Vacuum adsorption device and test system of back contact solar cell

Abstract

The utility model provides a vacuum adsorption device of a back contact solar cell and a test system, and relates to the field of photovoltaic technology. The utility model provides a vacuum adsorption device of a back contact solar cell. The vacuum adsorption device comprises a first light-transmitting plate; the second light-transmitting plate is located below the first light-transmitting plate in the thickness direction of the vacuum adsorption device, and a hollow cavity is formed between the second light-transmitting plate and the first light-transmitting plate; the vacuum generation assembly communicates with the hollow cavity and is used for forming negative pressure in the hollow cavity; wherein the second light-transmitting plate is provided with a plurality of vacuum adsorption holes, and the vacuum adsorption holes are communicated with the hollow cavity so as to adsorb the back contact solar cell when the hollow cavity has negative pressure. Through the vacuum adsorption device provided by the invention, the back contact solar cell can not be shielded by the air pipe in the detection process, so that the accuracy of IV test and EL detection is remarkably improved.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and in particular to a vacuum adsorption device and testing system for back-contact solar cells. Background Technology

[0002] During the production and testing process of back contact (BC) solar cells, it is necessary to rely on a testing system to perform current and voltage (IV) tests and electroluminescence (EL) tests.

[0003] Traditional testing systems mainly consist of a vacuum adsorption device, a light source, and a probe assembly. Due to the limitations of the structural design of the vacuum adsorption device, light source, and probe assembly, existing testing systems suffer from the following drawbacks:

[0004] (1) Measurement error caused by light path obstruction. Vacuum adsorption devices, as the fixing mechanism for batteries, generally use a structure design with a through hole in a quartz glass plate to connect a vacuum tube. The negative pressure generated by the vacuum tube adsorbs the battery onto the quartz glass plate. The vacuum tube can easily physically obstruct the light-receiving surface of the battery. This obstruction directly reduces the incident light intensity, resulting in poor measurement accuracy of photoelectric parameters in IV testing. On the other hand, it forms interfering image residues during EL testing, obscuring the true morphology of internal defects in the battery cell and severely restricting the accuracy of defect detection.

[0005] (2) Risk of poor contact caused by back-side adsorption. For example, Chinese utility model patent CN214756249U places a probe inside a portion of the vacuum suction hole and protrudes 0.1-2 mm from the surface of the test backplate (i.e., quartz glass plate). The back of the battery is adsorbed onto the test backplate and comes into contact with the probe. Due to the height of the probe and the electrode on the back of the battery, a gap can easily form between the back of the battery and the test backplate, which reduces the adsorption force of the test backplate on the battery cell during the test, resulting in poor contact.

[0006] (3) The light source is not arranged properly. For example, in Chinese utility model patent CN216873163U, after the battery cell is fixed in the IV test device, the light source is located below the battery cell, which makes it easy to be dazzled by the light generated by the light source when observing manually. Utility Model Content

[0007] This application provides a vacuum adsorption device and testing system for back-contact solar cells, aiming to solve at least one technical problem existing in the prior art.

[0008] The first aspect of this application provides a vacuum adsorption device for a back-contact solar cell, comprising: a first light-transmitting plate; a second light-transmitting plate located below the first light-transmitting plate along the thickness direction of the vacuum adsorption device, with a hollow cavity formed between the second light-transmitting plate and the first light-transmitting plate; and a vacuum generating component connected to the hollow cavity for creating a negative pressure within the hollow cavity; wherein the second light-transmitting plate has a plurality of vacuum adsorption holes connected to the hollow cavity to adsorb the back-contact solar cell when the hollow cavity has a negative pressure.

[0009] In some embodiments, the first light-transmitting plate includes a main body and a protrusion; the protrusion is arranged around the outer edge of the side of the main body facing the second light-transmitting plate and is connected to the second light-transmitting plate along the thickness direction to form a hollow cavity.

[0010] In some embodiments, an annular light-transmitting pad is also included; the annular light-transmitting pad is disposed between the first light-transmitting plate and the second light-transmitting plate along the thickness direction, and is connected to the first light-transmitting plate and the second light-transmitting plate respectively, so as to jointly form a hollow cavity.

