Electrical performance detection device of photovoltaic module

Abstract

The utility model relates to the technical field of solar cells, and discloses an electrical property detection device of a photovoltaic module, which comprises a plurality of light reflecting pieces, a plurality of light reflecting plates, a plurality of light reflecting plates and a plurality of light reflecting plates, the light condensing device comprises a light diffusing part, at least two light polarizing parts and a constant-temperature cavity from top to bottom, the light diffusing part is used for receiving the sunlight reflected by the light reflecting part and enabling the sunlight transmitted to the light polarizing parts to be in a scattering state, and at least one light polarizing part can rotate relative to the other light polarizing part so as to reduce the sunlight intensity in the scattering state; the constant-temperature cavity is used for placing a photovoltaic module; the induction device is used for collecting the intensity value of sunlight in the constant-temperature cavity; the control unit is electrically connected with the sensing device, the light reflecting pieces and the light gathering device, and the control unit is used for adjusting the number of the used light reflecting pieces and the rotating angle of the light polarizing piece, so that the intensity of the sunlight transmitted to the constant-temperature cavity is kept within a preset range. Detection errors are reduced, and high accuracy of detection results is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of solar cells, in particular to an electrical performance detection device for a photovoltaic component. Background Art

[0002] In order to evaluate whether the performance of photovoltaic modules is suitable for industrial production, it is necessary to test the electrical performance of photovoltaic modules. Among them, the rated power indicates the maximum power that a single photovoltaic module can output, which is the most fundamental performance parameter for measuring the electrical performance of photovoltaic modules. In order to ensure the accuracy of the measured electrical performance data, the sunlight intensity needs to be controlled to 1000W / m when testing the rated power. 2 However, the intensity of sunlight is limited by changes in illumination time, weather, cloud cover, etc., making it difficult for sunlight to reach 1000W / m 2 , resulting in poor accuracy of the measured rated power value, which makes it difficult to effectively reflect the electrical performance of the PV modules. Utility Model Content

[0003] The embodiment of the utility model discloses an electrical performance detection device for a photovoltaic module, which can make the intensity of sunlight reach the standard of electrical performance detection and ensure the accuracy of electrical performance test results.

[0004] The present application discloses a photovoltaic module electrical performance detection device, the detection device comprising:

[0005] A plurality of reflective elements, when sunlight irradiates the reflective elements, any of the reflective elements is used to reflect the sunlight;

[0006] A light concentrator, the light concentrator comprising, from top to bottom, a light diffuser, at least two polarizers, and a constant temperature chamber, the light diffuser being used to receive the sunlight reflected by the reflector and causing the sunlight transmitted to the polarizer to be in a scattered state, at least one of the polarizers being able to rotate relative to another polarizer to reduce the intensity of the sunlight in a scattered state, and the constant temperature chamber being used to place the photovoltaic module;

[0007] A sensing device, the sensing device is used to collect the intensity value of the sunlight in the constant temperature chamber;

[0008] A control unit, wherein the control unit is electrically connected to the sensing device, the reflective element and the focusing device, and the control unit is used to adjust the number of the reflective elements used and the rotation angle of the polarizing element so that the intensity of the sunlight transmitted to the constant temperature chamber is maintained within a preset range.

[0009] Furthermore, the detection device also includes a first driving component, the first driving component is electrically connected to the control unit, and the first driving component is connected to the polarizer to drive the polarizer to rotate.

[0010] Furthermore, the light focusing device further comprises a housing, the light diffuser, the polarizer and the constant temperature chamber are arranged in the housing, the light diffuser is fixedly connected to the housing, and at least one of the polarizers is rotatably connected to the housing;

[0011] The first driving assembly includes a driving member disposed on the polarizing member, a gear disposed on a driving end of the driving member, and a tooth structure disposed around the inner wall of the housing, and the gear is meshed with the tooth structure.

[0012] Further, the polarizer includes a first polarizer and a second polarizer, the first polarizer can rotate relative to the second polarizer, the first polarizer includes a first frame and a lens arranged in the first frame, and a roller is arranged on the lower surface of the first frame;

[0013] The second polarizer includes a second frame and a lens arranged in the second frame, and the upper surface of the second frame is used to support the roller.

