet 135.

[0059] When the airflow flows along the first direction x in the second heat dissipation chamber 130, it will flow through the second fin 132 and carry away the heat on the second fin 132.

[0060] Optionally, the second fin 132 is provided with a notch 126, and the notches 126 on each second fin 132 are aligned along the second direction y. The notches 126 are used to accommodate the second fan 133, so that after the second fan 133 is arranged, the second fin 132 can fill the second heat dissipation chamber 130 as much as possible, thereby improving the heat dissipation efficiency of the second heat sink 131. The notch 126 is located on at least one side of the second fin 132 in the first direction x, so that the second fan 133 is close to the second air inlet 134 or the second air outlet 135, which facilitates the disassembly, assembly, and subsequent maintenance of the second fan 133.

[0061] Optionally, a filter screen 102 is provided on the second air inlet 134 and / or the second air outlet 135 to filter dust. In this embodiment, it is illustrated that both the second air inlet 134 and the second air outlet 135 are covered with filter screens 102. The filter screen 102 on the second air inlet 134 reduces the probability of dust entering the second heat dissipation chamber 130 from the second air inlet 134 when the second fan 133 is turned on, thereby reducing the dust accumulation rate on the surface of the second fins 132 and improving the heat dissipation efficiency of the second heat sink 131. The filter screen 102 on the second air outlet 135 reduces the probability of dust entering the second heat dissipation chamber 130 from the second air outlet 135 when the second fan 133 is turned off, further reducing the dust accumulation rate on the surface of the second fins 132 and improving the heat dissipation efficiency of the second heat sink 131.

[0062] The photovoltaic cell light injection device 10 of this application embodiment reduces the probability of dust entering the second heat dissipation chamber 130 by covering the surfaces of the second air inlet 134 and the second air outlet 135 with a filter screen 102, thereby reducing the accumulation rate of dust on the surface of the second fin 132 and further improving the heat dissipation efficiency of the second heat dissipation component 131.

[0063] In some embodiments, a slide rail (not shown) is also provided in the light injection chamber 110, and the stage 111 is slidably connected to the slide rail so that the stage 111 can move relative to the light injection chamber 110.

[0064] Optionally, the slide rail extends along the second direction y so that the stage 111 can move along the second direction y. When at least part of the stage 111 moves out of the light injection chamber 110 along the second direction y, the operator can place or remove the photovoltaic cell 20 by means of a special suction cup.

[0065] Optionally, the housing 100 also includes a cover plate 103, one of which is connected to the stage 111, such that when the stage 111 moves along the slide rail to be completely inside the light injection chamber 110, the cover plate 103 connected to the stage 111 closes the light injection chamber 110, and when the stage 111 moves along the slide rail to be partially removed from the light injection chamber 110, the light injection chamber 110 opens.

[0066] Optionally, the first heat dissipation chamber 120 and the second heat dissipation chamber 130 are also provided with cover plates 103 for sealing the chambers.

[0067] The photovoltaic cell light injection device 10 of this application embodiment is equipped with a slide rail so that the stage 111 can move relative to the light injection chamber 110, which facilitates the placement and removal of the photovoltaic cell 20.

[0068] In some embodiments, a control chamber 140 is also provided on the side of the first heat dissipation chamber 120 away from the light injection chamber 110. The control chamber 140 contains a control module (not shown), which can be a microprocessor. The control module is electrically connected to the light source 112, the first fan 123, and the second fan 133, and is used to control the start and stop of the light source 112, the first fan 123, and the second fan 133.

[0069] Optionally, a thermometer is provided inside the light injection chamber 110. The thermometer is electrically connected to the control module. The control module can monitor the temperature inside the light injection chamber 110 through the thermometer, and control the first fan 123 and the second fan 133 to turn on when the temperature inside the light injection chamber 110 reaches a threshold, so as to reduce the temperature of the light source 112 and the photovoltaic cell 20 on the stage 111.