[0011] In some embodiments, the back-contact solar cell has a light-receiving surface and a back-lighting surface disposed opposite to the light-receiving surface. When the back-contact solar cell is adsorbed by a plurality of vacuum adsorption holes, the light-receiving surface contacts the side of the second light-transmitting plate that is away from the first light-transmitting plate.

[0012] In some embodiments, the vacuum generating assembly includes a quick-connect gas path connector and a vacuum pump; the vacuum pump is connected to the quick-connect gas path connector; the quick-connect gas path connector is connected to a first light-transmitting plate or a second light-transmitting plate and is connected to a hollow cavity.

[0013] In some embodiments, the first or second light-transmitting plate has a mounting through hole along its thickness direction; the mounting through hole communicates with the hollow cavity and is used to install a quick-connect gas connector.

[0014] In some embodiments, the projection of the gas quick-connect connector along the thickness direction is located outside the back contact solar cell.

[0015] In some embodiments, the projected area of ​​the hollow cavity along the thickness direction is larger than the projected area of ​​the back contact solar cell along the thickness direction; the projected edge of the mounting through hole along the thickness direction is located on the hollow cavity and close to the edge of the hollow cavity.

[0016] In some embodiments, the side of the second light-transmitting plate facing away from the first light-transmitting plate is provided with an adsorption region, and a plurality of vacuum adsorption holes are spaced apart in the adsorption region; the projection of the adsorption region along the thickness direction is located on the hollow cavity; the area of ​​the adsorption region is greater than or equal to the projected area of ​​the back-contact solar cell along the thickness direction.

[0017] In some embodiments, the materials of the first and second light-transmitting plates are selected from at least one of quartz glass and polycarbonate materials.

[0018] In some embodiments, the material of the annular light-transmitting gasket is selected from at least one of nylon, acrylic, and polycarbonate.

[0019] A second aspect of this application provides a testing system for a back-contact solar cell, comprising: a vacuum adsorption device for upward adsorption of the back-contact solar cell; a light source disposed above the vacuum adsorption device; and a probe group disposed below the back-contact solar cell; wherein the vacuum adsorption device is as described above, the back-contact solar cell is disposed between the vacuum adsorption device and the probe group, the back-contact solar cell has a light-receiving surface and a back-lighting surface disposed opposite to the light-receiving surface, wherein the light-receiving surface contacts the vacuum adsorption device, and the back-lighting surface contacts the probe group to complete the test.

[0020] Through the structural design of the vacuum adsorption device, the second light-transmitting plate is arranged below the first light-transmitting plate along the thickness direction of the vacuum adsorption device, and a hollow cavity is formed between the two plates. Several vacuum adsorption holes communicating with the hollow cavity are opened on the second light-transmitting plate. The vacuum generating component can communicate with the hollow cavity to form a negative pressure in the hollow cavity during the detection process, so that the vacuum adsorption holes can use the negative pressure to directly adsorb the back contact solar cell at the bottom of the second light-transmitting plate.

[0021] Compared with the prior art, the vacuum adsorption device and testing system for back-contact solar cells provided in this application have at least the following advantages:

[0022] (1) During the detection of back-contact solar cells, the incident light can be directly transmitted through the first light-transmitting plate through the hollow cavity and the second light-transmitting plate to the surface of the back-contact solar cells. There is no obstruction of the light path by the vacuum tube, which avoids the reduction of the incident light intensity on the light-receiving surface of the cell and improves the measurement accuracy of IV test. At the same time, during EL test, the shadow formed by the vacuum tube in the EL test image is avoided, which improves the accuracy of defect detection.

[0023] (2) The front side of a back-contact solar cell is typically textured, specifically a nanoscale pyramid-like structure, while the height of the positive and negative electrodes on the back side is typically at the micrometer level. Therefore, when the probe is vacuum-adsorbed onto the front side of the back-contact solar cell, the gap between the vacuum adsorption device and the back-contact solar cell is much smaller than when it is adsorbed onto the back side of the back-contact solar cell. In other words, negative pressure is easier and more stable to achieve, resulting in more stable contact between the probe assembly and the back-contact solar cell, thus improving the accuracy of detection.

[0024] (3) Placing the light source above the back-contact solar cell avoids eye damage to the testers during testing. In addition, on the production line, placing the back-contact solar cells face up is usually more in line with the working conditions of the processes before testing, eliminating the need for flipping. This not only saves time but also avoids damage to the back-contact solar cells caused by flipping.

