Device for measuring working temperature of photovoltaic module

Abstract

The utility model relates to a working temperature measuring device of a photovoltaic module. The working temperature measuring device comprises a heat-conducting medium material, a first temperature probe, a second temperature probe and a controller, in the actual temperature measurement process, the first temperature is detected through the first temperature probe, the second temperature is detected through the second temperature probe, the controller can calculate the heat flux density in the back panel and the back adhesive film material according to the first temperature and the second temperature by using the heat conduction law, and then the working temperature of the photovoltaic module is calculated. Therefore, the working temperature of the photovoltaic module is indirectly measured by adopting the heat transfer model theory, the actual working temperature of the battery piece in the photovoltaic module can be measured, the measurement precision is improved, meanwhile, the working temperature is obtained in an indirect measurement mode, the operation is simple, and the cost is low. The sealing performance and the reliability of the photovoltaic module are not affected as the back panel needs to be punctured to be contacted with the battery piece in the related technology, and the photovoltaic module has better sealing line and reliability.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic modules, and in particular to a device for measuring the working temperature of a photovoltaic module. Background Art

[0002] Photovoltaic power generation is a power generation technology that uses the photovoltaic effect of semiconductor interfaces to directly convert solar energy into electrical energy. Photovoltaic modules are made by connecting a number of single solar cells in series and parallel and tightly sealing them. They are the smallest indivisible photovoltaic cell combination device to achieve photovoltaic power generation. Photovoltaic modules include single-glass modules and double-glass modules. Single-glass modules generally adopt a sandwich structure of "glass / film / cell / film / backboard", while double-glass modules adopt a sandwich structure of "glass / film / cell / film / glass". The operating temperature of a photovoltaic module actually refers to the operating temperature of the cells in the photovoltaic module. The operating temperature detection of outdoor photovoltaic modules, as one of the key links in the outdoor performance measurement of photovoltaic modules, is of great significance for in-depth analysis of the causes of module failures and accurate evaluation of power generation gains.

[0003] In the related technologies, there are two main methods for measuring the working temperature of photovoltaic modules in the industry:

[0004] (1) Directly sticking thermocouples to the back of PV modules or using infrared thermal imagers to measure the temperature of PV modules is inaccurate because this method can only measure the back temperature of PV modules, that is, the back panel temperature of single-glass modules or the back glass temperature of double-glass modules, but not the actual temperature of the cells inside the PV modules.

[0005] (2) The thermocouple is directly attached to the cell attachment and laminated to the inside of the photovoltaic module, and then the lead wire is used for measurement. Although this method can measure the actual temperature of the internal cells of the photovoltaic module, it will affect the sealing of the photovoltaic module and significantly increase the reliability risk of the photovoltaic module. Summary of the invention

[0006] Based on this, it is necessary to overcome the defects of the prior art and provide a working temperature measurement device for a photovoltaic module, which can measure the actual working temperature of the battery cells inside the photovoltaic module without affecting the sealing and reliability of the photovoltaic module.

[0007] A device for measuring the working temperature of a photovoltaic module, the device comprising:

[0008] A heat-conducting medium material, wherein the heat-conducting medium material is used to be bonded to the back panel of the photovoltaic module;

[0009] A first temperature probe, the first temperature probe is used to detect a first temperature T1 of a side of the heat-conducting medium material away from the photovoltaic module;

[0010] A second temperature probe for detecting a second temperature T2 on the side of the heat-conducting medium material facing the photovoltaic module; and

[0011] A controller electrically connected to the first temperature probe and the second temperature probe respectively, and the controller is used to obtain the working temperature T4 of the battery cells inside the photovoltaic module according to the first temperature T1 and the second temperature T2.

[0012] In one embodiment, the working temperature measuring device of the photovoltaic module further includes a fixing structure; the fixing structure is used to make the heat-conducting medium material adhere to the back panel of the photovoltaic module; the fixing structure is also connected to the controller, the first temperature probe, and the second temperature probe respectively.

[0013] In one embodiment, the fixing structure is arranged on the outer periphery of the heat-conducting medium material; the fixing structure is arranged in a hollow structure.

[0014] In one embodiment, the fixing structure includes at least one fixing column and a connecting member correspondingly arranged at one end of the fixing column; the connecting member is connected to the heat-conducting medium material, and the other end of the fixing column is connected to the controller.

