Test fixture for photovoltaic product

Abstract

The utility model discloses a test fixture for a photovoltaic product, and relates to the technical field of solar energy, the test fixture comprises a test platform, a frame and a top cover, the frame and the top cover are arranged on the test platform, the top cover is buckled with the frame, and a photovoltaic product to be tested is arranged between the top cover and the test platform. The top cover and the test platform respectively limit the upper surface and the lower surface of the photovoltaic product to be tested, the top cover is provided with a light-transmitting area for test light to pass through, and the light-transmitting area corresponds to a test area of the photovoltaic product to be tested. According to the test fixture provided by the invention, the test accuracy can be improved, and the performance of the photovoltaic product to be tested can be truly reflected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solar energy, in particular to a test fixture for photovoltaic products. BACKGROUND

[0002] With the continuous development of global economy, energy consumption also continues to grow, photovoltaic modules due to its non-polluting, renewable, by the people's attention, and to develop and widely used, in order to ensure the performance of photovoltaic modules, the need for IV performance testing.

[0003] When testing the IV performance of photovoltaic modules, the photovoltaic product to be tested is usually placed on the test platform to connect the test circuit, and then the solar simulator is used for irradiation to perform I-V test. The experiment is generally carried out in a dark box with fixed size, and the test area of the photovoltaic product to be tested receives the test light beam of the solar simulator. However, in the actual test process, it is impossible to achieve complete shading except for the test area, because the existence of surrounding glass will cause reflection or transmission of stray light, so that part of the light beam is irradiated from the side to the test area, resulting in inconsistency between the light intensity of the solar simulator recorded during the test and the actual light intensity entering the test area, deviation in the experiment, and the test result cannot truly reflect the performance of the photovoltaic product to be tested. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present application is to provide a test fixture for photovoltaic products, which can improve the accuracy of the test and solve the problem that the existing test fixture cannot truly reflect the performance of the photovoltaic product to be tested due to the influence of edge light.

[0005] The embodiment of the present application provides a test fixture for photovoltaic products, which comprises a test platform, a frame arranged on the test platform, and a top cover. The top cover is buckled with the frame, and the top cover and the test platform are used to arrange the photovoltaic product to be tested therebetween. The top cover and the test platform limit the upper and lower surfaces of the photovoltaic product to be tested, respectively. The top cover has a light transmission area for the test light to pass through, and the light transmission area corresponds to the test area of the photovoltaic product to be tested.

[0006] As an implementable way, the test fixture for photovoltaic products further comprises a light shielding gasket, which is fixedly connected to the inner wall of the top cover. In the state that the top cover is buckled with the frame, the light shielding gasket covers the photovoltaic product to be tested and extends from the periphery of the test area of the photovoltaic product to be tested to the side wall of the frame.

[0007] As an implementable way, the frame comprises at least one pair of telescopic members, which are telescopic to adjust the length of the frame. The test fixture for photovoltaic products is provided with a plurality of top covers. The light transmission area of each top cover corresponds to a photovoltaic product to be tested of different size. The top cover is detachably connected with the frame. By replacing the top cover and cooperating with the frame of different length, photovoltaic products to be tested of different size can be tested.

[0008] As an feasible approach, the light-transmitting area is equipped with a retractable blackout curtain, which adjusts the position and size of the light-transmitting area when it is extended or retracted.

[0009] As one feasible method, the blackout curtain includes a first blackout part and a second blackout part arranged opposite to each other along a first direction, and a third blackout part and a fourth blackout part arranged opposite to each other along a second direction. One side of the first blackout part, the second blackout part, the third blackout part and the fourth blackout part are respectively fixedly connected to the edge of the light-transmitting area, and the other side is extended and retracted to adjust the position and size of the light-transmitting area. The first direction is perpendicular to the second direction.

[0010] As one feasible approach, the test platform is a metal water-cooled plate, which is connected to an external heat exchange system to regulate the temperature of the test platform.

[0011] As one feasible approach, the testing platform has vents in the area where the photovoltaic product to be tested is placed. These vents are connected to an external air extraction system to create a negative pressure at the vents, which is used to adsorb the photovoltaic product to be tested.