[0025] Other features and advantages of the vacuum adsorption device and testing system for back-contact solar cells provided in this application will be described in detail in the following specific embodiments. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application; those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0027] Figure 1 This is an overall schematic diagram of the vacuum adsorption device provided according to the embodiments of this application;

[0028] Figure 2 A side view of the vacuum adsorption apparatus provided according to an embodiment of this application;

[0029] Figure 3 This is a side cross-sectional schematic diagram of the vacuum adsorption device provided according to an embodiment of this application;

[0030] Figure 4 This is a partial schematic diagram of the side cross-section of the vacuum adsorption device provided according to an embodiment of this application;

[0031] Figure 5 An exploded view of the vacuum adsorption device provided according to an embodiment of this application;

[0032] Figure 6 A perspective view of the vacuum adsorption apparatus provided according to an embodiment of this application;

[0033] Figure 7 An exploded view of a vacuum adsorption apparatus according to another embodiment of this application;

[0034] Figure 8 This is a side view of a vacuum adsorption apparatus provided according to another embodiment of this application;

[0035] Figure 9 This is a side cross-sectional schematic diagram of a vacuum adsorption device according to another embodiment of this application;

[0036] Figure 10This is a schematic diagram of the modules of a test system provided according to an embodiment of this application.

[0037] The attached figures are labeled as follows:

[0038] 100. Vacuum adsorption device;

[0039] 10. First light-transmitting plate; 11. Main body; 12. Protrusion; 13. Mounting through hole;

[0040] 20. Second light-transmitting plate; 21. Vacuum adsorption hole;

[0041] 30. Vacuum generating assembly; 31. Quick-connect gas line connector;

[0042] 40. Back-contact solar cell; 41. Back surface; 42. Light-receiving surface;

[0043] 50. Circular translucent gasket;

[0044] 1000. Test system;

[0045] 200, Light source; 300, Probe assembly;

[0046] R, hollow cavity; D, adsorption region; H, thickness direction. Detailed Implementation

[0047] To make the above and other features and advantages of this application clearer, the present invention will be further described below with reference to the accompanying drawings. It should be understood that the specific embodiments given herein are for the purpose of explanation to those skilled in the art and are exemplary only, not restrictive.

[0048] Furthermore, features specified with "first" or "second" for descriptive purposes only should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Features specified with "first" or "second" may explicitly or implicitly include at least one of the specified features. The description of "multiple" generally means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] It should be noted that the thickness direction H in the embodiments of this application is the thickness direction of the main structure of the vacuum adsorption device 100, that is, it can be the thickness direction of the first light-transmitting plate 10 or the second light-transmitting plate 20.

[0050] As mentioned above, in order to avoid the physical obstruction of the light-receiving surface of the battery by the air pipe of the vacuum adsorption device in the prior art, which would affect the accuracy of IV testing or EL detection, the general concept of the embodiments of this application is to eliminate the air pipe structure arranged on the top during the detection of the back contact solar cell 40. Instead, the hollow cavity R formed between the first light-transmitting plate 10 and the second light-transmitting plate 20 and the vacuum adsorption hole 21 connected thereto are used to generate negative pressure to adsorb the back contact solar cell 40. This avoids the physical obstruction caused by the air pipe arranged on the top of the back contact solar cell 40, thereby increasing the light energy of the light-receiving surface of the battery during IV testing and avoiding the formation of air pipe shadows in the EL detection image, thus improving the accuracy of defect judgment.

[0051] Based on the above concept, and referring to Figures 1-6 As shown, Figure 1 This is an overall schematic diagram of the vacuum adsorption device 100 provided according to an embodiment of this application; Figure 2 A side view of the vacuum adsorption device 100 provided according to an embodiment of this application; Figure 3 This is a side cross-sectional view of the vacuum adsorption device 100 provided according to an embodiment of this application; Figure 4 This is a partial schematic diagram of a side cross-section of the vacuum adsorption device 100 provided according to an embodiment of this application; Figure 5 An exploded view of the vacuum adsorption device 100 provided according to an embodiment of this application; Figure 6 This is a perspective view of the vacuum adsorption device 100 provided according to an embodiment of this application.