[0070] Optionally, a human-machine interface module 104 electrically connected to the control module is provided on the upper surface of the housing 100. The human-machine interface module 104 is equipped with a display screen and operation buttons. The display screen is used to display parameters inside the housing 100, such as the start / stop status and start / stop time of the light source 112, the first fan 123 and the second fan 133, and the temperature inside the light injection chamber 110. The operation buttons are used to control the start / stop of the light source 112, the first fan 123 and the second fan 133.

[0071] The photovoltaic cell light injection device 10 of this application embodiment, by setting up a control module and a human-machine interaction module 104, enables the operator to manually control the start and stop of the light source 112, the first fan 123 and the second fan 133.

[0072] In some embodiments, the light source 112 is an LED light panel emitting red light with a wavelength of 600nm and an illuminance of 50-80sun. The LED light panel and the stage 111 are spaced 100mm apart in the height direction z. With the heat dissipation of the first heat dissipation chamber 120 and the second heat dissipation chamber 130, the temperature of the photovoltaic cell 20 on the stage 111 can be controlled at 180-200℃. After the photovoltaic cell 20 is irradiated with red light for 5-7 minutes, the defect states in the carrier filling material of the photovoltaic cell 20 are excited by photothermal stimulation, reducing recombination centers, thereby improving carrier lifetime, reducing surface recombination rate, increasing open circuit voltage, and ultimately improving the efficiency of the photovoltaic cell 20 by 0.2%-0.5%.

[0073] Because the critical passivation layer of the photovoltaic cell 20 experiences increased defect state density and degraded passivation effect due to the escape of hydrogen (H) atoms at high temperatures (above 200 degrees Celsius), resulting in a significant decrease in open-circuit voltage (Voc), temperature control is crucial in the traditional photovoltaic cell 20 light injection process. Based on material properties and industry practice, the cell temperature during light injection typically needs to be strictly controlled below 150°C. This embodiment also proposes a light injection method to improve the efficiency of the photovoltaic cell 20, measured using the aforementioned light injection device. To eliminate the influence of differences in power output from different constant voltage power supplies, the experimental parameters were based on the steady-state temperature of the photovoltaic cell 20 surface when the distance between the photovoltaic cell 20 and the surface irradiated by the light source 112 was 100 mm. This steady-state temperature was measured after repeated calibration using temperature-measuring test strips, a temperature gun, and an infrared temperature sensor attached to multiple points on the surface of the photovoltaic cell 20.

[0074] Specifically, large-area LED light panels are typically approximations of Lambertian light sources, with the following light intensity distribution:

[0075] I(θ) = I0·cosθ

[0076] Where I0 refers to the light intensity (W / sr) in the vertical direction (θ=0), and θ is the angle between the observation direction and the normal.

[0077] Therefore, at a distance d, the irradiance (power received per unit area) is:

[0078] E(d,θ)=(I0·cos2θ) / d2(Note:cos2θ comes from angle attenuation + projected area effect)

[0079] Assumptions: The area of ​​the LED light panel is Aled, the total luminous flux (light power) is Pled (W), the area of ​​the object is Aobj, the distance from the light panel is d, and the angle between the normals is θ.

[0080] The light power received by the object:

[0081] Pabs=α·∫AledE(d,θ)dA

[0082] Where α represents the absorptivity of the object (0≤α≤1), and the integration range is the entire area of ​​the object illuminated by the LED light panel.

[0083] Simplifying the scenario to a situation where light source 112 illuminates perpendicularly, and photovoltaic cell 20 is small and directly facing the center of light source 112 (θ≈0), the formula can be approximated as:

[0084] Pabs≈α·Pled·Aobj / (πd2+Aled)

[0085] When d is much larger than Aled (the distance from Aled to light source 112 is much larger than the area of ​​the light source 112), the formula can be regarded as a point light source model:

[0086] Pabs≈α·Pled·Aobj / πd2

[0087] Using the above formula, the transient temperature rise (ignoring heat dissipation) can be obtained as follows:

[0088] ΔT(t) = Pabs·t(mc), where m is the mass of the object (kg), c is the specific heat capacity (J / (kg·K)), and t is the irradiation time (s).