[0012] As an feasible approach, the test fixture for photovoltaic products also includes a laser-assisted positioning component. The laser-assisted positioning component emits controlled laser marks, which are used to assist the user in placing the photovoltaic product to be tested in a preset position so that the light-transmitting area of ​​the top cover corresponds to the test area of ​​the photovoltaic product to be tested.

[0013] As one feasible approach, the top cover includes a support frame and a replaceable mask plate fixed to the support frame, the mask plate having a cutout area as a light-transmitting area.

[0014] As an feasible approach, wiring ports or cable passages are also provided on the side walls of the frame, and flexible light-shielding elements are provided at the wiring ports or cable passages to prevent light leakage at the wiring ports or cable passages.

[0015] As one feasible approach, the frame and the top cover are connected by a hinge; alternatively, the test fixture for photovoltaic products also includes a lifting mechanism, a controller, and a position sensor; the top cover is connected to the lifting mechanism, the lifting mechanism is connected to the controller, and the position sensor is used to detect whether the photovoltaic product under test is placed in a preset position. When the photovoltaic product under test is detected to be placed in the preset position, the lifting mechanism, under the control of the controller, lowers the top cover and engages with the frame.

[0016] As an alternative approach, magnetic assemblies are also provided on the frame and the top cover on opposite sides of the hinge.

[0017] The beneficial effects of the embodiments of this application include:

[0018] The photovoltaic product testing fixture provided in this application includes a testing platform and a frame and a top cover mounted on the testing platform. The top cover is fastened to the frame, and the space between the top cover and the testing platform is used to mount the photovoltaic product to be tested. The top cover and the testing platform respectively contact the upper and lower surfaces of the photovoltaic product to be tested, i.e., the testing platform and the top cover respectively restrict the upper and lower surfaces of the photovoltaic product. The top cover has a light-transmitting area for test light to pass through, which corresponds to the test area of ​​the photovoltaic product to be tested. Test light passes through the light-transmitting area and illuminates the test area of ​​the photovoltaic product to be tested. Since the top cover is opaque except for the light-transmitting area, stray light illuminating the test area of ​​the photovoltaic product to be tested from the side of the testing fixture is greatly reduced, thereby improving the accuracy of the test and enabling it to truly reflect the performance of the photovoltaic product to be tested. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a test fixture provided in an embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the structure of a blackout curtain provided in an embodiment of this application;

[0022] Figure 3 A schematic diagram of the framework provided in the embodiments of this application;

[0023] Figure 4 This diagram illustrates the integration of the framework and testing platform provided in the embodiments of this application.

[0024] Icons: 100-Test fixture; 110-Test platform; 111-Air vent; 120-Frame; 121-Telescopic component; 122-Light-shielding component; 130-Top cover; 131-Light-transmitting area; 132-Light-shielding pad; 133-Light-shielding curtain; 134-First light-shielding part; 135-Second light-shielding part; 136-Third light-shielding part; 137-Fourth light-shielding part; 141-Hinge; 142-Magnetic assembly. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0027] In the description of this application, it should be noted that the terms "center," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] The IV performance of photovoltaic products is a crucial performance indicator. After the photovoltaic products are manufactured, their IV performance must be tested before proceeding to the next step or shipping.

[0029] This application provides a test fixture 100 for photovoltaic products (hereinafter referred to as test fixture 100), such as Figure 1 As shown, the device includes a test platform 110 and a frame 120 and a top cover 130 disposed on the test platform 110. The top cover 130 is fastened to the frame 120. The top cover 130 and the test platform 110 are used to set the photovoltaic product to be tested. The top cover 130 and the test platform 110 respectively restrict the upper and lower surfaces of the photovoltaic product to be tested. The top cover 130 has a light-transmitting area 131 for the test light to pass through. When the top cover 130 and the frame 120 are fastened together, the light-transmitting area 131 corresponds to the test area of ​​the photovoltaic product to be tested.

