Photovoltaic module hot spot test method

Abstract

The invention discloses a photovoltaic module hot spot test method and device, computing equipment and a storage medium. According to the technical scheme provided by the invention, for all the battery pieces in the photovoltaic module, each time a preset number of battery pieces are selected, that is, the battery pieces are connected in series through the connecting assemblies to form a plurality of battery strings; performing temperature detection on each battery string based on a first preset condition to obtain first temperature data corresponding to each battery string; according to the first temperature data, screening from each battery string according to a second preset condition to obtain a target battery piece; and performing a hot spot shielding test on the target battery piece to obtain a temperature value corresponding to the highest hot spot position of the target battery piece. According to the invention, the battery pieces in the photovoltaic module are connected in series and then irradiated, so that the time for selecting the target battery piece is greatly shortened, and the leakage current density is represented directly based on the defect points based on the principle that the defect points are heated due to darkroom electrification, so that the battery pieces with high hot spot temperature can be selected more accurately and quickly.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic power generation, and in particular to a method, a device, a computing device and a computer storage medium for testing hot spots of photovoltaic components. Background Art

[0002] With the continuous development of social economy, human beings consume more and more energy, the reserves of traditional fossil energy are becoming increasingly depleted, and the pollution caused by the use of fossil energy is becoming more and more serious. Therefore, people have turned their attention to various types of emerging clean energy. Among them, solar energy, as the most important and relatively easy to obtain clean energy, has naturally received everyone's attention and utilization.

[0003] The main way to utilize solar energy is solar photovoltaic power generation. Solar cell modules are usually installed in open areas with plenty of sunshine. In long-term use, it is inevitable that flying birds, dust, fallen leaves and other obstructions will fall on the solar cell modules. These obstructions will form shadows on the solar cell modules. In large solar cell module arrays, the row spacing is not suitable and shadows can be formed on each other. Due to the existence of local shadows, the current and voltage of some cells in the solar cell module have changed. As a result, the product of the local current and voltage of the solar cell module increases, which causes local temperature rise on these cell modules and produces hot spot effect. If the temperature generated by the hot spot effect exceeds the tolerance limit of the module, it may melt the solder joints of the photovoltaic module and destroy the grid line, resulting in the scrapping of the entire solar cell module or even a fire in the power station.

[0004] Therefore, hot spot safety testing is required for solar cell modules. Currently, the cells for testing are usually selected based on the inflection point current, and then tested. However, this method takes too long to select cells, and the time cost is too high; and according to the hot spot principle, the highest hot spot temperature is related to the leakage current density, not the size of the leakage current. Therefore, the accuracy of the test results cannot be guaranteed when selecting cells based on the leakage current size, and it is impossible to effectively draw a conclusion on whether the corresponding cells being tested meet the safety requirements, resulting in safety risks for the solar modules that undergo safety testing as a whole. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a photovoltaic module hot spot testing method and a corresponding photovoltaic module hot spot testing device, a computing device and a computer storage medium.

[0006] According to one aspect of the present invention, a method for testing hot spots of photovoltaic modules is provided, the method comprising:

[0007] For all the cells in the photovoltaic module, a preset number of cells are selected and then connected in series through a connecting component to form a plurality of cell strings;

[0008] Performing temperature detection on each battery string based on a first preset condition to obtain first temperature data corresponding to each battery string;

[0009] According to the first temperature data, a target battery cell is obtained by screening from each battery string according to a second preset condition;

[0010] A hot spot occlusion test is performed on the target cell to obtain the temperature value corresponding to the highest hot spot position of the target cell.

[0011] In the above scheme, for all the cells in the photovoltaic module, a preset number of cells are selected each time, and then they are connected in series through a connecting component to form a plurality of cell strings, further comprising:

[0012] The preset number is 2;

[0013] Every two battery cells in all the battery cells are connected in series through a connecting assembly to generate multiple battery strings; wherein,

[0014] The connection component is a three-part junction box.

[0015] In the above solution, the temperature detection of each battery string based on the first preset condition to obtain first temperature data corresponding to each battery string further includes:

[0016] The battery string connected in series by connecting components is placed in a dark room environment;

[0017] Apply test voltage to the battery string that has been connected in series, perform temperature monitoring, and obtain temperature monitoring results of the battery string in real time;

[0018] Based on the real-time temperature monitoring result, after the temperature of the battery cell in the corresponding battery string no longer rises, infrared photos are taken for the battery cell therein and temperature detection is performed to obtain first temperature data.