[0014] Furthermore, the first lens frame and the second lens frame are spaced apart from each other, a first receiving groove is provided on a lower surface of the first lens frame, a second receiving groove is provided on an upper surface of the second lens frame, and the roller is provided between the first receiving groove and the second receiving groove.

[0015] Furthermore, the constant temperature chamber is connected to a temperature control device, and the temperature control device is used to keep the temperature of the constant temperature chamber within a preset range.

[0016] Furthermore, the temperature control device includes an air conditioner and a temperature detection component, the temperature detection component is electrically connected to the air conditioner, and the temperature detection component is used to detect the temperature of the constant temperature chamber.

[0017] Furthermore, a bracket is provided in the constant temperature chamber, and the bracket is used to place the photovoltaic module.

[0018] Furthermore, the detection device also includes a second driving assembly, the second driving assembly is connected to the plurality of reflective elements respectively, and can drive the plurality of reflective elements to rotate respectively, and the second driving assembly is electrically connected to the control unit.

[0019] Furthermore, a sun tracking device is connected to the reflective element, and the sun tracking device is used to drive the reflective element to track the trajectory of the sun.

[0020] Furthermore, the solar tracking device is a dual-axis tracking system.

[0021] Furthermore, the area of ​​any of the reflective elements is larger than the area of ​​the light-scattering element.

[0022] Compared with the prior art, the beneficial effects of this application include:

[0023] The present application provides an electrical performance detection device for a photovoltaic module, the detection device includes a plurality of reflectors, a focusing device, a sensing device and a control unit, wherein the sensing device collects the sunlight intensity value of the constant temperature chamber, and the control unit controls the number of reflectors used and the rotation angle of the polarizer according to the sunlight intensity value collected by the sensing device, so that the intensity of sunlight finally irradiated into the constant temperature chamber is kept within a preset range, ensuring that the measured electrical performance data has a high accuracy. Moreover, the detection device can adjust the intensity value of sunlight under different weather, cloud layer, light exposure time, etc. to the preset range of electrical performance detection, thereby achieving full utilization of sunlight, ensuring the accuracy of detection, and reducing production costs.

[0024] Specifically, when sunlight irradiates the reflector, the reflector reflects the sunlight to the focusing device, and the intensity of the sunlight transmitted to the focusing device is adjusted by adjusting the number of reflectors used. Since the focusing device includes a diffuser, at least two polarizers, and a constant temperature chamber, the sunlight reflected by the reflector will first pass through the diffuser. Under the action of the diffuser, the light source is in a scattered state, thereby ensuring that the sunlight transmitted to the constant temperature chamber has a high uniformity and the accuracy of the detection result. Moreover, since one polarizer can rotate relative to another polarizer, the intensity of the sunlight in the scattered state is reduced by adjusting the rotation angle, thereby ensuring that the intensity of the sunlight transmitted to the constant temperature chamber reaches a preset range. In other words, the number of reflectors used belongs to the coarse adjustment process. By increasing or decreasing the number of reflectors used, the intensity of sunlight transmitted to the focusing device is greatly adjusted, and by adjusting the rotation angle of the polarizer, the purpose of fine adjustment is achieved. Through the synergistic effect of the two, it is ensured that the intensity of sunlight ultimately reaching the photovoltaic module reaches the preset standard value, so that the error of the electrical performance test results of the photovoltaic module is small and the detection accuracy is high.