[0052] This application provides a vacuum adsorption device 100 for a back-contact solar cell 40, comprising: a first light-transmitting plate 10; a second light-transmitting plate 20 located below the first light-transmitting plate 10 along the thickness direction H of the vacuum adsorption device 100, with a hollow cavity R formed between the second light-transmitting plate 20 and the first light-transmitting plate 10; and a vacuum generating component 30 connected to the hollow cavity R for creating a negative pressure within the hollow cavity R; wherein the second light-transmitting plate 20 has a plurality of vacuum adsorption holes 21 connected to the hollow cavity R to adsorb the back-contact solar cell 40 when the hollow cavity R has a negative pressure.

[0053] It should be noted that the vacuum adsorption device 100 of this application is suitable for an atmospheric pressure environment, so that when a negative pressure is formed in the hollow cavity R, the bottom of the second light-transmitting plate 20 can adsorb the back contact solar cell 40 through the vacuum adsorption hole 21. In IV testing or EL detection, light passes through the first light-transmitting plate 10, the hollow cavity R, and the second light-transmitting plate 20 in sequence along the thickness direction H to irradiate the back contact solar cell 40 for corresponding detection.

[0054] In this embodiment, the hollow cavity R is formed along the thickness direction H between the first light-transmitting plate 10 and the second light-transmitting plate 20, and communicates with the vacuum adsorption holes 21 opened on the second light-transmitting plate 20. Specifically, the hollow cavity R can be formed by connecting the first light-transmitting plate 10 and the second light-transmitting plate 20 along the thickness direction H. For example, either the first light-transmitting plate 10 or the second light-transmitting plate 20 has a relatively recessed portion on the side facing the other along the thickness direction H, so that the two together form the hollow cavity R after being connected along the thickness direction. The hollow cavity R can communicate with a plurality of vacuum adsorption holes 21 opened on the second light-transmitting plate 20, so that when the hollow cavity R forms a negative pressure, the vacuum adsorption holes 21 also have a negative pressure, thereby adsorbing the back contact solar cell 40 to the bottom of the second light-transmitting plate 20.

[0055] In addition, in this embodiment, a plurality of vacuum adsorption holes 21 are formed on the second light-transmitting plate 20. The number of vacuum adsorption holes 21 can be 2, 3 or more than 4. The arrangement of the plurality of vacuum adsorption holes 21 is not limited, as long as they are completely blocked by the back contact solar cell 40 during adsorption.

[0056] In some embodiments, the diameter of the vacuum adsorption hole 21 is 0.5-6 mm. For example, the diameter of the vacuum adsorption hole 21 can be any diameter value within the range of 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm or 0.5-6 mm to ensure effective transmission of negative pressure and stable adsorption of the battery.

[0057] It should be noted that the vacuum adsorption hole 21 is only used as a path to transfer the negative pressure inside the hollow cavity R to the back contact solar cell 40, and is not used as a space to accommodate other components, so as to avoid affecting the adsorption stability of the back contact solar cell 40.

[0058] refer to Figure 3 and Figure 4 As shown, in some embodiments, the first light-transmitting plate 10 includes a main body 11 and a protrusion 12; the protrusion 12 is arranged around the outer edge of the side of the main body 11 facing the second light-transmitting plate 20, and is connected to the second light-transmitting plate 20 along the thickness direction H to form a hollow cavity R.

[0059] That is, the aforementioned recessed portion is designed on the first light-transmitting plate 10 and is surrounded by the protrusion 12 on the main body 11. Both sides of the second light-transmitting plate 20 along the thickness direction can be flat. The protrusion 12 is connected to the top of the second light-transmitting plate 20 along the thickness direction H, thereby forming a hollow cavity R between the first light-transmitting plate 10 and the second light-transmitting plate 20. Of course, in embodiments not shown, the aforementioned recessed portion can also be designed on the second light-transmitting plate 20 with the same concept, and the vacuum adsorption holes 21 are all opened in the recessed portion. Both sides of the first light-transmitting plate 10 along the thickness direction can be flat, and the aforementioned hollow cavity R can also be formed.

