Battery piece PL detection device

Abstract

The utility model provides a battery piece PL detection device, relates to the technical field of photovoltaic detection, and can solve the technical problem of low PL detection efficiency in the prior art. The battery piece PL detection device provided by the embodiment of the utility model comprises an area-array camera, an area light source group and a baffle plate mechanism, wherein the area-array camera is arranged above a target object and is used for acquiring an image of the target object; the area light source group is arranged below the target object and is used for emitting light to irradiate the target object; the baffle mechanism is arranged between the target object and the area light source set and used for controlling light of the area light source set to irradiate the area on the target object. Wherein the baffle plate mechanism comprises a baffle plate, and the baffle plate is movable, so that the area range of the light irradiated on the target object is variable.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic testing technology, and in particular to a photovoltaic cell PL testing device. Background Technology

[0002] Currently, the detection of internal defects in finished solar cells mainly relies on EL (electroluminescence) and PL (photoluminescence) image processing. As the photovoltaic industry's requirements for cell efficiency and yield continue to increase, traditional EL is facing the following challenges: (1) EL imaging is affected by probe lifespan and probes need to be replaced regularly; (2) The pressure on the probe pressing level must be consistent, otherwise it will affect EL imaging; (3) Probe pressing and opening takes time, affecting production line CT; (4) Defects in the probe row obstructed position are hidden; (5) Probe pressing has the risk of damaging the cell; (6) Probe row maintenance and abnormal replacement are time-consuming and labor-intensive, affecting production line capacity; (7) Residual paste on the probe row leads to a high misjudgment rate.

[0003] Compared to traditional EL (electroluminescence), PL (photoluminescence) offers numerous advantages, including non-contact, non-destructive testing and the ability to inspect process sheets. Existing technology provides a PL detection module that intermittently blocks the solar cell, causing gaps in the PL-excited area. This results in lateral carrier movement between the excited and unexcited areas, preventing carrier transfer at the broken grid points, leading to localized carrier accumulation and an abnormally bright area in the PL image. Since the partially blocked PL image is incomplete, a high-resolution image of the broken grid is obtained by moving the baffle, taking two photos, and then stitching the images together. This allows PL detection to completely cover the function of EL and essentially replace it. However, this method requires multiple photos and image processing to obtain a complete PL image, resulting in low detection efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a solar cell PL detection device to solve the technical problem of low PL detection efficiency in the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] This utility model provides a battery cell PL testing device, comprising:

[0007] An area scan camera, positioned above the target object, is used to acquire images of the target object;

[0008] A surface light source group is positioned below the target object to emit light to illuminate the target object;

[0009] A baffle mechanism is disposed between the target object and the surface light source group, and is used to control the area on the target object illuminated by the light from the surface light source group;

[0010] The baffle mechanism includes a baffle that is movable, such that the area of ​​light illuminating the target is variable.

[0011] Furthermore, the baffle mechanism also includes a frame, and a first hollow area is formed in the middle of the frame;

[0012] The baffle includes a plurality of first baffles, which are horizontally and movably arranged on the first hollow area of ​​the frame in the same plane.

[0013] Furthermore, the movement direction of the plurality of first baffles is perpendicular to their own extension direction.

[0014] Furthermore, the frame has first slide rails on opposite sides of the first hollow area, and the two ends of the plurality of first baffles are slidably connected to opposite first slide rails.

[0015] Furthermore, the baffle also includes a plurality of second baffles, which are movably arranged in the same plane on the first hollow area of ​​the frame and are correspondingly located below the first baffle.

[0016] Furthermore, on the opposite sides of the first hollow area within the frame, second slide rails are respectively provided, and the two ends of the plurality of second baffles are respectively slidably connected to the opposite second slide rails.

[0017] Furthermore, the second baffle is arranged parallel to the first baffle.