[0025] In summary, the detection device of the present application fully utilizes sunlight through the mutual cooperation of multiple reflective elements, focusing devices, sensing devices and control units, reduces production costs, and ensures that the intensity of sunlight received by the photovoltaic module is within a preset range, thereby ensuring the high accuracy of the electrical performance detection of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 is a schematic diagram of the structure of the detection device provided in the embodiment of the present application;

[0028] Figure 2 is a schematic diagram of the structure of a light focusing device provided in an embodiment of the present application;

[0029] Figure 3 is a structural schematic diagram of a first drive assembly provided in an embodiment of the present application;

[0030] Figure 4 This is an embodiment of the present application Figure 3 A magnified view of middle;

[0031] Figure 5 is a schematic structural diagram of a polarizer provided in an embodiment of the present application;

[0032] Figure 6 is a schematic diagram of the structure of the roller provided in an embodiment of the present application;

[0033] Figure 7 It is a structural schematic diagram of the air conditioner provided in an embodiment of the present application.

[0034] Icons: 1. Reflector; 2. Focusing device; 21. Diffuser; 22. Polarizer; 221. First polarizer; 2211. First lens frame; 2211a. First receiving slot; 2212. First lens; 222. Second polarizer; 2221. Second lens frame; 2221a. Second receiving slot; 23. Constant temperature chamber; 231. Bracket; 3. Sensing device; 4. Control unit; 5. Housing; 51. Gear structure; 6. First drive assembly; 61. Drive element; 62. Gear; 7. Roller; 8. Air conditioner; 81. Air inlet duct; 82. Air outlet duct; 83. Host; 9. Sun tracking device. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] In the present invention, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0037] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0038] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0039] The technical solution provided by the utility model will be further described below in conjunction with embodiments and drawings.

[0040] Rated power is the fundamental performance parameter for evaluating the electrical performance of photovoltaic modules. The rated power test needs to be carried out under standard test conditions, that is, it is necessary to ensure that the intensity and temperature of the sunlight received by the module during the test can reach the values ​​required for the test, so as to ensure that the data obtained from the test has a high accuracy. In addition, due to the capacitive characteristics of solar cells, when the photovoltaic module just receives light, the accuracy of the measured data is low. Only after a period of exposure can the measured data be guaranteed to have a high accuracy. Among them, although sunlight is a continuous light source, it is limited by the influence of weather, clouds, air quality, etc., making it difficult for the intensity of sunlight irradiating the photovoltaic module to remain stable within the test range for a long time, resulting in large deviations in the measured electrical performance data.

[0041] At present, steady-state simulators and pulse simulators are used as simulated light sources of sunlight to test photovoltaic modules. Among them, the steady-state simulator can adjust the light source intensity to the preset range of detection, and can provide stable light source intensity for a long time, but the cost of the steady-state detector is high, which undoubtedly increases the production cost of photovoltaic modules and is not suitable for large-scale detection; the pulse simulator provides light source for a short time, and collects the electrical performance data of the photovoltaic module in a short time when it is irradiated by the light source, and performs simulation calculations based on the data to obtain the electrical performance data of the photovoltaic module, but due to different types and different powers of photovoltaic modules, the parameters during detection are different, and the parameters need to be adjusted before each detection, which requires the user to have high professional skills, and due to the high frequency of parameter adjustment, it is undoubtedly increased. The difficulty of detection is difficult to avoid the existence of detection errors, and the use of such detection methods is time-consuming and has low versatility.

[0042] Based on the above problems, an embodiment of the present application provides an electrical performance detection device for a photovoltaic module, which can make full use of sunlight so that the sunlight finally transmitted to the photovoltaic module can be kept within the detection conditions.

[0043] The present application embodiment provides a photovoltaic module electrical performance detection device, such as Figure 1 to Figure 2 As shown, the detection device comprises:

[0044] A plurality of reflectors 1, when sunlight irradiates the reflectors 1, any reflector 1 is used to reflect the sunlight;

[0045] The light concentrator 2 includes, from top to bottom, a light diffuser 21, at least two polarizers 22, and a constant temperature chamber 23. The light diffuser 21 is used to receive sunlight reflected by the reflector 1 and make the sunlight transmitted to the polarizer 22 present a scattered state. At least one polarizer 22 can rotate relative to another polarizer 22 to reduce the intensity of the sunlight in the scattered state. The constant temperature chamber 23 is used to place the photovoltaic module.