[0030] The test fixture 100 in this embodiment is used to fix and accurately hold the photovoltaic product in place during testing, providing a stable electrical connection, blocking all light except for the effective test area to reduce reflection, and ensuring the authenticity and accuracy of the test data. The photovoltaic product in this embodiment can be any product requiring IV performance testing. For example, the photovoltaic product can be a solar cell with photoelectric conversion performance, or a packaged solar cell or photovoltaic module. The solar cell or photovoltaic module can be a single-junction or multi-junction stacked module.

[0031] Specifically, the test fixture 100 in this embodiment includes a test platform 110, a frame 120, and a top cover 130. The top cover 130 is fastened to the frame 120. The top cover 130 and the test platform 110 are used to place the photovoltaic product to be tested. The top cover 130 and the test platform 110 can respectively contact the upper and lower surfaces of the photovoltaic product to be tested. That is, the test platform 110 provides a plane for placing the photovoltaic product and provides bottom support for the photovoltaic product. The top cover 130 is fastened to the frame 120 to restrict the upper surface of the photovoltaic product. Optionally, the top cover may be provided with a number of protrusions, which correspond to the non-effective area of ​​the edge of the photovoltaic product when fastened.

[0032] When conducting IV performance testing on photovoltaic products, it is necessary to illuminate the photovoltaic products to test their performance under different lighting conditions. In this embodiment, the top cover 130 has a light-transmitting area 131 for the transmission of test light. When the photovoltaic product is placed between the top cover 130 and the test platform 110, the light-transmitting area 131 corresponds to the test area of ​​the photovoltaic product, allowing test light to pass through the light-transmitting area 131 and illuminate the test area of ​​the photovoltaic product. The test area of ​​the photovoltaic product receives the light and generates current and voltage. The performance of the photovoltaic product is reflected by the intensity of the light, the current, and the voltage.

[0033] In the above-mentioned testing process, the photovoltaic product is placed between the top cover 130 and the test platform 110 in the test fixture 100 of this application embodiment. The top cover 130 and the test platform 110 are in contact with the upper and lower surfaces of the photovoltaic product to be tested, respectively. The height of the frame 120 can be equivalent to the height of the photovoltaic product to be tested, which greatly reduces the height of the test fixture 100, thereby minimizing the light entering the side edge of the photovoltaic product to be tested, thereby improving the accuracy of the test and enabling the test structure to truly reflect the performance of the photovoltaic product to be tested.

[0034] The fastening method between the top cover 130 and the frame 120 is not limited in this embodiment. For example, when the test fixture 100 is used for automated testing, the top cover 130 and the frame 120 are movably connected. The movable connection is preferably a detachable pivot connection, such as a self-unloading buffer hinge connection.

[0035] In another embodiment, the test fixture 100 may further include a lifting mechanism, a controller, and a position sensor; the top cover 130 is connected to the lifting mechanism, the lifting mechanism is connected to the controller, and the position sensor is used to detect whether the photovoltaic product to be tested is placed in a preset position. When the photovoltaic product to be tested is detected to be placed in the preset position, the lifting mechanism, under the control of the controller, causes the top cover 130 to descend and engage with the frame 120.

[0036] Specifically, when the lifting mechanism raises the top cover 130 away from the frame 120, the photovoltaic product is placed inside the frame 120 or retrieved from within the frame 120. When the sensor detects that the photovoltaic product to be tested is placed in the preset position, the lifting mechanism fastens the top cover 130 onto the frame 120. Then, the system self-checks whether it is placed in the preset position, whether the temperature of the photovoltaic product to be tested is within the predetermined range, etc. After the self-check is completed and all items pass, the formal IV performance test begins. After the test is completed, the top cover automatically rises. This test fixture 100 can automatically perform light-related tests and is compatible with large-scale production lines.

[0037] As another example, it can be like Figure 1 As shown, the top cover 130 and the frame 120 are connected by a hinge 141. In this way, during testing, the top cover 130 is opened upwards, the photovoltaic product to be tested is placed into the frame 120, and then the top cover 130 and the frame 120 are fastened together for testing. The hinge makes it more convenient and faster to pick up and put down the photovoltaic product to be tested, which is more suitable for laboratory scenarios where different photovoltaic products to be tested are frequently tested.