[0018] Furthermore, it also includes a detection platform, which comprises:

[0019] A base on which the surface light source assembly is mounted;

[0020] At least one pair of side panels, the pair of side panels being arranged opposite to each other and respectively mounted on both sides of the base;

[0021] A platform, which is movably connected between a pair of side panels, has a hollow area in the middle of the platform, and the baffle mechanism is disposed on the platform and located above the hollow area;

[0022] At least one pair of first moving mechanisms, the pair of first moving mechanisms being disposed opposite each other on one side of the base, for driving the base to move along a first direction;

[0023] At least one pair of second moving mechanisms, the pair of second moving mechanisms being disposed opposite each other on the other side of the base, for driving the base to move in a second direction;

[0024] Wherein, the first direction is perpendicular to the second direction;

[0025] The baffle mechanism is horizontally movable along the second direction to the platform.

[0026] Furthermore, the solar cell PL testing device also includes a solar cell conveying platform, which is located between the area scan camera and the baffle mechanism.

[0027] The battery cell transfer platform includes:

[0028] The base frame has a second hollow area formed in the middle.

[0029] Furthermore, the base frame has internal air passages.

[0030] The battery cell transfer platform also includes at least one pair of suction cups, which are disposed opposite each other inside the second hollow area and connected to the inner sidewall of the base frame. The suction cups are connected to the air passage.

[0031] This invention provides a solar cell PL (Plastic Photon) inspection device. During inspection, a surface light source group at the bottom emits a beam of light upwards. After being blocked by a baffle mechanism, the beam illuminates a predetermined position on the solar cell (e.g., the main grid position). This causes lateral movement of charge carriers between the excited area (the beam-illuminated area) and the unexcited area (the non-beam-illuminated area) of the solar cell, resulting in the diffusion of charge carriers from the high-concentration area (beam-illuminated area) to the low-concentration area (non-beam-illuminated area). A top-mounted area array camera then captures an image of the solar cell after the beam illumination. The image displayed, except for the beam-illuminated area, is consistent with the EL (Elastic Photon) inspection image, achieving full PL inspection of the solar cell. In this embodiment, the solar cell PL inspection device only requires a single pre-adjustment of the baffle in the baffle mechanism to achieve spatial complementarity between the area of ​​illumination and the area to be inspected on the solar cell. Therefore, a single image capture by the area array camera is sufficient for full inspection of the solar cell, effectively improving PL inspection efficiency.

[0032] The above and other objects, advantages and features of this utility model will become more apparent to those skilled in the art from the following detailed description of specific embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0033] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale.

[0034] In the attached image:

[0035] Figure 1 This is a perspective structural diagram of the battery cell PL detection device according to an embodiment of the present invention;

[0036] Figure 2 for Figure 1 View A in the middle;

[0037] Figure 3 This is an assembly diagram of the battery cell conveying platform and baffle mechanism in the battery cell PL testing device of this utility model embodiment;

[0038] Figure 4 This is a schematic diagram of the baffle mechanism in the battery cell PL testing device according to an embodiment of the present invention;

[0039] Figure 5 for Figure 4 Enlarged schematic diagram of region a in the diagram;

[0040] Figure 6 for Figure 4 The view in direction b;

[0041] Figure 7 This is a schematic diagram of the structure of the battery cell conveying platform in the battery cell PL testing device according to an embodiment of the present invention;

[0042] Figure 8 This is a schematic diagram of the baffle mechanism blocking the light source according to an embodiment of the present utility model;

[0043] Figure 9 This is a schematic diagram of an EL imaging technique for detecting broken grid defects.

[0044] Figure 10 This is an imaging schematic diagram of the battery cell PL detection device for detecting grid breakage defects according to an embodiment of the present invention;

[0045] Figure 11 This is a schematic diagram of an EL imaging technique for detecting hazy blackening defects.

[0046] Figure 12 This is an imaging schematic diagram of the battery cell PL inspection device used in this embodiment of the present invention to detect hazy blackening defects.