[0046] The sensing device 3 is used to collect the intensity value of sunlight in the constant temperature chamber 23;

[0047] The control unit 4 is electrically connected to the sensing device 3, the reflector 1 and the focusing device 2. The control unit 4 is used to adjust the number of reflectors 1 used and the rotation angle of the polarizer 22 so that the intensity of sunlight transmitted to the constant temperature chamber 23 is maintained within a preset range.

[0048] When testing the electrical performance of photovoltaic modules, the intensity of sunlight irradiating the photovoltaic modules needs to be kept within the error range of the standard value, which is 1000W / m 2When the intensity of sunlight reaches the error range of the test, the accuracy of the measured electrical performance data can be guaranteed. Therefore, the preset range of sunlight intensity in this application means that the intensity value of sunlight required for the test needs to be within the error range of the standard value, that is, 1000W / m 2 within the error range.

[0049] The detection device provided in the present application includes a plurality of reflectors 1, a focusing device 2, a sensing device 3 and a control unit 4, wherein the sensing device 3 can collect the intensity value of the sunlight transmitted to the photovoltaic module, and the control unit 4 adjusts the number of reflectors 1 used and the rotation angle of the polarizer 22 in the focusing device 2 according to the collected intensity value, thereby ensuring that the intensity value of the sunlight transmitted to the photovoltaic module can be maintained within the preset range of the electrical performance test. Specifically, Figure 1 As shown in the figure, the direction indicated by the arrow in the figure represents the direction of sunlight transmission. The reflector 1 transmits the reflected sunlight to the focusing device 2. In this process, the intensity of light transmitted to the focusing device 2 can be changed by adjusting the number of reflectors 1 used. Figure 2 As shown, the direction indicated by the arrow in the figure indicates the direction of sunlight transmission, and the number of arrows indicates the change of sunlight intensity. The light reflected by the reflector will first be transmitted to the diffuser 21 of the focusing device 2, and then under the action of the diffuser 21, the light transmitted to the polarizer 22 is in a scattered state, thereby ensuring that the sunlight transmitted to the constant temperature chamber 23 has a high uniformity and the accuracy of the electrical performance data obtained by the detection. Since one polarizer 22 can rotate relative to another polarizer 22, when the sunlight in the scattered state is transmitted to the polarizer 22, the rotation angle of the polarizer 22 is adjusted to reduce the intensity of the sunlight in the scattered state. In other words, the intensity of sunlight can be greatly changed by changing the number of reflectors used, and the intensity of sunlight can be accurately fine-tuned by adjusting the rotation angle of the polarizer 22, thereby ensuring that the intensity of sunlight reaching the photovoltaic module remains within a preset range, which can be applied to sunlight in different weather conditions, improve the utilization rate of sunlight, reduce the production cost, and ensure that the measured electrical performance data has a high accuracy. In addition, the detection device of the present application has a simple structure, which greatly reduces the cost of its installation, maintenance and operation, improves production efficiency, and the control method is simple, which reduces the difficulty of detection, improves the applicability of detection, and can carry out large-scale detection.

[0050] It should be noted that the intensity of the sunlight transmitted to the concentrating device 2 must be greater than the preset range of the intensity of the sunlight during the test. When the intensity of the sunlight irradiated to the reflector 1 is weak, the number of reflectors 1 used is increased, thereby increasing the intensity of the sunlight reflected from the reflector 1 to the concentrating device 2; when the intensity of the sunlight irradiated to the reflector 1 is high, the number of reflectors 1 used is reduced, thereby reducing the intensity of the sunlight reflected from the reflector 1 to the concentrating device 2. That is, by controlling the number of reflectors 1 used, the intensity value of the sunlight transmitted to the concentrating device 2 can be reasonably controlled, ensuring that the intensity of the sunlight transmitted to the concentrating device 2 is greater than the preset range during the electrical performance test.