[0038] The frame 120 and the top cover 130 are set to black or made of black metal material. Black has a light-absorbing effect, which absorbs the light that shines on the frame 120 and the top cover 130, further reducing stray light entering the photovoltaic product under test from the non-transparent area 131.

[0039] To improve the overall integrity of the test fixture 100, the light source can be integrated into the light-transmitting area 131 or above the light-transmitting area 131. Specifically, the light source can be a surface light source, which is set in the light-transmitting area 131.

[0040] In addition, in some embodiments, in order to reduce the volume of the test fixture 100, the frame 120 can be set to be about the same size as the photovoltaic product to be tested. In this way, on the one hand, the frame 120 can also limit the side of the photovoltaic product to be tested; on the other hand, stray light incident from the side is incident from the side of the photovoltaic product to be tested, without affecting the light intensity of the test area, thereby further improving the accuracy of the test results.

[0041] The test fixture 100 provided in this application includes a test platform 110 and a frame 120 and a top cover 130 disposed on the test platform 110. The top cover 130 is fastened to the frame 120, and the space between the top cover 130 and the test platform 110 is used to place the photovoltaic product to be tested. The top cover 130 and the test platform 110 respectively limit the upper and lower surfaces of the photovoltaic product to be tested. The height of the frame 120 is approximately equal to the height of the photovoltaic product to be tested. The top cover 130 has a light-transmitting area 131 for the test light to pass through. The light-transmitting area 131 corresponds to the test area of ​​the photovoltaic product to be tested. The test light passes through the light-transmitting area 131 and illuminates the test area of ​​the photovoltaic product to be tested. Since the height of the frame 120 is approximately equal to the height of the photovoltaic product to be tested, the stray light at the edges of the photovoltaic product to be tested is greatly reduced, thereby improving the accuracy of the test and enabling a true reflection of the performance of the photovoltaic product to be tested.

[0042] In one possible implementation of this application embodiment, the test fixture 100 further includes a light-shielding pad 132, which is fixedly connected to the inner wall of the top cover 130. When the top cover 130 and the frame 120 are fastened together, the light-shielding pad 132 covers the photovoltaic product to be tested and extends from the periphery of the test area of ​​the photovoltaic product to the side wall of the frame 120.

[0043] The light-shielding pad 132 can be made of flexible light-shielding material, which can simultaneously serve the purposes of light shading and protecting the photovoltaic product under test from scratches and cracks. The presence of the light-shielding pad 132 ensures that the top cover 130 and the photovoltaic product under test are in flexible contact (rather than rigid), avoiding damage such as scratches and microcracks to the photovoltaic product under test when the top cover 130 is fastened.

[0044] In this embodiment, a light-shielding pad 132 is fixedly connected to the inner wall of the top cover 130. When the top cover 130 and the frame 120 are fastened together, the light-shielding pad 132 extends to the side wall of the frame 120. Due to the presence of the light-shielding pad 132, except for the test light in the light-transmitting area 131, there is no reflected or transmitted stray light from the side edge of the photovoltaic product to the test area. This ensures that the light beam illuminating the test area is the test light that passes through the light-transmitting area 131, thus avoiding the influence of other stray light on the test results. This further improves the accuracy of the test and can truly reflect the performance of the photovoltaic product under test.

[0045] Alternatively, the height of the frame 120 in this application may be approximately the same as, or slightly greater than, the thickness of the photovoltaic product under test. The flexible shading pad 132 also serves to effectively limit the position of the photovoltaic product without causing damage.

[0046] Optional, such as Figure 2As shown, the frame 120 includes at least one pair of telescopic members 121, which extend and retract to adjust the length of the frame 120. The test fixture 100 is equipped with multiple top covers 130, and the light-transmitting area 131 of each top cover 130 corresponds to a photovoltaic product under test of a different size. The top cover 130 is detachably connected to the frame 120. By changing the top cover 130 to cooperate with the frame 120 of different lengths, photovoltaic products under test of different sizes can be tested.