[0060] Continue to refer to Figure 2 and Figure 5 As shown, in some embodiments, the back-contact solar cell 40 has a light-receiving surface 42 and a back-lighting surface 41 disposed opposite to the light-receiving surface 42. When the back-contact solar cell 40 is adsorbed by the plurality of vacuum adsorption holes 21, the light-receiving surface 42 contacts the side of the second light-transmitting plate 20 that is away from the first light-transmitting plate 10. It should be understood that the front side of the back-contact solar cell 40 is usually textured, specifically it can be a nanoscale pyramid-like structure, and the positive and negative electrodes of the cell are cross-distributed on the back side of the cell, the height of the positive and negative electrodes on the back side is usually at the micrometer level.

[0061] The aforementioned light-receiving surface 42 is the front side of the back-contact solar cell 40. The front side of the back-contact solar cell 40 has no grid line design, and the positive and negative electrodes of the cell are cross-distributed on the back side of the cell (i.e., the backlight side). By contacting the light-receiving surface 42 with the side of the second light-transmitting plate 20 that is away from the first light-transmitting plate 10, the light-receiving surface 42 is adsorbed at the bottom of the second light-transmitting plate 20. This makes the gap between the vacuum adsorption device 100 and the back-contact solar cell 40 much smaller than the case where it is adsorbed on the back side of the back-contact solar cell 40. Compared with the backlight side 41 being contacted and adsorbed by the second light-transmitting plate 20, the negative pressure is easier and more stable to achieve. It can avoid insufficient adsorption on the backlight side 41 due to the height of the positive and negative electrodes, thereby avoiding poor contact during IV testing and improving the accuracy of the test. In addition, the light-receiving surface 42 contacts the side of the second light-transmitting plate 20 that is away from the first light-transmitting plate 10, and the back contact solar cell 40 faces upward. In actual production, this is more in line with the working conditions of the process before testing. The back contact solar cell 40 does not need to be flipped before being adsorbed by the vacuum adsorption device 100, which not only saves time but also avoids damage to the back contact solar cell 40 caused by flipping.

[0062] refer to Figures 1-5Considering the formation of a negative pressure environment within the hollow cavity R and the vacuum adsorption hole 21, in some embodiments, the vacuum generating component 30 includes a gas path quick connector 31 and a vacuum pump (not shown); the vacuum pump is connected to the gas path quick connector 31; the gas path quick connector 31 is connected to the first light-transmitting plate 10 or the second light-transmitting plate 20, and is connected to the hollow cavity R.

[0063] It is understood that the vacuum generating component 30 in this embodiment is responsible for creating the required negative pressure environment within the hollow cavity R. It mainly comprises two parts: a quick-connect gas line connector 31 and a vacuum pump. The vacuum pump and the quick-connect gas line connector 31 can be connected via a gas pipe, and the quick-connect gas line connector 31 can be connected to the first light-transmitting plate 10 (e.g., ...). Figures 1-5 As shown in the figure, it can also be connected to the second light-transmitting plate 20 (not shown), ensuring that the quick-connect gas path connector 31 is connected to the hollow cavity R. When the vacuum pump is started, the vacuum pump extracts the air from the quick-connect gas path connector 31 connected to the hollow cavity R. As the air is extracted, the air pressure in the hollow cavity R will gradually decrease, thus forming a negative pressure environment. At this time, the vacuum adsorption hole 21 on the second light-transmitting plate 20 will also be affected by the negative pressure, thereby generating an adsorption force on the back contact solar cell 40.

[0064] refer to Figure 5 As shown, in some embodiments, when the quick-connect gas connector 31 is connected to the first light-transmitting plate 10, the first light-transmitting plate 10 has a mounting through hole 13 along the thickness direction H. The mounting through hole 13 communicates with the hollow cavity R to install the quick-connect gas connector 31, thereby enabling the quick-connect gas connector 31 to communicate with the hollow cavity R. Of course, in other embodiments not shown, the mounting through hole 13 can also be formed along the thickness direction H on the second light-transmitting plate 20, both of which can achieve the fixation of the quick-connect gas connector 31 and the communication with the hollow cavity R.

[0065] It should be understood that the connection between the quick-connect fitting 31 and the mounting through hole 13 can be either screwed or snap-fit, as long as the airtightness requirement is met.