[0015] In one embodiment, both the fixing column and the connecting member are provided in multiple numbers, each connecting member is correspondingly arranged on each fixing column, and each connecting member is correspondingly connected to each corner of the heat-conducting medium material.

[0016] In one embodiment, the working temperature measuring device of the photovoltaic module further includes at least one elastic member, and one side of the heat-conducting medium material facing away from the back panel is connected to the fixing structure through the elastic member, and when the heat-conducting medium material is not adhered to the back panel, at least part of the heat-conducting medium material protrudes from the side of the fixing structure facing the back panel.

[0017] In one embodiment, the fixing structure is provided with at least one suction cup, and the suction cup is adsorbed and fixed on the back panel.

[0018] In one embodiment, the heat-conducting medium material is a plate member with uniform thickness.

[0019] In one embodiment, the plate thickness of the heat-conducting medium material is 2 mm to 8 mm.

[0020] In one embodiment, the controller is provided with a display screen for displaying the working temperature T4, and at least one button capable of inputting test parameters.

[0021] In the actual temperature measurement process of the above-mentioned working temperature measurement device for a photovoltaic module, the first temperature T1 is detected by the first temperature probe, and the second temperature T2 is detected by the second temperature probe. According to the first temperature T1 and the second temperature T2, and by using the heat conduction law, the controller can calculate the heat flux density in the back panel and the back adhesive film material, and then calculate the working temperature T4 of the photovoltaic module. It can be seen that by using the heat transfer model theory to indirectly measure the working temperature of the photovoltaic module, the actual working temperature of the solar cells inside the photovoltaic module can be measured, the measurement accuracy is improved. At the same time, the working temperature T4 is obtained by an indirect measurement method, the operation is simple, and it will not affect the sealing performance and reliability of the photovoltaic module like in the related art where it is necessary to puncture the back panel to contact the solar cells. It has good sealing performance and reliability. Description of the Drawings

[0022] Figure 1 It is a simplified schematic diagram of the measurement of the working temperature of a photovoltaic module according to an embodiment of the present application.

[0023] Figure 2 It is a structural diagram of the working temperature measurement device for a photovoltaic module according to an embodiment of the present application.

[0024] Figure 3 is Figure 2 Another perspective structural diagram of the shown structure.

[0025] Figure 4 is Figure 2 Another perspective structural diagram of the shown structure.

[0026] Figure 5 It is a simplified diagram of the working temperature measurement device for a photovoltaic module according to an embodiment of the present application.

[0027] 10. Heat-conducting medium material; 20. First temperature probe; 30. Second temperature probe; 40. Controller; 41. Temperature acquisition module; 42. Data storage module; 43. Data processing module; 44. Display module; 45. Display screen; 46. Button; 50. Photovoltaic module; 51. Back panel; 52. Back adhesive film; 60. Fixing structure; 61. Fixing column; 62. Connecting piece; 63. Suction cup; 70. Elastic member. Detailed Embodiments

[0028] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0029] It should be noted that the front side in this embodiment refers to the side of the photovoltaic module that receives light during operation, that is, the side facing the sun during operation; the back side refers to the side of the photovoltaic module that is disposed opposite to the front side, that is, the side facing away from the sun during operation. In addition, for a single-glass module, the back panel in this embodiment also refers to the backsheet of the photovoltaic module; for a double-glass module, the back panel in this embodiment refers to the glass of the photovoltaic module that faces away from the sun during operation. Additionally, the back adhesive film in this embodiment refers to the adhesive film located between the back panel and the cell.

[0030] The operating temperature of the photovoltaic module actually refers to the operating temperature of the cells inside the photovoltaic module. When the photovoltaic module operates outdoors and the external environmental irradiance, temperature, and wind speed are stable, the operating temperature of the cells inside the photovoltaic module is stable and can be considered a constant value. Since the temperature of the photovoltaic module is higher than the ambient temperature during operation, and there is only conductive heat transfer between the cells and the back adhesive film, and between the back adhesive film and the back panel, the heat transfer on the back side of the photovoltaic module can be described using the steady-state heat transfer theory.