[0047] In practical applications, there are many specifications of photovoltaic products. In order to make the test fixture 100 of this application applicable to photovoltaic products of different specifications, the frame 120 of this application embodiment adopts at least one pair of telescopic members 121 to adjust the length of the frame 120. When the telescopic members 121 extend, the length (and / or, the width) of the frame 120 increases to be suitable for testing larger photovoltaic products; when the telescopic members 121 retract, the length (and / or, the width) of the frame 120 decreases to be suitable for testing smaller photovoltaic products. Thus, the frame 120 of this application embodiment can be used to test photovoltaic products of different sizes, improving the adaptability of the test fixture 100.

[0048] It is understandable that when the length and / or width of the frame 120 changes, the dimensions of the frame 120 are adjusted, and the dimensions of the corresponding top cover 130 should also be adjusted accordingly. The test fixture 100 of this application is equipped with multiple top covers 130, and the light-transmitting area 131 of each top cover 130 corresponds to a photovoltaic product of different sizes to be tested. The top cover 130 is detachably connected to the frame 120, so that a suitable top cover 130 can be selected according to the size of the frame to match the testing requirements of photovoltaic products of different sizes.

[0049] It should be noted that when the size of the space enclosed by the frame 120 is adjustable, the test platform 110 should be set to be relatively large, such as... Figure 4 As shown, this ensures that the frame 120 remains on the test platform 110 during the expansion and contraction process.

[0050] It is understood that in practical applications, two of the telescopic members 121 in a pair are arranged opposite each other to adjust the dimensions of the telescopic members 121 in the extension direction. In practical applications, those skilled in the art can set the number of pairs of telescopic members 121 according to the actual situation to adjust the space enclosed by the frame 120.

[0051] In one possible implementation of the embodiments of this application, such as Figure 3 As shown, the light-transmitting area 131 is provided with a retractable blackout curtain 133, which adjusts the position and size of the light-transmitting area 131 when the blackout curtain 133 is extended or retracted.

[0052] In practical applications, there are various specifications of photovoltaic products to be tested, and corresponding test area sizes vary. To enable the test fixture 100 of this application to be applicable to the testing of photovoltaic products of different specifications, a retractable shading curtain 133 can be provided in the light-transmitting area 131. The shading curtain 133 blocks light, thus turning the light-transmitting area 131 into a shading area, thereby reducing the size of the light-transmitting area 131. Specifically, adjusting the degree of extension and retraction of the retractable shading curtain 133 adjusts the position and size of the light-transmitting area 131 to accommodate the test areas of photovoltaic products of different specifications. This allows the top cover 130 of this embodiment to be used for testing photovoltaic products of different sizes, improving the adaptability of the test fixture 100.

[0053] Specifically, such as Figure 3 As shown, the blackout curtain 133 includes a first blackout portion 134 and a second blackout portion 135 arranged opposite each other along a first direction, and a third blackout portion 136 and a fourth blackout portion 137 arranged opposite each other along a second direction. One side of the first blackout portion 134, the second blackout portion 135, the third blackout portion 136 and the fourth blackout portion 137 are respectively fixedly connected to the edge of the light-transmitting area 131, and the other side can be extended and retracted to adjust the position and size of the light-transmitting area 131. The first direction is perpendicular to the second direction.

[0054] The free ends of the first light-blocking part 134 and the second light-blocking part 135 move vertically to adjust the vertical length and position of the light-transmitting area 131; the free ends of the third light-blocking part 136 and the fourth light-blocking part 137 move horizontally to adjust the horizontal length and position of the light-transmitting area 131.

[0055] It is understandable that the two ends of the third light-blocking part 136 and the fourth light-blocking part 137 in the vertical direction need to cooperate with the movement of the first light-blocking part 134 and the second light-blocking part 135 to achieve the light-blocking effect, that is, the free ends of the third light-blocking part 136 and the fourth light-blocking part 137 include three.

[0056] In addition, in order to precisely control the expansion and contraction dimensions of each light-shielding part, it is possible to... Figure 3 As shown, a scale is set at the edge of the light-transmitting area 131, so that each light-blocking part can be adjusted according to the scale, thereby improving the accuracy of the light-transmitting area 131.