[0047] Explanation of reference numerals in the attached figures:

[0048] Area array camera - 100; Battery cell transfer platform - 200; Second hollow area - 210; Base frame - 220; Suction cup - 230; Baffle mechanism - 300; Frame - 310; First baffle - 320; First slide rail - 330; Second baffle - 340; Second slide rail - 350; Surface light source group - 400; Beam - 410; Detection platform - 500; Base - 510; Side plate - 520; Stage - 530; Hollow area - 531; First moving mechanism - 540; Second moving mechanism - 550; Battery cell - 600. Detailed Implementation

[0049] In the description of this embodiment, it should be understood that the terms "length", "width", "height", "up", "down", "left", "right", "vertical", "horizontal", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and 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 utility model.

[0050] As a specific embodiment of this utility model, such as Figure 1 , Figure 2 as well as Figure 3 As shown, this utility model provides a battery cell PL (Plastic Photon) inspection device, which may include an area scan camera 100, an area light source group 400, and a baffle mechanism 300. The area scan camera 100 is positioned above the target object to acquire an image of the target object. The area light source group 400 is positioned below the target object to emit light to illuminate it. The baffle mechanism 300 is positioned between the target object and the area light source group 400 to control the area of ​​the target object illuminated by the light from the area light source group 400. The baffle mechanism 300 includes a baffle that is movable, allowing the range of the area of ​​light illuminating the target object to be variable.

[0051] Specifically, in the PL detection device for battery cells according to this embodiment, during detection, the surface light source group 400 at the bottom emits a light beam upwards. The baffle mechanism 300 adjusts and moves in advance according to the irradiation area of ​​the target object. After being blocked by the baffle, the light beam irradiates a predetermined position on the target object (e.g., the main grid position of the battery cell 600). As a result, lateral movement of charge carriers occurs between the excited area (i.e., the beam irradiation area) and the unexcited area (i.e., the non-beam irradiation area) of the battery cell 600, resulting in the diffusion of charge carriers from the high concentration area (beam irradiation area) to the low concentration area (non-beam irradiation area). The area array camera 100 at the top captures an image of the battery cell 600 after it has been irradiated by the light beam. The image obtained is consistent with the EL detection image except for the beam irradiation area, thus achieving full PL inspection of the battery cell. In this embodiment of the battery cell PL inspection device, during inspection, only a single pre-movement adjustment of the baffle in the baffle mechanism 300 is needed to achieve a spatially complementary relationship between the area of ​​light illuminating the target object and the area to be inspected on the battery cell. Furthermore, a single image capture by the area scan camera 100 is sufficient to complete the inspection of the entire battery cell 600, effectively improving inspection efficiency. In addition, there are no obstructions between the area scan camera 100 and the battery cell 600, ensuring image quality.

[0052] In other words, the battery cell PL inspection device of this utility model, through the design of the area array camera 100, the baffle mechanism 300 and the area light source group 400 arranged sequentially from top to bottom, uses optical excitation to simulate the recombination behavior of EL carriers, and realizes non-contact high-speed full inspection; and during inspection, it can simulate the effect of the forward bias voltage of EL detection, so that the appearance of the PL inspection result image in terms of defect location and morphology is consistent with the EL detection image, that is, defect identification is consistent with EL by simulating the EL imaging effect.

[0053] In some embodiments, the baffle mechanism 300 may further include a frame 310, with a first hollow area formed in the middle of the frame. The baffle may include a plurality of first baffles 320, which are horizontally movably arranged on the first hollow area of ​​the frame 310 in the same plane. Preferably, the moving direction of the plurality of first baffles 320 is perpendicular to their own extending direction.