[0031] Please refer to Figure 1 , Figure 1 which shows a simplified schematic diagram of the measurement of the operating temperature of the photovoltaic module 50 according to an embodiment of the present application. Figure 1 The photovoltaic module 50 in [[ ]] only shows the components associated with the operating temperature, that is, the back panel 51 and the back adhesive film 52, and the rest of the structure of the photovoltaic module 50 is not shown; in addition, Figure 1 also shows the heat-conducting medium material 10 that is attached to the back panel 51. Additionally, Figure 1T1 in the figure represents the first temperature of the side of the heat-conducting medium material 10 facing away from the photovoltaic module 50, T2 represents the second temperature of the side of the heat-conducting medium material 10 facing the photovoltaic module 50, T3 represents the third temperature at the contact surface between the back adhesive film 52 and the back panel 51, and T4 represents the temperature at the contact surface between the back adhesive film 52 and the cell, that is, the working temperature of the cell. For each photovoltaic module 50, the thermal conductivity coefficient λ3 and thickness d3 of the back adhesive film 52 material, the thermal conductivity coefficient λ2 and thickness d2 of the back panel 51 material are all known. In addition, the thermal conductivity coefficient λ1 and thickness d1 of the heat-conducting medium material 10 are also known. Therefore, during the working temperature test of the photovoltaic module 50, when the first temperature T1 at the contact surface of the heat-conducting medium material 10 and the ambient air is obtained by the first temperature probe 20, and the second temperature T2 at the contact surface of the heat-conducting medium material 10 and the back panel 51 is obtained by the second temperature probe 30, the working temperature of the photovoltaic module 50 can be indirectly tested. Specifically, combined with the steady-state heat transfer model of the back side of the photovoltaic module 50, there is only conduction heat transfer between the cell and the back side film 52, there is only conduction heat transfer between the back side film 52 and the back panel 51, and there is only conduction heat transfer between the back panel 51 and the thermal conductive medium material 10. Therefore, the heat flux density in the thermal conductive medium material 10 is the same as the heat flux density in the back panel 51 and the film material. Here, the heat flux density is uniformly represented by q. Formula (1) is the law of heat conduction, also known as Fourier's heat transfer law, where λ is the thermal conductivity coefficient of the material, dt is the temperature difference between the two sides of the material, and dx is the thickness of the material. Based on the existing data and combined with the law of heat conduction, the operating temperature T4 of the photovoltaic module 50 can be calculated, as shown in formula (3). It should be emphasized that the following formula is not fixed and can also be adaptively modified according to changes in actual conditions. The following theoretical formula mainly explains the design ideas of the photovoltaic module 50 test device. Other similar design ideas and test methods developed based on this similar theoretical model are within the scope of protection of this patent.

[0032] (1)

[0033] (2)

[0034] (3)

[0035] In some embodiments, during the photovoltaic module 50 operating temperature test:

[0036] Step 1: Input the thermal conductivity coefficient λ3 and thickness d3 of the back adhesive film 52 of the photovoltaic module 50 to be tested, the thermal conductivity coefficient λ2 and thickness d2 of the back panel 51 material, and the thermal conductivity coefficient λ1 and thickness d1 of the heat-conducting medium material 10 into the controller 40;

[0037] Step 2: Select a state where the external environment is stable (irradiance, temperature, and wind speed are stable);

[0038] Step 3: The thermal conductive medium material 10 is attached to the back panel 51 of the photovoltaic module 50;

[0039] Step 4: respectively collecting a first temperature T1 at the contact surface between the heat-conducting medium material 10 and the ambient air and a second temperature T2 at the contact surface between the heat-conducting medium material 10 and the back panel 51;

[0040] Step 5: Based on the first temperature T1 and the second temperature T2, the operating temperature T4 of the photovoltaic module 50 can be calculated by using the back surface temperature heat transfer model of the photovoltaic module 50;

[0041] Step 6: The calculated working temperature T4 of the photovoltaic module 50 is displayed on the display screen 45, and the working temperature measurement of the photovoltaic module 50 is completed.