[0089] If we consider the heat dissipation (convection / radiation) of an object, and that it eventually reaches an equilibrium temperature after a period of time, then:

[0090] Pabs = h·Aobj·(T-Tenv), where h is the overall heat transfer coefficient (W / (m²·K)) and Tenv is the heat dissipation temperature (K).

[0091] The steady-state temperature rise is obtained by solving for:

[0092] ΔT=T-Tenv=Pabs(h·Aobj)

[0093] Using the above method, it was calculated that the distance between the light source 112 and the stage 111 in the height direction z is 100mm, the temperature of the photovoltaic cell 20 is controlled at 180-200℃, and the efficiency of the photovoltaic cell 20 can be increased by 0.2%-0.5% after red light irradiation for 5-7 minutes.

[0094] Please refer to Figure 6 , Figure 6 This diagram shows a rear view of an example photovoltaic cell's light injection device after a hidden cover plate.

[0095] like Figure 6 As shown, in some embodiments, the pull rod 300 is movably connected to the housing 100 so that the pull rod 300 can extend or retract relative to the housing 100.

[0096] Optionally, the box body 100 has a receiving groove 105 extending along the height direction z on the side opposite to the cover plate 103. At least part of the pull rod 300 is received in the receiving groove 105, and the pull rod 300 is a telescopic rod, so that the pull rod 300 can be housed in the receiving groove 105 to reduce the volume when it is retracted, and the pull rod 300 can protrude out of the box body 100 when it is extended to facilitate the operator to pull it.

[0097] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0098] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A light injection device for a photovoltaic cell, characterized in that, include: The enclosure contains a light injection chamber, which contains a stage and a light source facing the stage. Rollers are located outside the housing and are rotatably connected to the housing; A pull rod is located outside the box and connected to the box body.

2. The light injection device for a photovoltaic cell according to claim 1, characterized in that, The housing also includes a first heat dissipation chamber located on one side of the light injection chamber in the height direction, and the first heat dissipation chamber is provided with a first heat dissipation component for dissipating heat from the light source.

3. The light injection device for a photovoltaic cell according to claim 2, characterized in that, The first heat sink includes multiple spaced-apart first fins; The first heat dissipation chamber is also equipped with a first fan, which is used to drive airflow through the first fin.

4. The light injection device for a photovoltaic cell according to claim 3, characterized in that, The first heat dissipation chamber includes a first air inlet and a first air outlet located on both sides in a first direction and both communicating with the inside and outside of the first heat dissipation chamber. The first fan drives airflow to enter the first heat dissipation chamber from the first air inlet and to flow out of the first heat dissipation chamber from the first air outlet. The first direction is intersecting with the height direction. The first air inlet and / or the first air outlet are covered with a filter screen.

5. The light injection device for a photovoltaic cell according to claim 2, characterized in that, The housing also includes a second heat dissipation chamber located on the side of the light injection chamber opposite to the first heat dissipation chamber, and the second heat dissipation chamber is provided with a second heat dissipation component for dissipating heat from the stage.

6. The light injection device for a photovoltaic cell according to claim 5, characterized in that, The second heat sink includes multiple spaced-apart second fins; The second heat dissipation chamber is also equipped with a second fan, which is used to drive airflow through the second fins.

7. The light injection device for a photovoltaic cell according to claim 6, characterized in that, The second heat dissipation chamber includes a second air inlet and a second air outlet located on both sides in the first direction and connected to the inside and outside of the second heat dissipation chamber. The second fan drives airflow to enter the second heat dissipation chamber from the second air inlet and to flow out of the second heat dissipation chamber from the second air outlet. The first direction is intersecting the height direction. The second air inlet and / or the second air outlet are covered with a filter screen.

8. The light injection device for a photovoltaic cell according to claim 1, characterized in that, The light injection chamber is also equipped with a slide rail, and the stage is slidably connected to the slide rail so that the stage can move relative to the light injection chamber.

9. The light injection device for a photovoltaic cell according to claim 1, characterized in that, The light source is an LED light panel that emits red light.

10. The light injection device for a photovoltaic cell according to claim 1, characterized in that, The pull rod is movably connected to the housing so that the pull rod can extend or shorten relative to the housing.

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