[0054] As an example, such as Figure 4 and Figure 5As shown, the baffle mechanism 300 of this embodiment may include a frame 310 and a plurality of first baffles 320 spaced apart on a first hollow area in the middle of the frame 310. A single first baffle 320 is positioned along the X-axis, and the plurality of first baffles 320 are spaced apart along the Y-axis, with each first baffle 320 individually movable and adjustable along the Y-axis. By adjusting the position of the plurality of first baffles 320 in the middle of the frame 310, the beam emitted by the surface light source group 400 is blocked in the area to be excited by the battery cell, offering high flexibility and a wide range of applications.

[0055] In some embodiments, first slide rails 330 are formed on opposite sides of the first hollow area within the frame 310, and the two ends of a plurality of first baffles 320 are slidably connected to a pair of first slide rails 330.

[0056] Specifically, such as Figure 4 , Figure 5 and Figure 6 As shown, first slide rails 330 are formed on both sides of the first hollow area in the frame 310 along the Y direction. The first slide rail 330 can be, for example, a strip groove. The two ends of a plurality of first baffles 320 are slidably connected in a pair of strip grooves. The two ends of the first baffles 320 can be detachably connected to the strip grooves by bolts to achieve the positioning of the two ends of the first baffles 320 in the first slide rails 330.

[0057] In some embodiments, the baffle may further include a plurality of second baffles 340, which are movably arranged in the same plane on the first hollow area of ​​the frame 310 and correspondingly disposed below the first baffle 320. Preferably, the moving direction of the plurality of second baffles 340 is perpendicular to their own extending direction.

[0058] As an example, such as Figure 4 and Figure 5 As shown, below the first baffle 320 in the first hollow area of ​​the frame 310, a plurality of second baffles 340 are correspondingly arranged, and the plurality of second baffles 340 cooperate one-to-one with the upper first baffle 320. For example, by adjusting the relative positions between adjacent upper and lower first baffles 320 and second baffles 340, that is, by adjusting the spacing between the plurality of upper first baffles 320 and the spacing between the plurality of lower second baffles 340, or the overlap width between corresponding upper and lower single first baffles 320 and single second baffles 340, the area of ​​light emitted by the baffle mechanism 300 blocking the light source group 400 can be adjusted and controlled, thereby realizing the irradiation and excitation of the predetermined position of the battery cell.

[0059] In some embodiments, second slide rails 350 are formed on the opposite sides of the first hollow area within the frame 310, and the two ends of the plurality of second baffles 340 are slidably connected to a pair of second slide rails 350.

[0060] As an example, such as Figure 4 , Figure 5 and Figure 6 As shown, in the first hollow area of ​​the frame 310, second slide rails 350 are formed inside a pair of first slide rails 330. The height of the second slide rails 350 is lower than that of the first slide rails 330. The second slide rails 350 can also be, for example, strip grooves. The two ends of a plurality of second baffles 340 are slidably connected to a pair of strip grooves. The two ends of the second baffles 340 can be detachably connected to the strip grooves by bolts to achieve positioning of the two ends of the second baffles 340 within the second slide rails 350.

[0061] In some embodiments, such as Figure 4 As shown, the second baffle 340 is arranged parallel to the first baffle 320.

[0062] In other words, the second baffle 340 and the first baffle 320 are arranged parallel to each other, so that when the second baffle 340 and the first baffle 320 move relative to each other, the area blocked is a rectangular area that can be accurately adjusted, thereby adapting to the grid structure design on the battery cell and blocking light in a predetermined area of ​​the battery cell.

[0063] As a specific example Figure 8 A schematic diagram of the baffle mechanism blocking the light source in this embodiment is shown. Specifically, the surface light source group 400 emits a light beam 410 upward. When the light beam 410 passes through the first hollow area of ​​the frame 310, the overlap between the corresponding first baffle 320 and second baffle 340 inside the frame 310 is adjusted, thereby adjusting the width of the light beam 410 blocked in each area. This allows for control and adjustment of the width of the light beam 410 passing through each area, so as to irradiate and excite the predetermined position of the battery cell 600.