[0042] See also Figures 1 to 5 , Figures 2 to 4 Three structural diagrams from different perspectives of the working temperature measurement device of the photovoltaic module 50 in one embodiment of the present application are respectively shown, Figure 5 A simplified diagram of a working temperature measuring device of a photovoltaic module 50 according to an embodiment of the present application is shown. An embodiment of the present application provides a working temperature measuring device of a photovoltaic module 50, and the working temperature measuring device of the photovoltaic module 50 includes: a heat-conducting medium material 10, a first temperature probe 20, a second temperature probe 30, and a controller 40. The heat-conducting medium material 10 is used to be attached to the back panel 51 of the photovoltaic module 50. The first temperature probe 20 is used to detect a first temperature T1 of the side of the heat-conducting medium material 10 away from the photovoltaic module 50. The second temperature probe 30 is used to detect a second temperature T2 of the side of the heat-conducting medium material 10 facing the photovoltaic module 50. The controller 40 is electrically connected to the first temperature probe 20 and the second temperature probe 30, respectively, and the controller 40 is used to obtain the working temperature T4 of the battery cell inside the photovoltaic module 50 according to the first temperature T1 and the second temperature T2.

[0043] For the working temperature measuring device of the above photovoltaic module 50, during the actual temperature measurement process, the first temperature probe 20 detects the first temperature T1, and the second temperature probe 30 detects the second temperature T2. The controller 40 can calculate the heat flux density in the back panel 51 and the back adhesive film 52 materials based on the first temperature T1 and the second temperature T2 and by using the heat conduction law, and then calculate the working temperature T4 of the photovoltaic module 50. Thus, by using the heat transfer model theory to indirectly measure the working temperature of the photovoltaic module 50, the actual working temperature of the solar cells inside the photovoltaic module 50 can be measured, the measurement accuracy is improved, and at the same time, the working temperature T4 is obtained by an indirect measurement method, the operation is simple, and it will not affect the sealing performance and reliability of the photovoltaic module 50 as in the related art due to piercing the back panel 51 to contact the solar cells, and it has good sealing performance and reliability.

[0044] In some embodiments, the first temperature probe 20 includes but is not limited to contacting the side of the heat-conducting medium material 10 facing away from the photovoltaic module 50, so as to detect the first temperature T1 of the side of the heat-conducting medium material 10 facing away from the photovoltaic module 50. Specifically, the side of the heat-conducting medium material 10 facing away from the photovoltaic module 50 is not in contact with other components and is in a bare state, that is, it is located in the ambient air and in contact with the ambient air. Optionally, the first temperature probe 20 is fixed on the side of the heat-conducting medium material 10 facing away from the photovoltaic module 50, so as to accurately detect the first temperature T1. As some examples, the first temperature probe 20 is selected, for example, a thermocouple with a very small diameter or other temperature-measuring material structures such as thermocouples and thermistors. For example, a temperature detection needle with a diameter including but not limited to 0.01 mm to 0.5 mm is used. After being fixedly installed on the side of the heat-conducting medium material 10 facing away from the photovoltaic module 50, the heat flux density will not be affected due to the small diameter size. Of course, in some other embodiments, the first temperature probe 20 can also sense the first temperature T1 in a non-contact manner.

[0045] In some embodiments, the second temperature probe 30 includes but is not limited to contacting the side of the heat-conducting medium material 10 facing the photovoltaic module 50, so as to detect the second temperature T2 of the side of the heat-conducting medium material 10 facing the photovoltaic module 50. Specifically, the second temperature probe 30 is embedded in the contact surface of the heat-conducting medium material 10 with the back panel 51, so as to accurately detect the second temperature T2. Optionally, the second temperature probe 30 is selected, for example, a thermocouple with a very small diameter or other temperature-measuring material structures such as thermocouples and thermistors. For example, a temperature detection needle with a diameter including but not limited to 0.01 mm to 0.5 mm is used to ensure that the heat flux density will not be affected. Of course, in some other embodiments, the second temperature probe 30 can also sense the first temperature T1 in a non-contact manner.

[0046] Please refer to Figure 2 and Figure 5 In some embodiments, the controller 40 includes a temperature acquisition module 41, a data storage module 42, a data processing module 43, and a display module 44. The temperature acquisition module 41 is connected to the data storage module 42, the data storage module 42 is connected to the data processing module 43, and the data processing module 43 is connected to the display module 44. Specifically, the temperature acquisition module 41 is configured to acquire the first temperature T1 sensed by the first temperature probe 20 and obtain the second temperature T2 sensed by the second temperature probe 30. The data storage module 42 is used to store the thermal conductivity coefficient λ3 and thickness d3 of the back adhesive film 52 material, the thermal conductivity coefficient λ2 and thickness d2 of the back panel 51 material, the thermal conductivity coefficient λ1 and thickness d1 of the heat-conducting medium material 10, the first temperature T1, and the second temperature T2. The data processing module 43 is configured to process the data in the storage module and obtain the operating temperature T4. The display module 44 is used to display the operating temperature T4.