[0051] In addition, the light-absorbing material is used in the focusing device 2, thereby reducing the loss of sunlight in the focusing device 2, so that the light transmitted to the focusing device 2 fully acts on the photovoltaic module, and the utilization rate of light is improved; the diffuser 21 can be made of conventional frosted glass, frosted glass and other non-smooth flat glass, and the higher the surface roughness, the better the light scattering effect, so that the light transmitted to the photovoltaic module has a higher uniformity, thereby reducing the detection error; the polarizer 22 can use conventional optical polarizing glass, and when light passes through a polarizer 22, the intensity of the light is directly The intensity of the light passing through the polarizer 22 can be reduced to 50% of the original intensity. If two polarizers 22 are provided and the rotation angle of the polarizer 22 is changed, the intensity of the light passing through the polarizer 22 can be changed to 50%×K of the original intensity, wherein the magnitude of K is related to the rotation angle of the polarizer, indicating the proportion of the reduction of the original intensity of light. By adjusting the rotation angle, the value of K satisfies: 0≤K≤1, thereby achieving the fine adjustment effect of light. When the number of reflectors 1 is N, the intensity of sunlight reflected by one reflector 1 is G, and the intensity of sunlight finally reaching the photovoltaic module is N×G×50%×K. That is, by reasonably adjusting the number of reflectors 1 used and the rotation angle of the polarizer 22, the intensity of sunlight reaching the photovoltaic module can be kept within the preset range.

[0052] Further, the detection device further includes a first drive assembly 6, which is electrically connected to the control unit 4, and the first drive assembly 6 is connected to the polarizer 22, and is used to drive the polarizer 22 to rotate. It can be understood that when the sensing device 3 transmits the intensity value of the collected sunlight to the control system, the control system controls the first drive assembly 6 at this time, and under the drive of the first drive assembly 6, the polarizer 22 rotates, thereby changing the rotation angle of the two polarizers 22, so that the intensity of the sunlight finally reaching the constant temperature chamber 23 is maintained within a preset range.

[0053] In an optional embodiment, if Figure 3 and Figure 4As shown, the focusing device 2 also includes a housing 5, a diffuser 21, a polarizer 22 and a constant temperature chamber 23 are arranged in the housing 5, the diffuser 21 is fixedly connected to the housing 5, and at least one polarizer 22 is rotatably connected to the housing 5; the first driving assembly 6 includes a driving member 61 arranged on the polarizer 22, a gear 62 arranged at the driving end of the driving member 61, and a tooth structure 51 arranged around the inner wall of the housing 5, and the gear 62 is meshed with the tooth structure 51. In another optional embodiment, the first driving assembly 6 includes a driving member 61 arranged on the inner wall of the housing 5, a gear 62 arranged at the driving end of the driving member 61, and a tooth structure 51 arranged around the outer surface of the polarizer, and the gear 62 is meshed with the tooth structure 51.

[0054] In an optional embodiment, if Figure 2 and Figure 5 As shown, the polarizer 22 includes a first polarizer 221 and a second polarizer 222, the first polarizer 221 can rotate relative to the second polarizer 222, the first polarizer 221 includes a first frame 2211 and a lens disposed in the first frame 2211, and a roller 7 is disposed on the lower surface of the first frame 2211; the second polarizer 222 includes a second frame 2221 and a lens disposed in the second frame 2221, and the upper surface of the second frame is used to support the roller 7. When the roller 7 is disposed on the lower surface of the first frame 2211, the friction force when the first frame 2211 rotates relative to the second frame 2221 can be reduced, the wear degree of the polarizer 22 is reduced, the service life thereof is increased, and the cost of repair or replacement is reduced.

[0055] In another optional embodiment, the first polarizer 221 is located between the second polarizer 222 and the constant temperature chamber 23, the constant temperature chamber 23 includes a chamber wall, the lower surface of the first polarizer 221 is provided with a roller 7, and the chamber wall of the constant temperature chamber 23 is used to support the roller 7. When the roller 7 is provided on the lower surface of the first mirror frame 2211, the friction force when the first mirror frame 2211 rotates relative to the constant temperature chamber 23 can be reduced, the wear degree of the polarizer 22 is reduced, the service life thereof is increased, and the cost of repair or replacement is reduced.

