IV-EL test device

Abstract

The application relates to an IV-EL testing device, and belongs to the technical field of solar energy. The IV-EL testing device comprises an upper pressing plate, a light source simulator, an EL camera and a probe assembly. The upper pressing plate comprises a bottom surface, a top surface and an outer peripheral surface, is provided with a ventilation pipeline, is provided with a blowing hole in the bottom surface, and is further provided with a connecting hole in the surface. The light source simulator is used for providing an analog light source to a battery piece in IV testing. The EL camera is used for shooting electroluminescence imaging of the battery piece in EL testing. The bottom surface is provided with a working area for abutting the battery piece, the blowing hole is arranged in the working area, and the projection of the connecting hole does not coincide with the projection of the working area in the thickness direction of the upper pressing plate. The IV-EL testing device improves the shielding phenomenon of the device related to the blowing function on the light receiving area and the developing phenomenon on the EL camera imaging, thereby having high IV testing precision and EL testing precision, and improving the reliability of performance evaluation of the BC battery.

Description

Technical Field

[0001] This application relates to the field of solar energy technology, and more specifically, to an IV-EL testing device. Background Technology

[0002] BC cells, also known as full back contact cells, have both positive and negative electrodes located on the back of the cell, eliminating the shading loss of the front grid lines. They can absorb more sunlight and have higher light absorption and conversion efficiency, giving them a significant competitive advantage in the photovoltaic market.

[0003] The manufacturing process of BC cells requires IV and EL testing. In IV testing, a light source is applied to the front of the cell, and the voltage applied to the cell is changed to measure the corresponding current, resulting in an IV characteristic curve that visually reflects the performance and quality of the cell. In EL testing, a voltage is applied to the back of the cell to make it emit light, and an EL camera is used to capture and record defects such as microcracks in the cell, thus evaluating the quality of the cell and the production yield.

[0004] Current IV-EL testing equipment includes a glass upper plate with an opening extending through its thickness. An external air blowing tube extends into this opening and blows air onto the solar cell after testing, assisting in the cell's detachment from the upper plate and facilitating smooth cell unloading. However, because the air blowing tube inevitably obstructs the light-receiving area and is reflected in the EL image, this interference significantly impacts the accuracy of both IV and EL testing. This is particularly true for BC cells, which have a larger light-receiving area; the interference from the air blowing tube severely affects their performance evaluation. Utility Model Content

[0005] To address this, this application proposes an IV-EL testing device that reduces the shading of the light-receiving area by the air-blowing function-related devices and improves the development phenomenon of the air-blowing function-related devices in EL camera imaging, thereby achieving higher IV testing accuracy and EL testing accuracy, and improving the reliability of BC battery performance evaluation.

[0006] Some embodiments of the IV-EL testing apparatus of this application include: an upper pressure plate, including a bottom surface, a top surface, and an outer peripheral surface; the upper pressure plate is provided with a ventilation pipe; the bottom surface is provided with an air blowing hole, which communicates with the ventilation pipe and is used to blow air onto the solar cell; the surface of the upper pressure plate is also provided with a connection hole communicating with the ventilation pipe and used to connect to an external air blowing device; a light source simulator, used to provide a simulated light source to the solar cell during IV testing; an EL camera, used to capture electroluminescence images of the solar cell during EL testing; and a probe assembly, used to apply voltage to the solar cell; wherein, the bottom surface is provided with a working area for contacting the solar cell, the air blowing hole is disposed in the working area, and in the thickness direction of the upper pressure plate, the projection of the connection hole does not coincide with the projection of the working area.

[0007] Optionally, the connecting hole is disposed on the outer peripheral surface of the upper pressure plate.

[0008] Optionally, the connection hole is located at the edge of the top surface.

[0009] Optionally, the ventilation duct extends from the air inlet in a direction away from the working area.

[0010] Optionally, the cross-section of the ventilation duct is circular or elliptical.

[0011] Optionally, multiple ventilation pipes and multiple air blowing holes are provided, with each air blowing hole corresponding to a ventilation pipe, and each air blowing hole communicating with the corresponding ventilation pipe; wherein, the multiple ventilation pipes are arranged symmetrically with respect to the center of the upper pressure plate, and the multiple air blowing holes are arranged symmetrically with respect to the center of the upper pressure plate.

[0012] Optionally, four ventilation pipes and four air blowing holes are provided, with each air blowing hole corresponding to a ventilation pipe, and each air blowing hole connected to the corresponding ventilation pipe; wherein, the working area is square, and the four air blowing holes are respectively located at the four corners of the working area.