[0047] Please refer to Figures 2 to 5 In some embodiments, the controller 40 is provided with a display screen 45. The display module 44 is specifically integrated in the display screen 45. Thus, the operating temperature T4 of the photovoltaic module 50 is displayed through the display screen 45. Among them, the display screen 45 can be either a display screen 45 with touch function or a display screen 45 without touch function, which can be specifically set according to actual needs. As a specific example, the display screen 45 in this embodiment is, for example, a display screen 45 without touch function, and one or more buttons 46 are also provided on the controller 40 for inputting necessary test parameters, including the thermal conductivity coefficient λ3 and thickness d3 of the back adhesive film 52 material, the thermal conductivity coefficient λ2 and thickness d2 of the back panel 51 material, the thermal conductivity coefficient λ1 and thickness d1 of the heat-conducting medium material 10, etc.

[0048] In one embodiment, the operating temperature measuring device of the photovoltaic module 50 further includes a fixing structure 60. The fixing structure 60 is used to make the heat-conducting medium material 10 adhere to the back panel 51 of the photovoltaic module 50. The fixing structure 60 is also connected to the controller 40, the first temperature probe 20, and the second temperature probe 30 respectively.

[0049] In order to make the environments of the surfaces of the heat-conducting medium material 10 that are not in contact with the back panel 51 the same as the environment of the back surface of the back panel 51, the contact area between the fixing structure 60 and the heat-conducting medium material 10 is minimized, that is, the contact area of the fixing structure 60 on the heat-conducting medium material 10 is reduced as much as possible, and at the same time, as long as the fixing function of the heat-conducting medium material 10 on the back panel 51 is satisfied. As an example, the fixing structure 60 is provided, for example, on the outer periphery of the heat-conducting medium material 10 and is connected to one or more places on the outer periphery of the medium material. The fixing structure 60 can also be provided in a hollow structure, so as to reduce the contact area in contact with the heat-conducting medium material 10. When the contact area between the fixing structure 60 and the heat-conducting medium material 10 is small, more surfaces of the heat-conducting medium material 10 that are not in contact with the back panel 51 are in an exposed state and are in full contact with the ambient air, which is beneficial to making the environments of the surfaces of the heat-conducting medium material 10 that are not in contact with the back panel 51 the same as the environment of the back surface of the back panel 51, thereby improving the measurement accuracy of the working temperature T4.

[0050] In a specific embodiment, the fixing structure 60 is provided on the outer periphery of the heat-conducting medium material 10. The fixing structure 60 is provided in a hollow structure. In this way, on the one hand, it plays a fixing role on the heat-conducting medium material 10, making the heat-conducting medium material 10 fit on the back panel 51; on the other hand, it can reduce the contact area in contact with the heat-conducting medium material 10, which is beneficial to the heat-conducting medium material 10 being in full contact with the ambient air.

[0051] In an embodiment, the fixing structure 60 includes at least one fixing post 61 and a connecting member 62 correspondingly provided at one end of the fixing post 61. The connecting member 62 is connected to the heat-conducting medium material 10, and the other end of the fixing post 61 is connected to the controller 40. In this way, by adopting the structural form of the fixing post 61, the contact area in contact with the heat-conducting medium material 10 can be reduced, and the controller 40 can be kept away from the heat-conducting medium material 10, forming an air circulation interval between the controller 40 and the heat-conducting medium material 10, which is beneficial to the heat-conducting medium material 10 being in full contact with the ambient air.

[0052] In some embodiments, the connecting member 62 includes, but is not limited to, a clamping member. The connecting member 62 is connected to the heat-conducting medium material 10 by clamping, which is convenient for disassembling and assembling the heat-conducting medium material 10. In addition, the connecting member 62 can also be set as other various fasteners such as bolts, pins, rivets, etc., which are not limited herein.

[0053] In an embodiment, both the fixing post 61 and the connecting member 62 are provided in multiple numbers. Each connecting member 62 is correspondingly provided on each fixing post 61, and each connecting member 62 is correspondingly connected to each corner of the heat-conducting medium material 10.