[0019] In the above solution, the method of selecting target battery cells from each battery string according to the first temperature data and the second preset condition further includes:

[0020] Based on the first temperature data, select the cell with the highest temperature from the edge cells of the photovoltaic module; select the two cells with the highest temperature from the non-edge cells of the photovoltaic module; select the cell with the lowest temperature from all the cells of the photovoltaic module; and use the screened cells as target cells.

[0021] In the above scheme, the hot spot shielding test is performed on the target cell to obtain the temperature value corresponding to the highest hot spot position of the target cell, further comprising:

[0022] Short-circuit and fully shield each target cell, and place it under a steady-state light source for a first preset time;

[0023] Determine the second temperature data of each target battery cell, and determine the highest hot spot position of each target battery cell;

[0024] According to the optimal shielding ratio corresponding to each target cell, shield the target cell, and place the target cell under a steady-state light source for a second preset time; wherein the exposed area includes the highest hot spot position corresponding to the target cell;

[0025] Take an infrared photo of the target cell and perform temperature detection, obtain the infrared photo and temperature data of the target cell, and obtain the temperature value corresponding to the highest hot spot position of the target cell.

[0026] In the above scheme, before performing the hot spot shielding test on the target cell to obtain the temperature value corresponding to the highest hot spot position of the target cell, shielding the target cell according to the optimal shielding ratio corresponding to each target cell further includes:

[0027] Perform a step shading test on each target cell to obtain the test current under different shading ratios;

[0028] Compare the test currents under different shielding ratios with the maximum power current under no shielding to determine the best test current that is closest to the maximum power current;

[0029] The shielding ratio corresponding to the optimal test current is determined as the optimal shielding ratio.

[0030] In the above solution, after obtaining the temperature value corresponding to the highest hot spot position of the target battery cell, the method further includes:

[0031] Compare the temperature value corresponding to the highest hot spot with the component safety requirements;

[0032] Determine whether the current component meets the component safety requirements and obtain a safety determination result;

[0033] The safety determination results are sent and / or displayed.

[0034] According to another aspect of the present invention, a photovoltaic module hot spot testing device is provided, comprising: a battery series module, a first temperature measurement module, a target screening module and a second temperature measurement module; wherein:

[0035] The battery series connection module is used to select a preset number of battery cells from all the battery cells in the photovoltaic module, and then connect them in series through the connection components to form multiple battery strings;

[0036] The first temperature measurement module is used to detect the temperature of each battery string based on a first preset condition to obtain first temperature data corresponding to each battery string;

[0037] The target screening module is used to screen target battery cells from each battery string according to the first temperature data and the second preset condition;

[0038] The second temperature measurement module is used to perform a hot spot occlusion test on the target battery cell to obtain a temperature value corresponding to the highest hot spot position of the target battery cell.

[0039] According to another aspect of the present invention, there is provided a computing device, comprising: a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other via the communication bus;

[0040] The memory is used to store at least one executable instruction, and the executable instruction enables the processor to perform operations corresponding to the above-mentioned photovoltaic component hot spot testing method.

[0041] According to another aspect of the present invention, a computer storage medium is provided, wherein the storage medium stores at least one executable instruction, and the executable instruction enables a processor to perform operations corresponding to the above-mentioned photovoltaic module hot spot testing method.

[0042] According to the technical solution provided by the present invention, for all the cells in the photovoltaic module, a preset number of cells are selected each time, and they are connected in series through a connecting component to form a plurality of cell strings; temperature detection is performed on each cell string based on a first preset condition to obtain first temperature data corresponding to each cell string; based on the first temperature data, target cells are screened from each cell string according to a second preset condition; a hot spot shading test is performed on the target cell to obtain a temperature value corresponding to the highest hot spot position of the target cell. By using the connection component, the cells in the photovoltaic module are connected in series, so that the subsequent process does not need to screen individual cells one by one, but only needs to screen based on the cell string during the preliminary temperature detection, which greatly reduces the time required for selecting cells and improves the overall test efficiency; infrared photography is performed on the cell string in a reverse bias state in a darkroom environment, and infrared photos and temperature data are obtained to accurately obtain the area with high heat flux density on the cell, and thus more scientifically characterize the area with higher leakage current density, which helps to obtain more accurate maximum hot spot temperature values ​​in subsequent detection, effectively improving the accuracy of the test; by selecting cells with specific requirements, that is, the three cells with the highest temperature (including one cell at the edge of the module) and and the one with the lowest temperature, so that the final tested battery cells include both those at the center and the edge of the component, while taking into account the battery cells with the lowest current temperature that have not been challenged during operation, and reasonably testing each feature type in the component to ensure the scientificity and comprehensiveness of the test, and effectively improve the accuracy of the safety test; through the step shading test, the best shading ratio is determined, and the highest hotspot position is determined, so that in the hot spot shading test, more accurate temperature data can be obtained based on the best shading ratio and the highest hotspot position, and the highest temperature in the battery cell can be determined, so as to further accurately judge whether it meets the safety requirements of the component, so as to help the staff to carry out further processing, which greatly reduces the probability of safety risks in photovoltaic components.