[0013] Optionally, four connection holes are provided, each connection hole is corresponding to one of the ventilation pipes, and each connection hole is connected to the corresponding ventilation pipe. The outer peripheral surface includes two opposing first side surfaces, wherein two connection holes are provided on one of the first side surfaces and the other two connection holes are provided on the other first side surface.

[0014] Optionally, the light transmittance of the upper pressure plate is D, where D ≥ 90%.

[0015] Optionally, the light source simulator is disposed on the upper side of the upper pressure plate, and the EL camera is disposed on the oblique upper side of the upper pressure plate. In the thickness direction of the upper pressure plate, the projection of the EL camera does not coincide with the projection of the working area.

[0016] Compared with existing technologies, this solution has the following advantages:

[0017] In the IV-EL testing device of this application embodiment, the projection of the connecting hole and the working area in the thickness direction of the upper pressure plate does not coincide. The connection between the ventilation pipe and the connecting hole will not block the light-receiving area of ​​the battery cell, nor will it be captured into the image by the EL camera. This reduces the interference of the ventilation pipe on the actual light-receiving area of ​​the battery cell and EL imaging, thereby achieving higher IV testing accuracy and EL testing accuracy, and improving the reliability of the performance evaluation of BC batteries.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. 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 the IV-EL testing device provided in the embodiments of this application;

[0021] Figure 2 This is a schematic diagram of the upper pressure plate of a first form of the IV-EL testing device provided in the embodiments of this application;

[0022] Figure 3 A first-view cross-sectional view of the upper pressure plate of a second form of the IV-EL testing device provided in the embodiments of this application;

[0023] Figure 4 This is a schematic diagram of the upper pressure plate of a second type of IV-EL testing device provided in the embodiments of this application;

[0024] Figure 5 A cross-sectional view of the upper pressure plate of a third form of the IV-EL testing device provided in the embodiments of this application.

[0025] Icons: 100-IV-EL testing device; 110-Upper pressure plate; 111-Bottom surface; 112-Top surface; 1121-Light-receiving area; 1122-Edge area; 113-Outer peripheral surface; 1131-First side surface; 1132-Second side surface; 114-Ventilation pipe; 114a-First ventilation pipe; 115-Blowing hole; 115a-First blowing hole; 116-Connecting hole; 116a-First connecting hole; 117-Working area; 118-Flow equalization chamber; 1181-Flow equalization hole; 120-Light source simulator; 130-EL camera; 140-Probe assembly; 200-Battery cell. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] In related technologies, the upper plate of the IV-EL testing device is usually a glass plate with an opening. An external air blowing pipe extends into the opening from the top, and an external feeding mechanism pushes the solar cells upward so that the solar cells are in contact with the bottom surface of the upper plate. After the test is completed, the feeding mechanism descends, and the air blowing pipe blows air onto the upper surface of the solar cells, causing the solar cells to separate from the upper plate and fall onto the feeding mechanism, thus achieving smooth unloading.

[0029] The inventors discovered through research that in IV testing, the air blower obstructs the view of the solar cell, causing the actual light-receiving area of ​​the cell to be smaller than the theoretical area, resulting in a significant deviation in the calculated output of IV electrical performance. In EL testing, the air blower is simultaneously captured in the EL image by the EL camera. Due to the interference of the air blower on the image of that area, it is impossible to accurately determine whether there are defects in the area obstructed by the air blower, leading to missed and false EL assessments, resulting in poor EL accuracy.

[0030] Based on the above ideas, this application proposes an IV-EL device that improves the occlusion phenomenon of the light-receiving area by the device related to the blowing function and the development phenomenon in EL camera imaging, thereby achieving higher IV test accuracy and EL test accuracy, and improving the reliability of BC battery performance evaluation.

[0031] like Figure 1 and Figure 2 As shown, the IV-EL testing apparatus 100 of some embodiments of this application includes an upper pressure plate 110, a light source simulator 120, an EL camera 130, and a probe assembly 140. The upper pressure plate 110 includes a bottom surface 111, a top surface 112, and an outer peripheral surface 113. The upper pressure plate 110 is provided with a ventilation pipe 114, and the bottom surface 111 is provided with an air blowing hole 115, which communicates with the ventilation pipe 114 and is used to blow air onto the solar cell 200. The surface of the upper pressure plate 110 is also provided with a connection hole 116 communicating with the ventilation pipe 114, which is used to connect to an external air blowing device. The light source simulator 120 is used to provide a simulated light source to the solar cell 200 in the IV test. The EL camera 130 is used to capture electroluminescent images of the solar cell 200 in the EL test. The probe assembly 140 is used to apply voltage to the solar cell 200. The bottom surface 111 is provided with a working area 117 for bonding with the battery cell 200, and an air blowing hole 115 is provided in the working area 117. In the thickness direction of the upper pressure plate 110, the projection of the connecting hole 116 does not coincide with the projection of the working area 117.