[0057] In some preferred embodiments, the test fixture is configured with multiple top covers 130, the size of the light-transmitting area 131 of which covers the size of common photovoltaic products. Some or all of these top covers 130 are designed with upper light-shielding curtains 133, which can fine-tune the position and size of the light-transmitting area 131 based on its original size. In reality, the size of silicon wafers (or other substrates) is often standardized, but due to limitations in the process conditions of different equipment, the effective area of ​​the final photovoltaic product may differ depending on the equipment or method. A fixed-size light-transmitting area 131 design often cannot match the test area of ​​the photovoltaic product under test. However, by using the test fixture of this embodiment, selecting a top cover 130 with an appropriately sized light-transmitting area 131, and then fine-tuning the light-transmitting area 131 using the light-shielding curtain 133, the light-transmitting area (formed by the light-shielding curtain 133 and the top cover 130) can be made as consistent as possible with the effective area of ​​the photovoltaic product under test, resulting in more accurate test results.

[0058] In other embodiments, the test fixture is equipped with one or more top covers 130. With multiple top covers 130, the size of their light-transmitting area 131 varies to cover the sizes of common photovoltaic products. The top cover 130 is provided with a flexible light-shielding pad 132. The flexible light-shielding pad 132 is replaceable, and its light-transmitting area has multiple pre-set sizes, or can be freely cut as needed. Similarly, the position and size of the light-transmitting area can be finely adjusted based on the original light-transmitting area 131, ultimately ensuring that the light-transmitting area (formed by the light-shielding pad 132 and the top cover 130) matches the effective area of ​​the photovoltaic product under test, resulting in more accurate test results.

[0059] In one possible implementation of this application embodiment, the test platform 110 is a metal water-cooled plate, which is connected to an external heat exchange system to regulate the temperature of the test platform 110, thereby controlling the test temperature of the photovoltaic product to be tested.

[0060] The longer the photovoltaic products under test, such as photovoltaic cells, are exposed to sunlight, the higher the temperature of the cells will be. Some special tests require a relatively long exposure time. However, according to IEC standards, the test should generally be conducted at 25°C, otherwise the test results will be biased.

[0061] In this embodiment of the application, in order to avoid the photovoltaic product under test from overheating and causing deviation in the test results, the test platform 110 is set as a metal water-cooled plate. The metal water-cooled plate is connected to an external heat exchange system for temperature regulation of the test platform 110. The photovoltaic product under test is placed on the test platform 110, thereby realizing temperature regulation of the photovoltaic product under test, avoiding overheating of the photovoltaic product under test, and ensuring that the photovoltaic product under test is within the preset temperature range during the test.

[0062] Optionally, the test platform 110 is provided with vents 111, which are connected to an external air extraction system. A negative pressure can be formed at the vents 111 to adsorb the photovoltaic products to be tested.

[0063] To prevent photovoltaic products, such as solar cells, from moving within the space enclosed by the frame 120 during testing, the testing platform 110 is equipped with vents 111. The photovoltaic cells are placed on the vents 111, where a negative pressure is created to adhere and fix the cells, preventing displacement. Essentially, during photovoltaic product testing, a negative pressure is created at the vents 111 to adhere the photovoltaic cells. When placing or removing the photovoltaic products, air is released through the vents 111 to release the adhesion, facilitating the removal of the photovoltaic cells.

[0064] The test platform 110 is made of metal, giving it excellent electrical conductivity. This provides support while also allowing the back electrodes of the photovoltaic products to be brought out, reducing wiring. The water-cooled components are insulated from the test platform but are thermally conductive.

[0065] In one possible implementation of this application embodiment, the test fixture 100 further includes a laser-assisted positioning component. The laser-assisted positioning component emits a laser mark under control. The laser mark is used to assist the user in placing the photovoltaic product to be tested in a preset position so that the light-transmitting area 131 of the top cover 130 corresponds to the test area of ​​the photovoltaic product to be tested.

[0066] The testing area for photovoltaic products is generally the region of the product with photoelectric conversion function (the cell area or the functional film layer distribution area). However, during packaging, there may be positional deviations relative to the entire substrate, making it impossible to standardize the positioning based solely on the external shape of the substrate (glass sheet or substrate). Laser-assisted positioning is used to solve this problem.