[0066] To avoid obstruction of the back contact of the quick-connect fitting 31 with the top of the solar cell 40, please refer to... Figure 2 As shown, in some embodiments, the projection of the quick-connect gas path connector 31 along the thickness direction H is located outside the back contact solar cell 40. This design ensures that during detection, when light shines along the thickness direction H, the shadow cast by the quick-connect gas path connector 31 does not fall on the back contact solar cell 40, thereby avoiding a reduction in the light energy on the back contact solar cell 40 and preventing shadows from forming in the EL detection image, thus improving detection accuracy.

[0067] Continue to refer to Figure 3As shown, in some embodiments, the projected area of ​​the hollow cavity R along the thickness direction H is larger than the projected area of ​​the back contact solar cell 40 along the thickness direction H. The projected edge of the mounting through hole 13 along the thickness direction H is located on the hollow cavity R and close to the edge of the hollow cavity R. By making the projected area of ​​the hollow cavity R along the thickness direction H larger than the projected area of ​​the back contact solar cell 40 along the thickness direction H, and the projected area of ​​the mounting through hole 13 along the thickness direction H close to the edge of the hollow cavity R, that is, the projected area of ​​the mounting through hole 13 along the thickness direction H can be located outside the back contact solar cell 40, so that after the quick-connect fitting 31 is connected to the mounting through hole 13, the quick-connect fitting 31 will not block the light from the top of the back contact solar cell 40.

[0068] refer to Figure 6 As shown, in some embodiments, the second light-transmitting plate 20 has an adsorption region D on the side facing away from the first light-transmitting plate 10, and a plurality of vacuum adsorption holes 21 are spaced apart in the adsorption region D; the projection of the adsorption region D along the thickness direction H is located on the hollow cavity R; the area of ​​the adsorption region D is greater than or equal to the projected area of ​​the back-contact solar cell 40 along the thickness direction H.

[0069] The adsorption region D at the bottom of the second light-transmitting plate 20 is a plane, and multiple vacuum adsorption holes 21 are distributed at intervals within the adsorption region D. The projection of the adsorption region D along the thickness direction H is located on the hollow cavity R, so that the vacuum adsorption holes 21 are connected to the hollow cavity R. The area of ​​the adsorption region D is greater than or equal to the projected area of ​​the back contact solar cell 40 along the thickness direction H. The light-receiving surface 42 of the back contact solar cell 40 is completely located within the adsorption region D during adsorption, so as to ensure the stable adsorption of the back contact solar cell 40.

[0070] Considering the diversity of hollow cavity R formation, refer to Figures 7-9 As shown, Figure 7 An exploded view of a vacuum adsorption device 100 provided according to another embodiment of this application; Figure 8 A side view of a vacuum adsorption apparatus 100 provided according to another embodiment of this application; Figure 9 This is a side cross-sectional view of a vacuum adsorption device 100 provided according to another embodiment of this application.

[0071] Another embodiment of the present application provides a vacuum adsorption device 100, which further includes an annular light-transmitting pad 50; the annular light-transmitting pad 50 is disposed between the first light-transmitting plate 10 and the second light-transmitting plate 20 along the thickness direction H, and is connected to the first light-transmitting plate 10 and the second light-transmitting plate 20 respectively, so as to jointly form a hollow cavity R.

[0072] In this embodiment, the first light-transmitting plate 10 and the second light-transmitting plate 20 can both be light-transmitting plates with flat surfaces on both sides along the thickness direction H (i.e., without the aforementioned recessed portion). The annular light-transmitting gasket 50 has a certain thickness. The two sides of the annular light-transmitting gasket 50 along the thickness direction H are respectively connected to the first light-transmitting plate 10 and the second light-transmitting plate 20 to form a seal, thereby making the annular light-transmitting gasket 50, the first light-transmitting plate 10 and the second light-transmitting plate 20 together form a hollow cavity R.

[0073] Compared to designing the above-mentioned recessed portion in the first light-transmitting plate 10 or the second light-transmitting plate 20 to form a hollow cavity R, this embodiment uses an annular light-transmitting pad 50 to connect the first light-transmitting plate 10 and the second light-transmitting plate 20 to jointly form a hollow cavity R, which is more conducive to adjusting the thickness of the hollow cavity R to adapt to different space occupancy requirements of the vacuum adsorption device 100.

[0074] In some embodiments, the materials of the first light-transmitting plate 10 and the second light-transmitting plate 20 are selected from at least one of quartz glass and polycarbonate materials to ensure structural strength while allowing light to pass through and irradiate the back contact solar cell 40, thereby reducing light energy loss. Of course, the materials of the first light-transmitting plate 10 and the second light-transmitting plate 20 can also be selected from other high light-transmitting materials with similar strength, which will not be listed here.