[0064] In other words, the baffle mechanism of this application, through the adjustment of the blocking areas of the first baffle 320 and the second baffle 340, can be compatible with different sized solar cells and graphic designs, highly simulating the needs of EL testing or module-end solder strip adjustment in solar cell factories. Furthermore, the light source is limited by the first baffle 320 and the second baffle 340 to illuminate only the main grid area, enabling precise positioning of the excitation area.

[0065] It should be noted that multiple objects under test can be blocked by a single or multiple baffle mechanisms and their upper and lower baffles, so that the light source only covers a predetermined area of ​​the object under test. Furthermore, the upper and lower baffles can have perforated slots of fixed width to control the amount of light transmitted.

[0066] In some embodiments, such as Figure 1 and Figure 2 As shown, the solar cell PL testing device may further include a testing platform 500, which may include a base 510, at least a pair of side plates 520, and a stage 530. A surface light source assembly 400 is mounted on the base 510. The pair of side plates 520 are arranged opposite each other and are respectively mounted on both sides of the base 510. The stage 530 is vertically movably connected between the pair of side plates 520, and a hollow area is formed in the middle of the stage 530. A baffle mechanism 300 is disposed on the stage 530 and located above the hollow area.

[0067] Specifically, the detection platform 500 in this embodiment is provided with a base 510, on which a pair of side plates 520 are provided, and a platform 530 is connected between the pair of side plates 520. The baffle mechanism 300 is detachably mounted on the platform 530, and a surface light source assembly 400 is mounted on the base 510 below the platform 530. A hollow area 531 is formed in the middle region of the platform 530, allowing the surface light source assembly 400 on the base 510 to emit a beam of light upwards through the hollow area 531 to reach the baffle mechanism 300. In other words, by providing the detection platform 500, the surface light source assembly 400 and the baffle mechanism 300 can be conveniently and detachably mounted, and it can be ensured that the surface light source assembly 400 and the baffle mechanism 300 are positioned at predetermined positions in the vertical direction. Preferably, the light emission direction of the surface light source assembly 400 is perpendicular to the plane where the baffle mechanism 300 is located, ensuring that the light emission range is within the projected area of ​​the baffle mechanism 300.

[0068] The platform 530 is movably connected between a pair of side plates 520, for example, by sliding on a pair of side plates 520 via a slide rail. By adjusting the height of the platform 530, the baffle mechanism 300 can effectively block the light emitted by the surface light source group 400.

[0069] In some embodiments, the detection platform 500 may further include at least one pair of first moving mechanisms 540 and at least one pair of second moving mechanisms 550. The pair of first moving mechanisms 540 are disposed opposite each other on one side of the base 510 and are used to drive the base 510 to move along a first direction. The pair of second moving mechanisms 550 are disposed opposite each other on the other side of the base 510 and are used to drive the base 510 to move along a second direction. The first direction is perpendicular to the second direction.

[0070] Specifically, such as Figure 1 and Figure 2As shown, a pair of first moving mechanisms 540 and a pair of second moving mechanisms 550 are sequentially arranged in the front-rear direction (i.e., the positive Y-axis direction) of the base 510 of the detection platform 500. The pair of first moving mechanisms 540 can be located on the rear side of the bottom surface of the base 510, and the pair of second moving mechanisms 550 can be located on the front side of the bottom surface of the base 510. The first moving mechanism 540 drives the base 510 to move along the X-axis direction, and the second moving mechanism 550 drives the base 510 along the Y-axis direction, thereby realizing the position adjustment of the base 510 of the detection platform 500 in the XY plane.

[0071] During operation, the battery cell conveying platform 200 carries the battery cells and rotates them from the previous station to the PL detection station. Based on the battery cell positioning information transmitted, the PLC motor drives the first moving mechanism 540 and the second moving mechanism 550 to move, so that the relative positions of the surface light source group 400, the baffle mechanism 300 and the battery cell 600 are consistent. At this time, the baffle mechanism 300 can block the range of light emitted by the surface light source group 400 and turn on the surface light source group 400.