[0056] Furthermore, if Figure 5 and Figure 6As shown, the first mirror frame 2211 and the second mirror frame 2221 are arranged at intervals, the lower surface of the first mirror frame 2211 is provided with a first receiving groove 2211a, the upper surface of the second mirror frame 2221 is provided with a second receiving groove 2221a, and the roller 7 is arranged between the first receiving groove 2211a and the second receiving groove 2221a. In this embodiment, the roller 7 can act as a connecting member to connect the first polarizer 221 and the second polarizer 222, and when the first polarizer 221 rotates, the roller 7 rolls in the second receiving groove, thereby realizing the rotation of the first polarizer 221 relative to the second polarizer 222, and can effectively reduce the friction force when the first polarizer 221 rotates relative to the second polarizer 222.

[0057] Furthermore, the constant temperature chamber 23 is connected to a temperature control device, which is used to keep the temperature of the constant temperature chamber 23 within a preset range. The temperature control device is used to control the temperature of the constant temperature chamber 23, so that the temperature acting on the photovoltaic module is constant, ensuring the accuracy of the detection data.

[0058] Among them, when conducting electrical performance tests on photovoltaic modules, the temperature of sunlight on the photovoltaic modules needs to be kept within the error range of the standard value, and the standard value is 25°C. Only when the temperature reaches the test standard can the accuracy of the measured electrical performance data be guaranteed. Therefore, the temperature of the constant temperature chamber 23 of the present application is within the preset range, which means that the temperature required for the test is within the error range of the standard value, specifically within the error range of 25°C.

[0059] Furthermore, the temperature control device includes an air conditioner 8 and a temperature detection element, the temperature detection element is electrically connected to the air conditioner 8, and the temperature detection element is used to detect the temperature of the constant temperature chamber 23. Figure 7 As shown, the air conditioner 8 includes an air inlet duct 81, an air outlet duct 82 and a main unit 83. The air inlet duct 81 and the air outlet duct 82 are respectively connected to the main unit 83, and the constant temperature chamber 23 is provided with an air inlet matching the air inlet duct 81, and is also provided with an air outlet matching the air outlet duct 82. The air inlet duct 81 sucks the air in the constant temperature chamber 23, sends it to the main unit 83 for processing, and then transports the processed air to the air outlet duct, thereby transporting it to the constant temperature chamber 23 through the air outlet duct, thereby keeping the temperature of the constant temperature chamber 23 constant.

[0060] Furthermore, if Figure 7 As shown, a bracket 231 is provided in the constant temperature chamber 23, and the bracket 231 is used to place the photovoltaic module. Compared with placing the photovoltaic module directly on the bottom plate of the constant temperature chamber 23, placing the photovoltaic module on the bracket 231 reduces the probability of friction between the bracket 231 and the photovoltaic module during the transfer process, reduces the degree of damage to the surface of the photovoltaic module, and helps to improve the appearance yield of the photovoltaic module.

[0061] Furthermore, the detection device further includes a second drive assembly, which is connected to the plurality of reflectors 1 respectively, and can drive the plurality of reflectors 1 to rotate respectively, and the second drive assembly is electrically connected to the control unit 4. It can be understood that when the sensing device 3 transmits the intensity value of the collected sunlight to the control unit 4, the control unit 4 controls the second drive assembly at this time, and the reflector 1 rotates under the drive of the second drive assembly, and when the reflective surface of the reflector 1 faces the sunlight, the reflector 1 is in use at this time, that is, by adjusting the position of the reflective surface relative to the sunlight, the number of reflectors 1 in use is controlled.

[0062] Furthermore, a sun tracking device 9 is connected to the reflector 1, and the sun tracking device 9 is used to drive the reflector 1 to track the trajectory of the sun. Since the reflector 1 can track the trajectory of the sun, that is, the reflective surface of the reflector 1 is used to face the direction of higher intensity of sunlight, the intensity of sunlight reflected by the reflector 1 is increased, and the utilization rate of sunlight can be improved.