[0043] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0044] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0046] Figure 1A schematic flow chart of a method for chemometric analysis of hot spot testing of photovoltaic modules based on partial least squares method according to an embodiment of the present invention is shown;

[0047] Figure 2 A schematic diagram of a process of a hot spot shielding test method for a battery cell according to an embodiment of the present invention is shown;

[0048] Figure 3 A schematic flow chart of a method for determining an optimal shading ratio of a hot spot test according to an embodiment of the present invention is shown;

[0049] Figure 4 A structural block diagram of a photovoltaic module hot spot testing device according to an embodiment of the present invention is shown;

[0050] Figure 5 A schematic structural diagram of a computing device according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0051] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0052] Figure 1 A schematic flow chart of a photovoltaic module hot spot testing method according to an embodiment of the present invention is shown, the method comprising the following steps:

[0053] Step S101 : for all the cells in the photovoltaic module, a preset number of cells are selected and connected in series through a connecting assembly to form a plurality of cell strings.

[0054] Preferably, the preset number is 2;

[0055] Every two battery cells in all the battery cells are connected in series through a connecting assembly to generate multiple battery strings; wherein,

[0056] The connection assembly is a three-part junction box. Before the hot spot test of the method is performed, the busbars of each cell are led out but not short-circuited, and the junction box is not installed, so that the photovoltaic assembly is in a short-circuit state.

[0057] In subsequent testing, the battery string needs to be in a reverse bias state of 12V, and the battery string needs to be temperature detected and infrared photographed. That is, the voltage for the battery string is the number of series cells * 12V, and the range of temperature detection and infrared photography can cover the entire battery string. Therefore, the preset number of cells in the battery string can be determined based on the actual voltage that can be provided, as well as the actual range of temperature detection and infrared photography, and is not limited here. The larger the preset number, the shorter the time it takes to select the cell, and the more it can improve the overall test efficiency.

[0058] Step S102 : performing temperature detection on each battery string based on a first preset condition to obtain first temperature data corresponding to each battery string.

[0059] Specifically, the first preset condition is: placing the battery string connected in series using the connection assembly in a dark room environment;

[0060] Apply test voltage to the battery string that has been connected in series, perform temperature monitoring, and obtain temperature monitoring results of the battery string in real time;

[0061] Based on the real-time temperature monitoring result, after the temperature of the battery cell in the corresponding battery string no longer rises, infrared photos are taken for the battery cell therein and temperature detection is performed to obtain first temperature data.

[0062] Furthermore, the time for applying voltage to the battery string is usually 10-20 minutes, during which time the temperature of the battery cell usually reaches a stable state.

[0063] Step S103 , according to the first temperature data and the second preset condition, a target battery cell is obtained by screening from each battery string.

[0064] Specifically, the method of selecting target battery cells from each battery string according to the first temperature data and the second preset condition further includes:

[0065] The second preset condition is: based on the first temperature data, select a cell with the highest temperature from the edge cells of the photovoltaic module; select two cells with the highest temperature from the non-edge cells of the photovoltaic module; select a cell with the lowest temperature from all the cells of the photovoltaic module; and use the screened cell as the target cell.

[0066] Step S104, performing a hot spot shielding test on the target cell to obtain a temperature value corresponding to the highest hot spot position of the target cell.