[0032] The upper pressure plate 110 extends along the first direction X in the length direction, along the second direction Y in the width direction, and along the vertical direction Z in the thickness direction. The first direction X and the second direction Y are two mutually perpendicular horizontal directions.

[0033] The projection of the upper pressure plate 110 in the thickness direction is the projection on the XY plane. The projection of the connecting hole 116 on the XY plane does not coincide with the projection of the working area 117 on the XY plane. The connecting hole 116 can be set on the outer peripheral surface 113 or on the edge of the top surface 112.

[0034] In the IV-EL testing device 100 of this application embodiment, the projections of the connecting hole 116 and the working area 117 on the thickness direction of the upper pressure plate 110 do not coincide. This ensures that the connection between the ventilation pipe 114 and the connecting hole 116 does not block the light-receiving area of ​​the battery cell 200, nor is it simultaneously captured into the image by the EL camera 130. This reduces the interference of the ventilation pipe 114 on the actual light-receiving area of ​​the battery cell 200 and EL imaging, thereby achieving higher IV testing accuracy and EL testing accuracy, and improving the reliability of BC battery performance evaluation.

[0035] like Figure 1 and Figure 2 As shown, in some embodiments of this application, the connection hole 116 is disposed on the outer peripheral surface 113 of the upper pressure plate 110.

[0036] The outer peripheral surface 113 includes two first side surfaces 1131 arranged opposite each other along the first direction X and two second side surfaces 1132 arranged opposite each other along the second direction Y. The connecting hole 116 can be provided on the first side surface 1131 or the second side surface 1132.

[0037] With this configuration, the external air blowing device is connected to the air duct 114 from the outer peripheral surface 113 of the upper pressure plate 110. The air duct 114 is connected to the connection hole 116 on the outside of the working area 117. The connection between the air duct 114 and the connection hole 116 will not block the light-receiving area of ​​the battery cell 200, nor will it be simultaneously captured into the image by the EL camera 130.

[0038] like Figure 3 and Figure 4 As shown, in some other embodiments of this application, the connection hole 116 is provided at the edge of the top surface 112.

[0039] The top surface 112 is a light-receiving surface, including an effective light-receiving area 1121 corresponding to the working area 117 on the XY plane and an edge area 1122 outside the light-receiving area 1121. The connecting hole 116 is disposed in the edge area 1122.

[0040] With this configuration, the external air blowing device is connected to the air duct 114 from the edge of the top surface 112 of the upper pressure plate 110. The air duct 114 is connected to the connection hole 116 on the outside of the working area 117. The connection between the air duct 114 and the connection hole 116 will not block the light-receiving area of ​​the battery cell 200, nor will it be simultaneously captured into the image by the EL camera 130.

[0041] like Figure 1 and Figure 2 As shown, in some embodiments of this application, the ventilation duct 114 extends from the air inlet 115 in a direction away from the working area 117.

[0042] That is, one end of the ventilation pipe 114 is connected to the air blowing hole 115, and the side of the air blowing hole 115 that is closer to the outer peripheral surface 113 is provided with a corresponding connecting hole 116. The ventilation pipe 114 bends and extends in the direction of the corresponding connecting hole 116 until it is connected to the connecting hole 116.

[0043] This configuration reduces the projected area of ​​the ventilation duct 114 on the upper side of the working area 117, thereby reducing interference with the test results and improving the accuracy of IV and EL tests.

[0044] like Figure 5As shown, in some other embodiments of this application, the upper pressure plate 110 has a flow equalization cavity 118 inside. The projection of the working area 117 on the XY plane will fall into the projection of the flow equalization cavity 118 on the XY plane. One end of the air pipe 114 is connected to the connection hole 116, and the other end leads to the flow equalization cavity 118 through the flow equalization hole 1181. The flow equalization cavity 118 is connected to all the air blowing holes 115.