[0075] In some embodiments, the material of the annular light-transmitting pad 50 is selected from nylon, acrylic or polycarbonate to ensure structural strength while reducing the attenuation of light energy when light passes through; similar to the material selection of the first light-transmitting plate 10 and the second light-transmitting plate 20, the material of the annular light-transmitting pad 50 can also be selected from other high light-transmitting materials with similar strength, which will not be listed here.

[0076] Continue to refer to Figure 10 As shown, Figure 10 This is a schematic diagram of the modules of the test system 1000 provided according to an embodiment of this application.

[0077] Another embodiment of this application provides a testing system 1000 for a back-contact solar cell 40, comprising: a vacuum adsorption device 100 for upward adsorption of the back-contact solar cell 40; a light source 200 disposed above the vacuum adsorption device 100; and a probe group 300 disposed below the back-contact solar cell 40. The vacuum adsorption device 100 is the same as in any of the above embodiments. The back-contact solar cell 40 is disposed between the vacuum adsorption device 100 and the probe group 300. The back-contact solar cell 40 has a light-receiving surface 42 and a back-lighting surface 41 disposed opposite to the light-receiving surface 42. The light-receiving surface 42 contacts the vacuum adsorption device 100, and the back-lighting surface 41 contacts the probe group 300 to complete the test.

[0078] During the test, the back-contact solar cell 40 is placed at the bottom of the vacuum adsorption device 100 and stably adsorbed onto the bottom of the second light-transmitting plate 20 through the vacuum adsorption hole 21. After the light source 200 is turned on, it simulates sunlight. The generated light passes through the first light-transmitting plate 10, the hollow cavity R, and the second light-transmitting plate 20 sequentially along the thickness direction H and then illuminates the light-receiving surface 42 of the back-contact solar cell 40. At the same time, the probe group 300 contacts the back-lighting surface 41 of the back-contact solar cell 40 to establish an electrical connection, thereby completing the test. It should be noted that in this embodiment, the light source 200 is positioned above the vacuum adsorption device 100, that is, above the first light-transmitting plate 10. This allows the light generated by the light source 200 to pass through the first light-transmitting plate 10, the hollow cavity R, and the second light-transmitting plate 20 sequentially along the thickness direction H before illuminating the light-receiving surface of the back-contact solar cell 40. Compared to placing the light source 200 below the vacuum adsorption device 100, this avoids glare and is more beneficial to the health of the operator.

[0079] In summary, the design of the vacuum adsorption device 100 in this embodiment ensures that the light path is not obstructed by the vacuum tube during the inspection of the back-contact solar cell 40, thereby preventing a reduction in the incident light intensity on the light-receiving surface 42 of the cell and improving the measurement accuracy of IV testing. Simultaneously, during EL testing, it avoids shadows in the EL detection image caused by the vacuum tube, thus improving the accuracy of defect detection. Secondly, when vacuum adsorbed onto the front of the back-contact solar cell 40, the gap between the vacuum adsorption device 100 and the back-contact solar cell 40 is much smaller than when adsorbed onto the back of the back-contact solar cell 40; that is, negative pressure is easier and more stable to achieve, resulting in more stable contact between the probe group 300 and the back-contact solar cell 40, improving the accuracy of detection. Furthermore, the way the light source 200 is positioned above the back-contact solar cell 40 avoids eye damage to the tester during testing; moreover, on the production line, the placement of the back-contact solar cell face up is generally more in line with the conditions of the processes before testing, eliminating the need for flipping, saving time and avoiding damage to the back-contact solar cell caused by flipping.

[0080] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A vacuum suction device (100) for back contact solar cells, characterized in that, The back contact solar cell vacuum suction device (100) comprises: a first light-transmitting plate (10); a second light-transmitting plate (20) located below the first light-transmitting plate (10) along a thickness direction (H) of the vacuum suction device (100), and a hollow cavity (R) being formed between the first light-transmitting plate (10) and the second light-transmitting plate (20); a vacuum generating assembly (30) in communication with the hollow cavity (R) and configured to form a negative pressure in the hollow cavity (R); wherein a plurality of vacuum suction holes (21) are formed in the second light-transmitting plate (20) and in communication with the hollow cavity (R) so as to suction the back contact solar cell (40) when the hollow cavity (R) has the negative pressure.