[0054] Specifically, when the heat-conducting medium material 10 is set to be rectangular, both the fixing columns 61 and the connecting members 62 are set to be four. Each fixing column 61 is correspondingly arranged with each corner of the heat-conducting medium material 10, so that each connecting member 62 is correspondingly connected to each corner of the heat-conducting medium material 10. In this way, the heat-conducting medium material 10 can be stably attached to the back panel 51, preventing any corner of the heat-conducting medium material 10 from warping and causing a reduction in the detection accuracy of the working temperature T4.

[0055] Of course, the heat-conducting medium material 10 is not limited to being rectangular, and can also be set to regular shapes such as triangles, pentagons, circles or ellipses, as well as other irregular shapes, which can be specifically selected according to actual needs. The number of the fixing columns 61 is adjusted and set accordingly according to the number of corners of the heat-conducting medium material 10, which is not limited herein.

[0056] In one embodiment, the working temperature measuring device of the photovoltaic module 50 further includes at least one elastic member 70. One side of the heat-conducting medium material 10 facing away from the back panel 51 is connected to the fixing structure 60 through the elastic member 70, and when the heat-conducting medium material 10 is not attached to the back panel 51, at least part of the material of the heat-conducting medium material 10 protrudes from one side of the fixing structure 60 facing the back panel 51. In this way, during the process of attaching the working temperature measuring device of the photovoltaic module 50 to the back panel 51, the elastic member 70 is compressed to play a buffering role, preventing damage caused by hard contact of the heat-conducting medium material 10; in addition, under the elastic force of the elastic member 70, the heat-conducting medium material 10 can be well attached to the back panel 51.

[0057] In some embodiments, the elastic member 70 includes, but is not limited to, springs, elastic blocks, elastic strips, etc.

[0058] In some embodiments, the elastic member 70 includes, but is not limited to, a plurality of elastic members. A plurality of parts of the heat-conducting medium material 10 are elastically abutted against the fixing structure 60 through a plurality of elastic members 70 respectively. Specifically, each elastic member 70 is arranged at equal intervals around the outer periphery of the heat-conducting medium material 10. In this way, each part of the heat-conducting medium material 10 is evenly stressed and has high stability.

[0059] In some embodiments, the fixing structure 60 can be fixedly connected to the back panel 51, and the fixing connection methods include, but are not limited to, adsorption fixing, bonding fixing, snap connection fixing, etc. In this way, while the fixing structure 60 is installed on the back panel 51, the heat-conducting medium material 10 can be attached to the back panel 51.

[0060] In a specific embodiment, the fixing structure 60 is provided with at least one suction cup 63. The suction cup 63 is adsorbed and fixed on the back panel 51. Specifically, each fixing post 61 is provided with a suction cup 63, and each fixing post 61 is adsorbed and fixed on the back panel 51 through the suction cup 63. In this way, not only can the heat-conducting medium material 10 be closely attached to the back panel 51, but also it is convenient for the fixing structure 60 to be fixedly installed on the back panel 51. After the working temperature of the photovoltaic module 50 is measured, it is also convenient to disassemble the working temperature measuring device of the photovoltaic module 50 from the photovoltaic module 50. Of course, it should be noted that the fixing structure 60 is not limited to being fixed on the back panel 51 through the suction cup 63, and it can also be fixedly installed on the back panel 51 through other installation methods.

[0061] In some embodiments, the heat-conducting medium material 10 can either be a plate with a uniform thickness, which is beneficial to simplifying the heat conduction model and improving the measurement accuracy of the working temperature; or it can be a plate with a non-uniform thickness. The heat-conducting medium material 10 is a part of the working temperature measuring device of the photovoltaic module 50. During the temperature test of the photovoltaic module 50, one side of the heat-conducting medium material 10 is closely attached to the back panel 51, and the other sides are in contact with the ambient air. The purpose is to create conditions for calculating the heat flux density under the steady-state heat transfer model on the back of the photovoltaic module 50 and improve the measurement accuracy of the working temperature. Optionally, the heat-conducting medium material 10 can be selected from copper, stainless steel, etc., and its shape can be rectangular or other shapes, which are not limited herein.