[0045] The projection of the flow equalization orifice 1181 onto the XY plane does not coincide with the working area 117. In other words, the flow equalization orifice 1181 is located on the inner peripheral wall of the flow equalization cavity 118, or on the edge of the inner top wall.

[0046] With this configuration, the projections of the ventilation duct 114 and the working area 117 can be completely non-overlapping, thereby completely preventing the ventilation duct 114 from blocking the light-receiving area of ​​the battery cell 200 or from being simultaneously captured into the image by the EL camera 130, significantly improving the testing accuracy of the IV-EL testing device 100.

[0047] In some embodiments of this application, the cross-section of the ventilation duct 114 is circular or elliptical.

[0048] This configuration reduces airflow resistance, minimizes eddies and turbulence, and ensures uniform airflow. Furthermore, the circular or elliptical shape of the pipe allows for uniform stress distribution, resulting in better structural stability and reducing the risk of breakage or deformation of the upper pressure plate 110 under high pressure or complex stress.

[0049] like Figure 2 As shown, in some embodiments of this application, multiple ventilation pipes 114 and multiple air blowing holes 115 are provided. Each air blowing hole 115 is provided in a one-to-one correspondence with a ventilation pipe 114, and each air blowing hole 115 is connected to the corresponding ventilation pipe 114. The multiple ventilation pipes 114 are arranged symmetrically with respect to the center of the upper pressure plate 110, and the multiple air blowing holes 115 are arranged symmetrically with respect to the center of the upper pressure plate 110.

[0050] With this configuration, the solar cell 200 can be blown evenly, and the solar cell 200 can be subjected to uniform force when it is separated from the upper pressure plate 110, so that it can be separated from the upper pressure plate 110 smoothly.

[0051] In other embodiments, a ventilation duct 114 may also be connected to multiple air inlets 115 simultaneously.

[0052] like Figure 2As shown, there are four ventilation pipes 114 and four air blowing holes 115. The air blowing holes 115 are arranged in a one-to-one correspondence with the ventilation pipes 114, and each air blowing hole 115 is connected to the corresponding ventilation pipe 114. The working area 117 is square, and the four air blowing holes 115 are respectively arranged at the four corners of the working area 117.

[0053] This arrangement allows the four air holes 115 to be spaced as far apart as possible, blowing air towards the edge of the battery cell 200 and improving the smoothness of the separation between the battery cell 200 and the upper pressure plate 110.

[0054] There are four connection holes 116, and each connection hole 116 is configured to correspond to a ventilation pipe 114. Each connection hole 116 is connected to the corresponding ventilation pipe 114. The outer peripheral surface 113 includes two opposing first side surfaces 1131, of which two connection holes 116 are configured on one of the first side surfaces 1131 and the other two connection holes 116 are configured on the other first side surface 1131.

[0055] Specifically, each air inlet 115 is connected to the nearest connection port 116 via a shorter path. For example, the first air inlet 115a is connected to the nearest first connection port 116a via a first air duct 114a.

[0056] With this arrangement, the connection holes 116 can be set on the two opposite first sides 1131, occupying the installation space on both sides of the upper pressure plate 110 along the first direction X to arrange the air blowing device, thereby leaving the installation space on both sides of the upper pressure plate 110 along the first direction Y to arrange other devices, thus achieving a reasonable arrangement of the installation space around the IV-EL device 100.

[0057] In some embodiments of this application, the light transmittance of the upper pressure plate 110 is D, where D ≥ 90%.

[0058] For example, the upper pressure plate 110 is made of light-transmitting materials such as polymethyl methacrylate or quartz glass.

[0059] This configuration ensures that the light source shines through the upper pressure plate 110 onto the surface of the solar cell 200, guaranteeing that the solar cell 200 effectively receives the light source and ensuring the accuracy of the IV test.

[0060] like Figure 1 As shown, in some embodiments of this application, the light source simulator 120 is disposed on the upper side of the upper pressure plate 110, and the EL camera 130 is disposed on the oblique upper side of the upper pressure plate 110. In the thickness direction of the upper pressure plate 110, the projection of the EL camera 130 does not coincide with the projection of the working area 117.

[0061] In other words, the projection of the EL camera 130 onto the XY plane does not coincide with the working area 117.

[0062] This configuration avoids the EL camera 130 from blocking the light-receiving area of ​​the battery cell 200, and the light source emitted by the light source simulator 120 can be fully projected onto the battery cell 200, thus achieving higher IV test accuracy.