[0072] In some embodiments, such as Figure 1 and Figure 3 As shown, the baffle mechanism 300 is horizontally movably connected to the platform 510 along the second direction.

[0073] In other words, the baffle mechanism 300 is movably connected to the platform 510 along the Y direction, for example, by sliding the platform 510 via a slide rail. Thus, the baffle mechanism 300 can also ensure that the light emitted by the surface light source group 400 is blocked by adjusting its position in the Y direction, thereby improving the efficiency of adjustment.

[0074] In some embodiments, such as Figure 1 and Figure 7 As shown, the solar cell PL testing device also includes a solar cell conveying platform 200, which is located between the area scan camera 100 and the baffle mechanism 300. The solar cell conveying platform 200 is used to load the solar cells 600 and transfer them between the area scan camera 100 and the baffle mechanism 300 for irradiation and excitation testing.

[0075] The cell transfer platform 200 may include a base frame 220. A second hollow area 210 is formed in the middle of the base frame 220.

[0076] In other words, the battery cell conveying platform 200 of this embodiment is provided with a base frame 220, and a second hollow area 210 is formed in the middle part of the base frame 220 to hold the battery cells. The light emitted by the bottom surface light source group 400 passes through the baffle mechanism 300 and through the internal area of ​​the second hollow area 210 to illuminate the battery cell 600 upwards. Among them, one end of the base frame 220 (i.e., the side of the second hollow area 210) is formed with a connecting part for connecting the driving member.

[0077] In some embodiments, such as Figure 7 As shown, an air passage (not shown) is formed inside the base frame 220. The cell transfer platform 200 also includes at least a pair of suction cups 230, which are disposed opposite each other inside the second hollow area 210 and connected to the inner sidewall of the base frame 220. The suction cups 230 are connected to the air passage.

[0078] Specifically, an air passage is provided inside the structure of the base frame 220, and at least one pair of suction cups 230 are arranged opposite each other inside the second hollow area 210. They are respectively connected to the inner side wall of the base frame 220. On the one hand, they are used to mount the battery cells; on the other hand, the suction cups 230 are connected to the air passage inside the structure of the base frame 220. When air is drawn from the air passage, the battery cells mounted on the suction cups 230 are adsorbed, further ensuring that the battery cells are not easily displaced when mounted.

[0079] The following specific embodiments illustrate the defect detection of the battery cell PL testing device of this application.

[0080] Figure 9 and Figure 10 These are schematic diagrams of EL (Elastic Image Processing) detection of broken grid defects and PL (Plastic Image Processing) detection of broken grid defects, respectively. Figure 9 The black horizontal stripe in the middle represents the area where the probe contacts the solar cell during EL detection. When the probe is energized, a forward bias voltage is applied to the solar cell. Carrier movement occurs between the energized area (i.e., the probe contact area) and the non-energized area (the area between adjacent probe contact areas). The non-energized area is the bright white area in the figure. However, due to the grid breakage defect, the movement of carriers is hindered, and recombination in the corresponding area is reduced, resulting in a decrease in local luminescence in the non-energized area (the dark area in the non-energized area). Figure 10 The bright white horizontal stripe area is the area illuminated by the light source in PL detection, i.e., the excited area. The dark gray area (i.e., the area between adjacent bright white horizontal stripe areas) is the unexcited area. Similarly, lateral movement of charge carriers occurs between the excited and unexcited areas. The locally weaker (darker) parts in the dark gray area are the broken grid defects. In other words, the solar cell PL detection device of this application can simulate the EL carrier recombination process, and the identification of broken grid defects is consistent with EL detection.