2. The vacuum chucking apparatus (100) for back contact solar cells according to claim 1, characterized in that The first light-transmitting plate (10) comprises a main body portion (11) and a protruding portion (12); the protruding portion (12) is annularly arranged at an outer edge of a surface of the main body portion (11) facing the second light-transmitting plate (20) and is connected with the second light-transmitting plate (20) along the thickness direction (H) so as to enclose the hollow cavity (R).

3. The back contact solar cell vacuum suction device (100) according to claim 1, further comprising: an annular light-transmitting gasket (50); the annular light-transmitting gasket (50) is arranged between the first light-transmitting plate (10) and the second light-transmitting plate (20) along the thickness direction (H) and is connected with the first light-transmitting plate (10) and the second light-transmitting plate (20) respectively so as to jointly enclose the hollow cavity (R).

4. The vacuum chucking apparatus (100) for back contact solar cells according to claim 1, characterized in that The back contact solar cell (40) has a light-receiving surface (42) and a back light surface (41) arranged opposite to the light-receiving surface (42), and when the back contact solar cell (40) is suctioned by the plurality of vacuum suction holes (21), the light-receiving surface (42) is in contact with a surface of the second light-transmitting plate (20) which is away from the first light-transmitting plate (10).

5. The vacuum chucking apparatus (100) for back contact solar cells according to claim 2 or 3, characterized in that The vacuum generating assembly (30) comprises a gas path quick connector (31) and a vacuum pump; the vacuum pump is in communication with the gas path quick connector (31); the gas path quick connector (31) is connected with the first light-transmitting plate (10) or the second light-transmitting plate (20) and is in communication with the hollow cavity (R).

6. The back contact solar cell vacuum suction device (100) according to claim 5, wherein: the first light-transmitting plate (10) or the second light-transmitting plate (20) is provided with a mounting through hole (13) along the thickness direction (H); the mounting through hole (13) is in communication with the hollow cavity (R) and is configured to mount the gas path quick connector (31).

7. The back contact solar cell vacuum suction device (100) according to claim 5, wherein: a projection of the gas path quick connector (31) along the thickness direction (H) is located outside the back contact solar cell (40).

8. The back contact solar cell vacuum suction device (100) according to claim 6, wherein: The projection area of the hollow cavity (R) along the thickness direction (H) is greater than the projection area of the back contact solar cell (40) along the thickness direction (H); The projection of the mounting through hole (13) along the thickness direction (H) is located on the hollow cavity (R) and close to the edge of the hollow cavity (R).

9. The vacuum suction device (100) of the back contact solar cell according to claim 2 or 3, characterized in that, The second light transmission plate (20) is provided with a suction area (D) on the side away from the first light transmission plate (10), and a plurality of vacuum suction holes (21) are arranged in the suction area (D) at intervals; The projection of the suction area (D) along the thickness direction (H) is located on the hollow cavity (R); The area of the suction area (D) is greater than or equal to the projection area of the back contact solar cell (40) along the thickness direction (H).

10. The vacuum chucking apparatus (100) for back contact solar cells according to claim 1, characterized in that The materials of the first light transmission plate (10) and the second light transmission plate (20) are selected from quartz glass or polycarbonate material.

11. The vacuum chucking apparatus (100) for back contact solar cells according to claim 3, characterized in that The material of the annular light transmission gasket (50) is selected from nylon, acrylic or polycarbonate material.

12. A test system (1000) of a back contact solar cell, characterized in that, Comprising: A vacuum suction device (100) for suctioning the back contact solar cell (40) upwards; A light source (200) arranged above the vacuum suction device (100); A probe group (300) arranged below the back contact solar cell (40); Wherein, the vacuum suction device (100) is as claimed in any one of claims 1-11, the back contact solar cell (40) is arranged between the vacuum suction device (100) and the probe group (300), the back contact solar cell (40) has a light receiving surface (42) and a back light surface (41) arranged opposite to the light receiving surface (42), wherein the light receiving surface (42) is in contact with the vacuum suction device (100), and the back light surface (41) is in contact with the probe group (300) to complete the test.

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