[0067] Specifically, after obtaining the temperature value corresponding to the highest hot spot position of the target battery cell, the method further includes:

[0068] Compare the temperature value corresponding to the highest hot spot with the component safety requirements;

[0069] Determine whether the current component meets the component safety requirements and obtain a safety determination result;

[0070] The safety determination results are sent and / or displayed.

[0071] According to a hot spot test method for photovoltaic modules provided by the present embodiment, for all the cells in the photovoltaic module, a preset number of cells are selected each time, and they are connected in series through a connecting component to form multiple cell strings; temperature detection is performed on each cell string based on a first preset condition to obtain first temperature data corresponding to each cell string; based on the first temperature data, target cells are screened from each cell string according to a second preset condition; a hot spot shielding test is performed on the target cell to obtain a temperature value corresponding to the highest hot spot position of the target cell. According to a hot spot test method for photovoltaic modules provided by the present embodiment, the cells in the photovoltaic module are connected in series by using a connecting component, so that the subsequent process does not need to screen individual cells one by one, but only needs to screen based on the cell string when performing preliminary temperature detection, thereby greatly reducing the time required for the process of selecting cells and improving the overall test efficiency; infrared photography is performed on the cell string in a darkroom environment and in a reverse bias state, and infrared photos and temperature data are obtained, which is helpful for subsequent detection to obtain more accurate highest hot spot temperature values, effectively improving the accuracy of the test; by selecting cells with specific requirements, the final tested cell The slice includes both the center and edge positions of the component, and takes into account the cell with the lowest current temperature that has not been challenged during operation. Each characteristic type in the component is tested reasonably to ensure the scientific and comprehensive nature of the test, and effectively improve the accuracy of the safety test. By determining the highest hotspot position, the hot spot shading test can obtain more accurate temperature data based on the optimal shading ratio and the highest hotspot position, and determine the highest temperature in the cell. This makes it possible to further accurately judge whether it meets the safety requirements of the component, so as to help staff carry out further processing, greatly reducing the probability of safety risks in photovoltaic components.

[0072] Figure 2 A schematic diagram of a process of a hot spot shielding test method for a battery cell according to an embodiment of the present invention is shown;

[0073] like Figure 2 As shown, the method comprises the following steps:

[0074] Step S201 , short-circuiting and fully shielding each target cell, and placing it under a steady-state light source for a first preset time.

[0075] Preferably, the first preset duration may be 30 minutes.

[0076] Step S202 , measuring the second temperature data of each target battery cell, and determining the highest hot spot position of each target battery cell.

[0077] Step S203, shielding the target cell according to the optimal shielding ratio corresponding to each target cell, and placing the target cell under a steady-state light source for a second preset time.

[0078] Preferably, the exposed area includes the highest hot spot position corresponding to the target battery cell; the second preset time length may be 1 hour.

[0079] Step S204, taking an infrared photo of the target cell and performing temperature detection, obtaining the infrared photo and temperature data of the target cell, and obtaining the temperature value corresponding to the highest hot spot position of the target cell.

[0080] The optimal occlusion ratio is determined as follows: Figure 3 As shown,

[0081] Figure 3 A schematic flow chart of a method for determining an optimal shading ratio of a hot spot test according to an embodiment of the present invention is shown;

[0082] The method comprises the following steps:

[0083] Step S301 , performing a step shielding test on each target battery cell to obtain test currents under different shielding ratios.

[0084] Specifically, for each target battery cell, a step shielding test is performed in a manner of increasing the shielding area by 10% each time to obtain the test current under different shielding ratios.

[0085] Step S302 : comparing the test currents under different shielding ratios with the maximum power current under the unshielded state to determine the optimal test current.

[0086] Specifically, the test current that is closest to the maximum power current among multiple test currents under different shielding ratios is used as the optimal test current.

[0087] Step S303: determine the shielding ratio corresponding to the optimal test current as the optimal shielding ratio.

[0088] Furthermore, based on the determined optimal shielding ratio, step S203 in the above method is performed to perform temperature detection.

[0089] According to the above method, the optimal shielding ratio can be determined through the step shielding test, thereby accurately determining the position in the cell where the main power generation is completed and determining the highest hot spot position, thereby obtaining more accurate temperature data based on the optimal shielding ratio and the highest hot spot position in the hot spot shielding test, and determining the highest temperature in the cell, thereby being able to further accurately judge whether it meets the safety requirements of the component, so as to help the staff to carry out further processing, greatly reducing the probability of safety risks in the overall photovoltaic component.