[0081] Figure 11 and Figure 12 These are schematic diagrams illustrating the imaging of hazy blackening defects using EL (Elastic Optical) and PL (Plastic Photoelectric) methods, respectively. Similarly, Figure 11 The black area in the middle is the region of hazy blackening defect detected by EL. Figure 12The medium-dark gray area (excluding the central light gray area) is the region identified by PL (Plastic Photodetector) as having a hazy blackening defect. In other words, the solar cell PL detection device of this application identifies hazy blackening defects in a manner consistent with EL (Elastic Photodetector).

[0082] Furthermore, the solar cell PL testing device of this application can also identify electrical performance defects such as laser misfiring in a manner consistent with EL testing, which will not be elaborated further here.

[0083] Therefore, those skilled in the art should understand that although this document only illustrates and describes several embodiments of the present invention by way of example, other variations or modifications that conform to the principles of the present invention can still be made or implemented based on the disclosure of the present invention without departing from the scope defined by the claims. Therefore, the protection scope of the present invention should cover all such variations, modifications, and equivalent substitutions falling within the scope of the claims.

Claims

1. A solar cell PL testing device, characterized in that, include: An area scan camera, positioned above the target object, is used to acquire images of the target object; A surface light source group is positioned below the target object to emit light to illuminate the target object; A baffle mechanism is disposed between the target object and the surface light source group, and is used to control the area on the target object illuminated by the light from the surface light source group; The baffle mechanism includes a baffle that is movable, such that the area of ​​light illuminating the target is variable.

2. The solar cell PL testing device according to claim 1, characterized in that, The baffle mechanism also includes a frame, and a first hollow area is formed in the middle of the frame; The baffle includes a plurality of first baffles, which are horizontally and movably arranged on the first hollow area of ​​the frame in the same plane.

3. The solar cell PL testing device according to claim 2, characterized in that, The movement direction of the plurality of first baffles is perpendicular to their own extension direction.

4. The solar cell PL testing device according to claim 2, characterized in that, The frame has first slide rails on opposite sides of the first hollow area, and the two ends of the plurality of first baffles are slidably connected to opposite first slide rails.

5. The solar cell PL testing device according to claim 2, characterized in that, The baffle also includes multiple second baffles. Multiple second baffles are movably arranged on the first hollow area of ​​the frame in the same plane, and are correspondingly located below the first baffle.

6. The solar cell PL testing device according to claim 5, characterized in that, The frame is provided with second slide rails on the opposite sides of the first hollow area, and the two ends of the multiple second baffles are slidably connected to the opposite second slide rails.

7. The solar cell PL testing device according to claim 5, characterized in that, The second baffle is arranged parallel to the first baffle.

8. The solar cell PL testing device according to claim 1, characterized in that, It also includes a testing platform, which comprises: A base on which the surface light source assembly is mounted; At least one pair of side panels, the pair of side panels being arranged opposite to each other and respectively mounted on both sides of the base; A platform, which is movably connected between a pair of side panels, has a hollow area in the middle of the platform, and the baffle mechanism is disposed on the platform and located above the hollow area; At least one pair of first moving mechanisms, the pair of first moving mechanisms being disposed opposite each other on one side of the base, for driving the base to move along a first direction; At least one pair of second moving mechanisms, the pair of second moving mechanisms being disposed opposite each other on the other side of the base, for driving the base to move in a second direction; Wherein, the first direction is perpendicular to the second direction; The baffle mechanism is horizontally movable along the second direction to the platform.

9. The solar cell PL testing device according to claim 1, characterized in that, The solar cell PL testing device also includes a solar cell conveying platform, which is located between the area scan camera and the baffle mechanism. The battery cell transfer platform includes: The base frame has a second hollow area formed in the middle.

10. The solar cell PL testing device according to claim 9, characterized in that, The base frame has air passages inside. The battery cell transfer platform also includes at least one pair of suction cups, which are disposed opposite each other inside the second hollow area and connected to the inner sidewall of the base frame. The suction cups are connected to the air passage.

Images