[0063] The probe assembly 140 is located on the lower side of the upper pressure plate 110, so it will not block the light-receiving area of ​​the battery cell 200, nor will it be captured into the image by the EL camera 130, thus it will not interfere with the IV test data and EL test data.

[0064] In the IV-EL testing device 100 of this application embodiment, the connection hole 116 is disposed on the edge of the outer peripheral surface 113 or the top surface 112 of the upper pressure plate 110. The projection of the connection hole 116 does not coincide with the projection of the working area 117 in the thickness direction of the upper pressure plate 110. The EL camera 130 is disposed obliquely above the upper pressure plate 110, and the projection of the EL camera 130 in the XY plane does not coincide with the working area 117. Therefore, the connection between the ventilation pipe 114 and the connection hole 116 will not block the light-receiving area of ​​the battery cell 200, nor will it be simultaneously captured by the EL camera 130. This will not interfere with the actual light-receiving area of ​​the battery cell 200 or the EL imaging, thereby achieving high IV testing accuracy and EL testing accuracy, and improving the reliability of the performance evaluation of BC batteries.

[0065] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0066] 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. An IV-EL testing device (100), characterized in that, include: The upper pressure plate (110) includes a bottom surface (111), a top surface (112), and an outer peripheral surface (113). The upper pressure plate (110) is provided with a ventilation pipe (114). The bottom surface (111) is provided with an air blowing hole (115). The air blowing hole (115) is connected to the ventilation pipe (114) and is used to blow air onto the battery cells. The surface of the upper pressure plate (110) is also provided with a connection hole (116) connected to the ventilation pipe (114). The connection hole (116) is used to connect to an external air blowing device. A light source simulator (120) is used to provide a simulated light source to the solar cells during IV testing; An EL camera (130) is used to capture electroluminescent images of battery cells during EL testing; A probe assembly (140) is used to apply voltage to the solar cell; The bottom surface (111) is provided with a working area (117) for bonding with the battery cell, and the air blowing hole (115) is provided in the working area (117). In the thickness direction of the upper pressure plate (110), the projection of the connecting hole (116) does not coincide with the projection of the working area (117).

2. The IV-EL test device (100) according to claim 1, characterized in that The connecting hole (116) is provided on the outer peripheral surface (113) of the upper pressure plate (110).

3. The IV-EL test device (100) according to claim 1, characterized in that The connecting hole (116) is located at the edge of the top surface (112).

4. The IV-EL test device (100) according to claim 1, characterized in that The ventilation duct (114) extends from the air inlet (115) in a direction away from the working area (117).

5. The IV-EL test device (100) according to claim 1, characterized in that The cross-section of the ventilation duct (114) is circular or elliptical.

6. The IV-EL test device (100) according to claim 1, characterized in that The ventilation pipe (114) is provided in multiple ways, and the air blowing hole (115) is provided in multiple ways. The air blowing hole (115) is provided in a one-to-one correspondence with the ventilation pipe (114), and each air blowing hole (115) is connected to the corresponding ventilation pipe (114). The plurality of ventilation pipes (114) are arranged symmetrically with respect to the upper pressure plate (110), and the plurality of air holes (115) are arranged symmetrically with respect to the upper pressure plate (110).

7. The IV-EL test device (100) according to claim 6, characterized in that The ventilation pipe (114) is provided with four, and the air blowing hole (115) is provided with four. The air blowing hole (115) is provided in a one-to-one correspondence with the ventilation pipe (114), and each air blowing hole (115) is connected to the corresponding ventilation pipe (114). The working area (117) is square, and the four air holes (115) are respectively located at the four corners of the working area (117).

8. The IV-EL test device (100) according to claim 7, characterized in that The connecting hole (116) is provided in four parts, and the connecting hole (116) is provided in a one-to-one correspondence with the ventilation pipe (114). Each connecting hole (116) is connected to the corresponding ventilation pipe (114). The outer peripheral surface (113) includes two opposing first side surfaces (1131), wherein two of the connecting holes (116) are provided on one of the first side surfaces (1131), and the other two connecting holes (116) are provided on the other first side surface (1131).

9. The IV-EL test device (100) according to claim 1, characterized in that The light transmittance of the upper pressure plate (110) is D, where D ≥ 90%.

10. The IV-EL test device (100) according to claim 1, characterized in that The light source simulator (120) is disposed on the upper side of the upper platen (110), and the EL camera (130) is disposed on the obliquely upper side of the upper platen (110). In the thickness direction of the upper platen (110), the projection of the EL camera (130) does not coincide with the projection of the work area (117).

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