[0090] Figure 4 FIG. 4 shows a structural block diagram of a photovoltaic module hot spot testing device according to an embodiment of the present invention. Figure 4 As shown, the system includes: a battery series module 401, a first temperature measurement module 402, a target screening module 403 and a second temperature measurement module 404; wherein,

[0091] The battery series connection module 401 is used for selecting a preset number of battery cells from all the battery cells in the photovoltaic module, and connecting them in series through connecting components to form multiple battery strings.

[0092] Preferably, the battery series module 401 is further used for:

[0093] The preset number is 2;

[0094] Every two battery cells in all the battery cells are connected in series through a connecting assembly to generate multiple battery strings; wherein,

[0095] The connection component is a three-part junction box.

[0096] The first temperature measurement module 402 is used to detect the temperature of each battery string based on a first preset condition to obtain first temperature data corresponding to each battery string.

[0097] Preferably, the first temperature measurement module 402 is further used to:

[0098] The battery string connected in series by connecting components is placed in a dark room environment;

[0099] Apply test voltage to the battery string that has been connected in series, perform temperature monitoring, and obtain temperature monitoring results of the battery string in real time;

[0100] Based on the real-time temperature monitoring result, after the temperature of the battery cell in the corresponding battery string no longer rises, infrared photos are taken for the battery cell therein and temperature detection is performed to obtain first temperature data.

[0101] The target screening module 403 is used to screen target battery cells from each battery string according to the first temperature data and the second preset condition.

[0102] Preferably, the target screening module 403 is further used to:

[0103] Based on the first temperature data, select the cell with the highest temperature from the edge cells of the photovoltaic module; select the two cells with the highest temperature from the non-edge cells of the photovoltaic module; select the cell with the lowest temperature from all the cells of the photovoltaic module; and use the screened cells as target cells.

[0104] The second temperature measurement module 404 is used to perform a hot spot shading test on the target cell to obtain a temperature value corresponding to the highest hot spot position of the target cell.

[0105] Preferably, the second temperature measurement module 404 is further used to:

[0106] Short-circuit and fully shield each target cell, and place it under a steady-state light source for a first preset time;

[0107] Determine the second temperature data of each target battery cell, and determine the highest hot spot position of each target battery cell;

[0108] According to the optimal shielding ratio corresponding to each target cell, shield the target cell, and place the target cell under a steady-state light source for a second preset time; wherein the exposed area includes the highest hot spot position corresponding to the target cell;

[0109] Take an infrared photo of the target cell and perform temperature detection, obtain the infrared photo and temperature data of the target cell, and obtain the temperature value corresponding to the highest hot spot position of the target cell.

[0110] Preferably, before performing the hot spot shading test on the target cell to obtain the temperature value corresponding to the highest hot spot position of the target cell, the second temperature measurement module 404 is further used to:

[0111] Perform a step shading test on each target cell to obtain the test current under different shading ratios;

[0112] Compare the test currents under different shielding ratios with the maximum power current under no shielding to determine the best test current that is closest to the maximum power current;

[0113] The shielding ratio corresponding to the optimal test current is determined as the optimal shielding ratio.

[0114] Preferably, after obtaining the temperature value corresponding to the highest hot spot position of the target battery cell, the second temperature measurement module 404 is further used to:

[0115] Compare the temperature value corresponding to the highest hot spot with the component safety requirements;

[0116] Determine whether the current component meets the component safety requirements and obtain a safety determination result;

[0117] The safety determination results are sent and / or displayed.