[0067] During laser-assisted positioning, the position of the cell or module is adjusted so that the cross-shaped laser mark is aligned with the four corners and center point of the area to be tested of the cell or module to ensure accurate alignment, and then it is adsorbed and fixed.

[0068] Optionally, the top cover 130 includes a support frame and a replaceable photomask fixed to the support frame. The photomask has a cutout area as a light-transmitting area 131. By directly using the photomask as the light-shielding component of the top cover 130, the cutout area can be cut out according to the size of the photovoltaic product to serve as the light-transmitting area 131. This allows for better matching of photovoltaic products of different sizes, and the use of the photomask can reduce the cost of the test fixture 100. For standard modules, pre-cut light-transmitting areas 131 of preset sizes can also be provided.

[0069] In one possible implementation of the embodiments of this application, such as Figure 1As shown, a wiring port or a wire passage is also provided on the side wall of the frame 120. The wiring port or wire passage is provided with a flexible light shield 122 to prevent light leakage at the wiring port or wire passage.

[0070] Those skilled in the art should know that when testing a photovoltaic product, it needs to be connected to external testing equipment. When using a line to connect the photovoltaic product to the testing equipment, the line needs to pass through the test fixture 100. In this embodiment, a wiring port or a wire passage is opened on the side wall of the frame 120. The wiring port or wire passage is used to set the line. In order to avoid light leakage at the wiring port or wire passage, this embodiment provides a flexible light-shielding member 122 at the wiring port or wire passage. The light-shielding member 122 can block light and prevent light leakage. Moreover, the flexible light-shielding member 122 can match the shape of the line to improve the light-shielding effect.

[0071] Optional, such as Figure 1 As shown, the frame 120 and the top cover 130 are connected by a hinge 141. On the opposite side of the hinge 141, the frame 120 and the top cover 130 are respectively provided with magnetic components 142.

[0072] When the test fixture 100 is used for manual testing, the hinge makes it easier and faster to pick up and put down the photovoltaic product under test, which is suitable for scenarios where the photovoltaic product under test is frequently changed. On the opposite side of the hinge 141, the frame 120 and the top cover 130 are respectively provided with magnetic suction components 142. The magnetic suction components 142 can stably close the opening ends of the top cover 130 and the frame 120, preventing light leakage or accidental opening during the test. In addition, the magnetic suction components 142 can be connected to a control device. During the test, the magnetic suction components 142 are attracted, so that the frame 120 and the top cover 130 are stably closed; after the test is completed, the magnetic suction components 142 are automatically released to open the top cover 130 and the frame 120.

[0073] It is understandable that the magnetic attraction assembly 142, including the magnet that releases the magnetic field and the magnetic attraction element located in the magnetic field, appears in a group, such as... Figure 1 As shown, magnets and magnetic suction components are respectively provided on the frame 120 and the top cover 130.

[0074] This application also provides a test fixture for photovoltaic products, including: a test platform; a frame disposed on the test platform; and a top cover, which is fastened to the frame. The top cover has a light-transmitting area for test light to pass through, and the light-transmitting area corresponds to the test area of ​​the photovoltaic product to be tested. The top cover is detachable and replaceable. Multiple sets of top covers can be designed, and the hollow area (i.e., the light-transmitting area) of each set matches the current size of the battery chip. For example, the test fixture can be equipped with the following top cover.

[0075] A set of interchangeable top covers, with light-transmitting areas covering common cell sizes and frequently used small component sizes, including:

[0076] Top cover A for small area (1cm*1cm) battery cells or modules: The hollow area can be 1cm*1cm, suitable for battery cells with a size of 1cm*1cm;

[0077] Top cover B for small area (5cm*5cm) battery cells or modules: The hollow area can be 5cm*5cm, suitable for battery cells with a size of 5cm*5cm;

[0078] Top cover C, suitable for large-area solar cells or modules: The cutout area can be 166mm*166mm, suitable for M6 size solar cells; Top cover D: The cutout area can be 210mm*105mm, suitable for 210 size solar cells.