[0063] Furthermore, the solar tracking device 9 is a dual-axis tracking system that tracks changes in the azimuth and altitude of the sun, thereby tracking the sun's trajectory, so that the reflective surface of the reflector 1 is always facing the direction of the highest intensity of sunlight, thereby improving the utilization rate of sunlight.

[0064] Furthermore, the area of ​​any reflective element 1 is larger than the area of ​​the diffuser 21. The larger the area, the higher the uniformity of the light reflected from the reflective element 1 to the diffuser 21, which helps the diffuser 21 to scatter the light and ensures that the light that ultimately acts on the photovoltaic module has higher uniformity.

[0065] The above is a detailed introduction to an electrical performance detection device for a photovoltaic module disclosed in an embodiment of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand an electrical performance detection device for a photovoltaic module. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A photovoltaic module electrical performance detection device, characterized in that: The detection device comprises: A plurality of reflective elements, when sunlight irradiates the reflective elements, any of the reflective elements is used to reflect the sunlight; A light concentrator, the light concentrator comprising, from top to bottom, a light diffuser, at least two polarizers, and a constant temperature chamber, the light diffuser being used to receive the sunlight reflected by the reflector and causing the sunlight transmitted to the polarizer to be in a scattered state, at least one of the polarizers being able to rotate relative to another polarizer to reduce the intensity of the sunlight in a scattered state, and the constant temperature chamber being used to place the photovoltaic module; A sensing device, the sensing device is used to collect the intensity value of the sunlight in the constant temperature chamber; A control unit, wherein the control unit is electrically connected to the sensing device, the reflective element and the focusing device, and the control unit is used to adjust the number of the reflective elements used and the rotation angle of the polarizing element so that the intensity of the sunlight transmitted to the constant temperature chamber is maintained within a preset range.

2. The detection device according to claim 1, characterized in that: The detection device further includes a first driving component, the first driving component is electrically connected to the control unit, and the first driving component is connected to the polarizer to drive the polarizer to rotate.

3. The detection device according to claim 2, characterized in that: The light focusing device further comprises a housing, the light diffuser, the polarizer and the constant temperature chamber are arranged in the housing, the light diffuser is fixedly connected to the housing, and at least one of the polarizers is rotatably connected to the housing; The first driving assembly includes a driving member disposed on the polarizing member, a gear disposed on a driving end of the driving member, and a tooth structure disposed around the inner wall of the housing, and the gear is meshed with the tooth structure.

4. The detection device according to claim 1, characterized in that: The polarizer includes a first polarizer and a second polarizer, the first polarizer can rotate relative to the second polarizer, the first polarizer includes a first frame and a lens arranged in the first frame, and a roller is arranged on the lower surface of the first frame; The second polarizer includes a second frame and a lens arranged in the second frame, and the upper surface of the second frame is used to support the roller.

5. The detection device according to claim 4, characterized in that: The first mirror frame and the second mirror frame are arranged at intervals, a first receiving groove is provided on the lower surface of the first mirror frame, a second receiving groove is provided on the upper surface of the second mirror frame, and the roller is arranged between the first receiving groove and the second receiving groove.

6. The detection device according to claim 1, characterized in that: The constant temperature chamber is connected to a temperature control device, and the temperature control device is used to keep the temperature of the constant temperature chamber within a preset range.

7. The detection device according to claim 6, characterized in that: The temperature control device comprises an air conditioner and a temperature detection element, wherein the temperature detection element is electrically connected to the air conditioner and is used to detect the temperature of the constant temperature chamber.

8. The detection device according to claim 1, characterized in that: The detection device further comprises a second driving assembly, wherein the second driving assembly is connected to the plurality of reflective elements respectively and can drive the plurality of reflective elements to rotate respectively, and the second driving assembly is electrically connected to the control unit.

9. The detection device according to claim 1, characterized in that: The reflective element is connected to a sun tracking device, and the sun tracking device is used to drive the reflective element to track the movement trajectory of the sun.

10. The detection device according to any one of claims 1 to 9, characterized in that: The area of ​​any one of the reflective elements is larger than the area of ​​the light scattering element.

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