[0118] A photovoltaic module hot spot testing device provided according to the present embodiment includes: a battery series connection module, a first temperature measurement module, a target screening module and a second temperature measurement module; wherein the battery series connection module is used for selecting a preset number of battery cells from all the battery cells in the photovoltaic module, that is, connecting them in series through a connecting component to form a plurality of battery strings; the first temperature measurement module is used for performing temperature detection on each battery string based on a first preset condition to obtain first temperature data corresponding to each battery string; the target screening module is used for screening target battery cells from each battery string according to the first temperature data and the second preset condition; the second temperature measurement module is used for performing a hot spot shading test on the target battery cell to obtain a temperature value corresponding to the highest hot spot position of the target battery cell. A photovoltaic module hot spot test device provided by the present embodiment uses a connection component to connect the cells in the photovoltaic module in series, so that the subsequent process does not need to screen individual cells one by one, but only needs to screen based on the cell string when performing preliminary temperature detection, thereby greatly reducing the time required for selecting the cell and improving the overall test efficiency; infrared photography is performed on the cell string in a reverse bias state in a darkroom environment, infrared photos are obtained and temperature data are obtained, and the area with high heat flux density on the cell is accurately obtained, thereby more scientifically characterizing the area with greater leakage current density, which is helpful for subsequent detection to obtain a more accurate maximum hot spot temperature value, and effectively improving the accuracy of the test; by selecting cells with specific requirements, that is, the three cells with the highest temperature (including The cell at the edge of the component and the cell with the lowest temperature are selected, so that the final tested cell includes both the cell at the center and the edge of the component, while taking into account the cell with the lowest temperature that has not been challenged during operation. Each characteristic type in the component is tested reasonably to ensure the scientificity and comprehensiveness of the test, and effectively improve the accuracy of the safety test. The best shading ratio is determined through the step shading test, and the highest hotspot position is determined. Therefore, more accurate temperature data can be obtained in the hot spot shading test based on the best shading ratio and the highest hotspot position, and the highest temperature in the cell is determined, so as to further accurately judge whether it meets the safety requirements of the component, so as to help the staff to carry out further processing, which greatly reduces the probability of safety risks in photovoltaic components.

[0119] The present invention also provides a non-volatile computer storage medium, which stores at least one executable instruction, and the executable instruction can execute a photovoltaic component hot spot testing method in any of the above method embodiments.

[0120] Figure 5 A schematic diagram of the structure of a computing device according to an embodiment of the present invention is shown. The specific embodiment of the present invention does not limit the specific implementation of the computing device.

[0121] like Figure 5 As shown, the computing device may include: a processor (processor) 502 , a communications interface (Communications Interface) 504 , a memory (memory) 506 , and a communication bus 508 .

[0122] in:

[0123] The processor 502 , the communication interface 504 , and the memory 506 communicate with each other via a communication bus 508 .

[0124] The communication interface 504 is used to communicate with other devices such as clients or other servers.

[0125] The processor 502 is used to execute the program 510, and specifically can execute the relevant steps in the above-mentioned photovoltaic module hot spot testing method embodiment.

[0126] Specifically, the program 510 may include program codes, and the program codes include computer operation instructions.

[0127] The processor 502 may be a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention. The one or more processors included in the computing device may be processors of the same type, such as one or more CPUs; or processors of different types, such as one or more CPUs and one or more ASICs.

[0128] The memory 506 is used to store the program 510. The memory 506 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0129] The program 510 can be specifically used to enable the processor 502 to execute a photovoltaic module hot spot test method in any of the above method embodiments. The specific implementation of each step in the program 510 can refer to the corresponding descriptions in the corresponding steps and units in the above photovoltaic module hot spot test method embodiment, which will not be repeated here. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the above-described devices and modules can refer to the corresponding process description in the above-mentioned method embodiment, which will not be repeated here.

[0130] The algorithm and display provided herein are not inherently related to any particular computer, virtual system or other device. Various general purpose systems can also be used together with the teachings based on this. According to the above description, it is obvious that the structure required for constructing such systems. In addition, the present invention is not directed to any specific programming language either. It should be understood that various programming languages ​​can be utilized to realize the content of the present invention described herein, and the description of the above specific languages ​​is for disclosing the best mode of the present invention.

[0131] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0132] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those expressly recited in each claim. Rather, as reflected in the claims, inventive aspects lie in less than all of the features of the individual embodiments previously disclosed. Therefore, the claims that follow the detailed description are hereby expressly incorporated into the detailed description, with each claim itself serving as a separate embodiment of the present invention.

[0133] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments may be combined into one module or unit or component, and in addition they may be divided into a plurality of submodules or subunits or subcomponents. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0134] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0135] The various component embodiments of the present invention can be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. It should be understood by those skilled in the art that a microprocessor or digital signal processor (DSP) can be used in practice to implement some or all of the functions of some or all of the components in the embodiments of the present invention. The present invention can also be implemented as a device or apparatus program (e.g., computer program and computer program product) for executing part or all of the methods described herein. Such a program implementing the present invention can be stored on a computer-readable medium, or can have the form of one or more signals. Such a signal can be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

[0136] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for testing hot spots of photovoltaic modules, comprising: For all the cells in the photovoltaic module, a preset number of cells are selected and then connected in series through a connecting component to form a plurality of cell strings; Performing temperature detection on each battery string based on a first preset condition to obtain first temperature data corresponding to each battery string; According to the first temperature data, a target battery cell is obtained by screening from each battery string according to a second preset condition; A hot spot occlusion test is performed on the target cell to obtain the temperature value corresponding to the highest hot spot position of the target cell.