[0079] Another adjustable perforated area on the top cover E:

[0080] Another top cover F is only a frame 120, which is used with multiple full-size light-blocking films. The cutout area of ​​the light-blocking film can be cut according to the test needs and pasted onto the frame 120.

[0081] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A test fixture for photovoltaic products, characterized in that, include: Test platform; The framework set on the test platform, and, A top cover is fastened to the frame, and the top cover and the test platform are used to set up the photovoltaic product to be tested. The top cover and the test platform respectively restrict the upper and lower surfaces of the photovoltaic product to be tested. The top cover has a light-transmitting area for test light to pass through, and the light-transmitting area corresponds to the test area of ​​the photovoltaic product to be tested.

2. The test fixture for photovoltaic products according to claim 1, characterized in that, Also includes: A light-shielding pad is fixedly connected to the inner wall of the top cover. When the top cover and the frame are fastened together, the light-shielding pad covers the photovoltaic product to be tested and extends from the periphery of the test area of ​​the photovoltaic product to the side wall of the frame.

3. The test fixture for photovoltaic products according to claim 1, characterized in that, The frame includes at least one pair of telescopic members that extend and retract to adjust the length of the frame. The test fixture is equipped with multiple top covers, each with a light-transmitting area corresponding to a photovoltaic product of different sizes to be tested. The top cover is detachably connected to the frame. By changing the top cover and matching it with frames of different lengths, photovoltaic products of different sizes can be tested.

4. The test fixture for photovoltaic products according to claim 1, characterized in that, The light-transmitting area is equipped with a retractable blackout curtain, which adjusts the position and size of the light-transmitting area when it is extended or retracted.

5. The test fixture for photovoltaic products according to claim 4, characterized in that, The blackout curtain includes a first blackout portion and a second blackout portion arranged opposite each other along a first direction, and a third blackout portion and a fourth blackout portion arranged opposite each other along a second direction. One side of the first blackout portion, the second blackout portion, the third blackout portion and the fourth blackout portion are respectively fixedly connected to the edge of the light-transmitting area, and the other side is extended and retracted to adjust the position and size of the light-transmitting area. The first direction is perpendicular to the second direction.

6. The test fixture for photovoltaic products according to claim 1, characterized in that, The test platform is a metal water-cooled plate, which is connected to an external heat exchange system to regulate the temperature of the test platform.

7. The test fixture for photovoltaic products according to claim 1 or 6, characterized in that, The testing platform has vents in the area where the photovoltaic product to be tested is placed. These vents are connected to an external air extraction system to create a negative pressure at the vents, which is used to adsorb the photovoltaic product to be tested.

8. The test fixture for photovoltaic products according to claim 1, characterized in that, It also includes a laser-assisted positioning component, which emits a laser marker in a controlled manner. The laser marker is used to assist the user in placing the photovoltaic product to be tested in a preset position so that the light-transmitting area of ​​the top cover corresponds to the test area of ​​the photovoltaic product to be tested.

9. The test fixture for photovoltaic products according to claim 1, characterized in that, The top cover includes a support frame and a replaceable mask plate fixed to the support frame. The mask plate has a hollow area as a light-transmitting area.

10. The test fixture for photovoltaic products according to claim 1, characterized in that, The side wall of the frame is also provided with a wiring port or a wire passage, and a flexible light-shielding element is provided at the wiring port or the wire passage to prevent light leakage at the wiring port or the wire passage.

11. The test fixture for photovoltaic products according to claim 1, characterized in that, The frame and the top cover are connected by a hinge; or... The test fixture for the photovoltaic product also includes a lifting mechanism, a controller, and a position sensor; the top cover is connected to the lifting mechanism, the lifting mechanism is connected to the controller, and the position sensor is used to detect whether the photovoltaic product to be tested is placed in a preset position. When the photovoltaic product to be tested is detected to be placed in the preset position, the lifting mechanism, under the control of the controller, causes the top cover to descend and engage with the frame.

12. The test fixture for photovoltaic products according to claim 11, characterized in that, On the opposite side of the hinge, magnetic assemblies are also provided on the frame and the top cover respectively.

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