[0062] Among them, in order to ensure that the environmental conditions of the other sides of the heat-conducting medium material 10 are the same as those on the back of the photovoltaic module 50, so as to ensure that the heat flux density in the heat-conducting medium material 10 is the same as that in the back panel 51 and the back adhesive film 52 materials. Here, it is required that the thickness of the heat-conducting medium material 10 cannot be too thick. In some embodiments, the plate thickness of the heat-conducting medium material 10 includes but is not limited to 2 mm to 8 mm, specifically, for example, 2 mm, 4 mm, 5 mm, 6 mm or 8 mm. Of course, the plate thickness of the heat-conducting medium material 10 can also be set to any value less than 2 mm and greater than 8 mm, and can be flexibly adjusted and set according to actual needs.

[0063] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0064] In addition, if there are terms such as "first" and "second", these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, if there is a term "plurality", the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0065] In the present application, unless otherwise clearly specified and limited, if there are terms such as "mounted", "connected", "coupled", "fixed", etc., these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0066] In the present application, unless otherwise clearly specified and limited, if there is a description such as a first feature being "on" or "under" a second feature, the meaning may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0067] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate 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 intermediate element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0068] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope described in this specification.

[0069] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A working temperature measuring device for a photovoltaic module (50), characterized in that, The working temperature measuring device of the photovoltaic module (50) includes: A heat-conducting medium material (10), which is used to be attached to the back panel (51) of the photovoltaic module (50); A first temperature probe (20), which is used to detect a first temperature T1 on the side of the heat-conducting medium material (10) facing away from the photovoltaic module (50); A second temperature probe (30), which is used to detect a second temperature T2 on the side of the heat-conducting medium material (10) facing the photovoltaic module (50); and A controller (40), which is electrically connected to the first temperature probe (20) and the second temperature probe (30) respectively. The controller (40) is used to obtain the working temperature T4 of the battery cells inside the photovoltaic module (50) according to the first temperature T1 and the second temperature T2.

2. The working temperature measuring device of the photovoltaic module (50) according to claim 1, characterized in that, The working temperature measuring device of the photovoltaic module (50) further includes a fixing structure (60); the fixing structure (60) is used to attach the heat-conducting medium material (10) to the back panel (51) of the photovoltaic module (50); the fixing structure (60) is also connected to the controller (40), the first temperature probe (20), and the second temperature probe (30) respectively.

3. The working temperature measuring device of the photovoltaic module (50) according to claim 2, characterized in that, The fixing structure (60) is arranged on the outer periphery of the heat-conducting medium material (10); the fixing structure (60) is arranged in a hollow structure.

4. The working temperature measuring device of the photovoltaic module (50) according to claim 3, characterized in that, The fixing structure (60) includes at least one fixing post (61) and a connecting member (62) correspondingly arranged at one end of the fixing post (61); the connecting member (62) is connected to the heat-conducting medium material (10), and the other end of the fixing post (61) is connected to the controller (40).

5. The working temperature measuring device for the photovoltaic module (50) according to claim 4, characterized in that, Both the fixing post (61) and the connecting member (62) are provided in plurality. Each connecting member (62) is correspondingly arranged on each fixing post (61), and each connecting member (62) is correspondingly connected to each corner of the heat-conducting medium material (10).

6. The working temperature measuring device of the photovoltaic module (50) according to claim 3, characterized in that, The working temperature measuring device of the photovoltaic module (50) further includes at least one elastic member (70). The side of the heat-conducting medium material (10) facing away from the back panel (51) is connected to the fixing structure (60) through the elastic member (70), and when the heat-conducting medium material (10) is not attached to the back panel (51), at least part of the material of the heat-conducting medium material (10) protrudes from the side of the fixing structure (60) facing the back panel (51).

7. The working temperature measuring device of the photovoltaic module (50) according to claim 2, characterized in that, The fixing structure (60) is provided with at least one suction cup (63), and the suction cup (63) is adsorbed and fixed on the back panel (51).

8. The working temperature measuring device of the photovoltaic module (50) according to claim 1, characterized in that, The heat-conducting medium material (10) is a plate member with uniform thickness.

9. The working temperature measuring device of the photovoltaic module (50) according to claim 8, characterized in that, The plate thickness of the heat-conducting medium material (10) is 2 mm to 8 mm.

10. The working temperature measuring device of the photovoltaic module (50) according to any one of claims 1 to 9, characterized in that, The controller (40) is provided with a display screen (45) for displaying the working temperature T4, and at least one button (46) capable of inputting test parameters.

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