2. The method according to claim 1, characterized in that The method further comprises: selecting a preset number of cells from all cells in the photovoltaic module, and connecting them in series through a connecting assembly to form a plurality of cell strings; The preset number is 2; Every two battery cells in all the battery cells are connected in series through a connecting assembly to generate multiple battery strings; wherein, The connection component is a three-part junction box.

3. The method according to claim 1, characterized in that The performing temperature detection on each battery string based on the first preset condition to obtain first temperature data corresponding to each battery string further includes: The battery string connected in series by connecting components is placed in a dark room environment; Apply test voltage to the battery string that has been connected in series, perform temperature monitoring, and obtain temperature monitoring results of the battery string in real time; Based on the real-time temperature monitoring result, after the temperature of the battery cell in the corresponding battery string no longer rises, infrared photos are taken for the battery cell therein and temperature detection is performed to obtain first temperature data.

4. The method according to claim 1, characterized in that: The method of selecting target battery cells from each battery string according to the first temperature data and the second preset condition further includes: Based on the first temperature data, select the cell with the highest temperature from the edge cells of the photovoltaic module; select the two cells with the highest temperature from the non-edge cells of the photovoltaic module; select the cell with the lowest temperature from all the cells of the photovoltaic module; and use the screened cells as target cells.

5. The method according to claim 1, characterized in that The hot spot shielding test is performed on the target cell to obtain the temperature value corresponding to the highest hot spot position of the target cell, further comprising: Short-circuit and fully shield each target cell, and place it under a steady-state light source for a first preset time; Determine the second temperature data of each target battery cell, and determine the highest hot spot position of each target battery cell; According to the optimal shielding ratio corresponding to each target cell, shield the target cell, and place the target cell under a steady-state light source for a second preset time; wherein the exposed area includes the highest hot spot position corresponding to the target cell; Take an infrared photo of the target cell and perform temperature detection, obtain the infrared photo and temperature data of the target cell, and obtain the temperature value corresponding to the highest hot spot position of the target cell.

6. The method according to claim 5, characterized in that Before performing the hot spot shielding test on the target cell to obtain the temperature value corresponding to the highest hot spot position of the target cell, shielding the target cell according to the optimal shielding ratio corresponding to each target cell further includes: Perform a step shading test on each target cell to obtain the test current under different shading ratios; Compare the test currents under different shielding ratios with the maximum power current under no shielding to determine the best test current that is closest to the maximum power current; The shielding ratio corresponding to the optimal test current is determined as the optimal shielding ratio.

7. The method according to claim 1, characterized in that After obtaining the temperature value corresponding to the highest hot spot position of the target battery cell, the method further includes: Compare the temperature value corresponding to the highest hot spot with the component safety requirements; Determine whether the current component meets the component safety requirements and obtain a safety determination result; The safety determination results are sent and / or displayed.

8. A photovoltaic module hot spot testing device, comprising: A battery series module, a first temperature measurement module, a target screening module and a second temperature measurement module; wherein, The battery series connection module is used to select a preset number of battery cells from all the battery cells in the photovoltaic module, and then connect them in series through the connection components to form multiple battery strings; The first temperature measurement module is used to detect the temperature of each battery string based on a first preset condition to obtain first temperature data corresponding to each battery string; The target screening module is used to screen target battery cells from each battery string according to the first temperature data and the second preset condition; The second temperature measurement module is used to perform a hot spot occlusion test on the target battery cell to obtain a temperature value corresponding to the highest hot spot position of the target battery cell.

9. A computing device comprising: A processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other via the communication bus; The memory is used to store at least one executable instruction, and the executable instruction enables the processor to perform operations corresponding to a photovoltaic component hot spot testing method as described in any one of claims 1-7.

10. A computer storage medium, wherein at least one executable instruction is stored in the storage medium, and the executable instruction enables a processor to execute operations corresponding to a photovoltaic module hot spot testing method as described in any one of claims 1 to 7.

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